Accutrim™ 1202
Vishay Foil Resistors
Bulk Metal
®
Foil Ultra High Technology Precision Trimming Potentiometers,
1
1
/
4
" Rectilinear, RJ12 Style, Designed to Meet or Exceed The Requirements
of MIL-PRF-22097, Char. F with Smooth and Unidirectional Output
FEATURES
•
Temperature coefficient of resistance (TCR):
± 10 ppm/°C maximum
(3)
(- 55 °C to + 150 °C ref. at + 25 °C);
through the wiper
(4)
; ± 25 ppm/°C
•
A smooth and unidirectional resistance with
leadscrew adjustment
•
Load life stability: 0.1 % typical
ΔR,
0.5 % maximum
ΔR
under full rated power at + 85 °C for 2000 h
•
Settability: 0.05 % typical; 0.1 % maximum
•
Setting stability: 0.1 % typical; 0.5 % maximum,
ΔSS
•
Power rating: 0.5 W at + 85 °C
•
Resistance range: 2
Ω
to 20 kΩ
•
“O“-ring prevents ingress of fluids during any board
cleaning operation
•
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
TERMINATION
STYLE
P-In line PC pins
Y-staggered PC pins
(1)
L-flexible wire leads
LB-flexible wire leads
with bushings
AVERAGE
WEIGHT
(g)
2.5
2.5
3.3
5.1
POWER
RATING
at + 85 °C
AMBIENT
NO. OF
TURNS
TABLE 2 - VALUES VS. TOLERANCES
STANDARD RESISTANCE
VALUES (in
Ω)
2, 5, 10
0.5 W
25 ± 2
20, 50, 100, 200, 250, 500,
1K, 2K, 5K, 10K, 20K
STANDARD TOLERANCES
± 10 %
(2)
, ± 20 %
1202
5 %, 10 %
Note
• See Figures 1 and 2
TABLE 3 - 1202 (RJ12) SERIES ELECTRICAL SPECIFICATIONS
Temperature Coefficient of Resistance (TCR), 50
Ω
and up
± 10 ppm/°C maximum (- 55 °C to + 25 °C)
End-to-end
(3)
± 10 ppm/°C maximum (+ 25 °C to + 150 °C)
2
Ω,
5
Ω,
10
Ω,
20
Ω
± 20 ppm/°C (- 55 °C to + 150 °C, ref. + 25 °C)
Through the wiper
(4)
± 25 ppm/°C (- 55 °C to + 150 °C, ref. + 25 °C)
Stability
Load life at 2000 h, under full rated power of 0.5 W at + 85 °C
0.1 % typical
ΔR;
0.5 % maximum
ΔR
Load life at 10 000 h, under full rated power of 0.5 W at + 85 °C
0.1 % typical
ΔR;
1.0 % maximum
ΔR
(5)
0.5 W at + 85 °C
Power Rating
0.05 % typical; 0.1 % maximum
Settability
Setting Stability
0.1 % typical; 0.5 % maximum
Contact Resistance
variation - CRV (noise)
3
Ω
typical; 10
Ω
maximum
Hop-off
0.25 % typical; 1.0 % maximum
High-Frequency Operation
to 100 MHz
Rise time
10 ns at 1 kΩ
Inductance
0.08 µH typical
Capacitance
0.5 pF typical
Operating Temperature Range
- 55 °C to + 150 °C
Note
• Refer to page 4 for footnotes
* Pb containing terminations are not RoHS compliant, exemptions may apply
Document Number: 63055
Revision: 25-Mar-10
For any questions, contact:
foil@vishaypg.com
www.foilresistors.com
1
Accutrim™ 1202
Vishay Foil Resistors
TABLE 4 - MECHANICAL SPECIFICATIONS
Adjustment Turns
Mechanical Stops
Internal Terminations
25 ± 2
Wiper idles - no discontinuity
