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Texas Instruments TL431CPSRG4
- Part No.:
- TL431CPSRG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
TL431CPSRG4.pdf
- Description:
- IC VREF SHUNT ADJ 2.2% 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,980
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Product details
Overview
TL431CPSRG4 from Texas Instruments is a precision programmable shunt voltage reference in SOIC-8 package, delivering 2.495 V nominal reference voltage with ±0.5% initial tolerance (B grade) at 25°C, 0°C to 70°C operating range, and 0.2 Ω typical dynamic impedance. It serves as an adjustable feedback element in isolated DC-DC converters and linear regulators for notebook PC power adapters and industrial AC/DC supplies.
For engineers reviewing the TL431CPSRG4 datasheet, TL431CPSRG4 pinout, TL431CPSRG4 application, or TL431CPSRG4 equivalent, key selection criteria include reference accuracy over temperature, cathode current sink capability (1–100 mA), low output noise, and stability under capacitive load conditions up to 100 µF.
Technical Context
The TL431CPSRG4 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 resistor divider. Its sharp turn-on characteristic and active output stage enable Zener diode replacement in closed-loop feedback paths.
It operates as a three-terminal adjustable shunt regulator: REF senses threshold voltage relative to ANODE; CATHODE sinks current to adjust output; ANODE serves as common return. The SOIC-8 package supports thermal dissipation up to 85°C/W junction-to-ambient, enabling stable operation in compact power supply designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V ±12.5 mV (B grade, 25°C); sets precise feedback threshold for output regulation |
| Initial Accuracy | ±0.5% at 25°C; ensures tight output voltage tolerance without trimming in production |
| Temp Range | 0°C to 70°C (C grade); validated for commercial ambient environments in consumer/industrial power supplies |
| Dynamic Impedance | 0.2 Ω typical; minimizes output voltage shift under varying load or line conditions |
| Cathode Current | 1 mA to 100 mA sink capability; supports wide-range feedback loop compensation and drive strength |
| Ref Input Current | 2–4 µA; enables high-impedance resistor dividers (e.g., 100 kΩ–1 MΩ) without significant error |
| Output Noise | Low broadband noise; critical for low-noise LDOs and precision ADC references |
Pinout & Package
TL431CPSRG4 uses an 8-pin SOIC (Small Outline Integrated Circuit) package with 4.90 mm × 3.90 mm body size and standard 1.27 mm pitch. Pin 1 is CATHODE; Pin 2 is ANODE; Pin 3 is REF; Pins 4–8 are NC (no internal connection).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (CATHODE) | Shunt current output node | Sinks regulated current to control external pass device or optocoupler LED; connects to primary-side controller in isolated flyback |
| Pin 2 (ANODE) | Common reference return | Typically tied to system ground or negative rail; defines voltage reference point for REF input |
| Pin 3 (REF) | Threshold sense input | Compares divided output voltage against internal 2.495 V reference; determines regulation setpoint |
| Pins 4–8 | No internal connection | Unused; must remain unconnected per TI specification to avoid parasitic coupling or latch-up |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage range | 2.495 V to 36 V via two-resistor divider - enables single BOM for multiple output rails |
| Low temperature drift | ≤6 mV deviation over 0°C to 70°C - maintains regulation accuracy across ambient shifts |
| Sharp turn-on characteristic | Fast response to REF voltage crossing threshold - prevents oscillation in high-gain feedback loops |
| High sink-current capability | 100 mA max cathode current - drives optocouplers directly without buffer transistors |
| Stability with capacitive loads | Validated up to 100 µF CL - simplifies EMI filter design in secondary-side regulation |
Applications
| Rack Server Power Supply | Industrial AC/DC Converter |
|---|---|
Use Scenario: Secondary-side voltage sensing and feedback in 48 V input, 12 V/50 A isolated DC-DC modules. IC Role / Device Role / Timing Role: Shunt reference providing precise 2.495 V threshold to control optocoupler LED current and regulate primary-side PWM duty cycle. Use Value: Enables ±1% output voltage regulation across line/load/temperature without trimming, reducing test time and calibration cost. | Use Scenario: Output voltage monitoring and overvoltage protection in 3-phase rectified 400 VAC to 24 VDC industrial power supplies. IC Role / Device Role / Timing Role: Adjustable shunt regulator setting trip point for crowbar circuit or supervisor IC input. Use Value: Programmable 2.495–36 V threshold allows reuse across multiple output voltages using same PCB layout. |
| Notebook PC Power Adapter | Servo Drive Control Module |
Use Scenario: Feedback path in 19 V, 3.42 A flyback adapter with synchronous rectification. IC Role / Device Role / Timing Role: Precision reference generating error signal sent via optocoupler to primary-side controller (e.g., UCC28780). Use Value: 0.2 Ω dynamic impedance ensures minimal load-regulation error (<5 mV) during transient load steps. | Use Scenario: Isolated gate driver bias supply regulation and current-sense amplifier reference in 3-phase motor inverters. IC Role / Device Role / Timing Role: Stable 5 V or 3.3 V local reference for analog front-end and ADC sampling circuits. Use Value: Low 2–4 µA REF current enables high-resistance divider networks, minimizing standby power loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431CDBVR | SOT-23-3 package; identical electrical specs but smaller footprint and higher thermal resistance (206°C/W) | Better suited for space-constrained low-power designs; less suitable for >50 mA continuous sink | Select TL431CDBVR only when board area is critical and thermal margin permits |
| TLVH431BIDBVR | Lower 1.24 V reference voltage; 1% initial accuracy; 100 mA sink; optimized for low-voltage systems | Enables direct 1.24–18 V adjustment; not drop-in for 2.5 V–based feedback networks | Choose TLVH431BIDBVR when designing sub-3 V output rails or requiring lower reference headroom |
Compared with TL431CDBVR and TLVH431BIDBVR, TL431CPSRG4 offers superior thermal performance in SOIC-8 for medium-power applications, maintains full compatibility with legacy 2.495 V feedback topologies, and provides tighter initial accuracy than the TLVH431 series while retaining identical functional behavior.
