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Texas Instruments TLVH431BCDBZR
- Part No.:
- TLVH431BCDBZR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TLVH431BCDBZR.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,286
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Product details
Overview
TLVH431BCDBZR from Texas Instruments is a low-voltage adjustable precision shunt regulator with 0.5% 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 TLVH431BCDBZR datasheet, TLVH431BCDBZR pinout, TLVH431BCDBZR application, or TLVH431BCDBZR equivalent, key selection considerations include its B-grade accuracy, SOT-23-3 (DBZ) package pin compatibility with TLVH432 variants, ultra-low minimum cathode current requirement, and suitability for secondary-side regulation in 3.3 V and lower isolated power supplies.
Technical Context
The TLVH431BCDBZR implements a bandgap-referenced error amplifier with internal 1.24 V reference and Darlington output stage, operating in either open-loop comparator mode or closed-loop shunt regulation mode. Its functional block includes a high-gain transconductance amplifier driving a sink-output transistor, with reference input requiring ≥0.1 μA bias current and cathode current ≥100 μA to maintain regulation.
Unlike the TL431, it achieves regulation at voltages as low as 1.24 V and exhibits sharp turn-on characteristics due to active output circuitry. It is internally compensated for stability without an external cathode-to-anode capacitor, though phase margin vs. capacitive load is characterized up to 100 nF for design guidance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage (VREF) | 1.24 V ±0.5% at 25°C - enables precise low-voltage threshold setting and feedback sensing in sub-3.3 V systems |
| Operating Cathode Voltage Range | 1.24 V to 18 V - supports direct regulation of 1.8 V, 2.5 V, 3.3 V, and 5 V rails without external level-shifting |
| Cathode Current Range | 100 μA to 70 mA - allows operation in ultra-low-power monitoring circuits and higher-current shunt regulation |
| Dynamic Impedance | 0.25 Ω typical - ensures tight output voltage regulation under varying load conditions in feedback networks |
| Temperature Range | –40°C to +125°C - qualified for automotive and industrial environments where thermal stability is critical |
| Reference Input Current (IREF) | 0.1–0.5 μA - minimizes resistor-divider loading error in high-impedance voltage-sense networks |
| Output Noise (0.1–10 Hz) | 10 µVPP - supports precision analog monitoring and low-noise reference applications |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92 mm × 1.30 mm body, 0.95 mm max height, gull-wing leads, RoHS-compliant, moisture sensitivity level 1.
| 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 isolated SMPS |
| 2 - REF | Reference input terminal | Senses external voltage divider; must be biased with ≥0.1 μA; determines regulation point via R1/R2 ratio: VOUT = VREF(1 + R1/R2) + IREFR1 |
| 3 - ANODE | Common return / ground reference | Low-impedance return path for cathode and reference currents; typically connected to system ground or power rail common |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Regulates down to 1.24 V cathode-to-anode - enables use in modern low-voltage microcontroller and FPGA power domains |
| B-grade accuracy | ±0.5% VREF tolerance at 25°C - reduces calibration overhead in precision voltage monitoring and data converter references |
| Ultra-low IK(min) | 100 μA minimum cathode current - permits operation with high-value feedback resistors, lowering quiescent power in battery-powered systems |
| Integrated comparator function | Open-loop gain >60 dB - allows direct use as a rail-to-rail voltage monitor without external op-amp or reference |
| Stable without output capacitor | Internally compensated - eliminates need for cathode-to-anode bypass capacitor in most designs, simplifying layout and reducing BOM count |
Applications
| Adjustable Voltage Reference for Data Converters | Secondary-Side Regulation in Flyback SMPS |
|---|---|
Use Scenario: Providing stable, low-drift reference voltage to SAR or delta-sigma ADCs in portable instrumentation. IC Role / Device Role / Timing Role: Precision shunt reference supplying VREF input; replaces discrete Zener + op-amp solutions. Use Value: 0.5% initial tolerance and <31 mV full-range drift ensure ≤12-bit effective resolution without trimming. |
Use Scenario: Closed-loop voltage sensing on secondary side of isolated 3.3 V flyback converter using optocoupler feedback. IC Role / Device Role / Timing Role: Error amplifier + reference in isolated feedback path; regulates output by modulating optocoupler LED current. Use Value: 1.24 V reference enables regulation as low as ~2.7 V output; 100 μA IK(min) allows high-resistance feedback network for low standby loss. |
| Zener Diode Replacement | Voltage Monitoring for Power Rails |
Use Scenario: Replacing 2.4 V or 3.3 V Zener diodes in on-board LDO pre-regulation or bias networks. IC Role / Device Role / Timing Role: Adjustable shunt regulator with sharp knee and low leakage (<0.1 μA off-state). Use Value: 0.25 Ω dynamic impedance yields <1 mV load regulation error vs. >10 Ω for typical Zeners; improves system accuracy and thermal stability. |
Use Scenario: Monitoring 1.8 V core rail in SoC-based embedded systems for brownout detection. IC Role / Device Role / Timing Role: Open-loop comparator with integrated 1.24 V reference; triggers reset when rail drops below threshold. Use Value: Eliminates external reference IC and comparator; 0.1 μA IREF enables high-impedance sense network, minimizing rail loading. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431ACDBZR | 1% VREF tolerance at 25°C (vs. 0.5% for TLVH431BCDBZR); otherwise identical electrical specs and pinout | Suitable where ±1% reference accuracy meets system requirements, e.g., non-precision power sequencing | Select TLVH431ACDBZR for cost-sensitive designs where tighter tolerance is not required. |
| TLVH432BCDBZR | Same B-grade accuracy and electrical performance, but pinout differs: REF and ANODE swapped in SOT-23-3 package (REF=Pin1, ANODE=Pin3) | Requires PCB layout revision; used where alternate pinout simplifies routing in dense optocoupler interfaces | Choose TLVH432BCDBZR only if board layout benefits from reversed REF/ANODE placement; not drop-in compatible. |
Compared with TLVH431ACDBZR, TLVH431BCDBZR provides 2× tighter reference tolerance for precision feedback, while TLVH432BCDBZR offers identical accuracy but demands trace rework due to non-matching pin assignment - making TLVH431BCDBZR the optimal choice for new designs prioritizing accuracy and layout continuity.
