My Inquiry
My Account
Texas Instruments TL431BCLPME3
,TO-226_bentlead.jpg)
- Part No.:
- TL431BCLPME3
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
TL431BCLPME3.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,142
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
TL431BCLPME3 from Texas Instruments is a precision programmable shunt voltage reference IC in SOT-23-3 package, delivering 2.483–2.507 V reference voltage (0.5% initial tolerance at 25°C), 6 mV max reference voltage drift over 0°C to 70°C, 0.2 Ω typical dynamic impedance, and 1–100 mA sink-current capability. It serves as an adjustable voltage reference or Zener diode replacement in secondary-side regulation of flyback SMPSs.
For engineers reviewing the TL431BCLPME3 datasheet, TL431BCLPME3 pinout, TL431BCLPME3 application, or TL431BCLPME3 equivalent, key selection criteria include its B-grade accuracy, C-temp grade operating range (0°C to 70°C), SOT-23-3 footprint compatibility, and verified performance in closed-loop feedback paths requiring stable 2.5 V thresholding.
Technical Context
The TL431BCLPME3 implements a three-terminal adjustable shunt regulator architecture with an internal error amplifier, reference, and NPN output transistor. Its REF pin senses voltage relative to ANODE, triggering cathode current conduction when the divider ratio exceeds Vref, enabling precise regulation without external op-amps.
It operates as a two-quadrant device: sinking current from cathode to anode when enabled, with sharp turn-on characteristics and low output noise. The SOT-23-3 package supports surface-mount integration in space-constrained power management circuits where thermal resistance (RθJA = 206°C/W) and minimal board area are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Vref | 2.483–2.507 V at 25°C - enables ±0.5% accurate voltage setting for feedback loops |
| VKA Max | 36 V - supports regulation up to 36 V output in adjustable configurations |
| IKA Range | 1–100 mA - provides sufficient sink current for optocoupler biasing and error amplifier drive |
| VI(dev) | ≤6 mV (0°C to 70°C) - ensures <±25 ppm/°C stability in commercial-temperature applications |
| |zKA| | 0.2 Ω typical - delivers low-output-impedance reference for high PSRR in noisy environments |
| Iref | 2–4 µA - minimizes resistor-divider loading error in high-impedance feedback networks |
| Imin | 0.4–0.6 mA - defines minimum cathode current required to maintain regulation |
Pinout & Package
SOT-23-3 package (2.90 mm × 1.30 mm body), surface-mount, lead-free, RoHS-compliant. Pin 1 = Cathode, Pin 2 = Reference, Pin 3 = Anode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Current sink node | Connects to regulated output rail; sinks current to maintain Vref at REF pin |
| Reference (Pin 2) | Threshold input | Senses voltage divider output; triggers conduction when ≥Vref relative to ANODE |
| Anode (Pin 3) | Common return path | Typically tied to system ground or low-side reference; defines voltage reference point for REF |
Key Features
| Feature | Design Value |
|---|---|
| 0.5% initial Vref tolerance (B grade) | Reduces calibration overhead in precision power supplies and voltage monitors |
| 0.2 Ω typical output impedance | Maintains regulation accuracy under varying load conditions in feedback networks |
| 6 mV max Vref drift (0°C to 70°C) | Supports stable operation across commercial temperature range without compensation |
| 1–100 mA sink-current capability | Drives optocouplers directly in isolated SMPS feedback paths without external transistors |
| Low 2–4 µA reference input current | Enables use of high-value feedback resistors, reducing power loss and thermal drift |
Applications
| Secondary-Side Regulation | Zener Diode Replacement |
|---|---|
|
Use Scenario: Feedback control in isolated flyback converters using optocoupler-coupled error signal. IC Role / Device Role / Timing Role: Adjustable shunt reference generating precise error voltage proportional to output deviation. Use Value: Enables ±1% output voltage regulation with minimal external components and no secondary-side controller IC. |
Use Scenario: Voltage clamping and threshold detection in linear regulators and battery protection circuits. IC Role / Device Role / Timing Role: Precision 2.5 V shunt reference replacing discrete Zener diodes with tighter tolerance and lower tempco. Use Value: Improves long-term stability and reduces calibration drift compared to 5% tolerance Zeners. |
| Voltage Monitoring | Comparator with Integrated Reference |
|
Use Scenario: Undervoltage lockout (UVLO) and overvoltage detection in DC power rails. IC Role / Device Role / Timing Role: Programmable threshold detector using external resistor divider on REF pin. Use Value: Eliminates need for separate precision reference and comparator ICs, reducing BOM count and layout area. |
Use Scenario: Simple window comparators or level-shifted logic interfaces in microcontroller peripheral circuits. IC Role / Device Role / Timing Role: Self-contained reference source feeding external comparator inputs or driving analog switches. Use Value: Provides stable 2.5 V reference for hysteresis-setting resistors and eliminates external reference dependency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACLPE3 | 1% initial Vref tolerance (A grade), same SOT-23-3 package and C-temp rating | Lower accuracy requirement; acceptable where ±1% output regulation suffices | Select when cost sensitivity outweighs need for 0.5% precision |
| TL431BIDBVR | B grade (0.5%) but I-temp rating (−40°C to 85°C); SOT-23-3 package | Extended temperature operation required for industrial or automotive ambient conditions | Choose for designs needing wider operating range without sacrificing accuracy |
Compared with TL431ACLPE3, TL431BCLPME3 offers tighter initial tolerance for improved system-level accuracy; compared with TL431BIDBVR, it trades extended temperature range for lower cost and optimized performance in commercial environments.
