0402CS-R12XJRW

0402CS-R12XJRW is a low-value current-sense resistor in a 0402 (1.0 × 0.5 mm) SMD package. The “R12” denotes a nominal 0.12 Ω resistance; “J” indicates ±5% tolerance. The “X” is the temperature-coefficient class, and “RW” signifies RoHS-compliant, lead-free terminations. It’s used to sense current by generating a small voltage drop with minimal effect on circuit performance, common in DC-DC converters, motor drivers, and battery-management circuits. The 0402 form factor supports compact boards and standard reflow soldering. Exact specs (power rating, max current, TCR, operating temperature) vary by manufacturer and variant, so consult the specific datasheet for precise figures.

0402CS-R12XJRW is a 0402-format 0.12 Ω SMD resistor (low‑ohm/current‑sense). Equivalent parts are any 0402, 0.12 Ω thick‑film/current‑sense resistors from major vendors—e.g. Vishay (CRCW/AC series in 0402 0.12 Ω), Yageo (RC0402 0.12 Ω), Rohm (MCR0402 0.12 Ω), Susumu and Panasonic 0402 0.12 Ω SMD resistors. Match power rating, tolerance and TCR when selecting the exact replacement.

Here are concise features for 0402CS-R12XJRW:
- Value: 0.12 Ω (R12)
- Package: 0402 (imperial), 1005 metric
- Type: current-sense resistor
- Tolerance: ±5% (J)
- Power rating: 1/16 W (≈62.5 mW)
- Terminations: tin-coated Ni barrier, Sn finish
- Temperature range: typically −55°C to +125°C
- RoHS compliant and reflow-solderable
- Suitable for current-sense in DC-DC converters, power management, etc.
Note: For exact specs (TC, exact tolerance class, and any special markings), please consult the official datasheet.

Pin count: 2 (two terminal pads).
Function: 0402CS-R12XJRW is an 0402-size surface-mount low‑ohm resistor (R12 = 0.12 Ω) used as a current‑sense/shunt resistor (two‑terminal passive resistor for measuring or limiting current).

Manufacturer: KOA Speer (KOA Corporation).
What kind of company: KOA is a Japanese manufacturer of passive electronic components, specializing in resistors (including chip/current‑sense resistors), networks, and related discrete passive parts for industrial, automotive, and electronics markets.

0402CS-R12XJRW is a 0402-sized current-sense resistor with 0.12 Ω value.
Typical applications:
- Sensing current in DC-DC converters and power regulators
- Battery charging and battery-management systems (current measurement)
- Motor drive and controller circuits (BLDC/stepper)
- Overcurrent protection and current-limit sensing in power paths
- Load monitoring and instrumentation in compact electronics
- Solar charge controllers and renewable-energy power stages
- General high-side/low-side shunt resistor for precision current measurement on small boards

Package type: 0402 SMD chip resistor (imperial 0.04" × 0.02", metric ≈ 1.0 × 0.5 mm) — standard 0402 surface-mount package.