Accutrim™ 1242 (QPL)
Vishay Foil Resistors
Bulk Metal
®
Foil Technology Ultra High Precision Trimming
Potentiometers, QPL Approved
1
/
4
" Square, Qualified to
MIL-PRF-22097, Char. F, RJ26 with a Smooth and Unidirectional Output
FEATURES
•
Temperature coefficient of resistance (TCR):
±
10 ppm/°C maximum
(4)
(- 55 °C to + 150 °C ref. at
+ 25 °C); through the wiper
(5)
;
±
25 ppm/°C
•
A smooth and unidirectional resistance with leadscrew
adjustment
•
Load life stability: 0.1 % typical
ΔR,
1.0 % maximum
ΔR
under full rated power of 0.25 W at 85 °C for 1000 h
•
Settability: 0.05 % typical; 0.1 % maximum
•
Setting stability: 0.1 % typical; 0.5 % maximum,
ΔSS
•
Power rating: 0.25 W at + 85 °C
•
Resistance range: 20
Ω
to 5 kΩ
•
Resistance tolerance:
±
10 %
•
Electrostatic discharge (ESD) up to 25 000 V
•
Terminal finish: gold plated (tin/lead finish is available on
request)
INTRODUCTION
Vishay Foil precision trimmers have the Bulk Metal
®
Foil
resistive element which possesses a unique inherent
temperature and load life stability. Plus, their advanced
virtually back lash-free adjustment mechanism makes them
easy to set quickly and accurately and keeps the setting
exactly on target.
Resistance
Resistance
BULK METAL
FOIL
WIREWOUND
Resistance
CERMET
Wiper Travel
Wiper Travel
Wiper Travel
TABLE 1 - MODEL SELECTION
MODEL
1242
(RJ26)
Note
• See figure 1
TERMINATION STYLE
W-edge mount, top adjust
X-edge mount, side adjust
AVERAGE
WEIGHT (g)
0.4
STANDARD RESISTANCE
VALUES (in
Ω)
(1)
20, 50, 100, 200, 500,
1K, 2K, 5K
STANDARD
POWER RATING
TOLERANCE
(2)
at + 85 °C AMBIENT
± 10 %
0.25 W
NO. OF
TURNS
21 ± 2
TABLE 2 - 1242 (RJ26) SERIES ELECTRICAL SPECIFICATIONS
Temperature Coefficient of Resistance (TCR), 50
Ω
to 10 kΩ
End-to-end
(4)
Temperature Coefficient of Resistance (TCR), 5
Ω,
10
Ω
and 20
Ω
End-to-end
(4)
Through the wiper
Stability
Load life at 1000 h
Power Rating (at + 85 °C)
(6)
Settability
Setting Stability
Contact Resistance Variation - CRV (noise)
Hop-off
High-Frequency Operation
Rise time
Inductance
Capacitance
Operating Temperature Range
Note
• See page 3 for footnotes
Document Number: 63052
Revision: 23-Mar-10
For any questions, contact:
foil@vishaypg.com
(5)
(3)
± 10 ppm/°C maximum (- 55 °C to + 150 °C, 25 °C ref.)
± 20 ppm/°C
± 25 ppm/°C
0.1 % typical
ΔR
1.0 % maximum
ΔR
(under full rated power of 0.25 W at + 85 °C)
0.25 W
0.05 % typical; 0.1 % maximum
0.1 % typical; 0.5 % maximum
ΔSS
± 3 % or 3
Ω
(7)
0.25 % typical; 1.0 % maximum
1.0 ns without ringing
0.08 µH typical
0.5 pF typical
- 55 °C to + 150 °C
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Accutrim™ 1242 (QPL)
Vishay Foil Resistors
TABLE 3 - MECHANICAL SPECIFICATIONS
Adjustment Turns
Mechanical Stops
Internal Terminations
Case Material
Shaft Torque
Backlash
21 ± 2
Wiper idles - no discontinuity
All welded - no flux
Diallyl-phthalate: green (DAP)
3 oz. in. maximum
0.005 % typical
FIGURE 1 - SCHEMATIC AND DIMENSIONS
in Inches (Millimeters)
1242W
0.040" (1.02 mm) C
0.040" (1.02 mm) C
VISHAY
0.250" (6.35 mm) D
CW
3
1
2
STANDARD MARKING:
Model No.
