2N3906

BC557BTA is onsemi’s PNP general-purpose transistor — 45 V / 100 mA in TO-92 — the PNP complement to the BC547 NPN, for low-noise audio stages, complementary drivers and general switching. The ‘B’ is the gain rank (hFE 200–450; A covers 110–220, C covers 420–800); ‘TA’ denotes tape/ammo packing. Selection advice: pair with BC547B for complementary push-pull stages — same 45 V / 100 mA ratings and pinout family. For SMD work the equivalent is BC857B in SOT-23, but note the SOT-23 parts top out at 250 mW versus 500 mW here, so re-check dissipation when converting a through-hole design to surface mount. Active at distribution with factory stock visible; lead times run roughly 12–20 weeks, so buffer ahead for production runs. Parameters trace to the manufacturer datasheet; state quantity, packing and date-code requirements in your RFQ — we reconfirm the offered lot before quotation and reply within 24 hours.

2N5088 is an onsemi NPN low-noise amplifier transistor — 30 V collector-emitter voltage, 50 mA continuous collector current, DC current gain of 300 to 900, 50 MHz transition frequency, 625 mW dissipation, TO-92 package, -55 to +150 °C. The low-noise 300-900 gain range is the selection point: designed for low-level, low-noise preamplifier stages where the high minimum gain of 300 reduces base-current noise contribution. Selection advice: 2N5088 is the 30 V version — the 2N5089 is the 25 V version of the same family, so match the full 2N5088 code to your voltage requirement. Evidence: onsemi 2N5088/2N5089 datasheet and distributor listings confirm NPN, 30 V, 50 mA, hFE 300-900, 50 MHz and TO-92. Match the full 2N5088 code. State quantity, packing and date-code requirements in your RFQ; we reconfirm the offered lot before quotation and reply within 24 hours.

2N5551 is an onsemi NPN general-purpose high-voltage amplifier transistor in TO-92 — 160 V collector-emitter breakdown, 180 V collector-base, 6 V emitter-base, 600 mA continuous collector current, 625 mW power dissipation, DC current gain 80 to 250, 100 MHz minimum transition frequency, −55 to +150 °C. The 160 V rating in a small-signal TO-92 is the selection point: high-voltage preamplifier stages, level shifters and gas-discharge display drivers get serious voltage headroom without moving to a power package. Selection advice: onsemi order codes carry the packing — 2N5551TA (ammo), 2N5551TFR (tape and reel), 2N5551BU (bulk) — match the suffix to your assembly line, and do not confuse it with the lower-voltage 2N3904. The MMBT5551 is the SOT-23 SMD equivalent for reflow designs. onsemi lists the bare 2N5551 code as Obsolete — treat any offer as end-of-life stock with date-code traceability. Evidence: onsemi 2N5551/MMBT5551 datasheet and distributor listings confirm 160 V, 600 mA, hFE 80–250, 100 MHz and TO-92. Match the full code. State quantity, packing and date-code requirements in your RFQ; we reconfirm the offered lot before quotation and reply within 24 hours.

2N7000 is onsemi’s through-hole N-channel small-signal MOSFET — 60 V / 200 mA in TO-92 — for low-side switching, relay drivers and level shifting where a through-hole FET is wanted. Like its 500 mA sibling BS170, the 5 Ω RDS(on) is the design constraint: at 200 mA it drops a full volt, so treat ~100 mA as the comfortable continuous range in still air. Selection advice: onsemi’s datasheet header marks this part AEC Qualified and PPAP capable — unusual for a jellybean TO-92 FET, and useful when a low-cost automotive-adjacent switch is needed without requalifying. For higher current in the same footprint use BS170 (500 mA, same 60 V / 5 Ω, in this catalog); for SMD use 2N7002 in SOT-23 (300 mA). VGS(th) max 2.1 V means 5 V logic drives it well; 3.3 V logic is usable but check the threshold spread at your temperature extremes. Active through distribution. State quantity, packing and date-code requirements in your RFQ; we reconfirm the offered lot before quotation and reply within 24 hours.

onsemi lists BC547BTA as Active — an NPN general-purpose small-signal transistor, VCEO 45 V, IC 0.1 A, hFE 200–450 (B grade), fT 300 MHz, TO-92 ammo packaging. The B gain grade is the selection point: hFE 200–450 gives predictable amplification for small-signal stages, while A and C grades shift the gain band and are not interchangeable in tuned circuits. Selection advice: the TA suffix denotes TO-92 ammo (tape) packing for automated insertion — the BC547 also ships in bulk and SMD packages, so match the full BC547BTA code to your assembly process. This is a jellybean part where remarked stock circulates: require lot traceability. State quantity, packing and date-code requirements in your RFQ; we reconfirm the offered lot before quotation and reply within 24 hours.

