Panasonic ERJ-2RKF5232X 52.3K ohm 1% 0.1W 0402 Automotive SMD Resistor 90 PCS

Panasonic ERJ-2RKF5232X surface-mount thick-film resistor rated 52.3K ohm, ±1% tolerance, in the compact 0402 / 1005 metric package.

This device belongs to Panasonic’s ERJ automotive-grade chip-resistor family and is suitable for precision bias networks, voltage dividers, feedback circuits, pull-up and pull-down networks, signal conditioning, sensor interfaces, and other board-level applications where a non-standard precision resistance value is required.

Original Mouser packaging identifies Panasonic ERJ-2RKF5232X, 0402 size, 52.3K ohm, 1% tolerance, thick-film construction, and AEC-qualified use. The label shows country of origin China and date code 2119.

Lifecycle: ACTIVE.

HISTORICAL BACKGROUND: Panasonic traces its origins to 1918, when Konosuke Matsushita founded the business 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, 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 resistor technology uses a resistive material deposited onto a ceramic substrate and precisely trimmed to achieve the required resistance value.

The 0402 package became increasingly important as electronic systems moved toward smaller, denser circuit boards. At approximately 1.0 x 0.5 mm, this package allows very high component density while still providing reliable performance in modern automated assembly.

The 52.3K-ohm value is a precision E-series resistance often used where exact ratios matter, including voltage-divider networks, amplifier feedback, sensor scaling, bias networks, and control circuits. A ±1% tolerance provides much tighter accuracy than older ±5% general-purpose resistors.

AEC qualification makes this family suitable for demanding environments where temperature variation, vibration, humidity, and long service life are important factors. This makes the part useful not only in automotive electronics but also in industrial, communications, and instrumentation applications.