BAT54S

onsemi lists 2N7002 as Active — an N-channel enhancement-mode small-signal MOSFET, V(BR)DSS 60 V, ID 0.115 A, SOT-23 (TO-236) package. This is the industry default for low-side switching, level shifting and load gating in space-constrained circuits: a 60 V, 115 mA envelope covers the vast majority of signal-level switching tasks at minimal board cost. Selection advice: the 2N7002 is a JEDEC-registered type number made by many manufacturers, so the manufacturer matters as much as the code — this record is the onsemi device, and substituting another maker changes the datasheet you qualify against. Confirm the SOT-23 footprint and your actual switched current against the 115 mA rating before design-in. State quantity, packing and date-code requirements in your RFQ; parameters verified against the onsemi official product page, and we reconfirm the offered lot before quotation with a 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.

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.

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.

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.

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