IL115.0710
Sales and Corporate Ofce
1717 Chicago Avenue
Riverside, California 92507-2364
Phone: (951) 788-1700
Fax: (951) 369-1151
Applications Engineering
17271 North Umpqua Hwy.
Roseburg, Oregon 97470-9422
Phone: (541) 496-0700
Fax: (541) 496-0408 e-mail: caddock@caddock.com • web: www.caddock.com
For Caddock Distributors listed by country see caddock.com/contact/dist.html
© 2010 Caddock Electronics, Inc.
ELECTRONICS, INC.
Type TK Low TC Precision Radial-Lead Resistors with
the Tetrinox® resistance system solve the reliability problems
related to other low TC precision resistor technologies. The
robust construction of Caddock's Type TK Resistors provides
reliable operation even in harsh temperature cycling and/or
power cycling environments.
Type TK Low TC Precision Radial-Lead Film Resistors
provide a combination of performance advantages never
before available in a resistive component:
• Low Temperature Coefcient - better than 5 ppm/°C,
10 ppm/°C, or 20 ppm/°C over the entire temperature range
from -55°C to +125°C!
• Long-Term Absolute Stability - typically better than
±0.05% per 2,000 hours of operation.
• Extended Resistance Range -
from 1 K ohm to 10 Megohm.
• Precision Tolerances - ±0.1% is
standard, and tolerances of ±1%
and ±0.05% are available.
• Wide Operating Temperature
Range - from -55°C to +175°C.
• Small Size - with four miniature
rectangular cases for maximum
packaging density and minimum
mounting area.
• High Power Density - with power
ratings of 0.2 Watt and 0.3 Watt in
molded cases, the largest of
which is a standard CK06 package.
• Caddock's Non-Inductive Performance - provides faster
settling times and minimum distortion in all types of high
frequency circuits.
• High Density Packaging - the radial-lead mounting and
small rectangular case of the Type TK resistors permit high
packaging densities in low prole circuitry. Because the
four models of the Type TK resistors are available in an
exceptionally wide range of resistance values, lead spacing
and mounting space can be standardized in a larger
number of designs.
Low TC of 5 ppm/°C, 10 ppm/°C, or 20 ppm/°C and Resistance Range from 1 Kohm to 10 Meg
Type TK Low TC Precision Radial-Lead Film Resistors
(Photos show
resistors full size)
Page 1 of 2
The Tetrinox® Resistance System was introduced
by Caddock in 1975. Tetrinox provides a wide range of
resistivities, with the higher resistivities capable of producing
resistance values up to 100 times higher than other ultra-low
TC resistors in a similar size component. The essentially
linear TC is well within 10 ppm/°C over the entire temperature
range from -55°C to +125°C. By using
TK resistors engineers can design high precision circuits with
lower current drain and lower power requirements.
Through our R&D, Caddock has continued to improve
the Tetrinox Resistance System, building on over 40 years of
experience with our unique complex oxide resistance system
technologies.
Low TC “Matched-Pair” Voltage Dividers can be
Assembled Without Pre-Selection of Resistors.
An important application for Type TK resistors is in
“matched-pair” voltage dividers where the low 5 ppm/°C
temperature coefcient provides ratio tracking of less than 10
ppm/°C without resistor pre-selection or special testing. With
factory selection, Type TK resistor pairs can be matched to
within 1 ppm/°C.
For Military Applications, Caddock recommends the
“Pure Tin Free” design of Models TK134 and TK634, that
have Gold Plated lead nish.
Please see the “TK134 and TK634” data sheet.
Recommended Limitation of Use:
The Type TK resistors that are shown on this data sheet have
pure matte tin (Sn) lead nish which is a preferred lead nish
in commercial and industrial applications. These resistors are
recommended by Caddock for use only in commercial and
industrial applications. Any use of this product in a military
program, against this recommended limitation of use, will be
completely supported by the customer program design activity
and component engineering activity based on their complete
evaluation and testing, there will be no support provided by
Caddock for this military use.
Background regarding the “Recommended Limitation of
Use” for these Type TK resistors:
Presently, military applications either prohibit the use of a
matte tin lead nish or are trending toward this prohibition.
Therefore, Caddock no longer recommends and no longer
supports, in any way, the Type TK Resistors that are shown
on this data sheet for use in military applications.
Sales and Corporate Ofce
1717 Chicago Avenue
Riverside, California 92507-2364
Phone: (951) 788-1700
Fax: (951) 369-1151
Applications Engineering
17271 North Umpqua Hwy.
Roseburg, Oregon 97470-9422
Phone: (541) 496-0700
Fax: (541) 496-0408 e-mail: caddock@caddock.com • web: www.caddock.com
For Caddock Distributors listed by country see caddock.com/contact/dist.html
© 2010 Caddock Electronics, Inc.
ELECTRONICS, INC.
IL115.0710
Model TK121 and TK621
2.00 MEG
TK621
0.1%
1.50
+3.18)
-0.00)
+.125
-.000
.150 ±.015
(3.81 ±.38)
(CENTERED)
.245
±.010
(6.22
±.26)
(38.10
.095 ±.005
(2.41 ±.13)
.245 ±.010
(6.22 ±.26)
.025 ±.002
(.64 ±.05) DIA.,
LEADWIRE
OFFSET
.012 (.31)
FROM
CENTERLINE
Model TK133 and TK633
.290
±.010
(7.37
±.26)
1.50
+3.18)
-0.00)
+.125
-.000
(38.10
.095 ±.005
(2.41 ±.13)
.025 ±.002
(.64 ±.05) DIA.,
LEADWIRE
OFFSET
.012 (.31)
FROM
CENTERLINE
.290 ±.010
(7.37 ±.26)
.200 ±.015
(5.08 ±.38)
(CENTERED)
10.0 MEG
TK633
0.1%
Case "B"
Resistance
Min.
