ROHM Launches 0.33 W SDR01 Anti-Surge Resistors in 0402 Size

ROHM has introduced the SDR01 series of high anti-surge chip resistors, delivering a rated power of 0.33 W in the 0402 (1005 metric) size. The company describes this as a class-leading power rating for the package size as of September 2026.

The new resistors are intended for power supply and control circuits where board space is limited but higher power handling and surge resistance are required. ROHM is targeting automotive, industrial and consumer electronics, as well as AI server applications.

0.33 W Rating up to 125°C

ROHM developed the SDR01 series by optimizing the resistive element and electrode designs. The resulting 0.33 W rating is guaranteed up to a rated terminal temperature of 125°C. Putting this power rating into an 0402 package gives designers the option of replacing larger resistors in space-constrained designs. Depending on the circuit requirements, ROHM also sees the potential to consolidate multiple resistors where a higher individual power rating is needed.

The anti-surge construction is intended for circuits where resistors can be exposed to transient events, including power supply circuits and areas around interfaces where surge and ESD resistance are required.

Resistance Stability Across Temperature

Alongside its higher power handling, the SDR01 series has a specified temperature coefficient of resistance of ±100 ppm/°C across resistance values from 10 Ω to 2.2 MΩ. The figure applies to F-class devices with a ±1% resistance tolerance.

TCR describes the change in resistance as temperature varies, making it an important consideration where a circuit needs to maintain a relatively stable resistance value across its operating temperature range.

The combination of the 0402 footprint, 0.33 W rated power and ±100 ppm/°C TCR gives the SDR01 series a broad range of potential uses in compact power supply and control circuits. ROHM specifically identifies automotive, industrial and consumer equipment as target applications.

Mass production of the SDR01 series has begun, and the resistors are available now.

Learn more and read the original announcement at rohm.com.

Technology Overview

The ROHM SDR01 series consists of high anti-surge chip resistors rated at 0.33 W in an 0402 (1005 metric) package. The series maintains its rated power up to a terminal temperature of 125°C and offers a TCR of ±100 ppm/°C from 10 Ω to 2.2 MΩ.

FAQs

What is the power rating of the ROHM SDR01 series?

The SDR01 series is rated at 0.33 W in the 0402 package, with the full rated power guaranteed up to a terminal temperature of 125°C.

What resistance range has a ±100 ppm/°C TCR?

ROHM specifies a TCR of ±100 ppm/°C for resistance values from 10 Ω to 2.2 MΩ on F-class devices with ±1% tolerance.

Where can the SDR01 series be used?

The resistors are intended for power supply and control circuits in automotive, industrial and consumer electronics, as well as AI server applications.