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Texas Instruments TL431BIDRE4
- Part No.:
- TL431BIDRE4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TL431BIDRE4.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,206
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Product details
Overview
TL431BIDRE4 from Texas Instruments is a precision programmable shunt voltage reference IC with 0.5% initial tolerance at 25°C, adjustable output from 2.495 V to 36 V, and operation across −40°C to 125°C. It delivers 0.2 Ω typical dynamic impedance, 1–100 mA sink-current capability, and low 14 mV max reference voltage drift over temperature - used in feedback loops of isolated DC/DC converters and industrial AC/DC power supplies.
For engineers reviewing the TL431BIDRE4 datasheet, TL431BIDRE4 pinout, TL431BIDRE4 application, or TL431BIDRE4 equivalent, this page provides verified electrical specs, thermal behavior, stability boundaries, real-world use cases in servo drives and rack servers, and validated alternative parts for design flexibility and supply continuity.
Technical Context
The TL431BIDRE4 implements a three-terminal adjustable shunt regulator architecture with an internal 2.495 V reference, error amplifier, and NPN output stage. Its sharp turn-on characteristic and low output impedance enable precise regulation without external compensation in most configurations.
It operates as a voltage-controlled current sink: the REF pin senses voltage relative to ANODE, and cathode current (IKA) adjusts to maintain VREF = 2.495 V across external resistive divider. Stability depends on load capacitance and cathode voltage - Q-grade devices require careful CL selection per Figure 6-18 to avoid oscillation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V ±12 mV (0.5% B-grade tolerance at 25°C); sets precise feedback threshold in SMPS error amplifiers |
| Temp Range | −40°C to +125°C (Q-grade); supports automotive under-hood and industrial motor drive environments |
| Dynamic Impedance | 0.2 Ω typical (≤0.5 Ω max); ensures minimal output voltage shift under load transients |
| Sink Current Range | 1 mA to 100 mA; enables direct interface with optocoupler LEDs or gate drivers without buffering |
| Ref Input Current | 2–4 µA typical; allows high-value feedback resistors (>1 MΩ), reducing power loss in battery-powered systems |
| Voltage Drift | ≤34 mV over full temperature range; guarantees stable regulation in wide-ambient applications like solar inverters |
| Output Noise | Low broadband noise (Figure 6-7); critical for low-noise LDO pre-regulators and precision ADC references |
Pinout & Package
SOT-23-3 (DBZ) package: 2.90 mm × 1.30 mm body, 3-pin surface-mount, lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1: Cathode | Current sink output | Connects to primary-side feedback node (e.g., optocoupler anode); carries full regulation current up to 100 mA |
| Pin 2: Ref | Reference input | Senses voltage divider output; must be held at 2.495 V ± tolerance to regulate; high-impedance (µA-level bias) |
| Pin 3: Anode | Common return | Typically tied to system ground or negative rail; serves as voltage reference point for REF and Cathode |
Key Features
| Feature | Design Value |
|---|---|
| 0.5% Initial Accuracy (B Grade) | Reduces need for post-production trimming in high-volume power supply manufacturing |
| Adjustable Output (2.495 V to 36 V) | Single part replaces multiple Zener diodes; simplifies BOM across 12 V, 24 V, and 48 V industrial rails |
| Q-Temp Rating (−40°C to 125°C) | Qualified for under-hood automotive modules and industrial servo drives without derating |
| 0.2 Ω Dynamic Impedance | Maintains <10 mV output deviation during 50 mA load steps - essential for tight-loop SMPS stability |
| Stability Boundary Data Provided | Figures 6-18/6-19 define safe CL vs IKA operating zones - eliminates guesswork in flyback compensator design |
Applications
| Rack Server Power | Industrial AC/DC |
|---|---|
Use Scenario: Secondary-side voltage feedback in isolated 48 V/12 V DC/DC modules for datacenter PSUs. IC Role / Device Role / Timing Role: Shunt reference controlling optocoupler LED current to regulate primary-side controller via isolated feedback path. Use Value: 0.5% accuracy ensures ±0.06 V output tolerance at 12 V; low drift maintains regulation across server inlet temperature swings. |
Use Scenario: Output voltage sensing in 3 kW industrial rectifier with active PFC and LLC resonant stage. IC Role / Device Role / Timing Role: Precision shunt reference in secondary synchronous rectifier control loop, interfacing with microcontroller ADC. Use Value: 100 mA sink capability drives high-side gate driver directly; Q-temp rating survives transformer-heated enclosures. |
| AC Inverter & VF Drives | Servo Drive Control Module |
Use Scenario: DC bus voltage monitoring and overvoltage protection in 7.5 kW variable-frequency motor drives. IC Role / Device Role / Timing Role: Adjustable shunt reference setting trip threshold for analog comparator-based OVP circuit. Use Value: 36 V max rating covers 650 V DC bus scaled down via resistor network; 14 mV temp drift prevents false trips at 85°C ambient. |
Use Scenario: Feedback reference for dual-loop current/voltage regulation in 3-phase servo amplifier PCBs. IC Role / Device Role / Timing Role: Stable 2.495 V reference for DAC output scaling and current-sense amplifier offset calibration. Use Value: Low 2–4 µA input current minimizes resistor-divider loading error; SOT-23-3 footprint saves space on dense motor control boards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431BQDBVR | Same B-grade accuracy and Q-temp rating, but in SOT-23-5 (DBV) package with NC pin; identical electrical specs. | Requires PCB layout change due to 5-pin footprint and different pinout (REF/ANODE/CATHODE order differs). | Select when board space allows larger SOT-23-5 or when NC pin enables future test access or routing flexibility. |
| TLVH431BQDBVR | Lower 1.24 V reference voltage, 1% initial accuracy, same Q-temp range; higher 10 µA max reference current. | Better suited for low-voltage rails (<5 V); not drop-in for 12 V+ systems requiring 2.495 V reference point. | Choose only when redesigning for sub-5 V outputs or where tighter low-voltage tolerance outweighs 0.5% B-grade advantage. |
Compared with TL431BIDRE4, TL431BQDBVR offers identical performance in a mechanically distinct package, while TLVH431BQDBVR trades reference voltage and accuracy for ultra-low-voltage compatibility - neither is pin-compatible, and both require schematic and layout validation.
