Low Noise Precision Resistors (UAR)

Precision Low Noise (UAR) Introduction

Token's low noise precision resistors define accuracy.

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  • Precision Low Noise Resistors (UAR)

The high precision (UAR) resistor represents a significant technical advancement in resistive technology, combining low temperature coefficients with high environmental stabilities, and high frequency performance.

Laser beam trimming gives tolerance accuracies from 0.02 % to 1 %.

The precision (UAR) range effectively bridges the gap that has hitherto existed between the high precision, high stability networks or wirewound technology and conventional film technology.

Full lines equate Vishay, IRC, Ohmite, Caddock, Panasonic precision resistors with fast delivery and more competitive price.

The metal film series is RoHS compliant with Pb-free terminations. Detailed specifications, both mechanical and electrical, please contact our sales representative for more information.

Mil-Std-202 Standard :
This standard establishes uniform methods for testing electronic and electrical component parts, including basic environmental tests to determine resistance to deleterious effects of natural elements and conditions surrounding military operations, and physical and electrical tests.

PDF download here Low Noise Precision Resistors (UAR).

Applications :
  • All General Purpose Applications.
  • Medical Electronics, Current Pulse Limiters.
  • Precision Instruments, Telecom, Test and Measurement.
Features :
  • Excellent high frequency performance, industrial grades, RoHS Compliant.
  • Very tight tolerances: down to A2(±0.02%). Exceptionally low noise; typically 0.05 μV/V.
  • 0.125 W to 0.33 W at 85 °C, Electrical Insulation > 1000 MΩ. Very Low temperature coefficient: ±3, ±5, ±10 and ±15 ppm/°C.

Dimensions & Technical Characteristics (UAR)

(UAR) Dimensions - Precision Low Noise Resistors
(UAR) Dimensions
Precision Low Noise Resistors
Type UAR1/4 UAR1/8 UAR1/10
Power Rating at 85°C (W) 0.33 0.25 0.125
Max. Working Voltage (V) 300 300 300
Resistance Range (Ω ) 500.0~1.0M 100.0~1.0M 100.0~1.0M
Dimensions (Unit: mm) L±0.3 14.8 10.0 6.8
D±0.3 5.2 3.7 2.5
A±0.05 0.60 0.60 0.60

(UAR) Specification

Tolerance: ±0.02, ±0.05, ±0.10, ±0.25, ±0.5, ±1.0%
Temp. Coefficient: ±3, ±5, ±10, ±15ppm/°C
Standard Temperature Characteristic: +25 to 85 °C
On Request: -10 to +85 °C
Noise: less than 0.05 μV/V
Voltage Coefficient: less than 0.02 ppm/V
Non Linearity (3. Harm): more than (-100)dB
Thermal Voltage to Copper: 1 ~ 3 μV/°C
Isolations Resistance: 1010Ω

(UAR) Tests According MIL-STD-202

Temperature Cycling: 0.02%
Low Temp. Operation: 0.013%
Short Time Overload: 0.01%
Dielectric Strength: 0.01%
Load Life: 0.04%
Resistance to Soldering Heat: 0.012%
Moisture Test: 0.050%
Shock and Vibrations Test: 0.015%

(UAR) Low Noise Resistors - Order Codes

UAR1/8 210R B C6 P
Part Number
Resistance Value (Ω)
210R 210Ω
2K1 2.1KΩ
21K 21KΩ
Resistance Tolerance (%)
A2 ±0.02%
A5 ±0.05%
B ±0.10%
C ±0.25%
D ±0.5%
F ±1.0%
Temperature coefficient (PPM/°C)
C5 ±15ppm/°C
C6 ±10ppm/°C
C7 ±5ppm/°C
C9 ±3ppm/°C
P Bulk