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Texas Instruments TLVH431BIDBZTG4
- Part No.:
- TLVH431BIDBZTG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TLVH431BIDBZTG4.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,526
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Product details
Overview
TLVH431BIDBZTG4 from Texas Instruments is a low-voltage adjustable precision shunt regulator in SOT-23-3 package, featuring 0.5% initial reference voltage tolerance (1.24 V at 25°C), 100 μA minimum cathode current for regulation, and operation across –40°C to +125°C. It serves as a programmable voltage reference or error amplifier in isolated flyback SMPS feedback loops, replacing Zener diodes with lower leakage and sharper turn-on.
For engineers reviewing the TLVH431BIDBZTG4 datasheet, TLVH431BIDBZTG4 pinout, TLVH431BIDBZTG4 application, or TLVH431BIDBZTG4 equivalent, key selection criteria include reference accuracy grade (B), cathode current range (100 μA–70 mA), dynamic impedance (0.25 Ω typical), thermal stability over industrial/automotive temperature ranges, and compatibility with optocoupler-based secondary-side regulation circuits.
Technical Context
The TLVH431BIDBZTG4 implements a bandgap-referenced error amplifier with internal 1.24 V reference and Darlington output stage, enabling precise shunt regulation from 1.24 V to 18 V using two external resistors. Its open-loop configuration supports comparator operation with integrated reference, while closed-loop use delivers stable voltage regulation without mandatory output capacitance.
It operates with ultra-low minimum cathode current (100 μA) - significantly lower than TL431 - and maintains 0.25 Ω typical dynamic impedance across 0.1 mA–70 mA cathode current. The device is specified for –40°C to +125°C (Q-grade), with reference voltage deviation ≤31 mV over full temperature range and <0.5 μA reference terminal current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF @ 25°C | 1.24 V ±0.5% - enables accurate low-voltage adjustment down to 1.24 V, critical for 3.3 V and lower isolated power supplies |
| Cathode Current Range | 100 μA to 70 mA - supports regulation in ultra-low-power monitoring and higher-current shunt applications |
| Dynamic Impedance | 0.25 Ω typical - ensures tight output voltage regulation under load transients and varying cathode current |
| Operating Temperature | –40°C to +125°C - qualified for automotive under-hood and industrial control environments |
| Reference Input Current | 0.1–0.5 μA - minimizes resistor-divider loading error and enables high-impedance feedback networks |
| Output Voltage Range | 1.24 V to 18 V - set externally via two resistors, supporting wide-range programmability without external references |
| Thermal Drift (ΔVREF) | ≤31 mV over full temperature range - translates to <26 ppm/°C average TC, ensuring stability in thermally varying systems |
Pinout & Package
SOT-23-3 package (DBZ variant), 2.92 mm × 1.30 mm body size, with gull-wing leads and standard JEDEC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CATHODE | Shunt current input / output node | Primary current path; sinks regulated current when REF voltage exceeds 1.24 V; connects to optocoupler LED anode in SMPS feedback |
| 2 - REF | Reference input / threshold sense node | High-impedance input (0.1–0.5 μA) that compares against internal 1.24 V reference; tied to resistor divider midpoint in regulation circuits |
| 3 - ANODE | Common return / ground reference | Low-impedance common terminal; must be connected to system ground or return path; defines voltage reference point for cathode and REF pins |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Starts regulation at 1.24 V - enables use in 1.8 V, 2.5 V, and 3.3 V systems where legacy TL431 (2.5 V) cannot function |
| B-grade precision | ±0.5% VREF tolerance at 25°C - reduces calibration overhead and improves absolute output accuracy in closed-loop SMPS designs |
| Ultra-low IK(min) | 100 μA minimum cathode current - allows stable regulation in standby or light-load conditions where current is constrained |
| Integrated comparator mode | Open-loop gain sufficient for rail-to-rail voltage monitoring - eliminates need for separate reference + comparator IC in power-rail supervisors |
| No external capacitor required | Internally compensated - simplifies layout and avoids instability risks from output capacitance in shunt regulator configurations |
Applications
| Adjustable Voltage Reference for Data Converters | Secondary-Side Regulation in Flyback SMPS |
|---|---|
Use Scenario: Providing stable, low-drift reference voltage for SAR or delta-sigma ADCs in battery-powered instrumentation. IC Role / Device Role / Timing Role: Precision shunt reference sourcing <0.5 μA into ADC reference input, maintaining 1.24 V base with resistor scaling. Use Value: Enables 16-bit+ effective resolution by limiting reference drift to ≤31 mV over –40°C to +125°C, reducing system calibration frequency. |
Use Scenario: Regulating 3.3 V output in isolated AC/DC flyback converter using optocoupler feedback to primary-side controller. IC Role / Device Role / Timing Role: Error amplifier and voltage reference in secondary-side feedback loop; compares scaled output against 1.24 V and drives optocoupler LED. Use Value: Achieves ±1% output regulation with 100 μA minimum cathode current, supporting ultra-low standby power without compromising transient response. |
| Zener Diode Replacement | Voltage Monitoring for Power Rails |
Use Scenario: Replacing 2.4 V or 3.3 V Zener diodes in on-board LDO biasing or level-shifting circuits. IC Role / Device Role / Timing Role: Adjustable shunt regulator with sharp knee and <0.1 μA off-state cathode current (IKoff). Use Value: Reduces leakage by >90% vs. typical Zeners, eliminating quiescent current errors in high-impedance bias networks. |
Use Scenario: Monitoring 5 V or 12 V rails in automotive ECUs for undervoltage lockout (UVLO) or fault reporting. IC Role / Device Role / Timing Role: Comparator with built-in 1.24 V reference; REF pin biased via resistor divider to detect threshold crossing. Use Value: Eliminates external reference IC, reducing BOM count and PCB area while maintaining ±0.5% trip-point 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 |
|---|---|---|---|
| TLVH431BIDBVTG4 | SOT-23-5 package (5-pin), includes NC and substrate pins; same electrical specs and B-grade tolerance | Requires different PCB footprint and layout; substrate pin must connect to ANODE or float | Select when board space allows larger SOT-23-5 and thermal performance requires substrate connection |
| TLVH432BIDBZTG4 | Identical electrical specs but reversed pinout: Pin 1 = REF, Pin 2 = CATHODE, Pin 3 = ANODE | Not pin-compatible; requires PCB redesign; used where alternate routing simplifies optocoupler placement | Choose only if schematic/layout revision accommodates inverted pin mapping; no functional advantage over TLVH431BIDBZTG4 |
Compared with TLVH431BIDBZTG4, TLVH431BIDBVTG4 offers identical regulation performance in a larger 5-pin package with thermal substrate access, while TLVH432BIDBZTG4 provides identical specs in a non-pin-compatible 3-pin variant - both require layout changes and offer no accuracy or efficiency benefit over the original SOT-23-3 TLVH431BIDBZTG4.
