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Diodes Incorporated TLV431AQFTA
- Part No.:
- TLV431AQFTA
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TLV431AQFTA.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:32,861
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Product details
Overview
TLV431AQFTA from Diodes Incorporated is an AEC-Q100 Grade 1 qualified, adjustable 1.24V shunt voltage reference IC with 1% initial reference voltage tolerance at +25°C, −40°C to +125°C operating temperature range, and 20mA max cathode current capability. It replaces Zener diodes in precision automotive power management circuits requiring stable low-voltage regulation.
For engineers reviewing the TLV431AQFTA datasheet, TLV431AQFTA pinout, TLV431AQFTA application, or TLV431AQFTA equivalent, this part supports high-accuracy feedback loops in DC-DC converters, battery monitoring systems, and automotive sensor supply rails where tight VREF stability and PPAP-compliant sourcing are required.
Technical Context
The TLV431AQFTA operates as a three-terminal shunt regulator with internal bandgap reference and transconductance amplifier. Its output voltage is set externally via resistor divider (R1/R2) between cathode, anode, and reference pins, enabling programmable regulation from 1.24V to 18V.
It features 0.25Ω typical dynamic output impedance, 80µA minimum cathode current for regulation across full temperature range, and ±11mV VREF deviation over −40°C to +125°C - critical for maintaining closed-loop accuracy in engine control units and ADAS power domains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF | 1.24V nominal reference voltage; sets base point for adjustable output (1.24–18V) with 1% tolerance at +25°C |
| Temp Range | −40°C to +125°C operating ambient; qualified for under-hood automotive environments |
| VREF Deviation | ±11mV over −40°C to +125°C; enables <0.9% total reference drift in wide-temp applications |
| Cathode Current | 0–20mA continuous; supports load regulation up to 15mA while maintaining stability |
| Dynamic Impedance | 0.25Ω typical; ensures minimal output voltage perturbation during transient load steps |
| Min Cathode Current | 80µA at +25°C; defines lowest bias needed to sustain regulation without dropout |
| ESD Rating | HBM ±4kV; meets automotive ESD robustness requirements for PCB-level handling |
Pinout & Package
TLV431AQFTA is housed in SOT23-3 package (JEDEC TO-236AB), with lead-free matte tin plating and moisture sensitivity level 1. Pin 1 = Cathode, Pin 2 = Anode, Pin 3 = Reference - all electrically isolated per datasheet pin assignment diagram.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Output node / shunt current sink | Carries regulated current to ground; voltage at this node equals programmed VOUT |
| Anode (Pin 2) | Reference return / common ground path | Provides low-impedance return for reference amplifier; must be connected to system ground or low-noise analog ground |
| Reference (Pin 3) | Feedback input / voltage sense node | Samples divided output voltage; internal comparator adjusts cathode current to maintain 1.24V at this pin |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Output Range | 1.24V to 18V via external R1/R2 divider - eliminates need for multiple fixed references |
| AEC-Q100 Grade 1 Qualification | Validated for automotive use up to +125°C ambient; supports PPAP documentation and IATF 16949 manufacturing |
| Low Reference Drift | ±11mV VREF deviation over −40°C to +125°C - enables <0.9% total error in engine control feedback paths |
| High Accuracy Tolerance | 1% initial VREF tolerance (TLV431AQ variant); reduces calibration overhead in battery management systems |
| Low Dynamic Impedance | 0.25Ω typical ZKA - maintains regulation stability during fast load transients in ADAS camera power supplies |
Applications
| Engine Control Unit (ECU) Power Monitoring | Automotive Camera Module Supply |
|---|---|
|
Use Scenario: Real-time monitoring of 5V/3.3V rail integrity in gasoline/diesel engine ECUs under thermal stress and vibration. IC Role / Device Role / Timing Role: Shunt reference in feedback loop of isolated DC-DC converter supplying microcontroller core voltage. Use Value: 1.24V reference with ±11mV drift ensures <1% total output error across −40°C to +125°C, meeting ISO 16750-4 cold-cranking and hot-soak requirements. |
Use Scenario: Precision voltage setting for image sensor bias and ISP core supply in rear-view and surround-view camera modules. IC Role / Device Role / Timing Role: Adjustable shunt reference establishing stable 2.8V rail for CMOS image sensor analog front-end. Use Value: 0.25Ω dynamic impedance minimizes noise coupling into analog pixel data path during high-frame-rate operation. |
| EV Battery Cell Voltage Sensing | Automotive HVAC Blower Motor Control |
|
Use Scenario: High-side sensing of individual Li-ion cell voltages (3.0–4.2V) in battery management systems with galvanic isolation. IC Role / Device Role / Timing Role: Programmable reference for isolated sigma-delta ADC input scaling network. Use Value: 1% VREF tolerance at +25°C and ±11mV full-range drift enable ≤5mV absolute cell voltage measurement error over lifetime. |
