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Texas Instruments TL431BIDR
- Part No.:
- TL431BIDR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TL431BIDR.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,693
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Product details
Overview
TL431BIDR from Texas Instruments is a precision programmable shunt voltage reference in SOT-23-3 package, featuring 0.5% initial reference voltage 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 temperature drift (Q-grade), making it ideal for feedback regulation in isolated DC/DC converters.
For engineers reviewing the TL431BIDR datasheet, TL431BIDR pinout, TL431BIDR application, or TL431BIDR equivalent, key selection considerations include its Q-temp grade thermal stability, SOT-23-3 footprint compatibility with space-constrained power supplies, cathode current regulation range, and direct replacement suitability for Zener-based feedback networks in industrial AC/DC and servo drive control modules.
Technical Context
The TL431BIDR 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 active output circuitry enable precise voltage regulation without external compensation in most configurations.
As a Q-grade device, TL431BIDR is characterized for −40°C to 125°C operation and exhibits ≤34 mV total reference voltage deviation over that range. Its 0.2 Ω dynamic impedance and low 2–4 µA reference input current support stable closed-loop performance in high-gain feedback paths of switching regulators.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V ±5 mV at 25°C - sets precise feedback threshold for output regulation |
| Initial Tolerance | ±0.5% (B grade) - enables tight output voltage accuracy without trimming |
| Temp Range | −40°C to +125°C - qualified for under-hood automotive and industrial motor drive environments |
| Dynamic Impedance | 0.2 Ω typical - ensures minimal output voltage shift under load transients |
| Sink Current Range | 1 mA to 100 mA - supports direct interface with optocoupler LEDs in isolated flyback controllers |
| Ref Input Current | 2–4 µA - allows high-value feedback resistors (>1 MΩ), reducing power loss and noise sensitivity |
| Temp Drift (VIdev) | ≤34 mV over full range - guarantees <0.03%/°C effective TC for stable long-term regulation |
Pinout & Package
SOT-23-3 package (2.90 mm × 1.30 mm), surface-mount, lead-free, RoHS-compliant. Pin 1 = Cathode, Pin 2 = Anode, Pin 3 = Reference.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current output node | Connects to primary-side feedback network; sinks current to regulate output voltage |
| Anode (Pin 2) | Common return/reference ground | Typically tied to system ground or secondary-side common; defines reference potential |
| Reference (Pin 3) | Threshold input | Compares external divider voltage against internal 2.495 V reference to control cathode conduction |
Key Features
| Feature | Design Value |
|---|---|
| 0.5% reference accuracy | Enables ±1% output voltage tolerance in well-designed SMPS without post-production calibration |
| 0.2 Ω dynamic impedance | Maintains regulation stability during fast load steps in servo power stages and rack server VRMs |
| −40°C to +125°C operation | Supports deployment in engine-control units, industrial inverters, and outdoor telecom power systems |
| Low 2–4 µA reference current | Permits use of >500 kΩ feedback dividers, minimizing standby power and improving noise immunity |
| Adjustable 2.495–36 V output | Allows single BOM part to cover multiple output rails (e.g., 5 V, 12 V, 24 V, 48 V) via resistor selection |
Applications
| Rack Server Power | Industrial AC/DC Converter |
|---|---|
Use Scenario: Secondary-side voltage feedback in 48 V input, 12 V/50 A isolated DC/DC module for data center power shelves. IC Role / Device Role / Timing Role: Precision shunt reference providing error signal to optocoupler-driven primary controller. Use Value: 0.5% initial tolerance and 34 mV max temp drift ensure output stays within ±1.2% over full operating temperature, meeting PSPL compliance. |
Use Scenario: Output voltage regulation in 3-phase rectified 400 VAC-to-24 VDC industrial power supply for PLC I/O modules. IC Role / Device Role / Timing Role: Adjustable shunt reference setting feedback point for PWM controller in continuous conduction mode flyback. Use Value: 1–100 mA sink capability interfaces directly with PC817 optocoupler LED, eliminating need for external driver transistor. |
| AC Inverter Drive | Servo Drive Control Module |
Use Scenario: Auxiliary 15 V rail regulation in VFD main board, powering gate drivers and MCU peripherals. IC Role / Device Role / Timing Role: Shunt reference in non-isolated buck-derived auxiliary supply with wide input variation. Use Value: SOT-23-3 footprint saves PCB area in dense inverter control boards; −40°C to 125°C rating matches ambient requirements. |
Use Scenario: Feedback reference for dual-output (±15 V) isolated supply powering analog signal conditioning and encoder interface circuits. IC Role / Device Role / Timing Role: Dual-rail reference generator using two TL431BIDR devices with matched resistor networks. Use Value: Low 2–4 µA reference current minimizes mismatch error between positive/negative rails, improving common-mode rejection. |
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; SOT-23-5 package with NC pin (Pin 4) and relocated Anode (Pin 2) | Requires PCB layout change due to different pinout and 5-pin footprint; no functional advantage over TL431BIDR in 3-pin designs | Select only if redesigning for enhanced thermal dissipation (lower RθJA = 206°C/W vs 206°C/W) or future-proofing with NC pin |
| TLVH431BQDBVR | Lower 1.24 V reference voltage; same 0.5% tolerance and −40°C to 125°C rating; higher 10 µA max Iref | Enables sub-2.5 V output regulation (e.g., 1.8 V, 2.5 V rails); not interchangeable without feedback resistor recalculations | Choose when designing low-voltage outputs where TL431BIDR's 2.495 V minimum cannot meet target |
Compared with TL431BIDR, TL431BQDBVR demands PCB revision due to pinout mismatch, while TLVH431BQDBVR shifts the fundamental regulation threshold-neither offers drop-in replacement capability, but both serve adjacent design needs in thermally demanding or low-voltage applications.
