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Texas Instruments TL431ACLPR
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- Part No.:
- TL431ACLPR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
TL431ACLPR.pdf
- Description:
- IC VREF SHUNT ADJ 1% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:6,256
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Product details
Overview
TL431ACLPR from Texas Instruments is a precision programmable shunt voltage reference IC with 1% initial tolerance at 25°C, adjustable output 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 6 mV temperature drift (I-grade), enabling high-accuracy feedback in isolated DC-DC converters.
For engineers reviewing the TL431ACLPR datasheet, TL431ACLPR pinout, TL431ACLPR application, or TL431ACLPR equivalent, this page provides verified electrical specs, SOT-23-3 package details, thermal performance data, and validated alternative parts for industrial power supply design and voltage monitoring circuits.
Technical Context
The TL431ACLPR implements an internal 2.495 V bandgap reference with high-gain error amplifier and NPN output stage, configured as a three-terminal adjustable shunt regulator. Its sharp turn-on characteristic and low output impedance enable Zener diode replacement in closed-loop feedback paths.
It operates in continuous conduction mode with cathode-to-anode voltage range up to 36 V and requires ≥0.4 mA minimum cathode current for regulation. The device exhibits stable small-signal gain (≥40 dB up to 10 kHz) and low 1/f noise (<1 µV peak-to-peak over 0.1–10 Hz), critical for precision analog control loops.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V ±1% at 25°C - sets precise feedback threshold for power supply regulation |
| Temp Range | −40°C to +85°C - supports industrial ambient conditions without derating |
| Dynamic Impedance | 0.2 Ω typical - ensures minimal output voltage shift under load transients |
| Sink Current Range | 1 mA to 100 mA - accommodates wide-range feedback loop compensation and optocoupler drive |
| Temp Drift (VI(dev)) | 14 mV max over full range - guarantees ≤0.05% output variation across operating temperature |
| Ref Input Current | 2–4 µA - enables high-impedance resistor-divider networks without loading error |
| Off-State Cathode Leakage | ≤0.5 µA at 36 V - maintains low quiescent current in standby modes |
Pinout & Package
SOT-23-3 package (2.90 mm × 1.30 mm), surface-mount, lead-free, RoHS-compliant. Pin 1 = Cathode, Pin 2 = Reference, 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 pin |
| Reference (Pin 2) | Threshold sensing input | Compares external resistor-divider voltage against internal 2.495 V reference; controls cathode conduction |
| Anode (Pin 3) | Common return path | Typically tied to system ground or low-side return; defines voltage reference point for REF and CATHODE |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Output Range | 2.495 V to 36 V via two external resistors - eliminates need for multiple fixed-voltage references |
| Low Dynamic Impedance | 0.2 Ω typical - minimizes output voltage deviation during fast load steps in SMPS feedback |
| High Sink Current Capability | 100 mA max - directly drives optocoupler LEDs or transistor bases without external buffer |
| Low Temperature Drift | 14 mV max over −40°C to +85°C - ensures stable regulation across industrial thermal cycles |
| Low Input Bias Current | 2–4 µA - permits use of >1 MΩ resistor dividers, reducing power loss and noise sensitivity |
Applications
| Rack Server Power Supply | Industrial AC/DC Converter |
|---|---|
Use Scenario: Primary-side feedback in isolated 48 V/12 V telecom rectifiers with optocoupler isolation. IC Role / Device Role / Timing Role: Shunt reference providing precise 2.495 V threshold to control optocoupler LED current and regulate secondary output voltage. Use Value: Enables ±1% output accuracy over line/load/temperature while supporting 100 kHz switching frequencies. |
Use Scenario: Voltage monitoring and overvoltage protection in 3-phase motor drive front-end supplies. IC Role / Device Role / Timing Role: Adjustable shunt reference setting trip point for comparator-based OVP circuitry. Use Value: Configurable 2.495–36 V threshold allows single BOM part to cover multiple rail voltages (e.g., 24 V, 48 V, 72 V). |
| AC Inverter VF Drive | Servo Drive Control Module |
Use Scenario: Feedback stabilization in boost PFC stage of variable-frequency HVAC inverters. IC Role / Device Role / Timing Role: Precision reference for error amplifier in voltage-mode PFC controller IC feedback loop. Use Value: 0.2 Ω dynamic impedance prevents phase margin erosion at crossover frequency, ensuring stable 50–100 kHz operation. |
Use Scenario: Isolated auxiliary supply regulation for gate driver ICs in servo motor power stages. IC Role / Device Role / Timing Role: Secondary-side shunt reference regulating 15 V isolated bias rail feeding IGBT drivers. Use Value: 100 mA sink capacity supports simultaneous drive of multiple high-Ciss gate drivers without droop. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431CDBVR | 0°C to 70°C temp range; 2% initial tolerance; same SOT-23-3 package and pinout | Limited to commercial-temperature environments; less suitable for industrial enclosures with thermal cycling | Select when cost sensitivity outweighs temperature stability requirements and ambient stays <70°C |
| TL431BIDBVR | 0.5% initial tolerance; −40°C to 85°C; identical SOT-23-3 footprint and electrical interface | Higher accuracy enables tighter regulation in battery-powered test equipment and precision instrumentation | Choose for applications requiring <±0.5% output tolerance over full industrial temperature range |
Compared with TL431ACLPR, TL431CDBVR trades accuracy and temperature range for lower cost, while TL431BIDBVR improves initial tolerance by 0.5% without changing layout or thermal design-making it ideal for upgrading existing designs needing tighter regulation.
