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Texas Instruments TLVH431CDBZR
- Part No.:
- TLVH431CDBZR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TLVH431CDBZR.pdf
- Description:
- IC VREF SHUNT ADJ 1.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,262
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Product details
Overview
TLVH431CDBZR from Texas Instruments is a low-voltage adjustable precision shunt regulator in SOT-23-3 package, featuring 1.24 V reference voltage (±1.5% at 25°C), 100 μA to 70 mA cathode current range, and operation from –40°C to +125°C. It functions as an error amplifier or comparator with integrated reference in isolated flyback SMPS feedback loops, voltage monitoring circuits, and low-leakage Zener replacement applications.
For engineers reviewing the TLVH431CDBZR datasheet, TLVH431CDBZR pinout, TLVH431CDBZR application, or TLVH431CDBZR equivalent, key selection criteria include reference voltage tolerance, minimum cathode current for regulation, dynamic impedance, thermal stability across industrial temperature ranges, and compatibility with optocoupler-based secondary-side regulation topologies.
Technical Context
The TLVH431CDBZR implements a three-terminal shunt topology with internal 1.24 V bandgap reference and high-gain transconductance amplifier driving a Darlington output stage. Its open-loop configuration enables comparator operation with built-in reference; closed-loop use with resistive feedback sets output voltage from 1.24 V to 18 V.
It achieves 0.25 Ω typical dynamic impedance and supports stable operation without external compensation capacitors. The device operates down to 1.24 V cathode-anode voltage and maintains specified performance over –40°C to +125°C, making it suitable for automotive and industrial power rail monitoring and regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V ±1.5% at 25°C - sets precise threshold for feedback or comparison without external reference |
| Cathode Current Range | 100 μA to 70 mA - enables regulation at ultra-low bias currents and supports high-current shunt applications |
| Dynamic Impedance | 0.25 Ω typical - ensures tight voltage regulation under varying load conditions |
| Operating Temperature | –40°C to +125°C - qualified for automotive under-hood and industrial control environments |
| Output Voltage Range | 1.24 V to 18 V (adjustable via two external resistors) - replaces fixed Zeners and supports wide-range power supply designs |
| Reference Input Current | 0.1–0.5 μA - minimizes resistor-divider loading error in precision voltage-setting networks |
| Off-State Cathode Current | 0.02–0.1 μA - enables low-power monitoring and battery-backed voltage supervision |
Pinout & Package
SOT-23-3 package (2.92 mm × 1.30 mm body size), surface-mount, lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE | Shunt current input/output node | Carries regulated current; connects to feedback network or optocoupler LED anode in isolated supplies |
| REF | Reference input terminal | Senses divided output voltage; must be biased with ≥0.1 μA to maintain regulation accuracy |
| ANODE | Common return path | Typically connected to system ground or negative rail; serves as reference point for all internal voltages |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Starts regulating at 1.24 V cathode-anode voltage - enables use in 1.8 V, 2.5 V, and 3.3 V systems where TL431 cannot function |
| Ultra-low reference input current | 0.1–0.5 μA - reduces divider resistor power loss and improves accuracy in high-impedance sensing networks |
| High thermal stability | VREF deviation ≤31 mV over –40°C to +125°C (TLVH431Q grade) - eliminates need for external temperature compensation |
| Internal compensation | Stable without output capacitor - simplifies layout and avoids phase-margin issues in feedback loops |
| Sharp turn-on characteristic | Active output circuitry provides fast transition between off and regulation states - improves response in overvoltage detection |
Applications
| Adjustable Voltage Reference for Data Converters | Secondary-Side Regulation in Flyback SMPS |
|---|---|
Use Scenario: Precision ADC/DAC reference in battery-powered sensor nodes requiring low quiescent current and stable 1.24–5 V references. IC Role / Device Role / Timing Role: Adjustable shunt reference providing accurate, temperature-stable voltage setpoint for converter analog front-end. Use Value: 1.24 V minimum reference voltage and 0.1 μA reference input current enable direct interface with low-voltage microcontrollers and reduce power consumption by >90% vs. TL431-based solutions. |
Use Scenario: Isolated feedback path in 3.3 V/5 V offline flyback converters using optocouplers for safety-critical AC/DC adapters. IC Role / Device Role / Timing Role: Error amplifier and voltage reference combined in single device on secondary side, controlling optocoupler LED current. Use Value: Enables regulated output as low as 2.7 V DC with <31 mV VREF drift over temperature - critical for meeting tight output tolerance in USB PD and industrial power supplies. |
| Zener Diode Replacement | Voltage Monitoring for Power Rails |
Use Scenario: Replacing 2.5 V or 3.3 V Zener diodes in on-board regulation and LDO pre-biasing circuits where leakage and temperature drift are problematic. IC Role / Device Role / Timing Role: Precision shunt regulator with active control, replacing passive Zener junction behavior. Use Value: 0.02 μA off-state cathode current and 0.25 Ω dynamic impedance deliver 10× lower leakage and 50× better regulation than standard 5% Zeners. |
Use Scenario: Real-time monitoring of 1.8 V, 2.5 V, or 3.3 V FPGA/CPU core rails in telecom base stations and industrial PLCs. IC Role / Device Role / Timing Role: Comparator with integrated reference detecting undervoltage or overvoltage events on digital supply rails. Use Value: Built-in 1.24 V reference and open-loop gain >10,000 allow reliable trip-point setting within ±1.5% without external components - reducing BOM count and board space. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431IDBZR | Same SOT-23-3 package; rated for –40°C to +85°C (I-grade) vs. C-grade's 0°C to +70°C; tighter 1% VREF tolerance | Better suited for extended-temperature industrial controls where full automotive range is unnecessary | Select TLVH431IDBZR when operating ambient exceeds 70°C but does not reach 125°C, and higher initial accuracy is required |
| TLVH432CDBZR | Different pinout (REF–CATHODE–ANODE vs. CATHODE–REF–ANODE); identical electrical specs and SOT-23-3 mechanical footprint | Requires PCB layout revision due to reversed REF/CATHODE pins; used where alternate routing simplifies feedback trace paths | Choose TLVH432CDBZR only if existing layout accommodates its pin assignment or new design benefits from its signal flow orientation |
Compared with TLVH431CDBZR, TLVH431IDBZR offers wider temperature coverage and improved initial accuracy at no cost to footprint or functionality, while TLVH432CDBZR provides identical performance in a pinout variant that may simplify specific feedback loop layouts but mandates schematic and layout updates.
