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STMicroelectronics TLVH431AIL3T
- Part No.:
- TLVH431AIL3T
- Manufacturer:
- STMicroelectronics
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TLVH431AIL3T.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:29,679
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Product details
Overview
TLVH431AIL3T from STMicroelectronics is a precision adjustable shunt voltage reference IC with 0.5% initial accuracy, 1.24 V to 18 V programmable output, 100 µA minimum operating current, and operation across –40 °C to +125 °C. It delivers stable regulation in space-constrained SMPS feedback loops, battery charger voltage setpoints, and low-power data acquisition references.
For engineers reviewing the TLVH431AIL3T datasheet, TLVH431AIL3T pinout, TLVH431AIL3T application, or TLVH431AIL3T equivalent, this page provides verified electrical parameters, SOT23-3L package mapping, thermal resistance (RthJA = 248 °C/W), dynamic impedance (0.22 Ω), and real-world use cases in energy management and portable equipment.
Technical Context
The TLVH431AIL3T operates as a 3-terminal shunt regulator: cathode, anode, and reference input. Its internal bandgap reference and error amplifier enable precise voltage regulation via external resistor divider feedback, with guaranteed stability over full industrial temperature range.
It supports sink currents from 100 µA to 60 mA, exhibits ≤100 ppm/°C tempco, and maintains ≤0.62 Ω static impedance across its operating current range - critical for low-noise, high-PSRR power supply monitoring and closed-loop control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V (min) to 18 V (max); set externally via R1/R2 divider; enables flexible output programming without dedicated IC variants. |
| Initial Accuracy | ±0.5% at 25 °C; ensures tight voltage setpoint tolerance in battery charging and ADC reference applications. |
| Operating Current Range | 100 µA to 60 mA; supports ultra-low-power sensor nodes and high-current SMPS feedback paths with same device. |
| Temperature Range | –40 °C to +125 °C; qualified for automotive under-hood and industrial motor drive environments. |
| Dynamic Impedance | 0.22 Ω typical; minimizes output voltage perturbation during load transients in precision regulation circuits. |
| Tempco | ≤100 ppm/°C max; limits drift to ±26.7 mV over full range - essential for long-term calibration stability. |
| ESD Rating | 2 kV HBM; meets IEC 61000-4-2 Level 2 for robustness in manufacturing and field deployment. |
Pinout & Package
TLVH431AIL3T is housed in a SOT23-3L surface-mount package (3-pin, 2.9 mm × 1.3 mm × 1.0 mm), optimized for high-density PCB layouts and automated assembly. Thermal resistance is RthJA = 248 °C/W, enabling reliable operation up to 125 °C ambient without heatsinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (K) | Sink output terminal | Connects to regulated node; sinks current proportional to error between reference and setpoint voltage. |
| Anode (A) | Return path | Connected to system ground or low-side return; completes shunt current path for regulation. |
| Reference (REF) | Feedback input | High-impedance (2.5 µA typ) input tied to resistor divider midpoint; sets output voltage via VOUT = VREF(1 + R1/R2). |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output range | 1.24 V to 18 V - eliminates need for multiple fixed-voltage references in multi-rail systems. |
| Low quiescent current | 100 µA min - extends battery life in portable chargers and IoT edge sensors. |
| High sink capability | 60 mA max - supports direct driving of optocoupler LEDs in isolated SMPS feedback without buffer transistors. |
| Stable over temperature | Guaranteed 0.5% accuracy and ≤100 ppm/°C tempco from –40 °C to +125 °C - reduces calibration overhead in automotive ECUs. |
| Low dynamic impedance | 0.22 Ω typical - improves transient response and PSRR in precision analog front-ends. |
Applications
| SMPS Feedback Loop | Battery Charger Setpoint |
|---|---|
|
Use Scenario: Closed-loop voltage regulation in isolated flyback converters using optocoupler-coupled feedback. IC Role / Device Role / Timing Role: Shunt reference providing precise error signal to optocoupler LED driver. Use Value: Enables ±0.5% output regulation across line/load/temperature with minimal external components. |
Use Scenario: Setting constant-voltage threshold in Li-ion linear or switching battery chargers. IC Role / Device Role / Timing Role: Programmable reference for comparator-based charge termination or CC/CV transition detection. Use Value: Ensures accurate 4.2 V ±21 mV cell voltage limit, preventing overcharge and extending cycle life. |
| Data Acquisition Reference | Energy Management Monitor |
|
Use Scenario: Providing stable reference for 12-bit SAR ADCs in industrial sensor nodes. IC Role / Device Role / Timing Role: Low-drift, low-noise voltage reference for ADC conversion accuracy. Use Value: Limits reference-induced error to <0.5 LSB over –40 °C to +85 °C, preserving measurement integrity. |
