Is there a pin-compatible replacement for LBSS138LT1G?

BSS138 is a very common cross-reference and likely pin-compatible, but its on-resistance (RDSon) may be higher at 5V gate drive. Stronger alternatives like AO3422 and FS2310 also come in the SOT-23 package and are likely pin-compatible, but verification against the datasheets is required for a drop-in replacement.

What risks should I check before replacing LBSS138LT1G?

Key risks include: 1) Electrical stress: ensure the replacement's VDS (voltage) and ID (current) ratings are sufficient. 2) On-resistance (RDSon): a higher value increases power loss and heat. 3) Gate drive voltage: ensure the replacement is fully turned on by your circuit's Vgs. 4) Pinout: confirm the Gate, Drain, and Source pins match.

LBSS138LT1G Alternatives, Datasheet & Cross Reference | LRC

LBSS138LT1G is a common 50V N-Channel MOSFET in a SOT-23 package. This page reviews several potential alternatives, from performance upgrades to functional equivalents, highlighting key parametric differences to ensure a successful substitution.

AI replacement insight

Electrical riskhigh

Using a part with lower VDS or ID is a critical failure risk. Higher RDS(on) increases power loss.

Package risklow

SOT-23 is a standard package, but pinout must always be verified between manufacturers.

Can it be replaced directly?

BSS138 is a common functional alternative, but its on-resistance is higher at 5V gate drive. For a true upgrade, consider AO3422 or FS2310.

Best replacement path

AO3422 and FS2310 are excellent upgrade paths, offering higher ratings and lower on-resistance.

Main risk

The main risks are using a part with lower current rating (ID) or higher on-resistance (RDSon), which can lead to overheating and failure.

Recommended alternatives

A strong upgrade with higher voltage/current ratings and much lower on-resistance.

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Alternative comparison matrix

Feature / factor	LBSS138LT1G	AO3422	FS2310	BSS138	Compatibility / risk
Package	SOT-23	SOT-23	SOT-23	SOT-23	SOT-23 — Package matches.; FS2310: Package matches.; BSS138: Package matches.; ZVN3306F: Package matches.
Voltage	50 V	60 V	60V	50 V	60 V / 60V / 50 V — Higher voltage rating provides more margin.; FS2310: Higher voltage rating provides more margin.; BSS138: Voltage rating matches.; ZVN3306F: Higher voltage rating.
Current	200 mA	3 A	3A	220 mA	3 A / 3A / 220 mA / 150 mA — Significantly higher current handling capability.; FS2310: Significantly higher current handling capability.; BSS138: Slightly higher current rating.; ZVN3306F: Lower continuous current rating is a major risk.
Resistance	3.5 Ω @ 5V	125 mΩ @ 4.5V	120mΩ @ 4.5V	6 Ω @ 4.5V	125 mΩ @ 4.5V / 120mΩ @ 4.5V / 6 Ω @ 4.5V / 5 Ω — Significantly lower RDS(on) improves efficiency.; FS2310: Significantly lower RDS(on) improves efficiency.; BSS138: RDS(on) is worse at a comparable 5V gate drive.; ZVN3306F: Higher RDS(on) will increase power loss.
Power	225 mW	0.35 W	1.2W	-	0.35 W / 1.2W — Higher power dissipation.; FS2310: Much higher power dissipation.

Application & sourcing insights

Questions & answers

AO3422 and FS2310 are excellent upgrade paths, offering higher voltage/current ratings and significantly lower on-resistance (RDSon) in the same SOT-23 package, which can improve efficiency. Pinout should be verified before substitution.