TLV431IDBVR - 1.5% 6V Adj Shunt Reference | Texas Instruments
料号： TLV431IDBVR ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0.46 | $0.46 |
| 10 | $0.38 | $3.80 |
| 100 | $0.27 | $27.00 |
| 500 | $0.21 | $105.00 |
| 1,000 | $0.17 | $170.00 |
TLV431IDBVR 概述
A shunt voltage reference such as the TLV431 is functionally a two-terminal analog building block - when biased with a resistor from a higher supply, it conducts current through its cathode-to-anode path to hold its reference pin at the programmed voltage. As a category, voltage references sit alongside linear regulators, supervisors, and ADC/DAC references inside the power management IC hierarchy, and behave as programmable Zener diodes with much tighter tolerance and lower dynamic impedance than discrete components. They are the building blocks of closed-loop SMPS feedback, precision comparators, and adjustable linear regulators.
Key features of the TLV431 family include 1.24 V typical reference with ±1.5% tolerance (the tighter TLV431A grade specifies ±1%), a wide programmable output range of VREF to 6 V, 80 µA typical minimum cathode current, low output impedance of 0.25 Ω typical, and operation across -40 °C to +85 °C industrial/commercial temperatures. The 5-pin SOT-23 (DBV) footprint enables drop-in replacement among TLV431 grades and competitor parts in the same pin-out.
Architecturally, the TLV431 uses a bandgap-derived 1.24 V reference buffer, an internal error amplifier that compares the reference pin to VREF, and a pass transistor that sinks current to regulate the output. The wide cathode operating range and low dynamic impedance allow the regulator to maintain tight output regulation across load and supply variations typical of switching-supply feedback loops.
Typical applications include switching-supply secondary-side feedback, adjustable linear regulator references, isolated point-of-load rails, precision comparator thresholds, and ADC/DAC reference circuits. Engineers may also use the TLV431 as a low-cost, low-power replacement for a TL431 where lower minimum cathode current and a smaller SOT-23-5 package are required.
When designing with the TLV431, size the cathode bias resistor to keep the device above its minimum operating current (80 µA typical) under worst-case load, and add a capacitor on the reference pin if the application demands transient stability. Because the part ships in the small SOT-23-5 outline, expect to follow standard SMD PCB layout practices - minimize reference-pin leakage and route the cathode trace away from switching nodes.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found on the manufacturer datasheet, giving engineers a single reference for sourcing, second-sourcing, and properly biasing the TLV431IDBVR in low-voltage reference designs.
直接替换替代料： TLV431IDBVR ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： TLV431IDBVR （相同外形与封装尺寸） ——差异在于 Adjustable Output Range, MSL Level, Package, Reference Type, Typical Output Impedance.
快速对比工具——选择替代料号进行并排对比：
TLV431AIDBVR
✅ 直接替换📋 参考替代料（不在目录中）
TLV431ACDBVR
✅ 直接替换✓ 有现货
$0.14 / 个
查看数据手册 →TLV431IDBVRG4
✅ 直接替换📋 参考替代料（不在目录中）
TLV431CDBVR
✅ 直接替换📋 参考替代料（不在目录中）
LMV431IM5/NOPB
✅ 直接替换📋 参考替代料（不在目录中）
TS431IYLT
✅ 直接替换📋 参考替代料（不在目录中）
TS431AIYLT
✅ 直接替换📋 参考替代料（不在目录中）
TLV431IDBVR 规格参数
| Reference Type | Adjustable shunt voltage reference |
| Initial Accuracy | ±1.5% (TLV431I grade) |
| Reference Voltage (VREF) | 1.24 V typical |
| Adjustable Output Range | VREF (1.24 V) to 6 V |
| Maximum Cathode Current | 15 mA |
| Minimum Cathode Current (typ.) | 80 µA |
| Typical Output Impedance | 0.25 Ω |
| 工作温度范围 | -40°C to +85°C |
| 封装 | SOT-23-5 (DBV) |
| 引脚数 | 5 |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant |
| MSL 等级 | Level 1 (per JEDEC J-STD-020) |
| Pin Pitch | 0.95 mm |
| 拓扑 | Three-terminal shunt regulator (programmable Zener) |
TLV431IDBVR 引脚配置
| 引脚 1 | REF — Reference pin - voltage feedback node; connect to resistor divider to set output (VOUT = 1.24 V × (1 + R1/R2)) |
| 引脚 2 | ANODE — Anode - tie to ground; reference/cathode currents return through this pin |
| 引脚 3 | CATHODE — Cathode - main current-sinking pin (duplicated with pin 5 to share heat/power dissipation) |
| 引脚 4 | NC — No-connect (reserved/mechanical pad); not used by the circuit |
| 引脚 5 | CATHODE — Cathode (second bond) - tied internally to pin 3 to lower thermal resistance and share 15 mA maximum current |
典型应用
TLV431IDBVR 适用于 6 应用s: Switching-Supply Secondary-Side Feedback, Adjustable Linear Regulator Reference, Precision Comparator Threshold, ADC / DAC Reference Buffer, Isolated Point-of-Load Rails (Post-Regulation), Programmable Zener Diode Replacement.
