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Best Alternatives to BSS138

Package: TO-236-3, SC-59, SOT-23-3onsemiMOSFETs - SinglePackage: Tape & Reel (TR); Cut Tape (CT); Digi-Reel®Technology: MOSFET (Metal Oxide)Drain to Source Voltage (Vdss): 50 VCurrent - Continuous Drain (Id) @ 25°C: 220mA (Ta)Drive Voltage (Max Rds On, Min Rds On): 4.5V, 10V

BSS138 replacements should be checked first for N-channel type, SOT-23 pinout, voltage rating, and RDS(on). The closest listed candidate is PJA138K, but it is not pinout-verified here.

AI replacement insight

Electrical riskmedium

ratings vary by candidate

Package riskmedium

SOT-23 only; pinout missing

Firmware risklow

discrete MOSFET

Sourcing risklow

kept items are Active

Can it be replaced directly?

No pin-compatible BSS138 replacement is confirmed from the provided evidence.

Best replacement path

Review PJA138K first, then derated 2N7002K options.

Main risk

Pinout is missing and several candidates have lower current, higher RDS(on), or lower VDS.

Recommended alternatives

5
PJA138K_R1_00001 package
PJA138K_R1_00001

Panjit International Inc.

Needs validationmedium risk

PJA138K is the closest listed BSS138 alternative, but pinout must be checked.

View details

Alternative comparison matrix

Feature / factorBSS138PJA138K_R1_000012N7002K_R1_005012N7002K-AU_R1_000A2Compatibility / risk
PackageSOT-23SOT-23SOT-23SOT-23SOT-23 — same package; 2N7002K_R1_00501: same package; 2N7002K-AU_R1_000A2: same package; PJA3404_R1_00001: same package
Pinout3-pin GDS unknown3-pin unknown3-pin unknown3-pin unknown3-pin unknown — must verify; 2N7002K_R1_00501: must verify; 2N7002K-AU_R1_000A2: must verify; PJA3404_R1_00001: must verify
Voltage50V50V60V60V50V / 60V / 30V — no 10% margin; 2N7002K_R1_00501: meets margin; 2N7002K-AU_R1_000A2: meets margin; PJA3404_R1_00001: lower VDS
Current340mA500mA300mA300mA500mA / 300mA / 5.6A — higher ID; 2N7002K_R1_00501: lower ID; 2N7002K-AU_R1_000A2: lower ID; PJA3404_R1_00001: higher ID
Resistance2.5/3Ω1.6/2.5Ω3Ω @10V3/4Ω1.6/2.5Ω / 3Ω @10V / 3/4Ω / 0.03/0.045Ω — lower RDS; 2N7002K_R1_00501: higher loss; 2N7002K-AU_R1_000A2: more loss; PJA3404_R1_00001: lower loss

Application & sourcing insights

Questions & answers

From the listed candidates, PJA138K is the closest electrical match, but pinout review is required.