component
TL431KB-TP
Public Made by Adomby adom
MCC(美微科) Voltage Reference, SOT-23. 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
markdownTL431KB-TP
MCC(美微科) · Voltage Reference · SOT-23
TL431KB-TP from MCC(美微科), 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: the device regulates the cathode so this pin sits at the internal 2.5 V reference (Vref), with reference input current of 1.5 μA typical and 4.0 μA maximum at IKA = 10 mA. |
| 2 | K | passive | Cathode: sinks 0.1 mA to 100 mA of cathode current, with cathode voltage rated up to 36 V (absolute maximum 37 V) relative to the anode. |
| 3 | A | passive | Anode: the common return terminal for the cathode current, normally tied to circuit ground in shunt regulator applications. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | MCC(美微科) |
| Package | SOT-23 |
| Category | Power Management (PMIC) |
| 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 |
|---|---|---|---|---|---|---|---|
| Cathode Voltage | VKA | 36 | V | 1 | |||
| Cathode Current Range | IK | 1 | 100 | mA | 1 | ||
| Reference Input Current Range | IREF | 0.05 | 10 | mA | 1 | ||
| Operating Temperature | Topr | -40 | 125 | ℃ | 1 | ||
| Storage Temperature Range | TSTG | -65 | 150 | ℃ | 1 | ||
| Power Dissipation | PD | 0.3 | W | at 25℃ | 1 | ||
| Thermal Resistance Junction to Ambient | RθJA | 417 | ℃/W | 1 | |||
| Reference output Voltage | Vref | 2.485 | 2.495 | 2.505 | V | VKA=VREF, IKA=10mA | 2 |
| Deviation of Reference Input Voltage over temperature | △Vref / △T | 4.5 | 17 | mV | VKA=VREF, IKA=10mA, Tmin≤Ta≤Tmax | 2 | |
| Ratio of Change in Reference Input Voltage to Change in Cathode Voltage (VKA 10V to Vref) | △Vref / △VKA | -1 | -2.7 | mV/V | △VKA=10V~Vref | 2 | |
| Ratio of Change in Reference Input Voltage to Change in Cathode Voltage (VKA 36V to 10V) | △Vref / △VKA | -0.5 | -2 | mV/V | △VKA=36V~10V | 2 | |
| Reference Input Current | Iref | 1.5 | 4 | μA | IKA=10mA, R1=10KΩ, R2=∞ | 2 | |
| Deviation of Reference Input Current Over Full Temperature Range | △Iref / △T | 0.4 | 1.2 | μA | IKA=10mA, R1=10KΩ, R2=∞, TA=full Temperature | 2 | |
| Minimum Cathode Current for Regulation | IKA(min) | 0.45 | 1 | mA | 2 | ||
| Off-State Cathode Current | IKA(off) | 0.05 | 0.5 | μA | VKA=40V, VREF=0V | 2 | |
| Dynamic Impedance | ZKA | 0.15 | 0.5 | Ω | IKA=1 to 100mA, f≤1.0KHz | 2 | |
| Equivalent Temperature Factor (whole temperature scope) | 50 | ppm/℃ | Whole temperature scope; typical value as stated in Features | 1 |
CAD (KiCad official)
- Symbol:
TL431KB-TP - Footprint:
Package_TO_SOT_SMD:SOT-23 - 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files:
tl431kb-tp-etched.step/tl431kb-tp-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);tl431kb-tp.step/tl431kb-tp.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: MCC(美微科) datasheet (7 pp, sha256
cdded1b620b68895, retrieved 2026-11-02, 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).