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Texas Instruments TLVH431BCDBVTE4
- Part No.:
- TLVH431BCDBVTE4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TLVH431BCDBVTE4.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,919
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Product details
Overview
TLVH431BCDBVTE4 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 accurate secondary-side feedback in isolated 3.3 V flyback SMPS designs.
For engineers reviewing the TLVH431BCDBVTE4 datasheet, TLVH431BCDBVTE4 pinout, TLVH431BCDBVTE4 application, or TLVH431BCDBVTE4 equivalent, key selection criteria include initial VREF tolerance (B-grade), thermal stability over industrial/automotive temperature ranges, ultra-low minimum cathode current requirement, and compatibility with optocoupler-based isolated feedback topologies.
Technical Context
The TLVH431BCDBVTE4 implements a precision bandgap reference and high-gain transconductance amplifier in a 3-terminal shunt configuration. Its internal architecture forces the REF pin to 1.24 V when sufficient cathode current (≥100 μA) is supplied, enabling closed-loop regulation via external resistor dividers or open-loop comparator operation with integrated reference.
It operates without external compensation due to internal frequency compensation, supports stable operation with capacitive loads up to 10 nF (depending on cathode voltage), and exhibits sharp turn-on characteristics - making it a direct functional replacement for low-voltage Zener diodes while offering superior accuracy, temperature drift, and leakage performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF tolerance (25°C) | ±0.5% - ensures tight output voltage setting accuracy in adjustable regulator circuits |
| Reference voltage | 1.24 V nominal - enables regulation down to sub-1.8 V rails, unlike TL431 (2.5 V) |
| Operating temperature | –40°C to +125°C - qualified for automotive and industrial environments |
| Cathode current range | 100 μA to 70 mA - supports ultra-low-power monitoring and high-current shunt regulation |
| Dynamic impedance | 0.25 Ω typical - minimizes output voltage variation under load transients |
| Minimum cathode current | 100 μA max - allows operation in energy-constrained systems where supply current is limited |
| Output voltage range | VREF to 18 V - set by two external resistors; supports wide-range programmable references |
Pinout & Package
SOT-23-3 (DBV) package: 2.90 mm × 1.60 mm body, 5-pin variant with NC and substrate connection; TLVH431BCDBVTE4 uses the standard 3-pin DBZ pinout mapping despite DBV suffix - confirmed by TI's Pin Functions table showing identical CATHODE/ANODE/REF assignment for DBZ and DBV in 3-pin configurations.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE | Shunt current input / output node | Primary current path; sinks regulated current to maintain REF at 1.24 V; connects to feedback network or optocoupler LED anode |
| ANODE | Common return / ground reference | Must be connected to system ground or lowest potential node; serves as voltage reference point for cathode and REF terminals |
| REF | Feedback input / reference threshold | Senses divided output voltage; device regulates when REF = 1.24 V; requires ≥0.1 μA input bias current |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Regulates from 1.24 V cathode-to-anode - enables use in 1.8 V, 2.5 V, and 3.3 V systems where TL431 cannot function |
| High-accuracy reference | 0.5% initial VREF tolerance (B grade) - reduces calibration overhead in precision power supplies and data converters |
| Ultra-low IK(min) | 100 μA maximum - permits operation in battery-backed monitors and always-on supervision circuits |
| Integrated comparator mode | Open-loop gain >100 dB - allows direct use as voltage monitor without external op-amp or reference |
| Stable without output capacitor | Internally compensated - eliminates need for external stabilization capacitor in most shunt regulator applications |
Applications
| Adjustable Voltage Reference for Data Converters | Secondary-Side Regulation in Flyback SMPS |
|---|---|
Use Scenario: Providing precise, temperature-stable reference voltage to SAR or delta-sigma ADCs in portable instrumentation. IC Role / Device Role / Timing Role: Adjustable shunt reference generating VREF = 1.24 V × (1 + R1/R2) with <0.5% error at 25°C and <31 mV drift over –40°C to +125°C. Use Value: Eliminates need for discrete precision reference ICs or trimming; supports ratiometric measurement accuracy down to 12-bit ENOB. | 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; compares scaled output against 1.24 V and drives optocoupler LED to regulate primary-side controller. Use Value: Enables regulation as low as 2.7 V output (1.24 V + opto VF); achieves ±1% output accuracy over line/load/temperature with no auxiliary winding. |
| Zener Diode Replacement | Voltage Monitoring for Power Rails |
Use Scenario: Replacing 1.2–2.4 V Zener diodes in on-board LDO supervision or bias networks. IC Role / Device Role / Timing Role: Precision shunt regulator with 0.25 Ω dynamic impedance and 0.1 μA REF leakage - orders-of-magnitude lower than Zener leakage. Use Value: Reduces standby current by >95% vs. Zener solutions; improves long-term stability and temperature coefficient (±31 mV over full range). | Use Scenario: Monitoring 1.8 V, 2.5 V, or 3.3 V rail integrity in FPGA or microcontroller power domains. IC Role / Device Role / Timing Role: Comparator with integrated 1.24 V reference; triggers reset or alert when rail drops below threshold set by resistor divider. Use Value: Single-component solution replaces reference + comparator; supports fast response (<1 μs) and consumes <100 μA quiescent current. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431ACDBVT | 1% VREF tolerance at 25°C; otherwise identical electrical specs and pinout | Suitable where ±1% output accuracy suffices and cost sensitivity outweighs precision requirements | Select TLVH431ACDBVT for cost-optimized industrial power supplies where tighter tolerance is unnecessary |
| TLVH432BCDBVT | Same B-grade tolerance and specs, but SOT-23-3 pinout swaps REF and ANODE positions (pin 1=REF, pin 2=ANODE, pin 3=CATHODE) | Requires PCB layout revision; used when alternate pinout simplifies routing in dense layouts or matches legacy footprints | Choose TLVH432BCDBVT only if board redesign is acceptable and pinout alignment improves signal integrity or thermal management |
Compared with TLVH431ACDBVT, TLVH431BCDBVTE4 provides twice the initial reference accuracy at minimal cost premium; compared with TLVH432BCDBVT, it retains standard DBZ pinout compatibility - avoiding layout changes while delivering identical regulation performance.
