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Nexperia USA Inc. TLVH431NQDBZR-QR
- Part No.:
- TLVH431NQDBZR-QR
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TLVH431NQDBZR-QR.pdf
- Description:
- IC VREF SHUNT 1.24V SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
TLVH431NQDBZR-Q from Nexperia is a three-terminal adjustable precision shunt regulator with 1.5 % reference voltage tolerance, -40 °C to 125 °C operating temperature range, and SOT23 package. It sets output voltage from 1.24 V to 14 V via two external resistors, delivers 0.08–70 mA sink current, and features 0.1 Ω typical dynamic cathode-anode impedance for stable regulation in automotive SMPS feedback loops.
For engineers reviewing the TLVH431NQDBZR-Q datasheet, TLVH431NQDBZR-Q pinout, TLVH431NQDBZR-Q application, or TLVH431NQDBZR-Q equivalent, key selection criteria include its AEC-Q100 Grade 1 qualification, mirrored pinning configuration (K-REF-A), low 0.19–0.30 μA reference current, and thermal stability across extended automotive temperature ranges.
Technical Context
The TLVH431NQDBZR-Q implements a bandgap-based reference core with active output circuitry enabling sharp turn-on characteristics and low output impedance. Its functional diagram shows REF, K (cathode), and A (anode) terminals forming a shunt path where cathode current is regulated by reference voltage error amplification.
It operates as a programmable shunt element requiring no external bias supply - reference current flows only through the REF pin, while load current passes between cathode and anode. The device maintains regulation over VKA = Vref to 14 V with ΔVref/ΔVKA as low as -0.8 mV/V, supporting precise voltage setting in isolated feedback and current-sink topologies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference voltage (Vref) | 1222–1258 mV at 25 °C; defines minimum regulation threshold and sets output via R1/R2 divider |
| Cathode current range (IK) | 0.08–70 mA; determines maximum shunt power handling and compatible load current capability |
| Dynamic cathode-anode impedance (ZKA) | 0.10–0.15 Ω below 1 kHz; ensures minimal output voltage deviation under dynamic load transients |
| Reference current (Iref) | 0.19–0.30 μA typical; enables high-resistance feedback networks without significant current error |
| Temperature range | -40 °C to +125 °C; qualified for under-hood automotive environments and industrial power systems |
| Reference tolerance | ±1.5 %; specifies initial accuracy of Vref before temperature and line variation effects |
| ESD rating (HBM) | 4 kV; supports robust handling during PCB assembly and system integration |
Pinout & Package
SOT23 (TO-236AB) surface-mount plastic package with 3 leads; 2.8 mm × 1.4 mm footprint, 1.1 mm height, and standard reflow-compatible solder pads per Figure 30.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (K) | Cathode | Main current sink terminal; connects to regulated output node or SMPS optocoupler anode |
| 2 (REF) | Reference input | Sense point for feedback divider; draws sub-μA current enabling high-impedance resistor networks |
| 3 (A) | Anode | Return path for cathode current; ties to ground or low-side return in shunt configurations |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage range | 1.24 V to 14 V set by two external resistors - eliminates need for multiple fixed-voltage regulators |
| Low dynamic output impedance | 0.1 Ω typical - minimizes output voltage droop during fast load steps in precision current sinks |
| AEC-Q100 Grade 1 qualification | Qualified from -40 °C to +125 °C - validated for engine control units, body electronics, and ADAS power rails |
| Mirrored pinning (K-REF-A) | Pin 1 = K, Pin 2 = REF, Pin 3 = A - matches layout conventions for compact feedback routing in isolated SMPS designs |
| Low reference current | 0.19–0.30 μA - reduces power loss in high-resistance dividers and improves accuracy at light loads |
Applications
| Automotive SMPS Feedback | Precision Current Sink |
|---|---|
|
Use Scenario: Isolated DC-DC converter in engine control module using optocoupler feedback. IC Role / Device Role / Timing Role: Shunt regulator on secondary side providing stable 2.5 V reference to optocoupler LED driver. Use Value: Enables accurate output voltage regulation despite primary-side transformer variation and load transients. |
Use Scenario: Constant-current bias for automotive LED headlamp driver IC. IC Role / Device Role / Timing Role: Precision shunt element defining 120 mA sink current via 10.2 Ω sense resistor. Use Value: Maintains ±1.5 % current accuracy across -40 °C to +125 °C ambient, eliminating thermal drift compensation. |
| On-Board Voltage Regulation | Programmable Overvoltage Clamp |
|
Use Scenario: Local 5.0 V rail regulation for infotainment MCU supply in vehicle infotainment head unit. IC Role / Device Role / Timing Role: Adjustable shunt regulator replacing Zener diode with tighter tolerance and lower impedance. Use Value: Reduces output ripple by 40 % versus 5.1 V Zener due to 0.1 Ω ZKA and sharp turn-on characteristic. |
Use Scenario: Protection circuit limiting battery management system (BMS) cell voltage to 4.3 V. IC Role / Device Role / Timing Role: Programmable clamp activated when cell voltage exceeds set threshold via resistor divider. Use Value: Provides repeatable 4.3 V trip point with <10 mV temperature drift over full automotive range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431NAQDBZR-Q | 1.0 % reference tolerance vs. 1.5 %; otherwise identical pinout, temp range, and specs | Required where tighter initial Vref accuracy is needed for high-precision feedback or calibration-critical systems | Select when ±10 mV Vref error budget is insufficient; adds cost but no layout change |
| TLVH431NIDBZR-Q | Same 1.5 % tolerance but rated for -40 °C to +85 °C (not +125 °C); identical SOT23 normal pinning | Suitable for cabin electronics or non-under-hood modules where extended temperature is not required | Choose for cost-sensitive commercial-grade applications with lower thermal stress |
Compared with TLVH431NQDBZR-Q, the A-grade variant offers tighter Vref accuracy without sacrificing temperature range, while the I-grade version trades thermal capability for lower cost in less demanding environments - both retain identical SOT23 mounting and electrical interface.
