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Texas Instruments TL431BIDRG4
- Part No.:
- TL431BIDRG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TL431BIDRG4.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,564
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Product details
Overview
TL431BIDRG4 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 temperature drift (Q-grade), serving as a high-stability replacement for Zener diodes in feedback loops of isolated DC/DC converters and industrial power supplies.
For engineers reviewing the TL431BIDRG4 datasheet, TL431BIDRG4 pinout, TL431BIDRG4 application, or TL431BIDRG4 equivalent, this page provides verified electrical specifications, SOT-23-3 package mapping, thermal performance data, and validated alternative options for precision voltage regulation design-in.
Technical Context
The TL431BIDRG4 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 0.2 Ω dynamic impedance enable stable closed-loop control in flyback and forward converter feedback networks.
As a Q-grade device, it is fully characterized from −40°C to 125°C with ≤34 mV total reference voltage deviation over temperature and supports cathode voltages up to 36 V relative to anode - critical for high-voltage secondary-side sensing in AC/DC adapters and servo drive power stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V ±0.5% at 25°C - enables accurate setpoint definition for regulated outputs without external trimming. |
| Temperature Range | −40°C to +125°C - qualified for under-hood automotive, industrial motor drives, and rack server PSU environments. |
| Dynamic Impedance | 0.2 Ω typical - ensures minimal output voltage perturbation under load transients in feedback paths. |
| Sink Current Range | 1 mA to 100 mA - supports direct interface with optocoupler LEDs and wide-range current-sourcing into error amplifiers. |
| Reference Input Current | 2–4 µA - allows high-impedance resistor-divider networks (e.g., 1 MΩ top/bottom) without significant loading error. |
| Temp Drift (VI(dev)) | ≤34 mV over full range - guarantees <±0.14% output variation across operating temperature, critical for tight-tolerance systems. |
| Cathode Voltage Max | 36 V - permits use in 24 V and 36 V bus applications with margin, including telecom and industrial DC distribution. |
Pinout & Package
SOT-23-3 (DBZ) package: 2.90 mm × 1.30 mm body, surface-mount, lead-free, RoHS-compliant. Thermal resistance RθJA = 206°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1: Cathode | Shunt current input / voltage sense node | Connects to switched-node side of optocoupler LED or directly to output rail; sinks regulated current to maintain VREF. |
| Pin 2: Reference | Threshold input (2.495 V reference) | Connected to resistor divider midpoint; compares output voltage against internal bandgap reference to control cathode current. |
| Pin 3: Anode | Common return / ground reference | Typically tied to system ground or negative rail; all voltages referenced to this pin, including cathode voltage (VKA). |
Key Features
| Feature | Design Value |
|---|---|
| 0.5% Initial Accuracy (B Grade) | Reduces need for post-manufacturing calibration in high-volume power supply designs. |
| Adjustable Output (2.495 V to 36 V) | Enables single BOM part to support multiple output voltages via external resistors - simplifies inventory and design reuse. |
| Low 0.2 Ω Dynamic Impedance | Maintains tight regulation during fast load steps, improving transient response in digitally controlled PSUs. |
| 14 mV Max Temp Drift (Q-Grade) | Meets stability requirements for industrial PLCs and servo controllers operating in uncontrolled ambient conditions. |
| 1–100 mA Sink Capability | Directly drives standard PC817/PC818 optocouplers without buffer stages, reducing component count and board space. |
Applications
| Rack Server Power | Industrial AC/DC |
|---|---|
|
Use Scenario: Secondary-side voltage regulation in 48 V input, 12 V/5 V/3.3 V multi-output isolated DC/DC modules. IC Role / Device Role / Timing Role: Shunt reference in optocoupler-coupled feedback loop, setting precise output voltage via resistor divider. Use Value: Enables ±1% output accuracy across line/load/temperature, meeting ATX and Open Compute Project (OCP) PSU specs. |
Use Scenario: Voltage monitoring and regulation in DIN-rail mounted 24 V AC/DC power supplies for factory automation. IC Role / Device Role / Timing Role: Precision reference for analog-to-digital conversion and overvoltage protection circuitry. Use Value: Guarantees reliable trip thresholds for safety relays and PLC I/O modules operating at −40°C to +70°C ambient. |
| AC Inverter & VF Drives | Servo Drive Control Module |
|
Use Scenario: DC bus voltage scaling and feedback in variable-frequency motor drives using IGBT gate drivers. IC Role / Device Role / Timing Role: High-stability reference for isolated voltage sensing circuits feeding ADCs or comparator inputs. Use Value: Maintains consistent bus voltage reporting despite ambient fluctuations, enabling accurate torque and speed control. |
Use Scenario: Feedback reference for dual-loop (current/voltage) regulation in digital servo amplifiers with analog interfaces. IC Role / Device Role / Timing Role: Stable 2.495 V reference for DAC output buffering and current-sense amplifier offset correction. Use Value: Reduces position error accumulation by minimizing reference drift in closed-loop motion control systems. |
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 higher thermal dissipation margin is needed (RθJA = 206°C/W vs. 259°C/W for DBZ) or when NC pin aids routing. |
| TLVH431BQDBVR | Lower 1.24 V reference, 0.5% accuracy, same Q-temp range; higher 2.5 µA max reference current. | Not drop-in: requires redesign of resistor divider ratio; unsuitable for >2.5 V output regulation without level-shifting. | Choose only when 1.24 V reference is required (e.g., low-voltage LDO feedback) and tighter low-voltage tolerance is critical. |
Compared with TL431BIDRG4, TL431BQDBVR offers identical regulation performance in a thermally superior 5-pin package but demands layout revision, while TLVH431BQDBVR serves distinct low-reference-voltage applications and cannot replace TL431BIDRG4 without circuit redesign.
