component
TL431BW5-7
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Diodes Incorporated Voltage Reference, SOT-25. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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TL431BW5-7
Diodes Incorporated · Voltage Reference · SOT-25
TL431BW5-7 from Diodes Incorporated, in a SOT-25. 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 | NC | unconnected | No connect pin, labelled NC on the SOT25 pin assignment drawing. |
| 2 | NC | unconnected | Not labelled by function; the datasheet says to leave it floating or connect it to pin 5 (ANODE). |
| 3 | CATHODE | passive | Cathode of the shunt regulator, rated 40V maximum (VKA) and 150mA continuous (IKA), with 1mA to 100mA recommended operating sink current. |
| 4 | REF | input | Reference input that sets the output voltage via an external divider (VREF 2.495V typ), with input current rated -0.050 to +10mA. |
| 5 | ANODE | power_in | Anode of the shunt regulator, the ground reference for all specified voltages. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Diodes Incorporated |
| Package | SOT-25 |
| Category | Power Management (PMIC) |
| Pins | 5 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Reference voltage (TL431B, ±0.5%) | VREF | 2.482 | 2.495 | 2.507 | V | VKA = VREF, IKA = 10mA, TA = 25°C | 3 |
| Deviation of reference voltage over temperature, 0 to 70°C | VDEV | 6 | 16 | mV | VKA = VREF, IKA = 10mA, TA = 0 to 70°C | 3 | |
| Deviation of reference voltage over temperature, -40 to +85°C | VDEV | 14 | 34 | mV | VKA = VREF, IKA = 10mA, TA = -40 to +85°C | 3 | |
| Deviation of reference voltage over temperature, -40 to +125°C | VDEV | 14 | 34 | mV | VKA = VREF, IKA = 10mA, TA = -40 to +125°C | 3 | |
| Ratio of change in reference voltage to change in cathode voltage (10V to VREF) | ΔVREF/ΔVKA | -1.4 | -2.7 | mV/V | IKA = 10mA, VKA = 10V to VREF | 3 | |
| Ratio of change in reference voltage to change in cathode voltage (36V to 10V) | ΔVREF/ΔVKA | -1 | -2 | mV/V | IKA = 10mA, VKA = 36V to 10V | 3 | |
| Reference input current | IREF | 1 | 4 | µA | IKA = 10mA, R1 = 10KΩ, R2 = ∞ | 3 | |
| IREF deviation over temperature, 0 to 70°C | ΔIREF | 0.8 | 1.2 | µA | IKA = 10mA, R1 = 10KΩ, R2 = ∞, TA = 0 to 70°C | 3 | |
| IREF deviation over temperature, -40 to +85°C | ΔIREF | 0.8 | 2.5 | µA | IKA = 10mA, R1 = 10KΩ, R2 = ∞, TA = -40 to +85°C | 3 | |
| IREF deviation over temperature, -40 to +125°C | ΔIREF | 0.8 | 2.5 | µA | IKA = 10mA, R1 = 10KΩ, R2 = ∞, TA = -40 to +125°C | 3 | |
| Minimum cathode current for regulation | IKA(MIN) | 0.4 | 0.7 | mA | VKA = VREF | 3 | |
| Off-state current | IKA(OFF) | 0.05 | 0.5 | µA | VKA = 36V, VREF = 0V | 3 | |
| Dynamic output impedance | /ZKA/ | 0.2 | 0.5 | Ω | VKA = VREF, f = 0Hz | 3 | |
| Reference voltage tolerance at 25°C, grade B (±0.5%) | VREF | -0.5 | 0.5 | % | TL431B grade, TA = 25°C, per Features and Ordering | 1 | |
| Thermal resistance junction to ambient, SOT25 | θJA | 250 | °C/W | SOT25 package | 3 | ||
| Cathode voltage | VKA | 36 | V | Minimum printed as VREF (not numeric) | 2 | ||
| Cathode current | IKA | 1 | 100 | mA | 2 | ||
| Operating ambient temperature | TA | -40 | 125 | °C | 2 | ||
| Cathode voltage | VKA | 40 | V | Voltages relative to ANODE pin | 2 | ||
| Continuous cathode current | IKA | 150 | mA | 2 | |||
| Reference input current | IREF | -0.05 | 10 | mA | 2 | ||
| Operating junction temperature | TJ | 150 | °C | 2 | |||
| Storage temperature | TST | -55 | 150 | °C | 2 | ||
| Power dissipation | PD | 500 | mW | SOT25; ambient 25°C (Notes 5, 6) | 2 |
CAD (KiCad official)
- Symbol:
TL431BW5-7 - Footprint:
Package_TO_SOT_SMD:SOT-23-5 - 3D model: SOT-25 (KiCad packages3D, STEP)
- 3D model files:
tl431bw5-7-etched.step/tl431bw5-7-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);tl431bw5-7.step/tl431bw5-7.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Diodes Incorporated datasheet (14 pp, sha256
8ce0c11446beda6f, retrieved 2026-10-18, 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).
