Bulk Metal
®
Foil Technology Ultra High Precision Trimming Potentiometers,
1
/
4
" Square, RJ26 Style, Designed to Meet or Exceed The Requirements of
MIL-PRF-39035, Char. H with a Smooth and Unidirectional Output
Accutrim™ 1240 (RJ26 Style)
Vishay Foil Resistors
Document Number: 63053 For any questions, contact: foil@vishaypg.com www.vishayfoilresistors.com
Revision: 16-Oct-13 1
INTRODUCTION
Vishay Foil Resistors’ (VFR) 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.
FEATURES
Temperature coefficient of resistance (TCR):
± 10 ppm/°C. (- 55 °C to + 150 °C ref. at + 25 °C);
through the wiper (3); ± 25 ppm/°C (see table 2 for
low values)
A smooth and unidirectional resistance with
leadscrew adjustment
Load life stability: 0.1 % typical R, 1.0 % maximum R
under full rated power at + 85 °C for 10 000 h
Settability: 0.05 % typical; 0.1 % maximum
Setting stability: 0.1 % typical; 0.5 % maximum, DSS
Power rating: 0.25 W at + 85 °C
Resistance range: 5 to 10 k
Tolerance: ± 5 %, ± 10 %
Electrostatic discharge (ESD) at least to 25 kV
Terminal finish: gold plated (tin/lead finish is available on
request)
CERMET
Wiper Travel
Resistance
Wiper Travel
Resistance
BULK METAL
FOIL WIREWOUND
Wiper Travel
Resistance
TABLE 1 - MODEL SELECTION
MODEL TERMINATION STYLE AVERAGE WEIGHT (g) POWER RATING at + 85 °C AMBIENT NO. OF TURNS
1240
W-edge mount, top adjust
0.4 0.25 W 21 ± 2X-edge mount, side adjust
P-horizontal mount, side adjust
Note
• See Figure 1, next page
TABLE 2 - 1240 (RJ26) SERIES
ELECTRICAL SPECIFICATIONS
Temperature Coefficient of
Resistance (TCR) 50 to 10 k
± 10 ppm/°C maximum
(- 55 °C to + 150 °C,
+ 25 °C ref.)
End-to-end (2)
Temperature Coefficient of
Resistance 5, 10 and 20
± 20 ppm/°C
Through the wiper (3) ± 25 ppm/°C
Stability
Load life at 10 000 h
End-to-end (2)
0.1 % typical R
1.0 % maximum R
(under full rated power of
0.25 W at + 85 °C)
Power Rating (4) 0.25 W at + 85 °C
Settability 0.05 % typical;
0.1 % maximum
Setting Stability 0.1 % typical;
0.5 % maximum
Contact Resistance
Variation - CRV (noise) (5) 3 typical;
10 maximum
Hop-off 0.25 % typical;
1.0 % maximum
High-Frequency Operation
Rise time
Inductance
Capacitance
1.0 ns without ringing
0.08 µH typical
0.5 pF typical
Operating Temperature Range - 55 °C to + 150 °C
TABLE 3 - VALUES VS. TOLERANCES
STANDARD RESISTANCE VALUES
(in )
STANDARD
TOLERANCE
5, 10 ± 10 %
20, 50, 100, 200, 500, 1K, 2K, 5K, 10K ± 5 %
TABLE 4 - MECHANICAL SPECIFICATIONS
Adjustment Turns
21 ±
2
Mechanical Stops
Wiper idles - no discontinuity
Internal
Terminations
All welded - no flux
Case Material
1240X - diallyl-phthalate: green (DAP)
1240W - diallyl-phthalate: green (DAP)
1240P - thermoplastic: black
Shaft Torque
3 oz. in. maximum
Backlash
0.005 % typical
FIGURE 2 - POWER DERATING CURVE
Ambient Temperature °C
+ 85 °C
+ 100
+ 75
+ 50
+ 25
0
Percent of Rated Power
- 75 + 150+ 125+ 100+ 75+ 50+ 250- 25- 50 + 175
FIGURE 3 - 1240W 10 k
LOAD LIFE, 20 UNITS,
10 000 h at 0.25 W, + 85 °C (Wiper at CW)
+ 2000
+ 1500
+ 1000
+ 500
0
- 500
- 1000
- 1500
- 2000
ΔR/R (ppm)
Time (h)
0 2000 4000 8000 10 0006000
FIGURE 1 - SCHEMATIC AND DIMENSIONS in Inches (Millimeters)
1240X
0.050" (1.27 mm) C
0.040" (1.02 mm) C
VFR
2
3
1
CW
0.250" (6.35 mm) D
12 3
0.250" (6.35 mm) D
0.100" (2.54 mm) A
0.100" (2.54 mm) A
0.050" (1.27 mm) C
0.050" (1.27 mm) C
0.175" (4.45 mm) C
0.125" (3.18 mm) C
(bottom view)
1240W
3 12
0.050" (1.27 mm) C
VFR
2
13
CW
0.250" (6.35 mm) D
0.250" (6.35 mm) D
0.100" (2.54 mm) A
0.100" (2.54 mm) A
0.050" (1.27 mm) C
0.050" (1.27 mm) C
0.175" (4.45 mm) C
0.125" (3.18 mm) C
0.040" (1.02 mm) C
0.010" (0.25 mm) A
(bottom view)
Resistance
Value
Tolerance
0.055" (1.40 mm) C
0.050" (1.27 mm) C
VFR
3
1
CW
0.175" (4.45 mm) D
12 3
0.250" (6.35mm) D
0.100" (2.54 mm) A
0.100" (2.54 mm) A
0.035" (0.89 mm) C
0.250" (6.35 mm) D
0.125" (3.18 mm) C
Model No.
