MMBT3906

2N4403 is a Diotec PNP silicon switching transistor — 40 V collector-emitter voltage, 600 mA continuous collector current, DC current gain of 100 to 300, 200 MHz transition frequency, TO-92 package, 625 mW dissipation, -65 to +150 °C. The PNP complement pairing is the selection point: the PNP counterpart of the 2N4401 NPN for push-pull, H-bridge and complementary switching stages. Selection advice: for a complementary pair order the 2N4401 (NPN) alongside this 2N4403 (PNP) — they share ratings for symmetric drive. The 625 mW dissipation limits continuous high-current use, so size the load or add a driver for power switching. Diotec lists 2N4403 as Active. Evidence: Diotec 2N4403 datasheet and distributor listings confirm PNP, 40 V, 600 mA, hFE 100-300, 200 MHz and TO-92. Match the full 2N4403 code. State quantity, packing and date-code requirements in your RFQ; we reconfirm the offered lot before quotation and reply within 24 hours.

BC557B is an onsemi PNP general-purpose transistor — 45 V collector-emitter voltage, 100 mA continuous collector current, DC current gain of 200 to 450 (B rank) at 2 mA, 150 MHz transition frequency, TO-92 package, 500 mW dissipation, -55 to +150 °C. The B gain rank is the selection point: guaranteed 200-450 hFE for audio and general-purpose amplification where consistent gain matters, with NPN complements BC546/BC547 in the same family. Selection advice: the B suffix sets the gain rank — A is lower and C is higher, so match the full BC557B code to your gain requirement. Note the plain bulk TO-92 code is listed obsolete at some distributors while the BC557BTA/BC557BTF tape variants remain active — confirm the exact packing code when ordering. Evidence: onsemi/NXP BC557 datasheet and DigiKey listings confirm PNP, 45 V, 100 mA, hFE 200-450 and TO-92. Match the full BC557B code for gain rank. State quantity, packing and date-code requirements in your RFQ; we reconfirm the offered lot before quotation and reply within 24 hours.

MMBT3906LT1G is an onsemi general-purpose PNP transistor in SOT-23, tape and reel — the PNP complement to the MMBT3904LT1G on this site: high-side switching, push-pull stages and complementary pairs. 40 V, 200 mA with 250 MHz transition frequency is the selection point: the jellybean PNP that pairs with the 3904 for totem-pole and H-bridge drivers. Selection advice: the T1G suffix denotes tape and reel; order the 3904 and 3906 together when the design needs matched NPN/PNP pairs — they share footprint and qualification. AEC-Q101 qualified. hFE 300 minimum. Parameters verified against distributor and manufacturer documentation. State quantity, packing and date-code requirements in your RFQ; we reconfirm the offered lot before quotation and reply within 24 hours.

BAT54 is a Schottky barrier diode in SOT-23 — 30 V continuous reverse voltage, 200 mA continuous forward current, 240 mV forward voltage at 0.1 mA, 5 ns reverse recovery, 600 mA surge, guard ring for transient and ESD protection, -65 to +150 °C. The Schottky construction is the selection point: ~240 mV forward drop instead of ~700 mV silicon drop for low-loss blocking and clamping, plus 5 ns recovery for high-speed switching. Selection advice: BAT54 is the single-diode SOT-23 version (pin 2 is no-connect) — BAT54A, BAT54C and BAT54S are dual-diode variants with different pinning, so match the full BAT54 code for diode configuration. Evidence: NXP/Diodes Incorporated BAT54 datasheets and distributor listings confirm Schottky, 30 V, 200 mA, 240 mV Vf and SOT-23. Match the full BAT54 code. State quantity, packing and date-code requirements in your RFQ; we reconfirm the offered lot before quotation and reply within 24 hours.

MMBT2222A is an onsemi NPN small-signal switching transistor in SOT-23 — 40 V collector-emitter voltage, 600 mA continuous collector current, DC current gain of 100 minimum, 300 MHz transition frequency, 350 mW dissipation, -55 to +150 °C, tape-and-reel packing. The SOT-23 package is the selection point: the SMD version of the classic 2N2222A for reflow assembly, keeping the same 40 V/600 mA ratings in a fraction of the board area. Selection advice: the A suffix is the higher-voltage grade — the plain MMBT2222 is only 30 V, so match the full MMBT2222A code. The 350 mW dissipation is lower than the TO-92 version, so derate switching loads accordingly. Evidence: onsemi/Diodes MMBT2222A datasheets and distributor listings confirm NPN, 40 V, 600 mA, 300 MHz and SOT-23. Match the full MMBT2222A code — the A suffix matters for voltage rating. State quantity, packing and date-code requirements in your RFQ; we reconfirm the offered lot before quotation and reply within 24 hours.

