Product Brief
RoHS & REACH Compliant

Zero Temperature Coefficient (ZTC)
Current Limiting Diodes*™

ZTCDPAK*ALSO R E FE R R E D TO AS C UR R E NT R E G UL AT I NG DI O D E

Central Semiconductor’s CDCLD series of ZTC Current Limiting Diodes (ZTC CLDs) is specifically designed for applications
requiring a constant current regulation. The ZTC CDCLD series was designed with a unique process which maintains
constant current over a broad temperature range. This Zero Temperature Coefficient feature eliminates the need for
additional resistors to compensate for variation in the current limit as a result of changes in temperature. The regulator
current values range from 27.5mA to 575mA with a maximum limiting voltage (VL) from 1.5V to 2.0V.
Manufactured in the industry standard DPAK surface mount package, these Industry First devices are ideal for highintensity industrial and consumer lighting systems, as well as test/measurement equipment and standard LED applications.
The complete range of devices is also available in bare die for space constrained assemblies and module applications.

FeaturesApplications• Constant current range• Temperature independance• High stability over wide
temperature range• Nominal current regulation atlow voltage input• Bare die coming soon

• High intensity lighting systems• Infrastructure lighting systems• LED drivers• Light dimming systems• Test/measurement equipment

Maximum Ratings (TA = 25˚C)

Central Part No.

Peak Operating
Voltage

Operating &Junction Storage
Temperature

POVTJ, Tstg

Benefits• Eliminates need for additionalresistors• Active current source
performance• Optimized for heat disspiation

Electrical Characteristics (TA = 25˚C unless otherwise noted)
Regulator
Current

Maximum
Limiting
Voltage(tp=5.0ms)(tp=4.5ms)
IP @ VT=5.0V
NOM
(mA)

MAX(mA)VL @ IL=0.8 x IP MIN(V)

(V)

(°C)

MIN
(mA)

CDCLD025*50-55 to +150

22.5

25

27.5

1.5

CDCLD040*

50-55 to +150

36

40

44

1.5

CDCLD080

50-55 to +150

72

80

88

1.8

CDCLD100

50-55 to +150

85

100

115

2.0

CDCLD12045-55 to +150

102

120

138

2.0

CDCLD200

27-55 to +150

170

200

230

2.0

CDCLD400

13.5-55 to +150

340

400

460

2.0

CDCLD500

10.8-55 to +150

425

500

5752.0* Item under development.

Bare die coming soon
SPICE Models, Package Details and other technical resources:

RoHS and REACH compliance declarations

Engineering resources are available at www.centralsemi.com.

Visit the Quality section of Central’s website to access.

Central Semiconductor Corp. • 145 Adams Avenue•Hauppauge, NY 11788 • USA • www.centralsemi.com

CDCLD025 Series
CDCLD200 Series

Zero Temperature Coefficient
Current Limiting Diodes

Typical Electrical Characteristics:
CDCLD025 thru CDCLD120

Central Semiconductor Corp. • 145 Adams Avenue

Typical Electrical Characteristics:
CDCLD200 thru CDCLD500•Hauppauge, NY 11788 • USA • www.centralsemi.com

CDCLD025 Series
CDCLD200 Series

Zero Temperature Coefficient
Current Limiting Diodes
Example Applications:

LED String:
CLDs can be used to limit the current flowing through LED strings. This dynamic performance makes CLDs an excellent
replacement for current limiting resistors, as they allow for continuous current regulation regardless of input voltage.
LED strings like this are commonly used in dimming lighting systems. By using a PWM input to control the transistor, theLED luminosity can be controlled by extending or decreasing the pulse width, allowing for control over the brightness ofthe LED.

Differential Amplifier with Current Source:
When designing differential amplifiers, it is essential to use a high impedance tail resistor to control both differential andcommon mode function. For differential signals, the tail resistor effectively splits the current amongst the transistors.
This ensures proportional current increase and decrease between the transistors. The high impedance drives down thecommon mode gain and increases the common mode rejection ratio, thus yielding a more ideal amplifier. Ideally, aninfinite impedance current source would be used in place of the tail resistor. While the ideal current source doesn’t exist,
the CDCLD series serves as an excellent replacement for the tail resistor. The CDCLD CLDs perform much like an active
current source, both regulating the circuit to a constant current and presenting a large tail impedance. This yields alarger CMRR than if a high impedance tail resistor is used.

Central Semiconductor Corp. • 145 Adams Avenue•

Hauppauge, NY 11788 • USA • www.centralsemi.com

CDCLD025 SeriesCDCLD200 Series

Zero Temperature Coefficient
Current Limiting Diodes

Mechanical Drawing:
DPAK

Mounting Pad Geometry(Dimensions in mm)

Tape Dimensions and Orientation(Dimensions in mm)

SYMBOL
A
B
C
DEF
GH
JK
LM
N
P
R

DIMENSIONSINCHESMILLIMETERS
MIN
MAX
MIN
MAX
0.083 0.108
2.10
2.75
0.016 0.032
0.40
0.81
0.035 0.063
0.89
1.60
0.203 0.228
5.15
5.79
0.020
0.51
0.016 0.024
0.40
0.60
0.051 0.071
1.30
1.80
0.248 0.268
6.30
6.81
0.197 0.217
5.00
5.50
0.209 0.2455.30
6.22
0.025 0.040
0.64
1.02
0.090 0.115
2.30
2.91
0.012 0.045
0.30
1.14
0.180
4.60
0.090
2.30
DPAK (REV: R1)

Devices are taped inaccordance withElectronic Industries
Association Standard
EIA-481-D

Direction of Unreeling

Tape Width: 16mm

Packaging BasePart Marking: Full Part Number
Lead Code: Reference individual device datasheet.

Reel Size

Quantity

13”

2,500 pcs.

Reel Packing Information
ReelSize13”

Reels per Parts per
Box
Box(Max.)(Max.)Box Dimensions

Shipping Weight (Max.)

INCH

CMLB

KG

410,000

15x4x1538x10x38

147922,500

15x15x938x38x23

29141845,00015x15x1838x38x4657

26

Ordering Information
ReelSize13”

For more information on Central’s products and solutions:

Call us at: 1.631.435.1110
Or view online: www.centralsemi.com/featured-products

Orderable Part No.
Add “TR13” as suffix to Central part no.
(example: CDCLD025 TR13)

CustomSolutions
AvailablePB ZTC CLD (R3 1121)