Sales and Corporate Office
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
© 2004 Caddock Electronics, Inc.
CAD KDOC
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 Coefficient - 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 profile 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.
Building on over 30 years of experience with our unique
complex oxide technology, Caddock has perfected the
Tetrinox® resistance system - the first high resistance system
to provide a TC that is well within 10 ppm/°C and that is also
essentially linear over the entire temperature range from
-55°C to +125°C.
The exceptional performance of Type TK resistors can
achieve improvements in many circuit applications:
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 coefficient 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.
Extended Resistance Range Reduces Power Requirements
Because the Type TK resistors provide resistance values
as high as 10 Megohms - values that are up to 100 times
higher than other types of ultra-low TC resistors - engineers
can now design precision circuits with lower current drain
and lower power requirements.
Low TC of 5 ppm/°C, 10 ppm/°C, or 20 ppm/°C and Resistance Range from 1 Kohm to 10 Megs
Type TK Low TC Precision Radial-Lead Film Resistors
(Photos show
resistors full size)
Ordering Information:
TK633 - 10.0 Meg - 0.1% - 10 ppm/°C
Model Number
Tolerance
Resistor Value
Temperature
Coefficient
Page 1 of 2
28_IL115.1004
Sales and Corporate Office
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
© 2004 Caddock Electronics, Inc.
CAD KDOC
Dimensions
Encap-
sulation
Leadwire
Max.
Working
Voltage
Model
No.
Wattage
@ +125°C
Temperature
Coefficient
ppm/°C
Dielect.
Strength
Limited
by
Maximum
Working
Voltage
Resistance
Min.
Max.
Comments
Ref. Case "D" Dwg.
Transfer
Molded
Tinned
Copper
TK633V
300
5, 10 or 20
400
1.51 Meg
10 Meg
With Standoff
Ref. Case "A" Dwg.
Transfer
Molded
Tinned
Copper
TK621
200
5, 10 or 20
300
501 K
2 Meg
Ref. Case "B" Dwg.
Transfer
Molded
Tinned
Copper
TK633
300
5, 10 or 20
400
1.51 Meg
10 Meg
Ref. Case "C" Dwg.
Transfer
Molded
Tinned
Copper
TK639
300
5, 10 or 20
400
1.51 Meg
10 Meg
Ref. Case "E" Dwg.
Transfer
Molded
Gold
Plated
TK634
300
5, 10 or 20
400
1.51 Meg
10 Meg
Resistance Tolerance: ±0.1% (tolerances
of ±1% and ±0.05% on special order).
Operating Temperature: -55°C to +175°C.
TC Temperature Range: -55°C to +125°C.
Overload*: 6.25 times rated power for 5
seconds at voltage not to exceed 1.5 times
maximum rated working voltage, ΔR less
than 0.05%.
Temperature Coefficient
identified with color stripe
on the top edge of the part:
5 ppm/°C White Stripe
10 ppm/°C No Stripe
20 ppm/°C Green Stripe
Type TK Low TC Precision Radial-Lead Film Resistors - Standard Resistance Range
Resistance Tolerance: ±0.1% (tolerances
of ±1% and ±0.05% on special order).
Operating Temperature: -55°C to +175°C.
TC Temperature Range: -55°C to +125°C.
Overload*: 1.5 times rated working voltage
for 5 seconds, ΔR less than 0.2%.
Thermal Shock: Mil-Std-202, Method 107,
Cond. B, ΔR less than 0.1%.
Low Temperature Operation*: ΔR less
than 0.05%.
Dielectric Withstanding Voltage*: ΔR less
than 0.05%.
Moisture Resistance*: Mil-Std-202,
Method 106, ΔR less than 0.10%.
Type TK Low TC Precision Radial-Lead Film Resistors - Extended Resistance Range
DIMENSIONS IN INCHES AND (MILLIMETERS)
Case "B"
Load Life*: 2,000 hours at +125°C,
ΔR less than 0.2%.
Shelf Life (Typical): 50 ppm/year.
Insulation Resistance: 10,000 Megohms.
Vibration*: ΔR less than 0.05%.
Shock*: ΔR less than 0.05%.
*Test methods per procedures of
Mil-PRF-55182/9.
Thermal Shock: Mil-Std-202, Method 107,
Cond. B, ΔR less than 0.05%.
Low Temperature Operation*: ΔR less
than 0.02%.
Dielectric Withstanding Voltage*: ΔR less
than 0.02%.
Moisture Resistance*: Mil-Std-202,
Method 106, 1K to 500K ΔR less than 0.05%,
500.1K to 1.5 Meg ΔR less than 0.10%.
Resistance
Min.
Max.
Dimensions
Encap-
sulation
Leadwire
Max.
Working
Voltage
Model
No.
Wattage
@ +125°C
Temperature
Coefficient
ppm/°C
Dielect.
Strength
Comments
Ref. Case "D" Dwg.
Transfer
Molded
Tinned
Copper
TK133V
0.3
300
5, 10, or 20
400
1 K
1.5 Meg
With Standoff
Ref. Case "B" Dwg.
Transfer
Molded
Tinned
Copper
TK133
0.3
300
5, 10, or 20
400
1 K
1.5 Meg
Ref. Case "A" Dwg.
Transfer
Molded
Tinned
Copper
TK121
0.2
200
5, 10, or 20
300
1 K
500 K
Ref. Case "E" Dwg.
Transfer
Molded
Gold
Plated
TK134
0.3
300
5, 10, or 20
400
1 K
1.5 Meg
Ref. Case "C" Dwg.
Transfer
Molded
Tinned
Copper
TK139
0.3
300
5, 10, or 20
400
1 K
1.5 Meg
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 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 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
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%
Load Life*: 2,000 hours at +125°C,
1K to 500K ΔR less than 0.07%,
500.1K to 1.5 Meg. ΔR less than 0.10%.
Shelf Life (Typical): 25 ppm/year.
Insulation Resistance: 10,000 Megohms.
Vibration*: ΔR less than 0.03%.
Shock*: ΔR less than 0.05%.
*Test methods per procedures of
Mil-PRF-55182/9.
Temperature Coefficient
identified with color stripe
on the top edge of the part:
5 ppm/°C White Stripe
10 ppm/ °C No Stripe
20 ppm/ °C Green Stripe
Case "E"
Type TK Low TC Precision Radial-Lead Film Resistors
Page 2 of 2
28_IL115.1004