Availability
TL431CPSRG4 is available at Aetrix Electronics and suitable for rack server power, industrial AC/DC converters, and notebook PC power adapter designs requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for TL431CPSRG4 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 expertise in precision reference and power control ICs.
The TL431 product line was designed for high-accuracy, low-drift shunt regulation in isolated and non-isolated power supplies, targeting cost-sensitive yet performance-critical applications across computing, industrial, and consumer markets.
FAQ
What is the reference voltage tolerance of TL431CPSRG4 at 25°C?
The TL431CPSRG4 has a reference voltage tolerance of ±0.5% at 25°C, corresponding to a 2.495 V nominal value with ±12.5 mV deviation. This B-grade accuracy is specified in TI's SLVS543S datasheet Section 6.11 and enables tight output regulation without post-production trimming in TL431CPSRG4-based feedback circuits.
Can TL431CPSRG4 replace a Zener diode in a linear regulator design?
Yes, TL431CPSRG4 can directly replace Zener diodes in linear regulator feedback paths due to its sharp turn-on characteristic, 0.2 Ω dynamic impedance, and adjustable 2.495–36 V output range. Unlike passive Zeners, TL431CPSRG4 provides active regulation with temperature-stable reference voltage and low output drift - verified in TI's Figure 6-1 and Section 3 description.
What is the maximum cathode current sink capability of TL431CPSRG4?
The TL431CPSRG4 supports a continuous cathode current range of 1 mA to 100 mA, as specified in Section 6.4 Recommended Operating Conditions and confirmed in Figure 6-3 of the TI SLVS543S datasheet. This allows direct drive of optocoupler LEDs in isolated power supplies without additional transistor buffering in TL431CPSRG4 implementations.
Does TL431CPSRG4 require external compensation for stability?
TL431CPSRG4 does not require external compensation in most configurations, but stability depends on load capacitance and cathode current. TI's Figure 6-16 shows stable operation up to 100 µF at IKA ≥ 10 mA; for marginal cases, a small series resistor (e.g., 10–100 Ω) between CATHODE and optocoupler anode improves phase margin in TL431CPSRG4 feedback loops.
What is the operating temperature range for TL431CPSRG4?
TL431CPSRG4 is rated for operation from 0°C to 70°C (C grade), as defined in TI's Device Comparison Table and Section 6.4. This commercial temperature range is validated for use in notebook adapters, rack server PSUs, and industrial AC/DC converters where ambient temperatures remain within this envelope - distinct from I-grade (–40°C to 85°C) or Q-grade (–40°C to 125°C) variants.
TL431CPSRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.209", 5.30mm 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:
- ±2.2%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 1 mA
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
TL431CPSRG4 FAQ
1.How can I place an order for TL431CPSRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431CPSRG4 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 TL431CPSRG4 reliable?
The price and inventory of TL431CPSRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431CPSRG4 is usually 5 days.
3.What payment methods are accepted for TL431CPSRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431CPSRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431CPSRG4?
TL431CPSRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431CPSRG4 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 TL431CPSRG4?
For technical support, including TL431CPSRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431CPSRG4 requirements.
6.How does Aetrix verify that TL431CPSRG4 is sourced from the original manufacturer or authorized distributors?
All TL431CPSRG4 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 TL431CPSRG4 meets industry standards.
7.What is the process for return or replacement of TL431CPSRG4?
All TL431CPSRG4 units undergo pre-shipment inspection (PSI). If there is an issue with TL431CPSRG4, 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 TL431CPSRG4 part is unused and in its original packaging.
Return procedure for TL431CPSRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431CPSRG4 Tags
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TL431AIDBZR
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TL431BQDBZR
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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
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