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Texas Instruments TLVH431AIDBZTG4
- Part No.:
- TLVH431AIDBZTG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TLVH431AIDBZTG4.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,884
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Product details
Overview
TLVH431AIDBZTG4 from Texas Instruments is a low-voltage adjustable precision shunt regulator with 1% initial reference voltage tolerance at 25°C, 1.24 V nominal reference voltage, 100 μA minimum cathode current for regulation, and operation over –40°C to +125°C. It functions as an integrated voltage reference and error amplifier in isolated flyback SMPS feedback loops, replacing Zener diodes in low-leakage on-board regulation.
For engineers reviewing the TLVH431AIDBZTG4 datasheet, TLVH431AIDBZTG4 pinout, TLVH431AIDBZTG4 application, or TLVH431AIDBZTG4 equivalent, key selection criteria include reference accuracy across temperature, cathode current range (100 μA–70 mA), dynamic impedance (0.25 Ω), SOT-23-3 package compatibility, and open/closed-loop functional modes for comparator or shunt regulation use cases.
Technical Context
The TLVH431AIDBZTG4 implements a three-terminal shunt-regulator architecture with an internal 1.24 V bandgap reference and high-gain NPN-based error amplifier. Its Darlington output stage enables sharp turn-on characteristics and stable operation without external compensation capacitors.
It operates in two distinct functional modes: open-loop comparator mode (with integrated reference) for voltage monitoring, and closed-loop shunt regulation mode (with resistive feedback from cathode to reference) for precise output voltage control between 1.24 V and 18 V. Thermal stability is specified across –40°C to +125°C for automotive-grade applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V ±1% at 25°C - sets minimum adjustable output voltage and defines accuracy baseline for feedback networks |
| Cathode Current Range | 100 μA to 70 mA - supports ultra-low-power biasing and robust regulation under load transients |
| Dynamic Impedance | 0.25 Ω typical - ensures tight output voltage regulation against cathode current variations |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive and industrial environments |
| Output Voltage Range | 1.24 V to 18 V - achieved via two external resistors, enabling flexible system-level voltage scaling |
| Reference Input Current | 0.1–0.5 μA - minimizes resistor-divider loading error and improves accuracy in high-impedance feedback paths |
| Line Regulation | –1.5 to –2.7 mV/V - quantifies reference voltage drift versus cathode voltage changes, critical for wide-input-range supplies |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92 mm × 1.30 mm body, 3-pin surface-mount, lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: CATHODE | Shunt current sink input | Primary current path for regulation; connects to supply rail or optocoupler LED anode in isolated feedback |
| 2: REF | Reference voltage sense input | High-impedance node comparing external voltage to internal 1.24 V reference; requires ≥0.1 μA bias current |
| 3: ANODE | Common return terminal | Typically connected to system ground or low-side return; serves as reference point for all voltages and currents |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | 1.24 V reference enables regulation in 1.8 V, 2.5 V, and 3.3 V systems where TL431 (2.5 V) cannot function |
| Ultra-low minimum cathode current | 100 μA allows stable regulation in battery-powered or standby-mode circuits with microamp-level quiescent current budgets |
| Integrated reference + amplifier | Eliminates need for external precision reference and op-amp in comparator or error-amplifier configurations |
| Stable without output capacitor | Internally compensated design avoids mandatory cathode-to-anode capacitance, simplifying layout and improving reliability |
| Wide temperature specification | –40°C to +125°C operation supports automotive AEC-Q100-qualified designs without derating |
Applications
| Secondary-Side Regulation in Isolated Flyback SMPS | Zener Diode Replacement |
|---|---|
Use Scenario: Used with optocoupler in secondary-side feedback loop of 3.3 V isolated flyback converter to regulate output voltage tightly. IC Role / Device Role / Timing Role: Functions as combined voltage reference and error amplifier, comparing sampled output to 1.24 V internal reference and adjusting optocoupler LED current. Use Value: Enables regulated output as low as 2.7 V DC (1.24 V + optocoupler VF), outperforming TL431 in low-voltage isolated topologies. | Use Scenario: Replaces discrete 2.4 V or 3.3 V Zener diodes in on-board 5 V or 12 V rail monitoring and clamping circuits. IC Role / Device Role / Timing Role: Acts as programmable shunt regulator with 0.25 Ω dynamic impedance and <0.1 μA off-state leakage. Use Value: Reduces leakage current by >10× versus standard Zeners, improving standby efficiency and thermal stability. |
| Voltage Monitoring for Power Rails | Comparator with Integrated Reference |
Use Scenario: Monitors 3.3 V or 5 V system rails for undervoltage lockout (UVLO) or brownout detection in industrial controllers. IC Role / Device Role / Timing Role: Operates in open-loop comparator mode, asserting fault signal when rail drops below threshold set by resistor divider on REF pin. Use Value: Eliminates need for external reference IC and comparator, reducing BOM count and PCB area in space-constrained modules. | Use Scenario: Implements level-shifting or logic-threshold comparison in sensor interface circuits with single-supply 3.3 V or 5 V operation. IC Role / Device Role / Timing Role: Functions as comparator with built-in 1.24 V reference; output swings rail-to-rail based on REF pin voltage vs internal threshold. Use Value: Provides sub-1% threshold accuracy over temperature without trimming, improving repeatability in production test fixtures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431BIDBZT | 0.5% initial reference tolerance (vs 1% for TLVH431AIDBZTG4); otherwise identical electrical specs and pinout | Better accuracy required for high-precision data converter references or metrology-grade power supplies | Select when tighter VREF tolerance justifies cost premium and thermal drift performance is acceptable |
| TLV431ACDBVR | Lower 1.24 V reference but only rated to 6 V cathode voltage (vs 18 V); 1% tolerance; SOT-23-5 package with NC pins | Limited to low-voltage (<6 V) applications; not suitable for 12 V/15 V/18 V regulation or high-headroom flyback designs | Choose only for cost-sensitive, low-voltage (<6 V), space-constrained applications where full 18 V range is unnecessary |
Compared with TLVH431BIDBZT and TLV431ACDBVR, the TLVH431AIDBZTG4 balances 1% accuracy, 18 V cathode capability, and SOT-23-3 footprint-making it optimal for automotive and industrial isolated SMPS where headroom, thermal range, and board space are jointly constrained.
