Compare the candidate package with the outline, pin count and polarity mark on the actual board.
SMD Marking
S4
Possible components matching this marking.A marking is not a guaranteed identification by itself.
28possible components
VERY HIGHambiguity level
Filters28 candidates
Narrow the list using the package, manufacturer or component family printed on the board.
28 possible components
Results are ordered by the available marking evidence.
1 1SS 3892 evidence sources Toshiba dil1 DIODE HIGH2 sources SMD, Schottky | Si-DiManufacturer hint: Toshiba 2 1SS 3732 evidence sources Toshiba dil1 DIODE HIGH2 sources SMD, Schottky,S | Si-DiManufacturer hint: Toshiba 3 1SS 3672 evidence sources Toshiba dil1 DIODE HIGH2 sources SMD, Schottky,S | Si-DiManufacturer hint: Toshiba 4 1PS 89SS042 evidence sources Philips Semiconductors smd2 DIODE HIGH2 sources SMD, Dual Schottky barrier diode, 80V | Si-DiManufacturer hint: Philips Semiconductors 5 1PS 76SB402 evidence sources Philips Semiconductors dil1 DIODE HIGH2 sources SMD, Schottky barrier diode, 40V | Si-DiManufacturer hint: Philips Semiconductors 6 D1 FS42 evidence sources Unknown manufacturer (SHI) smd1 DIODE HIGH2 sources SMD, Schottky Barrier Diode, 40V 1.1A | Si-DiManufacturer hint: Unknown manufacturer (SHI) 7 BBY 622 evidence sources Philips Semiconductors / Valvo smd1 DIODE HIGH2 sources SMD, Dual UHF variable capacitance diode | Si-DiManufacturer hint: Philips Semiconductors / Valvo 8 SDM 20U402 evidence sources Unknown manufacturer (DII) smd1 DIODE HIGH2 sources SMD, SURFACE MOUNT SCHOTTKY BARRIER DIODE, 40V 250mA 150mW | Si-GlManufacturer hint: Unknown manufacturer (DII) 9 1T 404A2 evidence sources Sony smd1 DIODE HIGH2 sources SMD, Variable Capacitance Diode, 34V | Si-DiManufacturer hint: Sony 10 SD 103AW2 evidence sources Taiwan Semiconductor smd1 DIODE HIGH2 sources SMD, Schottky Diode, 40V 400mW | Si-DiManufacturer hint: Taiwan Semiconductor 11 ZXT 4M3222 evidence sources Zetex smd1 TRANSISTOR HIGH2 sources SMD, SWITCHING TRANSISTOR, 70V 2.5A, 1W | Si-PManufacturer hint: Zetex 12 PBLS 4004 Y2 evidence sources Philips Semiconductors smd1 TRANSISTOR HIGH2 sources SMD, Complement. Pair Amp., 40V 0.5A 0.2W | Si-N/P+RManufacturer hint: Philips Semiconductors 13 SL042 evidence sources Vishay smd1 DIODE HIGH2 sources SMD, Schottky Diode | Si-DiManufacturer hint: Vishay 14 SD 104BWS2 evidence sources Vishay dil1 DIODE HIGH2 sources SMD, Schottky Diode, 15V | Si-DiManufacturer hint: Vishay 15 KTA 701 U-Y2 evidence sources KEC Semiconductor smd1 TRANSISTOR HIGH2 sources SMD, Dual, Uni, S | Si-PManufacturer hint: KEC Semiconductor 16 KTA 501 U-Y2 evidence sources KEC Semiconductor smd2 TRANSISTOR HIGH2 sources SMD, Dual, Uni, S | Si-PManufacturer hint: KEC Semiconductor 17 FMS 42 evidence sources ROHM Semiconductor smd2 TRANSISTOR HIGH2 sources SMD, 2x 2SA1514K, com. Base/Basis, Uni | Si-PManufacturer hint: ROHM Semiconductor 18 BSV 372 evidence sources Unknown manufacturer (FER) smd2 TRANSISTOR HIGH2 sources SMD, S | Si-PManufacturer hint: Unknown manufacturer (FER) 19 BFQ 31A2 evidence sources Zetex / Thomson Semiconducteurs / Unknown manufacturer (FER) smd2 TRANSISTOR HIGH2 sources SMD, VHF/UHF band transistor, 15V 100mA, 330mW | Si-NManufacturer hint: Zetex / Thomson Semiconducteurs / Unknown manufacturer (FER) 20 BFG 11W/X2 evidence sources Philips Semiconductors smd1 TRANSISTOR HIGH2 sources SMD, 2GHz power transistor, 8V 500mA, 0.76W | Si-NManufacturer hint: Philips Semiconductors 21 SST 1742 evidence sources Siliconix smd2 FET HIGH2 sources SMD | Si-PManufacturer hint: Siliconix 22 HSD 2262 evidence sources Hitachi / Renesas Electronics dil1 DIODE HIGH2 sources SMD, low capacity | Si-DiManufacturer hint: Hitachi / Renesas Electronics 23 HSC 2262 evidence sources Renesas Electronics smd1 DIODE HIGH2 sources SMD, Silicon Schottky Barrier Diode, 25V, 50mA | Si-DiManufacturer hint: Renesas Electronics 24 FS 2G2 evidence sources Fagor Electronica / Lite-On / Unknown manufacturer (JGD) smd1 DIODE HIGH2 sources SMD, Passivated Rectifier, 400V, 1,5A | Si-DiManufacturer hint: Fagor Electronica / Lite-On / Unknown manufacturer (JGD) 25 2SC 3361-S42 evidence sources Sanyo Semiconductor smd2 TRANSISTOR HIGH2 sources SMD, S | Si-NManufacturer hint: Sanyo Semiconductor 26 1T 4042 evidence sources Sony smd1 DIODE HIGH2 sources SMD, Diode, 34V | Si-DiManufacturer hint: Sony 27 2SA 813-S42 evidence sources NEC (Nippon Electric Company) smd2 TRANSISTOR HIGH2 sources SMD, Uni | Si-PManufacturer hint: NEC (Nippon Electric Company) 28 ASS 3552 evidence sources Unknown manufacturer (ANA) smd1 DIODE HIGH2 sources SMD, Switching Diode, 80V, 100mA | Si-DiManufacturer hint: Unknown manufacturer (ANA)
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.