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Texas Instruments TLVH431AIDBVT
- Part No.:
- TLVH431AIDBVT
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TLVH431AIDBVT.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,240
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Product details
Overview
TLVH431AIDBVT from Texas Instruments is a low-voltage adjustable precision shunt regulator with 1% reference voltage tolerance at 25°C, 1.24 V nominal reference voltage, 100 μA minimum cathode current for regulation, 0.25 Ω typical dynamic impedance, and operation across –40°C to +125°C. It serves as an error amplifier or voltage reference in isolated flyback SMPS feedback loops.
For engineers reviewing the TLVH431AIDBVT datasheet, TLVH431AIDBVT pinout, TLVH431AIDBVT application, or TLVH431AIDBVT equivalent, key selection criteria include reference accuracy grade (A = 1%), SOT-23-3 package compatibility, cathode current range (100 μA–70 mA), and thermal stability over industrial/automotive temperature ranges.
Technical Context
The TLVH431AIDBVT implements a precision bandgap reference and high-gain transconductance amplifier in a 3-terminal shunt topology. Its internal Darlington output stage enables sharp turn-on behavior and stable regulation down to 1.24 V with no external compensation required.
It operates in two functional modes: open-loop comparator mode (using integrated 1.24 V reference) and closed-loop shunt regulator mode (with resistive feedback from cathode to reference pin). Cathode-to-anode voltage range spans 1.24 V to 18 V, supporting secondary-side regulation in 3.3 V and 5 V isolated power supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V ±1% at 25°C - sets precise regulation threshold for feedback networks |
| Min Cathode Current | 100 μA - minimum current needed to maintain regulation; enables ultra-low-power biasing |
| Dynamic Impedance | 0.25 Ω typical - ensures tight output voltage stability under load transients |
| Operating Temp Range | –40°C to +125°C - qualified for automotive under-hood and industrial control environments |
| Cathode Voltage Range | 1.24 V to 18 V - supports wide-output adjustable regulation without external components |
| Reference Input Current | 0.1–0.5 μA - ultra-low input bias enables high-resistance feedback dividers |
| Output Leakage | 0.02–0.1 μA off-state - minimizes standby power loss in always-on monitoring circuits |
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 sink node | Primary current path; connects to regulated output rail via optocoupler LED or resistor divider |
| 2 - ANODE | Common return / ground reference | Must be connected to system ground or lowest potential point; defines voltage reference baseline |
| 3 - REF | Feedback input / reference sense | Compares external voltage to internal 1.24 V bandgap; requires ≥0.1 μA bias current for proper operation |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Regulates down to 1.24 V cathode-anode voltage - enables use in 1.8 V, 2.5 V, and 3.3 V systems where legacy TL431 fails |
| Ultra-low cathode current | 100 μA minimum regulation current - reduces standby power in battery-backed or energy-harvesting applications |
| Integrated precision reference | 1.24 V ±1% (A-grade) - eliminates need for external voltage reference IC in comparator or error amplifier configurations |
| No external compensation | Internally compensated - stable with or without output capacitor; simplifies layout in space-constrained designs |
| High temperature rating | Specified from –40°C to +125°C - supports automotive AEC-Q100-qualified designs without derating |
Applications
| Adjustable Voltage Reference for Data Converters | Secondary-Side Regulation in Flyback SMPS |
|---|---|
Use Scenario: Provides stable, low-drift reference voltage for SAR and delta-sigma ADCs in portable instrumentation. IC Role / Device Role / Timing Role: Precision shunt reference supplying clean 1.24 V–5 V reference to ADC REF+ pin via buffered divider. Use Value: 1% initial tolerance and 31 mV full-range deviation ensure <0.5 LSB error in 12-bit converters across temperature. | Use Scenario: Regulates isolated 3.3 V output in AC/DC flyback converters using optocoupler feedback. IC Role / Device Role / Timing Role: Error amplifier and voltage reference combined; compares sampled output to internal 1.24 V and drives optocoupler LED. Use Value: Enables regulation as low as 2.7 V output (1.24 V + opto VF) - critical for modern low-voltage rails. |
| Zener Diode Replacement | Voltage Monitoring for Power Rails |
Use Scenario: Replaces discrete 2.5 V or 3.3 V Zener diodes in on-board biasing and clamping circuits. IC Role / Device Role / Timing Role: Adjustable shunt regulator with sharp knee and low leakage (<0.1 μA). Use Value: 0.25 Ω dynamic impedance and 100 μA min current yield tighter regulation than Zeners above 5 mA. | Use Scenario: Monitors 5 V or 12 V supply rails for undervoltage lockout (UVLO) or brownout detection. IC Role / Device Role / Timing Role: Comparator with built-in 1.24 V reference; triggers reset when divided rail voltage drops below threshold. Use Value: Eliminates external reference and comparator IC - reduces BOM count and improves threshold accuracy vs. resistor-divider-only solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431BIDBVT | 0.5% reference tolerance (vs. 1%); otherwise identical electrical specs and pinout | Required where <0.5% initial accuracy is mandated (e.g., metrology-grade references) | Select TLVH431BIDBVT only if tighter reference tolerance justifies cost premium; same PCB layout and thermal design |
| TLV431ACDBVR | Higher 2.5 V reference voltage; 1% tolerance; SOT-23-5 package with NC and substrate pins | Not suitable for sub-2.5 V regulation; requires different feedback network scaling | Choose TLV431ACDBVR only when existing 2.5 V reference architecture must be retained; not drop-in compatible |
Compared with TLVH431BIDBVT, TLVH431AIDBVT trades 0.5% accuracy for lower cost while maintaining identical thermal performance and regulation headroom; versus TLV431ACDBVR, it enables true low-voltage (1.24 V) operation but requires redesign of feedback resistors and layout due to different pin count and reference level.
