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Nexperia USA Inc. TLVH431NAQDBZR-QR
- Part No.:
- TLVH431NAQDBZR-QR
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TLVH431NAQDBZR-QR.pdf
- Description:
- IC VREF SHUNT 1.24V SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,751
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Product details
Overview
TLVH431NAQDBZR-Q from Nexperia is an A-grade adjustable precision shunt regulator in SOT23 package, featuring 1.0 % reference voltage tolerance (1228–1252 mV at 25 °C), 0.1 Ω typical dynamic cathode-anode impedance, and sink current capability from 0.08 mA to 70 mA. It operates across –40 °C to +125 °C and is qualified per AEC-Q100 Grade 1 for automotive feedback loops.
For engineers reviewing the TLVH431NAQDBZR-Q datasheet, TLVH431NAQDBZR-Q pinout, TLVH431NAQDBZR-Q application, or TLVH431NAQDBZR-Q equivalent, this device serves as a low-noise, high-stability replacement for Zener diodes in isolated SMPS feedback, precision current sinking, and on-board voltage regulation where tight Vref tolerance and thermal stability are critical.
Technical Context
The TLVH431NAQDBZR-Q implements a three-terminal shunt topology with internal bandgap reference and error amplifier, enabling programmable output voltage from 1.24 V to 14 V via two external resistors. Its sharp turn-on characteristic and low 0.1 Ω dynamic impedance support stable regulation under varying load and line conditions.
Designed for automotive use, it delivers 1.0 % initial Vref accuracy and maintains < ±2.2 mV reference drift over –40 °C to +125 °C. The device draws only 0.19–0.30 μA reference current and exhibits < 0.05 μA off-state current at 14 V cathode-anode voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Vref tolerance | ±1.0 % (1228–1252 mV @ 25 °C, IK = 10 mA) - ensures precise setpoint accuracy for closed-loop feedback systems |
| Operating temperature | –40 °C to +125 °C - supports under-hood automotive environments without derating |
| ZKA (dynamic impedance) | 0.10–0.15 Ω @ f < 1 kHz - provides low-impedance regulation for fast transient response |
| Sink current range | 0.08 mA to 70 mA - enables direct drive of optocoupler LEDs or series pass transistors |
| Iref (reference current) | 0.19–0.30 μA @ R1 = 10 kΩ - minimizes resistor power loss and improves efficiency in high-impedance divider networks |
| AEC-Q100 qualification | Grade 1 (–40 °C to +125 °C) - certified for automotive powertrain and body electronics applications |
| Package | SOT23 (TO-236AB) - surface-mount compatible with standard reflow profiles and space-constrained PCB layouts |
Pinout & Package
SOT23 plastic surface-mounted package (TO-236AB), 3-lead, normal pinning configuration (REF–K–A).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (REF) | Reference input | High-impedance node connected to external resistor divider; sets regulated output voltage via VOUT = Vref × (1 + R1/R2) |
| 2 (K) | Cathode | Current-sink terminal; connects to regulated output node or optocoupler anode in isolated SMPS feedback |
| 3 (A) | Anode | Return path to ground or system common; completes shunt current loop and defines cathode-anode voltage (VKA) |
Key Features
| Feature | Design Value |
|---|---|
| Programmable output voltage | 1.24 V to 14 V using two external resistors - eliminates need for multiple fixed-voltage regulators |
| A-grade reference tolerance | ±1.0 % at 25 °C - reduces calibration overhead in automotive sensor supply and battery monitoring circuits |
| Low output noise & impedance | 0.1 Ω typical ZKA and low µV/√Hz noise - prevents feedback loop instability in high-gain isolated converters |
| Automotive qualification | AEC-Q100 Grade 1 - guarantees reliability for 15-year service life in engine control units and ADAS modules |
| Minimal reference current | 0.19–0.30 μA - allows use of MΩ-range divider resistors, reducing power consumption in always-on systems |
Applications
| Isolated SMPS Feedback | Precision Current Sink |
|---|---|
Use Scenario: Secondary-side voltage sensing in flyback or forward converters with optocoupler-based isolation. IC Role / Device Role / Timing Role: Shunt regulator providing stable reference to optocoupler LED, enabling accurate primary-side duty cycle adjustment. Use Value: 1.0 % Vref tolerance and low ZKA ensure ±1 % output voltage regulation across temperature and line variations. |
Use Scenario: Constant-current biasing of laser diodes or LED strings in automotive lighting modules. IC Role / Device Role / Timing Role: Precision shunt element setting current through external sense resistor (ISINK = Vref / RS). Use Value: Sub-µA Iref and < ±2.2 mV ΔVref over –40 °C to +125 °C maintain current accuracy within ±1.5 % across full operating range. |
| On-Board Voltage Regulation | Adjustable Series Pass Regulator |
Use Scenario: Local 3.3 V or 5 V regulation from higher intermediate bus (e.g., 12 V battery rail) in infotainment head units. IC Role / Device Role / Timing Role: Shunt regulator controlling base/gate of external PNP or PMOS pass transistor. Use Value: Sharp turn-on and 70 mA sink capability enable fast response to load transients while maintaining < 10 mV droop. |
