S0T23 - SOT-23 Package Designator Query | Not a Component MPN
N.º da peça: S0T23 ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $0 | $0,00 |
| 10 | $0 | $0,00 |
| 100 | $0 | $0,00 |
| 500 | $0 | $0,00 |
| 1.000 | $0 | $0,00 |
S0T23 Visão geral
A package designator such as SOT-23 defines physical dimensions, pad layout, and tape-and-reel orientation, but carries no electrical parameters of its own. Electrical specifications (voltage, current, on-resistance, gain) belong to the specific device housed in the package - for example, the STMicroelectronics STG719 SPDT switch (1.8V to 5.5V, 4 ohm on-resistance at 5V) or the AO3400 N-channel MOSFET (30V, 5.8A, 28 milliohm) both ship in SOT-23.
What is a small-outline transistor package? The SOT (Small Outline Transistor) family comprises small, inexpensive surface-mount plastic-molded packages with leads on two sides. SOT-23 and SC-70 are the two most widely used members, dominating consumer electronics, portable devices, and DC-DC converter designs.
To source actual parts, identify the device marking on the physical component, or consult the schematic BOM, then search that true MPN (e.g., AO3400, STG719, BAV99, MMBT3904). Typical SOT-23-housed device categories include small-signal transistors, MOSFETs, dual diodes, voltage supervisors, LDO regulators, and RF switches.
This page exists to clarify the S0T23/SOT23 ambiguity, provide the JEDEC TO-236AB package context, and direct engineers to the correct orderable MPN. No electrical specifications, pricing, pinout, or alternatives are listed because none exist for a package-only query - all such fields are marked as needing data rather than fabricated.
Alternativas drop-in para S0T23 — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
Nenhuma alternativa drop-in disponível para este produto.
Solicitar alternativasS0T23 Especificações
| Part Type | Package designator (not an orderable component) |
| Package Name | SOT-23 |
| JEDEC Designator | TO-236AB |
| Lead Count (base variant) | 3 |
| Lead Count (extended variants) | 5 (SOT23-5), 6 (SOT23-6) |
| Tipo de montagem | Surface Mount |
| Package Body Length | approx. 2.9 mm |
| Package Body Width | approx. 1.3 mm |
| Lead Span | approx. 1.9 mm |
| Electrical Ratings | Not applicable (package-only query) |
| Known Devices in Package | STG719 (SPDT switch, 1.8V-5.5V, 4 ohm Ron), AO3400 (N-ch MOSFET, 30V, 5.8A, 28 mOhm) |
| Orderable MPN | No - must order the housed device MPN |
Guia de Configuração de Pinos do S0T23 stg719 (spdt switch, 1.8v-5.5v, 4 ohm ron), ao3400 (n-ch mosfet, 30v, 5.8a, 28 mohm)
Configuração de pinos para S0T23 (pacote stg719 (spdt switch, 1.8v-5.5v, 4 ohm ron), ao3400 (n-ch mosfet, 30v, 5.8a, 28 mohm)). A numeração dos pinos, funções e diagramas de conexão estão definidos no datasheet do fabricante. Consulte-o para o footprint exato e diretrizes de soldagem.
Nenhum dado detalhado de pinagem disponível para S0T23.
Consulte a ficha técnica para a configuração completa dos pinos.
Aplicações típicas
S0T23 é adequado para 6 aplicaçãos: Small-Signal Transistor Switching, DC-DC Converter and Load Switch MOSFETs, RF and Analog Switching, Dual Diode and Protection Circuits, Portable and Wearable Electronics, BOM Cleanup and Sourcing of Ambiguous Part Numbers.
Small-Signal Transistor Switching
SOT-23 is the dominant footprint for small-signal switching in consumer and portable electronics. Devices such as the MMBT3904 NPN transistor and DTC143ZCA bias-resistor transistor use the 3-lead TO-236AB outline for load switching, level shifting, and driver stages. When selecting a SOT-23 transistor switch, verify collector/drain current ratings, gain or threshold specifications, and pin assignments from the device datasheet - the package alone guarantees only the footprint. Estimated: a typical small-signal SOT-23 device dissipating 100 mW at theta_JA of roughly 300 C/W rises about 30 C above ambient, comfortably within standard ratings.