Date Code
Resistance Value
Tolerance
3
2
1
0.250" (6.35 mm) D
0.050" (1.27 mm) C
0.100" (2.54 mm) A
0.175" (4.45 mm) C
0.050" (1.27 mm) C
0.100" (2.54 mm) A
0.125" (3.18 mm) C
NOTES:
Adjustment screw 0.070"
(1.78 mm) diameter with
0.020" (0.51 mm) X 0.020"
(0.51 mm) slot. Model 1242
has gold plated terminal
pins 0.016" (0.41 mm) ± 0.001"
1242X
0.040" (1.02 mm) C
0.250" (6.35 mm) D
VISHAY
1
CW
1
2
3
0.050" (1.27 mm) C
0.050" (1.27 mm) C
0.100" (2.54 mm) A
0.050" (1.27 mm) C
0.100" (2.54 mm) A
0.125" (3.18 mm) C
0.175" (4.45 mm) C
2
3
(0.03 mm) diameter, 0.200"
(5.08 mm) length minimum.
TOLERANCES:
A = ± 0.005" (0.13)
C = ± 0.010" (0.25)
D = ± 0.020" (0.51)
0.250" (6.35 mm) D
FIGURE 2 - POWER DERATING CURVE
Percent of Rated Power
+ 100
+ 75
+ 50
+ 25
0
- 75
+
85
°C
- 50
- 25
0
+ 25
+ 50
+ 75 + 100 + 125 + 150 + 175
Ambient Temperature °C
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Document Number: 63052
Revision: 23-Mar-10
Accutrim™ 1242 (QPL)
Vishay Foil Resistors
TABLE 4 - COMPARISON
MIL-PRF-22097/5 CHARACTERISTIC F
(8)
TEST GROUP I
Visual and mechanical
Total resistance
Actual effective electrical travel
End resistance
Contact resistance variation - CRV (noise)
Dielectric withstanding voltage - DWV
Per MIL-STD-202, methods 301 and 105
Atmospheric pressure
Barometric pressure
Insulation resistance
Shaft torque
Thermal shock
TEST GROUP II
Resistance temperature characteristic - TCR
Moisture resistance
Contact resistance variation - CRV (noise)
TEST GROUP III
Shock (specified pulse)
Vibration (high-frequency)
Contact resistance variation - CRV (noise)
Salt spray
TEST GROUP IV
Solder heat
Life (1000 h at 85 °C)
Contact resistance variation - CRV (noise)
TEST GROUP V
Low-temperature operation
High-temperature exposure
Contact resistance variation - CRV (noise)
TEST GROUP VI
Rotational life
Contact resistance variation - CRV (noise)
Terminal strength
TEST GROUP VII
Solderability
Immersion
TEST GROUP VIII
Fungus
MIL-STD-202 method 208
No continuous stream of bubbles
MIL-STD-810 method 508
No mechanical damage
MIL-STD-202 method 208
No continuous stream of bubbles
MIL-STD-810 method 508
No mechanical damage
± 2.0 %
± 3.0 % or 3
Ω
(7)
2 lbs.
± 2.0 %
± 3.0 % or 3
Ω
(7)
2 lbs.
± 1.0 %
± 2.0 %
± 3.0 % or 3
Ω
(7)
± 0.5 %
± 0.5 %
± 3.0 % or 3
Ω
(7)
± 1.0 %
± 2.0 %
± 3.0 % or 3
Ω
(7)
(RJ26) 1242 SPECIFICATIONS
No failures
± 10 %
21 ± 2 turns
2
Ω
(values
≤
1 kΩ) ; 5
Ω
(values
≥
2 kΩ)
± 3.0 % or 3
Ω
(7)
No failures
± 10 %
10 to 25 turns
± 2 % or 20
Ω
(7)
± 3.0 % or 3
Ω
(7)
600 V
AC
, 1 min
250 V
AC
, 1 min
> 1000 MΩ
3 oz. in. maximum
± 1.0 %
± 0.01 %/°C (± 100 ppm/°C)
± 1.0 %
± 3.0 % or 3
Ω
± 1.0 %
± 1.0 %
± 3.0 % or 3
Ω
(7)
No corrosion
(7)
600 V
AC
, 1 min
250 V
AC
, 1 min
> 1000 MΩ
3 oz. in. maximum
0.1 % typical; 0.5 % maximum
± 0.001 %/°C (± 10 ppm/°C)
± 0.5 %
± 3.0 % or 3
Ω
(7)
± 0.5 %
± 0.5 %
± 3.0 % or 3
Ω
(7)
No corrosion
± 0.1 %
± 1.0 %
± 3.0 % or 3
Ω
(7)
Notes
(1)
5
Ω
and 10
Ω
resistance values available on special order.