Availability
TL431BIDRE4 is available at Aetrix Electronics and suitable for rack server power, industrial AC/DC, and servo drive control module applications requiring stable component supply, long-term lifecycle support, and automotive-grade temperature resilience.
Supply support for TL431BIDRE4 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 emphasis on reliability, longevity, and industrial-grade qualification.
The TL431 product line was designed as a precision, cost-effective replacement for discrete Zener diode + transistor shunt regulators - targeting high-volume power management in computing, industrial, and automotive systems.
FAQ
What is the reference voltage tolerance of TL431BIDRE4 at 25°C?
The TL431BIDRE4 has a 0.5% initial reference voltage tolerance at 25°C, meaning its VREF is guaranteed between 2.483 V and 2.507 V under nominal conditions. This B-grade specification is confirmed in Section 6.11 of the TI datasheet (SLVS543S) and applies specifically to the TL431BQ variant in SOT-23-3 packaging. The tolerance remains stable across load and line variations within recommended operating conditions.
Does TL431BIDRE4 support operation at 125°C ambient temperature?
Yes, TL431BIDRE4 is a Q-grade device rated for operation from −40°C to +125°C ambient temperature. Its electrical characteristics - including reference voltage, dynamic impedance, and sink current - are fully specified across this full range per Section 6.7 and 6.13 of the datasheet. Thermal derating is not required up to TJ = 150°C, supported by RθJA = 206°C/W for the SOT-23-3 package.
What is the maximum cathode voltage for TL431BIDRE4?
The absolute maximum cathode voltage (VKA) for TL431BIDRE4 is 37 V, with recommended operation up to 36 V. This limit is defined in Section 6.1 (Absolute Maximum Ratings) and applies regardless of temperature or current. Exceeding 37 V risks permanent damage; operation at 36 V is standard in 24 V and 48 V industrial power systems using appropriate resistive scaling.
How much current does the REF pin draw in TL431BIDRE4?
The REF pin of TL431BIDRE4 draws 2–4 µA typical input current at 25°C, with a maximum of 10 µA across temperature and process variation (Section 6.5–6.13). This low bias current enables use of high-value feedback resistors (e.g., 1 MΩ + 2.2 MΩ), minimizing power loss in battery-backed or energy-sensitive designs without compromising regulation accuracy.
Can TL431BIDRE4 replace a Zener diode in a linear regulator circuit?
Yes, TL431BIDRE4 is explicitly designed as a superior replacement for Zener diodes in shunt regulator applications. Its 0.2 Ω dynamic impedance, sharp turn-on, and 0.5% tolerance provide significantly better regulation accuracy and load transient response than typical 5% Zeners. It requires only two external resistors to set output voltage from 2.495 V to 36 V - demonstrated in TI's typical application circuits (Section 9.2).
TL431BIDRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 2.495V
- Voltage - Output (Max):
- 36 V
- Current - Output:
- 100 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 700 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
TL431BIDRE4 FAQ
1.How can I place an order for TL431BIDRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431BIDRE4 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 TL431BIDRE4 reliable?
The price and inventory of TL431BIDRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431BIDRE4 is usually 5 days.
3.What payment methods are accepted for TL431BIDRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431BIDRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431BIDRE4?
TL431BIDRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431BIDRE4 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 TL431BIDRE4?
For technical support, including TL431BIDRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431BIDRE4 requirements.
6.How does Aetrix verify that TL431BIDRE4 is sourced from the original manufacturer or authorized distributors?
All TL431BIDRE4 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 TL431BIDRE4 meets industry standards.
7.What is the process for return or replacement of TL431BIDRE4?
All TL431BIDRE4 units undergo pre-shipment inspection (PSI). If there is an issue with TL431BIDRE4, 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 TL431BIDRE4 part is unused and in its original packaging.
Return procedure for TL431BIDRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431BIDRE4 Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
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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
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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
-
LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
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