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Texas Instruments TLVH431AQDBVRQ1
- Part No.:
- TLVH431AQDBVRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TLVH431AQDBVRQ1.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:6,083
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Product details
Overview
TLVH431AQDBVRQ1 from Texas Instruments is an A-grade automotive-qualified adjustable precision shunt voltage reference with 1% initial tolerance at 25°C, 1.24 V nominal reference voltage, and operation down to 1.24 V cathode-anode voltage. It delivers stable regulation across –40°C to 125°C, supports 100 μA–70 mA cathode current, and features 0.25 Ω typical dynamic impedance-enabling accurate feedback in isolated 3.3-V flyback power supplies.
For engineers reviewing the TLVH431AQDBVRQ1 datasheet, TLVH431AQDBVRQ1 pinout, TLVH431AQDBVRQ1 application, or TLVH431AQDBVRQ1 equivalent, key selection criteria include its A-grade 1% VREF tolerance, SOT-23-5 (DBV) automotive package, low-voltage capability below 2 V, and verified use with optocouplers in safety-critical automotive power regulation.
Technical Context
The TLVH431AQDBVRQ1 implements a precision bandgap reference core with active output circuitry that enables sharp turn-on and low-output-impedance regulation. Its internal architecture supports two-resistor external programming of output voltage from VREF (1.24 V) up to 18 V while maintaining thermal stability over the full automotive temperature range.
It operates as a 3-terminal shunt regulator where the reference terminal senses voltage via external resistive dividers, the cathode sinks current to maintain regulation, and the anode serves as the common return path. The device exhibits <0.5 μA reference input current and maintains regulation with as little as 100 μA cathode current-critical for low-power automotive subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF @ 25°C | 1.24 V ±1% - sets minimum programmable output and defines accuracy baseline for feedback loop design |
| VREF Deviation (–40°C to 125°C) | ±31 mV - ensures stable reference under engine bay thermal cycling without recalibration |
| Cathode Current Range | 100 μA to 70 mA - supports both ultra-low-power standby modes and full-load regulation in 3.3-V SMPS |
| Dynamic Impedance | 0.25 Ω typical - minimizes output voltage perturbation during load transients in closed-loop feedback |
| Min Cathode Voltage (VKA) | 1.24 V - enables direct use in sub-2-V systems where legacy TL431 cannot operate |
| Reference Input Current | 0.1–0.5 μA - reduces divider network power loss and improves high-side resistor selection flexibility |
| Absolute Max Cathode Voltage | 20 V - allows safe operation with 12-V automotive rails plus transient margin |
Pinout & Package
SOT-23-5 (DBV) package: 1.45 mm max height, 3.05 mm × 1.75 mm footprint, lead-free NIPDAU/SN finish, MSL Level-1, tape-and-reel (3000 pcs/reel), pin 1 quadrant Q3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Anode) | Current return path | Common ground node for cathode current sink and reference divider; must connect to system GND or lowest potential point |
| Pin 2 (Cathode) | Regulated current sink | Primary output node-connects to optocoupler LED anode or series pass element base/gate in shunt-controlled topologies |
| Pin 3 (NC) | No connection | Internally unconnected; must remain floating-no PCB trace or thermal pad tie |
| Pin 4 (Ref) | Voltage sense input | High-impedance node monitoring feedback divider; connects to midpoint of R1/R2 network for programmable VOUT |
| Pin 5 (Cathode) | Secondary cathode terminal | Parallel cathode path-electrically tied to Pin 2 internally; used for enhanced current handling and thermal dissipation |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 1 (–40°C to 125°C TJ) - certified for engine control, ADAS, and body electronics |
| Low-voltage operation | 1.24 V minimum VKA - enables regulation in 1.8-V and 2.5-V auxiliary rails where TL431 fails |
| Sharp turn-on characteristic | Active output stage with fast response - eliminates Zener soft-start delay in power-up sequencing |