(2)
5 % resistance tolerance available on special order.
(3)
Maximum is 1.0 % A.Q.L. standard for all specifications except TCR. (For TCR information, see notes 4 and 5.) “Typical” is a designers
reference which represents that 85 % of the lots supplied, over a long period of time, will be at least the figure shown or better.
(4)
Maximum TCR applies to the 3
σ
(sigma) limit or 99.73 % of a production lot. (Measured end-to-end with wiper off the element.)
(5)
Measurements of TCR through the wiper are influenced more by setting stability and the percentage of the total/resistance in use (at the wiper)
than by fundamental resistance change due to temperature alone. The parameter shown in table 2 is a 2 s distribution typifying the behavior
of the device when used with 40 % or more of the total resistance in use.
(6)
Derated linearly from full power at + 85 °C to zero power at + 150 °C. See figure 2 on previous page.
(7)
Whichever is greater.
(8)
All
ΔR’s
are measured to the tolerance specified + 0.01
Ω.
Document Number: 63052
Revision: 23-Mar-10
For any questions, contact:
foil@vishaypg.com
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Accutrim™ 1242 (QPL)
Vishay Foil Resistors
TABLE 5 - GLOBAL PART NUMBER INFORMATION
NEW GLOBAL PART NUMBER: Y0057500R000K0L (preferred part number format)
DENOTES PRECISION
Y
VALUE
R
=
Ω
K
= kΩ
CHARACTERISTICS
(1)
0
= gold plated termination (lead (Pb)-free)
1 to 999
= custom
Y
0
0
5
7
5
0
0
R
0
0
0
K
0
L
PRODUCT CODE
0057
= 1242W
4057
= 1242X
RESISTANCE TOLERANCE
K
= ± 10.0 %
PACKAGING
L
= foam/box pack
FOR EXAMPLE: ABOVE GLOBAL ORDER Y0057 500R000 K 0 L:
TYPE: 1242W
VALUE: 500.0
Ω
ABSOLUTE TOLERANCE: ± 10.0 %
TERMINATION: gold plated (lead (Pb)-free)
PACKAGING: foam/box pack
HISTORICAL PART NUMBER: RJ26 F W 501 (will continue to be used)
RJ26
MODEL
RJ26
F
CHARACTERISTIC
Having specifications
per table 1 of MIL-PRF-22097
(i.e., TCR of 100 ppm/°C,
power rating of 0.25 W at
+ 85 °C and improved
environmental specifications)
W
MOUNTING TYPE
W, PC pins
(edge mount, top adjust)
X, PC pins
(edge mount, side adjust)
501
RESISTANCE VALUE
First 2 digits significant, last
digit represents the number of
zeros (i.e., 501 = 500
Ω)
Note
(1)
For non-standard requests, please contact application engineering.
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Document Number: 63052
Revision: 23-Mar-10
Legal Disclaimer Notice
Vishay Precision Group, Inc.
Disclaimer
ALL PRODUCTS, PRODUCT SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE WITHOUT NOTICE.
Vishay Precision Group, Inc., its affiliates, agents, and employees, and all persons acting on its or their behalf
(collectively, “VPG”), disclaim any and all liability for any errors, inaccuracies or incompleteness contained herein or in
any other disclosure relating to any product.
The product specifications do not expand or otherwise modify VPG’s terms and conditions of purchase, including but
not limited to, the warranty expressed therein.
VPG makes no warranty, representation or guarantee other than as set forth in the terms and conditions of purchase.
To the maximum extent permitted by applicable law, VPG disclaims (i) any and all liability arising out of the
application or use of any product, (ii) any and all liability, including without limitation special, consequential or
incidental damages, and (iii) any and all implied warranties, including warranties of fitness for particular purpose,
non-infringement and merchantability.
Information provided in datasheets and/or specifications may vary from actual results in different applications and
performance may vary over time. Statements regarding the suitability of products for certain types of applications
are based on VPG’s knowledge of typical requirements that are often placed on VPG products. It is the customer’s
responsibility to validate that a particular product with the properties described in the product specification is suitable for
use in a particular application. You should ensure you have the current version of the relevant information by contacting
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Copyright Vishay Precision Group, Inc., 2014. All rights reserved.
Document No.: 63999
Revision: 15-Jul-2014
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