Diotec lists MMBT3904 as active — an NPN bipolar junction transistor, VCEO 40 V, IC 200 mA, 0.35 W, SOT-23 package, 150 °C junction temperature. The MMBT3904 is the SMD incarnation of the classic 2N3904: identical die characteristics in a SOT-23 footprint for automated assembly. Selection advice: confirm your circuit was designed for the SMD package — the through-hole 2N3904 and MMBT3904 are electrically equivalent but not footprint-compatible. The complementary PNP is the MMBT3906; for push-pull or complementary stages, source both from the same manufacturer to keep gain grades matched. Parameters verified against the Diotec official product page. State quantity, packing and date-code requirements in your RFQ; we reconfirm the offered lot before quotation and reply within 24 hours.

MMBT4401 is an onsemi NPN switching transistor in SOT-23 — 40 V collector-emitter voltage, 600 mA continuous collector current, DC current gain of 100 to 300 at 150 mA, 250 MHz transition frequency, 300 mW dissipation, -55 to +150 °C, tape-and-reel packing. The SOT-23 package is the selection point: the SMD version of the 2N4401 for reflow assembly, keeping the same 40 V/600 mA ratings with fast 15 ns delay and 20 ns rise times for switching applications. Selection advice: the 300 mW dissipation is lower than the TO-92 version, so derate switching loads accordingly — size the load or add a driver for power switching. The complementary PNP is the MMBT4403 for push-pull stages. Evidence: onsemi MMBT4401 datasheet and distributor listings confirm NPN, 40 V, 600 mA, hFE 100-300, 250 MHz and SOT-23. Match the full MMBT4401 code. State quantity, packing and date-code requirements in your RFQ; we reconfirm the offered lot before quotation and reply within 24 hours.

1N4002 is a 1 A standard-recovery rectifier diode from the 1N400x family — 100 V repetitive peak reverse voltage, 1 A average forward current, 30 A surge capability, axial DO-41 (DO-204AL) package, 1.1 V maximum forward voltage, -65 to +150 °C. The 100 V rating is the selection point: the economical choice for low-voltage rectifiers, relay flyback clamps and reverse-polarity protection where high blocking voltage is unnecessary. Selection advice: pick the voltage grade to match your peak reverse voltage with margin — 1N4004 (400 V) or 1N4007 (1000 V) are the higher-voltage neighbors in the same DO-41 footprint. For switching supplies use an ultrafast type like UF5408 instead, since this is a standard-recovery part. Evidence: Vishay 1N4001–1N4007 datasheet confirms 1 A, 100 V, 30 A surge, DO-41 and 1.1 V forward voltage. Match the full 1N4002 code — the digit sets the voltage rating. State quantity, packing and date-code requirements in your RFQ; we reconfirm the offered lot before quotation and reply within 24 hours.

1N4003 is a general-purpose 1 A rectifier diode in DO-41 — 200 V repetitive peak reverse voltage, 1 A average rectified current, 30 A non-repetitive surge, 1.1 V maximum forward voltage at 1 A, 5 µA reverse leakage, -65 to +150 °C, through-hole axial. The 200 V rating is the selection point: the mid-voltage member of the 1N400x family — choose this grade when your circuit never sees more than 200 V, and step up to the 1N4007 for higher-voltage margins. Selection advice: standard recovery (>500 ns) suits mains-frequency rectification only, not fast switching — use an ultrafast diode for switch-mode outputs. The silver band marks the cathode. Evidence: manufacturer datasheets and distributor listings confirm 200 V, 1 A, 30 A surge and DO-41. Match the full 1N4003 code for voltage grade. State quantity, packing and date-code requirements in your RFQ; we reconfirm the offered lot before quotation and reply within 24 hours.

1N4004 is a 1 A standard-recovery rectifier diode from the 1N400x family — 400 V repetitive peak reverse voltage, 1 A average forward current, 30 A surge capability, axial DO-41 (DO-204AL) package, 1.1 V maximum forward voltage, -65 to +150 °C. The 400 V rating is the selection point: the sweet spot for rectified 230 VAC mains with margin and for general-purpose rectification, relay flyback clamps and reverse-polarity protection. Selection advice: pick the voltage grade to match your peak reverse voltage with margin — 1N4002 (100 V), 1N4005 (600 V) or 1N4007 (1000 V) are the neighbors in the same DO-41 footprint. For switching supplies use an ultrafast type like UF5408 instead, since this is a standard-recovery part. Evidence: Vishay 1N4001–1N4007 datasheet confirms 1 A, 400 V, 30 A surge, DO-41 and 1.1 V forward voltage. Match the full 1N4004 code — the digit sets the voltage rating. State quantity, packing and date-code requirements in your RFQ; we reconfirm the offered lot before quotation and reply within 24 hours.