component
TL431A-YK
Public Made by Adomby adom
PJSEMI Voltage References, SOT-23. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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TL431A-YK
PJSEMI · Voltage References · SOT-23
TL431A-YK from PJSEMI, 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 | REF | input | Reference input pin that sets the cathode regulation voltage (VREF 2.483V min to 2.507V max for TL431A); reference input current range is -0.05 to +10 mA. |
| 2 | K | passive | Cathode, the regulated shunt terminal with cathode voltage VREF to 36V recommended (37V absolute max) and cathode current 1 to 100 mA recommended. |
| 3 | A | power_in | Anode, the ground/return terminal of the shunt reference, connected to the lowest circuit potential. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | PJSEMI |
| Package | SOT-23 |
| Category | Power Supply Chip |
| 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 |
|---|---|---|---|---|---|---|---|
| Reference Input Voltage (TL431A 0.5%) | VREF | 2.483 | 2.495 | 2.507 | V | VKA=VREF, IKA=10mA, Ta=25°C | 2 |
| Deviation of Reference Input Voltage Over Temperature | ∆VREF | 4.5 | 17 | mV | VKA=VREF, IKA=10mA, 0°C ≤TA≤+70°C | 2 | |
| Ratio of Change in Reference Input Voltage to Change in Cathode Voltage | ∆VREF/∆VKA | -1 | -2.7 | mV/V | IKA=10mA, ∆VKA=10V~VREF | 2 | |
| Ratio of Change in Reference Input Voltage to Change in Cathode Voltage | ∆VREF/∆VKA | -0.5 | -2 | mV/V | IKA=10mA, ∆VKA=36V~10V | 2 | |
| Reference Input Current | IREF | 0.7 | 4 | µA | IKA=10mA, R1=10KΩ, R2=∞ | 2 | |
| Deviation of Reference Input Current Over Full Temperature Range | ∆IREF | 0.4 | 1.2 | µA | IKA=10mA, R1=10KΩ, R2=∞ | 2 | |
| Minimum Cathode Current for Regulation | IKA(MIN) | 0.45 | 1 | mA | VKA=VREF | 2 | |
| Off-State Cathode Current | IKA(OFF) | 0.17 | 1 | µA | VKA=36V, VREF=0 | 2 | |
| Dynamic Impedance | ZKA | 0.27 | 0.5 | Ω | VKA=VREF, IKA=1~100mA, f≤1.0KHz | 2 | |
| Cathode Voltage | VKA | 2.495 | 36 | V | Min printed as VREF | 1 | |
| Cathode Current | IKA | 1 | 100 | mA | 1 | ||
| Operating Ambient Temperature Range | TOPR | 0 | 70 | °C | 1 | ||
| Cathode Voltage | VKA | 37 | V | Ta=25℃ | 1 | ||
| Cathode Current Range (Continuous) | IKA | -100 | 150 | mA | Ta=25℃ | 1 | |
| Reference Input Current Range | IREF | -0.05 | 10 | mA | Ta=25℃ | 1 | |
| Maximum Power Dissipation | PD | 350 | mW | Ta=25℃ | 1 | ||
| Operating Junction Temperature | TJ | 150 | °C | Ta=25℃ | 1 | ||
| Storage Temperature Range | TSTG | -65 | 150 | °C | 1 |
CAD (KiCad official)
- Symbol:
TL431A-YK - Footprint:
Package_TO_SOT_SMD:SOT-23 - 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files:
tl431a-yk-etched.step/tl431a-yk-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);tl431a-yk.step/tl431a-yk.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: PJSEMI datasheet (4 pp, sha256
02fd9193f0dbb0b7, retrieved 2026-10-22, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-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).
# TL431A-YK
**PJSEMI** · Voltage References · SOT-23
TL431A-YK from PJSEMI, 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 | REF | input | Reference input pin that sets the cathode regulation voltage (VREF 2.483V min to 2.507V max for TL431A); reference input current range is -0.05 to +10 mA. |
| 2 | K | passive | Cathode, the regulated shunt terminal with cathode voltage VREF to 36V recommended (37V absolute max) and cathode current 1 to 100 mA recommended. |
| 3 | A | power_in | Anode, the ground/return terminal of the shunt reference, connected to the lowest circuit potential. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | PJSEMI |
| Package | SOT-23 |
| Category | Power Supply Chip |
| 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 |
|---|---|---|---|---|---|---|---|
| Reference Input Voltage (TL431A 0.5%) | VREF | 2.483 | 2.495 | 2.507 | V | VKA=VREF, IKA=10mA, Ta=25°C | 2 |
| Deviation of Reference Input Voltage Over Temperature | ∆VREF | | 4.5 | 17 | mV | VKA=VREF, IKA=10mA, 0°C ≤TA≤+70°C | 2 |
| Ratio of Change in Reference Input Voltage to Change in Cathode Voltage | ∆VREF/∆VKA | | -1 | -2.7 | mV/V | IKA=10mA, ∆VKA=10V~VREF | 2 |
| Ratio of Change in Reference Input Voltage to Change in Cathode Voltage | ∆VREF/∆VKA | | -0.5 | -2 | mV/V | IKA=10mA, ∆VKA=36V~10V | 2 |
| Reference Input Current | IREF | | 0.7 | 4 | µA | IKA=10mA, R1=10KΩ, R2=∞ | 2 |
| Deviation of Reference Input Current Over Full Temperature Range | ∆IREF | | 0.4 | 1.2 | µA | IKA=10mA, R1=10KΩ, R2=∞ | 2 |
| Minimum Cathode Current for Regulation | IKA(MIN) | | 0.45 | 1 | mA | VKA=VREF | 2 |
| Off-State Cathode Current | IKA(OFF) | | 0.17 | 1 | µA | VKA=36V, VREF=0 | 2 |
| Dynamic Impedance | ZKA | | 0.27 | 0.5 | Ω | VKA=VREF, IKA=1~100mA, f≤1.0KHz | 2 |
| Cathode Voltage | VKA | 2.495 | | 36 | V | Min printed as VREF | 1 |
| Cathode Current | IKA | 1 | | 100 | mA | | 1 |
| Operating Ambient Temperature Range | TOPR | 0 | | 70 | °C | | 1 |
| Cathode Voltage | VKA | | | 37 | V | Ta=25℃ | 1 |
| Cathode Current Range (Continuous) | IKA | -100 | | 150 | mA | Ta=25℃ | 1 |
| Reference Input Current Range | IREF | -0.05 | | 10 | mA | Ta=25℃ | 1 |
| Maximum Power Dissipation | PD | | | 350 | mW | Ta=25℃ | 1 |
| Operating Junction Temperature | TJ | | | 150 | °C | Ta=25℃ | 1 |
| Storage Temperature Range | TSTG | -65 | | 150 | °C | | 1 |
## CAD (KiCad official)
- Symbol: `TL431A-YK`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `tl431a-yk-etched.step` / `tl431a-yk-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tl431a-yk.step` / `tl431a-yk.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [PJSEMI datasheet](docs/tl431a-yk-datasheet.pdf) (4 pp, sha256 `02fd9193f0dbb0b7`, retrieved 2026-10-22, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text), consensus `claude-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).
[Datasheet PDF](docs/tl431a-yk-datasheet.pdf)