Type MK Precision Power Film Radial-Lead Resistors
Page 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 with
standard lead spacings, Type MK Precision Power Radial-
Lead 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 from
5 ohms to 5 Megohms and ≤ 80 ppm/°C up to
100 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 faster
settling times and minimum distortion in all types of high
frequency circuits.
This combination of performance advantages in a small,
standardized case can simplify many engineering and
production problems:
One size of Type MK resistor can replace many sizes of
axial-lead resistors.
This table of "RN" style axial-lead resistors shows the
many sizes and power ratings that can be replaced with one
of 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
Type
MK120
or MK620
Power
Rating
0.50 W
Maximum
Resistance
40 Megohms
100 Megohms
1 Megohm
5 Megohms
10 Megohms
20 Megohms
Mounting
Hole
Spacing
.150
(3.81)
.200
(5.08)
.400
(10.15)
.500
(12.70)
.625
(15.90)
.875
(22.20)
1.000
(25.40)
RN50
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 for
leaving extra space where
resistor value changes can
require larger resistors
or
non-
uniform 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 radial
leads do not require additional bending prior to insertion, and
the standard lead spacing can reduce the time required for
assembly.
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 and
inventory problems simplified. For specific price and delivery
information, contact our Sales Office.
Even the smallest Type MK
resistor can replace all of these
RN type resistors
MK132, MK132V,
0.75 W
MK632, or MK632V
RN50
RN55
RN60
RN65
0.05 W
0.10 W
0.125 W
0.25 W
RN55
RN60
RN65
RN70
0.50 W
40 Megohms
RN70
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 a
mounting 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
Type MK Precision Power Film Radial-Lead Resistors
Page 2 of 2
Type MK Precision Film Resistors - Low and Standard Resistance Ranges
Model
No.
MK
120
MK
132
MK
132V
Watt-
age
0.50
0.75
0.75
Oper.
Max. Temp. Dielect.
Voltage Max. Strength
200
400
400
Resistance
Low
Min.
Standard
Min.
Standard
Max.
Dimensions
Encapsulation
Leadwire
Tinned Copper
Tinned Copper
Tinned Copper
Comments
175°C
175°C
175°C
300
400
400
1
Ω
1
Ω
1
Ω
5
Ω
5
Ω
5
Ω
2 Meg
5 Meg
5 Meg
Ref. Case "A" Dwg. Transfer Molded
Ref. Case "B" Dwg.
Transfer Molded
Ref. Case "C" Dwg. Transfer Molded
With Standoff
Resistance Tolerance:
±1% (tolerances
to ±0.1% available on values of 30 ohms or
higher).
Overload/Overvoltage:
5 times rated
power with applied voltage not to
exceed 1.5 times maximum continuous
operating voltage for 5 seconds,
ΔR
±(0.15
percent + 0.01 ohm) max.
Op e ra t in g Te m p e r a t u r e :
- 5 5 °C t o
+175°C.
Temperature Coefficient:
Resistance Range
Standard : 5
Ω
and above
Low : 1
Ω
to 4.99
Ω
Temp. Coef.
50 ppm/°C
200 ppm/°C
Load Life:
1,000 hours at +125°C at rated
power,
ΔR
±(0.4 percent +0.01 ohm)
max.
Thermal Shock:
Mil-Std-202, Method 107,
Cond. B,
ΔR
±(0.2 percent +0.01 ohm)
max.
Moisture Resistance:
Mil-Std-202, Meth-
od 106,
ΔR
±(0.5 percent + 0.01 ohm)
max.
Temperature Coefficient referenced to
+25°C,
ΔR
taken at -15°C and +105°C.
Insulation Resistance:
10,000 Megohms,
minimum.
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
Model
No.
MK
620
MK
632
MK
632V
Watt-
age
0.50
0.75
0.75
Oper.
Max. Temp. Dielect.
Voltage Max. Strength
200
400
400
TC
ppm/
°C
80
80
80
Resistance
Min.
Max.
Dimensions
Encapsulation
Leadwire
Tinned Copper
Tinned Copper
Tinned Copper
Comments
175°C
175°C
175°C
300
400
400
2.01 Meg
5.01 Meg
5.01 Meg
40 Meg
100 Meg
100 Meg
Ref. Case "A" Dwg.
Transfer Molded
Ref. Case "B" Dwg.
Transfer Molded
Ref. Case "C" Dwg. Transfer Molded
With Standoff
Resistance Tolerance:
±1% (consult
factory for tighter tolerances).
Overload/Overvoltage:
1.5 times max.
voltage for 5 seconds,
ΔR
0.5% max.
Operating Temperature:
+175°C.
-55°C to
Temperature Coefficient:
See Table for
TC value. TC referenced to +25°C,
ΔR
taken at -15°C and +105°C.
Insulation Resistance:
10,000 Megohms,
minimum.
Load Life:
1,000 hours at +125°C at rated
power,
ΔR
0.5% max.
Thermal Shock:
Mil-Std-202, Method 107,
Cond. B,
ΔR
0.5% max.
Moisture Resistance:
Mil-Std-202,
Method 106,
ΔR
0.5% max.
Model MK120 and MK620
.245
±.010
(6.22
±.26)
Case "A"
Case "B"
Model MK132 and MK632
.290
±.010
(7.37
±.26)
.095
±.005
(2.41
±.13)
MK632
100 MEG
1%
Case "C"
Model MK132V and MK632V
.290
±.010
(7.37
±.26)
MK632V
100 MEG
1%
.095
±.005
(2.41
±.13)
MK120
10.0
1%
.095
±.005
(2.41
±.13)
.030
±.004
(.76
±
.10)
.250
±.050
(6.35
±1.27)
.290
±.010
(7.37
±.26)
+.125
1.50
-.000
+3.18)
(38.10
-0.00)
.150
±.015
(3.81
±.38)
(CENTERED)
.245
±.010
(6.22
±.26)
.025
±.002
(.64
±.05)
DIA.,
LEADWIRE
OFFSET
.012 (.31)
FROM
CENTERLINE
+.125
1.50 -.000
+3.18)
(38.10 -0.00)
.290
±.010
(7.37
±.26)
.200
±.015
(5.08
±.38)
(CENTERED)
.025
±.002
(.64
±.05)
DIA.,
LEADWIRE
OFFSET
.012 (.31)
FROM
CENTERLINE
.090
(2.29)
.200
±.015
(5.08
±.38)
(CENTERED)
.025
±.002
(.64
±.05)
DIA.,
LEADWIRE
OFFSET
.012 (.31)
FROM
CENTERLINE
RATED LOAD, %
Ordering Information:
Model Number:
MK132 - 500K - 1%
Derating Curve:
Tolerance
100
80
60
40
20
0
25
75
125
175
225
Resistor Value:
ALL DIMENSIONS IN INCHES AND (MILLIMETERS)
AMBIENT TEMPERATURE,
°C
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
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