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Texas Instruments TLVH432IDBZTG4
- Part No.:
- TLVH432IDBZTG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TLVH432IDBZTG4.pdf
- Description:
- IC VREF SHUNT ADJ 1.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,999
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Product details
Overview
TLVH432IDBZTG4 from Texas Instruments is a low-voltage adjustable precision shunt regulator with 1.24 V reference voltage, ±0.5% initial tolerance at 25°C (B-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 TLVH432IDBZTG4 datasheet, TLVH432IDBZTG4 pinout, TLVH432IDBZTG4 application, or TLVH432IDBZTG4 equivalent, key selection criteria include reference accuracy over –40°C to +125°C, cathode current range (100 µA–70 mA), dynamic impedance stability, SOT-23-3 pin compatibility, and open-loop comparator functionality with integrated reference.
Technical Context
The TLVH432IDBZTG4 implements a three-terminal shunt-regulator architecture with an internal 1.24 V bandgap reference and high-gain transconductance amplifier driving a Darlington sink output stage. Its functional block includes reference, error amplifier, and output transistor - enabling both closed-loop regulation (e.g., secondary-side voltage control) and open-loop comparator operation.
Unlike the TLVH431, the TLVH432IDBZTG4 uses reversed pinout in SOT-23-3: Pin 1 = REF, Pin 2 = CATHODE, Pin 3 = ANODE. This configuration simplifies PCB layout when interfacing with optocouplers in isolated power supplies and avoids signal routing conflicts common with TLVH431's CATHODE–ANODE–REF ordering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V ±0.5% at 25°C - enables precise low-voltage regulation starting at 1.24 V, critical for 3.3 V and lower SMPS designs |
| Temp Range | –40°C to +125°C - qualified for automotive and industrial environments without derating |
| Cathode Current Range | 100 µA to 70 mA - supports ultra-low-power monitoring and high-current shunt regulation |
| Dynamic Impedance | 0.25 Ω typical - ensures stable regulation under load transients; total circuit impedance scales with external resistor ratio |
| Output Voltage Range | 1.24 V to 18 V - set via two external resistors; no minimum headroom beyond VREF |
| Reference Input Current | 0.1–0.5 µA - minimizes resistor-divider loading error and enables high-impedance feedback networks |
| Off-State Cathode Current | 0.02–0.1 µA - guarantees low leakage during system standby or fault conditions |
Pinout & Package
SOT-23-3 package (2.92 mm × 1.30 mm body size), surface-mount, lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1: REF | Reference input | High-impedance node sensing voltage divider output; must be connected externally - not left floating |
| Pin 2: CATHODE | Shunt current output | Sink terminal carrying regulated current; connects to optocoupler LED anode or feedback network |
| Pin 3: ANODE | Common return | Typically grounded or tied to system common; forms reference point for VKA and IK |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Starts regulation at 1.24 V - enables use in 1.8 V, 2.5 V, and 3.3 V systems where legacy TL431 fails |
| Sharp turn-on characteristic | High open-loop gain ensures fast comparator response - eliminates need for external hysteresis in voltage-monitoring circuits |
| No output capacitor required | Internally compensated - stable with zero output capacitance, reducing BOM count and board space in compact SMPS designs |
| Ultra-low reference current | 0.1 µA min IREF - allows >1 MΩ feedback dividers without accuracy degradation or thermal drift |
| Reversed SOT-23 pinout | REF–CATHODE–ANODE ordering - matches optocoupler anode-cathode polarity and eases routing in isolated feedback paths |
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 battery-powered instrumentation. IC Role / Device Role / Timing Role: Adjustable shunt reference generating 2.048 V or 4.096 V from 3.3 V rail using R1/R2 divider; replaces discrete Zener + op-amp combos. Use Value: ±0.5% initial tolerance and <31 mV full-range deviation ensure <1 LSB error across –40°C to +125°C for 12-bit converters. | Use Scenario: Closed-loop voltage sensing on secondary side of 3.3 V isolated flyback converter powering industrial IoT sensors. IC Role / Device Role / Timing Role: Error amplifier + reference in optocoupler feedback path; compares sampled output against internal 1.24 V and drives opto-LED current. Use Value: 100 µA minimum cathode current enables regulation at light loads; 0.25 Ω impedance maintains tight output regulation under dynamic load steps. |
| Zener Diode Replacement | Voltage Monitoring for Power Rails |
Use Scenario: Replacing 2.5 V or 3.3 V Zener diodes in on-board LDO pre-bias or bias supply circuits. IC Role / Device Role / Timing Role: Precision shunt element providing stable clamping voltage with 10× lower leakage than 1N47xx series Zeners. Use Value: 0.02 µA off-state cathode current reduces standby power by >95% versus 10 µA Zener leakage; ±0.5% tolerance improves system margin. | Use Scenario: Monitoring 5 V or 12 V system rails for brown-out detection in automotive body control modules. IC Role / Device Role / Timing Role: Open-loop comparator comparing rail voltage against 1.24 V reference via resistor divider; outputs logic-level flag when threshold crossed. Use Value: High open-loop gain ensures clean switching with <10 mV hysteresis; operates reliably at –40°C with no external components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH432ACDBZT | 1% initial reference tolerance (A-grade) vs 0.5% (B-grade); otherwise identical electrical specs and pinout | Suitable where ±1% regulation accuracy suffices - e.g., non-critical bias supplies or coarse voltage monitors | Select TLVH432ACDBZT only if cost sensitivity outweighs need for <1 LSB ADC reference accuracy or tight SMPS regulation. |
| TLVH431IDBZT | Same B-grade tolerance and temp range, but SOT-23-3 pinout is CATHODE–REF–ANODE (not REF–CATHODE–ANODE) | Requires PCB layout revision to route feedback signal to Pin 2 instead of Pin 1; incompatible drop-in replacement | Choose TLVH431IDBZT only when redesigning for legacy TLVH431 footprint compatibility or when existing layout already accommodates its pin order. |
Compared with TLVH432ACDBZT and TLVH431IDBZT, TLVH432IDBZTG4 uniquely combines ±0.5% reference accuracy, –40°C to +125°C qualification, and REF-first SOT-23-3 pinout - making it optimal for high-precision, thermally demanding, optocoupler-coupled power supply designs where layout efficiency and regulation fidelity are co-prioritized.
