component
MMBT3906T
Public Made by Adomby adom
Changjing Bipolar (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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README
markdownMMBT3906T
Changjing · Bipolar (BJT) · SOT-523
MMBT3906T from Changjing, 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 | BASE | input | Base terminal of the PNP transistor; the datasheet gives no pin-specific limit, only device ratings such as VEBO -5.0 V and continuous IC -200 mA. |
| 2 | EMITTER | passive | Emitter terminal of the PNP transistor; the datasheet gives no pin-specific limit, with the emitter-base rating VEBO stated as -5.0 V. |
| 3 | COLLECTOR | passive | Collector terminal of the PNP transistor; the datasheet gives no pin-specific limit, with device ratings of VCBO -40 V, VCEO -40 V and continuous IC -200 mA. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| Package | SOT-523 |
| 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-Emitter voltage | VCEO | -40 | V | 1 | |||
| Collector-Base voltage | VCBO | -40 | V | 1 | |||
| Emitter-Base voltage | VEBO | -5 | V | 1 | |||
| Collector Current -Continuous | IC | -200 | mA | 1 | |||
| Collector Power Dissipation | PC | 150 | mW | 1 | |||
| Operating Temperature | TJ | 150 | ℃ | 1 | |||
| Storage Temperature | Tstg | -55 | 150 | ℃ | 1 | ||
| Thermal Resistance, Junction to Ambient | RθJA | 833 | ℃/W | 1 | |||
| Collector-base breakdown voltage | V(BR)CBO | -40 | V | IC=-10μA,IE=0 | 1 | ||
| Collector-emitter breakdown voltage | V(BR)CEO | -40 | V | IC=-1mA,IB=0 | 1 | ||
| Emitter-base breakdown voltage | V(BR)EBO | -5 | V | IE=-10μA,IC=0 | 1 | ||
| Collector cut-off current | ICBO | -0.1 | μA | VCB=-30V,IE=0 | 1 | ||
| Emitter cut-off current | IEBO | -0.1 | μA | VEB=-5V,IC=0 | 1 | ||
| DC current gain | hFE(1) | 60 | VCE=-1V,IC=-0.1mA | 1 | |||
| DC current gain | hFE(2) | 80 | VCE=-1V,IC=-1mA | 1 | |||
| DC current gain | hFE(3) | 100 | 300 | VCE=-1V,IC=-10mA | 1 | ||
| DC current gain | hFE(5) | 30 | VCE=-1V,IC=-100mA | 1 | |||
| Collector-emitter saturation voltage | VCE(sat)1 | -0.25 | V | IC=-10mA,IB=-1mA | 1 | ||
| Collector-emitter saturation voltage | VCE(sat)2 | -0.4 | V | IC=-50mA,IB=-5mA | 1 | ||
| Base-emitter saturation voltage | VBE(sat)1 | -0.65 | -0.85 | V | IC=-10mA,IB=-1mA | 1 | |
| Base-emitter saturation voltage | VBE(sat)2 | -0.95 | V | IC=-50mA,IB=-5mA | 1 | ||
| Transition frequency | fT | 250 | MHz | VCE=-20V,IC=-10mA,f=100MHz | 1 | ||
| Collector output capacitance | Cobo | 4.5 | pF | VCB=-5V,IE=0,f=1MHz | 1 | ||
| Input capacitance | Ciob | 10 | pF | VEB=-0.5V,IE=0,f=1MHz | 1 | ||
| Noise figure | NF | 4 | dB | VCE=-5V,Ic=0.1mA | 1 | ||
| Collector cut-off current (ICEX) | ICEX | -0.05 | μA | VCB=-30V,VBE(off)=-3V | 1 | ||
| Delay time | td | 35 | nS | 1 | |||
| Rise time | tr | 35 | nS | VCC=-3V, VBE(OFF)=-0.5V IC=-10mA , IB1=-1mA | 1 | ||
| Storage time | tS | 225 | nS | 1 | |||
| Fall time | tf | 75 | nS | VCC=-3V, IC=-10mA IB1= IB2=-1mA | 1 |
CAD (KiCad official)
- Symbol:
MMBT3906T - 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:
mmbt3906t-etched.step/mmbt3906t-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);mmbt3906t.step/mmbt3906t.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Changjing datasheet (4 pp, sha256
7e7892169a85ff6f, retrieved 2026-10-09, 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).