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Texas Instruments TLVH431ACDBZT
- Part No.:
- TLVH431ACDBZT
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TLVH431ACDBZT.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,140
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Product details
Overview
TLVH431ACDBZT from Texas Instruments is a low-voltage adjustable precision shunt regulator with 1.24 V reference voltage, ±0.5% initial tolerance at 25°C (A-grade), and operation down to 100 µA cathode current. It delivers 0.25 Ω typical dynamic impedance and supports output voltage adjustment from 1.24 V to 18 V using two external resistors. It serves as a Zener replacement and error amplifier in isolated flyback SMPS feedback loops.
For engineers reviewing the TLVH431ACDBZT datasheet, TLVH431ACDBZT pinout, TLVH431ACDBZT application, or TLVH431ACDBZT equivalent, key selection criteria include reference accuracy over temperature, minimum cathode current for regulation, dynamic impedance, open-loop comparator capability, and SOT-23-3 package compatibility with legacy TL431-based designs.
Technical Context
The TLVH431ACDBZT integrates a 1.24 V bandgap reference and high-gain transconductance amplifier driving a Darlington sink output stage. Its internal architecture enables stable closed-loop shunt regulation without external compensation, while supporting open-loop comparator operation with integrated reference.
It operates across –40°C to +125°C (Q-grade thermal range), maintains <12 mV VREF deviation over full temperature range, and exhibits <0.5 µA reference terminal current - enabling ultra-low-power monitoring and precision biasing in battery-sensitive systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V ±0.5% at 25°C - sets precise regulation threshold for feedback networks |
| Cathode Current Range | 100 µA to 70 mA - enables operation in ultra-low-power monitoring and higher-current shunt regulation |
| Dynamic Impedance | 0.25 Ω typical - ensures tight output voltage stability under load transients |
| Temperature Range | –40°C to +125°C - qualified for automotive under-hood and industrial control environments |
| Output Voltage Range | 1.24 V to 18 V (adjustable) - supports wide-range power rail sensing and programmable references |
| Reference Input Current | 0.1–0.5 µA - minimizes resistor-divider loading error in high-impedance feedback networks |
| VREF vs Cathode Voltage | –1.5 to –2.7 mV/V - quantifies reference stability under varying cathode supply conditions |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92 mm × 1.30 mm body, 3-pin surface-mount outline with gull-wing leads. Thermal resistance RθJA = 206 °C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CATHODE | Shunt current input/output node | Sinks regulated current; connects to feedback network output or optocoupler LED anode in isolated supplies |
| 2 - REF | Reference input threshold node | Compares external voltage to internal 1.24 V reference; requires ≥0.1 µA bias current |
| 3 - ANODE | Common return path | Typically connected to system ground or negative rail; forms reference potential for cathode and REF pins |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Starts regulating at 1.24 V - enables use in 1.8 V, 2.5 V, and 3.3 V systems where TL431 cannot function |
| Ultra-low IK(min) | 100 µA minimum cathode current - reduces standby power in always-on monitoring circuits |
| Integrated comparator mode | No external reference needed - simplifies overvoltage/undervoltage detection with single-component solution |
| Stable without output capacitor | Internally compensated - eliminates need for stability-tuning capacitor in most shunt regulator configurations |
| Low leakage off-state | 20–100 nA off-state cathode current - preserves battery life in shutdown or sleep modes |
Applications
| Adjustable Voltage Reference for Data Converters | Secondary Side Regulation in Flyback SMPS |
|---|---|
|
Use Scenario: Providing precise, temperature-stable reference voltage for 12–16-bit SAR and delta-sigma ADCs in industrial data acquisition modules. IC Role / Device Role / Timing Role: Adjustable shunt reference generating VREF = 1.24 V × (1 + R1/R2) with <12 mV drift over –40°C to +125°C. Use Value: Eliminates need for external trimming or high-precision fixed references, reducing BOM count and calibration effort. |
Use Scenario: Regulating 3.3 V output in isolated flyback converters using optocoupler feedback, especially in space-constrained AC/DC adapters. IC Role / Device Role / Timing Role: Error amplifier and voltage reference in secondary-side feedback loop; interfaces directly with PC817/PC817x optocouplers. Use Value: Enables regulation down to 2.7 V output (1.24 V + 1.4 V LED drop), supporting modern low-voltage rails with tighter tolerances. |
| Zener Diode Replacement | Voltage Monitoring for Power Rails |
|
Use Scenario: Replacing 2.4 V–3.9 V Zener diodes in on-board LDO bias networks and analog sensor excitation circuits. IC Role / Device Role / Timing Role: Precision shunt element with 0.25 Ω dynamic impedance and <0.5 µA reference current - minimizing divider error. Use Value: Reduces temperature coefficient by >5× versus standard Zeners, improving long-term DC accuracy in unregulated supplies. |
