component
TL431BQDBZRQ1
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Texas Instruments Voltage Reference, SOT-23-3. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
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PCB Footprint
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Datasheet
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Contents
README
markdownTL431BQDBZRQ1
Texas Instruments · Voltage Reference · SOT-23-3
TL431BQDBZRQ1 from Texas Instruments, in a SOT-23-3. 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 | passive | Shunt current or voltage input. Cathode of the internal shunt regulator; conducts current when REF exceeds VREF (2.495 V typ). Recommended operating range VREF to 36 V, cathode current 1-100 mA; dynamic impedance 0.2 Ω typ. |
| 2 | REF | input | Reference/threshold input relative to ANODE. Compared internally against the 2495 mV bandgap reference; drives the shunt element to regulate CATHODE voltage. IREF is 2 µA typ (4 µA max). |
| 3 | ANODE | power_in | Common pin, normally connected to ground. Serves as the reference return for both the REF input and the CATHODE shunt current. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOT-23-3 |
| Category | Power Management (PMIC) |
| Pins | 3 |
Ordering variants
Same part, different packaging or reel option.
TL431BQDBZRQ1TL431BQDBZRQ1DBVRTL431BQDBZRQ1DBVT
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 | 2483 | 2495 | 2507 | mV | VKA = VREF, IKA = 10 mA, see Figure 20 | 5 |
| Deviation of reference voltage over full temperature | VI(DEV) | 14 | 34 | mV | VKA = VREF, IKA = 10 mA, TA = –40°C to 125°C, see Figure 20 | 5 | |
| Ratio of change in reference voltage to change in cathode voltage | ΔVREF/ΔVKA | -1.4 | -2.7 | mV/V | IKA = 10 mA, see Figure 21; ΔVKA = 10 V – VREF | 5 | |
| Ratio of change in reference voltage to change in cathode voltage | ΔVREF/ΔVKA | -1 | -2 | mV/V | IKA = 10 mA, see Figure 21; ΔVKA = 36 V – 10 V | 5 | |
| Reference current | IREF | 2 | 4 | µA | IKA = 10 mA, R1 = 10 kΩ, R2 = ∞, see Figure 21 | 5 | |
| Deviation of reference current over full temperature | II(DEV) | 0.8 | 2.5 | µA | IKA = 10 mA, R1 = 10 kΩ, R2 = ∞, TA = –40°C to 125°C, see Figure 21 | 5 | |
| Minimum cathode current for regulation | IMIN | 0.4 | 0.7 | mA | VKA = VREF, see Figure 20 | 5 | |
| OFF-state cathode current | IOFF | 0.1 | 0.5 | µA | VKA = 36 V, VREF = 0, see Figure 22 | 5 | |
| Dynamic impedance | /ZKA/ | 0.2 | 0.5 | Ω | IKA = 1 mA to 100 mA, VKA = VREF, f ≤ 1 kHz, see Figure 20 | 5 | |
| Cathode voltage (recommended operating) | VKA | 36 | V | Minimum printed as VREF (symbol, not a number) | 4 | ||
| Cathode current | IKA | 1 | 100 | mA | 4 | ||
| Operating free-air temperature | TA | -40 | 125 | °C | 4 | ||
| Cathode voltage | 37 | V | Voltage with respect to ANODE | 4 | |||
| Continuous cathode current | -100 | 150 | mA | 4 | |||
| Reference input current, Low | -50 | µA | Low | 4 | |||
| Reference input current, High | 10 | mA | High | 4 | |||
| Operating junction temperature | TJ | 150 | °C | 4 | |||
| Storage temperature | Tstg | -65 | 150 | °C | 4 | ||
| Junction-to-ambient thermal resistance (DBZ, 3-pin) | RθJA | 334.7 | °C/W | DBZ (SOT-23) 3 pins | 4 | ||
| Junction-to-case (top) thermal resistance (DBZ, 3-pin) | RθJC(top) | 113.5 | °C/W | DBZ (SOT-23) 3 pins | 4 | ||
| Junction-to-board thermal resistance (DBZ, 3-pin) | RθJB | 67.6 | °C/W | DBZ (SOT-23) 3 pins | 4 | ||
| Junction-to-top characterization parameter (DBZ, 3-pin) | ψJT | 6.7 | °C/W | DBZ (SOT-23) 3 pins | 4 | ||
| Junction-to-board characterization parameter (DBZ, 3-pin) | ψJB | 65.9 | °C/W | DBZ (SOT-23) 3 pins | 4 |
CAD (KiCad official)
- Symbol:
TL431BQDBZRQ1 - Footprint:
Package_TO_SOT_SMD:SOT-23-3 - 3D model: SOT-23-3 (KiCad packages3D, STEP)
- 3D model files:
tl431bqdbzrq1-etched.step/tl431bqdbzrq1-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);tl431bqdbzrq1.step/tl431bqdbzrq1.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (31 pp, sha256
6e78e952a7d3e8bc, retrieved 2026-08-17, 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:
ds2sf(Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate. - CAD: KiCad official libraries (CC-BY-SA 4.0).