Product Overview
The Caddock Type SR Precision Current Sense Resistors are designed for efficient current monitoring and control applications. Utilizing Caddock's Micronox resistance films, these resistors offer a compact footprint and non-inductive performance. Key features include Kelvin terminals for accurate four-wire resistance measurements and availability in standard resistance values down to 0.005. They are ideal for applications requiring precise current sensing where minimizing circuit board space is crucial.
Product Attributes
- Brand: Caddock Electronics, Inc.
- Product Type: Precision Current Sense Resistors
- Design: Non-inductive
- Terminal Type: Kelvin Terminals (Four Wire)
- Resistance Film: Micronox
- Encapsulation: Polymer over resistance element
Technical Specifications
| Model | Resistance Min. () | Resistance Max. () | Power Rating at 70C* (Watts) | Voltage Rating (V) | Tolerance | Temperature Coefficient (ppm/C) | Load Life (R) | Thermal Shock (R) | Moisture Resistance (R) |
|---|---|---|---|---|---|---|---|---|---|
| SR10 | 0.005 | 1.00 | 1.0 | Calculated (V = sqrt(PxR)) | 1% | 0 to +300 (0.005 to 0.007 ohm) | (0.2% + 0.00001 ) max. | (0.2% + 0.00001 ) max. | (0.2% + 0.00001 ) max. |
| SR20 | 0.008 | 1.00 | 2.0 | Calculated (V = sqrt(PxR)) | 1% | 0 to +200 (0.008 to 0.024 ohm) | (0.2% + 0.00001 ) max. | (0.2% + 0.00001 ) max. | (0.2% + 0.00001 ) max. |
| 0 to +150 (0.025 to 0.080 ohm) | |||||||||
| -50 to +100 (0.081 to 1.00 ohm) |
Standard Resistance Values:
SR10: 0.005, 0.008, 0.010, 0.012, 0.015, 0.020, 0.025, 0.030, 0.033, 0.040, 0.050, 0.075, 0.10, 0.15, 0.20, 0.25, 0.30, 0.40, 0.50, 0.75, 1.00
SR20: 0.008, 0.010, 0.012, 0.015, 0.020, 0.025, 0.030, 0.033, 0.040, 0.050, 0.075, 0.10, 0.15, 0.20, 0.25, 0.30, 0.40, 0.50, 0.75, 1.00
Dimensions (Inches and Millimeters):
| Model | A (inches ) | B (inches ) | C (inches ) | D (inches ) | E (inches ) | F (inches ) | G (inches ) | H (inches ) |
|---|---|---|---|---|---|---|---|---|
| SR10 | .565 .020 (14.35 .51) | .400 .015 (10.16 .38) | .125 .020 (3.18 .51) | .045 (1.14) | .027 (.69) | .100 (2.54) | .032 .007 (.81 .18) | .090 (2.29) MAX. |
| SR20 | .365 .020 (9.27 .51) | .370 .015 (9.40 .38) | .125 .020 (3.18 .51) | .045 (1.14) | .027 (.69) | .200 (5.08) | .032 .007 (.81 .18) | .090 (2.29) MAX. |
Operating Conditions:
- Operating Temperature: -40C to +150C
- Power Rating Derating: Based on ambient temperature above +70C (see derating curve).
Measurement Note:
Resistance measurements are made using Kelvin connections (four wire) with appropriate current and sense connections to the device terminals.
Circuit Board Layout Note:
Circuit board traces connected to current terminals must be sized appropriately for the current flowing through the trace. For example, a 0.005 resistor operated at 2.0 Watts will have 20 amps flowing through the circuit board traces into the current terminals.
2411111100_Caddock-SR20-0-50-1-_C3203193.pdf
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