SOIC-8 high-side switch with 250 mOhm Rds(on)
The BSP742RIXUMA1 is a single-channel high-side power switch from Infineon's miniPROFET® family, in a PG-DSO-8-6 package (standard SOIC-8 footprint, 3.90 mm width). It switches a resistive or inductive load on the high side using an N-channel MOSFET with a typical on-resistance of 250 mOhm.
What the 250 mOhm Rds(on) and 400 mA rating mean for your BOM
At 400 mA, the 250 mOhm typical Rds(on) produces a conduction loss of I²R = 40 mW — negligible for the SOIC-8 package's thermal budget, but the junction temperature derating matters: the device is specified over -40°C to 150°C junction, and Rds(on) roughly doubles at 150°C vs 25°C, so actual voltage drop at high temperature is about 200 mV at full load. The 400 mA continuous rating is the DC limit; the miniPROFET architecture handles inrush and short-circuit pulses via fixed current limiting (one of the integrated fault protections), so a lamp or capacitive load starting cold won't latch off as long as the pulse stays within the SOA.
Fault protection set and temperature grade
Protection covers current limiting (fixed threshold), over-temperature shutdown, and over-voltage clamping — no external sense resistor or TVS needed for most automotive load-dump scenarios up to 34 V. The input is non-inverting: logic high turns the switch on.
Sourcing and lifecycle posture
ROHS3 compliant. No official second-source or pin-compatible cross-reference is documented in the Infineon portfolio; the BSP742RIXUMA1 is the standard SOIC-8 variant for this miniPROFET current rating. Available in Tape & Reel (standard production reel) or Cut Tape for prototype quantities.