CBT3251

1-of-8 FET multiplexer/demultiplexer
Rev. 5 — 18 April 2024

Product data sheet

1. General description
The CBT3251 is a single-pole, 8-throw bus switch. The device features an output enable input (OE)and three select inputs (S0, S1 and S2). When OE is LOW the switch is enabled and the selectinputs can be used to connect the A terminal to one of the eight B terminals.

2. Features and benefits
•
•
•
•
•
•
•

•

5 Ω switch connection between two ports
Direct interface with TTL levels
Overvoltage tolerant control inputs to 5.5 V
IOFF circuitry provides partial Power-down mode operation
Minimal propagation delay through the switch
Latch-up protection exceeds 100 mA per JEDEC standard JESD78 class II level A
ESD protection:• HBM: ANSI/ESDA/JEDEC JS-001 class 2 exceeds 2000 V• CDM: ANSI/ESDA/JEDEC JS-002 class C3 exceeds 1000 V
Specified from -40 °C to +85 °C

3. Ordering information
Table 1. Ordering information
Type number
Temperature range

Package
Name

Description

Version

CBT3251D-40 °C to +85 °C

SO16plastic small outline package; 16 leads;
body width 3.9 mm

SOT109-1

CBT3251PW-40 °C to +85 °C

TSSOP16

plastic thin shrink small outline package; 16 leads;
body width 4.4 mm

SOT403-1

CBT3251

Nexperia

1-of-8 FET multiplexer/demultiplexer

4. Functional diagram
A

5

4
3
2
1
15
14
13
12

OE
S0
S1
S2

Fig. 1.

B1
B2
B3
B4
B5
B6
B7
B8

7
11
10
9
002aab820

Logic diagram

5. Pinning information
5.1. Pinning
D package
SOT109-1 (SO16)
B4

1

16 VCC

B3

2

15 B5

B2

3

14 B6

B1
A
n.c.

4

13 B7

5

12 B8

6

11 S0

OE

7

10 S1

GND

8

9

S2

PW package
SOT403-1 (TSSOP16)B4

1

16 VCC

B3

2

15 B5

B2

3

14 B6

B1

4

13 B7

A

5

12 B8

n.c.

6

11 S0

OE

7

10 S1

GND

8

9

CBT3251

Product data sheet

S2

aaa-036382

aaa-036381

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1-of-8 FET multiplexer/demultiplexer

5.2. Pin description
Table 2. Pin description
SymbolPin

Description

B1, B2, B3, B4, B5, B6, B7, B8

1, 2, 3, 4, 12, 13, 14, 15

B outputs/inputs

A5

A input/output

n.c.

6

not connectedOE

7

output enable (active LOW)

S2, S1, S0

9, 10, 11select control input

GND

8ground (0 V)

VCC

16

positive supply voltage

6. Functional description
Table 3. Function selection
H = HIGH voltage level; L = LOW voltage level; X = Don’t care.
InputsSwitch

OE

S2

S1

S0

L

L

L

L

A to B1

L

L

L

H

A to B2

L

L

H

L

A to B3

L

L

H

H

A to B4

L

H

L

L

A to B5

L

H

L

H

A to B6

L

H

H

L

A to B7

L

H

H

H

A to B8

H

X

X

X

switch off

7. Limiting values
Table 4. Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134).
Symbol Parameter

Conditions

Min

Max

Unit

-0.5

+7.0

V

-0.5

+7.0

V

VCC

supply voltage

VI

input voltage

ISW

switch current

continuous current through each switch

-

128

mA

IIK

input clamping current

VI < 0 V

-50

-

mA

Tstg

storage temperature

-65

+150

°C

Ptot

total power dissipation

-

500

mW

[1]

[1]

Tamb = -40 °C to +85 °C

The input and output negative voltage ratings may be exceeded if the input and output clamp current ratings are observed.

CBT3251

Product data sheet

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1-of-8 FET multiplexer/demultiplexer

8. Recommended operating conditions
Table 5. Operating conditions
All unused control inputs of the device must be held at VCC or GND to ensure proper device operation.
Symbol Parameter

Conditions

Min

Max

Unit

VCC

supply voltage

4.5

5.5

V

VIH

HIGH-level input voltage

2.0

-

V

VIL

LOW-level input voltage

-

0.8

V

Tamb

ambient temperature

-40

+85

°C

operating in free-air

9. Static characteristics
Table 6. Static characteristics
Symbol Parameter

Conditions

VIK

input clamping voltage

VCC = 4.5 V; II = -18 mA

Vpass

pass voltage

VI = VCC = 5.0 V; IO = -100 μAII

input leakage current

ICC

Tamb = -40 °C to +85 °C.