Availability
TLVH432IDBZTG4 is available at Aetrix Electronics and suitable for isolated flyback SMPS, precision ADC references, and automotive voltage monitoring applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for TLVH432IDBZTG4 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 precision analog, power management, and interface technologies.
The TLVH432IDBZTG4 belongs to TI's precision shunt regulator product line, engineered specifically for low-voltage, high-accuracy feedback in isolated power supplies and sensor signal chains where thermal stability and minimal quiescent current are essential.
FAQ
What is the reference voltage tolerance of TLVH432IDBZTG4 at 25°C?
The TLVH432IDBZTG4 has a reference voltage tolerance of ±0.5% at 25°C, corresponding to the 'B' grade designation in its part number. This means its VREF falls between 1.234 V and 1.246 V under nominal conditions, verified per TI's SLVS555N datasheet Section 5.7. This tight tolerance directly supports high-resolution data converter references and tightly regulated SMPS outputs.
How does the pinout of TLVH432IDBZTG4 differ from TLVH431IDBZT?
The TLVH432IDBZTG4 uses REF–CATHODE–ANODE pinout in its SOT-23-3 package (Pin 1 = REF, Pin 2 = CATHODE, Pin 3 = ANODE), whereas TLVH431IDBZT uses CATHODE–REF–ANODE (Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE). This reversal optimizes routing to optocoupler anodes in isolated feedback paths and is explicitly documented in Figures 4-4 and 4-5 of the TLVH432IDBZTG4 datasheet.
What is the minimum cathode current required for regulation in TLVH432IDBZTG4?
The TLVH432IDBZTG4 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 holds across the full operating temperature range (–40°C to +125°C) and enables reliable startup and light-load regulation in energy-efficient power supplies where legacy TL431 would fail.
Can TLVH432IDBZTG4 operate without an output capacitor?
Yes, TLVH432IDBZTG4 is internally compensated and remains stable without an output capacitor between cathode and anode - a key advantage over many linear regulators. Section 7.3 of the datasheet confirms this behavior, noting that external capacitors are optional and only needed when specific phase-margin requirements exceed the device's native stability under capacitive load conditions.
What is the maximum cathode voltage rating for TLVH432IDBZTG4?
The absolute maximum cathode voltage (VKA) for TLVH432IDBZTG4 is 20 V, as stated in Section 5.1 Absolute Maximum Ratings. However, the recommended operating range is VREF to 18 V (Section 5.3), meaning the device is designed to regulate stably up to 18 V cathode-to-anode voltage while maintaining specified performance and reliability.
TLVH432IDBZTG4 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:
- Obsolete
- 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
TLVH432IDBZTG4 FAQ
1.How can I place an order for TLVH432IDBZTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH432IDBZTG4 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 TLVH432IDBZTG4 reliable?
The price and inventory of TLVH432IDBZTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH432IDBZTG4 is usually 5 days.
3.What payment methods are accepted for TLVH432IDBZTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH432IDBZTG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLVH432IDBZTG4?
TLVH432IDBZTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH432IDBZTG4 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 TLVH432IDBZTG4?
For technical support, including TLVH432IDBZTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH432IDBZTG4 requirements.
6.How does Aetrix verify that TLVH432IDBZTG4 is sourced from the original manufacturer or authorized distributors?
All TLVH432IDBZTG4 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 TLVH432IDBZTG4 meets industry standards.
7.What is the process for return or replacement of TLVH432IDBZTG4?
All TLVH432IDBZTG4 units undergo pre-shipment inspection (PSI). If there is an issue with TLVH432IDBZTG4, 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 TLVH432IDBZTG4 part is unused and in its original packaging.
Return procedure for TLVH432IDBZTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH432IDBZTG4 Tags
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