Availability
TLVH431AIDBZTG4 is available at Aetrix Electronics and suitable for isolated flyback SMPS, voltage monitoring systems, and low-leakage Zener replacement applications requiring stable component supply across automotive, industrial, and telecom end equipment.
Supply support for TLVH431AIDBZTG4 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 power management, signal chain, and high-reliability components.
The TLVH431 family was designed for low-voltage precision shunt regulation in isolated power supplies and voltage-monitoring systems, targeting automotive, industrial, and computing applications demanding extended temperature operation and high accuracy.
FAQ
What is the reference voltage tolerance of TLVH431AIDBZTG4 at 25°C?
The TLVH431AIDBZTG4 has a reference voltage tolerance of ±1% at 25°C, corresponding to a 1.24 V nominal value with a range of 1.228 V to 1.252 V. This grade 'A' tolerance is confirmed in Section 5.6 of the TI datasheet SLVS555N and applies specifically to the TLVH431A variant in DBZ packaging. The device maintains this accuracy across its full operating temperature range when used within recommended conditions.
Can TLVH431AIDBZTG4 operate with cathode voltages below 2.5 V?
Yes, TLVH431AIDBZTG4 is explicitly designed for low-voltage operation down to 1.24 V, unlike the TL431 (2.5 V). It regulates stably with cathode voltages from 1.24 V to 18 V when configured with appropriate external resistors. This makes TLVH431AIDBZTG4 suitable for 1.8 V, 2.5 V, and 3.3 V systems where higher-voltage references cannot function, as verified in the "Low-voltage operation" feature and Figure 6-2 of the datasheet.
What is the minimum cathode current required for regulation in TLVH431AIDBZTG4?
The TLVH431AIDBZTG4 requires a minimum cathode current of 100 μA to maintain regulation, as specified in Section 5.5 (IK(min)) of the datasheet. This value is valid across the full temperature range (–40°C to +125°C) and is lower than TL431's 1 mA requirement-enabling use in ultra-low-power applications such as battery-backed monitoring circuits and standby-mode power supplies.
Does TLVH431AIDBZTG4 require an output capacitor for stability?
No, TLVH431AIDBZTG4 is internally compensated and stable without an output capacitor between cathode and anode, per Section 7.3 of the datasheet. However, if an output 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 100 nF depending on cathode voltage and load conditions.
How does the pinout of TLVH431AIDBZTG4 differ from TLVH432 variants?
TLVH431AIDBZTG4 uses the SOT-23-3 (DBZ) pinout: Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE. In contrast, TLVH432DBZ swaps REF and ANODE (Pin 1 = CATHODE, Pin 2 = ANODE, Pin 3 = REF), as shown in Figures 4-4 and 4-5 of the datasheet. This difference prevents direct substitution without PCB layout revision, and TLVH431AIDBZTG4 must be used with the TLVH431-specific pin assignment.
TLVH431AIDBZTG4 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:
- ±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-23-3
TLVH431AIDBZTG4 FAQ
1.How can I place an order for TLVH431AIDBZTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH431AIDBZTG4 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 TLVH431AIDBZTG4 reliable?
The price and inventory of TLVH431AIDBZTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431AIDBZTG4 is usually 5 days.
3.What payment methods are accepted for TLVH431AIDBZTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH431AIDBZTG4 transactions.
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4.How is shipping managed for TLVH431AIDBZTG4?
TLVH431AIDBZTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH431AIDBZTG4 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 TLVH431AIDBZTG4?
For technical support, including TLVH431AIDBZTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431AIDBZTG4 requirements.
6.How does Aetrix verify that TLVH431AIDBZTG4 is sourced from the original manufacturer or authorized distributors?
All TLVH431AIDBZTG4 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 TLVH431AIDBZTG4 meets industry standards.
7.What is the process for return or replacement of TLVH431AIDBZTG4?
All TLVH431AIDBZTG4 units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431AIDBZTG4, 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 TLVH431AIDBZTG4 part is unused and in its original packaging.
Return procedure for TLVH431AIDBZTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH431AIDBZTG4 Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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AN431AN-ATRG1
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LM4040CYM3-2.5-TR
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LM4040CYM3-4.1-TR
Microchip Technology
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LM4040EIM3-2.5/NOPB
Texas Instruments
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AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
Texas Instruments
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LM4041DIM3-ADJ/NOPB
Texas Instruments
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
Texas Instruments
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AZ431LANTR-G1
Diodes Incorporated
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