| Low reference current | ≤0.5 μA max Iref - permits use of >1 MΩ feedback dividers, reducing quiescent current by >90% vs. TL431 |
| Stable dynamic impedance | 0.25 Ω typical |zKA| - maintains loop gain integrity across 0.1–70 mA cathode load range |
Applications
| Automotive Engine Control Unit (ECU) Power Monitoring | Isolated 3.3-V Flyback Converter Feedback |
|---|---|
Use Scenario: Real-time monitoring of 5-V and 12-V rail integrity in engine management systems under wide thermal and load variation. IC Role / Device Role / Timing Role: Precision shunt reference providing stable 1.24-V基准 for ADC input scaling and comparator thresholds. Use Value: 1% VREF tolerance and ±31 mV temp drift ensure consistent fault detection thresholds across –40°C to 125°C ambient. | Use Scenario: Secondary-side voltage regulation in isolated DC/DC converters powering infotainment and telematics modules. IC Role / Device Role / Timing Role: Adjustable shunt reference + error amplifier driving optocoupler LED to close feedback loop across isolation barrier. Use Value: 0.25 Ω dynamic impedance and 100 μA min IK enable fast transient response and stable regulation at light loads (<1 mA). |
| On-Board Charger (OBC) Auxiliary Supply | ADAS Camera Module Bias Regulation |
Use Scenario: Generating tightly regulated 3.3-V bias for microcontrollers and gate drivers in bidirectional OBC auxiliary power stages. IC Role / Device Role / Timing Role: Programmable shunt reference setting output voltage via external R1/R2 network, interfaced with TLVH431AQDBVRQ1's Ref and Cathode pins. Use Value: Adjustable 1.24–18 V output range and 70 mA cathode current support full-load operation without external pass transistor. | Use Scenario: Providing stable 2.8-V bias for CMOS image sensor analog front-end in automotive surround-view cameras. IC Role / Device Role / Timing Role: Low-noise shunt reference establishing precise reference voltage for LDO feedback and sensor biasing networks. Use Value: Sub-μA reference current and low 1/f noise profile minimize supply-induced image artifacts in low-light conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431BQDBVRQ1 | 0.5% VREF tolerance at 25°C vs. 1% for TLVH431AQDBVRQ1; otherwise identical electrical specs and packaging | Preferred where tighter initial accuracy is required for high-precision feedback loops (e.g., battery management reference) | Select TLVH431BQDBVRQ1 when system-level calibration budget demands <0.5% reference error at room temperature |
| TL431ACDR | Higher 2.495 V nominal VREF; requires ≥2.5 V cathode voltage; no automotive qualification; wider temp range (0°C–70°C only) | Cost-sensitive non-automotive applications where 2.5-V reference suffices and AEC-Q100 is not mandated | Choose TL431ACDR only for industrial or consumer designs lacking automotive reliability or low-voltage requirements |
Compared with TLVH431BQDBVRQ1, TLVH431AQDBVRQ1 trades 0.5% initial accuracy for lower cost and sufficient performance in ECU power monitors and flyback feedback where system calibration absorbs initial tolerance. Versus TL431ACDR, TLVH431AQDBVRQ1 enables sub-2-V operation and meets AEC-Q100 Grade 1-making it the sole viable option for modern automotive 3.3-V isolated supplies.
Availability
TLVH431AQDBVRQ1 is available at Aetrix Electronics and suitable for automotive power monitoring, isolated flyback converter feedback, and on-board charger auxiliary supply requiring stable component supply across extended temperature and long product lifecycles.
Supply support for TLVH431AQDBVRQ1 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 delivering analog, embedded processing, and connectivity solutions with deep automotive and industrial domain expertise.
The TLVH431-Q1 product line was designed specifically for automotive power regulation-delivering low-voltage shunt reference capability, AEC-Q100 qualification, and robust thermal performance in engine control, ADAS, and body electronics systems.
FAQ
What is the reference voltage tolerance of TLVH431AQDBVRQ1 at 25°C?