Max.
Dimensions
Encapsulation
Leadwire
Max.
Working
Voltage
Model
No.
Wattage
@
+125°C
Temperature
Coefficient
ppm/°C
Dielect.
Strength
Comments
Ref. Case "D" Dwg.
TK133V
0.3
300
5, 10, or 20
400
1 K
1.5 Meg
With Standoff
Ref. Case "B" Dwg.
TK133
0.3
300
5, 10, or 20
400
1 K
1.5 Meg
Ref. Case "A" Dwg.
Tinned Copper
TK121
0.2
200
5, 10, or 20
300
1 K
500 K
Ref. Case "C" Dwg.
TK
139
0.3 3005, 10, or 20 400 1 K
1.5 Meg
Limited
by
Maximum
Working
Voltage
Ref. Case "D" Dwg.
TK633V
300
5, 10 or 20
400
1.51 Meg
10 Meg
With Standoff
Ref. Case "A" Dwg.
TK621
200
5, 10 or 20
300
501 K
2 Meg
Ref. Case "B" Dwg.
TK633
300
5, 10 or 20
400
1.51 Meg
10 Meg
Ref. Case "C" Dwg.
TK639
300
5, 10 or 20
400
1.51 Meg
10 Meg
TK600
Series
TK100
Series
Transfer Molded
Transfer Molded
Transfer Molded
Transfer Molded
Transfer Molded
Transfer Molded
Transfer Molded
Transfer Molded
Tinned Copper
Tinned Copper
Tinned Copper
Tinned Copper
Tinned Copper
Tinned Copper
Tinned Copper
Case "A"
Model TK133V and TK633V
.025 ±.002
(.64 ±.05) DIA.,
LEADWIRE OFFSET
.012 (.31) FROM
CENTERLINE
.250
±1.27)
±.050
(6.35
.290
±.010
(7.37
±.26)
.200 ±.015
(5.08 ±.38)
(CENTERED)
10.0 MEG
TK633V
0.1%
.090
(2.29)
.030 ±.004
(.76 ± .10)
.095 ±.005
(2.41 ±.13)
.290 ±.010
(7.37 ±.26)
Model TK139 and TK639
.305
±.010
(7.75
±.26)
.105 ±.005
(2.67 ±.13)
.305 ±.010
(7.75 ±.26)
.025 ±.002
(.64 ±.05) DIA.,
LEADWIRE
OFFSET
.012 (.31)
FROM
CENTERLINE
10.0 MEG
TK639
0.1%
1.50
+3.18)
-0.00)
+.125
-.000
.150 ±.015
(3.81 ±.38)
(CENTERED)
(38.10
Case "C"
Case "D"
Derating Curve:
RATED LOAD, %
AMBIENT TEMPERATURE, °C
100
80
60
40
20
025 75 125 175 225
Type TK Low TC Precision Radial-Lead Film Resistors
Page 2 of 2
Ordering Information:
TK633 - 10.0 Meg - 0.1% - 10 ppm/°C
Model Number
Tolerance
Resistor Value
Temperature
Coefficient
Resistance Tolerance: ±0.1% Standard
(tolerances of ±1% and ±0.05% are available)
Temperature Coefcient: Referenced to
25°C, ∆R taken at -55°C to +125°C.
TC identication is made with a color stripe on
the top edge of the part.
5 ppm/°C White Stripe
10 ppm/°C No Stripe
20 ppm/°C Green Stripe
Overload*:
TK100 Series - 6.25 times rated power for
5 seconds at voltage not to exceed 1.5 times
maximum rated working voltage, ∆R less
than 0.05%.
TK600 Series - 1.5 times rated working voltage
for 5 seconds, ∆R less than 0.2%.
Operating Temperature: -55°C to +175°C.
Thermal Shock:
TK100 Series - Mil-Std-202, Method 107,
Cond. B, ∆R less than 0.05%.
TK600 Series - Mil-Std-202, Method 107,
Cond. B, ∆R less than 0.1%.
Low Temperature Operation*:
TK100 Series - ∆R less than 0.02%.
TK600 Series - ∆R less than 0.05%.
Dielectric Withstanding Voltage*:
TK100 Series - ∆R less than 0.02%.
TK600 Series - ∆R less than 0.05%.
Moisture Resistance*:
Mil-Std-202, Method 106,
1K to 500K ∆R less than 0.05%,
500.1K to 10.0 Meg ∆R less than 0.1%.
Load Life*: 2,000 hours at +125°C.
TK100 Series -
1K to 500K ∆R less than 0.07%,
500.1K to 1.5 Meg ∆R less than 0.1%.
TK600 Series -
1.51 Meg to 10 Meg ∆R less than 0.2%.
Shelf Life (Typical):
TK100 Series - 25 ppm/year.
TK600 Series - 50 ppm/year.
Insulation Resistance: 10,000 Megohms.
Vibration*:
TK100 Series - ∆R less than 0.03%.
TK600 Series - ∆R less than 0.05%.
Shock*: ∆R less than 0.05%.
*Test methods per procedures of
Mil-PRF-55182/9.
DIMENSIONS IN INCHES AND (MILLIMETERS)
