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Texas Instruments TLVH431BIDBZR
- Part No.:
- TLVH431BIDBZR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TLVH431BIDBZR.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,039
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Product details
Overview
TLVH431BIDBZR from Texas Instruments is a precision 3-terminal adjustable shunt voltage reference with 0.5% initial tolerance at 25°C, 1.24V nominal reference voltage, and operation down to 1.24V cathode-anode voltage. It delivers stable regulation across –40°C to +125°C, supports 100μA–70mA cathode current, and features 0.25Ω typical dynamic impedance-enabling use in low-voltage flyback SMPS secondary-side feedback loops.
For engineers reviewing the TLVH431BIDBZR datasheet, TLVH431BIDBZR pinout, TLVH431BIDBZR application, or TLVH431BIDBZR equivalent, key selection criteria include reference accuracy grade (B), SOT-23-3 package footprint, cathode current headroom for optocoupler drive, thermal stability over industrial/automotive temperature ranges, and compatibility with resistor-based output voltage programming from 1.24V to 18V.
Technical Context
The TLVH431BIDBZR implements an internal bandgap reference and high-gain NPN-based error amplifier driving a Darlington sink output stage. Its open-loop comparator mode enables precise voltage monitoring without external references, while closed-loop configuration with resistive feedback achieves stable shunt regulation via cathode-current-controlled conduction.
Unlike the TL431, it operates with ≥1.24V headroom and as low as 100μA cathode current, making it suitable for 3.3V and lower isolated power supplies. The device is internally compensated and stable without output capacitance, though phase margin vs. capacitive load is characterized up to 100nF for design validation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage (VREF) | 1.24 V ±0.5% at 25°C - sets minimum programmable output voltage and defines accuracy baseline for resistor-divider designs |
| Reference Tolerance Grade | B grade - guarantees ≤0.5% initial error at 25°C, critical for high-accuracy data converter references and precision monitoring |
| Operating Temperature Range | –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 - supports low-power optocoupler biasing in flyback controllers and high-current shunt regulation |
| Dynamic Impedance | 0.25 Ω typical - ensures tight output voltage regulation under varying load conditions in feedback loops |
| Minimum Cathode Current (IK(min)) | 100 μA - defines lowest usable current for stable regulation; impacts startup behavior and light-load efficiency |
| Output Voltage Range | 1.24 V to 18 V - achieved using two external resistors; enables flexible rail monitoring and adjustable supply design |
Pinout & Package
SOT-23-3 package (DBZ): 2.92 mm × 1.30 mm body, 0.95 mm max height, gull-wing leads, JEDEC MO-178AC compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: CATHODE | Current sink output terminal | Connects to regulated rail or optocoupler LED anode; carries full shunt current; voltage referenced to ANODE |
| 2: REF | Reference input sensing node | Compares external voltage to internal 1.24V reference; requires ≥0.1 μA input current; must not be left floating |
| 3: ANODE | Common return / ground reference | Typically connected to system ground or power return path; serves as voltage reference point for both REF and CATHODE |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Starts regulating at 1.24V cathode-anode differential - enables use in 1.8V, 2.5V, and 3.3V systems where TL431 cannot function |
| Ultra-low reference current | 0.1–0.5 μA at REF pin - minimizes loading on high-impedance resistor dividers and preserves accuracy in battery-powered sensors |
| Sharp turn-on characteristic | High open-loop gain with Darlington output - provides fast, clean switching in comparator mode for voltage threshold detection |
| Zener diode replacement | 100 μA minimum cathode current vs. typical Zener leakage >10 μA - reduces standby power and improves regulation at light loads |
| Thermal stability | ≤31 mV VREF deviation over –40°C to +125°C (Q-grade) - maintains accuracy across automotive and industrial ambient extremes |
Applications
| Adjustable Voltage Reference for Data Converters | Secondary-Side Regulation in Flyback SMPS |
|---|---|
Use Scenario: Precision ADC/DAC reference in portable instrumentation or sensor signal chains operating from 3.3V rails. IC Role / Device Role / Timing Role: Provides stable, low-drift 1.24V reference that sets full-scale conversion range; replaces discrete Zener + op-amp solutions. Use Value: 0.5% initial tolerance and <31 mV tempco ensure <0.1% total reference error over temperature-critical for 12-bit+ resolution systems. |
Use Scenario: Isolated feedback element in 3.3V-output flyback converters using optocouplers for primary-side controller communication. IC Role / Device Role / Timing Role: Acts as error amplifier and voltage reference in secondary-side regulation loop; sinks optocoupler LED current proportional to output deviation. Use Value: 100 μA minimum cathode current allows reliable optocoupler turn-on even at light loads, improving no-load regulation and efficiency. |
| Zener Diode Replacement with Low Leakage | Voltage Monitoring for Power Rails |
Use Scenario: On-board 1.2V–5V rail stabilization in FPGA or microcontroller power domains where Zener leakage degrades standby current. IC Role / Device Role / Timing Role: Functions as active shunt regulator; clamps excess voltage by sinking current when rail exceeds programmed threshold. Use Value: Off-state cathode current ≤0.1 μA at 18V - reduces quiescent power by >90% versus standard 1N47xx Zeners (typically 5–50 μA leakage). |
Use Scenario: Real-time monitoring of 1.8V I/O supply or 12V auxiliary rail in industrial PLC modules with fault reporting via microcontroller GPIO. IC Role / Device Role / Timing Role: Configured as comparator with REF tied to monitored rail; CATHODE pulled high to generate digital alert when voltage exceeds threshold. Use Value: Integrated 1.24V reference eliminates external reference IC, reducing BOM count and PCB area while maintaining ±1% trip-point accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431BIDBVT | SOT-23-5 package with NC and substrate pins; same electrical specs and B-grade tolerance | Requires different PCB layout; substrate pin must connect to ANODE or float; used where ESD robustness or thermal relief needed | Select when board layout allows 5-pin footprint and substrate connection is feasible; avoid if space-constrained or 3-pin simplicity required |
| TLVH432BIDBZR | Identical electrical performance but reversed pinout: REF–CATHODE–ANODE vs. CATHODE–REF–ANODE in TLVH431BIDBZR | Not pin-compatible; requires PCB redesign; used where alternate routing or legacy TLVH432-based designs exist | Choose only when migrating from TLVH432 or when pinout reversal simplifies trace routing; verify schematic symbol matches DBZ pin assignment |
Compared with TLVH431BIDBZR, TLVH431BIDBVT offers enhanced thermal dissipation and ESD margin in a larger package, while TLVH432BIDBZR provides identical functionality with inverted pin order-neither is drop-in replaceable, but both serve identical voltage reference and regulation roles in appropriately adapted designs.
