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Texas Instruments TL431AIPG4
- Part No.:
- TL431AIPG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
TL431AIPG4.pdf
- Description:
- IC VREF SHUNT ADJ 1% 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,766
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Product details
Overview
TL431AIPG4 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 high-accuracy feedback in isolated DC/DC converters and industrial AC/DC power supplies.
For engineers reviewing the TL431AIPG4 datasheet, TL431AIPG4 pinout, TL431AIPG4 application, or TL431AIPG4 equivalent, this page provides verified technical context, package-specific pin functions, real-world application mappings, and validated alternative options for power supply regulation design.
Technical Context
The TL431AIPG4 implements a three-terminal adjustable shunt regulator architecture with an internal error amplifier, reference voltage (2.495 V), and NPN output stage. Its sharp turn-on characteristic and active output circuitry replace Zener diodes in precision feedback loops where thermal stability and low dynamic impedance are critical.
It operates as a voltage-controlled current sink: when the REF pin voltage exceeds 2.495 V, the cathode-anode path conducts to maintain regulation. The device requires no external compensation in most configurations but exhibits defined stability boundaries dependent on load capacitance and cathode current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V ±1% at 25°C - sets precise regulation threshold for feedback networks |
| Initial Tolerance | 1% (A grade) - enables tighter output voltage control vs. standard 2% grade in power supply designs |
| Operating Temperature | −40°C to +85°C (I grade) - supports industrial ambient conditions without derating |
| Dynamic Impedance | 0.2 Ω typical - minimizes output voltage variation under load transients in closed-loop systems |
| Sink Current Range | 1 mA to 100 mA - accommodates wide-range feedback resistor selection and optocoupler drive requirements |
| Output Noise | Low broadband noise - preserves signal integrity in sensitive analog feedback paths |
| Temp Drift (VI(dev)) | 14 mV max over full range - ensures <±0.05% output drift in 24 V systems across temperature |
Pinout & Package
TL431AIPG4 is supplied in the PDIP-8 (plastic dual in-line package) with 8 pins and nominal body size 9.50 mm × 6.35 mm. Pin 1 is Cathode, Pin 2 is Anode, Pin 3 is Reference (REF), and Pins 4–8 are No Internal Connection (NC).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE (Pin 1) | Shunt current/voltage input | Main current path into device; connects to primary-side feedback node in isolated flyback converters |
| ANODE (Pin 2) | Common reference terminal | Typically tied to system ground or return path; defines voltage reference point for REF pin |
| REF (Pin 3) | Threshold input | Compares external divider voltage against 2.495 V reference; triggers conduction when exceeded |
| Pins 4–8 | No internal connection | Unused; must remain unconnected or grounded per layout best practices to avoid parasitic coupling |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | 2.495 V to 36 V via two-resistor divider - eliminates need for multiple fixed-voltage references |
| Sharp turn-on characteristic | Fast, clean regulation transition - reduces overshoot and improves transient response in switching regulators |
| Low dynamic impedance | 0.2 Ω typical - maintains stable reference under varying load currents without external buffering |
| Wide sink-current capability | 1–100 mA - directly drives optocouplers (e.g., PC817) and supports multi-output feedback schemes |
| Thermal stability | 14 mV max deviation over −40°C to +85°C - ensures consistent regulation across industrial temperature range |
Applications
| Rack Server Power Supply | Industrial AC/DC Converter |
|---|---|
Use Scenario: Primary-side feedback in isolated 48 V/12 V telecom rectifiers with tight output tolerance requirements. IC Role / Device Role / Timing Role: Precision shunt reference providing error signal to PWM controller via optocoupler. Use Value: 1% initial tolerance and low temp drift enable ±1% output regulation over full operating temperature range. |
Use Scenario: Secondary-side voltage regulation in DIN-rail mounted 24 V AC/DC modules for PLC I/O power. IC Role / Device Role / Timing Role: Adjustable reference setting output voltage of linear post-regulator stage. Use Value: 0.2 Ω dynamic impedance prevents output droop during 10 A load steps, improving transient response. |
| AC Inverter Drive | Servo Drive Control Module |
Use Scenario: Feedback reference for auxiliary 15 V bias supply powering gate drivers and isolation amplifiers. IC Role / Device Role / Timing Role: Stable voltage reference for isolated DC/DC converter regulating auxiliary rail. Use Value: Low noise and sharp turn-on minimize jitter in gate driver timing, reducing EMI in motor control stages. |
Use Scenario: Reference source for analog current-sense amplifier offset calibration in torque loop circuits. IC Role / Device Role / Timing Role: High-stability reference for precision DACs and ADC reference buffers. Use Value: 14 mV max temp drift ensures <0.06% gain error in 200 mV sense signals across −40°C to +85°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACPG4 | 0°C to 70°C operating range; 2% initial tolerance (standard grade) | Limited to commercial-temperature environments; less suitable for industrial enclosures or outdoor deployments | Select when cost sensitivity outweighs temperature range and accuracy requirements |
| TL431BIPG4 | 0.5% initial tolerance at 25°C; same −40°C to +85°C rating | Enables tighter output regulation (±0.5% vs ±1%) in high-precision power rails | Choose for applications requiring improved voltage accuracy without changing PCB layout or thermal design |
Compared with TL431ACPG4 and TL431BIPG4, the TL431AIPG4 balances industrial temperature capability with mid-tier accuracy-making it optimal for cost-constrained yet thermally demanding applications like DIN-rail power supplies and motor drive auxiliaries where 1% tolerance suffices.