Switching-Supply Secondary-Side Feedback
The TLV431IDBVR is the canonical secondary-side feedback element in isolated and non-isolated switching supplies, sinking current into the opto-coupler LED when the output rail rises above the programmed threshold. Its 1.24 V VREF and ±1.5% initial accuracy are tight enough to support 5 V/3.3 V rails with a 1% feedback network, and its 6 V maximum output covers the divider-referenced feedback node directly. The 80 µA typical minimum cathode current keeps the part operating during light-load or pre-startup conditions when the main supply is just spinning up. Pair with a TL431-class optocoupler network or a primary-side controller with direct feedback for low-cost isolated DC/DC bricks.
推荐
Adjustable Linear Regulator Reference
By combining a series pass transistor (BJT or MOSFET) with a TLV431IDBVR reference divider, engineers can build a low-cost, low-quiescent adjustable linear regulator with output programmable from 1.24 V to 6 V. The TLV431's reference drives the error amplifier that controls the pass element, regulating the rail against load and line transients. Compared to dedicated LDO ICs this discrete topology is slower and somewhat noisier but remains attractive for sub-100 mA rails, post-regulation of switching converters, or simple bench supplies where BOM cost outweighs performance. Always verify the pass device's safe operating area and add a minimum-load resistor if light-load regulation is critical.
推荐
Precision Comparator Threshold
The TLV431IDBVR works as a precision, programmable comparator threshold that swings between saturation and cutoff at millivolt-level accuracy when the sensed signal crosses its 1.24 V to 6 V reference. Its low 80 µA minimum cathode current lets it work in battery-monitor circuits that must draw essentially zero current when the sensed rail is healthy. The 5-pin SOT-23-5 footprint fits inside even small handheld battery-management layouts, where it pairs with an op-amp comparator or microcontroller ADC channel. Use the divider to set undervoltage, overvoltage, or window thresholds for lithium-cell protection, supercap end-of-discharge detection, or simple power-rail OK signaling.
推荐
ADC / DAC Reference Buffer
For low-resolution SAR ADCs or budget DACs, the TLV431IDBVR can serve as a local point-of-load reference buffer, holding the converter's reference pin at a precise 1.24 V-6 V value without the cost of a dedicated reference IC. With ±1.5% initial accuracy and 0.25 Ω typical dynamic impedance, it is suitable for 8-bit and 10-bit converters but is generally insufficient for 12-bit+ accuracy without calibration or A-grade substitution. Designers typically buffer the output with a low-offset op-amp to drive ADC reference pins, avoiding loading effects that would otherwise degrade linearity. Choose TLV431AIDBVR if 1% initial accuracy is required for the converter error budget.
推荐
Isolated Point-of-Load Rails (Post-Regulation)
When an isolated DC/DC module produces a noisy or loosely-regulated primary rail, designers often feed it into the TLV431IDBVR plus a series pass element to create a clean secondary-side post-regulator. The TLV431 holds the pass device in linear mode and rejects ripple and noise from the upstream converter, providing a quiet 1.24 V to 6 V rail for downstream analog, sensor, or interface circuitry. The SOT-23-5 footprint simplifies co-locating the reference close to the load, minimizing trace-induced reference drift. Compared with a switching post-regulator, this linear topology adds modest dissipation but eliminates switching noise in sensitive analog stages.
推荐
Programmable Zener Diode Replacement
The TLV431IDBVR behaves as a programmable, low-impedance Zener diode whose breakdown voltage is set to any value from 1.24 V to 6 V via two external resistors. With 0.25 Ω typical dynamic impedance it provides a stiffer clamp than discrete Zeners, and the SOT-23-5 form factor lets designers set arbitrary reference rails without stocking multiple Zener voltage grades. Typical uses include logic-level shifting clamps, ESD-supplemental clamps on signal lines, simple 5 V / 3.3 V panel-meter references, and low-cost overvoltage protection on supply rails. Always add a series resistor to limit cathode current to the 15 mA maximum and to set the operating point above the 80 µA minimum.