Availability
TL431ACLPR is available at Aetrix Electronics and suitable for rack server power supplies, industrial AC/DC converters, and servo drive control modules requiring stable component supply with guaranteed long-term continuity.
Supply support for TL431ACLPR 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 company specializing in analog and embedded processing technologies, with leadership in power management, signal chain, and high-reliability components.
The TL431 family was designed as a precision programmable shunt reference for feedback control in isolated switch-mode power supplies, replacing discrete Zener diodes with superior accuracy, stability, and sink-current capability.
FAQ
What is the reference voltage tolerance of TL431ACLPR at 25°C?
The TL431ACLPR has a reference voltage tolerance of ±1% at 25°C, corresponding to a 2.495 V nominal output with minimum 2.470 V and maximum 2.520 V. This A-grade specification is confirmed in Section 6.8 of the TI SLVS543S datasheet and applies specifically to the TL431ACLPR variant with SOT-23-3 packaging and I-grade temperature rating.
Does TL431ACLPR support operation at −40°C?
Yes, TL431ACLPR is rated for operation from −40°C to +85°C (I-grade). Its electrical characteristics-including reference voltage deviation (VI(dev) ≤14 mV), reference input current (II(dev) ≤2.5 µA), and dynamic impedance-are fully specified across this extended industrial temperature range per Section 6.9 of the official TI datasheet.
What package type does TL431ACLPR use?
TL431ACLPR uses the SOT-23-3 surface-mount package (body size 2.90 mm × 1.30 mm), with pin 1 = Cathode, pin 2 = Reference, and pin 3 = Anode. This is explicitly listed in TI's orderable addendum and confirmed in the "Device Information" table on page 2 of SLVS543S.
Can TL431ACLPR replace a standard Zener diode in feedback circuits?
Yes, TL431ACLPR is engineered as a direct functional replacement for Zener diodes in voltage regulation feedback paths. Its sharp turn-on characteristic, 0.2 Ω dynamic impedance, and adjustable 2.495–36 V output via external resistors provide superior accuracy, stability, and design flexibility compared to discrete Zeners-especially in isolated SMPS topologies.
What is the minimum cathode current required for regulation in TL431ACLPR?
The TL431ACLPR requires a minimum cathode current of 0.4 mA to maintain regulation, as specified in Sections 6.8–6.10 of the TI datasheet. This value remains consistent across all temperature grades (C/I/Q) and tolerances (A/B/standard), ensuring reliable startup and regulation in low-power auxiliary supplies.
TL431ACLPR 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:
- ±1%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 600 µA
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
TL431ACLPR FAQ
1.How can I place an order for TL431ACLPR through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431ACLPR 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 TL431ACLPR reliable?
The price and inventory of TL431ACLPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431ACLPR is usually 5 days.
3.What payment methods are accepted for TL431ACLPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431ACLPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431ACLPR?
TL431ACLPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431ACLPR 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 TL431ACLPR?
For technical support, including TL431ACLPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431ACLPR requirements.
6.How does Aetrix verify that TL431ACLPR is sourced from the original manufacturer or authorized distributors?
All TL431ACLPR 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 TL431ACLPR meets industry standards.
7.What is the process for return or replacement of TL431ACLPR?
All TL431ACLPR units undergo pre-shipment inspection (PSI). If there is an issue with TL431ACLPR, 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 TL431ACLPR part is unused and in its original packaging.
Return procedure for TL431ACLPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431ACLPR Tags
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LM4040DIM3X-2.5/NOPB
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AZ431LANTR-G1
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