BS170 is onsemi’s classic N-channel small-signal MOSFET in TO-92 — 60 V / 500 mA — for low-side switching, relay drivers and level shifting where a through-hole part is wanted. The headline trap is RDS(on): 5 Ω maximum at VGS = 10 V, roughly ten times a modern logic-level FET — at 500 mA it drops 2.5 V and dissipates over a watt, so treat 100–200 mA as the practical continuous range without thermal design. Selection advice: VGS(th) spans 0.8–3.0 V, so 5 V logic drives it comfortably but 3.3 V logic is marginal at temperature extremes — for 3.3 V-only designs prefer a logic-level MOSFET such as 2N7002 in SOT-23. The through-hole 2N7000 is the nearest cross (same TO-92, 60 V / 200 mA) and is often interchangeable in sub-200 mA switching. Distributor suffixes BS170-D26Z (reel) and BS170-D27Z (cut tape) are packing codes for the same die. Active through distribution. Parameters trace to the manufacturer datasheet; state quantity, packing and date-code requirements in your RFQ — we reconfirm the offered lot before quotation and reply within 24 hours.

1N4001 is an onsemi standard rectifier diode — VRRM 50 V, 1 A average rectified current, DO-41 axial package. The 1N400x family is the selection point: the cheapest diode on earth for mains-frequency rectification and reverse-polarity protection — a jellybean part every lab stocks by the thousand. Selection advice: the 1N4001 is the 50 V bottom grade of the 1N4001–1N4007 family (50 V to 1000 V, same DO-41 package) — for mains work always specify the 1N4007 (1000 V); the 1N4001 suits low-voltage rails only. For switching supplies above a few kHz use a fast-recovery type instead — standard recovery overheats at high frequency. onsemi lists the 1N4001 as Active. Evidence: distributor data confirms onsemi 1N4001 Active, 50 V, 1 A, DO-41. Match the full 1N4001 code — siblings look identical. State quantity, packing and date-code requirements in your RFQ; we reconfirm the offered lot before quotation and reply within 24 hours.

1N4148 is the industry-standard high-speed switching diode — 100 V repetitive reverse voltage, 200 mA average forward current, 4 ns reverse recovery — in a DO-35 axial glass package. The 4 ns trr is the selection point: fast enough for megahertz switching, clamping and reverse-polarity steering in signal paths, where a 1N4007’s microsecond-scale recovery would distort or overheat. Selection advice: the bare 1N4148 code is the base part — onsemi ships it as 1N4148-T50A (ammo pack) or 1N4148-T50R (reel), so quote the suffixed code to get the right packing. For SMD boards the electrical equivalents are LL4148 (SOD-80) and 1N4148W (SOD-123), the same die in surface-mount packages. 1N914 is the older JEDEC number most vendors treat as interchangeable, but 1N4148’s leakage specification is tighter — stay with 1N4148 for precision clamping. Active through distribution. Parameters trace to the manufacturer datasheet; state quantity, packing and date-code requirements in your RFQ — we reconfirm the offered lot before quotation and reply within 24 hours.

1N4733A is an onsemi 5.1 V Zener diode, 1 W maximum power dissipation, axial-lead DO-41 (DO-204AL) package — 5.1 V nominal Zener voltage at 49 mA test current, 7 Ω maximum Zener impedance, 10 µA maximum reverse leakage at 1 V, temperature coefficient −0.01 to +0.04 %/°C, color band marking the cathode. The 5.1 V value is the selection point: it is the natural shunt reference and overvoltage clamp for 5 V logic rails — a one-part overvoltage crowbar, reference or transient clamp where a precision IC reference would be overkill. Selection advice: the bare 1N4733A code is the general through-hole form; the -A suffix is ammo pack and -T is tape and reel — match the suffix to your insertion equipment. Note that only the -T50R variant is listed obsolete per PDN PD24582X; the exact code 1N4733A remains Active. onsemi lists 1N4733A as Active. Evidence: onsemi 1N4728A–1N4761A datasheet and distributor listings confirm 5.1 V, 1 W, 49 mA, DO-41 and Active status. Match the full 1N4733A code. State quantity, packing and date-code requirements in your RFQ; we reconfirm the offered lot before quotation and reply within 24 hours.

onsemi lists 1N4742A as Active — a Zener diode, VZ typ 12 V at IZT 21 mA, P max 1 W, axial-lead DO-41 package. The 12 V Zener voltage is the selection point: a simple, robust shunt reference and overvoltage clamp for 12 V rails, gate protection and signal limiting. Selection advice: the 1N47xx family spans 3.3 V to 100 V in the same DO-41 package — a wrong-voltage sibling looks identical, so match the full 1N4742A code. Verify your bias current keeps the diode in breakdown within its 1 W dissipation limit. Parameters verified against the onsemi 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.

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