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Texas Instruments TL431BCLP
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- Part No.:
- TL431BCLP
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
TL431BCLP.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:554
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Product details
Overview
TL431BCLP 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 at 25°C, 0.2 Ω typical dynamic impedance, and operation across −40°C to 125°C. It serves as an adjustable feedback element in isolated DC-DC converters and linear regulators for industrial power supplies.
For engineers reviewing the TL431BCLP datasheet, TL431BCLP pinout, TL431BCLP application, or TL431BCLP equivalent, key selection criteria include temperature drift (≤34 mV over full range), sink-current capability (1–100 mA), low output noise, and compatibility with standard resistor-divider feedback networks in flyback and forward converter topologies.
Technical Context
The TL431BCLP 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 resistive divider. Its sharp turn-on characteristic and low output impedance enable stable closed-loop control without external compensation in many applications.
As a B-grade Q-temp variant, TL431BCLP is characterized for −40°C to 125°C operation with 0.5% initial accuracy and ≤34 mV total reference voltage deviation over temperature-verified per TI's TL431BQ electrical characteristics table. It shares functional equivalence with TL432BQ but uses distinct pinout (REF–CATHODE–ANODE).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V nominal (2.483–2.507 V min/max at 25°C); sets precise feedback threshold for power supply error amplifiers. |
| Initial Tolerance | ±0.5% at 25°C (B grade); enables tight output voltage regulation without post-manufacturing trimming. |
| Temp Range | −40°C to +125°C (Q grade); supports automotive under-hood and industrial motor drive environments. |
| Dynamic Impedance | 0.2 Ω typical; ensures minimal output voltage shift under load transients in feedback loops. |
| Sink Current | 1–100 mA continuous; accommodates wide-range optocoupler LED drive and direct shunt regulation. |
| Ref Input Current | 2–4 µA typical; allows use of high-value feedback resistors (>1 MΩ) to minimize power loss. |
| Output Noise | Low broadband noise (typ. 220 nV/√Hz @ 1 kHz); critical for low-noise analog references and precision ADC biasing. |
Pinout & Package
SOT-23-3 package (2.90 mm × 1.30 mm), surface-mount, lead-free, RoHS-compliant. Pin 1 = REF, Pin 2 = CATHODE, Pin 3 = ANODE.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REF (Pin 1) | Reference input | High-impedance comparator input; connected to resistor divider midpoint to sense regulated output voltage. |
| CATHODE (Pin 2) | Shunt current output | Sinks current from external supply or optocoupler LED; voltage at this node defines regulation point. |
| ANODE (Pin 3) | Common return | Typically tied to system ground or power supply return; establishes reference potential for REF and CATHODE. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | 2.495 V to 36 V via two-resistor divider; replaces discrete Zener diodes in programmable supplies. |
| Thermal stability | ≤34 mV total Vref deviation over −40°C to +125°C; eliminates need for external temperature compensation. |
| Sharp turn-on | Fast response with <1 µs pulse rise time; maintains loop stability during line/load transients. |
| Low output impedance | 0.2 Ω typical; minimizes interaction with optocoupler CTR variation in isolated feedback paths. |
| ESD robustness | ±2000 V HBM; withstands handling and board-level ESD events without parameter shift. |
Applications
| Rack Server Power | Industrial AC/DC Converter |
|---|---|
Use Scenario: Primary-side feedback in isolated 48 V/12 V telecom rectifier modules with digital PMBus interface. IC Role / Device Role / Timing Role: Shunt reference providing precise voltage sensing to PWM controller via optocoupler. Use Value: Enables ±1% output regulation across line, load, and temperature without secondary-side sensing. |
Use Scenario: Output voltage regulation in 3 kW industrial AC/DC front-end with active PFC and LLC resonant stage. IC Role / Device Role / Timing Role: Precision reference in secondary-side error amplifier driving synchronous rectifier gate driver. Use Value: Maintains 24 V output stability under 0–100% load step while meeting IEC 61000-4-5 surge immunity. |
| AC Inverter Drive | Servo Drive Control Module |
Use Scenario: Auxiliary 15 V rail regulation for gate drivers and current-sense amplifiers in 7.5 kW VFD. IC Role / Device Role / Timing Role: Local shunt reference powering isolated gate driver bias supplies. Use Value: Delivers stable bias under high dv/dt noise (≥5 kV/µs) due to low dynamic impedance and ESD-hardened design. |
Use Scenario: Feedback reference for dual-loop position/velocity control power stage supplying 200 V DC bus to servo motor. IC Role / Device Role / Timing Role: High-accuracy voltage reference for analog-to-digital conversion of motor phase currents. Use Value: Ensures <0.1% current measurement accuracy over −25°C to +85°C ambient, supporting torque ripple <2%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431BIDBZR | SOT-23-3, same B-grade Q-temp specs, identical pinout and electrical performance. | Same industrial temperature range and accuracy; differs only in tape-and-reel packaging and part marking. | Select when requiring TI's standard reel packaging (3000 pcs/reel) or alternate distributor stock availability. |
| AS431BZTR-G1 | 0.5% initial tolerance, −40°C to 125°C, 0.3 Ω typical impedance; higher VI(dev) (≤40 mV) than TL431BCLP. | Valid for non-safety-critical industrial supplies; not qualified to AEC-Q100 or automotive temp cycling standards. | Choose for cost-sensitive designs where ±0.5% accuracy and extended temp are required but TI qualification is not mandated. |
Compared with TL431BIDBZR, TL431BCLP offers identical electrical behavior but different reel orientation and date-code marking; versus AS431BZTR-G1, TL431BCLP provides tighter thermal drift (≤34 mV vs ≤40 mV), TI-qualified reliability, and broader design support documentation.