All welded - no flux
Case Material
Shaft Torque
Backlash
Glass fortified diallyl-phthalate (DAP); black
8 oz. in. maximum; 3 oz. in. typical
0.05 % typical
FIGURE 1 - SCHEMATIC AND DIMENSIONS
in Inches (Millimeters)
1202P
(In-Line Pins)
(1)
0.125" (3.18 mm) A
0.093" (2.36 mm) DIA (A)
2 Mtg. Holes
1.000" (25.40 mm) C
0.070" (1.78 mm) C
Slot 0.025" (0.64 mm) W x
0.031" (0.79 mm) DP (A)
0.125"
(3.18 mm) A
0.235"
(5.97 mm) C
0.325"
(8.26 mm) A
0.195"
(4.95 mm) A
0.500"
(12.70 mm) C
0.028" (0.71 mm) DIA (B)
3 Pin Type Leads
0.700"
(17.78 mm) C
0.900" (22.86 mm) C
2
1
0.260"
(6.60 mm) C
3
0.125"
(3.18 mm) DIA (A)
2
1
CW
3
Schematic
1.250" (31.75 mm) C
1202Y
(Staggered Pins)
(1)
0.125" (3.18 mm) A
0.093" (2.36 mm) DIA (A)
2 Mtg. Holes
1.000" (25.40 mm) C
0.070" (1.78 mm) C
Slot 0.025" (0.64 mm) W x
0.031" (0.79 mm) DP (A)
0.125"
(3.18 mm) A
0.235"
(5.97 mm) C
0.325"
(8.26 mm) A
0.195"
(4.95 mm) A
0.500"
(12.70 mm) C
0.300" 0.265"
(7.62 mm) C (6.73 mm) C
0.700" (17.78 mm) C
2
0.125"
(3.18 mm) DIA (A)
0.028" (0.71 mm) DIA (B)
3 Pin Type Leads
0.100"
(2.54 mm) C
1
2
CW
1
3
3
1.250" (31.75 mm) C
Schematic
TOLERANCES:
A = ± 0.005" (0.13 mm)
B = ± 0.003" (0.08 mm)
C = ± 0.010" (0.25 mm)
STANDARD MARKING ILLUSTRATION:
Model No., Resistance Value,
Tolerance, TCR
Vishay Date Code
Note
(1)
1
2
CW
3
Pin leads are gold plated nickel which are solderable or weldable.
Schematic
www.foilresistors.com
2
For any questions, contact:
foil@vishaypg.com
Document Number: 63055
Revision: 25-Mar-10
Accutrim™ 1202
Vishay Foil Resistors
FIGURE 2 - SCHEMATIC AND DIMENSIONS
in Inches (Millimeters)
1202L
(Flexible Leads)
0.093" (2.36 mm) DIA (A)
2 Mtg. Holes
3 Color Coded Leads—
# 30 AWG Teflon Coated
Insulated Stranded Wire
1.000" (25.40 mm) C
11.50" (292.10 mm)
Min. Length
G
Y
R
G
Y
R
1.250" (31.75 mm) C
0.125" (3.18 mm) A
0.070" (1.78 mm) C
Slot 0.025" (0.64 mm) W x
0.031" (0.79 mm) DP (A)
0.125"
(3.18 mm) A
0.235"
(5.97 mm) C
0.325"
(8.26 mm) A
0.195"
(4.95 mm) A
0.125"
(3.18 mm) DIA (A)
R
CW
Y
Schematic
G
1202LB
(Panel Mounted)
0.093" (2.36 mm) DIA (A)
2 Mtg. Holes
3 Color Coded Leads—
# 30 AWG Teflon Coated
Insulated Stranded Wire
1.000" (25.40 mm) C
11.50" (292.10 mm)
Min. Length
G
Y
R
0.125" (3.18 mm) C
0.325"
(8.26 mm) A
0.125" (3.18 mm) A
0.042" (1.07 mm) B
0.280" (7.11 mm) B
# 10 - 32 N.C. - 2
0.400"
0.235"
(10.16 mm) A
(5.97 mm) A
0.300"
(7.62 mm) A
Slot:
0.025" (0.64 mm) W x
0.031" (0.79 mm) DP (A)
1.250" (31.75 mm) C
G
Y
R
Rubber Gasket
Lockwasher
Hexnut
R
0.195"
(4.95 mm) A
CW
Y
Schematic
G
TOLERANCES:
A = ± 0.005" (0.13 mm)
B = ± 0.003" (0.08 mm)
C = ± 0.010" (0.25 mm)
Standard marking shown on previous page.
