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Texas Instruments TL431IPG4
- Part No.:
- TL431IPG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
TL431IPG4.pdf
- Description:
- IC VREF SHUNT ADJ 2.2% 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,078
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Product details
Overview
TL431IPG4 from Texas Instruments is a precision programmable shunt voltage reference IC with 1% initial tolerance at 25°C, adjustable output voltage from 2.495 V to 36 V, and operation across −40°C to 85°C. It delivers 0.2 Ω typical dynamic impedance, 1–100 mA sink-current capability, and low output noise-enabling accurate feedback in isolated DC-DC converters and industrial power supplies.
For engineers reviewing the TL431IPG4 datasheet, TL431IPG4 pinout, TL431IPG4 application, or TL431IPG4 equivalent, key selection criteria include its I-grade temperature range, SOT-23-3 package footprint, cathode-anode-reference terminal configuration, and compatibility with optocoupler-based secondary-side regulation in AC/DC adapters and servo drive control modules.
Technical Context
The TL431IPG4 implements a three-terminal adjustable shunt regulator architecture with an internal 2.495 V reference and high-gain error amplifier. Its sharp turn-on characteristic and active output stage replace discrete Zener diodes in closed-loop feedback paths.
It operates as a voltage-controlled current sink: when the REF pin voltage exceeds 2.495 V, the device conducts between CATHODE and ANODE to maintain regulation. Stability depends on external RC compensation and load capacitance, with oscillation boundaries documented for SOT-23-3 variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V ±1% at 25°C - sets precise regulation threshold for feedback networks |
| Temp Range | −40°C to +85°C - qualified for industrial ambient conditions without derating |
| Sink Current | 1 mA to 100 mA - supports direct optocoupler LED drive or series-pass transistor biasing |
| Dynamic Impedance | 0.2 Ω typical - ensures minimal output voltage deviation under load transients |
| Output Noise | Low broadband noise - preserves loop stability in high-gain SMPS feedback paths |
| Ref Input Current | 2–4 µA - enables high-impedance resistor dividers without significant error |
Pinout & Package
TL431IPG4 is housed in a SOT-23-3 surface-mount package (2.90 mm × 1.30 mm body) with gull-wing leads. Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE (Pin 1) | Shunt current input node | Connects to regulated output rail; sinks current to maintain reference voltage at REF |
| REF (Pin 2) | Reference voltage sense input | High-impedance comparator input; regulates when voltage equals 2.495 V ±1% |
| ANODE (Pin 3) | Common return path | Typically tied to system ground or low-side return; completes current path for regulation |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Output Voltage | Set from 2.495 V to 36 V using two external resistors - eliminates need for multiple fixed-voltage references |
| Low Dynamic Impedance | 0.2 Ω typical - minimizes output voltage variation during load steps in power supply feedback loops |
| Industrial Temp Grade | −40°C to +85°C operation - supports deployment in motor drives, PLCs, and industrial AC/DC systems |
| Optocoupler-Compatible Sink | 1–100 mA cathode current range - directly interfaces with PC817/HLK-10M optocouplers in isolated flyback designs |
Applications
| Rack Server Power | Industrial AC/DC |
|---|---|
Use Scenario: Secondary-side voltage regulation in 1U server PSUs with tight efficiency and transient response requirements. IC Role / Device Role / Timing Role: Shunt reference in optocoupler-coupled feedback loop controlling primary-side PWM controller. Use Value: 1% initial accuracy and low dynamic impedance ensure ±1% output regulation across line/load/temperature. | Use Scenario: Programmable overvoltage protection and output trimming in DIN-rail mounted AC/DC modules. IC Role / Device Role / Timing Role: Adjustable voltage monitor and precision shunt element in analog supervision circuitry. Use Value: Wide 2.495–36 V adjustment range allows single BOM part to support multiple output voltages (12 V, 24 V, 48 V). |
| AC Inverter & VF Drives | Servo Drive Control Module |
Use Scenario: DC bus voltage sensing and regulation in variable-frequency motor drives with regenerative braking. IC Role / Device Role / Timing Role: High-stability shunt reference for analog-to-digital converter (ADC) input scaling and fault detection thresholds. Use Value: Low temperature drift (≤34 mV over −40°C to +85°C) maintains measurement accuracy across thermal cycling. | Use Scenario: Isolated feedback for auxiliary 5 V/3.3 V rails powering gate drivers and position encoder interfaces. IC Role / Device Role / Timing Role: Precision voltage reference for secondary-side error amplification in isolated buck-derived bias supplies. Use Value: SOT-23-3 footprint enables compact layout near optocoupler, minimizing parasitic inductance in high-noise servo environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431CDBVR | Same electrical specs but C-grade (0°C to 70°C); SOT-23-3 package identical | Not rated for −40°C start-up; unsuitable for outdoor or unheated industrial enclosures | Select TL431CDBVR only for commercial-temperature consumer or telecom applications |
| TLVH431QDBVRQ1 | Automotive AEC-Q100 qualified; tighter 0.5% initial tolerance; same pinout and 2.5 V ref | Higher cost; overqualified for non-automotive use; requires automotive-grade sourcing | Choose TLVH431QDBVRQ1 only when AEC-Q100 compliance or <0.5% tolerance is mandatory |
Compared with TL431CDBVR and TLVH431QDBVRQ1, TL431IPG4 provides the optimal balance of industrial temperature range, 1% accuracy, and cost-effectiveness for non-automotive embedded power systems-without requiring PCB redesign or thermal derating.
