Compare the candidate package with the outline, pin count and polarity mark on the actual board.
SMD Marking
B4
Possible components matching this marking.A marking is not a guaranteed identification by itself.
19possible components
VERY HIGHambiguity level
Filters19 candidates
Narrow the list using the package, manufacturer or component family printed on the board.
19 possible components
Results are ordered by the available marking evidence.
1 IMB 4(A)2 evidence sources ROHM Semiconductor smd1 TRANSISTOR HIGH2 sources SMD, Dual, int. Rb=10kOhm | Si-PManufacturer hint: ROHM Semiconductor 2 HVC 368B2 evidence sources Renesas Electronics / Hitachi smd1 DIODE HIGH2 sources SMD, Variable Capacitance Diode for VCO, 10V | Si-DiManufacturer hint: Renesas Electronics / Hitachi 3 HSM 2693 (A)2 evidence sources Hitachi smd2 DIODE HIGH2 sources Dual,SMD Tuner-Band-S | Si-DiManufacturer hint: Hitachi 4 BSV 52R2 evidence sources Motorola / Unknown manufacturer (FER) / Philips Semiconductors / National Semiconductor / Thomson Semiconducteurs / Valvo / Fairchild Semiconductor smd2 TRANSISTOR HIGH2 sources SMD, S | Si-NManufacturer hint: Motorola / Unknown manufacturer (FER) / Philips Semiconductors / National Semiconductor / Thomson Semiconducteurs / Valvo / Fairchild Semiconductor 5 SS 05402 evidence sources Unknown manufacturer (WTE) smd1 DIODE HIGH2 sources SMD,Schottky barrier rectifier, 40V 500mA 410mW | Si-DiManufacturer hint: Unknown manufacturer (WTE) 6 MBR 05402 evidence sources Vishay smd1 DIODE HIGH2 sources SMD, Schottky Rectifier | Si-DiManufacturer hint: Vishay 7 MBR 0540 (LT1,LT3)2 evidence sources Motorola smd1 DIODE HIGH2 sources SMD, Schottky | Si-DiManufacturer hint: Motorola 8 HSMS 28142 evidence sources Agilent Technologies smd2 DIODE HIGH2 sources SMD, Dual HF-Schottky Diode, 20V | Si-DiManufacturer hint: Agilent Technologies 9 UMB 4N2 evidence sources ROHM Semiconductor smd1 TRANSISTOR HIGH2 sources SMD, 2x DTA114T, Dual Digital Transistor | Si-P+RManufacturer hint: ROHM Semiconductor 10 PBSS 4160 DPN2 evidence sources Philips Semiconductors smd1 TRANSISTOR HIGH2 sources SMD, Complement. Pair Amp., 60V 0.87A 0.29W | Si-N/PManufacturer hint: Philips Semiconductors 11 IMB 4A2 evidence sources ROHM Semiconductor smd1 TRANSISTOR HIGH2 sources SMD, 2x DTA114T, Dual Digital Transistor | Si-P+RManufacturer hint: ROHM Semiconductor 12 EMB 42 evidence sources ROHM Semiconductor smd1 TRANSISTOR HIGH2 sources SMD, 2x DTA114T, Dual Digital Transistor | Si-P+RManufacturer hint: ROHM Semiconductor 13 B 42 evidence sources NEC (Nippon Electric Company) - TRANSISTOR HIGH2 sources TRANSISTORS, NPNManufacturer hint: NEC (Nippon Electric Company) 14 FSS 252 evidence sources Fagor Electronica smd1 DIODE HIGH2 sources SMD, Schottky Barrier Rectifier, 50V, 2A | Si-DiManufacturer hint: Fagor Electronica 15 BZX884-C3V32 evidence sources Philips Semiconductors smd1 DIODE HIGH2 sources SMD, Voltage regulator diode, 3,3V, tolerance ±5% | Z-DiManufacturer hint: Philips Semiconductors 16 2SC4987-B42 evidence sources Sanyo Semiconductor smd2 TRANSISTOR HIGH2 sources SMD, SS | Si-NManufacturer hint: Sanyo Semiconductor 17 2SC1621-B42 evidence sources NEC (Nippon Electric Company) smd2 TRANSISTOR HIGH2 sources SMD, S | Si-NManufacturer hint: NEC (Nippon Electric Company) 18 BAT54 WT12 evidence sources onsemi smd2 DIODE HIGH2 sources SMD, Schottky | DiManufacturer hint: onsemi 19 KTX 101 U-Y2 evidence sources KEC Semiconductor smd1 TRANSISTOR HIGH2 sources SMD, Dual, Uni, S, T1: NPN, T2: PNP | Si-NPManufacturer hint: KEC Semiconductor
Safe identification
How to verify this result
Check the official datasheet for pinout, voltage, current and thermal ratings—not only the marking.
Do not treat a short marking, a low-confidence candidate or a family match as a drop-in replacement.