Unit

Min

Typ

Max

-

-

-1.2

V

3.6

3.9

4.2

V

VCC = 5.5 V; VI = GND or 5.5 V

-

-

±1

μA

supply current

VCC = 5.5 V; IO = 0 mA; VI = VCC or GND

-

-

3

μA

ΔICC

additional supply current

per input; VCC = 5.5 V;
one input at 3.4 V,
other inputs at VCC or GND

[2]

-

-

2.5

mA

CI

input capacitancecontrol pins; VI = 3 V or 0 V

[1]

-

3.5

-

pF

Cio(off)

off-state input/output
capacitance

A port; VO = 3 V or 0 V; OE = VCC

[1]

-

17.5

-

pF

B port; VO = 3 V or 0 V; OE = VCC

[1]

-

4.0

-

pF

ON resistance

VCC = 4.5 V

[3]

RON

[1]
[2]
[3]

[1]

VI = 0 V; II = 64 mA

[1]

-

5

7

Ω

VI = 0 V; II = 30 mA

[1]

-

5

7

Ω

VI = 2.4 V; II = -15 mA

[1]

-

10

15

Ω

Typical value is measured at VCC = 5 V; Tamb = 25 °C.
This is the increase in supply current for each input that is at the specified TTL voltage level rather than VCC or GND.
Measured by the voltage drop between the A and the Bn terminals at the indicated current through the switch. The lowest voltage ofthe two (A or Bn) terminals determines the ON resistance.

CBT3251

Product data sheet

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1-of-8 FET multiplexer/demultiplexer

10. Dynamic characteristics
Table 7. Dynamic characteristics
VCC = 4.5 V to 5.5 V; for test circuit, see Fig. 4.
Symbol Parameter

Conditions

tpd

propagation delaytenenable time

tdis

[1]
[2]

disable time

Tamb = -40 °C to +85 °C
Min

Max

Unit

A to Bn or Bn to A; see Fig. 2[1] [2]

-

0.25

ns

Sn to A; see Fig. 2[1] [2]

1.5

5.5

ns

OE to A or Bn; see Fig. 3

[2]

1.5

5.6

ns

Sn to Bn; see Fig. 3

[2]

1.6

5.8

ns

OE to A or Bn; see Fig. 3

[2]

1.9

6.4

ns

Sn to Bn; see Fig. 3

[2]

2.3

6.2

ns

This parameter is warranted but not production tested. The propagation delay is based on the RC time constant of the typical ON
resistance of the switch and a load capacitance, when driven by an ideal voltage source (zero output impedance).
tPLH and tPHL are the same as tpd.
tPZL and tPZH are the same as ten.
tPLZ and tPHZ are the same as tdis.

10.1. Waveforms and test circuit
VI
input

VM

VM

0V
tPHL

tPLH

VOH
VM

outputVM

VOL

001aai367

Measurement points are given in Table 8.
VOL and VOH are typical voltage output levels that occur with the output load.
Fig. 2.

The input (A; Bn) to output (Bn; A) or input (Sn) to output (A) propagation delay times
VI
VM

OE, Sn input

VM

GND
tPZL

tPLZ
output
LOW-to-OFF
OFF-to-LOW

VCC
VM
VX

VOL

tPZH

tPHZ
VOH
output
HIGH-to-OFF
OFF-to-HIGH

VY
VM

GND
switchenabledswitchdisabled

switchenabled001aan455

Measurement points are given in Table 8.
VOL and VOH are typical voltage output levels that occur with the output load.
Fig. 3.