# TL431BW5-7
**Diodes Incorporated** · Voltage Reference · SOT-25
TL431BW5-7 from Diodes Incorporated, in a SOT-25. 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 | NC | unconnected | No connect pin, labelled NC on the SOT25 pin assignment drawing. |
| 2 | NC | unconnected | Not labelled by function; the datasheet says to leave it floating or connect it to pin 5 (ANODE). |
| 3 | CATHODE | passive | Cathode of the shunt regulator, rated 40V maximum (VKA) and 150mA continuous (IKA), with 1mA to 100mA recommended operating sink current. |
| 4 | REF | input | Reference input that sets the output voltage via an external divider (VREF 2.495V typ), with input current rated -0.050 to +10mA. |
| 5 | ANODE | power_in | Anode of the shunt regulator, the ground reference for all specified voltages. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Diodes Incorporated |
| Package | SOT-25 |
| Category | Power Management (PMIC) |
| Pins | 5 |
## Electrical characteristics
Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Reference voltage (TL431B, ±0.5%) | VREF | 2.482 | 2.495 | 2.507 | V | VKA = VREF, IKA = 10mA, TA = 25°C | 3 |
| Deviation of reference voltage over temperature, 0 to 70°C | VDEV | | 6 | 16 | mV | VKA = VREF, IKA = 10mA, TA = 0 to 70°C | 3 |
| Deviation of reference voltage over temperature, -40 to +85°C | VDEV | | 14 | 34 | mV | VKA = VREF, IKA = 10mA, TA = -40 to +85°C | 3 |
| Deviation of reference voltage over temperature, -40 to +125°C | VDEV | | 14 | 34 | mV | VKA = VREF, IKA = 10mA, TA = -40 to +125°C | 3 |
| Ratio of change in reference voltage to change in cathode voltage (10V to VREF) | ΔVREF/ΔVKA | | -1.4 | -2.7 | mV/V | IKA = 10mA, VKA = 10V to VREF | 3 |
| Ratio of change in reference voltage to change in cathode voltage (36V to 10V) | ΔVREF/ΔVKA | | -1 | -2 | mV/V | IKA = 10mA, VKA = 36V to 10V | 3 |
| Reference input current | IREF | | 1 | 4 | µA | IKA = 10mA, R1 = 10KΩ, R2 = ∞ | 3 |
| IREF deviation over temperature, 0 to 70°C | ΔIREF | | 0.8 | 1.2 | µA | IKA = 10mA, R1 = 10KΩ, R2 = ∞, TA = 0 to 70°C | 3 |
| IREF deviation over temperature, -40 to +85°C | ΔIREF | | 0.8 | 2.5 | µA | IKA = 10mA, R1 = 10KΩ, R2 = ∞, TA = -40 to +85°C | 3 |
| IREF deviation over temperature, -40 to +125°C | ΔIREF | | 0.8 | 2.5 | µA | IKA = 10mA, R1 = 10KΩ, R2 = ∞, TA = -40 to +125°C | 3 |
| Minimum cathode current for regulation | IKA(MIN) | | 0.4 | 0.7 | mA | VKA = VREF | 3 |
| Off-state current | IKA(OFF) | | 0.05 | 0.5 | µA | VKA = 36V, VREF = 0V | 3 |
| Dynamic output impedance | /ZKA/ | | 0.2 | 0.5 | Ω | VKA = VREF, f = 0Hz | 3 |
| Reference voltage tolerance at 25°C, grade B (±0.5%) | VREF | -0.5 | | 0.5 | % | TL431B grade, TA = 25°C, per Features and Ordering | 1 |
| Thermal resistance junction to ambient, SOT25 | θJA | | 250 | | °C/W | SOT25 package | 3 |
| Cathode voltage | VKA | | | 36 | V | Minimum printed as VREF (not numeric) | 2 |
| Cathode current | IKA | 1 | | 100 | mA | | 2 |
| Operating ambient temperature | TA | -40 | | 125 | °C | | 2 |
| Cathode voltage | VKA | | | 40 | V | Voltages relative to ANODE pin | 2 |
| Continuous cathode current | IKA | | | 150 | mA | | 2 |
| Reference input current | IREF | -0.05 | | 10 | mA | | 2 |
| Operating junction temperature | TJ | | | 150 | °C | | 2 |
| Storage temperature | TST | -55 | | 150 | °C | | 2 |
| Power dissipation | PD | | | 500 | mW | SOT25; ambient 25°C (Notes 5, 6) | 2 |
## CAD (KiCad official)
- Symbol: `TL431BW5-7`
- Footprint: `Package_TO_SOT_SMD:SOT-23-5`
- 3D model: SOT-25 (KiCad packages3D, STEP)
- 3D model files: `tl431bw5-7-etched.step` / `tl431bw5-7-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tl431bw5-7.step` / `tl431bw5-7.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/8560092749220372480) (14 pp, sha256 `8ce0c11446beda6f`, retrieved 2026-10-18, 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/tl431bw5-7-datasheet.pdf)