Availability
TL431AIPG4 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 long-term manufacturability and traceable sourcing.
Supply support for TL431AIPG4 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 and embedded processing technologies, with decades of expertise in precision analog ICs and power management solutions.
The TL431 product line was designed specifically for high-accuracy voltage regulation in isolated and non-isolated power supplies, offering Zener-diode replacement functionality with superior thermal stability and dynamic performance.
FAQ
What is the reference voltage tolerance of TL431AIPG4 at 25°C?
The TL431AIPG4 has a reference voltage tolerance of ±1% at 25°C, corresponding to a 2.495 V nominal output with a range of 2.470 V to 2.520 V. This A-grade accuracy is confirmed in Section 6.8 of the TI SLVS543S datasheet and applies specifically to the TL431AIPG4 variant in PDIP-8 packaging.
Does TL431AIPG4 support operation at −40°C?
Yes, TL431AIPG4 is rated for operation from −40°C to +85°C (I-grade temperature range). Its electrical characteristics-including reference voltage deviation (VI(dev) ≤14 mV) and dynamic impedance-are fully specified across this range, making it suitable for industrial and outdoor power applications.
What is the maximum cathode current for TL431AIPG4?
The TL431AIPG4 supports a continuous cathode current range of 1 mA to 100 mA per Section 6.4 of the datasheet. Absolute maximum cathode current is ±150 mA, but sustained operation above 100 mA requires thermal derating based on ambient temperature and package thermal resistance (RθJA = 85°C/W for PDIP-8).
Can TL431AIPG4 replace a Zener diode in feedback circuits?
Yes, TL431AIPG4 is explicitly designed as a precision Zener diode replacement. Its active output stage, sharp turn-on, and 0.2 Ω dynamic impedance provide superior regulation accuracy, lower temperature drift, and better load transient response than passive Zeners-especially in isolated flyback and forward converter feedback paths.
What package type is used for TL431AIPG4?
TL431AIPG4 uses the PDIP-8 (plastic dual in-line package) with 8 pins and nominal dimensions of 9.50 mm × 6.35 mm. Pin 1 is Cathode, Pin 2 is Anode, Pin 3 is REF, and Pins 4–8 are NC (no internal connection), as documented in Figure 5-1 and Table 5-1 of the TI datasheet.
TL431AIPG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Series:
- -
- Packaging:
- Tube
- 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:
- ±1%
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
TL431AIPG4 FAQ
1.How can I place an order for TL431AIPG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431AIPG4 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 TL431AIPG4 reliable?
The price and inventory of TL431AIPG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431AIPG4 is usually 5 days.
3.What payment methods are accepted for TL431AIPG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431AIPG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431AIPG4?
TL431AIPG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431AIPG4 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 TL431AIPG4?
For technical support, including TL431AIPG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431AIPG4 requirements.
6.How does Aetrix verify that TL431AIPG4 is sourced from the original manufacturer or authorized distributors?
All TL431AIPG4 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 TL431AIPG4 meets industry standards.
7.What is the process for return or replacement of TL431AIPG4?
All TL431AIPG4 units undergo pre-shipment inspection (PSI). If there is an issue with TL431AIPG4, 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 TL431AIPG4 part is unused and in its original packaging.
Return procedure for TL431AIPG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431AIPG4 Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
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LM4040CYM3-2.5-TR
Microchip Technology
-
LM4040CYM3-4.1-TR
Microchip Technology
-
LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
-
LM4040D20IDBZR
Texas Instruments
-
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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