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Texas Instruments TLVH431QDBZTG4
- Part No.:
- TLVH431QDBZTG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TLVH431QDBZTG4.pdf
- Description:
- IC VREF SHUNT ADJ 1.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,826
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Product details
Overview
TLVH431QDBZTG4 from Texas Instruments is a low-voltage adjustable precision shunt regulator in SOT-23-3 package, featuring 1.24 V reference voltage (±0.5% at 25°C), –40°C to +125°C operation, and 0.25 Ω typical dynamic impedance. It functions as a programmable Zener replacement or error amplifier in isolated flyback SMPS feedback loops.
For engineers reviewing the TLVH431QDBZTG4 datasheet, TLVH431QDBZTG4 pinout, TLVH431QDBZTG4 application, or TLVH431QDBZTG4 equivalent, key selection criteria include cathode current range (100 μA–70 mA), reference voltage tolerance grade (Q-grade ±0.5%), thermal stability over automotive temperature range, and compatibility with optocoupler-based secondary-side regulation.
Technical Context
The TLVH431QDBZTG4 implements a three-terminal shunt topology with internal 1.24 V bandgap reference and high-gain NPN-based error amplifier driving a Darlington sink output stage. Its open-loop mode enables comparator functionality with integrated reference; closed-loop configuration supports precise voltage regulation via resistive divider feedback between cathode and reference pins.
It operates down to 1.24 V cathode-anode voltage with no external compensation required, achieves sharp turn-on due to active output circuitry, and maintains stable regulation across 100 μA–70 mA cathode current while delivering 0.25 Ω typical dynamic impedance at 10 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V ±0.5% at 25°C; defines minimum programmable output voltage and sets accuracy baseline for all regulated voltages. |
| Operating Temperature | –40°C to +125°C; qualified for automotive under-hood and industrial control applications requiring extended thermal robustness. |
| Cathode Current Range | 100 μA to 70 mA; enables low-power monitoring and high-current shunt regulation without external gain staging. |
| Dynamic Impedance | 0.25 Ω typical at 10 mA; ensures tight voltage regulation under load transients and minimizes output ripple in feedback paths. |
| Reference Input Current | 0.1–0.5 μA; allows high-impedance resistor networks (e.g., >1 MΩ) without degrading reference accuracy or regulation stability. |
| Voltage Regulation Range | VREF to 18 V; supports wide output adjustment using two external resistors, compatible with 3.3 V, 5 V, and 12 V system rails. |
| Output Noise | 20 nV/√Hz at 1 kHz; low noise performance preserves signal integrity in precision data converter references and sensor biasing. |
Pinout & Package
SOT-23-3 package (2.92 mm × 1.30 mm body size) with gull-wing leads; thermally enhanced for power dissipation up to 360 mW at TA = 25°C (θJA = 206°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CATHODE | Shunt current input / output node | Primary current path; sinks regulated current to maintain reference voltage at REF pin; connects to feedback network output or optocoupler LED anode. |
| 2 - ANODE | Common return / ground reference | Low-impedance return path for cathode current and reference bias; must be connected to system ground or lowest potential point in shunt loop. |
| 3 - REF | Feedback input / threshold sense | High-impedance input sensing voltage divider output; compares against internal 1.24 V reference to control cathode conduction. |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | 1.24 V reference enables regulation in 1.8 V, 2.5 V, and 3.3 V systems where standard TL431 (2.5 V) cannot function. |
| Ultra-low reference current | 0.1–0.5 μA input current permits use of high-value feedback resistors, reducing power loss and improving battery life in portable designs. |
| Automotive-grade temperature range | –40°C to +125°C operation with Q-grade tolerance ensures reliability in engine control units, ADAS modules, and infotainment power supplies. |
| Stable without output capacitor | Internally compensated design eliminates need for cathode-to-anode bypass capacitor, simplifying layout and reducing BOM count in space-constrained PCBs. |
| Sharp turn-on characteristic | Active output stage delivers fast response (<1 µs rise time) for overvoltage detection and precision clamping in safety-critical monitoring circuits. |
Applications
| Isolated Flyback SMPS Feedback | Adjustable Voltage Reference for ADCs |
|---|---|
Use Scenario: Secondary-side voltage regulation in 3.3 V isolated flyback converters using optocoupler feedback. IC Role / Device Role / Timing Role: Precision shunt regulator and error amplifier; compares sampled output voltage against 1.24 V reference to drive optocoupler LED current. Use Value: Enables regulation down to 2.7 V output (1.24 V + opto VF) with <±1% total error across temperature, replacing discrete Zener + op-amp solutions. |
Use Scenario: Providing stable, low-drift reference voltage for SAR and delta-sigma ADCs in industrial data acquisition systems. IC Role / Device Role / Timing Role: Adjustable precision reference source; configured with 0.1% resistors to generate exact 2.048 V or 4.096 V reference for 12-bit to 16-bit converters. Use Value: Delivers 0.5% initial accuracy and <31 mV full-range drift over –40°C to +125°C, eliminating need for calibration in field-deployed sensors. |
| Power Rail Voltage Monitoring | Comparator with Integrated Reference |
Use Scenario: Undervoltage lockout (UVLO) and overvoltage protection (OVP) for 5 V and 12 V microcontroller supply rails. IC Role / Device Role / Timing Role: Threshold detector; REF pin biased by resistor divider from monitored rail; CATHODE pulled low when threshold exceeded. Use Value: Replaces dual-component (Zener + transistor) UVLO circuits with single device, reducing board area by 60% and improving trip-point repeatability to ±1.5%. |
Use Scenario: Level-shifting and logic-level comparison for analog sensor outputs (e.g., temperature, pressure) interfacing to digital controllers. IC Role / Device Role / Timing Role: Open-loop comparator with built-in 1.24 V reference; drives digital input directly without external reference IC or resistor ladder. Use Value: Reduces component count by 3–4 parts per channel and eliminates external reference drift, enabling accurate 100 mV–5 V window detection with <10 μs response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431BDBZRG4 | Same SOT-23-3 package and pinout; 0.5% reference tolerance at 25°C but rated only to +85°C (I-grade), not +125°C. | Limited to commercial/industrial ambient environments; unsuitable for under-hood automotive use. | Select when cost sensitivity outweighs extended temperature requirement and system ambient stays below 85°C. |
| TLVH432QDBZTG4 | Identical electrical specs and Q-grade rating, but alternate SOT-23-3 pinout: REF on Pin 1, CATHODE on Pin 2, ANODE on Pin 3. | Requires PCB layout revision; incompatible with TLVH431QDBZTG4 footprint without trace modification. | Choose only if existing design uses TLVH432 pinout or new layout accommodates swapped REF/CATHODE placement. |
Compared with TLVH431BDBZRG4, TLVH431QDBZTG4 provides guaranteed operation up to +125°C for automotive applications, while TLVH432QDBZTG4 offers identical performance with reversed pin assignment-neither is pin-compatible without hardware changes.
