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Texas Instruments TLV431AIDR
- Part No.:
- TLV431AIDR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TLV431AIDR.pdf
- Description:
- IC VREF SHUNT ADJ 1% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,842
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Product details
Overview
TLV431AIDR from Texas Instruments is a low-voltage adjustable precision shunt regulator with 1.24 V reference voltage, 1% initial tolerance at 25°C, and operation down to 1.24 V cathode-anode voltage. It delivers 0.25 Ω typical dynamic impedance, 80 µA typical minimum cathode current, and supports output voltage adjustment from 1.24 V to 6 V using two external resistors - widely deployed in isolated flyback secondary-side regulation for 3.3 V SMPS.
For engineers reviewing the TLV431AIDR datasheet, TLV431AIDR pinout, TLV431AIDR application, or TLV431AIDR equivalent, this page provides verified electrical specifications, SC-70 package details, functional mode distinctions (open-loop comparator vs. closed-loop shunt regulator), thermal performance data, and validated alternative parts for voltage reference and error amplifier use cases.
Technical Context
The TLV431AIDR implements a bandgap-referenced transconductance amplifier driving a Darlington sink output stage, enabling precise voltage regulation or high-gain comparison without external compensation. Its internal reference is trimmed to 1.24 V ±1% at 25°C and exhibits 4 mV max drift over 0°C to 70°C industrial range.
In closed-loop configuration, it functions as a programmable shunt regulator where cathode voltage is set by resistor divider feedback to the REF pin; in open-loop mode, it operates as a comparator with integrated reference, delivering rail-to-rail sinking capability and ~1 V output low level under 500 µA load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF | 1.24 V ±1% at 25°C - sets minimum programmable output and defines trip point accuracy in comparator mode |
| VKA Range | 1.24 V to 6 V - enables direct regulation of 3.3 V, 5 V, and other low-voltage rails without external LDO |
| IK(min) | 80 µA typical - allows ultra-low-power biasing in battery-backed monitoring and energy-harvesting circuits |
| |zKA| | 0.25 Ω typical - ensures stable regulation under dynamic load steps up to 15 mA with minimal output deviation |
| Temp Drift | 4 mV (0°C to 70°C) - supports stable reference performance in commercial-grade power supplies and sensing interfaces |
| IREF | 0.15–0.5 µA - permits high-impedance feedback networks (>1 MΩ) without degrading reference accuracy |
| VKA Max | 7 V absolute max - defines safe operating window for optocoupler-coupled feedback in isolated DC/DC converters |
Pinout & Package
TLV431AIDR is housed in a 6-pin SC-70 (DCK) package measuring 2.0 mm × 1.5 mm - 40% smaller than SOT-23-3 - with exposed substrate pad connected internally to ANODE. Pin 2 (substrate) must be tied to ANODE or left floating per TI specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE (Pin 1) | Current sink output | Primary shunt path; sinks up to 15 mA; voltage at this node is regulated or compared against internal reference |
| REF (Pin 3) | Reference input | Sense node for feedback divider; requires ≥0.5 µA bias current; sets regulation point when used with R1/R2 network |
| ANODE (Pin 6) | Common return | Ground reference for all internal circuitry; substrate connection (Pin 2) must be tied here or left open |
| NC (Pins 4, 5) | No internal connection | Unused terminals; no bonding wire; may be left unconnected or grounded for mechanical stability |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Starts regulating at 1.24 V - enables direct use in 1.8 V, 2.5 V, and 3.3 V systems without pre-regulation |
| Adjustable output | Programmable from 1.24 V to 6 V via two-resistor divider - eliminates need for multiple fixed-voltage references |
| Ultra-small SC-70 footprint | 2.0 mm × 1.5 mm - saves PCB area in space-constrained applications like USB-C PD adapters and IoT sensor nodes |
| Stable without output capacitor | Internally compensated - avoids instability risks and BOM cost of external ceramic cap in shunt regulator designs |
| Open-loop comparator mode | Integrated 1.24 V reference + high open-loop gain - replaces discrete op-amp + Zener combos in voltage monitoring circuits |
Applications
| Isolated Flyback Regulation | Voltage Monitoring |
|---|---|
|
Use Scenario: Secondary-side voltage sensing in 3.3 V isolated flyback converters using optocoupler feedback. IC Role / Device Role / Timing Role: Precision shunt regulator and error amplifier - compares sampled output against 1.24 V reference and drives optocoupler LED current. Use Value: Enables tight output regulation (<±1%) across line/load/temperature while supporting <2.7 V minimum regulated output due to low VREF. |
Use Scenario: Overvoltage/undervoltage detection on microcontroller supply rails or battery inputs. IC Role / Device Role / Timing Role: Comparator with integrated reference - triggers reset or alert when input crosses 1.24 V × (1 + R1/R2) threshold. Use Value: Eliminates external reference IC and reduces component count; 80 µA IK(min) supports always-on monitoring in low-power systems. |
| Zener Diode Replacement | Adjustable Current Sink |
|
Use Scenario: On-board voltage regulation for analog sensors or DAC buffers requiring stable bias. IC Role / Device Role / Timing Role: Programmable shunt regulator - replaces discrete Zener diodes with tighter tolerance and lower dynamic impedance. Use Value: 0.25 Ω |zKA| yields <0.5% output deviation under 10 mA load step - outperforms 5% tolerance Zeners with >10 Ω impedance. |
Use Scenario: Constant-current source for LED biasing or photodiode transimpedance amplifier reference. IC Role / Device Role / Timing Role: Adjustable current sink - REF pin biased to set cathode current via IK = VREF/RSET. Use Value: Delivers stable current from 0.2 mA to 15 mA with <1% initial error and <4 mV temp drift - suitable for precision optical sensing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator and reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV431ACDBVR | Same SC-70 package, 0.5% VREF tolerance at 25°C, rated for 0°C to 70°C only | Better initial accuracy but narrower temperature range - suited for cost-sensitive commercial equipment | Select TLV431ACDBVR if ±0.5% reference accuracy is required and operation above 70°C is not needed. |
| TLVH431QDBVR | Wider VKA range (1.24 V to 18 V), higher IK (80 mA), SOT-23-3 package, 1.5% tolerance | Supports higher-output SMPS and automotive 12 V systems; lacks NC pins and substrate connection | Choose TLVH431QDBVR for 12 V or 24 V isolated supplies where extended voltage headroom and higher current are critical. |
Compared with TLV431AIDR, TLV431ACDBVR offers tighter initial tolerance but reduced thermal coverage, while TLVH431QDBVR trades precision for wider voltage range and higher current - making TLV431AIDR optimal for compact, industrial-temperature 3.3 V/5 V regulation where 1% accuracy and SC-70 size are prioritized.
