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Texas Instruments TL431BIDBZRG4
- Part No.:
- TL431BIDBZRG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL431BIDBZRG4.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:11,348
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Product details
Overview
TL431BIDBZRG4 from Texas Instruments is a precision programmable shunt voltage reference in SOT-23-3 package, delivering 2.495 V nominal reference voltage with ±0.5% initial tolerance at 25°C, 14 mV max temperature drift over −40°C to 125°C, and 0.2 Ω typical dynamic impedance. It operates as an adjustable feedback element in isolated DC-DC converters and voltage-monitoring circuits.
For engineers reviewing the TL431BIDBZRG4 datasheet, TL431BIDBZRG4 pinout, TL431BIDBZRG4 application, or TL431BIDBZRG4 equivalent, key selection criteria include its Q-grade automotive temperature range, low output noise, sink-current capability up to 100 mA, and compatibility with standard resistor-divider feedback networks for output voltages from 2.5 V to 36 V.
Technical Context
The TL431BIDBZRG4 implements a high-gain transconductance amplifier with internal 2.495 V bandgap reference, comparing REF pin voltage to Vref and driving the CATHODE to maintain regulation via external current sink. Its sharp turn-on characteristic and low output impedance enable stable operation in switching power supply feedback loops without requiring external compensation in many designs.
As a B-grade Q-temp variant, it is characterized across −40°C to 125°C with guaranteed 0.5% reference accuracy at 25°C and ≤34 mV total Vref deviation over full temperature range. The SOT-23-3 package supports compact layout while maintaining thermal resistance of 206°C/W (junction-to-ambient).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V ±12.5 mV at 25°C - enables precise feedback setpoint for regulated outputs from 2.5 V to 36 V using two external resistors |
| Initial Tolerance | ±0.5% (B grade) - ensures tight output voltage accuracy without trimming in production power supplies |
| Temp Range | −40°C to +125°C (Q grade) - qualified for under-hood automotive and industrial environments requiring extended thermal stability |
| Dynamic Impedance | 0.2 Ω typical - minimizes load-induced output variation and improves transient response in closed-loop regulation |
| Sink Current Range | 1 mA to 100 mA - supports direct interface with optocoupler LEDs or discrete transistor bases in isolated flyback controllers |
| Ref Input Current | 2–4 µA - allows use of high-value feedback resistors (e.g., 1 MΩ) to reduce power loss without degrading accuracy |
| Output Noise | Low broadband noise - maintains signal integrity in sensitive analog monitoring paths and precision ADC references |
Pinout & Package
SOT-23-3 package (2.90 mm × 1.30 mm), surface-mount, lead-free and RoHS-compliant. Thermal pad not present; standard reflow profile applicable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1: REF | Reference input | High-impedance comparator input; connected to resistor divider midpoint to sense output voltage |
| Pin 2: CATHODE | Current-sink output | Drives optocoupler LED or external transistor base; voltage regulated relative to ANODE |
| Pin 3: ANODE | Common return | Typically tied to system ground or power rail return; all voltages referenced to this node |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | Settable from 2.5 V to 36 V using two external resistors - eliminates need for multiple fixed-reference parts |
| Sharp turn-on characteristic | Fast regulation onset with minimal hysteresis - prevents oscillation in marginally stable feedback loops |
| Low output impedance | 0.2 Ω typical - reduces sensitivity to PCB trace resistance and improves load regulation |
| Low reference input current | 2–4 µA - enables high-resistance feedback networks that minimize quiescent power consumption |
| Automotive-grade temp range | −40°C to +125°C operation - meets AEC-Q100 stress test requirements for automotive power modules |
Applications
| Rack Server Power | Industrial AC/DC Converter |
|---|---|
Use Scenario: Secondary-side voltage regulation in multi-output telecom rectifiers with optocoupler-based isolation. IC Role / Device Role / Timing Role: Shunt reference providing error signal to optocoupler LED, enabling isolated feedback without secondary-side controller. Use Value: Maintains ±1% output accuracy across line/load/temperature with no secondary-side IC, reducing BOM cost and board space. | Use Scenario: Output voltage sensing and regulation in 3 kW industrial SMPS with wide input range (85–265 VAC). IC Role / Device Role / Timing Role: Precision voltage reference in primary-side controller feedback loop via auxiliary winding sensing. Use Value: Enables stable regulation despite transformer leakage inductance and winding resistance variations across manufacturing lot. |
| AC Inverter Drive | 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: Reference input for comparator-based overvoltage latch circuit protecting IGBT gate drivers. Use Value: Guarantees trip threshold accuracy within ±0.5% over full operating temperature, preventing nuisance shutdowns. | Use Scenario: Feedback reference for dual-loop position/speed control power stage in robotic joint actuators. IC Role / Device Role / Timing Role: Stable reference for DAC-controlled current limit setting and analog fault detection thresholds. Use Value: Ensures repeatable current-limit accuracy across ambient temperature swings during continuous duty cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431BQDBZR | Same device, identical electrical specs and Q-temp rating; differs only in tape-and-reel packaging (no G4 suffix) | No functional difference; both rated for −40°C to 125°C with 0.5% initial tolerance | Select TL431BQDBZR if standard reel packaging is preferred for SMT line compatibility |
| TLVH431BQDBZR | Lower 1.24 V reference voltage, higher 6 µA max reference current, same Q-temp grade and SOT-23-3 package | Used where lower reference voltage enables tighter low-voltage regulation (e.g., 1.8 V or 3.3 V rails) | Choose TLVH431BQDBZR only when 1.24 V reference is required; not drop-in compatible due to different Vref and bias current |
Compared with TL431BQDBZR, TL431BIDBZRG4 offers identical performance but ships in TI's G4-compliant tape-and-reel format optimized for automated placement. Versus TLVH431BQDBZR, it provides higher reference voltage and lower input current-critical for high-impedance feedback networks in 12 V+ systems.