Enable and disable times

CBT3251

Product data sheet

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Nexperia

1-of-8 FET multiplexer/demultiplexer
Table 8. Measurement points
Supply voltage
Input

Output

VCC

VI

VM

VM

VX

VY

4.5 V to 5.5 V

GND to 3.0 V

1.5 V

1.5 V

VOL + 0.3 V

VOH - 0.3 V

VI
negative
pulse

tW
90 %
VM

0V

VI
positive
pulse
0V

VM

10 %
tf

tr

tr

tf
90 %
VM

VM

10 %
tW
VEXT
VCC
G

VI

RL

VO
DUT
RT

CL

RL

001aae331

Test data is given in Table 9.
Definitions for test circuit:
RL = Load resistance;
CL = Load capacitance including jig and probe capacitance;
RT = Termination resistance should be equal to the output impedance Zo of the pulse generator;
VEXT = External voltage for measuring switching times.
Fig. 4.

Test circuit for measuring switching times

Table 9. Test data
Supply voltage Input

Load

VEXT

VCC

VI

tr, tf

CL

RL

tPLH, tPHL

tPLZ, tPZL

tPHZ, tPZH

4.5 V to 5.5 V

GND to 3.0 V≤ 2.5 ns

50 pF

500 Ω

open

7.0 V

open

CBT3251

Product data sheet

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CBT3251

Nexperia

1-of-8 FET multiplexer/demultiplexer

11. Package outline
SO16: plastic small outline package; 16 leads; body width 3.9 mm

SOT109-1

D

E

A
X

c
y

HE

16

v M A

9

A2

A

A3

A1

pin 1 index
q
Lp
1

L

8
e

detail X

w M

bp

0

5 mm
scale

Dimensions (inch dimensions are derived from the original mm dimensions)
Unit

A

A1

max 1.75
nom
min

0.25

max 0.069
inches nom
min

0.010

mm

0.10

0.004

A2

1.25

0.049

A3
0.25

0.01

bp

c

D(1)

E(1)

0.51

0.25

10.0

4.0

0.31

0.10

9.8

3.8

0.020

0.010

0.394

0.16

0.012

0.004

0.386

0.15

e
1.27

0.05

HE

L

6.2

1.05

5.8
0.244
0.228

0.041

Lp
1.27
0.4
0.05
0.016

v

SOT109-1

Fig. 5.

References
IEC

JEDEC

JEITA

y

θ

0.2

0.25

0.1

0.008

0.01

0.004

Note
1. Plastic or metal protrusions of 0.15 mm (0.006 inch) maximum per side are not included.
Outlineversion

w

8°
0°
8°
0°

sot109-1_po

Europeanprojection

Issue date
03-02-19
23-10-27

MS-012

Package outline SOT109-1 (SO16)

CBT3251

Product data sheet

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CBT3251

Nexperia

1-of-8 FET multiplexer/demultiplexer
TSSOP16: plastic thin shrink small outline package; 16 leads; body width 4.4 mm

SOT403-1

E

D

A

X

c
y

HE

v M A

9

16

A2
pin 1 index

A3

A

A1
θ
Lp

1

L

8

detail X

w M

bp

e

0

5 mm
scale

Dimensions (mm are the original dimensions)
Unit
mm

A

A1

A2

A3

bp

c

max 1.20 0.15 1.05
0.30 0.2
nom
0.25
0.05 0.80
0.19 0.09
min

D(1)

E(2)

5.1

4.5

4.9

4.3

e

HE

0.65

6.6
6.2

L
1

Lp
0.75
0.45

v
0.2

w
0.1

y
0.1

θ
8°
0°

Note
1. Plastic or metal protrusions of 0.15 mm maximum per side are not included.
2. Plastic interlead protrusions of 0.25 mm maximum per side are not included.
Outlineversion
SOT403-1

Fig. 6.

References
IEC

JEDEC

JEITA

sot403-1_po

Europeanprojection

Issue date
03-02-18
23-10-27

MO-153

Package outline SOT403-1 (TSSOP16)

CBT3251

Product data sheet

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CBT3251

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1-of-8 FET multiplexer/demultiplexer

12. Abbreviations
Table 10. Abbreviations
AcronymDescription

CDM

Charged Device Model

DUT

Device Under Test

ESD

ElectroStatic Discharge

FET

Field-Effect Transistor

HBM

Human Body Model

TTL

Transistor-Transistor Logic

13. Revision history
Table 11. Revision history
Document ID

Release date

Data sheet status

Change notice Supersedes

CBT3251 v.5

20240418

Product data sheet-

Modifications:•••Fig. 5, Fig. 6: Aligned SO and TSSOP package outline drawings to JEDEC MS-012 andMO-153.
Section 2: ESD specification updated according to the latest JEDEC standard.
Section 9: RON specification updated in line with CBT family.

