S0T23 - SOT-23 Package Designator Query | Not a Component MPN
MPN: S0T23 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
Drop-in alternatives for S0T23 β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
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Request AlternativesS0T23 Maximum Ratings & Electrical Characteristics
| 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) |
| Mounting Type | 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 |
S0T23 stg719 (spdt switch, 1.8v-5.5v, 4 ohm ron), ao3400 (n-ch mosfet, 30v, 5.8a, 28 mohm) Pin Configuration Guide
Complete pinout information for S0T23 (stg719 (spdt switch, 1.8v-5.5v, 4 ohm ron), ao3400 (n-ch mosfet, 30v, 5.8a, 28 mohm) package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for S0T23.
Refer to the datasheet for full pin configuration.
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this digital IC. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
S0T23 is suitable for 6 applications: 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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
Recommended Products Summary
Engineering reference data for S0T23 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product |
|---|---|
| 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 |
| Unit Price | [DATA_NEEDED] |
| Drop-in Alternatives | Not applicable - no device MPN defined |
Key Differentiators
- Not an orderable component (vs AO3400)
- Industry-standard footprint compatibility (vs SOT-323 / SC-70)
- Ambiguous input requiring resolution (vs STG719)
Design Notes
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.
Compliance Information
Compliance applies to the housed device MPN, not the package designator. Diodes Incorporated notes that part marking must be referenced from the product datasheet.