Availability
TL431BIDBZRG4 is available at Aetrix Electronics and suitable for rack server power, industrial AC/DC converters, and servo drive control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TL431BIDBZRG4 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 headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management technologies with over 50 years of innovation in precision analog ICs.
The TL431 product line was designed as a pin-compatible, cost-effective replacement for Zener diodes in voltage regulation and error amplification applications, targeting high-reliability power conversion systems across automotive, industrial, and computing markets.
FAQ
What is the reference voltage accuracy of TL431BIDBZRG4 at 25°C?
The TL431BIDBZRG4 has a reference voltage of 2.495 V with ±0.5% initial tolerance at 25°C, corresponding to a guaranteed range of 2.483 V to 2.507 V per the TL431BQ electrical characteristics table. This B-grade specification ensures high-precision feedback in production power supplies without calibration.
Does TL431BIDBZRG4 support operation at 125°C?
Yes, TL431BIDBZRG4 is a Q-grade device characterized for continuous operation from −40°C to +125°C. Its maximum junction temperature is 150°C, and thermal resistance (RθJA) is 206°C/W in the SOT-23-3 package, enabling reliable use in under-hood automotive and high-ambient industrial environments.
What is the minimum cathode current required for regulation in TL431BIDBZRG4?
The TL431BIDBZRG4 requires a minimum cathode current of 0.4 mA to maintain regulation, as specified in Section 6.12 (TL431BI) and 6.13 (TL431BQ) of the datasheet. This low Imin enables stable operation even with high-value feedback resistors and weak optocoupler drive conditions.
Can TL431BIDBZRG4 replace a standard Zener diode in a linear regulator?
Yes, TL431BIDBZRG4 can directly replace Zener diodes in shunt regulator configurations. Its 0.2 Ω dynamic impedance, sharp turn-on, and adjustable 2.5–36 V output provide superior regulation accuracy, temperature stability, and flexibility compared to discrete Zeners-especially in applications requiring <1% tolerance.
Is TL431BIDBZRG4 pin-compatible with other TL431 variants in SOT-23-3?
Yes, TL431BIDBZRG4 uses the standard TL431 SOT-23-3 pinout (REF–CATHODE–ANODE), matching all TL431x and TL432x DBZ variants. However, TL432 devices have reversed CATHODE/ANODE pins in DBZ; TL431BIDBZRG4 must not be substituted with TL432 parts without board revision.
TL431BIDBZRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- SOT-23-3
TL431BIDBZRG4 FAQ
1.How can I place an order for TL431BIDBZRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431BIDBZRG4 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 TL431BIDBZRG4 reliable?
The price and inventory of TL431BIDBZRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431BIDBZRG4 is usually 5 days.
3.What payment methods are accepted for TL431BIDBZRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431BIDBZRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431BIDBZRG4?
TL431BIDBZRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431BIDBZRG4 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 TL431BIDBZRG4?
For technical support, including TL431BIDBZRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431BIDBZRG4 requirements.
6.How does Aetrix verify that TL431BIDBZRG4 is sourced from the original manufacturer or authorized distributors?
All TL431BIDBZRG4 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 TL431BIDBZRG4 meets industry standards.
7.What is the process for return or replacement of TL431BIDBZRG4?
All TL431BIDBZRG4 units undergo pre-shipment inspection (PSI). If there is an issue with TL431BIDBZRG4, 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 TL431BIDBZRG4 part is unused and in its original packaging.
Return procedure for TL431BIDBZRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431BIDBZRG4 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
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LM4040DIM3X-2.5/NOPB
Texas Instruments
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LM4040DIM3-2.5/NOPB
Texas Instruments
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AZ431LANTR-G1
Diodes Incorporated
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