CBT3251 v.4

20210324

Modifications:

•
•
•
•

20160316

Modifications:•

CBT3251 v.2

20130916

Modifications:•

CBT3251 v.1

CBT3251

Product data sheet

Product data sheet-

CBT3251 v.3

The format of this data sheet has been redesigned to comply with the identity
guidelines of Nexperia.
Legal texts have been adapted to the new company name where appropriate.
Section 1 and Section 2 updated.
Type number CBT3251DB (SOT338-1 / SSOP16) removed.

CBT3251 v.3••

CBT3251 v.4

Product data sheet-

CBT3251 v.2-

CBT3251 v.1Type number CBT3251DS removed
Product data sheet

The format of this data sheet has been redesigned to comply with the new identity
guidelines of NXP Semiconductors.
Legal texts have been adapted to the new company name where appropriate.
Table 6 pass voltage modified.

20051221

Product data sheet-

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Rev. 5 — 18 April 2024-

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1-of-8 FET multiplexer/demultiplexer

14. Legal information

injury, death or severe property or environmental damage. Nexperia and its
suppliers accept no liability for inclusion and/or use of Nexperia products insuch equipment or applications and therefore such inclusion and/or use is at
the customer’s own risk.

Data sheet status

Quick reference data — The Quick reference data is an extract of the
product data given in the Limiting values and Characteristics sections of thisdocument, and as such is not complete, exhaustive or legally binding.

Document status[1][2]

Product
status [3]Definition

Objective [short]data sheet

Development

This document contains data fromthe objective specification for
product development.

Preliminary [short]data sheet

Qualification

This document contains data fromthe preliminary specification.

Product [short]data sheet

Production

This document contains the productspecification.

[1]
[2]
[3]

Please consult the most recently issued document before initiating orcompleting a design.
The term 'short data sheet' is explained in section "Definitions".
The product status of device(s) described in this document may havechanged since this document was published and may differ in case ofmultiple devices. The latest product status information is available on
the internet at https://www.nexperia.com.

Definitions
Draft — The document is a draft version only. The content is still underinternal review and subject to formal approval, which may result in
modifications or additions. Nexperia does not give any representations or
warranties as to the accuracy or completeness of information included hereinand shall have no liability for the consequences of use of such information.
Short data sheet — A short data sheet is an extract from a full data sheetwith the same product type number(s) and title. A short data sheet isintended for quick reference only and should not be relied upon to containdetailed and full information. For detailed and full information see the relevant
full data sheet, which is available on request via the local Nexperia sales
office. In case of any inconsistency or conflict with the short data sheet, thefull data sheet shall prevail.
Product specification — The information and data provided in a Productdata sheet shall define the specification of the product as agreed between
Nexperia and its customer, unless Nexperia and customer have explicitly
agreed otherwise in writing. In no event however, shall an agreement bevalid in which the Nexperia product is deemed to offer functions and qualities
beyond those described in the Product data sheet.

Disclaimers
Limited warranty and liability — Information in this document is believed
to be accurate and reliable. However, Nexperia does not give any
representations or warranties, expressed or implied, as to the accuracy
or completeness of such information and shall have no liability for theconsequences of use of such information. Nexperia takes no responsibility
for the content in this document if provided by an information source outsideof Nexperia.
In no event shall Nexperia be liable for any indirect, incidental, punitive,
special or consequential damages (including - without limitation - lost
profits, lost savings, business interruption, costs related to the removalor replacement of any products or rework charges) whether or not suchdamages are based on tort (including negligence), warranty, breach ofcontract or any other legal theory.
Notwithstanding any damages that customer might incur for any reason
whatsoever, Nexperia’s aggregate and cumulative liability towards customer
for the products described herein shall be limited in accordance with theTerms and conditions of commercial sale of Nexperia.
Right to make changes — Nexperia reserves the right to make changes
to information published in this document, including without limitation
specifications and product descriptions, at any time and without notice. This
document supersedes and replaces all information supplied prior to the
publication hereof.
Suitability for use — Nexperia products are not designed, authorized or
warranted to be suitable for use in life support, life-critical or safety-criticalsystems or equipment, nor in applications where failure or malfunctionof an Nexperia product can reasonably be expected to result in personal

