2N7002

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.

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.

2N7002LT1G is an onsemi N-channel small-signal MOSFET in SOT-23, tape and reel — for general-purpose switching: relay drivers, LED strings and logic-level load switches. 60 V, 115 mA in a tiny SOT-23 is the selection point: the jelly-bean FET for low-power switching everywhere on the board. Selection advice: the T1G suffix denotes tape and reel with lead-free finish; onsemi lists this part as Active. Against the BSS138LT1G on this site (50 V, 200 mA, 3.5 Ω logic-level): the 2N7002 handles slightly higher voltage but needs more gate drive (7.5 Ω at 10 V) — for 3.3 V logic-level switching the BSS138 is the better pick, while the 2N7002 suits relay coils and LED strings on higher-voltage rails such as 24 V industrial. 225 mW package dissipation sets the ceiling; size the load accordingly. 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.

onsemi lists BAT54S as Obsolete — a dual series Schottky barrier diode, SOT-23-3 package, VRRM 30 V, VF max 800 mV, IO 0.2 A, trr 5 ns. This was the default small-signal Schottky for clamping, reverse protection and switching in space-constrained circuits; its advantage was the dual-diode SOT-23 integration at minimal board cost. Selection advice: because onsemi has discontinued this code, treat BAT54S as a legacy reference — for new designs qualify a current-production dual Schottky (check configuration: the S suffix denotes the series pair; common-cathode and common-anode variants are different parts), and for repairs send quantity and date-code requirements with your RFQ so we can check remaining traceable stock. Parameters verified against the onsemi official product page. We reconfirm the offered lot before quotation and reply within 24 hours.

BAV99 is a former Fairchild dual series switching diode in SOT-23 — two high-speed switching diodes in a series pair, 70 V repetitive peak reverse voltage, 200 mA average rectified current per diode, 1.25 V maximum forward voltage at 150 mA, 6 ns reverse recovery time, 350 mW power dissipation, −55 to +150 °C. The series pair in one SOT-23 is the selection point: it provides a compact high-side/low-side clamping or switching pair for signal lines, reverse-polarity protection and fast commutation in telecom, consumer and portable circuits with one placement. Selection advice: the plain BAV99 code is marked no longer manufactured on distributor pages — current production ships under tape-and-reel order codes such as BAV99LT1G; match the exact code to your BOM rather than assuming the base code is orderable. The 70 V rating suits signal-level work, not mains-side clamping. Evidence: former Fairchild BAV99 datasheet and distributor listings confirm 70 V, 200 mA, 6 ns, SOT-23 and the discontinued status of the bare BAV99 code. 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.

BAV99LT1G is an onsemi dual series switching diode in SOT-23, tape and reel — for signal routing, clamping and reverse-polarity protection where two diodes must track together. Two 100 V / 215 mA diodes in one SOT-23 is the selection point: half the footprint of two discretes with matched characteristics. Selection advice: the T1G suffix denotes tape and reel (3,000 per reel); the S-prefixed SBAV99LT1G is the automotive-qualified variant — this base version is AEC-Q101 qualified per the onsemi datasheet, and PPAP-capable for qualified builds. Series connection suits bidirectional clamping and bridge configurations in a single package. Parameters verified against the onsemi BAV99LT1/D datasheet and distributor listings. State quantity, packing and date-code requirements in your RFQ; we reconfirm the offered lot before quotation and reply within 24 hours.

BSS138 is an onsemi N-channel logic-level small-signal MOSFET in SOT-23 — VDS 50 V, continuous drain current 0.2 A, logic-level gate drive. The logic-level threshold is the selection point: it switches fully from 3.3 V or 5 V MCU outputs with no gate driver — the classic MOSFET for I2C/SPI level shifting and small load switching. Selection advice: this is the default N-channel for bidirectional level shifters (the BSS138-plus-two-resistors circuit); check the ~3.5 Ω RDS(on) against your load current — at 200 mA it drops 0.7 V, so for higher currents step up to a larger MOSFET. onsemi lists the BSS138 as Active (BSS138LT1G). Evidence: distributor data confirms onsemi BSS138LT1G, 50 V, 0.2 A, SOT-23. Match the full BSS138 code. State quantity, packing and date-code requirements in your RFQ; we reconfirm the offered lot before quotation and reply within 24 hours.

BSS138LT1G is an onsemi N-channel small-signal MOSFET in SOT-23, tape and reel — for level shifting and load switching in space-constrained designs. 50 V, 200 mA with logic-level gate (1.5 V max threshold) is the selection point: it switches cleanly from 3.3 V and 5 V logic with no gate driver. Selection advice: the T1G suffix denotes tape and reel with lead-free finish. This is the classic bidirectional I2C level-shifter FET — one BSS138 plus two pull-ups per line translates between voltage domains. Against the 2N7002LT1G on this site (60 V, 115 mA, 7.5 Ω): the BSS138 offers lower Rds(on) at 3.5 Ω and higher current for switching loads; the 2N7002 suits slightly higher voltage at lower current. At 200 mA the 3.5 Ω drop dissipates about 0.14 W — inside the 225 mW package budget, but leave margin. For power switching, step up to a larger MOSFET. 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.

BZX84C5V1LT1G is an onsemi 5.1 V Zener diode in SOT-23, tape and reel — for voltage regulation and reference clamping: rail clamps, bias references and overvoltage shunts. 5.1 V nominal at 5 mA test current with 300 mW dissipation is the selection point: the industry-standard SOT-23 Zener footprint. Selection advice: the C denotes the tolerance band — C is ±6%, while the B-suffixed BZX84B5V1 is the tighter ±2% version; choose B where the reference accuracy matters, C where cost matters. The T1G suffix denotes tape and reel. −65 °C to +150 °C. onsemi lists this part as Active through distribution; no automotive qualification is claimed for this suffix. Parameters verified against onsemi documentation and distributor listings. State quantity, packing and date-code requirements in your RFQ; we reconfirm the offered lot before quotation and reply within 24 hours.

MMBT3904LT1G is an onsemi general-purpose NPN transistor in SOT-23, tape and reel — for small-signal switching and amplification: driver stages, level shifting and discrete logic. 40 V, 200 mA with 300 MHz transition frequency is the selection point: the classic jellybean NPN in the smallest common SMD package. Selection advice: the T1G suffix denotes tape and reel — for the PNP complement, the MMBT3906LT1G on this site is the mirror part. AEC-Q101 qualified, so it is usable in automotive-adjacent builds where a qualified jellybean is required. 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.

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