Availability
TL431IPG4 is available at Aetrix Electronics and suitable for rack server power, industrial AC/DC, and servo drive control module designs requiring stable component supply and long-term manufacturability.
Supply support for TL431IPG4 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.
The TL431 product line delivers precision programmable shunt references for feedback, monitoring, and voltage supervision in industrial, computing, and motor control power systems.
FAQ
What is the reference voltage tolerance of TL431IPG4 at 25°C?
The TL431IPG4 has a reference voltage tolerance of ±1% at 25°C, corresponding to the 'A' grade designation. This means its nominal 2.495 V reference falls within 2.470 V to 2.520 V at room temperature, enabling reliable feedback in mid-precision power supplies where tighter tolerances are not required.
Does TL431IPG4 support operation below −40°C?
No, TL431IPG4 is specified for operation from −40°C to +85°C (I-grade). It is not characterized or guaranteed for functionality below −40°C. For extended low-temperature applications such as outdoor base stations or arctic instrumentation, consider the Q-grade variant TL431BQDBVR or consult TI's full temperature characterization data.
Can TL431IPG4 be used in place of a Zener diode?
Yes, TL431IPG4 serves as a superior replacement for Zener diodes in most shunt regulation applications. Its active circuitry provides sharper turn-on, lower dynamic impedance (0.2 Ω vs. >10 Ω for typical Zeners), and adjustable output via external resistors-making it ideal for precision feedback in switching regulators and voltage monitors.
What is the maximum cathode voltage rating for TL431IPG4?
The absolute maximum cathode-to-anode voltage (VKA) for TL431IPG4 is 37 V. The recommended operating range is Vref to 36 V. Exceeding 37 V risks permanent damage. Designers must ensure transient overvoltage events-such as load dump or inductive kickback-remain within this limit, typically using clamping or snubbing circuits.
Is TL431IPG4 pin-compatible with other TL431 variants in SOT-23-3?
Yes, TL431IPG4 uses the standard TL431 SOT-23-3 pinout: Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE. It is pin-compatible with TL431CDBVR, TL431BIDBVR, and all other SOT-23-3 packaged TL431x devices-allowing drop-in substitution across grades without PCB changes.
TL431IPG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Series:
- -
- Packaging:
- Tube
- 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:
- ±2.2%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 1 mA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
TL431IPG4 FAQ
1.How can I place an order for TL431IPG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431IPG4 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 TL431IPG4 reliable?
The price and inventory of TL431IPG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431IPG4 is usually 5 days.
3.What payment methods are accepted for TL431IPG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431IPG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431IPG4?
TL431IPG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431IPG4 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 TL431IPG4?
For technical support, including TL431IPG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431IPG4 requirements.
6.How does Aetrix verify that TL431IPG4 is sourced from the original manufacturer or authorized distributors?
All TL431IPG4 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 TL431IPG4 meets industry standards.
7.What is the process for return or replacement of TL431IPG4?
All TL431IPG4 units undergo pre-shipment inspection (PSI). If there is an issue with TL431IPG4, 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 TL431IPG4 part is unused and in its original packaging.
Return procedure for TL431IPG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431IPG4 Tags
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TL431AIDBZR
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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
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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
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AZ431LANTR-G1
Diodes Incorporated
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