Availability
TLVH431QDBZTG4 is available at Aetrix Electronics and suitable for automotive power management, industrial sensor interfaces, and isolated DC-DC converter designs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TLVH431QDBZTG4 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 leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in precision reference and power IC design.
The TLVH431 family was developed to extend shunt regulator capability into low-voltage domains (down to 1.24 V) for next-generation power supplies, data converters, and automotive subsystems demanding high accuracy and thermal resilience.
FAQ
What is the reference voltage tolerance of TLVH431QDBZTG4 at 25°C?
The TLVH431QDBZTG4 has a reference voltage tolerance of ±0.5% at 25°C, corresponding to a 1.24 V nominal value ranging from 1.234 V to 1.246 V. This B-grade accuracy is specified across the full –40°C to +125°C operating range, with maximum deviation of ±31 mV over temperature.
Can TLVH431QDBZTG4 replace a standard Zener diode in low-leakage applications?
Yes, TLVH431QDBZTG4 serves as a superior Zener replacement with off-state cathode current as low as 0.02 μA at 18 V and 25°C-over 100× lower than typical 1N47xx Zeners. Its active regulation, sharp knee, and temperature-stable 1.24 V reference make it ideal for precision biasing and low-power monitoring where Zener leakage and drift degrade performance.
What is the minimum cathode current required for regulation in TLVH431QDBZTG4?
The TLVH431QDBZTG4 requires a minimum cathode current of 100 μA to maintain regulation, verified across –40°C to +125°C. Below this threshold, gain drops significantly and regulation becomes unstable. Designers must ensure external bias networks deliver ≥100 μA under worst-case conditions, including low-temperature and low-input-voltage scenarios.
Does TLVH431QDBZTG4 require an output capacitor for stability?
No, TLVH431QDBZTG4 is internally compensated and remains stable without a cathode-to-anode output capacitor. However, if added for noise filtering or transient suppression, capacitor selection must follow TI's phase margin curves (Figures 5-15 to 5-17) to avoid oscillation-especially with capacitive loads exceeding 100 pF at higher cathode voltages.
How does the TLVH431QDBZTG4 pinout differ from TLVH432 variants?
TLVH431QDBZTG4 uses Pin 1 = CATHODE, Pin 2 = ANODE, Pin 3 = REF. TLVH432QDBZTG4 swaps Pins 1 and 2: Pin 1 = REF, Pin 2 = CATHODE, Pin 3 = ANODE. Though electrically identical and Q-grade qualified, this reversal makes them non-interchangeable without PCB redesign-no pin-to-pin compatibility exists between TLVH431QDBZTG4 and TLVH432 variants.
TLVH431QDBZTG4 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:
- 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:
- ±1.5%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 100 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
TLVH431QDBZTG4 FAQ
1.How can I place an order for TLVH431QDBZTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH431QDBZTG4 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 TLVH431QDBZTG4 reliable?
The price and inventory of TLVH431QDBZTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431QDBZTG4 is usually 5 days.
3.What payment methods are accepted for TLVH431QDBZTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH431QDBZTG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLVH431QDBZTG4?
TLVH431QDBZTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH431QDBZTG4 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 TLVH431QDBZTG4?
For technical support, including TLVH431QDBZTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431QDBZTG4 requirements.
6.How does Aetrix verify that TLVH431QDBZTG4 is sourced from the original manufacturer or authorized distributors?
All TLVH431QDBZTG4 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 TLVH431QDBZTG4 meets industry standards.
7.What is the process for return or replacement of TLVH431QDBZTG4?
All TLVH431QDBZTG4 units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431QDBZTG4, 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 TLVH431QDBZTG4 part is unused and in its original packaging.
Return procedure for TLVH431QDBZTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH431QDBZTG4 Tags
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TL431AIDBZR
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TL431BQDBZR
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AZ431LBNTR-G1
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
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LM4040DIM3X-2.5/NOPB
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AZ431LANTR-G1
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