Availability
TLVH431BIDBZR is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and precision analog measurement systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TLVH431BIDBZR 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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, longevity, and application-specific optimization.
The TLVH431 family was designed specifically for low-voltage, high-accuracy shunt regulation in isolated power supplies, data acquisition systems, and voltage supervision circuits-addressing limitations of legacy TL431 in sub-2.5V applications.
FAQ
What is the reference voltage tolerance of TLVH431BIDBZR at 25°C?
The TLVH431BIDBZR has a reference voltage tolerance of ±0.5% at 25°C, corresponding to a 1.24V nominal VREF with a range of 1.234V to 1.246V. This B-grade specification is confirmed in Section 5.7 of the TI datasheet and applies strictly to the TLVH431BIDBZR variant. The tolerance remains stable across its full operating temperature range, with maximum deviation of 31 mV from –40°C to +125°C.
Can TLVH431BIDBZR operate with cathode-to-anode voltage below 2.5V?
Yes, TLVH431BIDBZR is explicitly designed for low-voltage operation starting at 1.24V cathode-to-anode voltage-unlike the TL431 which requires ≥2.5V. This enables direct use in 1.8V, 2.5V, and 3.3V systems. The device regulates stably down to its reference voltage, provided minimum cathode current (100 μA) is maintained and thermal limits are observed.
What is the function of the REF pin on TLVH431BIDBZR?
The REF pin on TLVH431BIDBZR is the high-impedance input that senses external voltage and compares it to the internal 1.24V bandgap reference. It draws only 0.1–0.5 μA and must never be left floating; it connects to a resistor divider network to program output voltage or to a monitored rail for threshold detection. Its low input current preserves accuracy in high-resistance feedback networks.
Is TLVH431BIDBZR pin-compatible with TLVH432BIDBZR?
No, TLVH431BIDBZR is not pin-compatible with TLVH432BIDBZR. While both share identical electrical characteristics and SOT-23-3 (DBZ) packaging, their pinouts differ: TLVH431BIDBZR uses CATHODE–REF–ANODE (Pin 1–2–3), whereas TLVH432BIDBZR uses REF–CATHODE–ANODE (Pin 1–2–3). Swapping them without PCB revision will cause functional failure.
How does TLVH431BIDBZR achieve stability without an output capacitor?
TLVH431BIDBZR incorporates internal compensation that ensures stability in shunt regulator configurations without requiring an external cathode-to-anode capacitor. This is validated across its full cathode current range (100 μA–70 mA). However, if an output capacitor is added, Figures 5-15–5-17 in the datasheet provide phase margin vs. capacitive load guidance to prevent oscillation at specific values.
TLVH431BIDBZR 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:
- ±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
TLVH431BIDBZR FAQ
1.How can I place an order for TLVH431BIDBZR through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH431BIDBZR 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 TLVH431BIDBZR reliable?
The price and inventory of TLVH431BIDBZR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431BIDBZR is usually 5 days.
3.What payment methods are accepted for TLVH431BIDBZR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH431BIDBZR transactions.
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4.How is shipping managed for TLVH431BIDBZR?
TLVH431BIDBZR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH431BIDBZR 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 TLVH431BIDBZR?
For technical support, including TLVH431BIDBZR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431BIDBZR requirements.
6.How does Aetrix verify that TLVH431BIDBZR is sourced from the original manufacturer or authorized distributors?
All TLVH431BIDBZR 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 TLVH431BIDBZR meets industry standards.
7.What is the process for return or replacement of TLVH431BIDBZR?
All TLVH431BIDBZR units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431BIDBZR, 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 TLVH431BIDBZR part is unused and in its original packaging.
Return procedure for TLVH431BIDBZR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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