Is there a pin-compatible replacement for UF2G?

Several diodes like MURS360BT3G and STTH212U use the same 2-pin SMB package and are form-fit compatible. Pin-to-pin functionality depends on the circuit's tolerance for a slightly slower recovery time (75ns vs 50ns).

What risks should I check before replacing UF2G?

The main risk is the reverse recovery time (trr). The UF2G is an ultrafast 50ns diode. Using a slower diode, even a 75ns one, can increase switching losses and EMI. Standard recovery diodes are not suitable.

UF2G Alternatives, Datasheet & Cross Reference | SUNMATE

Finding a substitute for the UF2G ultrafast rectifier requires matching its 400V, 2A rating, SMB package, and critical 50ns recovery time. Alternatives exist with similar form-fit but may have slightly different switching speeds.

AI replacement insight

Electrical riskmedium

Slower trr (75ns vs 50ns) can increase switching losses and EMI in high-frequency circuits.

Package risklow

Candidates use the same SMB package, ensuring mechanical compatibility.

Can it be replaced directly?

No direct drop-in replacement is identified. MURS360BT3G and STTH212U are strong functional candidates in the same package but have a slower reverse recovery time that must be validated.

Best replacement path

MURS360BT3G offers an upgrade in voltage, current, and temperature range, but requires testing due to a slightly slower recovery time (75ns vs 50ns).

Main risk

Increased switching losses or circuit instability due to slower reverse recovery time (trr).

Recommended alternatives

An upgraded ultrafast diode with higher voltage and current ratings, but a slightly slower recovery time.

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Alternative comparison matrix

Feature / factor	UF2G	MURS360BT3G	STTH212U	Compatibility / risk
Package	SMB (DO-214AA)	SMB (DO-214AA)	SMB	SMB (DO-214AA) — Same package ensures form-fit compatibility.; STTH212U: Same package family.
Voltage	400V	600V	1200V	600V / 1200V — Higher voltage rating provides more margin.; STTH212U: Significantly higher voltage rating provides more margin.
Current	2.0A	3.0A	2.0A	3.0A / 2.0A — Higher current rating provides more margin.; STTH212U: Current rating is identical.
Trr	50ns	75ns	75ns	75ns — Slower recovery time may impact high-frequency switching efficiency.; STTH212U: Slower recovery time may impact high-frequency switching efficiency.
Temperature	-50 to +150 °C	-65°C to +175°C	175°C	-65°C to +175°C — Wider operating temperature range.; STTH212U: Higher max operating temperature.

Application & sourcing insights

Questions & answers

MURS360BT3G is a strong alternative, offering higher voltage (600V) and current (3A) in the same SMB package. However, its 75ns recovery time is slightly slower than the UF2G's 50ns and requires verification.