Availability
TLVH431BIDBZTG4 is available at Aetrix Electronics and suitable for isolated flyback SMPS design, precision data converter reference, and automotive power-rail monitoring requiring stable component supply across extended temperature ranges.
Supply support for TLVH431BIDBZTG4 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 designed specifically for low-voltage, high-accuracy shunt regulation in isolated power supplies and precision analog systems - targeting applications where TL431's 2.5 V reference and 1 mA minimum cathode current are limiting.
FAQ
What is the reference voltage tolerance of TLVH431BIDBZTG4 at 25°C?
The TLVH431BIDBZTG4 has a reference voltage tolerance of ±0.5% at 25°C, corresponding to a 1.24 V nominal VREF with min/max values of 1.234 V and 1.246 V. This B-grade precision is confirmed in Section 5.7 of the official TI datasheet SLVS555N and applies specifically to the TLVH431BIDBZTG4 variant in SOT-23-3 packaging.
Can TLVH431BIDBZTG4 operate in a 1.8 V system?
Yes, TLVH431BIDBZTG4 can regulate starting from 1.24 V, making it fully compatible with 1.8 V systems. When configured as a shunt regulator, its minimum cathode-to-anode voltage is 1.24 V, and it sustains regulation with as little as 100 μA cathode current - well within typical 1.8 V rail current budgets. No additional level-shifting is required.
What is the maximum cathode voltage rating for TLVH431BIDBZTG4?
The absolute maximum cathode voltage (VKA) for TLVH431BIDBZTG4 is 20 V, as specified in Section 5.1 of the TI datasheet. For continuous operation, the recommended maximum cathode voltage is 18 V per Section 5.3 - exceeding this may compromise long-term reliability or thermal performance in the SOT-23-3 package.
Does TLVH431BIDBZTG4 require an output capacitor for stability?
No, TLVH431BIDBZTG4 is internally compensated and does not require an output capacitor between CATHODE and ANODE for basic shunt regulation stability. However, if capacitive loading is introduced (e.g., optocoupler CTR variation or long traces), Figures 5-15 to 5-17 in the datasheet provide phase-margin guidance for selecting appropriate compensation capacitance.
How does TLVH431BIDBZTG4 differ from TLVH432BIDBZTG4?
TLVH431BIDBZTG4 and TLVH432BIDBZTG4 share identical electrical specifications and B-grade tolerance, but TLVH432BIDBZTG4 uses a reversed pinout in the same SOT-23-3 package: Pin 1 = REF, Pin 2 = CATHODE, Pin 3 = ANODE. This makes them electrically equivalent but not pin-compatible - direct substitution requires PCB layout modification.
TLVH431BIDBZTG4 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:
- ±0.5%
- 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-23-3
TLVH431BIDBZTG4 FAQ
1.How can I place an order for TLVH431BIDBZTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH431BIDBZTG4 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 TLVH431BIDBZTG4 reliable?
The price and inventory of TLVH431BIDBZTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431BIDBZTG4 is usually 5 days.
3.What payment methods are accepted for TLVH431BIDBZTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH431BIDBZTG4 transactions.
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4.How is shipping managed for TLVH431BIDBZTG4?
TLVH431BIDBZTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH431BIDBZTG4 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 TLVH431BIDBZTG4?
For technical support, including TLVH431BIDBZTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431BIDBZTG4 requirements.
6.How does Aetrix verify that TLVH431BIDBZTG4 is sourced from the original manufacturer or authorized distributors?
All TLVH431BIDBZTG4 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 TLVH431BIDBZTG4 meets industry standards.
7.What is the process for return or replacement of TLVH431BIDBZTG4?
All TLVH431BIDBZTG4 units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431BIDBZTG4, 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 TLVH431BIDBZTG4 part is unused and in its original packaging.
Return procedure for TLVH431BIDBZTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH431BIDBZTG4 Tags
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TL431AIDBZR
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