Accutrim™ 1280G, 1285G
Vishay Foil Resistors
Bulk Metal® Foil Technology Ultra High Precision
Trimming Potentiometers 3/4" Rectilinear, ± 5 ppm/°C and
± 15 ppm/°C TCR with a Smooth and Unidirectional Output
FEATURES
• Temperature coefficient of resistance (TCR):
(- 55 °C to + 125 °C ref. at + 25 °C)
- ± 15 ppm/°C (model 1280G);
- ± 5 ppm/°C (model 1285G)3);
- through the wiper ± 50 ppm/°C
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.
• A smooth and unidirectional resistance with leadscrew
adjustment
• Load life stability: 0.5 % maximum ΔR under full rated
power at + 25 °C for 2000 h
• Electrostatic discharge (ESD) up to 25 000 V
• Settability: 0.05 % typical; 0.1 % maximum
• Setting stability: 0.1 % typical; 0.5 % maximum, ΔSS
BULK METAL
FOIL
• Resistance range: 10 Ω to 20 kΩ
Resistance
Resistance
• Power rating: 0.75 W at + 25 °C
WIREWOUND
Wiper Travel
• Resistance tolerance: ± 10 %, ± 5 %
• Backlash: < 0.05 %
• Tap test: 0.05 % typical; 0.1 % maximum
Wiper Travel
• “O”-ring prevents ingress of fluids during any board
cleaning operation
Resistance
• Terminal finish: gold plated (tin/lead finish available on
request)
CERMET
Wiper Travel
TABLE 1 - 1280G AND 1285G SERIES ELECTRICAL SPECIFICATIONS
Resistance Tolerance
Model 1280G 10 % (1), Model 1285G 5 %
Resistance Range
10 Ω to 20 kΩ
TCR Model 1280G
± 15 ppm/°C (- 55 °C to + 125 °C, ref. + 25 °C)
TCR Model 1285G (3)
± 5 ppm/°C (- 55 °C to + 125 °C, ref. + 25 °C)
Power
0.75 W at + 25 °C derated linearly to 0 W at + 125 °C (see Fig. 2)
Settability
0.05 % typical; 0.1 % maximum
Setting Stability
0.1 % typical; 0.5 % maximum
Roll-on, Roll-off
0.25 % typical; 1.0 % maximum
Load Life Stability
0.5 % ΔR after 2000 h under full rated power at + 25 °C
End Resistance
2 Ω maximum
C.R.V. (noise) (2)
3 Ω typical; 10 Ω maximum
Frequency Characteristics
10 ns rise time at 1 kΩ to 100 MHz
Notes
(1) 5 % available on special order
(2) The 1280G can be screened for low noise, if required
(3) For model 1285G 10 Ω and 20 Ω TCR is ± 10 ppm/°C
(4) Panel mount available on special order
TABLE 2 - STANDARD VALUE
10 Ω, 20 Ω, 50 Ω, 100 Ω, 200 Ω, 500 Ω, 1 kΩ, 2 kΩ, 5 kΩ, 10 kΩ, 20 kΩ
Document Number: 63056
Revision: 25-Mar-10
For any questions, contact: foil@vishaypg.com
www.foilresistors.com
1
Accutrim™ 1280G, 1285G
Vishay Foil Resistors
TABLE 3 - 1280G AND 1285G SERIES MECHANICAL SPECIFICATIONS
Adjustment Turns
26 ± 2 turns
Backlash
< 0.05 %
Stops
clutch, wiper idles
Sealed
+ 85 °C water immersion
Torque
5 oz. in. maximum
Weight
1.5 grams maximum
Construction
Case Material
Lead Screw
Wiper
Rider Block
Element
Lead Material
Valox®
Brass
Precious metal brush
Nylon
Bulk Metal® Foil
Gold plated phosphor bronze
FIGURE 1 - 1280G/1285G SCHEMATIC AND DIMENSIONS in Inches (Millimeters)
0.060"
(1.52 mm) A
0.750" (19.05 mm) C
0.190"
(4.83 mm) B
0.110"
(2.79 mm) A
0.190"
(4.83 mm) B
0.010"
(0.25 mm) A
1
2
0.030"
(0.76 mm) A
0.270"
(6.86 mm) B
3
0.200"
(5.08 mm) B
0.050"
(1.27 mm) A
0.039" (0.99 mm) A
0.010"
(0.25 mm) A
0.200"
(5.08 mm) A
0.020" (0.51 mm) A
0.100"
(2.54 mm) B
0.125"
(3.18 mm) B
0.500" (12.70 mm) A
1
3
CW
2
0.030"
(0.76 mm) A
TOLERANCES:
A = ± 0.005" (0.13 mm)
B = ± 0.010" (0.25 mm)
C = ± 0.015" (0.38 mm)
FIGURE 2 - POWER DERATING CURVE
+ 25 °C
Percent of Rated Power
- 55 °C
+ 100
+ 75
+ 50
+ 25
0
- 75
- 50
- 25
0
+ 25
+ 50
+ 75
+ 100
+ 125
+ 150
Ambient Temperature (°C)
www.foilresistors.com
2
For any questions, contact: foil@vishaypg.com
Document Number: 63056
Revision: 25-Mar-10
Accutrim™ 1280G, 1285G
Vishay Foil Resistors
TABLE 4 - GLOBAL PART NUMBER INFORMATION
NEW GLOBAL PART NUMBER: Y0056100R000K0L (preferred part number format)
DENOTES PRECISION
VALUE
CHARACTERISTICS (1)
Y
R=Ω
K = kΩ
0 = gold plated termination (lead (Pb)-free)
1 to 999 = custom
Y
0
0
5
6
1
0
0
R
0
0
0
K
0
PRODUCT CODE
RESISTANCE TOLERANCE
PACKAGING
0056 = 1280G
0059 = 1285G
J = ± 5.0 %
K = ± 10.0 %
L = foam/box pack
L
FOR EXAMPLE: ABOVE GLOBAL ORDER Y0056 100R000 K 0 L:
TYPE: 1280G
VALUES: 100.0 Ω
ABSOLUTE TOLERANCE: ± 10 %
TERMINATION: gold plated (lead (Pb)-free)
PACKAGING: foam/box pack
HISTORICAL PART NUMBER: 1280G 100R K (will continue to be used)
1280G
100R
K
MODEL
VALUE
TOLERANCE
1280G
1285G
100R = 100 Ω
J = ± 5.0 %
K = ± 10.0 %
Note
(1) For non-standard requests or additional values, please contact application engineering.
Document Number: 63056
Revision: 25-Mar-10
For any questions, contact: foil@vishaypg.com
www.foilresistors.com
3
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
VPG prior to performing installation or use of the product, such as on our website at vpgsensors.com.
No license, express, implied, or otherwise, to any intellectual property rights is granted by this document, or by any
conduct of VPG.
The products shown herein are not designed for use in life-saving or life-sustaining applications unless otherwise
expressly indicated. Customers using or selling VPG products not expressly indicated for use in such applications do
so entirely at their own risk and agree to fully indemnify VPG for any damages arising or resulting from such use or sale.
Please contact authorized VPG 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.
Copyright Vishay Precision Group, Inc., 2014. All rights reserved.
Document No.: 63999
Revision: 15-Jul-2014
www.vpgsensors.com
1