推荐
推荐产品汇总
工程参考数据： TLV431IDBVR ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | TLV431AIDBVR | TLV431ACDBVR | TLV431IDBVRG4 | TLV431CDBVR | LMV431IM5/NOPB | TS431IYLT | TS431AIYLT |
|---|---|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | STMicroelectronics | STMicroelectronics |
| Package | SOT-23-5 (DBV) | SOT-23-5 (DBV) - same | SOT-23-5 (DBV) - same | SOT-23-5 (DBV) - same | SOT-23-5 (DBV) - same | SOT-23-5 - same | SOT-23-5 - same | SOT-23-5 - same |
| Initial Accuracy | ±1.5% (I grade) | ±1% (A grade) | ±1% (A grade) | ±1.5% (I grade) | Per C-grade spec | ±1.5% | ±2% | ±1% |
| Reference Voltage (VREF) | 1.24 V | 1.24 V | 1.24 V | 1.24 V | 1.24 V | 1.24 V | 1.24 V | 1.24 V |
| Adjustable Output Range | 1.24 V to 6 V | 1.24 V to 6 V | 1.24 V to 6 V | 1.24 V to 6 V | 1.24 V to 6 V | 1.24 V to 30 V (wider) | 1.24 V to 6 V | 1.24 V to 6 V |
| Max Cathode Current | 15 mA | 15 mA | 15 mA | 15 mA | 15 mA | 15 mA | 15 mA | 15 mA |
| Min Cathode Current (typ.) | 80 µA | 80 µA | 80 µA | 80 µA | 80 µA | 80 µA | 60 µA | 60 µA |
| Operating Temperature | -40°C to +85°C | -40°C to +85°C | -40°C to +85°C | -40°C to +85°C | -40°C to +85°C | -40°C to +85°C | -40°C to +85°C | -40°C to +85°C |
| Pricing (qty-100, USD, as of 2026-10) | ~0.27 | ~0.30 | ~0.30 | ~0.27 | ~0.27 | ~0.55 | ~0.32 | ~0.36 |
关键差异点
- Lower minimum cathode current than TL431 (80 µA vs 1 mA) （对比 TL431 family)
- 1.24 V VREF vs 2.495 V on TL431 allows lower-rail references （对比 TL431 family)
- ±1.5% I-grade vs ±1% A-grade option in same footprint （对比 TLV431AIDBVR)
设计说明
Size the cathode bias resistor so the TLV431IDBVR still sources at least 80 µA of cathode current under worst-case load and supply (max VIN, min load). Below this minimum, the internal error amplifier enters its non-linear region and the reference voltage drifts out of spec - the most common symptom is the regulated rail rising above the intended setpoint. Estimated: R_bias = (V_SUPPLY_max - VOUT) / (I_load_max + I_KA_min). Add a small bleed resistor (typically 10 kΩ) from VOUT to ground to keep the device in regulation during zero-load standby.
Because the TLV431IDBVR holds the reference pin at 1.24 V with high input impedance, leakage currents on the reference node can directly shift the programmed output. Route the REF pin away from switching nodes and adjacent high-impedance analog traces, and use a guard ring or minimal copper pour around the pin if contamination is a concern in production. Place the divider resistors and any REF-pin compensation capacitor within 1-2 mm of the package to minimize parasitic impedance. The SOT-23-5 footprint uses two cathode pins (3 and 5) tied together internally - ensure both PCB pads are soldered for proper thermal dissipation.
The TLV431IDBVR dissipates power only as (V_K - V_A) × I_K, where V_K-V_A is roughly VOUT and I_K is up to 15 mA. Estimated: at VOUT = 5 V and I_K = 10 mA the device dissipates 50 mW, which is well within the SOT-23-5's thermal envelope. Higher-output designs with VOUT approaching 6 V or I_K near 15 mA should still verify the junction temperature is below 150 °C using the package's theta_JA value; in most socketed designs on a 1 oz copper 1-square-inch pad the part runs cool without a heatsink.
合规信息
RoHS compliant per TI product information. Not AEC-Q100 qualified - designers requiring automotive-grade equivalents should use TLV431QDBVRQ1 / TL432LIBQDBZRQ1 family parts. Halogen-free status not explicitly stated in verified data - set to 'unknown'.
