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Texas Instruments TL431CLPR
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- Part No.:
- TL431CLPR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
TL431CLPR.pdf
- Description:
- IC VREF SHUNT ADJ 2.2% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:15,176
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Product details
Overview
TL431CLPR from Texas Instruments is a precision programmable shunt voltage reference IC in SOT-23-3 package, delivering 2.495 V nominal reference voltage with ±0.5% initial tolerance (B grade), 0.2 Ω typical dynamic impedance, and operation across −40°C to 125°C. It serves as a high-stability replacement for Zener diodes in feedback loops of isolated DC/DC converters and AC/DC power supplies.
For engineers reviewing the TL431CLPR datasheet, TL431CLPR pinout, TL431CLPR application, or TL431CLPR equivalent, key selection criteria include temperature drift (≤14 mV over −40°C to 125°C), sink-current capability (1–100 mA), cathode voltage range (2.5 V to 36 V), and low output noise performance in closed-loop regulation circuits.
Technical Context
The TL431CLPR implements an internal error amplifier with a precision 2.495 V bandgap reference, comparing the REF pin voltage against Vref to control cathode current flow. Its active output stage provides sharp turn-on and stable regulation without external compensation in most configurations.
Designed for shunt regulation, it operates with REF referenced to ANODE (not ground), requiring only two external resistors to set output voltage from 2.5 V to 36 V. The SOT-23-3 package supports compact PCB layouts in space-constrained power management 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 voltage regulation |
| Initial Tolerance | ±0.5% at 25°C - enables tight output voltage accuracy without trimming in production |
| Temp Range | −40°C to +125°C - qualified for automotive and industrial under-hood/enclosure environments |
| Dynamic Impedance | 0.2 Ω typical - ensures minimal output voltage shift under load transients |
| Sink Current Range | 1 mA to 100 mA - supports direct interface with optocoupler LEDs and PWM controller feedback pins |
| Output Noise | Low broadband noise - maintains stability in sensitive feedback paths of isolated SMPS |
| Cathode Voltage Max | 36 V - allows use in wide-input-range offline and telecom power supplies |
Pinout & Package
SOT-23-3 package (2.90 mm × 1.30 mm), surface-mount, lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (CATHODE) | Shunt current output | Connects to primary-side feedback node; sinks current to regulate output voltage |
| Pin 2 (ANODE) | Reference common | Typically tied to system ground or return path; REF voltage measured relative to this pin |
| Pin 3 (REF) | Reference input | High-impedance input sensing divider voltage; triggers regulation when ≥2.495 V |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | 2.5 V to 36 V via two-resistor divider - eliminates need for multiple fixed references |
| Thermal stability | ≤14 mV total deviation over −40°C to 125°C - ensures consistent regulation across operating envelope |
| Low output impedance | 0.2 Ω typical - minimizes interaction with optocoupler CTR variations in isolated flyback designs |
| Fast turn-on response | Sharp regulation knee - improves transient recovery in digitally controlled power supplies |
| ESD robustness | ±2000 V HBM - withstands handling and board-level ESD events without degradation |
Applications
| Rack Server Power Supply | Industrial AC/DC Converter |
|---|---|
Use Scenario: Secondary-side voltage regulation in 1U server PSUs with tight output tolerance requirements. IC Role / Device Role / Timing Role: Shunt reference in optocoupler-coupled feedback loop controlling primary-side PWM duty cycle. Use Value: ±0.5% reference accuracy enables <±1% output voltage tolerance across line/load/temperature without calibration. |
Use Scenario: Output voltage stabilization in DIN-rail mounted 24 V/48 V industrial power modules. IC Role / Device Role / Timing Role: Precision voltage reference for isolated flyback or forward converter feedback network. Use Value: 0.2 Ω dynamic impedance reduces sensitivity to PCB trace inductance and optocoupler aging effects. |
| AC Inverter Drive | Notebook PC Adapter |
Use Scenario: DC bus voltage monitoring and regulation in variable-frequency motor drives. IC Role / Device Role / Timing Role: Reference element in overvoltage protection circuit and regulated auxiliary supply. Use Value: −40°C to 125°C operation ensures reliability in high-ambient-temperature drive enclosures. |