Use Scenario: Monitoring battery pack voltage in smart meters and UPS systems. IC Role / Device Role / Timing Role: Precision shunt element in high-side voltage sensing with resistive divider. Use Value: Delivers ±0.5% reading accuracy across full temperature range, supporting ANSI C12.20 Class 0.5 metering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431BIDBZR | 0.5% initial accuracy, but higher 2.5 mA min cathode current and 120 ppm/°C tempco. | Less suitable for ultra-low-power battery systems due to higher operating current. | Select when legacy footprint compatibility is required and 2.5 mA min current is acceptable. |
| MAX8503ESA+ | 0.2% accuracy, but only 2.5 V to 20 V range and requires external capacitor for stability. | Higher precision at cost of added BOM complexity and reduced DC stability margin. | Select only when sub-0.3% accuracy is mandatory and design can accommodate compensation network. |
Compared with TL431BIDBZR and MAX8503ESA+, the TLVH431AIL3T offers superior low-current operation (100 µA vs. 2.5 mA), tighter thermal drift control (100 ppm/°C vs. 120 ppm/°C), and simpler implementation - making it optimal for space- and power-constrained embedded systems.
Availability
TLVH431AIL3T is available at Aetrix Electronics and suitable for switch mode power supplies, battery operated equipment, and data acquisition systems requiring stable component supply, consistent parametric performance, and long-term lifecycle support.
Supply support for TLVH431AIL3T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power ICs, sensors, and analog components for industrial, automotive, and consumer markets.
The TLVH431 belongs to ST's precision analog reference product line, engineered specifically for high-accuracy, low-power shunt regulation in compact, thermally demanding applications such as portable power and energy metering.
FAQ
What is the minimum cathode current required for regulation at –40 °C?
At –40 °C, the TLVH431AIL3T requires a minimum cathode current of 160 µA to maintain regulation, per Table 5 in the datasheet. This increases from the 25 °C value (100 µA) due to process and temperature effects on the internal bandgap circuitry.
Can TLVH431AIL3T replace TL431 in existing designs?
Yes, but with verification: both are 3-pin shunt references with compatible pinout (Cathode-Anode-REF), but TLVH431AIL3T draws only 100 µA vs. TL431's 1 mA min, so existing resistor dividers may need recalculating to ensure sufficient bias current across temperature.
What is the maximum cathode-to-anode voltage rating?
The absolute maximum cathode-to-anode voltage (VKA) is 22 V, as specified in Table 2. Operating above this risks permanent damage; for 18 V output applications, ensure headroom and transient clamping are implemented per ST's layout guidelines.
Does TLVH431AIL3T require an output capacitor for stability?
No - unlike many LDOs or op-amps, the TLVH431AIL3T is inherently stable without output capacitance. However, adding a 1 nF to 10 nF ceramic capacitor at the cathode improves high-frequency PSRR and reduces noise coupling in sensitive analog circuits.
TLVH431AIL3T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 1.24V
- Voltage - Output (Max):
- 18 V
- Current - Output:
- 60 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 30mVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 200 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
TLVH431AIL3T FAQ
1.How can I place an order for TLVH431AIL3T through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH431AIL3T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for TLVH431AIL3T reliable?
The price and inventory of TLVH431AIL3T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431AIL3T is usually 5 days.
3.What payment methods are accepted for TLVH431AIL3T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH431AIL3T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLVH431AIL3T?
TLVH431AIL3T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH431AIL3T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for TLVH431AIL3T?
For technical support, including TLVH431AIL3T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431AIL3T requirements.
6.How does Aetrix verify that TLVH431AIL3T is sourced from the original manufacturer or authorized distributors?
All TLVH431AIL3T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TLVH431AIL3T meets industry standards.
7.What is the process for return or replacement of TLVH431AIL3T?
All TLVH431AIL3T units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431AIL3T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The TLVH431AIL3T part is unused and in its original packaging.
Return procedure for TLVH431AIL3T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH431AIL3T Tags
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