The TLVH431AQDBVRQ1 has a reference voltage tolerance of ±1% at 25°C, corresponding to a 1.24 V nominal VREF ranging from 1.228 V to 1.252 V. This A-grade specification is confirmed in the SLVS906B datasheet Section 5 (TLVH431A Electrical Characteristics) and applies strictly to the TLVH431AQDBVRQ1 orderable part number. The tolerance remains valid across the full –40°C to 125°C operating range with a maximum deviation of ±31 mV.
Can TLVH431AQDBVRQ1 replace TL431 in existing designs?
TLVH431AQDBVRQ1 can replace TL431 only in designs where cathode voltage is ≥1.24 V and automotive qualification is required. Unlike TL431 (2.495 V VREF, min 2.5 V VKA), TLVH431AQDBVRQ1 operates down to 1.24 V, enabling use in 1.8-V and 2.5-V systems. However, pin compatibility is not guaranteed: TLVH431AQDBVRQ1 uses SOT-23-5 (DBV) with NC and dual cathode pins, while TL431 uses TO-92 or SOIC-8. Layout changes and resistor recalculations are required.
What is the function of Pin 3 (NC) on TLVH431AQDBVRQ1?
Pin 3 on TLVH431AQDBVRQ1 is a no-connect (NC) terminal-internally unconnected and electrically isolated from all active circuitry. Per TI's DBV package drawing and datasheet pinout diagrams, this pin must remain floating with no PCB trace, solder mask opening, or thermal pad connection. Connecting Pin 3 risks parasitic coupling or latch-up; TI explicitly states it "must not be connected to any signal or power net" in application notes.
Does TLVH431AQDBVRQ1 support operation with optocouplers in isolated feedback circuits?
Yes, TLVH431AQDBVRQ1 is explicitly validated for optocoupler-based isolated feedback, as shown in Figure 21 of the SLVS906B datasheet. It drives the LED anode of industry-standard optocouplers (e.g., PC817, TLP185) with its cathode terminals, enabling precise 3.3-V output regulation in flyback converters. Its 0.25 Ω dynamic impedance and 100 μA–70 mA cathode current range ensure stable loop gain and fast transient response across load conditions.
What is the maximum cathode current rating for TLVH431AQDBVRQ1?
The absolute maximum cathode current for TLVH431AQDBVRQ1 is 80 mA, per the Absolute Maximum Ratings table in SLVS906B. However, the recommended continuous operating range is 0.1 mA to 70 mA. Exceeding 70 mA risks exceeding the 150°C junction temperature limit due to power dissipation (PD = VKA × IK), especially at elevated ambient temperatures. Derating is required above 70°C ambient per the θJA = 206°C/W thermal resistance.
TLVH431AQDBVRQ1 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:
- ±1%
- 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
TLVH431AQDBVRQ1 FAQ
1.How can I place an order for TLVH431AQDBVRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH431AQDBVRQ1 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 TLVH431AQDBVRQ1 reliable?
The price and inventory of TLVH431AQDBVRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431AQDBVRQ1 is usually 5 days.
3.What payment methods are accepted for TLVH431AQDBVRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH431AQDBVRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLVH431AQDBVRQ1?
TLVH431AQDBVRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH431AQDBVRQ1 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 TLVH431AQDBVRQ1?
For technical support, including TLVH431AQDBVRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431AQDBVRQ1 requirements.
6.How does Aetrix verify that TLVH431AQDBVRQ1 is sourced from the original manufacturer or authorized distributors?
All TLVH431AQDBVRQ1 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 TLVH431AQDBVRQ1 meets industry standards.
7.What is the process for return or replacement of TLVH431AQDBVRQ1?
All TLVH431AQDBVRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431AQDBVRQ1, 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 TLVH431AQDBVRQ1 part is unused and in its original packaging.
Return procedure for TLVH431AQDBVRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH431AQDBVRQ1 Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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LM4040CYM3-2.5-TR
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LM4040EIM3-2.5/NOPB
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AZ431LBNTR-G1
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
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AZ431LANTR-G1
Diodes Incorporated
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