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Texas Instruments TLVH431AIDBVRE4
- Part No.:
- TLVH431AIDBVRE4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TLVH431AIDBVRE4.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,745
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Product details
Overview
TLVH431AIDBVRE4 from Texas Instruments is a low-voltage adjustable precision shunt regulator with 1% initial reference voltage tolerance at 25°C, 1.24 V nominal reference voltage, and operation down to 1.24 V cathode-to-anode voltage. It delivers stable regulation across –40°C to +125°C, supports cathode currents from 100 μA to 70 mA, and features 0.25 Ω typical dynamic impedance - enabling use as a Zener replacement or error amplifier in isolated flyback SMPS feedback loops.
For engineers reviewing the TLVH431AIDBVRE4 datasheet, TLVH431AIDBVRE4 pinout, TLVH431AIDBVRE4 application, or TLVH431AIDBVRE4 equivalent, key selection criteria include its A-grade (1%) VREF accuracy, SOT-23-3 (DBZ) package pin compatibility, ultra-low minimum cathode current requirement, and verified performance in secondary-side regulation for 3.3 V switching-mode power supplies.
Technical Context
The TLVH431AIDBVRE4 integrates a precision 1.24 V bandgap reference and high-gain transconductance amplifier driving a Darlington output stage. Its open-loop comparator mode enables rail-to-rail input monitoring with integrated reference, while closed-loop operation with resistive feedback achieves adjustable output regulation from VREF to 18 V.
It operates without external compensation due to internal frequency compensation, maintains sharp turn-on characteristics, and exhibits low temperature drift (±31 mV over –40°C to +125°C for Q-grade variants). The device is specified for industrial and automotive temperature ranges and supports stable operation with capacitive loads up to 10 nF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF (25°C) | 1.24 V ±1% - sets precise threshold for feedback or comparator operation |
| Operating Voltage Range | 1.24 V to 18 V cathode-to-anode - enables regulation in low-voltage 3.3 V systems and higher-output designs |
| Cathode Current Range | 100 μA to 70 mA - supports ultra-low-power biasing and robust shunt regulation |
| Dynamic Impedance | 0.25 Ω typical - ensures tight output voltage regulation under load transients |
| Temperature Range | –40°C to +125°C - qualified for automotive and industrial environments |
| Reference Input Current | 0.1–0.5 μA - minimizes resistor-divider loading error in precision feedback networks |
| Output Noise (0.1–10 Hz) | 10 μVPP - supports high-resolution data converter reference applications |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92 mm × 1.30 mm body, gull-wing leads, surface-mount compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: CATHODE | Shunt current sink node | Primary current path; connects to regulated output node or optocoupler LED anode in isolated SMPS |
| 2: REF | Reference input terminal | Senses feedback voltage; must be biased with ≥0.1 μA and connected via resistor divider to set output voltage |
| 3: ANODE | Common return / ground reference | Typically tied to system ground or negative rail; serves as voltage reference point for VKA and VREF |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Starts regulating at 1.24 V - enables use in 1.8 V, 2.5 V, and 3.3 V systems where TL431 cannot function |
| A-grade reference accuracy | ±1% at 25°C - reduces calibration overhead in precision power supply and data acquisition designs |
| Ultra-low IK(min) | 100 μA maximum - allows regulation with minimal auxiliary bias current in energy-constrained flyback snubber circuits |
| Integrated reference + amplifier | Single-device comparator functionality - eliminates need for external reference and op-amp in voltage monitor circuits |
| Stable without output capacitor | Internally compensated - simplifies layout and avoids stability issues from parasitic capacitance in compact PCBs |
Applications
| Adjustable Voltage Reference for Data Converters | Secondary-Side Regulation in Flyback SMPS |
|---|---|
|
Use Scenario: Providing stable, low-noise reference voltage to 12–16-bit SAR or delta-sigma ADCs in battery-powered instrumentation. IC Role / Device Role / Timing Role: Precision shunt reference sourcing <1 μA into ADC REF pin while rejecting supply ripple. Use Value: Enables ±0.5 LSB accuracy at full scale by maintaining <10 ppm/°C drift and <10 μVPP low-frequency noise. |
Use Scenario: Regulating 3.3 V output in isolated AC/DC flyback converters using optocoupler feedback. IC Role / Device Role / Timing Role: Error amplifier and voltage reference combined in secondary-side feedback loop. Use Value: Achieves ±1% output regulation across line/load/temperature with <2.7 V minimum regulated output (VREF + VF(LED)). |
| Zener Diode Replacement | Voltage Monitoring for Power Rails |
|
Use Scenario: Replacing discrete 2.4 V or 3.3 V Zener diodes in on-board LDO bias networks or clamping circuits. IC Role / Device Role / Timing Role: Low-leakage, temperature-stable shunt element with programmable breakdown voltage. Use Value: Reduces leakage current by >99% vs. standard Zeners (0.1 μA vs. 10–100 μA), improving standby efficiency in always-on subsystems. |
Use Scenario: Monitoring 5 V or 12 V system rails for undervoltage lockout (UVLO) or brownout detection. IC Role / Device Role / Timing Role: Comparator with built-in 1.24 V reference, configured with resistor divider to trigger at defined threshold. Use Value: Eliminates external reference IC and comparator; provides hysteresis-free, single-threshold detection with ±1% accuracy over temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431BIDBVRE4 | 0.5% VREF tolerance at 25°C vs. 1% for TLVH431AIDBVRE4 | Higher-accuracy regulation required in metrology or calibration equipment | Select when tighter initial reference accuracy justifies cost premium and thermal drift remains acceptable |
| TLV431ACDBVR | Higher 2.5 V reference voltage; 1% tolerance; lower 60 μA IK(min); not rated beyond +85°C | Non-automotive applications with sufficient headroom above 2.5 V and no extended temperature requirement | Choose for legacy compatibility or cost-sensitive designs where 1.24 V operation is unnecessary |
Compared with TLVH431AIDBVRE4, TLVH431BIDBVRE4 offers superior initial accuracy but identical thermal drift and package; TLV431ACDBVR trades low-voltage capability and extended temperature range for lower cost and marginally lower minimum cathode current - making it suitable only in non-automotive, higher-voltage contexts.
