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Texas Instruments TLVH432QDBZR
- Part No.:
- TLVH432QDBZR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TLVH432QDBZR.pdf
- Description:
- IC VREF SHUNT ADJ 1.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,718
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Product details
Overview
TLVH432QDBZR 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), 100 μA to 70 mA cathode current range, and operation from –40°C to +125°C. It functions as an error amplifier or comparator with integrated reference in isolated flyback SMPS feedback loops and low-voltage Zener replacement applications.
For engineers reviewing the TLVH432QDBZR datasheet, TLVH432QDBZR pinout, TLVH432QDBZR application, or TLVH432QDBZR equivalent, key selection criteria include reference tolerance grade (Q-grade = ±0.5%), cathode-to-anode voltage headroom (≥1.24 V), dynamic impedance (0.25 Ω), thermal stability over automotive temperature range, and compatibility with optocoupler-based secondary-side regulation circuits.
Technical Context
The TLVH432QDBZR implements a precision bandgap reference and high-gain transconductance amplifier in a 3-terminal shunt topology. Its internal architecture forces the REF pin to 1.24 V when cathode current exceeds 100 μA and cathode-to-anode voltage ≥1.24 V, enabling closed-loop regulation via external resistor dividers or open-loop comparator operation.
Unlike the TLVH431, the TLVH432QDBZR uses reversed pinout (REF–CATHODE–ANODE) in SOT-23-3, optimizing PCB layout for feedback networks in compact isolated power supplies. It requires no external compensation capacitor for stability across its full operating current range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V ±0.5% at 25°C; sets minimum output voltage in adjustable regulator configurations |
| Cathode Current Range | 100 μA to 70 mA; defines minimum bias requirement and maximum shunt capability |
| Operating Temperature | –40°C to +125°C; qualified for automotive under-hood and industrial control environments |
| Dynamic Impedance | 0.25 Ω typical; determines output voltage ripple rejection and regulation accuracy under load transients |
| Reference Input Current | 0.1–0.5 μA; enables high-impedance feedback networks without significant divider loading error |
| VKA Range | 1.24 V to 18 V; supports regulation of 3.3 V, 5 V, 12 V, and 15 V rails using two external resistors |
| Output Noise | 25 nV/√Hz at 1 kHz; critical for high-resolution data converter reference applications |
Pinout & Package
SOT-23-3 package (2.92 mm × 1.30 mm body size) with gull-wing leads; moisture sensitivity level 1; RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF | Reference input | High-impedance node sensing feedback voltage; must be connected to resistor divider junction |
| 2 - CATHODE | Shunt current output | Sinks current to maintain REF at 1.24 V; connects to optocoupler LED anode or regulation node |
| 3 - ANODE | Common return | Typically tied to system ground or power rail return; serves as voltage reference point for REF and CATHODE |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Starts regulation at 1.24 V cathode-to-anode headroom-enables use in 1.8 V and 2.5 V systems where TL431 fails |
| Ultra-low reference current | 0.1–0.5 μA max-permits >1 MΩ feedback dividers without compromising accuracy or temperature drift |
| Automotive-grade qualification | Q-grade (–40°C to +125°C) with 0.5% initial tolerance-meets AEC-Q100 stress test requirements for safety-critical power monitoring |
| Stable without output capacitor | Internally compensated-eliminates need for external ceramic capacitor in space-constrained flyback designs |
| Sharp turn-on characteristic | Sub-100 ns response to reference threshold crossing-supports fast voltage monitoring and overvoltage latch detection |
Applications
| Secondary-Side Regulation in Flyback SMPS | Zener Diode Replacement |
|---|---|
Use Scenario: Used with PC817 optocoupler in 3.3 V isolated flyback converter to regulate output voltage on secondary side. IC Role / Device Role / Timing Role: Acts as error amplifier and precision voltage reference, comparing sampled output to 1.24 V and adjusting optocoupler LED current. Use Value: Enables stable regulation down to 2.7 V output while maintaining <±1% total error across line/load/temperature. | Use Scenario: Replaces 3.3 V Zener diode in microcontroller reset circuit with tighter voltage tolerance and lower leakage. IC Role / Device Role / Timing Role: Functions as programmable shunt reference with 0.02–0.1 μA off-state cathode current below threshold. Use Value: Reduces standby power by >95% versus standard Zener, improving battery life in always-on monitoring nodes. |
| Voltage Monitoring for Power Rails | Adjustable Reference for Data Converters |
Use Scenario: Monitors 5 V supply rail in automotive ECU to trigger fault flag if voltage drops below 4.75 V. IC Role / Device Role / Timing Role: Operates in open-loop comparator mode with REF pin biased to 4.75 V via resistor divider. Use Value: Provides accurate, temperature-stable trip point (±1.5 mV/°C drift) without external op-amp or reference IC. | Use Scenario: Sets precise reference voltage for 16-bit SAR ADC in industrial sensor interface module. IC Role / Device Role / Timing Role: Supplies low-noise, low-drift reference to ADC REF+ pin via buffered divider network. Use Value: Limits reference-induced INL error to <0.5 LSB across –40°C to +125°C, meeting EN 61000-6-4 immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH432ADBZR | 1% reference tolerance (A-grade) vs 0.5% (Q-grade); identical pinout, package, and electrical specs otherwise | Suitable for commercial/industrial temperature range (–40°C to +85°C) but not automotive extended range | Select TLVH432ADBZR only when cost sensitivity outweighs need for automotive-grade thermal stability and tighter initial tolerance |
| TLVH431QDBZR | Different pinout (CATHODE–ANODE–REF) in same SOT-23-3 package; identical Q-grade specs and performance | Requires PCB layout revision due to reversed terminal order; not drop-in compatible without trace modification | Choose TLVH431QDBZR only when existing design uses TLVH431 pinout or when REF-to-ground routing simplifies layout |
Compared with TLVH432ADBZR and TLVH431QDBZR, the TLVH432QDBZR uniquely combines automotive temperature range, 0.5% reference accuracy, and TLVH432-specific pinout-making it optimal for new designs targeting AEC-Q100 compliance and minimal feedback loop area in isolated DC/DC converters.
