5W surface-mount current sense resistors

A new selection of materials has allowed Rohm to add 5W rated current sensing resistors to its 2512 sized (6432 metric) PMR100 series of metal plate shunts, formerly rated at either 2 or 3W only.

They are available in 0.5, 1 and 1.5mΩ.

“Adopting a proprietary trimless structure suppresses the rise in temperature caused by localised current concentration. This allows a wider distance between electrodes – improving the ease of pattern design even with resistances as low as 0.5mΩ,” said Rohm. “A temperature coefficient of resistance of ±75ppm/°C enables reliable, high accuracy current detection.”

Derating starts at 130°C for the 0.5 and 1mΩ resistors, and 125°C for the 1.5mΩ type, decreasing to zero at the maximum temperature of +175°C. Minimum is -65°C.

For automotive use, the parts are certified to ISO9001 / IATF16949, which “corresponds to AEC-Q200”, according to the company.

PR100 Lineup	Rated power	Rated ambient temp	Rated terminal temp	Resistance tolerance	Resistance temperature coefficient	Resistance choice [mΩ]	Temperature range [°C]
PMR100HZP	2W	70°C	–	F (±1%)	±100ppm/°C	3, 4, 5, 6, 7, 8, 9, 10	-55 to +155
	2W	70°C	–	J (±5%)	±100ppm/°C	3, 4, 5, 6, 7, 8, 9, 10	-55 to +155
	3	–	130°C	F (±1%)	±75	1, 2	-65 to +175
	3	–	130°C	J (±5%)	±150	1, 2	-65 to +175
PMR100HZP7	5	–	130	F (±1%)	±75	0.5, 1	-65 to +175
PMR100HZP7	5	–	125	F (±1%)	±75	1.5	-65 to +175