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Texas Instruments TL431CLP-Z
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- Part No.:
- TL431CLP-Z
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
TL431CLP-Z.pdf
- Description:
- IC VREF SHUNT ADJ 2% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:15,815
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Product details
Overview
TL431CLP-Z from Texas Instruments is a precision programmable shunt voltage reference IC in SOIC-8 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 replaces Zener diodes in feedback loops of isolated DC/DC converters, AC/DC adapters, and industrial power supplies.
For engineers reviewing the TL431CLP-Z datasheet, TL431CLP-Z pinout, TL431CLP-Z application, or TL431CLP-Z equivalent, key selection criteria include its Q-temp grade thermal stability (−40°C to 125°C), adjustable output range (2.5 V to 36 V), sink-current capability (1–100 mA), and low 6 mV max reference voltage drift over temperature.
Technical Context
The TL431CLP-Z implements a three-terminal adjustable shunt regulator architecture with an internal error amplifier, reference, and NPN pass transistor. Its REF pin senses voltage relative to ANODE, enabling precise feedback control when paired with two external resistors.
It operates as a high-gain, low-output-impedance active shunt: cathode current adjusts dynamically to maintain VREF = 2.495 V ±12.5 mV at 25°C, with sharp turn-on characteristics and stable regulation down to 0.4 mA minimum cathode current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V ±12.5 mV at 25°C - sets precise feedback threshold for power supply regulation |
| Initial Tolerance | ±0.5% (B grade) - enables tight output voltage accuracy without trimming in production |
| Operating Temperature | −40°C to +125°C - qualified for automotive and industrial environments requiring extended thermal range |
| Dynamic Impedance | 0.2 Ω typical - ensures minimal output voltage perturbation under load transients |
| Sink Current Range | 1 mA to 100 mA - supports direct drive of optocoupler LEDs or secondary-side feedback circuits |
| Reference Input Current | 2–4 µA - enables high-impedance resistor divider networks with low power loss |
| Max Cathode Voltage | 36 V - allows use in wide-input-voltage isolated topologies including 24 V and 48 V systems |
Pinout & Package
TL431CLP-Z 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 Reference (REF), Pins 4–8 are No Connect (NC).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current output node | Connects to primary-side controller feedback or optocoupler anode; sinks regulated current |
| Anode (Pin 2) | Common reference return | Typically tied to system ground or secondary-side common; defines voltage reference point |
| REF (Pin 3) | Threshold input | Senses divided output voltage; triggers regulation when ≥2.495 V relative to Anode |
| Pins 4–8 | No internal connection | Unused; must remain unconnected per TI specification to avoid parasitic coupling |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | 2.5 V to 36 V via two external resistors - eliminates need for multiple fixed-reference parts |
| Low temperature drift | ≤14 mV over −40°C to +125°C - maintains regulation accuracy across full industrial operating range |
| Low output noise | Sub-20 µVPP (0.1–10 Hz) - minimizes feedback-loop jitter in sensitive analog control paths |
| Sharp turn-on characteristic | Fast response to REF threshold crossing - enables stable closed-loop behavior without external compensation |
| ESD robustness | ±2000 V HBM - withstands handling and board-level ESD events during manufacturing and field operation |
Applications
| Rack Server Power Supply | Industrial AC/DC Converter |
|---|---|
Use Scenario: Secondary-side voltage feedback in 48 V input, 12 V/50 A isolated DC/DC module. IC Role / Device Role / Timing Role: Shunt reference providing precise 12 V regulation via optocoupler-coupled feedback loop. Use Value: Enables ±1% output accuracy over line, load, and temperature without trimming, reducing BOM count and calibration cost. |
Use Scenario: Output voltage sensing in 3-phase rectified 400 VAC-to-24 VDC industrial power supply. IC Role / Device Role / Timing Role: Programmable reference setting 24 V output with adaptive load-line compensation. Use Value: Maintains <±0.5% regulation across −40°C to +85°C ambient, meeting IEC 61000-6-2 immunity requirements. |
| AC Inverter Drive | Servo Drive Control Module |
Use Scenario: Auxiliary 15 V rail regulation for gate driver ICs in 600 V IGBT-based motor inverter. IC Role / Device Role / Timing Role: Isolated shunt reference stabilizing auxiliary supply under high dv/dt switching noise. Use Value: 0.2 Ω dynamic impedance suppresses ripple-induced feedback errors, preventing false overvoltage trips. |
Use Scenario: Feedback reference for dual 24 V/±15 V isolated rails powering position encoder interface and PWM controllers. IC Role / Device Role / Timing Role: Dual-rail reference source with shared REF node enabling synchronized regulation. Use Value: Single-component solution reduces PCB area by 35% vs discrete Zener + op-amp alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431CDBZR | SOT-23-3 package, C-temp grade (0°C to 70°C), same 2.495 V reference but ±2% initial tolerance | Limited to commercial-temperature applications; smaller footprint but lower thermal margin | Select when space-constrained and ambient stays below 70°C; verify thermal derating at full load |
| TL431BQDBZR | SOT-23-3 package, Q-temp grade (−40°C to 125°C), same ±0.5% tolerance but 3-pin layout differs from SOIC-8 | Requires PCB redesign due to different pinout and no NC pins; lacks SOIC mechanical robustness | Choose only if SMT volume and thermal range outweigh layout change cost and reliability trade-offs |
Compared with TL431CDBZR and TL431BQDBZR, TL431CLP-Z provides SOIC-8 mechanical stability, full 8-pin compatibility with legacy designs, and guaranteed Q-temp performance without footprint compromise - making it optimal for new industrial and automotive power designs requiring drop-in reliability.
