component
TL431ILPR
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Texas Instruments Voltage Reference, TO-92-3. 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
markdownTL431ILPR
Texas Instruments · Voltage Reference · TO-92-3
TL431ILPR from Texas Instruments, in a TO-92-3. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | CATHODE | bidirectional | Parallel current/voltage input (cathode, K); the terminal whose regulated voltage VKA is programmed from Vref (~2.5V) up to 36V by external resistors, requires a minimum regulating cathode current Imin of 0.4-1mA and is rated for a recommended continuous cathode current of 1mA to 100mA, with absolute maximum ratings of 37V cathode voltage and -100mA to 150mA cathode current. |
| 2 | ANODE | output | Common pin (anode, A), normally connected to ground/circuit common; provides the return path for the cathode current and is the reference node for the external feedback resistor divider. |
| 3 | REF | input | Reference/threshold input pin (measured relative to the common anode) that is internally compared to the device's ~2.5V bandgap reference; must be supplied with a reference input current of at least a few µA (typ. 2µA, max 4µA at IKA=10mA) and cannot be left floating, with an absolute maximum reference input current range of -0.05mA to 10mA. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | TO-92-3 |
| 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 |
|---|---|---|---|---|---|---|---|
| Reference voltage | Vref | 2440 | 2495 | 2550 | mV | VKA = Vref, IKA = 10mA | 8 |
| Reference input voltage deviation over temperature range (all devices other than SOT23-3 and TL432) | VI(dev) | 5 | 50 | mV | VKA = Vref, IKA = 10mA | 8 | |
| Ratio of change in reference voltage to change in cathode voltage | ΔVref/ΔVKA | -1.4 | -2.7 | mV/V | IKA = 10mA; ΔVKA = 10V - Vref | 8 | |
| Ratio of change in reference voltage to change in cathode voltage | ΔVref/ΔVKA | -1 | -2 | mV/V | IKA = 10mA; ΔVKA = 36V - 10V | 8 | |
| Reference input current | Iref | 2 | 4 | µA | IKA = 10mA, R1 = 10kΩ, R2 = ∞ | 8 | |
| Reference input current deviation over temperature range | II(dev) | 0.8 | 2.5 | µA | IKA = 10mA, R1 = 10kΩ, R2 = ∞ | 8 | |
| Minimum cathode current for regulation | Imin | 0.4 | 1 | mA | VKA = Vref | 8 | |
| Off-state cathode current | Ioff | 0.1 | 1 | µA | VKA = 36V, Vref = 0 | 8 | |
| Dynamic impedance | /ZKA/ | 0.2 | 0.5 | Ω | VKA = Vref, f ≤ 1kHz, IKA = 1mA to 100mA | 8 | |
| Cathode voltage | VKA | 36 | V | 6 | |||
| Continuous cathode current range | IKA | 1 | 100 | mA | 6 | ||
| Operating free-air temperature range (TL43xxI) | TA | -40 | 85 | ℃ | Natural air convection; TL43xxI | 6 | |
| Cathode voltage | VKA | 37 | V | 6 | |||
| Continuous cathode current range | IKA | -100 | 150 | mA | 6 | ||
| Reference input current | II(ref) | -0.05 | 10 | mA | 6 | ||
| Operating junction temperature range | TJ | 150 | °C | 6 | |||
| Storage temperature range | Tstg | -65 | 150 | °C | 6 | ||
| Junction-to-ambient thermal resistance (LP package, TO-92) | RθJA | 140 | °C/W | LP (3-pin) package | 6 | ||
| Junction-to-case (top) thermal resistance (LP package, TO-92) | RθJC(top) | 55 | °C/W | LP (3-pin) package | 6 |
CAD (KiCad official)
- Symbol:
TL431ILPR - Footprint:
Package_TO_SOT_THT:TO-92_Inline - 3D model: TO-92-3 (KiCad packages3D, STEP)
- 3D model files:
tl431ilpr-etched.step/tl431ilpr-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);tl431ilpr.step/tl431ilpr.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (86 pp, sha256
313277b9351e61ed, retrieved 2026-09-23, tier: lcsc) - Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- Extractor: parts-factory
2.0.0/extract_pins 0.2, primaryclaude-haiku-4-5-20251001(text), consensusclaude-sonnet-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).