Use Scenario: Programmable output voltage supply for microcontroller I/O banks or analog sensor excitation. IC Role / Device Role / Timing Role: Adjustable reference driving series pass element (NPN/PNP or NMOS/PMOS) with external feedback divider. Use Value: 1.24–14 V programmability and 0.08 mA minimum IK allow operation down to ultra-low quiescent currents (< 100 µA total). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431NQDBZR-Q | Standard grade (±1.5 % Vref tolerance); same pinout, package, and temperature range (–40 °C to +125 °C) | Higher Vref drift (±10 mV over temp) limits use in high-accuracy feedback or current sinking | Select when cost sensitivity outweighs need for ±1 % output regulation stability |
| TL431ACDBVR | Texas Instruments part; ±1.0 % Vref, SO-8 package, wider –40 °C to +125 °C range but higher 0.5 Ω ZKA and 3 µA Iref | Larger footprint and higher reference current increase PCB area and power loss in high-resistance dividers | Choose only if SO-8 layout compatibility or TI ecosystem alignment is required |
Compared with TLVH431NQDBZR-Q, the TLVH431NAQDBZR-Q delivers tighter Vref accuracy and lower thermal drift for automotive feedback loops; versus TL431ACDBVR, it offers superior dynamic impedance and lower reference current in a smaller SOT23 footprint-critical for space- and efficiency-constrained designs.
Availability
TLVH431NAQDBZR-Q is available at Aetrix Electronics and suitable for automotive powertrain control, isolated DC-DC converter feedback, and precision current regulation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TLVH431NAQDBZR-Q 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
Nexperia is a global semiconductor expert delivering high-performance logic, discrete, and MOSFET solutions optimized for automotive, industrial, and consumer applications.
The TLVH431N-Q family targets automotive-grade precision voltage regulation, designed specifically to replace Zener diodes in AEC-Q100-compliant feedback, current limiting, and shunt control circuits.
FAQ
What is the minimum cathode current required for regulation?
The TLVH431NAQDBZR-Q requires a minimum cathode current (IK(min)) of 55 µA to maintain regulation, verified across –40 °C to +125 °C. This value ensures stable operation even with high-value feedback resistors and low-power optocouplers commonly used in automotive SMPS designs.
Can TLVH431NAQDBZR-Q be used in place of a Zener diode?
Yes-it replaces Zener diodes in applications requiring better than ±5 % voltage tolerance. With ±1.0 % Vref accuracy, low 0.1 Ω impedance, and sharp turn-on, it delivers superior regulation stability, especially under varying temperature and load conditions where Zeners exhibit significant drift and impedance variation.
Does this device require an external capacitor for stability?
Stability depends on load capacitance and ESR. Figure 20 shows stable operation with CL ≥ 1 nF for IK ≥ 10 mA at 25 °C, but design verification is required across full temperature and current ranges. A 1–10 nF ceramic capacitor placed close to the device improves phase margin in high-frequency feedback loops.
How does the mirrored vs. normal pinning affect PCB layout?
TLVH431NAQDBZR-Q uses normal pinning (REF–K–A), matching standard SOT23 footprints. Mirrored variants (e.g., TLVH431NAMQDBZR-Q) swap REF and K pins-using the wrong variant causes functional failure. Always verify marking code "8T%" and pin 1 orientation before layout or assembly.
TLVH431NAQDBZR-QR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- 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):
- 14 V
- Current - Output:
- 70 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 80 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
TLVH431NAQDBZR-QR FAQ
1.How can I place an order for TLVH431NAQDBZR-QR through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH431NAQDBZR-QR 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 TLVH431NAQDBZR-QR reliable?
The price and inventory of TLVH431NAQDBZR-QR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431NAQDBZR-QR is usually 5 days.
3.What payment methods are accepted for TLVH431NAQDBZR-QR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH431NAQDBZR-QR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLVH431NAQDBZR-QR?
TLVH431NAQDBZR-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH431NAQDBZR-QR 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 TLVH431NAQDBZR-QR?
For technical support, including TLVH431NAQDBZR-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431NAQDBZR-QR requirements.
6.How does Aetrix verify that TLVH431NAQDBZR-QR is sourced from the original manufacturer or authorized distributors?
All TLVH431NAQDBZR-QR 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 TLVH431NAQDBZR-QR meets industry standards.
7.What is the process for return or replacement of TLVH431NAQDBZR-QR?
All TLVH431NAQDBZR-QR units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431NAQDBZR-QR, 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 TLVH431NAQDBZR-QR part is unused and in its original packaging.
Return procedure for TLVH431NAQDBZR-QR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH431NAQDBZR-QR Tags
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TL431AIDBZR
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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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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
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AZ431LANTR-G1
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