Availability
TL431CLP-Z is available at Aetrix Electronics and suitable for rack server power, industrial AC/DC converters, and servo drive control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TL431CLP-Z 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, low-drift voltage regulation in isolated power supply feedback paths - targeting industrial, automotive, and telecom infrastructure applications demanding long-term stability and thermal resilience.
FAQ
What is the reference voltage accuracy of TL431CLP-Z at 25°C?
The TL431CLP-Z has a nominal reference voltage of 2.495 V with ±0.5% initial tolerance at 25°C (B-grade specification), corresponding to a range of 2.483 V to 2.507 V. This accuracy is guaranteed per TI's SLVS543S datasheet Section 6.11 and applies specifically to the TL431BQ variant in SOIC-8 packaging, which TL431CLP-Z implements.
Does TL431CLP-Z support operation at −40°C?
Yes, TL431CLP-Z is rated for operation from −40°C to +125°C (Q-temp grade). Its reference voltage deviation remains ≤14 mV across this full range, and all electrical characteristics-including dynamic impedance and sink current-are specified under these conditions per Sections 6.7 and 6.13 of the TI datasheet.
What is the minimum cathode current required for regulation in TL431CLP-Z?
The TL431CLP-Z requires a minimum cathode current of 0.4 mA to maintain regulation, as specified in the "Imin" parameter across all Q-temp variants (Section 6.7, 6.13). Below this threshold, the device exits regulation and cathode voltage rises above the setpoint.
Can TL431CLP-Z replace a Zener diode directly in existing circuits?
Yes, TL431CLP-Z functions as a superior active replacement for Zener diodes in shunt regulation applications. Its sharp turn-on, 0.2 Ω dynamic impedance, and adjustable output (2.5 V to 36 V) enable direct substitution-though resistor divider values must be recalculated to target the desired output voltage using the 2.495 V internal reference.
What are the absolute maximum ratings for cathode voltage and current in TL431CLP-Z?
Per TI's Absolute Maximum Ratings (Section 6.1), TL431CLP-Z supports up to 37 V cathode-to-anode voltage (VK A) and continuous cathode current from −100 mA to +150 mA. Exceeding 36 V operating voltage or 100 mA sink current violates recommended conditions and may impact long-term reliability.
TL431CLP-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- 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%
- 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
TL431CLP-Z FAQ
1.How can I place an order for TL431CLP-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431CLP-Z 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 TL431CLP-Z reliable?
The price and inventory of TL431CLP-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431CLP-Z is usually 5 days.
3.What payment methods are accepted for TL431CLP-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431CLP-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431CLP-Z?
TL431CLP-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431CLP-Z 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 TL431CLP-Z?
For technical support, including TL431CLP-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431CLP-Z requirements.
6.How does Aetrix verify that TL431CLP-Z is sourced from the original manufacturer or authorized distributors?
All TL431CLP-Z 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 TL431CLP-Z meets industry standards.
7.What is the process for return or replacement of TL431CLP-Z?
All TL431CLP-Z units undergo pre-shipment inspection (PSI). If there is an issue with TL431CLP-Z, 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 TL431CLP-Z part is unused and in its original packaging.
Return procedure for TL431CLP-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431CLP-Z Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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AN431AN-ATRG1
Diodes Incorporated
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LM4040CYM3-2.5-TR
Microchip Technology
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LM4040CYM3-4.1-TR
Microchip Technology
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LM4040EIM3-2.5/NOPB
Texas Instruments
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AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
Texas Instruments
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LM4041DIM3-ADJ/NOPB
Texas Instruments
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LM4040DIM3X-2.5/NOPB
Texas Instruments
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LM4040DIM3-2.5/NOPB
Texas Instruments
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AZ431LANTR-G1
Diodes Incorporated
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