Availability
TLVH431BCDBVTE4 is available at Aetrix Electronics and suitable for isolated flyback SMPS designs, precision data converter references, and low-power voltage monitoring applications requiring stable component supply across automotive, industrial, and telecom end equipment.
Supply support for TLVH431BCDBVTE4 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 technologies with over 50 years of innovation in precision analog ICs.
The TLVH431 family was designed specifically for low-voltage, high-accuracy shunt regulation in space-constrained and thermally demanding applications - targeting secondary-side feedback in isolated DC/DC converters and precision reference needs in data acquisition systems.
FAQ
What is the reference voltage tolerance of TLVH431BCDBVTE4 at 25°C?
The TLVH431BCDBVTE4 has a reference voltage tolerance of ±0.5% at 25°C, corresponding to a VREF range of 1.234 V to 1.246 V. This B-grade specification is explicitly defined in Section 5.7 of the TI datasheet SLVS555N and applies across all temperature grades (C/I/Q) of the TLVH431B variant. The tolerance remains stable over time and operating life, with <0.1% drift after 10,000 hours at 55°C.
Can TLVH431BCDBVTE4 operate with cathode voltage below 2.5 V?
Yes, TLVH431BCDBVTE4 is specifically 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. It maintains regulation down to this limit across its full –40°C to +125°C temperature range, enabling use in 1.8 V and 2.5 V systems where traditional shunt references fail to start or regulate accurately.
What is the minimum cathode current required for regulation in TLVH431BCDBVTE4?
The maximum minimum cathode current (IK(min)) for TLVH431BCDBVTE4 is 100 μA, specified over the full operating temperature range. This value is guaranteed in Section 5.5 of the datasheet and enables reliable regulation in ultra-low-power applications such as battery-backed supervisors or energy-harvesting systems where supply current is severely constrained.
Does TLVH431BCDBVTE4 require an external output capacitor for stability?
No, TLVH431BCDBVTE4 is internally compensated and stable without an external output capacitor between cathode and anode. TI's datasheet confirms unconditional stability in standard shunt regulator configurations. However, if a capacitor is added for noise filtering or transient response shaping, Figures 5-15 through 5-17 provide phase margin guidance for selecting values up to 10 nF depending on cathode voltage and load conditions.
How does the pinout of TLVH431BCDBVTE4 compare to TLVH432 variants?
TLVH431BCDBVTE4 uses the standard TLVH431 DBZ pinout: Pin 1 = CATHODE, Pin 2 = ANODE, Pin 3 = REF. Although its part number suffix indicates DBV (5-pin SOT-23), TI's official Pin Functions table confirms that TLVH431BCDBVTE4 is packaged in the 3-pin SOT-23-3 (DBZ) variant and maps identically to TLVH431BDBZ - not the swapped REF/ANODE arrangement of TLVH432.
TLVH431BCDBVTE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- SC-74A, SOT-753
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
TLVH431BCDBVTE4 FAQ
1.How can I place an order for TLVH431BCDBVTE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH431BCDBVTE4 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 TLVH431BCDBVTE4 reliable?
The price and inventory of TLVH431BCDBVTE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431BCDBVTE4 is usually 5 days.
3.What payment methods are accepted for TLVH431BCDBVTE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH431BCDBVTE4 transactions.
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4.How is shipping managed for TLVH431BCDBVTE4?
TLVH431BCDBVTE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH431BCDBVTE4 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 TLVH431BCDBVTE4?
For technical support, including TLVH431BCDBVTE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431BCDBVTE4 requirements.
6.How does Aetrix verify that TLVH431BCDBVTE4 is sourced from the original manufacturer or authorized distributors?
All TLVH431BCDBVTE4 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 TLVH431BCDBVTE4 meets industry standards.
7.What is the process for return or replacement of TLVH431BCDBVTE4?
All TLVH431BCDBVTE4 units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431BCDBVTE4, 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 TLVH431BCDBVTE4 part is unused and in its original packaging.
Return procedure for TLVH431BCDBVTE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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