FIGURE 3 - 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
Document Number: 63055
Revision: 25-Mar-10
For any questions, contact:
foil@vishaypg.com
www.foilresistors.com
3
Accutrim™ 1202
Vishay Foil Resistors
TABLE 5 - COMPARISON
MIL-PRF-22097/2 CHARACTERISTIC F
(7)
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)
(8)
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 (excluding terminations L and LB)
Immersion (excluding terminations L and LB)
TEST GROUP VIII
Fungus
Notes
(1)
1202 MAXIMUM (Worst Case)
No failures
± 10 %
25 ± 2 turns
2
Ω
3
Ω
typical, 10
Ω
maximum
900 V
AC
, 1 min
350 V
AC
, 1 min
≥
1000 MΩ
8 oz. in. maximum
± 1.0 %
± 0.001 % (± 10 ppm/°C)
± 0.5 %
3
Ω
typical, 10
Ω
maximum
± 0.5 %
± 0.5 %
3
Ω
typical, 10
Ω
maximum
No corrosion
± 0.05 %
± 0.5 %
3
Ω
typical, 10
Ω
maximum
± 0.5 %
± 0.5 %
3
Ω
typical, 10
Ω
maximum
± 2.0 %
3
Ω
typical, 10
Ω
maximum
2 lbs
MIL-STD-202 method 208
No continuous stream of bubbles
MIL-STD-810 method 508
No mechanical damage
No failures
± 10 %
17 to 27 turns
± 2 % or 20
Ω
(7)
± 3.0 % or 3
Ω
(7)
900 V
AC
, 1 min
350 V
AC
, 1 min
≥
1000 MΩ
8 oz. in. maximum
± 1.0 %
± 0.01 % (± 100 ppm/°C)
± 1.0 %
3.0 % or 3
Ω
(7)
± 1.0 %
± 1.0 %
± 3.0 % or 3
Ω
(7)
No corrosion
± 1.0 %
± 2.0 %
± 3.0 % or 3
Ω
(7)
± 1.0 %
± 2.0 %
± 3.0 % or 3
Ω
(7)
± 2.0 %
± 3.0 % or 3
Ω
(7)
2 lbs
MIL-STD-202 method 208
No continuous stream of bubbles
MIL-STD-810 method 508
No mechanical damage
(2)
(3)
(4)
(5)
(6)
(7)
(8)
Preferred termination style for current 1-1/4 inch rectilinear
trimmers (staggered PC pins present a sturdier mounting
arrangement for shock, vibration, and impact situations).
10
Ω
at ± 5 % available on special order.
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.)
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 3 is a 2
σ
distribution typifying the behavior of the device when used with
40 % or more of the total resistance in use.
Derated linearly from full power at + 85 °C to zero power at
+ 150 °C. See Figure 3 in this datasheet.
All
ΔR’s
are measured to the tolerance specified + 0.01
Ω.
Whichever is greater.
Load-Life test performed at nominal rated power, 0.5 W, at
+ 85 °C.
Special Available Options:
Special marking
Special lengths for lead wires (L, LB Style)
Hooked leads
Alternate bushing and PC combinations
Power conditioning and screening operations
VISHAY TRIMMERS ARE INSPECTED
100 % for:
• Immersion
• Resistance tolerance check
• End resistance
• Visual-mechanical
• Dynamic tests for continuity, CRV
By sample for:
• TCR
• DWV
Document Number: 63055
Revision: 25-Mar-10
www.foilresistors.com
4
For any questions, contact:
foil@vishaypg.com
Accutrim™ 1202
Vishay Foil Resistors
Circuit A is a conventional circuit employing a high value wire
wound trimmer (4) linearized by two padding resistors (1 and
2) for the purpose of trimming resistor (3) to within less than
100 ppm absolute resistance.
1
3
2
4
Circuit B uses only a low value infinite resolution Vishay
trimming potentiometer (5) to accomplish the same results.
Saving in cost and board space is achieved. A low value wire
wound trimmer cannot be used because of poor resolution.
3
5
Circuit A
Circuit B
TABLE 6 - GLOBAL PART NUMBER INFORMATION
NEW GLOBAL PART NUMBER: Y5050500R000K0L (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
5
0
5
0
5
0
0
R
0
0
0
K
0
L
PRODUCT CODE
5050
= 1202L
0050
= 1202LB
0051
= 1202P
6050
= 1202PB
5051
= 1202Y
7050
= 1202YB
TOLERANCE
J
=±5%
K
= ± 10 %
M
= ± 20 %
PACKAGING
L
= foam/box pack
FOR EXAMPLE: ABOVE GLOBAL ORDER Y5050 500R000 K 0 L:
TYPE: 1202L
VALUE: 500.0
Ω
ABSOLUTE TOLERANCE: ± 10.0 %
TERMINATION: gold plated (lead (Pb)-free)
PACKAGING: foam/box pack
HISTORICAL PART NUMBER: 1202L 500R00 K B (will continue to be used)
1202L
MODEL
1202L
1202LB
1202P
1202PB
1202Y
1202YB
Note
(1)
500R00
RESISTANCE VALUE
500.0
Ω
K
TOLERANCE
J
=±5%
K=
± 10 %
M=
± 20 %
B
PACKAGING
B
= bulk pack
For non-standard requests, please contact application engineering.
Document Number: 63055
Revision: 25-Mar-10
For any questions, contact:
foil@vishaypg.com
www.foilresistors.com
5
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