Availability
TLVH431BCDBZR is available at Aetrix Electronics and suitable for isolated power supply design, precision analog monitoring, and low-voltage rail supervision requiring stable component supply and long-term manufacturability.
Supply support for TLVH431BCDBZR 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 delivering analog and embedded processing solutions, with leadership in precision analog, power management, and signal chain technologies.
The TLVH431 family was designed for low-voltage, high-accuracy shunt regulation in space-constrained and thermally demanding applications - especially isolated DC/DC converters, data acquisition references, and intelligent power monitoring systems.
FAQ
What is the reference voltage tolerance of TLVH431BCDBZR at 25°C?
The TLVH431BCDBZR has a reference voltage tolerance of ±0.5% at 25°C, corresponding to a 1.24 V nominal VREF with a range of 1.234 V to 1.246 V. This B-grade accuracy is specified in Section 5.7 of the TI datasheet and applies across all temperature grades (C/I/Q) of the TLVH431BCDBZR part number.
Can TLVH431BCDBZR replace a standard Zener diode in low-power applications?
Yes, TLVH431BCDBZR can directly replace low-voltage Zener diodes (e.g., 2.4 V, 3.3 V) with superior performance: it offers sharp turn-on, 0.25 Ω dynamic impedance (vs. >10 Ω for Zeners), <0.1 μA off-state current, and adjustable output from 1.24 V to 18 V using two external resistors - all in the same SOT-23-3 footprint as TLVH431BCDBZR.
What is the minimum cathode current required for regulation in TLVH431BCDBZR?
The TLVH431BCDBZR 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 holds across the full operating temperature range (–40°C to +125°C) and enables reliable operation in ultra-low-power monitoring circuits where high-value feedback resistors are used.
Is TLVH431BCDBZR pin-compatible with TLVH432BCDBZR?
No, TLVH431BCDBZR is not pin-compatible with TLVH432BCDBZR. Although both use the SOT-23-3 (DBZ) package, their pinouts differ: TLVH431BCDBZR uses Pin1=CATHODE, Pin2=REF, Pin3=ANODE, while TLVH432BCDBZR uses Pin1=REF, Pin2=CATHODE, Pin3=ANODE. Interchanging them without PCB modification will cause functional failure.
Does TLVH431BCDBZR require an external output capacitor for stability?
No, TLVH431BCDBZR is internally compensated and stable without an external cathode-to-anode capacitor. However, if a capacitor is added for noise filtering or transient response shaping, Figures 5-15 through 5-17 in the datasheet provide phase margin vs. capacitive load data (up to 100 nF) to guide selection and avoid instability in TLVH431BCDBZR-based designs.
TLVH431BCDBZR 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
TLVH431BCDBZR FAQ
1.How can I place an order for TLVH431BCDBZR through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH431BCDBZR 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 TLVH431BCDBZR reliable?
The price and inventory of TLVH431BCDBZR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431BCDBZR is usually 5 days.
3.What payment methods are accepted for TLVH431BCDBZR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH431BCDBZR transactions.
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4.How is shipping managed for TLVH431BCDBZR?
TLVH431BCDBZR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH431BCDBZR 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 TLVH431BCDBZR?
For technical support, including TLVH431BCDBZR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431BCDBZR requirements.
6.How does Aetrix verify that TLVH431BCDBZR is sourced from the original manufacturer or authorized distributors?
All TLVH431BCDBZR 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 TLVH431BCDBZR meets industry standards.
7.What is the process for return or replacement of TLVH431BCDBZR?
All TLVH431BCDBZR units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431BCDBZR, 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 TLVH431BCDBZR part is unused and in its original packaging.
Return procedure for TLVH431BCDBZR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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