Availability
TL431BIDR is available at Aetrix Electronics and suitable for rack server power, industrial AC/DC converters, and servo drive control modules requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.
Supply support for TL431BIDR 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 power management technologies, with decades of experience in precision reference and power control ICs.
The TL431 product line was designed as a pin-compatible, high-accuracy replacement for discrete Zener diode networks in feedback loops of linear and switching power supplies across industrial, computing, and motor control applications.
FAQ
What is the reference voltage tolerance of TL431BIDR at 25°C?
The TL431BIDR has a reference voltage tolerance of ±0.5% at 25°C, corresponding to a 2.495 V nominal reference with ±5 mV deviation. This B-grade accuracy is confirmed in Section 6.11 of the TI SLVS543S datasheet and applies specifically to the TL431BIDR variant with Q-temp qualification. The tolerance remains stable across its full −40°C to 125°C operating range.
Which package type does TL431BIDR use, and what are its dimensions?
TL431BIDR uses the SOT-23-3 package with nominal body size 2.90 mm × 1.30 mm. This 3-pin surface-mount outline is explicitly listed in the Device Information table of the TI datasheet for TL431Bx variants. Pin configuration is Cathode (Pin 1), Anode (Pin 2), Reference (Pin 3), and the package is RoHS-compliant and lead-free.
Can TL431BIDR replace a standard Zener diode in feedback circuits?
Yes, TL431BIDR is explicitly designed as a superior replacement for Zener diodes in voltage regulation feedback paths. Its active error amplifier provides sharper turn-on, lower dynamic impedance (0.2 Ω vs typical Zener's >10 Ω), and tighter tolerance (±0.5% vs ±5% for standard Zeners). The TL431BIDR datasheet confirms this use case in Section 3 and Figure 9-1 typical application schematics.
What is the maximum cathode current rating for TL431BIDR?
The TL431BIDR supports a continuous cathode current range of 1 mA to 100 mA, as specified in Section 6.4 (Recommended Operating Conditions) of the TI datasheet. Absolute maximum cathode current is ±150 mA, but sustained operation above 100 mA requires thermal derating per the device's RθJA = 206°C/W and maximum junction temperature of 150°C.
Does TL431BIDR support operation at high ambient temperatures?
Yes, TL431BIDR is rated for operation from −40°C to +125°C (Q-grade), verified across all electrical parameters in Sections 6.7 and 6.13 of the TI datasheet. Its 34 mV maximum reference voltage deviation over this range and guaranteed 0.2 Ω dynamic impedance at 125°C make it suitable for under-hood automotive, industrial inverter, and outdoor telecom power applications.
TL431BIDR 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):
- 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
TL431BIDR FAQ
1.How can I place an order for TL431BIDR through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431BIDR 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 TL431BIDR reliable?
The price and inventory of TL431BIDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431BIDR is usually 5 days.
3.What payment methods are accepted for TL431BIDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431BIDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431BIDR?
TL431BIDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431BIDR 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 TL431BIDR?
For technical support, including TL431BIDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431BIDR requirements.
6.How does Aetrix verify that TL431BIDR is sourced from the original manufacturer or authorized distributors?
All TL431BIDR 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 TL431BIDR meets industry standards.
7.What is the process for return or replacement of TL431BIDR?
All TL431BIDR units undergo pre-shipment inspection (PSI). If there is an issue with TL431BIDR, 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 TL431BIDR part is unused and in its original packaging.
Return procedure for TL431BIDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431BIDR Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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AN431AN-ATRG1
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LM4040CYM3-2.5-TR
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LM4040CYM3-4.1-TR
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LM4040EIM3-2.5/NOPB
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AZ431LBNTR-G1
Diodes Incorporated
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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
Texas Instruments
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AZ431LANTR-G1
Diodes Incorporated
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