Panasonic ERJ-3BQF1R5V 1.5 ohm 1% 0.25W 0603 Automotive Current Sense SMD Resistor 50 PCS

Panasonic ERJ-3BQF1R5V thick-film surface-mount resistor rated 1.5 ohms, ±1% tolerance, and 0.25 W / 1/4 W in the 0603 / 1608 metric package.

This is a higher-power 0603 resistor specifically characterized for automotive AEC-Q200 and current-sense applications. Digi-Key lists the exact part as a 1.5-ohm, 1% tolerance, 0.25 W current-sense thick-film resistor with an operating temperature range of -55°C to +155°C and approximately ±200 ppm/°C temperature coefficient. :chatgpt-content-reference{index="0"}

Its low 1.5-ohm resistance and relatively high power rating make it useful in current monitoring, load sensing, power-management circuitry, protection networks, biasing, regulator support, and other circuits where a low resistance value must handle more power than a conventional small-signal 0603 resistor.

Original Digi-Key packaging identifies Panasonic ERJ-3BQF1R5V, 1.5 ohms, 1% tolerance, 1/4 W, 0603 package, and country of origin Japan.

Lifecycle: ACTIVE. Digi-Key currently lists the exact ERJ-3BQF1R5V as an active Panasonic Industry part. :chatgpt-content-reference{index="1"}

HISTORICAL BACKGROUND: Panasonic traces its origins to 1918, when Konosuke Matsushita founded the company that later became one of Japan’s largest electronics manufacturers. Panasonic developed extensive component operations alongside its consumer electronics business, including resistors, capacitors, relays, switches, sensors, batteries, semiconductors, and industrial electronic components.

The ERJ series became one of Panasonic’s major surface-mount resistor families as electronics manufacturing transitioned toward automated PCB assembly. Thick-film construction uses a resistive material deposited onto a ceramic substrate and trimmed to the required resistance value, producing compact and reliable components suitable for high-volume electronics.

The ERJ-3B family is notable because it combines the compact 0603 package with a 1/4-watt rating and automotive AEC-Q200 qualification. That gives it substantially greater power capability than many ordinary 0603 resistors and makes it useful in low-ohm current-sense and power-control applications. :chatgpt-content-reference{index="2"}

Current-sense resistors are used to develop a small measurable voltage proportional to current flowing through a circuit. Control electronics can then use that voltage for monitoring, regulation, overload detection, battery management, motor control, and power-supply protection.

The 1.5-ohm value sits between traditional signal-resistor and very-low-ohm shunt ranges, making it useful where designers need both measurable voltage drop and meaningful current handling in a compact package.