Use Scenario: Feedback reference for PWM-controlled 12V blower motor driver in climate control systems. IC Role / Device Role / Timing Role: Stable 3.3V reference for op-amp comparator comparing sensed motor current against torque command threshold. Use Value: 80µA min cathode current allows reliable regulation even during low-duty-cycle PWM idle states with microamp-level quiescent loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV431BQFTA | 0.5% VREF tolerance at +25°C; same package, temp range, and pinout | Higher accuracy required in safety-critical feedback loops (e.g., airbag deployment power monitors) | Select when tighter initial tolerance justifies cost premium and calibration budget allows |
| TL431CDBVR | Non-automotive grade; 2% VREF tolerance; wider −40°C to +105°C range; SOT23-3 | Cost-sensitive industrial or consumer power supplies without AEC-Q100 requirement | Use only in non-automotive designs where PPAP, Grade 1 qualification, and full −40°C to +125°C validation are not mandated |
Compared with TLV431BQFTA, TLV431AQFTA trades 0.5% initial accuracy for lower cost and broader automotive qualification coverage; versus TL431CDBVR, it delivers AEC-Q100 compliance, tighter drift control, and guaranteed +125°C operation - essential for under-hood reliability.
Availability
TLV431AQFTA is available at Aetrix Electronics and suitable for automotive power management, battery monitoring systems, and ADAS sensor supply rails requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for TLV431AQFTA 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability components for automotive, industrial, and computing markets.
The TLV431Q series is part of Diodes' automotive-qualified analog portfolio, designed specifically for precision voltage reference and feedback applications in AEC-Q100-compliant power systems.
FAQ
What is the minimum cathode current required for regulation at −40°C?
The TLV431AQFTA requires a minimum cathode current of 55µA at −40°C to maintain regulation, rising to 100µA at +125°C per datasheet Electrical Characteristics table. This ensures stable operation across automotive cold-cranking and hot-soak conditions without dropout.
Can TLV431AQFTA replace a standard Zener diode in existing designs?
Yes - TLV431AQFTA can directly replace Zener diodes rated 1.24V–18V by connecting its cathode, anode, and reference pins in place of Zener anode/cathode terminals, using two external resistors to set output voltage. Its superior temperature stability and lower dynamic impedance improve regulation accuracy over Zeners.
Is the SOT23-3 package thermally adequate for 20mA continuous operation?
At TA = +25°C, the SOT23-3 package has θJA = 380°C/W and PDIS = 330mW. With 20mA cathode current and 18V VKA, worst-case power dissipation is 360mW - exceeding rating. Derating is required: max IK at full temp range is 15mA per Recommended Operating Conditions, ensuring safe junction temperature.
Does TLV431AQFTA support reverse-polarity protection in automotive applications?
No - TLV431AQFTA is not designed for reverse-voltage operation. Absolute maximum rating for cathode-to-anode voltage is +20V; applying reverse polarity (anode > cathode) exceeds ratings and may cause permanent damage. External protection circuitry is required for reverse-battery scenarios.
TLV431AQFTA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- 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:
- 15 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-23-3
TLV431AQFTA FAQ
1.How can I place an order for TLV431AQFTA through Aetrix?
Please submit a Request for Quotation (RFQ) for TLV431AQFTA 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 TLV431AQFTA reliable?
The price and inventory of TLV431AQFTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLV431AQFTA is usually 5 days.
3.What payment methods are accepted for TLV431AQFTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLV431AQFTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLV431AQFTA?
TLV431AQFTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLV431AQFTA 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 TLV431AQFTA?
For technical support, including TLV431AQFTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLV431AQFTA requirements.
6.How does Aetrix verify that TLV431AQFTA is sourced from the original manufacturer or authorized distributors?
All TLV431AQFTA 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 TLV431AQFTA meets industry standards.
7.What is the process for return or replacement of TLV431AQFTA?
All TLV431AQFTA units undergo pre-shipment inspection (PSI). If there is an issue with TLV431AQFTA, 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 TLV431AQFTA part is unused and in its original packaging.
Return procedure for TLV431AQFTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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