Availability
TLVH432QDBZR is available at Aetrix Electronics and suitable for automotive power management, industrial sensor interfaces, and isolated flyback SMPS requiring stable component supply with guaranteed long-term availability and full traceability.
Supply support for TLVH432QDBZR 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 reference and power conversion technologies.
The TLVH432QDBZR belongs to TI's precision shunt regulator product line, designed specifically for high-accuracy, low-voltage secondary-side regulation in isolated switching power supplies and robust voltage monitoring in harsh-temperature environments.
FAQ
What is the reference voltage tolerance of TLVH432QDBZR at 25°C?
The TLVH432QDBZR has a reference voltage tolerance of ±0.5% at 25°C, corresponding to a 1.24 V nominal reference with min/max values of 1.234 V and 1.246 V. This Q-grade specification is verified across the full –40°C to +125°C operating range, with total deviation limited to ±31 mV.
How does TLVH432QDBZR differ from TLVH431QDBZR in pin configuration?
The TLVH432QDBZR uses REF–CATHODE–ANODE pinout in SOT-23-3, whereas TLVH431QDBZR uses CATHODE–ANODE–REF. This reversal optimizes feedback routing in optocoupler-coupled flyback designs. The TLVH432QDBZR is not pin-compatible with TLVH431QDBZR without PCB layout changes.
Can TLVH432QDBZR operate with less than 1.24 V cathode-to-anode voltage?
No. TLVH432QDBZR requires a minimum cathode-to-anode voltage (VKA) of 1.24 V to enter regulation. Below this headroom, the device remains in cutoff with cathode current <0.1 μA. For sub-1.24 V references, consider dedicated low-voltage references like REF3012.
What is the minimum cathode current required for regulation in TLVH432QDBZR?
The TLVH432QDBZR requires a minimum cathode current (IK(min)) of 100 μA at 25°C to maintain regulation. This increases to 120 μA at +125°C per Figure 5-5. Supplying less current results in degraded gain, increased output impedance, and loss of reference accuracy.
Is an external capacitor required for stability when using TLVH432QDBZR?
No. The TLVH432QDBZR is internally compensated and stable without an external capacitor between cathode and anode. However, if a capacitive load is added (e.g., for noise filtering), Figures 5-15 to 5-17 in the datasheet provide phase margin guidance for selecting ≤10 nF ceramic capacitors at common operating voltages.
TLVH432QDBZR 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
TLVH432QDBZR FAQ
1.How can I place an order for TLVH432QDBZR through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH432QDBZR 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 TLVH432QDBZR reliable?
The price and inventory of TLVH432QDBZR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH432QDBZR is usually 5 days.
3.What payment methods are accepted for TLVH432QDBZR?
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4.How is shipping managed for TLVH432QDBZR?
TLVH432QDBZR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH432QDBZR 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 TLVH432QDBZR?
For technical support, including TLVH432QDBZR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH432QDBZR requirements.
6.How does Aetrix verify that TLVH432QDBZR is sourced from the original manufacturer or authorized distributors?
All TLVH432QDBZR 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 TLVH432QDBZR meets industry standards.
7.What is the process for return or replacement of TLVH432QDBZR?
All TLVH432QDBZR units undergo pre-shipment inspection (PSI). If there is an issue with TLVH432QDBZR, 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 TLVH432QDBZR part is unused and in its original packaging.
Return procedure for TLVH432QDBZR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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