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Texas Instruments TLVH432QDBZT
- Part No.:
- TLVH432QDBZT
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TLVH432QDBZT.pdf
- Description:
- IC VREF SHUNT ADJ 1.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:858
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Product details
Overview
TLVH432QDBZT from Texas Instruments is a low-voltage adjustable precision shunt regulator in SOT-23-3 package, featuring 1.24 V reference voltage (±0.5% at 25°C), operation down to 1.24 V cathode-anode voltage, and 100 μA to 70 mA cathode current range. It serves as an integrated voltage reference and error amplifier in isolated flyback SMPS feedback loops, replacing Zener diodes with lower leakage and sharper turn-on.
For engineers reviewing the TLVH432QDBZT datasheet, TLVH432QDBZT pinout, TLVH432QDBZT application, or TLVH432QDBZT equivalent, key selection criteria include its Q-grade (–40°C to +125°C), 0.25 Ω dynamic impedance, 0.1 μA typical reference input current, and distinct SOT-23-3 pinout (REF–CATHODE–ANODE) versus TLVH431 variants.
Technical Context
The TLVH432QDBZT implements a three-terminal shunt-regulator architecture with an internal 1.24 V bandgap reference and high-gain NPN-based error amplifier driving a Darlington output stage. Its open-loop mode enables comparator functionality with built-in reference, while closed-loop operation-using external resistive feedback between cathode and reference pins-enables precise voltage regulation from 1.24 V to 18 V.
Unlike the TLVH431 family, the TLVH432QDBZT uses a fixed REF–CATHODE–ANODE pinout in SOT-23-3 (Figure 4-5), eliminating ambiguity in PCB layout for secondary-side feedback circuits. It is fully specified across –40°C to +125°C (Q-grade), with thermal stability maintained via on-die compensation and <31 mV VREF deviation over full temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V ±0.5% at 25°C; sets minimum regulation point and defines feedback divider ratio accuracy. |
| Operating Voltage Range | 1.24 V to 18 V cathode-to-anode; supports regulation of 3.3 V, 5 V, and 12 V rails without external boost. |
| Cathode Current Range | 100 μA to 70 mA; enables stable regulation in ultra-low-power monitoring and higher-current SMPS applications. |
| Dynamic Impedance | 0.25 Ω typical; ensures tight output voltage regulation under load transients in feedback loops. |
| Reference Input Current | 0.1 μA typical; minimizes divider resistor power loss and improves accuracy in high-impedance feedback networks. |
| Temperature Range | –40°C to +125°C (Q-grade); qualified for automotive under-hood and industrial control environments. |
| Output Noise | 25 nV/√Hz at 1 kHz; supports precision data converter references without added filtering. |
Pinout & Package
SOT-23-3 package (2.92 mm × 1.30 mm body size), surface-mount, RoHS-compliant, with gull-wing leads and thermal pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF | Reference input | High-impedance node sensing external feedback voltage; must be connected via resistor divider to cathode for regulation. |
| 2 - CATHODE | Shunt current sink/output | Primary current path; sinks up to 70 mA to maintain regulated voltage; connects to optocoupler LED anode in isolated SMPS. |
| 3 - ANODE | Common return | Ground reference for internal circuitry; must be tied to system ground or power rail common point. |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Starts regulation at 1.24 V cathode-anode differential-enables use in 1.8 V and 3.3 V systems where TL431 fails. |
| Sharp turn-on characteristic | High open-loop gain (>80 dB) and Darlington output deliver fast response in comparator mode, reducing propagation delay in voltage monitors. |
| Internal compensation | No external capacitor required for stability-simplifies layout in space-constrained isolated feedback paths. |
| Ultra-low reference current | 0.1 μA typical Iref allows >1 MΩ feedback dividers, cutting quiescent current by 10× vs Zener alternatives. |
| Q-grade temperature rating | –40°C to +125°C operation with ≤31 mV VREF drift-meets AEC-Q100 stress test requirements for automotive power modules. |
Applications
| Adjustable Voltage Reference for Data Converters | Secondary-Side Regulation in Flyback SMPS |
|---|---|
Use Scenario: Providing stable, low-noise reference voltage to 12-bit to 16-bit SAR and delta-sigma ADCs in battery-powered instrumentation. IC Role / Device Role / Timing Role: Precision shunt reference sourcing <1 μA into ADC reference input; replaces discrete Zener + op-amp combos. Use Value: 0.25 Ω dynamic impedance and 25 nV/√Hz noise ensure <0.5 LSB reference error across temperature and supply variation. | Use Scenario: Closed-loop voltage sensing on secondary side of 3.3 V/5 V isolated flyback converters powering microcontrollers and sensors. IC Role / Device Role / Timing Role: Error amplifier + reference in optocoupler-coupled feedback path; regulates output by modulating opto-LED current. Use Value: REF–CATHODE–ANODE pinout (SOT-23-3) simplifies routing to optocoupler anode; 100 μA IK(min) enables regulation at light loads. |
| Zener Diode Replacement | Voltage Monitoring for Power Rails |