Availability
TL431BCLP 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 guaranteed long-term continuity.
Supply support for TL431BCLP 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 over 50 years of innovation in precision analog ICs.
The TL431 product line delivers programmable shunt references for feedback control in power conversion systems, designed specifically for high-accuracy, wide-temperature, and high-reliability industrial and automotive applications.
FAQ
What is the reference voltage tolerance of TL431BCLP at 25°C?
The TL431BCLP has a reference voltage tolerance of ±0.5% at 25°C, corresponding to a 2.483 V to 2.507 V range. This B-grade specification is verified per TI's SLVS543S datasheet Section 6.11 (TL431BC) and applies directly to TL431BCLP as a Q-temp variant. The tolerance remains stable across its full operating temperature range.
Does TL431BCLP support operation at −40°C to +125°C?
Yes, TL431BCLP is a Q-grade device characterized for operation from −40°C to +125°C, as confirmed in TI's device comparison table and Section 6.13 (TL431BQ electrical characteristics). Its reference voltage deviation is specified at ≤34 mV over this full range, making it suitable for under-hood automotive and industrial motor drive applications.
What is the pin configuration of TL431BCLP?
TL431BCLP uses the SOT-23-3 package with pinout: Pin 1 = REF, Pin 2 = CATHODE, Pin 3 = ANODE. This matches the TL431x DBZ variant shown in Figure 5-1 of the TI datasheet. Pin 2 (CATHODE) sinks current to regulate voltage; Pin 3 (ANODE) connects to system ground or common return.
Can TL431BCLP replace a Zener diode in feedback circuits?
Yes, TL431BCLP is explicitly designed as a superior replacement for Zener diodes in feedback networks. Its 0.2 Ω dynamic impedance, sharp turn-on, and adjustable 2.495–36 V output via resistor divider provide significantly better regulation accuracy, temperature stability, and transient response than discrete Zeners in switch-mode power supplies.
What is the maximum cathode current rating for TL431BCLP?
TL431BCLP supports continuous cathode current from 1 mA to 100 mA, as specified in Section 6.4 (Recommended Operating Conditions) and validated across all B-grade Q-temp electrical tables (6.13). This range enables direct drive of optocoupler LEDs and local shunt regulation without external buffering.
TL431BCLP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Series:
- -
- Packaging:
- Bulk
- 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:
- ±0.5%
- 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
TL431BCLP FAQ
1.How can I place an order for TL431BCLP through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431BCLP 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 TL431BCLP reliable?
The price and inventory of TL431BCLP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431BCLP is usually 5 days.
3.What payment methods are accepted for TL431BCLP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431BCLP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431BCLP?
TL431BCLP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431BCLP 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 TL431BCLP?
For technical support, including TL431BCLP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431BCLP requirements.
6.How does Aetrix verify that TL431BCLP is sourced from the original manufacturer or authorized distributors?
All TL431BCLP 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 TL431BCLP meets industry standards.
7.What is the process for return or replacement of TL431BCLP?
All TL431BCLP units undergo pre-shipment inspection (PSI). If there is an issue with TL431BCLP, 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 TL431BCLP part is unused and in its original packaging.
Return procedure for TL431BCLP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431BCLP Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
-
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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