BSS138L pin to pin replacement, cross reference, and alternative parts

Pin-to-pin P2P drop-in for the obsolete onsemi BSS138L. Identical SOT-23-3 footprint and pinout (1=Gate, 2=Drain, 3=Source). Same 50 V VDS, 200 mA ID, 3.5 ohm Rds(on) ratings. onsemi product page (2025) shows BSS138L lifecycle as 'Last Shipments' (the onsemi glossary defines this as the final 6-month shipment window before Obsolete), and DigiKey lists the part as 'Obsolete'. Diodes BSS138-7-F is the universal cross-vendor BSS138 drop-in listed as the primary parametric equivalent on Z2Data and Octopart.

BSS138-7-F is indexed here as a mapped pin-to-pin replacement for BSS138L with package, lifecycle, stock, MOQ, datasheet, and key attribute context for buyer review.

Pin-to-pin P2P drop-in for the obsolete onsemi BSS138L. Infineon BSS138N is the SIPMOS small-signal N-channel MOSFET in PG-SOT-23 (3-pin) with identical SOT-23-3 footprint and pinout (1=Gate, 2=Drain, 3=Source). Same 3.5 Ω RDS(on) at the same gate drive — exact parametric replacement per Ovaga and DigiKey 'Similar' listings. 60 V VDS (vs BSS138L's 50 V) provides 20% extra voltage headroom. 0.23 A ID vs BSS138L's 0.20 A. Recommended primary drop-in for new designs after BSS138L is obsolete.

BSS138N is indexed here as a mapped pin-to-pin replacement for BSS138L with package, lifecycle, stock, MOQ, datasheet, and key attribute context for buyer review.

Pin-to-pin P2P drop-in for the obsolete onsemi BSS138L. Nexperia BSN20 (Diodes Incorporated 7-inch reel variant) is a 50 V N-channel enhancement mode MOSFET in SOT-23-3 with identical pinout to BSS138L. Logic-level gate drive (RDS(on) ~1.8 Ω at Vgs = 10 V), 0.18 A ID, 360 mW Pd. Same 50 V VDS class and SOT-23-3 footprint. Recommended when the design needs lower RDS(on) for reduced conduction loss vs BSS138L.

BSN20-7 is indexed here as a mapped pin-to-pin replacement for BSS138L with package, lifecycle, stock, MOQ, datasheet, and key attribute context for buyer review.

Functional alternative to the obsolete onsemi BSS138L. 2N7002K-7 (Nexperia / Diodes Incorporated) is a 60 V N-channel logic-level enhancement mode MOSFET in SOT-23-3 with the same pinout (1=Gate, 2=Drain, 3=Source). 0.115 A ID and ~3 Ω RDS(on) at Vgs = 10 V. Same logic-level gate drive and small-signal switching application class as BSS138L, but ~2x lower current rating. Use as drop-in when the design's continuous drain current is below 100 mA (level-shifting, load switch, simple analog switches).

2N7002K-7 is indexed here as a mapped pin-to-pin replacement for BSS138L with package, lifecycle, stock, MOQ, datasheet, and key attribute context for buyer review.

Functional alternative to the obsolete onsemi BSS138L. Vishay Si2302CDS-T1-E3 is a 20 V N-channel MOSFET in SOT-23-3 with identical pinout (1=Gate, 2=Drain, 3=Source) to BSS138L. Much lower RDS(on) (0.045 Ω at Vgs = 4.5 V) and higher ID (2.6 A) than BSS138L. ONLY use as functional drop-in when the application stays below 20 V VDS (e.g. 3.3 V or 5 V rail-level shifting). NOT a substitute in 24 V or 48 V circuits. Verify VDS margin before substitution.

SI2302CDS-T1-E3 is indexed here as a mapped pin-to-pin replacement for BSS138L with package, lifecycle, stock, MOQ, datasheet, and key attribute context for buyer review.