End of Life - Last Order Date: April 30, 2018

Last Ship Date: July 31, 2018

Type MK Precision Power Film Radial-Lead Resistors

For Replacement Parts see the RoHS Compliant Models MK227, MK727, MK232, and MK732Page 1 of 2

Non-Inductive with Expanded Resistance Range — 1 ohm to 100 Megohms
Here are the precision radial lead resistors that provide
high density packaging in circuit board applications. Available
in three miniature rectangular package conﬁgurations withstandard lead spacings, Type MK Precision Power RadialLead Film Resistors now cover the entire resistance range
from 1 ohm to 100 Megohms.
Constructed with Caddock's Micronox ® resistance ﬁlms
ﬁred onto a solid ceramic substrate, Type MK Precision Film
Resistors combine all of these outstanding advantages:• ±1% Resistance Tolerance is Standard - tolerances to±0.1% are available on special order.
• Operating Temperature - from -55°C to +175°C.
• Full Power Rating at +125°C.
• Temperature Coefﬁcient is ≤ 50 ppm/°C from5 ohms to 5 Megohms and ≤ 80 ppm/°C up to100 Megohms - referenced to +25°C with the ΔR taken
at -15°C and +105°C.
• Extended Life Stability is Typically Better Than 0.1%
per 1,000 Hours.
• Caddock's Non-Inductive Performance - provides fastersettling times and minimum distortion in all types of highfrequency circuits.
This combination of performance advantages in a small,standardized case can simplify many engineering andproduction problems:
One size of Type MK resistor can replace many sizes ofaxial-lead resistors.
This table of "RN" style axial-lead resistors shows themany sizes and power ratings that can be replaced with oneof the three models of Type MK Precision Film Resistors,
within the maximum allowable voltage ratings.
Comparison of Type MK and "RN" Ratings and Dimensions
Resistor
TypePowerRating

MaximumResistance

Mounting
HoleSpacing

MK120
or MK620

0.50 W

40 Megohms.150(3.81)MK132, MK132V,
0.75 W
MK632, or MK632V

100 Megohms.200(5.08)

Even the smallest Type MK
resistor can replace all of these
RN type resistors

One standard resistor conﬁguration can simplify board
layouts.

With the exceptionally wide range of resistance values
that are available in each model of Type MK Precision Film
Resistors, circuits can now be
designed for maximum
packaging densities
without the need forleaving extra space whereresistor value changes canrequire larger resistors or nonuniform lead spacings.
Standardization of resistor size can speed
assembly procedures and reduce procurement costs.

The standardization of resistor size can pay additional
dividends by simplifying assembly procedures. The radialleads do not require additional bending prior to insertion, andthe standard lead spacing can reduce the time required for
assembly.

RN50

0.05 W

1 Megohm.400(10.15)

RN55

0.10 W

5 Megohms.500(12.70)

RN60

0.125 W

10 Megohms.625(15.90)RN65

0.25 W

20 Megohms.875(22.20)

RN65

RN70

0.50 W

40 Megohms

1.000(25.40)

RN70

RN50

RN55
RN60

The combination of higher power ratings and smaller size
can also lower procurement costs. By reducing the wide
variety of sizes and types of axial-lead resistors to a single,
standardized resistor type, unit prices can be lowered andinventory problems simpliﬁed. For speciﬁc price and delivery
information, contact our Sales Ofﬁce.

All outline drawings full size - dimensions in inches and (millimeters).

The largest Type MK - rated at .75 watt - requires less board
space than even the .05 watt RN50.
The smallest Type MK - rated at .50 watt - provides power
dissipation equal to the RN70 resistor. The RN70 resistor requires amounting hole spacing of 1 inch and a side-to-side spacing of .25
inch, resulting in a total mounting area of .25 square inch - 10 times
the area required for a .50 Watt Type MK resistor!
Applications Engineering
17271 North Umpqua Hwy.
Roseburg, Oregon 97470-9422
Phone: (541) 496-0700
Fax: (541) 496-0408© 2004 Caddock Electronics, Inc.

CADDOCK

e-mail: caddock@caddock.com • web: www.caddock.com
For Caddock Distributors listed by country see caddock.com/contact/dist.html

Sales and Corporate Ofﬁce
1717 Chicago Avenue
Riverside, California 92507-2364
Phone: (951) 788-1700
Fax: (951) 369-1151
28_IL100.1004

End of Life - Last Order Date: April 30, 2018

Last Ship Date: July 31, 2018

Type MK Precision Power Film Radial-Lead Resistors
For Replacement Parts see the RoHS Compliant Models MK227, MK727, MK232, and MK732

Page 2 of 2

Type MK Precision Film Resistors - Low and Standard Resistance Ranges
Oper.
Max. Temp. Dielect.
Voltage Max. StrengthModelNo.

Wattage

MK 1200.50

200175°C

300

MK 1320.75400175°C

400

MK 132V

0.75400175°C

400

Resistance Tolerance: ±1% (tolerances
to ±0.1% available on values of 30 ohms orhigher).