Date Code
0.016"
(0.41 mm) A
1240P
TOLERANCES:
A = ± 0.005" (0.13 mm)
C = ± 0.010" (0.25 mm)
D = ± 0.020" (0.51 mm)
STANDARD MARKING:
Model No.
Date Code
Resistance Value
Tolerance
NOTES:
Adjustment screw 0.080" (2.03 mm) diameter with
0.025" (0.64 mm) X 0.030" (0.76 mm) slot. Tolerance on
screw dimensions is ± 0.005" (0.13 mm). Model 1240
has gold plated terminal pins 0.016" (0.41 mm) ± 0.001"
(0.03 mm) diameter, 0.200" (5.08 mm) length minimum.
Accutrim™ 1240 (RJ26 Style)
Vishay Foil Resistors
www.vishayfoilresistors.com For any questions, contact: foil@vishaypg.com Document Number: 63053
2Revision: 16-Oct-13
TABLE 5 - COMPARISON
MIL-PRF-39035/3 CHARACTERISTIC H MODEL 1240 MAXIMUM(6)
TEST GROUP I
Conditioning
Contact resistance variation - CRV (noise)
Immersion
± 1.0 %
± 3.0 % or 3 (7)
No continuous stream of bubbles
± 0.5 %
3 typical, 10 maximum
No continuous stream of bubbles
TEST GROUP I a
Visual and mechanical
Actual effective electrical travel
End resistance
Dielectric withstanding voltage - DWV
Per MIL-STD-202, methods 301 and 105
Atmospheric pressure
Barometric pressure
Insulation resistance
Shaft torque
Thermal shock
Setting stability
No failures
10 to 25 turns
2 % or 2 (7)
600 VAC, 1 min
250 VAC, 1 min
1000 M
3 oz. in. maximum
± 1.0 %
± 1.0 %
No failures
21 ± 2 turns
2 for values 1 k;
5 for values 2 k;
600 VAC, 1 min
250 VAC, 1 min
> 1000 M
3 oz. in. maximum
± 0.5 %
± 0.5 %
TEST GROUP II
Solderability Per MIL-STD-202, method 208 Per MIL-STD-202, method 208
TEST GROUP III
Resistance temperature characteristic - TCR
Moisture resistance
Contact resistance variation - CRV (noise)
± 0.005 %/°C (± 50 ppm/°C)
± 1.0 %
3.0 % or 3 (7)
± 0.001 %/°C (± 10 ppm/°C)
± 0.5 %
3 typical, 10 maximum
TEST GROUP IV
Settability
Shock
Setting stability
Vibration
Setting stability
Contact resistance variation - CRV (noise)
Salt spray
± 1.0 %
± 1.0 %
± 1.0 %
± 1.0 %
± 1.0 %
3.0 % or 3 (7)
No corrosion
± 0.1 %
± 0.5 %
± 0.5 %
± 0.5 %
± 0.5 %
3 typical, 10 maximum
No corrosion
TEST GROUP V
Solder heat
Low-temperature operation
Setting stability
Low-temperature storage
High-temperature exposure
Setting stability
Contact resistance variation - CRV (noise)
Integrity of shaft
± 1.0 %
± 1.0 %
± 2.0 %
± 1.0 %
± 3.0 %
± 2.0 %
3 % or 3 (7)
No loosening or breakage
± 0.1 %
± 0.5 %
± 0.5 %
± 0.5 %
± 0.5 %
± 0.5 %
3 typical, 10 maximum
No loosening or breakage
TEST GROUP VI
Rotational life (200 cycles)
Contact resistance variation - CRV (noise)
Terminal strength
± 2.0 %
3 % or 3 (7)
2 lbs.
± 2.0 %
3 typical, 10 maximum
2 lbs.
