component
FMMT549ATA
Public Made by Adomby adom
Diodes Incorporated Bipolar (BJT), SOT-23. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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FMMT549ATA
Diodes Incorporated · Bipolar (BJT) · SOT-23
FMMT549ATA from Diodes Incorporated, in a SOT-23. 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, at the bottom-left lead in the top-view pin-out; VEBO is -5V max and continuous base current IB is -200mA max. |
| 2 | E | passive | Emitter of the PNP transistor, at the bottom-right lead in the top-view pin-out; VEBO is -5V max. |
| 3 | C | passive | Collector of the PNP transistor, the single lead on the top side in the top-view pin-out; VCEO is -30V, VCBO is -35V and continuous IC is -1A (peak -2A). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Diodes Incorporated |
| Package | SOT-23 |
| 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 | -35 | V | IC = -100µA | 2 | ||
| Collector-Emitter Breakdown Voltage | BVCEO | -30 | V | IC = -10mA | 2 | ||
| Emitter-Base Breakdown Voltage | BVEBO | -5 | V | IE = -100µA | 2 | ||
| Collector Cutoff Current | ICBO | -0.1 | µA | VCB = -30V | 2 | ||
| Collector Cutoff Current | ICBO | -10 | µA | VCB = -30V, TA = 100°C | 2 | ||
| Emitter Cutoff Current | IEBO | -0.1 | µA | VEB = -4V | 2 | ||
| Static Forward Current Transfer Ratio | hFE | 70 | 200 | - | IC = -50mA, VCE = -2V | 2 | |
| Static Forward Current Transfer Ratio | hFE | 80 | 130 | - | IC = -1A, VCE = -2V | 2 | |
| Static Forward Current Transfer Ratio | hFE | 40 | 80 | - | IC = -2A, VCE = -2V | 2 | |
| Static Forward Current Transfer Ratio (FMMT549A) | hFE | 150 | 200 | 500 | - | IC = -500mA, VCE = -2V | 2 |
| Collector-Emitter Saturation Voltage | VCE(sat) | -250 | -500 | mV | IC = -1A, IB = -100mA | 2 | |
| Collector-Emitter Saturation Voltage | VCE(sat) | -500 | -750 | mV | IC = -2A, IB = -200mA | 2 | |
| Collector-Emitter Saturation Voltage (FMMT549A) | VCE(sat) | -300 | mV | IC = -100mA, IB = -1mA | 2 | ||
| Base-Emitter Saturation Voltage | VBE(sat) | -900 | -1250 | mV | IC = -1A, IB = -100mA | 2 | |
| Base-Emitter Turn-On Voltage | VBE(on) | -850 | -1000 | mV | IC = -1A, VCE = -2V | 2 | |
| Output Capacitance | Cobo | 25 | pF | VCB = -10V, f = 1MHz | 2 | ||
| Transition Frequency | fT | 100 | MHz | VCE = -5V, IC = -100mA, f = 100MHz | 2 | ||
| Collector-Base Voltage | VCBO | -35 | V | TA = 25°C | 2 | ||
| Collector-Emitter Voltage | VCEO | -30 | V | TA = 25°C | 2 | ||
| Emitter-Base Voltage | VEBO | -5 | V | TA = 25°C | 2 | ||
| Continuous Collector Current | IC | -1 | A | TA = 25°C | 2 | ||
| Peak Pulse Current | ICM | -2 | A | TA = 25°C | 2 | ||
| Base Current | IB | -200 | mA | TA = 25°C | 2 | ||
| Power Dissipation | PD | 500 | mW | Note 4: FR4 PCB, minimum recommended pad layout, still air | 2 | ||
| Thermal Resistance, Junction to Ambient | RθJA | 250 | °C/W | Note 4: FR4 PCB, minimum recommended pad layout, still air | 2 | ||
| Thermal Resistance, Junction to Lead | RθJL | 197 | °C/W | Note 5: junction to solder point at end of collector lead | 2 | ||
| Operating and Storage Temperature Range | TJ, TSTG | -55 | 150 | °C | 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 |
|---|---|---|---|---|
| contacts | tin | • Terminals: Matte Tin Finish; Solderable per MIL-STD-202, Method 208 | 1 |
CAD (KiCad official)
- Symbol:
FMMT549ATA - Footprint:
Package_TO_SOT_SMD:SOT-23 - 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files:
fmmt549ata-etched.step/fmmt549ata-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);fmmt549ata.step/fmmt549ata.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Diodes Incorporated datasheet (5 pp, sha256
6c157cd3a7e5764d, retrieved 2026-10-20, tier: lcsc) - 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).
