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Texas Instruments TLVH431BQDBVRQ1
- Part No.:
- TLVH431BQDBVRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TLVH431BQDBVRQ1.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,713
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Product details
Overview
TLVH431BQDBVRQ1 from Texas Instruments is an AEC-Q100 qualified automotive-grade adjustable shunt voltage reference IC with 0.5% initial reference voltage tolerance (1.24 V), 100 μA to 70 mA cathode current range, 0.25 Ω typical dynamic impedance, and operation from –40°C to 125°C. It serves as a precision feedback element in isolated DC-DC converters, replacing low-voltage Zener diodes in on-board regulation and 3.3-V SMPS designs.
For engineers reviewing the TLVH431BQDBVRQ1 datasheet, TLVH431BQDBVRQ1 pinout, TLVH431BQDBVRQ1 application, or TLVH431BQDBVRQ1 equivalent, key selection criteria include its 1.24 V minimum operating voltage, tight 0.5% VREF tolerance at 25°C, SOT-23-5 package compatibility with optocoupler-based feedback loops, and automotive temperature qualification.
Technical Context
The TLVH431BQDBVRQ1 implements a precision bandgap reference core with active output circuitry enabling sharp turn-on characteristics and low-output-impedance regulation down to 1.24 V. Its three-terminal architecture (anode, cathode, reference) supports adjustable output voltages from VREF to 18 V using two external resistors.
It features thermal stability over –40°C to 125°C, 11 mV max VREF deviation across temperature, and –1.5 to –2.7 mV/V cathode voltage sensitivity - critical for stable feedback in automotive power supplies where input transients and thermal cycling occur.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF @ 25°C | 1.24 V ±0.5% - enables precise setpoint accuracy for feedback networks in low-voltage SMPS |
| VREF Deviation (–40°C to 125°C) | ±11 mV - ensures stable regulation across full automotive temperature range without recalibration |
| Cathode Current Range | 100 μA to 70 mA - supports operation from light-load standby to full-power regulation in flyback controllers |
| Dynamic Impedance | 0.25 Ω typical - provides low-noise, high-stability reference output under varying load conditions |
| Min Operating Voltage | 1.24 V - allows use in 3-V and 3.3-V systems where legacy TL431 cannot operate |
| Reference Terminal Current | 0.1–0.5 μA - minimizes resistor-divider loading error and improves output voltage accuracy |
| AEC-Q100 Grade | Grade 1 (–40°C to 125°C) - certified for engine control, ADAS, and body electronics applications |
Pinout & Package
SOT-23-5 (DBV) package: 2.9 mm × 1.6 mm × 1.45 mm, surface-mount, RoHS-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Anode) | Current sink return path | Completes shunt regulator loop; connects to system ground or low-side return in feedback topology |
| Pin 2 (Cathode) | Regulated output node | Delivers controlled current to optocoupler LED or external load; voltage set by R1/R2 divider |
| Pin 3 (NC) | No connect | Internally unused; must be left floating or tied to GND per layout guidelines - no electrical function |
| Pin 4 (Reference) | Feedback sense input | Compares divided output voltage against internal 1.24 V reference; determines regulation point |
| Pin 5 (Cathode) | Duplicate cathode terminal | Provides second cathode connection for improved current handling and thermal performance in high-current layouts |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 1 - validated for deployment in safety-critical vehicle subsystems without derating |
| Low-voltage operation | 1.24 V minimum cathode-anode voltage - enables direct use in 3.3-V rail systems without auxiliary biasing |
| Sharp turn-on characteristic | Active output stage with fast response - reduces regulation delay and improves transient immunity in feedback loops |
| Low dynamic impedance | 0.25 Ω typical - suppresses ripple propagation into feedback path, enhancing PSRR in isolated supplies |
| Wide cathode current range | 100 μA–70 mA - accommodates both ultra-low-power standby modes and full-load regulation in compact converters |
Applications
| Isolated Flyback Converter | On-Board Point-of-Load Regulator |
|---|---|
Use Scenario: 3.3-V output flyback supply with optocoupler-based secondary-side feedback in automotive infotainment head unit. IC Role / Device Role / Timing Role: Precision shunt reference and error amplifier in secondary-side feedback loop. Use Value: Enables regulated output as low as 2.7 Vdc while maintaining <±1% total output variation across line, load, and temperature. |
Use Scenario: Local 5-V to 3.3-V step-down regulator with external pass transistor in ADAS camera ECU. IC Role / Device Role / Timing Role: Adjustable voltage reference setting base drive of PNP pass transistor. Use Value: Replaces discrete Zener + transistor solution with 50% smaller footprint and 0.5% tighter output tolerance. |
| Battery Management System Reference | Industrial Sensor Signal Conditioning |
Use Scenario: Cell voltage monitoring circuit in 12-V lead-acid battery supervisor module. IC Role / Device Role / Timing Role: Stable 1.24-V reference for ADC input scaling and comparator threshold generation. Use Value: Maintains <10 ppm/°C effective TC over –40°C to 125°C, eliminating need for software calibration. |
Use Scenario: 4–20 mA transmitter front-end with ratiometric sensor excitation in factory automation I/O module. IC Role / Device Role / Timing Role: Precision reference for DAC-controlled current source and analog signal chain biasing. Use Value: Delivers 0.1% absolute accuracy over temperature, enabling single-point calibration for full 20-year product lifecycle. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431AQDBVRQ1 | 1% VREF tolerance at 25°C vs. 0.5% for TLVH431BQDBVRQ1; otherwise identical specs and pinout | Suitable for cost-sensitive non-safety-critical modules where ±1% output accuracy is acceptable | Select TLVH431AQDBVRQ1 when B-grade precision is unnecessary and BOM cost reduction is prioritized |
| TLVH431BQDBZRQ1 | SOT-23-3 (DBZ) package with no NC pin; same electrical specs but reduced thermal mass and layout flexibility | Preferred for space-constrained PCBs where 5-pin routing is impractical and cathode current ≤50 mA | Choose TLVH431BQDBZRQ1 only if board area is critical and dual-cathode thermal advantage is not required |
Compared with TLVH431AQDBVRQ1, the TLVH431BQDBVRQ1 delivers tighter initial accuracy for higher-system precision; compared with TLVH431BQDBZRQ1, it offers superior thermal performance and noise immunity via dual cathode terminals - critical for high-reliability automotive feedback paths.