Availability
TL431BCLPME3 is available at Aetrix Electronics and suitable for secondary-side regulation in flyback SMPSs, voltage monitoring in industrial power supplies, and Zener replacement in embedded voltage-reference circuits requiring stable component supply and full traceability.
Supply support for TL431BCLPME3 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 precision analog ICs and power management solutions.
The TL431 product line delivers programmable shunt references designed for high-accuracy voltage regulation in isolated and non-isolated power supplies, instrumentation, and safety-critical feedback systems.
FAQ
What is the reference voltage tolerance of TL431BCLPME3 at 25°C?
The TL431BCLPME3 has a reference voltage tolerance of ±0.5% at 25°C, corresponding to a Vref range of 2.483 V to 2.507 V under standard test conditions (VKA = Vref, IKA = 10 mA). This B-grade specification is confirmed in Section 7.11 of the SLVS543P datasheet and defines its high-accuracy classification within the TL431 family.
What temperature range is TL431BCLPME3 rated for?
TL431BCLPME3 is a C-temp grade device, characterized for operation from 0°C to 70°C. Its reference voltage drift is specified at ≤6 mV over this full range, making it suitable for commercial-grade power supplies and embedded systems without extended thermal requirements.
What package type does TL431BCLPME3 use?
TL431BCLPME3 uses the SOT-23-3 package (2.90 mm × 1.30 mm nominal body size), with pin 1 = Cathode, pin 2 = Reference, and pin 3 = Anode. This is explicitly listed in the Device Information table and confirmed in the Pin Configuration section of the TI datasheet SLVS543P.
Can TL431BCLPME3 replace a Zener diode in voltage reference circuits?
Yes, TL431BCLPME3 is explicitly designed as a Zener diode replacement, offering superior initial accuracy (0.5% vs. typical 5%), lower temperature drift (6 mV vs. >50 mV), and adjustable output (2.5 V to 36 V) via two external resistors. Its sharp turn-on and 0.2 Ω dynamic impedance make it ideal for precision referencing where Zeners fall short.
What is the maximum cathode-to-anode voltage for TL431BCLPME3?
The absolute maximum cathode-to-anode voltage (VKA) for TL431BCLPME3 is 37 V, with recommended operating limit of 36 V. This rating is defined in Section 7.1 (Absolute Maximum Ratings) of the SLVS543P datasheet and applies across all temperature grades and packages.
TL431BCLPME3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Series:
- -
- Packaging:
- Bulk
- 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:
- ±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
TL431BCLPME3 FAQ
1.How can I place an order for TL431BCLPME3 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431BCLPME3 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 TL431BCLPME3 reliable?
The price and inventory of TL431BCLPME3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431BCLPME3 is usually 5 days.
3.What payment methods are accepted for TL431BCLPME3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431BCLPME3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431BCLPME3?
TL431BCLPME3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431BCLPME3 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 TL431BCLPME3?
For technical support, including TL431BCLPME3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431BCLPME3 requirements.
6.How does Aetrix verify that TL431BCLPME3 is sourced from the original manufacturer or authorized distributors?
All TL431BCLPME3 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 TL431BCLPME3 meets industry standards.
7.What is the process for return or replacement of TL431BCLPME3?
All TL431BCLPME3 units undergo pre-shipment inspection (PSI). If there is an issue with TL431BCLPME3, 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 TL431BCLPME3 part is unused and in its original packaging.
Return procedure for TL431BCLPME3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431BCLPME3 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
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
