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2SD1857L-Q-T92-B
Public Made by Adomby adom
UTC Unisonic Tech Bipolar (BJT), TO-92. 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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README
markdown2SD1857L-Q-T92-B
UTC Unisonic Tech · Bipolar (BJT) · TO-92
2SD1857L-Q-T92-B from UTC Unisonic Tech, in a TO-92. 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 | E | passive | Emitter terminal of the NPN transistor; the datasheet rates emitter-base voltage VEBO at 5 V max and BVEBO at 5 V (IE=50µA). |
| 2 | C | passive | Collector terminal of the NPN transistor; rated VCEO 120 V and VCBO 120 V, continuous IC 2 A, peak ICP 3 A, and TO-92 collector power dissipation PC 0.625 W. |
| 3 | B | passive | Base terminal of the NPN transistor; DC current gain hFE is 82 to 390 at VCE=5V, IC=0.1A, with rank Q at 120-270. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | UTC Unisonic Tech |
| Package | TO-92 |
| Category | Transistors/Thyristors |
| 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-Base Breakdown Voltage | BVCBO | 120 | V | IC=50µA | 3 | ||
| Collector-Emitter Breakdown Voltage | BVCEO | 120 | V | IC=1mA | 3 | ||
| Emitter-Base Breakdown Voltage | BVEBO | 5 | V | IE=50µA | 3 | ||
| Collector Cut-Off Current | ICBO | 1 | µA | VCB=100V | 3 | ||
| Emitter Cut-Off Current | IEBO | 1 | µA | VEB=4V | 3 | ||
| DC Current Transfer Ratio | hFE | 82 | 390 | VCE=5V, IC=0.1A | 3 | ||
| Collector-Emitter Saturation Voltage | VCE(SAT) | 0.4 | V | IC=/IB=1A/0.1A (Note) | 3 | ||
| Transition Frequency | fT | 80 | MHz | VCE=5V, IE= -0.1A, f=30MHz. | 3 | ||
| Output Capacitance | COB | 20 | pF | VCB=10V, IE=0A, f=1MHz (Note) | 3 | ||
| Collector-Base Voltage | VCBO | 120 | V | 3 | |||
| Collector-Emitter Voltage | VCEO | 120 | V | 3 | |||
| Emitter-Base Voltage | VEBO | 5 | V | 3 | |||
| Collector Current | IC | 2 | A | 3 | |||
| Collector Current (pulse) | ICP | 3 | A | 3 | |||
| Collector Power Dissipation | PC | 0.625 | W | TO-92 | 3 | ||
| Junction Temperature | TJ | 150 | °C | 3 | |||
| Storage Temperature | TSTG | -40 | 150 | °C | 3 |
CAD (KiCad official)
- Symbol:
2SD1857L-Q-T92-B - Footprint:
Package_TO_SOT_THT:TO-92_Inline - 3D model: TO-92 (KiCad packages3D, STEP)
- 3D model files:
2sd1857l-q-t92-b-etched.step/2sd1857l-q-t92-b-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);2sd1857l-q-t92-b.step/2sd1857l-q-t92-b.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: UTC Unisonic Tech datasheet (4 pp, sha256
3f19025064c70e0a, retrieved 2026-10-18, tier: lcsc) - 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).