Is there a pin-compatible replacement for FR307?

Yes, parts like HER308 and MUR4100 use the same DO-201AD package and are pin-compatible. However, electrical validation, especially for forward voltage and resulting heat, is crucial.

What risks should I check before replacing FR307?

The main risk is higher power loss from increased forward voltage (Vf), which can cause overheating. Also verify the reverse recovery time (Trr) meets your circuit's switching speed needs.

FR307 Alternatives, Datasheet & Cross Reference | Microdiode Semiconductor (Shenzhen) Co., Ltd.

FR307 is a 3A, 1000V fast recovery rectifier in a DO-201AD package. Finding a substitute requires matching voltage and current ratings while carefully checking forward voltage and recovery time.

AI replacement insight

Electrical riskmedium

Higher forward voltage in candidates will increase power loss and heat.

Package risklow

Candidates share the same DO-201AD package, ensuring mechanical compatibility.

Can it be replaced directly?

No direct drop-in replacement has been identified. Candidates like HER308 and MUR4100 match the package and key ratings but have a higher forward voltage, which impacts efficiency and thermal performance.

Best replacement path

Evaluate HER308 or MUR4100. They offer faster recovery times but require a thermal design review due to higher forward voltage.

Main risk

The primary risk is increased power dissipation due to higher forward voltage (Vf) in available alternatives, potentially leading to overheating.

Recommended alternatives

A 1000V, 3A high-efficiency diode in a matching DO-201AD package, but with higher forward voltage.

View details

Alternative comparison matrix

Feature / factor	FR307	HER308	MUR4100	Compatibility / risk
Package	DO-201AD	DO-201AD	DO-201AD	DO-201AD — Same package ensures form and fit compatibility.; MUR4100: Same package ensures form and fit compatibility.
Voltage	1000V	1000V	1000V	1000V — Reverse voltage matches the target's requirement.; MUR4100: Reverse voltage matches the target's requirement.
Current	3A	3A	4A	3A / 4A — Current rating matches the target.; MUR4100: Higher current rating provides more margin.
Forward Voltage	1.3V	1.7V	1.8V	1.7V / 1.8V — Significantly higher Vf will increase power loss.; MUR4100: Significantly higher Vf will increase power loss.
Recovery Time	500ns	~70ns	~75ns	~70ns / ~75ns — Much faster recovery time is a performance upgrade.; MUR4100: Much faster recovery time is a performance upgrade.

Application & sourcing insights

Questions & answers

HER308 is a strong candidate, matching the package, voltage, and current. However, its higher forward voltage (1.7V vs 1.3V) requires thermal validation before use.