component
2SA2125-TD-E
Public Made by Adomby adom
onsemi Bipolar Transistors - BJT, SOT-89. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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Contents
README
markdown2SA2125-TD-E
onsemi · Bipolar Transistors - BJT · SOT-89
2SA2125-TD-E from onsemi, in a SOT-89. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | Base | passive | Base terminal; base current IB is rated (--)600 mA absolute maximum, and VEBO is (--)6 V. |
| 2 | Collector | passive | Collector terminal; collector current IC is rated (--)3 A continuous and ICP (--)6 A pulsed, with VCEO (--)50 V. |
| 3 | Emitter | passive | Emitter terminal; emitter-to-base breakdown V(BR)EBO is (--)6 V minimum rating per the electrical characteristics. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | SOT-89 |
| Category | Transistors |
| Pins | 3 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Collector to Base Voltage | VCBO | -50 | V | 1 | |||
| Collector to Emitter Voltage | VCES | -50 | V | 1 | |||
| Emitter to Base Voltage | VEBO | -6 | V | 1 | |||
| Collector Current | IC | -3 | A | 2 | |||
| Collector Current (Pulse) | ICP | -6 | A | 2 | |||
| Base Current | IB | -600 | mA | 2 | |||
| Collector Dissipation | PC | 1.3 | W | When mounted on ceramic substrate (250mm2 ×0.8mm) | 2 | ||
| Collector Dissipation | PC | 3.5 | W | Tc=25°C | 2 | ||
| Junction Temperature | Tj | 150 | °C | 2 | |||
| Storage Temperature | Tstg | -55 | 150 | °C | 2 | ||
| Collector Cutoff Current | ICBO | -1 | μA | VCB=(--)40V, IE=0A | 2 | ||
| Emitter Cutoff Current | IEBO | -1 | μA | VEB=(--)4V, IC=0A | 2 | ||
| Collector to Emitter Saturation Voltage | VCE(sat)1 | -125 | -230 | mV | IC=(--)1A, IB=(--)50mA | 2 | |
| Collector to Emitter Saturation Voltage | VCE(sat)2 | -250 | -500 | mV | IC=(--)2A, IB=(--)100mA | 2 | |
| Base to Emitter Saturation Voltage | VBE(sat) | -0.94 | -1.2 | V | IC=(--)2A, IB=(--)100mA | 2 | |
| Collector to Base Breakdown Voltage | V(BR)CBO | -50 | V | IC=(--)10μA, IE=0A | 2 | ||
| Collector to Emitter Breakdown Voltage | V(BR)CES | -50 | V | IC=(--)100μA, RBE=0Ω | 2 | ||
| Emitter to Base Breakdown Voltage | V(BR)EBO | -6 | V | IE=(--)10μA, IC=0A | 2 | ||
| Gain-Bandwidth Product | fT | 390 | MHz | VCE=(--)10V, IC=(--)500mA | 2 | ||
| Output Capacitance | Cob | 24 | pF | VCB=(--)10V, f=1MHz | 2 | ||
| Turn-ON Time | ton | 30 | ns | See specified Test Circuit. | 2 | ||
| Storage Time | tstg | 230 | ns | See specified Test Circuit. | 2 | ||
| Fall Time | tf | 18 | ns | See specified Test Circuit. | 2 |
Materials and finish
As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).
| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| housing | PC | Base Current IB (--)600 mA Collector Dissipation PC | 2 |
CAD (KiCad official)
- Symbol:
2SA2125-TD-E - Footprint:
Package_TO_SOT_SMD:SOT-89-3 - 3D model: SOT-89 (KiCad packages3D, STEP)
- 3D model files:
2sa2125-td-e-etched.step/2sa2125-td-e-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);2sa2125-td-e.step/2sa2125-td-e.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: onsemi datasheet (6 pp, sha256
7726cdc21d63513d, retrieved 2026-10-28, tier: manufacturer) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-sonnet-5-5(agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish. - CAD: KiCad official libraries (CC-BY-SA 4.0).