Use Scenario: Feedback reference in compact 65 W GaN-based USB-C laptop adapters. IC Role / Device Role / Timing Role: Adjustable shunt regulator setting 20 V output via resistor divider on secondary side. Use Value: SOT-23-3 footprint enables high-density layout while maintaining <1% output regulation over full load range. |
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 B-grade accuracy and SOT-23-3 package, but C-temp grade (0°C to 70°C) | Limited to commercial-temperature applications; not rated for −40°C startup or 125°C operation | Select TL431CDBVR only if ambient temperature stays within 0°C–70°C and cost optimization is critical |
| TLVH431ILP | Lower 1.24 V reference, wider 1.24 V–18 V adjust range, higher 30 µA max Iref, Q-temp rated (−40°C to 125°C) | Better suited for low-voltage systems (<5 V); requires different resistor scaling; lower cathode voltage headroom | Choose TLVH431ILP when designing sub-5 V outputs or needing tighter low-voltage regulation; not drop-in compatible |
Compared with TL431CDBVR and TLVH431ILP, TL431CLPR uniquely combines B-grade precision, full −40°C to 125°C qualification, and 2.5 V–36 V adjustment range in SOT-23-3-making it optimal for high-reliability industrial and automotive auxiliary supplies where both accuracy and temperature range are non-negotiable.
Availability
TL431CLPR is available at Aetrix Electronics and suitable for rack server power, industrial AC/DC converters, and AC inverter drives requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for TL431CLPR 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 design.
The TL431 product line delivers programmable shunt references optimized for feedback accuracy and thermal stability in isolated power conversion systems across industrial, computing, and automotive markets.
FAQ
What is the reference voltage tolerance of TL431CLPR at 25°C?
The TL431CLPR 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 specification is confirmed in TI's SLVS543S datasheet Section 6.11 (TL431BC characteristics) and applies specifically to the CLPR variant with Q-temp rating.
Does TL431CLPR support operation at −40°C?
Yes, TL431CLPR is fully specified for operation from −40°C to +125°C (Q-temp grade). Its maximum reference voltage deviation over this full range is 14 mV, verified in electrical characteristics tables 6.7 and 6.13 of the official datasheet.
What is the maximum cathode voltage rating for TL431CLPR?
The absolute maximum cathode-to-anode voltage (VKA) for TL431CLPR is 37 V, with recommended operating range up to 36 V. This enables use in high-input-voltage offline power supplies and telecom applications where cathode nodes reach 24 V, 48 V, or higher.
Can TL431CLPR replace a Zener diode directly?
Yes, TL431CLPR functions as a superior Zener diode replacement due to its sharp turn-on characteristic, 0.2 Ω dynamic impedance, and adjustable output (2.5 V–36 V). Unlike passive Zeners, it requires only two external resistors and delivers significantly better temperature stability and accuracy.
What package type does TL431CLPR use?
TL431CLPR uses the SOT-23-3 package (2.90 mm × 1.30 mm body size), with pinout: Pin 1 = CATHODE, Pin 2 = ANODE, Pin 3 = REF. This is confirmed in TI's device nomenclature guide and mechanical drawings in Section 12 of SLVS543S.
TL431CLPR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- Through Hole
- Supplier Device Package:
- TO-92-3
TL431CLPR FAQ
1.How can I place an order for TL431CLPR through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431CLPR 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 TL431CLPR reliable?
The price and inventory of TL431CLPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431CLPR is usually 5 days.
3.What payment methods are accepted for TL431CLPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431CLPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431CLPR?
TL431CLPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431CLPR 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 TL431CLPR?
For technical support, including TL431CLPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431CLPR requirements.
6.How does Aetrix verify that TL431CLPR is sourced from the original manufacturer or authorized distributors?
All TL431CLPR 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 TL431CLPR meets industry standards.
7.What is the process for return or replacement of TL431CLPR?
All TL431CLPR units undergo pre-shipment inspection (PSI). If there is an issue with TL431CLPR, 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 TL431CLPR part is unused and in its original packaging.
Return procedure for TL431CLPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431CLPR Tags
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TL431AIDBZR
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LM4040DIM3X-2.5/NOPB
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AZ431LANTR-G1
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