Availability
TLV431AIDR is available at Aetrix Electronics and suitable for isolated flyback regulation, voltage monitoring, Zener replacement, and adjustable current sink applications requiring stable component supply, consistent parametric performance, and long-term manufacturability.
Supply support for TLV431AIDR 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 company specializing in analog and embedded processing technologies, with leadership in precision analog ICs and power management solutions.
The TLV431 family was designed specifically for low-voltage, high-accuracy shunt regulation and integrated-reference comparison in space-constrained power and sensing systems - targeting industrial, computing, and telecom applications.
FAQ
What is the maximum cathode voltage rating for TLV431AIDR?
The absolute maximum cathode-to-anode voltage (VKA) for TLV431AIDR is 7 V. Exceeding this value risks permanent damage. In normal operation, the recommended VKA range is 1.24 V to 6 V. This limit directly governs optocoupler forward voltage margin in isolated feedback designs and constrains maximum output voltage in shunt regulator configurations. TLV431AIDR must never be operated beyond 7 V between cathode and anode terminals.
Does TLV431AIDR require an output capacitor for stability?
No, TLV431AIDR is internally compensated and remains stable without an output capacitor between cathode and anode. This eliminates BOM cost and layout complexity in most shunt regulator applications. However, if a capacitor is added for noise filtering or transient response shaping, Figure 5-19 in the TI datasheet provides phase-margin guidance versus capacitive load - stability must be verified empirically when capacitance exceeds 1 nF.
How does the substrate pin (Pin 2) on TLV431AIDR affect layout?
Pin 2 on TLV431AIDR is the internal substrate connection and must be either tied to the ANODE (Pin 6) node or left electrically floating - it must never be connected to any other potential. This requirement ensures proper biasing of the internal PNP substrate transistor and prevents latch-up or parameter shift. In PCB layout, tie Pin 2 directly to the ANODE copper pour or leave it unconnected; do not route it to ground or signal nets.
Can TLV431AIDR be used as a standalone voltage reference without external resistors?
Yes, TLV431AIDR can operate as a 1.24 V two-terminal shunt reference by connecting REF (Pin 3) to ANODE (Pin 6) and applying current to CATHODE (Pin 1). In this configuration, it regulates at VREF = 1.24 V ±1% with 80 µA minimum cathode current and 0.25 Ω dynamic impedance. This mode is commonly used in low-power bias networks and precision current sources where fixed 1.24 V is sufficient.
What is the temperature range qualification for TLV431AIDR?
TLV431AIDR is qualified for operation from –40°C to 125°C (Q-grade), with electrical characteristics specified across this full range. The 1% VREF tolerance applies at 25°C; over temperature, VREF deviation is bounded at 11 mV max (–40°C to 125°C). This makes TLV431AIDR suitable for under-hood automotive modules, industrial motor drives, and high-ambient-temperature power supplies where extended thermal reliability is mandatory.
TLV431AIDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 1.24V
- Voltage - Output (Max):
- 6 V
- Current - Output:
- 15 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
TLV431AIDR FAQ
1.How can I place an order for TLV431AIDR through Aetrix?
Please submit a Request for Quotation (RFQ) for TLV431AIDR 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 TLV431AIDR reliable?
The price and inventory of TLV431AIDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLV431AIDR is usually 5 days.
3.What payment methods are accepted for TLV431AIDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLV431AIDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLV431AIDR?
TLV431AIDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLV431AIDR 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 TLV431AIDR?
For technical support, including TLV431AIDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLV431AIDR requirements.
6.How does Aetrix verify that TLV431AIDR is sourced from the original manufacturer or authorized distributors?
All TLV431AIDR 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 TLV431AIDR meets industry standards.
7.What is the process for return or replacement of TLV431AIDR?
All TLV431AIDR units undergo pre-shipment inspection (PSI). If there is an issue with TLV431AIDR, 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 TLV431AIDR part is unused and in its original packaging.
Return procedure for TLV431AIDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLV431AIDR Tags
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TL431AIDBZR
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TL431BQDBZR
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LM4040EIM3-2.5/NOPB
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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
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