Availability
TLVH431AIDBVT is available at Aetrix Electronics and suitable for isolated power supplies, precision analog monitoring, and low-voltage reference applications requiring stable component supply across automotive, industrial control, and telecom infrastructure programs.
Supply support for TLVH431AIDBVT 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, embedded processing, and connectivity solutions for industrial, automotive, and consumer markets.
The TLVH431 product line delivers low-voltage, high-accuracy shunt references optimized for secondary-side regulation in compact isolated power supplies and precision voltage monitoring circuits.
FAQ
What is the reference voltage tolerance of TLVH431AIDBVT at 25°C?
The TLVH431AIDBVT has a reference voltage tolerance of ±1% at 25°C, corresponding to a 1.24 V nominal value ranging from 1.228 V to 1.252 V. This A-grade specification is confirmed in Section 5.6 of the TI SLVS555N datasheet and applies specifically to the TLVH431A variant in DBZ (SOT-23-3) packaging. The tolerance remains stable across its full operating temperature range of –40°C to +125°C.
Can TLVH431AIDBVT operate with cathode voltages below 2.5 V?
Yes, TLVH431AIDBVT is explicitly designed for low-voltage operation starting at 1.24 V cathode-to-anode voltage, unlike the TL431 family which requires ≥2.5 V. Its internal bandgap reference and Darlington output stage enable stable regulation down to the 1.24 V threshold, making it suitable for 1.8 V, 2.5 V, and 3.3 V systems. Operation below 1.24 V is not supported and results in loss of regulation.
What is the minimum cathode current required for regulation in TLVH431AIDBVT?
The TLVH431AIDBVT requires a minimum cathode current of 100 μA to maintain regulation, as specified in Section 5.5 of the datasheet under IK(min). This value is valid across the full temperature range (–40°C to +125°C) and is significantly lower than the 1 mA requirement of the TL431, enabling ultra-low-power biasing in battery-operated or energy-harvesting applications.
Does TLVH431AIDBVT require an external output capacitor for stability?
No, TLVH431AIDBVT is internally compensated and remains stable without an external output capacitor between cathode and anode. This is confirmed in Section 7.3 of the datasheet. However, if an output capacitor is used for filtering or transient response improvement, Figures 5-15 through 5-17 provide phase margin guidance for selecting appropriate capacitance values based on cathode voltage and load conditions.
How does the pinout of TLVH431AIDBVT differ from TLVH432 variants?
TLVH431AIDBVT uses the DBZ SOT-23-3 package with pin 1 = CATHODE, pin 2 = ANODE, pin 3 = REF. TLVH432 variants use inverted pinout: pin 1 = REF, pin 2 = CATHODE, pin 3 = ANODE (per Figure 4-5). This difference prevents direct substitution without PCB layout modification. The TLVH431AIDBVT pinout matches industry-standard TL431 footprints, easing migration from legacy designs.
TLVH431AIDBVT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- SC-74A, SOT-753
- 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:
- ±1%
- 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-23-5
TLVH431AIDBVT FAQ
1.How can I place an order for TLVH431AIDBVT through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH431AIDBVT 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 TLVH431AIDBVT reliable?
The price and inventory of TLVH431AIDBVT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431AIDBVT is usually 5 days.
3.What payment methods are accepted for TLVH431AIDBVT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH431AIDBVT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLVH431AIDBVT?
TLVH431AIDBVT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH431AIDBVT 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 TLVH431AIDBVT?
For technical support, including TLVH431AIDBVT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431AIDBVT requirements.
6.How does Aetrix verify that TLVH431AIDBVT is sourced from the original manufacturer or authorized distributors?
All TLVH431AIDBVT 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 TLVH431AIDBVT meets industry standards.
7.What is the process for return or replacement of TLVH431AIDBVT?
All TLVH431AIDBVT units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431AIDBVT, 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 TLVH431AIDBVT part is unused and in its original packaging.
Return procedure for TLVH431AIDBVT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH431AIDBVT Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
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AZ431LANTR-G1
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