Use Scenario: Replacing 2.5 V or 3.3 V Zener diodes in on-board LDO supervision and bias generation circuits. IC Role / Device Role / Timing Role: Adjustable shunt regulator with programmable knee voltage; operates with <100 μA leakage below regulation threshold. Use Value: 0.1 μA Iref and 0.02 μA IK(off) reduce standby current by >95% versus 500 μA Zener leakage at 18 V reverse bias. | Use Scenario: Monitoring 1.8 V, 3.3 V, or 5 V system rails for brownout detection and fault logging in industrial PLCs. IC Role / Device Role / Timing Role: Comparator with integrated 1.24 V reference; triggers reset or alert when rail drops below programmed threshold. Use Value: Open-loop gain >80 dB ensures clean switching at 10 mV hysteresis; Q-grade rating guarantees reliability in wide-temperature environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431QDBZR | SOT-23-5 package; pin 1 = NC, pin 2 = substrate (must tie to ANODE), pin 3 = CATHODE, pin 4 = REF, pin 5 = ANODE | Same electrical specs but different pinout and footprint; requires PCB redesign for drop-in replacement | Select only if legacy design uses DBZR or needs substrate connection flexibility |
| TLVH432AQDBZT | A-grade (±1% VREF tolerance at 25°C); same Q-temp range and SOT-23-3 pinout | Lower initial accuracy; suitable for cost-sensitive non-precision applications like basic power sequencing | Choose when ±1% reference tolerance meets system requirements and B-grade cost premium is unjustified |
Compared with TLVH431QDBZR, TLVH432QDBZT offers identical thermal and electrical performance in a smaller 3-pin layout-reducing board area by 35% and eliminating substrate connection constraints. Versus TLVH432AQDBZT, the B-grade version delivers tighter reference accuracy critical for high-resolution ADC references and closed-loop SMPS stability margins.
Availability
TLVH432QDBZT is available at Aetrix Electronics and suitable for automotive power modules, industrial SMPS designs, and precision data acquisition systems requiring stable component supply across extended temperature ranges.
Supply support for TLVH432QDBZT 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 ICs, with leadership in precision analog and automotive-qualified components.
The TLVH432QDBZT belongs to TI's precision shunt regulator product line, engineered for high-accuracy, low-voltage feedback in isolated power supplies, voltage monitoring, and reference applications demanding robustness across –40°C to +125°C.
FAQ
What is the exact pin configuration of TLVH432QDBZT?
The TLVH432QDBZT uses a 3-pin SOT-23 package with fixed REF–CATHODE–ANODE pinout (pin 1 = REF, pin 2 = CATHODE, pin 3 = ANODE), as shown in Figure 4-5 of the SLVS555N datasheet. This differs from TLVH431 variants and eliminates ambiguity in feedback loop routing for isolated SMPS designs.
How does TLVH432QDBZT differ from TLVH431QDBZT?
TLVH432QDBZT and TLVH431QDBZT share identical electrical specifications and Q-grade temperature rating, but TLVH432QDBZT uses a dedicated 3-pin SOT-23 pinout (REF–CATHODE–ANODE), whereas TLVH431QDBZT is not offered in DBZ packaging-only TLVH432 variants carry the DBZ suffix and this specific pin assignment.
What is the minimum cathode current required for regulation with TLVH432QDBZT?
The TLVH432QDBZT requires a minimum cathode current of 100 μA to maintain regulation across its full operating temperature range (–40°C to +125°C). At 25°C, regulation is guaranteed down to 60 μA, but design margin mandates using 100 μA as the worst-case specification for TLVH432QDBZT.
Can TLVH432QDBZT replace a standard Zener diode directly?
Yes-TLVH432QDBZT can directly replace Zener diodes in shunt regulation roles, offering superior performance: 0.1 μA reference current vs typical Zener leakage >10 μA, 0.25 Ω dynamic impedance vs >10 Ω for Zeners, and adjustable output from 1.24 V to 18 V using two external resistors instead of fixed-voltage devices.
Is TLVH432QDBZT qualified for automotive applications?
Yes-TLVH432QDBZT carries the "Q" suffix denoting qualification per AEC-Q100 Grade 1 (–40°C to +125°C ambient), with full electrical characterization and reliability testing across that range. It is widely deployed in automotive infotainment power supplies and body control module SMPS feedback circuits.
TLVH432QDBZT 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:
- ±1.5%
- 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
TLVH432QDBZT FAQ
1.How can I place an order for TLVH432QDBZT through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH432QDBZT 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 TLVH432QDBZT reliable?
The price and inventory of TLVH432QDBZT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH432QDBZT is usually 5 days.
3.What payment methods are accepted for TLVH432QDBZT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH432QDBZT transactions.
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4.How is shipping managed for TLVH432QDBZT?
TLVH432QDBZT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH432QDBZT 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 TLVH432QDBZT?
For technical support, including TLVH432QDBZT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH432QDBZT requirements.
6.How does Aetrix verify that TLVH432QDBZT is sourced from the original manufacturer or authorized distributors?
All TLVH432QDBZT 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 TLVH432QDBZT meets industry standards.
7.What is the process for return or replacement of TLVH432QDBZT?
All TLVH432QDBZT units undergo pre-shipment inspection (PSI). If there is an issue with TLVH432QDBZT, 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 TLVH432QDBZT part is unused and in its original packaging.
Return procedure for TLVH432QDBZT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH432QDBZT 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
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LM4040EIM3-2.5/NOPB
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AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
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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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