Is there a pin-compatible replacement for VIPER22ASTR-E?

The VIPER12ASTR-E is in the same family and SO-8 package, making it highly likely to be pin-compatible. However, pin-for-pin functionality should always be confirmed by comparing datasheets.

What risks should I check before replacing VIPER22ASTR-E?

Key risks include power rating, current limit, RDS(on) of the internal MOSFET, and protection feature thresholds. Pinout compatibility must also be verified, especially for cross-vendor parts.

VIPER22ASTR-E Alternatives, Datasheet & Cross Reference | STMicroelectronics

The VIPER22ASTR-E is a popular 730V offline switcher from STMicroelectronics in an SO-8 package. When seeking alternatives, key parameters include the 60kHz switching frequency and power delivery capability.

AI replacement insight

Electrical riskmedium

Power and current limit differences are the main concern.

Package risklow

SO-8 is a standard package with good availability.

Firmware risklow

These are analog controllers with no firmware.

Can it be replaced directly?

There is no known direct drop-in replacement with identical power specs. The closest is the lower-power VIPER12ASTR-E from the same family.

Best replacement path

Use VIPER12ASTR-E if the application's power requirement is below 8W. Otherwise, a redesign with a different controller is likely needed.

Main risk

The primary risk is insufficient power delivery when using lower-rated alternatives, potentially leading to system instability or failure under load.

Recommended alternatives

A lower-power alternative from the same ST VIPer family in an identical SO-8 package.

View details

Alternative comparison matrix

Feature / factor	VIPER22ASTR-E	VIPER12ASTR-E	SM7015	Compatibility / risk
Package	SO-8	SO-8	SOP8	SO-8 / SOP8 — Form and fit match.; SM7015: Package is form-factor equivalent.
Voltage	730V	730V	730V	730V — Drain-Source voltage matches.; SM7015: Drain-Source voltage matches.
Frequency	60kHz	60kHz	60kHz	60kHz — Switching frequency matches.; SM7015: Switching frequency matches.
Power	~12W	8W	-	8W — Lower power capability.
Manufacturer	STMicroelectronics	STMicroelectronics	Sunmoon Micro	STMicroelectronics / Sunmoon Micro — Same manufacturer and family.; SM7015: Cross-vendor alternative.

Application & sourcing insights

Questions & answers

VIPER12ASTR-E is a strong candidate from the same family but has a lower power rating (8W vs 12W). For similar power, other cross-vendor options exist but require full design verification.