Availability
TLVH431CDBZR is available at Aetrix Electronics and suitable for isolated flyback SMPS designs, precision voltage monitoring systems, and low-voltage data converter reference circuits requiring stable component supply across automotive, industrial, and telecom production programs.
Supply support for TLVH431CDBZR 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 ICs, with leadership in precision analog and high-reliability power solutions.
The TLVH431 family was designed specifically for low-voltage shunt regulation and error amplification in isolated power supplies and precision monitoring applications - extending the TL431 architecture to sub-2.5 V operation with enhanced thermal stability and reduced quiescent current.
FAQ
What is the reference voltage tolerance of TLVH431CDBZR at 25°C?
The TLVH431CDBZR has a reference voltage tolerance of ±1.5% at 25°C, corresponding to a 1.24 V nominal value ranging from 1.221 V to 1.259 V. This tolerance is specified for the 'C' grade variant and applies across the 0°C to +70°C operating range. The device maintains this accuracy without external trimming or calibration, making TLVH431CDBZR suitable for cost-sensitive industrial applications where moderate initial precision is acceptable.
Can TLVH431CDBZR operate with cathode-to-anode voltage below 2.5 V?
Yes, TLVH431CDBZR is explicitly designed for low-voltage operation starting at 1.24 V cathode-to-anode voltage - significantly lower than the 2.5 V minimum required by TL431. This allows TLVH431CDBZR to regulate outputs as low as 1.24 V directly, or 2.7 V in optocoupler-coupled flyback configurations. Operation below 1.24 V is not functional, as the internal reference requires sufficient headroom to bias the amplifier and Darlington output stage.
What is the minimum cathode current required for regulation in TLVH431CDBZR?
The TLVH431CDBZR requires a minimum cathode current of 100 μA to maintain regulation, as specified in the datasheet under recommended operating conditions. Below this threshold, open-loop gain drops and regulation becomes unstable. This value is confirmed for the 'C' grade at 25°C and remains valid up to 70°C. Designers must ensure external bias networks or feedback paths supply ≥100 μA to the cathode pin under all operating conditions to guarantee TLVH431CDBZR performance.
How does TLVH431CDBZR differ from TLVH432CDBZR?
TLVH431CDBZR and TLVH432CDBZR share identical electrical specifications, thermal ratings, and SOT-23-3 package dimensions, but differ exclusively in pinout: TLVH431CDBZR uses CATHODE–REF–ANODE ordering, while TLVH432CDBZR uses REF–CATHODE–ANODE. This difference affects PCB layout and schematic symbol placement but does not alter TLVH431CDBZR functionality or performance. Interchange requires physical layout revision - they are not pin-compatible replacements.
Is TLVH431CDBZR suitable for automotive applications?
TLVH431CDBZR is rated for 0°C to +70°C operation (C-grade), which covers commercial and some industrial environments but not full automotive AEC-Q100 temperature ranges. For automotive under-hood applications requiring –40°C to +125°C, the TLVH431QDBZR (Q-grade) variant should be selected instead. TLVH431CDBZR may be used in automotive infotainment or cabin modules with controlled ambient, but TI does not qualify the 'C' grade for under-hood deployment - always verify ambient thermal profile before selecting TLVH431CDBZR for automotive use.
TLVH431CDBZR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- 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:
- 70 mA
- Tolerance:
- ±1.5%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 100 µA
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
TLVH431CDBZR FAQ
1.How can I place an order for TLVH431CDBZR through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH431CDBZR 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 TLVH431CDBZR reliable?
The price and inventory of TLVH431CDBZR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431CDBZR is usually 5 days.
3.What payment methods are accepted for TLVH431CDBZR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH431CDBZR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLVH431CDBZR?
TLVH431CDBZR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH431CDBZR 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 TLVH431CDBZR?
For technical support, including TLVH431CDBZR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431CDBZR requirements.
6.How does Aetrix verify that TLVH431CDBZR is sourced from the original manufacturer or authorized distributors?
All TLVH431CDBZR 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 TLVH431CDBZR meets industry standards.
7.What is the process for return or replacement of TLVH431CDBZR?
All TLVH431CDBZR units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431CDBZR, 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 TLVH431CDBZR part is unused and in its original packaging.
Return procedure for TLVH431CDBZR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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