# FMMT549ATA
**Diodes Incorporated** · Bipolar (BJT) · SOT-23
FMMT549ATA from Diodes Incorporated, in a SOT-23. 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, at the bottom-left lead in the top-view pin-out; VEBO is -5V max and continuous base current IB is -200mA max. |
| 2 | E | passive | Emitter of the PNP transistor, at the bottom-right lead in the top-view pin-out; VEBO is -5V max. |
| 3 | C | passive | Collector of the PNP transistor, the single lead on the top side in the top-view pin-out; VCEO is -30V, VCBO is -35V and continuous IC is -1A (peak -2A). |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Diodes Incorporated |
| Package | SOT-23 |
| 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 | -35 | | | V | IC = -100µA | 2 |
| Collector-Emitter Breakdown Voltage | BVCEO | -30 | | | V | IC = -10mA | 2 |
| Emitter-Base Breakdown Voltage | BVEBO | -5 | | | V | IE = -100µA | 2 |
| Collector Cutoff Current | ICBO | | | -0.1 | µA | VCB = -30V | 2 |
| Collector Cutoff Current | ICBO | | | -10 | µA | VCB = -30V, TA = 100°C | 2 |
| Emitter Cutoff Current | IEBO | | | -0.1 | µA | VEB = -4V | 2 |
| Static Forward Current Transfer Ratio | hFE | 70 | 200 | | - | IC = -50mA, VCE = -2V | 2 |
| Static Forward Current Transfer Ratio | hFE | 80 | 130 | | - | IC = -1A, VCE = -2V | 2 |
| Static Forward Current Transfer Ratio | hFE | 40 | 80 | | - | IC = -2A, VCE = -2V | 2 |
| Static Forward Current Transfer Ratio (FMMT549A) | hFE | 150 | 200 | 500 | - | IC = -500mA, VCE = -2V | 2 |
| Collector-Emitter Saturation Voltage | VCE(sat) | | -250 | -500 | mV | IC = -1A, IB = -100mA | 2 |
| Collector-Emitter Saturation Voltage | VCE(sat) | | -500 | -750 | mV | IC = -2A, IB = -200mA | 2 |
| Collector-Emitter Saturation Voltage (FMMT549A) | VCE(sat) | | | -300 | mV | IC = -100mA, IB = -1mA | 2 |
| Base-Emitter Saturation Voltage | VBE(sat) | | -900 | -1250 | mV | IC = -1A, IB = -100mA | 2 |
| Base-Emitter Turn-On Voltage | VBE(on) | | -850 | -1000 | mV | IC = -1A, VCE = -2V | 2 |
| Output Capacitance | Cobo | | | 25 | pF | VCB = -10V, f = 1MHz | 2 |
| Transition Frequency | fT | 100 | | | MHz | VCE = -5V, IC = -100mA, f = 100MHz | 2 |
| Collector-Base Voltage | VCBO | | | -35 | V | TA = 25°C | 2 |
| Collector-Emitter Voltage | VCEO | | | -30 | V | TA = 25°C | 2 |
| Emitter-Base Voltage | VEBO | | | -5 | V | TA = 25°C | 2 |
| Continuous Collector Current | IC | | | -1 | A | TA = 25°C | 2 |
| Peak Pulse Current | ICM | | | -2 | A | TA = 25°C | 2 |
| Base Current | IB | | | -200 | mA | TA = 25°C | 2 |
| Power Dissipation | PD | | | 500 | mW | Note 4: FR4 PCB, minimum recommended pad layout, still air | 2 |
| Thermal Resistance, Junction to Ambient | RθJA | | | 250 | °C/W | Note 4: FR4 PCB, minimum recommended pad layout, still air | 2 |
| Thermal Resistance, Junction to Lead | RθJL | | | 197 | °C/W | Note 5: junction to solder point at end of collector lead | 2 |
| Operating and Storage Temperature Range | TJ, TSTG | -55 | | 150 | °C | | 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 |
|---|---|---|---|---|
| contacts | | tin | • Terminals: Matte Tin Finish; Solderable per MIL-STD-202, Method 208 | 1 |
## CAD (KiCad official)
- Symbol: `FMMT549ATA`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `fmmt549ata-etched.step` / `fmmt549ata-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `fmmt549ata.step` / `fmmt549ata.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [Diodes Incorporated datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589839652372193280) (5 pp, sha256 `6c157cd3a7e5764d`, retrieved 2026-10-20, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-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).
[Datasheet PDF](docs/fmmt549ata-datasheet.pdf)