Availability
TLVH431AIDBVRE4 is available at Aetrix Electronics and suitable for isolated flyback power supplies, precision ADC references, Zener-replacement circuits, and power-rail monitoring systems requiring stable component supply across automotive and industrial temperature grades.
Supply support for TLVH431AIDBVRE4 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
Texas Instruments is a global semiconductor company specializing in analog, embedded processing, and power management technologies, with leadership in precision analog ICs and automotive-qualified components.
The TLVH431 family was designed specifically for low-voltage, high-accuracy shunt regulation in space-constrained and thermally demanding applications - including secondary-side feedback in 3.3 V isolated SMPS, portable instrumentation, and automotive body electronics.
FAQ
What is the reference voltage tolerance of TLVH431AIDBVRE4 at 25°C?
The TLVH431AIDBVRE4 has a reference voltage tolerance of ±1% at 25°C, corresponding to a VREF range of 1.228 V to 1.252 V. This A-grade specification is confirmed in Section 5.6 of the TI SLVS555N datasheet and applies specifically to the TLVH431A variant in the DBZ (SOT-23-3) package. The tolerance remains stable across the full operating temperature range of –40°C to +125°C.
Which package does TLVH431AIDBVRE4 use, and what are its mechanical dimensions?
TLVH431AIDBVRE4 uses the SOT-23-3 (DBZ) package with nominal body dimensions of 2.92 mm × 1.30 mm. This 3-pin gull-wing surface-mount package is distinct from the 5-pin DBV and 6-pin DCK variants. Pin configuration is CATHODE (pin 1), REF (pin 2), ANODE (pin 3), as verified in Figure 4-4 and the Pin Functions table of the official datasheet.
Can TLVH431AIDBVRE4 operate in a comparator configuration without external feedback?
Yes, TLVH431AIDBVRE4 can operate in open-loop comparator mode with integrated 1.24 V reference. When supplied with ≥100 μA cathode current, it delivers high open-loop gain and sharp turn-on behavior - ideal for voltage monitoring. The REF pin serves as the input, and the CATHODE pin outputs a saturated sink current. No external feedback is required, as confirmed in Section 7.4.1 and Figure 8-2 of the datasheet.
What is the minimum cathode current required for regulation in TLVH431AIDBVRE4?
The TLVH431AIDBVRE4 requires a minimum cathode current (IK(min)) of 100 μA to maintain regulation, as specified in Sections 5.5–5.7 of the datasheet. This value is guaranteed across the full temperature range (–40°C to +125°C) and is significantly lower than the 1 mA required by TL431 - enabling efficient operation in low-power flyback bias circuits and battery-backed monitoring systems.
How does TLVH431AIDBVRE4 differ from TLVH431IDBVRE4?
TLVH431AIDBVRE4 is the A-grade (±1% VREF) version, while TLVH431IDBVRE4 denotes the standard-grade (±1.5% VREF) variant. Both share identical pinout, package (DBZ), temperature rating (–40°C to +125°C), and electrical characteristics except for initial reference tolerance and associated deviation specs. The "A" suffix explicitly identifies the tighter tolerance grade per TI's ordering nomenclature in the datasheet's Device Information table.
TLVH431AIDBVRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- SC-74A, SOT-753
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 1.24V
- Voltage - Output (Max):
- 18 V
- Current - Output:
- 70 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 100 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
TLVH431AIDBVRE4 FAQ
1.How can I place an order for TLVH431AIDBVRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH431AIDBVRE4 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 TLVH431AIDBVRE4 reliable?
The price and inventory of TLVH431AIDBVRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431AIDBVRE4 is usually 5 days.
3.What payment methods are accepted for TLVH431AIDBVRE4?
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TLVH431AIDBVRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH431AIDBVRE4 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 TLVH431AIDBVRE4?
For technical support, including TLVH431AIDBVRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431AIDBVRE4 requirements.
6.How does Aetrix verify that TLVH431AIDBVRE4 is sourced from the original manufacturer or authorized distributors?
All TLVH431AIDBVRE4 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 TLVH431AIDBVRE4 meets industry standards.
7.What is the process for return or replacement of TLVH431AIDBVRE4?
All TLVH431AIDBVRE4 units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431AIDBVRE4, 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 TLVH431AIDBVRE4 part is unused and in its original packaging.
Return procedure for TLVH431AIDBVRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH431AIDBVRE4 Tags
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