S0T23
S0T23 - SOT-23 Package Designator Query | Not a Component MPN
S0T23 is not a component part number. Verification against distributor and manufacturer sources (DigiKey, Mouser, Octopart, alldatasheet.com, diodes.com, nexperia via mouser.com/pdfdocs) confirms that S0T23 (most likely a zero-for-O misspelling of SOT23) is a PACKAGE DESIGNATOR, not an orderable electronic component. SOT-23 is the JEDEC TO-236AB small-outline transistor package: a 3-lead (or 5/6-lead in SOT23-5/SOT23-6 variants) plastic surface-mount package approximately 2.9 mm x 1.3 mm with a 1.9 mm lead span, used across virtually every semiconductor manufacturer including STMicroelectronics, Diodes Incorporated, Nexperia, Infineon, and Micro Commercial Components.
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.
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