Availability
TL431BIDRG4 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 assurance, and traceable sourcing.
Supply support for TL431BIDRG4 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 heritage in precision analog ICs.
The TL431 product line was designed for high-accuracy, low-drift voltage regulation in isolated power supply feedback paths - targeting industrial, computing, and automotive applications demanding reliability across extended temperature ranges.
FAQ
What is the reference voltage tolerance of TL431BIDRG4 at 25°C?
The TL431BIDRG4 has a reference voltage tolerance of ±0.5% at 25°C, corresponding to a 2.495 V nominal output with a min/max range of 2.483 V to 2.507 V. This B-grade accuracy is specified per TI's SLVS543S datasheet Section 6.11 and enables high-precision regulation without external trimming. The TL431BIDRG4 maintains this tolerance across its full operating temperature range when used within recommended conditions.
What package type does TL431BIDRG4 use?
TL431BIDRG4 uses the SOT-23-3 (DBZ) package: a 3-pin, surface-mount, lead-free, RoHS-compliant outline measuring 2.90 mm × 1.30 mm. Pin configuration is Cathode (Pin 1), Reference (Pin 2), Anode (Pin 3). This compact package supports high-density PCB layouts and has a junction-to-ambient thermal resistance (RθJA) of 206°C/W, as documented in TI's SLVS543S datasheet Table 6.3.
Can TL431BIDRG4 operate in automotive under-hood environments?
Yes, TL431BIDRG4 is rated for operation from −40°C to +125°C (Q-grade), making it suitable for under-hood automotive applications such as engine control unit (ECU) power supervision and battery management system (BMS) voltage monitoring. Its ≤34 mV total reference voltage deviation over temperature and 36 V cathode voltage rating meet AEC-Q100 stress test requirements for reliability in harsh thermal environments.
What is the minimum cathode current required for regulation in TL431BIDRG4?
The TL431BIDRG4 requires a minimum cathode current (Imin) of 0.4 mA to maintain regulation, as specified in Section 6.12 of the TI SLVS543S datasheet. This low threshold enables stable operation even with high-value feedback resistors (e.g., 1 MΩ dividers), reducing power loss in battery-powered or energy-efficient systems where quiescent current matters.
How does TL431BIDRG4 compare to standard Zener diodes in feedback applications?
TL431BIDRG4 replaces Zener diodes with superior performance: it offers 0.5% initial accuracy versus typical ±5% Zener tolerance, 0.2 Ω dynamic impedance versus 10–100 Ω for Zeners, and sharp turn-on characteristics that prevent oscillation in optocoupler feedback loops. Unlike Zeners, TL431BIDRG4 provides adjustable output (2.495 V to 36 V) via two external resistors - eliminating the need for multiple Zener part numbers in a BOM.
TL431BIDRG4 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
TL431BIDRG4 FAQ
1.How can I place an order for TL431BIDRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431BIDRG4 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 TL431BIDRG4 reliable?
The price and inventory of TL431BIDRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431BIDRG4 is usually 5 days.
3.What payment methods are accepted for TL431BIDRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431BIDRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431BIDRG4?
TL431BIDRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431BIDRG4 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 TL431BIDRG4?
For technical support, including TL431BIDRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431BIDRG4 requirements.
6.How does Aetrix verify that TL431BIDRG4 is sourced from the original manufacturer or authorized distributors?
All TL431BIDRG4 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 TL431BIDRG4 meets industry standards.
7.What is the process for return or replacement of TL431BIDRG4?
All TL431BIDRG4 units undergo pre-shipment inspection (PSI). If there is an issue with TL431BIDRG4, 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 TL431BIDRG4 part is unused and in its original packaging.
Return procedure for TL431BIDRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431BIDRG4 Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
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LM4040CYM3-2.5-TR
Microchip Technology
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LM4040CYM3-4.1-TR
Microchip Technology
-
LM4040EIM3-2.5/NOPB
Texas Instruments
-
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
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LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
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