CBT3251

Product data sheet

Applications — Applications that are described herein for any of theseproducts are for illustrative purposes only. Nexperia makes no representation
or warranty that such applications will be suitable for the specified use
without further testing or modification.
Customers are responsible for the design and operation of their applications
and products using Nexperia products, and Nexperia accepts no liability forany assistance with applications or customer product design. It is customer’ssole responsibility to determine whether the Nexperia product is suitableand fit for the customer’s applications and products planned, as well as
for the planned application and use of customer’s third party customer(s).
Customers should provide appropriate design and operating safeguards tominimize the risks associated with their applications and products.
Nexperia does not accept any liability related to any default, damage, costs
or problem which is based on any weakness or default in the customer’s
applications or products, or the application or use by customer’s third party
customer(s). Customer is responsible for doing all necessary testing for thecustomer’s applications and products using Nexperia products in order toavoid a default of the applications and the products or of the application or
use by customer’s third party customer(s). Nexperia does not accept any
liability in this respect.
Limiting values — Stress above one or more limiting values (as defined in
the Absolute Maximum Ratings System of IEC 60134) will cause permanent
damage to the device. Limiting values are stress ratings only and (proper)
operation of the device at these or any other conditions above thosegiven in the Recommended operating conditions section (if present) or theCharacteristics sections of this document is not warranted. Constant or
repeated exposure to limiting values will permanently and irreversibly affect
the quality and reliability of the device.
Terms and conditions of commercial sale — Nexperia products are
sold subject to the general terms and conditions of commercial sale, as
published at http://www.nexperia.com/profile/terms, unless otherwise agreed
in a valid written individual agreement. In case an individual agreement isconcluded only the terms and conditions of the respective agreement shallapply. Nexperia hereby expressly objects to applying the customer’s generalterms and conditions with regard to the purchase of Nexperia products bycustomer.
No offer to sell or license — Nothing in this document may be interpreted
or construed as an offer to sell products that is open for acceptance or the
grant, conveyance or implication of any license under any copyrights, patents
or other industrial or intellectual property rights.
Export control — This document as well as the item(s) described herein
may be subject to export control regulations. Export might require a priorauthorization from competent authorities.
Non-automotive qualified products — Unless this data sheet expressly
states that this specific Nexperia product is automotive qualified, theproduct is not suitable for automotive use. It is neither qualified nor tested inaccordance with automotive testing or application requirements. Nexperia
accepts no liability for inclusion and/or use of non-automotive qualified
products in automotive equipment or applications.
In the event that customer uses the product for design-in and use inautomotive applications to automotive specifications and standards,
customer (a) shall use the product without Nexperia’s warranty of the
product for such automotive applications, use and specifications, and (b)whenever customer uses the product for automotive applications beyond
Nexperia’s specifications such use shall be solely at customer’s own risk,and (c) customer fully indemnifies Nexperia for any liability, damages or failed
product claims resulting from customer design and use of the product for
automotive applications beyond Nexperia’s standard warranty and Nexperia’s
product specifications.
Translations — A non-English (translated) version of a document is forreference only. The English version shall prevail in case of any discrepancy
between the translated and English versions.

Trademarks
Notice: All referenced brands, product names, service names andtrademarks are the property of their respective owners.

All information provided in this document is subject to legal disclaimers.

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1-of-8 FET multiplexer/demultiplexer

Contents
1. General description...................................................... 1
2. Features and benefits.................................................. 1
3. Ordering information....................................................1
4. Functional diagram.......................................................2
5. Pinning information......................................................2
5.1. Pinning.........................................................................2
5.2. Pin description............................................................. 3
6. Functional description................................................. 3
7. Limiting values............................................................. 3
8. Recommended operating conditions..........................4
9. Static characteristics....................................................4
10. Dynamic characteristics............................................ 5
10.1. Waveforms and test circuit........................................ 5
11. Package outline.......................................................... 7
12. Abbreviations.............................................................. 9
13. Revision history..........................................................914. Legal information......................................................10© Nexperia B.V. 2024. All rights reserved

For more information, please visit: http://www.nexperia.com
For sales office addresses, please send an email to: salesaddresses@nexperia.com
Date of release: 18 April 2024

CBT3251

Product data sheet

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Rev. 5 — 18 April 2024

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11 / 11