Recomendado
DC-DC Converter and Load Switch MOSFETs
Low-voltage N-channel MOSFETs in SOT-23, exemplified by the AO3400 (30V drain-source, 5.8A, 28 milliohm on-resistance), serve as load switches and converter MOSFETs in battery-powered devices. The package suits sub-1W conduction losses: Estimated: 28 milliohm at 2A dissipates about 0.11 W, a safe level for the small outline. For higher currents or power, engineers move to SOT-223, DPAK, or D2PAK footprints, which are larger but not drop-in compatible. Verify gate-charge and threshold parameters per device datasheet.
Recomendado
RF and Analog Switching
The STMicroelectronics STG719 high-speed SPDT CMOS switch (1.8V to 5.5V operation, 4 ohm maximum on-resistance at 5V, 25C) in SOT-23 addresses portable RF antenna switching and audio signal routing. Its wide 1.8V supply floor supports single-cell battery operation, and the silicon-gate C2MOS technology provides fast switching with low charge injection. In these signal-path roles, on-resistance flatness and bandwidth - device-specific parameters - matter far more than package, though the SOT-23 footprint keeps the RF loop short on compact boards.
Recomendado
Dual Diode and Protection Circuits
SOT-23's 3-pin footprint hosts popular dual-diode configurations such as the BAV99 (series pair) and BAV70 (common cathode), used for ESD clamping, input protection, logic clamping, and signal steering. The shared package means footprint reuse across configurations, but pin functions differ fundamentally - series versus common-cathode wiring is not interchangeable. Estimated: small-signal SOT-23 diodes typically handle on the order of 200-400 mW, so verify power ratings in each datasheet before use in clamp circuits absorbing surge energy.
Recomendado
Portable and Wearable Electronics
With a body of approximately 2.9 mm by 1.3 mm and low profile, SOT-23 fits the density demands of phones, wearables, and IoT sensor nodes. Package variants SOT23-5 and SOT23-6 extend the footprint to host small LDOs, supervisors, and switches while retaining the same land-pattern philosophy. When space-constrained designs push toward SC-70/SOT-323 for further shrink, note that lead span differs (approximately 1.6 mm versus 1.9 mm), so the PCB footprint must change - SOT-23 and SC-70 are not drop-in interchangeable. Designers should confirm height and clearance for assembly equipment.
Recomendado
BOM Cleanup and Sourcing of Ambiguous Part Numbers
A practical production scenario: BOM audit tools flag 'S0T23' entries discovered in legacy schematics, where a designer entered the package name instead of the device part number. The resolution workflow is to identify the physical component's SMD marking code, map it via a cross-reference database such as alltransistors.com, confirm the pinout against circuit context, and replace the BOM line with the true orderable MPN. Catching these entries before purchasing prevents ordering useless package drawings and avoids line-down situations on the assembly floor.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para S0T23 — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto |
|---|---|
| Orderable Component | No - package designator only |
| JEDEC Designator | TO-236AB (SOT-23) |
| Lead Count | 3 (variants: 5, 6) |
| Lead Span | approx. 1.9 mm |
| Electrical Ratings | None (depends on housed device) |
| Known Housed Devices | STG719, AO3400, BAV99 family, MMBT3904 |
| Drop-in Alternatives | Not applicable - no device MPN defined |
Principais diferenciais
- Not an orderable component (vs AO3400)
- Industry-standard footprint compatibility (vs SOT-323 / SC-70)
- Ambiguous input requiring resolution (vs STG719)
Notas de projeto
Never enter a package name (SOT23 / S0T23) as a BOM part number. Package-only queries return dozens of unrelated 1-page outline drawings - alldatasheet.com lists 38 results for 'SOT23' spanning switches, transistors, and diodes. The failure mode is ordering a package PDF instead of a component, stalling procurement. Always resolve the housed-device MPN via the SMD marking code before releasing the BOM.
SOT-23 (JEDEC TO-236AB) uses a standardized pad layout available from Diodes Incorporated (diodes.com/assets/Package-Files/SOT23.pdf) and Nexperia. The footprint is shared across manufacturers, so devices are generally footprint-compatible - but pin functions are device-specific. For thermal relief on power devices such as the AO3400, Estimated: generous copper pours under the pins reduce effective theta_JA from the package-natural value of roughly 300 C/W.
Do not confuse SOT-23 with SOT-323 (SC-70 family): the SC-70 lead span of approximately 1.6 mm versus 1.9 mm means the footprints are not interchangeable without redesign. Likewise, same-package parts with different pin functions (BAV99 series diodes versus BAV70 common-cathode) must never be swapped without schematic review. Verify pinout and ratings in both device datasheets before any substitution.
Informações de conformidade
Compliance applies to the housed device MPN, not the package designator. Diodes Incorporated notes that part marking must be referenced from the product datasheet.
