component
BC857AT-7-F
Public Made by Adomby adom
Diodes Incorporated Bipolar Transistors - BJT, SOT-523. 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
markdownBC857AT-7-F
Diodes Incorporated · Bipolar Transistors - BJT · SOT-523
BC857AT-7-F from Diodes Incorporated, in a SOT-523. 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 | B | input | Base of the PNP transistor; the pin-out top view shows it at the bottom left of the package. |
| 2 | E | passive | Emitter of the PNP transistor; the pin-out top view shows it at the bottom right, and VEBO is rated at -6V. |
| 3 | C | passive | Collector of the PNP transistor, on the single-lead side of the package; IC is rated at -100mA and VCEO at -45V. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Diodes Incorporated |
| Package | SOT-523 |
| 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-Base Breakdown Voltage | BVCBO | -50 | V | IC = -100µA, IE = 0 | 3 | ||
| Collector-Emitter Breakdown Voltage | BVCEO | -45 | V | IC = -1mA, IB = 0 | 3 | ||
| Emitter-Base Breakdown Voltage | BVEBO | -6 | V | IE = -100µA, IC = 0 | 3 | ||
| DC Current Gain (A grade) | hFE | 125 | 250 | VCE = -5V, IC = -2mA | 3 | ||
| Collector-Emitter Saturation Voltage | VCE(SAT) | -300 | mV | IC = -10mA, IB = -0.5mA | 3 | ||
| Collector-Emitter Saturation Voltage | VCE(SAT) | -650 | mV | IC = -100mA, IB = -5mA | 3 | ||
| Base-Emitter Voltage | VBE(ON) | -600 | -750 | mV | VCE = -5V, IC = -2mA | 3 | |
| Base-Emitter Voltage | VBE(ON) | -820 | mV | VCE = -5V, IC = -10mA | 3 | ||
| Collector Cutoff Current | ICBO | -15 | nA | VCB = -30V | 3 | ||
| Collector Cutoff Current | ICBO | -4 | µA | VCB = -30V, TA = +150°C | 3 | ||
| Output Capacitance | COBO | 4.5 | pF | VCB = -10V, f = 1MHz | 3 | ||
| Current Gain-Bandwidth Product | fT | 100 | MHz | VCE = -5V, IC = -10mA, f = 100MHz | 3 | ||
| Noise Figure | NF | 10 | dB | IC = -0.2mA, VCE = -5V, RS = 2kΩ, f = 1MHz, BW = 200Hz | 3 | ||
| Collector-Base Voltage | VCBO | -50 | V | TA = +25°C | 2 | ||
| Collector-Emitter Voltage | VCEO | -45 | V | TA = +25°C | 2 | ||
| Emitter-Base Voltage | VEBO | -6 | V | TA = +25°C | 2 | ||
| Collector Current | IC | -100 | mA | TA = +25°C | 2 | ||
| Power Dissipation | PD | 150 | mW | Note 5, TA = +25°C | 2 | ||
| Operating and Storage Temperature Range | TJ, TSTG | -55 | 150 | °C | 2 | ||
| Thermal Resistance, Junction to Ambient | RθJA | 833 | °C/W | Note 5 | 2 | ||
| ESD Human Body Model | ESD HBM | 4000 | V | JEDEC Class 3A | 2 | ||
| ESD Machine Model | ESD MM | 400 | V | JEDEC Class C | 2 | ||
| Base-Emitter Saturation Voltage | VBE(SAT) | -700 | mV | IC = -10mA, IB = -0.5mA | 3 | ||
| Base-Emitter Saturation Voltage | VBE(SAT) | -900 | mV | IC = -100mA, IB = -5mA | 3 |
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 |
|---|---|---|---|---|
| contacts | tin | Terminals: Finish, Matte Tin Plated Leads. Solderable per MIL-STD-202, Method 208 | 1 |
CAD (KiCad official)
- Symbol:
BC857AT-7-F - Footprint:
Package_TO_SOT_SMD:SOT-523 - 3D model: SOT-523, generated from the KiCad footprint (body from the F.Fab outline, terminals on the pads, 0.8 mm nominal SOT-523 height). Neither the vendor nor KiCad ships a 3D model for this package, so the dimensions are nominal, not the manufacturer's CAD (STEP)
- 3D model files:
bc857at-7-f-etched.step/bc857at-7-f-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);bc857at-7-f.step/bc857at-7-f.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Diodes Incorporated datasheet (6 pp, sha256
44f38498f6f42233, retrieved 2026-10-24, tier: manufacturer) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text+vision), consensusclaude-opus-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).