Is there a pin-compatible replacement for LMBT3904DW1T1G?

While several candidates share the SOT-363 package, none are confirmed as direct pin-compatible replacements without caveats. Key electrical parameters like collector current or DC gain differ, requiring review.

What risks should I check before replacing LMBT3904DW1T1G?

Key risks include: 1) Collector Current (Ic) must be at least 200mA. 2) DC Current Gain (hFE) range should match 100-300 to ensure proper biasing. 3) VCE(sat) should be comparable to avoid increased power loss.

LMBT3904DW1T1G Alternatives, Datasheet & Cross Reference | LRC

LMBT3904DW1T1G is a popular dual NPN general-purpose transistor in a compact SC88/SOT-363 package. Finding a direct replacement requires matching key parameters like voltage, current, gain, and pinout.

AI replacement insight

Electrical riskhigh

Mismatches in collector current and DC gain are critical and require circuit analysis.

Package risklow

Kept candidates share the same SOT-363 package, but pinout must be verified from datasheets.

Can it be replaced directly?

No direct pin-for-pin replacement was found in this batch. All candidates have significant parametric differences, such as lower current or different gain, requiring engineering review.

Best replacement path

Consider LMBT5551DW1T1G as a functional alternate with higher ratings, but verify the different DC gain (hFE) is acceptable for your circuit.

Main risk

The main risks are using a part with lower collector current, which can lead to failure, or a part with a different DC current gain (hFE), which can alter circuit biasing and performance.

Recommended alternatives

A functional alternative with higher ratings but a different gain range that requires review.

View details

Alternative comparison matrix

Feature / factor	LMBT3904DW1T1G	LMBT5551DW1T1G	LBC847BDW1T1G	Compatibility / risk
Package	SC88 (SOT-363)	SC88 (SOT-363)	SC88 (SOT-363)	SC88 (SOT-363) — Package is form-factor compatible.; LBC847BDW1T1G: Package is form-factor compatible.
Voltage	40 V	160 V	45 V	160 V / 45 V — Significantly higher voltage rating.; LBC847BDW1T1G: Higher voltage rating is acceptable.
Current	200 mA	600 mA	100 mA	600 mA / 100 mA — Higher current rating provides more margin.; LBC847BDW1T1G: Candidate current is 50% lower, a significant downgrade.
Hfe	100 - 300	80 - 250	200 - 450	80 - 250 / 200 - 450 — Gain range is shifted lower, may affect circuit bias.; LBC847BDW1T1G: Gain range is shifted higher, may affect circuit bias.
Vce(Sat)	0.4 V	Not specified	-	Not specified — Key parameter for switching losses is missing.
Power	150 mW	-	380 mW	380 mW — Higher power dissipation provides more margin.

Application & sourcing insights

Questions & answers

LMBT5551DW1T1G is a potential functional alternative with higher voltage and current ratings, but its different DC gain (hFE) must be evaluated for your specific application.