component
FRM121WJR025TM
Public Made by Adomby adom
FOJAN Current Sense Resistors / Shunt Resistors, 1206. Unpolarised two-terminal part: the datasheet prints no pin numbers, so pins 1 and 2 follow the library convention, KiCad symbol/footprint/3D.
3D Model
Open in new tab ↗
Loads when you scroll to it. Unloads after 5 minutes in the background.
Symbol & Footprint
Schematic Symbol
Open full view ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
PCB Footprint
Open full view ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
Datasheet
Open in new tab ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
README
markdownFRM121WJR025TM
FOJAN · Current Sense Resistors / Shunt Resistors · 1206
FRM121WJR025TM from FOJAN, in a 1206. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | 1 | passive | Terminal 1 of an unpolarised resistor; either orientation. |
| 2 | 2 | passive | Terminal 2 of an unpolarised resistor; either orientation. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | FOJAN |
| Package | 1206 |
| Category | Resistors |
| Pins | 2 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Resistance Range (1206, 1 W row) | 1 | 100 | mΩ | 5 | |||
| Tolerance (code J = ±5%) | -5 | 5 | % | 2 | |||
| Temperature Coefficient of Resistance (T.C.R.) | -50 | 50 | ppm/°C | 5 | |||
| Power Rating | P70 | 1 | W | at P70 (70 °C) | 5 | ||
| Rated Current | 31 | A | 5 | ||||
| Max Overload Current | 70 | A | 5 | ||||
| Operating Temperature Range | -55 | 170 | °C | 5 | |||
| Dielectric Withstanding Voltage | 500 | V DC | 2 | ||||
| Resistance change, High Temperature Exposure (Storage) | ΔR | -1 | 1 | % | 170 °C, 1000 h, measured 24 h after test | 6 | |
| Resistance change, Low Temperature Exposure (Storage) | ΔR | -0.5 | 0.5 | % | -55 °C, 1000 h, measured 24 h after test | 6 | |
| Resistance change, Temperature Cycling | ΔR | -0.5 | 0.5 | % | 1000 cycles, -55 °C to 125 °C, measured 24 h after test | 6 | |
| Resistance change, Short time overload | ΔR | -0.5 | 0.5 | % | 5 × rated power for 5 s | 6 | |
| Resistance change, Moisture Resistance | ΔR | -1 | 1 | % | 24 h per cycle, 10 cycles, zero power | 6 | |
| Resistance change, Biased Humidity | ΔR | -0.5 | 0.5 | % | 10% rated power, 85 °C, RH 85%, 1000 h | 6 | |
| Resistance change, Load Life | ΔR | -1 | 1 | % | 1000 h at +70 °C, 1.5 h ON / 0.5 h OFF | 7 | |
| Resistance change, Resistance to Soldering Heat | ΔR | -0.5 | 0.5 | % | 260 ±5 °C solder, 10 ±1 s dwell | 7 | |
| Resistance change, Mechanical Shock | ΔR | -0.5 | 0.5 | % | 100 g, 6 ms half sine | 7 | |
| Resistance change, Resistance to Vibration | ΔR | -0.5 | 0.5 | % | 5 g, 10-2000 Hz, 20 min, 12 cycles per axis | 7 | |
| Resistance change, Board Flex | ΔR | -0.5 | 0.5 | % | Min 2 mm deflection, 60 s | 7 | |
| Resistance change, Thermal Shock | ΔR | -1 | 1 | % | -55 °C / +155 °C, 1000 cycles | 7 | |
| Resistance change, ESD Test | ΔR | -1 | 1 | % | Direct contact ±6 kV; air discharge +12/+16/+25 kV | 7 | |
| Nominal resistance (marking R025) | R | 25 | mΩ | 6 |
CAD (KiCad official)
- Symbol:
FRM121WJR025TM - Footprint:
Resistor_SMD:R_1206_3216Metric - 3D model: 1206 (KiCad packages3D, STEP)
- 3D model files:
frm121wjr025tm-etched.step/frm121wjr025tm-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);frm121wjr025tm.step/frm121wjr025tm.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: FOJAN datasheet (12 pp, sha256
13a1c74e6b23cc10, retrieved 2026-10-17, tier: lcsc) - Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- Extractor: parts-factory
2.0.0/extract_pins, primarytwo-terminal convention(convention), consensusoff(agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish. - CAD: KiCad official libraries (CC-BY-SA 4.0).