Overload/Overvoltage: 5 times rated
power with applied voltage not toexceed 1.5 times maximum continuous
operating voltage for 5 seconds, ΔR ±(0.15percent + 0.01 ohm) max.
Operating Temp eratu re: -55° C t o+175°C.

Low
Min.

ResistanceDimensions

Comments

Leadwire

Encapsulation

StandardMin.

StandardMax.

1Ω

5Ω

2 Meg

Ref. Case "A" Dwg. Transfer Molded

1Ω

5Ω

5 Meg

Ref. Case "B" Dwg. Transfer Molded

Tinned Copper

1Ω

5Ω

5 Meg

Ref. Case "C" Dwg. Transfer Molded

Tinned Copper

Temp. Coef.

Standard : 5 Ω and above

50 ppm/°C

Low : 1 Ω to 4.99 Ω200 ppm/°C

With Standoff

Load Life: 1,000 hours at +125°C at rated
power, ΔR ±(0.4 percent +0.01 ohm)max.

Temperature Coefﬁcient:Resistance Range

Tinned Copper

Temperature Coefficient referenced to+25°C, ΔR taken at -15°C and +105°C.

Insulation Resistance: 10,000 Megohms,minimum.

Thermal Shock: Mil-Std-202, Method 107,Cond. B, ΔR ±(0.2 percent +0.01 ohm)
max.

Moisture Resistance: Mil-Std-202, Method 106, ΔR ±(0.5 percent + 0.01 ohm)max.

Measurement Note: Resistance measurement on low resistance values shall be made at a point within 0.2 inch (5.08 mm) of the body.

Type MK Precision Film Resistors - Extended Resistance Range
ModelNo.

WattageOper.
Max. Temp. Dielect.
Voltage Max. Strength

Min.

Max.

Dimensions

Comments

Leadwire

Encapsulation

MK 6200.50

200175°C

30080

2.01 Meg

40 MegRef. Case "A" Dwg. Transfer Molded

Tinned Copper

MK 6320.75400175°C

40080

5.01 Meg

100 Meg

Ref. Case "B" Dwg. Transfer Molded

Tinned Copper

MK 632V

0.75400175°C

40080

5.01 Meg

100 Meg

Ref. Case "C" Dwg. Transfer Molded

Tinned Copper

Overload/Overvoltage: 1.5 times max.
voltage for 5 seconds, ΔR 0.5% max.
Operating Temperature:+175°C.

-55°C toModel MK120 and MK620

MK12010.0
1%+.125
1.50 -.000+3.18)(38.10 -0.00).150 ±.015(3.81 ±.38)(CENTERED)

Resistor Value:

Thermal Shock: Mil-Std-202, Method 107,Cond. B, ΔR 0.5% max.

Moisture Resistance: Mil-Std-202,
Method 106, ΔR 0.5% max.

Case "C"Model MK132 and MK632.290±.010(7.37±.26)

Model MK132V and MK632V.095 ±.005(2.41 ±.13)

MK632V
100 MEG
1%+.125
1.50 -.000+3.18)(38.10 -0.00).025 ±.002(.64 ±.05) DIA.,LEADWIRE
OFFSET.012 (.31)
FROM
CENTERLINE.200 ±.015(5.08 ±.38)(CENTERED)MK132 - 500K - 1%

.095 ±.005(2.41 ±.13).290 ±.010(7.37 ±.26)

MK632
100 MEG
1%.245 ±.010(6.22 ±.26)

Ordering Information:
Model Number:

Insulation Resistance: 10,000 Megohms,minimum.

.290 ±.010(7.37 ±.26).025 ±.002(.64 ±.05) DIA.,LEADWIRE
OFFSET.012 (.31)
FROM
CENTERLINE.090(2.29)

Derating Curve:
Tolerance© 2004 Caddock Electronics, Inc.

.290 ±.010(7.37 ±.26).250 ±.050(6.35 ±1.27).025 ±.002(.64 ±.05) DIA.,LEADWIRE
OFFSET.012 (.31)
FROM
CENTERLINE

1008060
40200

CADDOCK.030 ±.004(.76 ± .10).200 ±.015(5.08 ±.38)(CENTERED)ALL DIMENSIONS IN INCHES AND (MILLIMETERS)Applications Engineering
17271 North Umpqua Hwy.
Roseburg, Oregon 97470-9422
Phone: (541) 496-0700
Fax: (541) 496-0408

With Standoff

Load Life: 1,000 hours at +125°C at rated
power, ΔR 0.5% max.

Case "B"

Case "A".095 ±.005(2.41 ±.13)

Temperature Coefﬁcient: See Table forTC value. TC referenced to +25°C, ΔR
taken at -15°C and +105°C.

RATED LOAD, %Resistance Tolerance: ±1% (consult
factory for tighter tolerances).

.245
±.010
(6.22±.26)

ResistanceTCppm/°Ce-mail: caddock@caddock.com • web: www.caddock.com
For Caddock Distributors listed by country see caddock.com/contact/dist.html

2575

125

175

225

AMBIENT TEMPERATURE, °C

Sales and Corporate Ofﬁce
1717 Chicago Avenue
Riverside, California 92507-2364
Phone: (951) 788-1700
Fax: (951) 369-1151
28_IL100.1004