TEST GROUP VII
Life (2000 h) at + 85 °C
Life (10 000 h) at + 85 °C
± 3.0 %
± 5.0 %
± 0.1 % typical, ± 1.0 % maximum
± 0.1 % typical, ± 1.0 % maximum
TEST GROUP VIII
Solvent resistance No failures No failures
Accutrim™ 1240 (RJ26 Style)
Vishay Foil Resistors
Document Number: 63053 For any questions, contact: foil@vishaypg.com www.vishayfoilresistors.com
Revision: 16-Oct-13 3
Notes
(1) Maximum is 1.0 % A.Q.L. standard for all specifications except
TCR. (For TCR information, see notes 2 and 3.)
(2) Maximum TCR applies to the 3 (sigma) limit or 99.73 % of a
production lot. (Measured end-to-end with wiper off the element.)
(3) 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.
(4) Derated linearly for full power at + 85 °C to zero power at
+ 150 °C. See Figure 2 on previous page.
(5) Independent of resistance value. 3 maximum available on
special request.
(6) All R’s are measured to the tolerance specified + 0.01 .
(7) Whichever is greater.
Special Available Options:
Special marking
Burn-in and screening operations.
VFR TRIMMERS ARE INSPECTED
100 % for:
•Immersion
• Resistance tolerance check
• End resistance
• Visual-mechanical
• Dynamic tests for continuity, CRV
By sample for:
•TCR
•DWV
TABLE 6 - GLOBAL PART NUMBER INFORMATION
NEW GLOBAL PART NUMBER: Y4053500R000J0L (preferred part number format)
DENOTES PRECISION VALUE CHARACTERISTICS (1)
Y R =
K = k
0 = gold plated termination (lead (Pb)-free)
1 to 999 = custom
PRODUCT CODE TOLERANCE PACKAGING
4053 = 1240W
5053 = 1240X
0053 = 1240P
J= ± 5 %
K= ± 10 %
L = foam/box pack
FOR EXAMPLE: ABOVE GLOBAL ORDER Y4053 500R000 J 0 L:
TYPE: 1240W
VALUE: 500.0
ABSOLUTE TOLERANCE: ± 5.0 %
TERMINATION: gold plated termination (lead (Pb)-free)
PACKAGING: foam/box pack
HISTORICAL PART NUMBER: 1240W 500R00 J B (will continue to be used)
1240W 500R00 J B
MODEL RESISTANCE VALUE TOLERANCE PACKAGING
1240W
1240X
1240P
500R00 = 500.0 J= ± 5 %
K= ± 10 %
B = foam/box pack
Accutrim™ 1240 (RJ26 Style)
Vishay Foil Resistors
www.vishayfoilresistors.com For any questions, contact: foil@vishaypg.com Document Number: 63053
4Revision: 16-Oct-13
Note
(1) For non-standard requests, please contact application engineering.
0535 0R00Y4 J00 L0
Vishay Precision Group
Document No.: 63999
Revision: 27-Apr-2011
www.vishaypg.com
1
Legal Disclaimer Notice
Disclaimer
Legal Disclaimer Notice
Disclaimer
Document No.: 63999
Revision: 27-Apr-2011
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, “Vishay Precision Group”), 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 Vishay Precision Group’s terms and
conditions of purchase, including but not limited to, the warranty expressed therein.
Vishay Precision Group 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, Vishay Precision
Group 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 Vishay Precision Group’s knowledge of typical requirements that
are often placed on Vishay Precision Group 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.
No license, express, implied, or otherwise, to any intellectual property rights is granted by this document, or
by any conduct of Vishay Precision Group.
The products shown herein are not designed for use in life-saving or life-sustaining applications unless
otherwise expressly indicated. Customers using or selling Vishay Precision Group products not expressly
indicated for use in such applications do so entirely at their own risk and agree to fully indemnify Vishay
Precision Group for any damages arising or resulting from such use or sale. Please contact authorized
Vishay Precision Group personnel to obtain written terms and conditions regarding products designed for
such applications.
Product names and markings noted herein may be trademarks of their respective owners.
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Authorized Distributor
Click to View Pricing, Inventory, Delivery & Lifecycle Information:
Vishay Precision Group:
1240W 1K 5% Y505310K0000J0L Y50531K00000J0L Y40532K0000J0L Y00535K00000J0L Y4053100R000J0L
Y40531K0000J0L Y00532K00000J0L Y405310K0000J0L Y40531K00000J0L Y40532K00000J0L Y4053500R000J0L
Y40535K00000J0L Y0053500R000J0L Y5053200R000J0L Y50532K00000J0L Y5053500R000J0L
Y505310R0000K0L Y505350R0000J0L Y00531K00000J0L Y4053500R00J0L Y4053200R000J0L Y00532K0000J0L
Y40535K0000J0L Y40535K00000K0L Y005310K0000J0L Y405320R0000J0L Y405350R0000J0L