Availability
TLVH431BQDBVRQ1 is available at Aetrix Electronics and suitable for automotive power management, isolated DC-DC converter design, and precision analog reference applications requiring stable component supply across extended temperature ranges.
Supply support for TLVH431BQDBVRQ1 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 leader specializing in analog, embedded processing, and automotive ICs, with decades of expertise in precision reference and power management technologies.
The TLVH431B-Q1 product line was designed specifically for automotive-grade isolated feedback circuits, targeting next-generation 3.3-V and low-voltage SMPS in engine control, ADAS, and body electronics.
FAQ
What is the reference voltage tolerance of TLVH431BQDBVRQ1 at 25°C?
The TLVH431BQDBVRQ1 has a reference voltage tolerance of ±0.5% at 25°C, corresponding to a 1.24 V nominal VREF with a min/max range of 1.234 V to 1.246 V. This tight tolerance is specified in the TLVH431B electrical characteristics table and directly impacts output accuracy in feedback networks using the TLVH431BQDBVRQ1.
Does TLVH431BQDBVRQ1 support operation below 3 V?
Yes, TLVH431BQDBVRQ1 operates down to 1.24 V cathode-to-anode voltage, making it fully functional in 3-V and 3.3-V systems where legacy TL431 devices fail to regulate. Its low-voltage capability is confirmed in the "Features" section and "Recommended Operating Conditions" table of the SLVS906B datasheet for TLVH431BQDBVRQ1.
What is the purpose of Pin 3 (NC) on TLVH431BQDBVRQ1?
Pin 3 on TLVH431BQDBVRQ1 is a no-connect terminal - internally unconnected and electrically inactive. Per TI's DBV package documentation and layout guidelines, it must remain unconnected or be tied to ground for mechanical stability; it provides no functional role in the TLVH431BQDBVRQ1 circuit operation.
How does TLVH431BQDBVRQ1 differ from TLVH431AQDBVRQ1?
TLVH431BQDBVRQ1 and TLVH431AQDBVRQ1 share identical package, pinout, temperature range, and dynamic specifications, differing only in initial VREF tolerance: 0.5% for TLVH431BQDBVRQ1 versus 1% for TLVH431AQDBVRQ1. This distinction is explicitly defined in the "Ordering Information" and "Electrical Characteristics" sections of the TLVH431BQDBVRQ1 datasheet.
Can TLVH431BQDBVRQ1 replace a Zener diode in a 3.3-V regulator?
Yes, TLVH431BQDBVRQ1 is explicitly positioned as a superior replacement for low-voltage Zener diodes in on-board regulation. Its active circuitry delivers sharper turn-on, lower dynamic impedance (0.25 Ω vs. >10 Ω for Zeners), and tighter temperature stability - all verified in the "Description" and "Features" sections of the TLVH431BQDBVRQ1 datasheet.
TLVH431BQDBVRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- SC-74A, SOT-753
- 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:
- ±0.5%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 100 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
TLVH431BQDBVRQ1 FAQ
1.How can I place an order for TLVH431BQDBVRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH431BQDBVRQ1 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 TLVH431BQDBVRQ1 reliable?
The price and inventory of TLVH431BQDBVRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431BQDBVRQ1 is usually 5 days.
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4.How is shipping managed for TLVH431BQDBVRQ1?
TLVH431BQDBVRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH431BQDBVRQ1 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 TLVH431BQDBVRQ1?
For technical support, including TLVH431BQDBVRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431BQDBVRQ1 requirements.
6.How does Aetrix verify that TLVH431BQDBVRQ1 is sourced from the original manufacturer or authorized distributors?
All TLVH431BQDBVRQ1 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 TLVH431BQDBVRQ1 meets industry standards.
7.What is the process for return or replacement of TLVH431BQDBVRQ1?
All TLVH431BQDBVRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431BQDBVRQ1, 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 TLVH431BQDBVRQ1 part is unused and in its original packaging.
Return procedure for TLVH431BQDBVRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH431BQDBVRQ1 Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
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LM4040CYM3-2.5-TR
Microchip Technology
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LM4040CYM3-4.1-TR
Microchip Technology
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LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
Texas Instruments
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LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
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LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
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