Use Scenario: Monitoring 5 V, 3.3 V, or 1.8 V system rails for brownout detection and fault logging in embedded controllers. IC Role / Device Role / Timing Role: Open-loop comparator comparing rail voltage to internal 1.24 V reference via resistor divider. Use Value: Delivers fast response (<1 µs rise time) and eliminates external reference IC, saving PCB area and cost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431BIDBZT | 1.24 V reference with ±0.5% tolerance (B-grade), same DBZ package and pinout | Identical functionality; differs only in tighter initial tolerance specification | Select when tighter initial accuracy is required without changing layout or circuit design |
| TLV431ACDBZR | Lower 1.24 V reference but rated only to +85°C (I-grade), SOT-23-3 (DBZ) package | Limited temperature range; unsuitable for automotive or extended industrial environments | Choose only for cost-sensitive commercial applications operating below 85°C ambient |
Compared with TLVH431ACDBZT, TLVH431BIDBZT offers identical performance with improved initial tolerance, while TLV431ACDBZR sacrifices thermal robustness for lower unit cost - making TLVH431ACDBZT the optimal balance of precision, reliability, and wide-temperature operation.
Availability
TLVH431ACDBZT is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and medical sensor modules requiring stable component supply with guaranteed long-term availability.
Supply support for TLVH431ACDBZT 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 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 isolated power supplies and precision monitoring - extending the TL431 architecture to 1.24 V operation with enhanced thermal stability and reduced minimum cathode current.
FAQ
What is the reference voltage tolerance of TLVH431ACDBZT at 25°C?
The TLVH431ACDBZT has a reference voltage tolerance of ±0.5% at 25°C, corresponding to a 1.24 V nominal reference with a range of 1.234 V to 1.246 V. This A-grade tolerance is confirmed in Section 5.6 of the TI datasheet SLVS555N and applies specifically to the TLVH431ACDBZT variant in the SOT-23-3 (DBZ) package.
Can TLVH431ACDBZT operate in open-loop comparator mode?
Yes, TLVH431ACDBZT can operate as a comparator with integrated reference. When configured with proper cathode current (≥100 µA), it compares the voltage at the REF pin to its internal 1.24 V reference and drives the CATHODE pin low when the REF voltage exceeds the threshold. This mode is explicitly supported in Section 7.4.1 and Figure 8-2 of the TLVH431ACDBZT datasheet.
What is the minimum cathode current required for regulation in TLVH431ACDBZT?
The TLVH431ACDBZT 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 operating temperature range and is critical for ensuring sufficient gain in both shunt regulator and comparator configurations.
Does TLVH431ACDBZT require an output capacitor for stability?
No, TLVH431ACDBZT is internally compensated and does not require an output capacitor between CATHODE and ANODE for basic shunt regulator stability. However, if a capacitive load is used, Figures 5-15 through 5-17 in the datasheet provide phase margin guidance for selecting appropriate capacitor values to maintain stability.
What is the maximum cathode voltage rating for TLVH431ACDBZT?
The absolute maximum cathode voltage (VKA) for TLVH431ACDBZT is 20 V, as stated in Section 5.1 (Absolute Maximum Ratings) of the datasheet. The recommended operating range extends from VREF (1.24 V) up to 18 V, making it suitable for regulation in 12 V and 15 V systems.
TLVH431ACDBZT 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:
- ±1%
- 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
TLVH431ACDBZT FAQ
1.How can I place an order for TLVH431ACDBZT through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH431ACDBZT 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 TLVH431ACDBZT reliable?
The price and inventory of TLVH431ACDBZT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431ACDBZT is usually 5 days.
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Once your TLVH431ACDBZT 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 TLVH431ACDBZT?
For technical support, including TLVH431ACDBZT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431ACDBZT requirements.
6.How does Aetrix verify that TLVH431ACDBZT is sourced from the original manufacturer or authorized distributors?
All TLVH431ACDBZT 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 TLVH431ACDBZT meets industry standards.
7.What is the process for return or replacement of TLVH431ACDBZT?
All TLVH431ACDBZT units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431ACDBZT, 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 TLVH431ACDBZT part is unused and in its original packaging.
Return procedure for TLVH431ACDBZT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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