Availability
TLVH431NQDBZR-Q is available at Aetrix Electronics and suitable for automotive power conversion, precision current control, and on-board voltage regulation requiring stable component supply across extended temperature profiles and AEC-Q100 compliance.
Supply support for TLVH431NQDBZR-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 leading semiconductor manufacturer headquartered in Nijmegen, Netherlands, specializing in high-volume logic, analog, and discrete components with strong automotive focus.
The TLVH431N-Q family targets automotive-grade precision voltage regulation, designed specifically to replace Zener diodes in safety-critical power supplies, SMPS feedback, and current-limiting circuits where AEC-Q100 qualification and thermal stability are mandatory.
FAQ
What is the pin configuration of TLVH431NQDBZR-Q?
TLVH431NQDBZR-Q uses mirrored pinning in SOT23: Pin 1 is Cathode (K), Pin 2 is Reference (REF), and Pin 3 is Anode (A). This differs from normal-pinning variants (e.g., TLVH431NCDBZR-Q) where Pin 1 is REF. Layout must match this K-REF-A order to ensure correct feedback connection and regulation.
Can TLVH431NQDBZR-Q be used in isolated feedback loops?
Yes - it is explicitly recommended for isolated feedback in Switch Mode Power Supplies (SMPS), as shown in Figure 28 of the datasheet. Its low reference current (≤0.3 μA) minimizes optocoupler LED drive error, and its 0.1 Ω dynamic impedance ensures tight secondary-side voltage regulation despite primary-side variations.
What is the minimum cathode current required for regulation?
The minimum cathode current (IK(min)) is 55 μA at Vref, per Table 10. Below this, the device exits regulation and behaves as an open circuit. Designers must ensure external circuitry provides ≥55 μA under all operating conditions, including light-load and startup scenarios, to maintain stable output voltage.
How does TLVH431NQDBZR-Q handle capacitive loads?
Stability depends on load capacitance and ESR: Figure 20 shows stable operation up to ~60 nF at 25 °C with 150 Ω series resistance. For higher capacitance or wider temperature ranges, verify phase margin using test circuits in Figures 21–22. Exceeding stability boundaries causes oscillation or regulation failure.
TLVH431NQDBZR-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:
- ±1.5%
- 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
TLVH431NQDBZR-QR FAQ
1.How can I place an order for TLVH431NQDBZR-QR through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH431NQDBZR-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 TLVH431NQDBZR-QR reliable?
The price and inventory of TLVH431NQDBZR-QR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431NQDBZR-QR is usually 5 days.
3.What payment methods are accepted for TLVH431NQDBZR-QR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH431NQDBZR-QR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLVH431NQDBZR-QR?
TLVH431NQDBZR-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH431NQDBZR-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 TLVH431NQDBZR-QR?
For technical support, including TLVH431NQDBZR-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431NQDBZR-QR requirements.
6.How does Aetrix verify that TLVH431NQDBZR-QR is sourced from the original manufacturer or authorized distributors?
All TLVH431NQDBZR-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 TLVH431NQDBZR-QR meets industry standards.
7.What is the process for return or replacement of TLVH431NQDBZR-QR?
All TLVH431NQDBZR-QR units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431NQDBZR-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 TLVH431NQDBZR-QR part is unused and in its original packaging.
Return procedure for TLVH431NQDBZR-QR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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