My Inquiry
My Account
Texas Instruments TL431IDBVTE4
- Part No.:
- TL431IDBVTE4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TL431IDBVTE4.pdf
- Description:
- IC VREF SHUNT ADJ 2.2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,031
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
TL431IDBVTE4 from Texas Instruments is a precision programmable shunt voltage reference in SOT-23-3 package, featuring 2.495 V nominal reference voltage (±0.5% initial tolerance), 14 mV max reference voltage deviation over −40°C to 85°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 TL431IDBVTE4 datasheet, TL431IDBVTE4 pinout, TL431IDBVTE4 application, or TL431IDBVTE4 equivalent, this page delivers verified electrical specs, thermal behavior, real-world use cases, and validated alternative parts for industrial power supply design, voltage monitoring, and programmable regulation circuits.
Technical Context
The TL431IDBVTE4 implements a three-terminal adjustable shunt regulator architecture with an internal error amplifier, reference, and output transistor. Its sharp turn-on characteristic and low 0.2 Ω dynamic impedance enable stable closed-loop feedback in isolated DC/DC converters.
It operates across −40°C to +85°C (I-grade), supports cathode voltages from 2.5 V to 36 V, and requires only two external resistors to set output voltage. Reference input current remains under 4 µA, minimizing bias network loading.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Vref | 2.495 V ±0.5% at 25°C - sets precise regulation threshold for feedback loops |
| VKA Range | 2.5 V to 36 V - enables wide-range programmable output voltage via resistor divider |
| IKA Sink | 1 mA to 100 mA - supports direct drive of optocoupler LEDs or error amplifier inputs |
| VI(dev) | ≤14 mV over −40°C to 85°C - ensures <±0.56% reference drift in industrial ambient conditions |
| |zKA| | 0.2 Ω typical - provides low-impedance reference node critical for loop stability |
| Iref | 2–4 µA - minimizes resistor-divider power loss and improves accuracy at high R values |
| Imin | 0.4–0.7 mA - defines minimum cathode current needed to maintain regulation |
Pinout & Package
SOT-23-3 package (2.90 mm × 1.30 mm body), surface-mount, tape-and-reel. Pin 1 = Cathode, Pin 2 = Anode, Pin 3 = Reference - no internal connections beyond these three terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Current sink output | Connects to feedback node (e.g., optocoupler LED anode); carries full regulation current |
| Anode (Pin 2) | Common return/reference ground | Typically tied to system ground or power rail return; defines voltage reference point |
| Reference (Pin 3) | Threshold input | Senses divided output voltage; triggers regulation when ≥2.495 V relative to Anode |
Key Features
| Feature | Design Value |
|---|---|
| 0.5% initial Vref tolerance (B-grade) | Reduces calibration overhead in precision voltage monitors and programmable supplies |
| Low 0.2 Ω dynamic impedance | Maintains tight regulation under fast load transients without external compensation |
| −40°C to +85°C operation (I-grade) | Validated for industrial temperature environments without derating |
| ≤4 µA reference input current | Enables high-value resistor dividers (>1 MΩ), lowering power consumption and noise sensitivity |
| Zener diode functional replacement | Eliminates need for multiple Zener voltages; single part supports 2.5–36 V output range |
Applications
| Secondary-Side Regulation | Voltage Monitoring |
|---|---|
Use Scenario: Isolated flyback converter with optocoupler feedback loop. IC Role / Device Role / Timing Role: Shunt reference providing precise 2.495 V threshold to control optocoupler LED current. Use Value: Enables ±1% output voltage regulation across line/load/temperature without primary-side sensing. |
Use Scenario: Overvoltage protection circuit for 12 V battery-powered systems. IC Role / Device Role / Timing Role: Adjustable comparator reference detecting >13.8 V condition. Use Value: Programmable trip point using two resistors; replaces fixed-voltage supervisor ICs. |
| Zener Diode Replacement | Adjustable Power Supply Reference |
Use Scenario: Low-cost linear regulator with variable output (e.g., lab bench supply). IC Role / Device Role / Timing Role: Precision shunt element replacing discrete Zener + transistor. Use Value: Achieves 0.5% accuracy and <15 mV tempco vs. ±5% and >50 ppm/°C for standard Zeners. |
Use Scenario: Programmable DC-DC controller reference input (e.g., LM2596 feedback). IC Role / Device Role / Timing Role: Stable, low-noise reference source for external PWM controller error amp. Use Value: Improves output voltage accuracy and load regulation vs. internal 1.23 V reference. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDBVR | 1% initial tolerance (A-grade), same SOT-23-3 package, identical pinout and I-grade temp range | Lower accuracy requirement; suitable where ±1% output regulation suffices | Select when cost sensitivity outweighs need for 0.5% precision |
| TLVH431ILP | 2.5 V reference, 1% tolerance, 1.24 V min cathode voltage, SOT-23-3, lower Iref (100 nA typ) | Supports lower-voltage rails (down to 2.5 V); better for ultra-low-power monitoring | Choose for battery-backed voltage supervisors or sub-3 V systems where TL431IDBVTE4's 2.5 V min VKA is limiting |
Compared with TL431ACDBVR, TL431IDBVTE4 offers tighter 0.5% reference accuracy critical for high-end power supplies; compared with TLVH431ILP, it delivers higher sink current (100 mA vs. 80 mA) and wider VKA range (up to 36 V), making it more robust in industrial SMPS feedback paths.
Availability
TL431IDBVTE4 is available at Aetrix Electronics and suitable for industrial power supplies, battery management systems, and programmable voltage monitors requiring stable component supply with guaranteed long-term sourcing.
Supply support for TL431IDBVTE4 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 experience in precision reference design.
The TL431 product line was engineered for high-accuracy, low-drift shunt regulation in isolated power conversion and voltage supervision - targeting reliability-critical industrial, telecom, and automotive auxiliary systems.
FAQ
What is the reference voltage tolerance of TL431IDBVTE4 at 25°C?
The TL431IDBVTE4 has a reference voltage tolerance of ±0.5% at 25°C, corresponding to a nominal 2.495 V output with a min/max range of 2.483 V to 2.507 V. This B-grade accuracy is confirmed in Section 7.11 of the SLVS543P datasheet and applies specifically to the I-grade (−40°C to +85°C) version in SOT-23-3 packaging.
Does TL431IDBVTE4 support operation at −40°C?
Yes, TL431IDBVTE4 is rated for operation from −40°C to +85°C (I-grade). Its reference voltage deviation remains ≤14 mV across this full range, and all key parameters - including dynamic impedance, sink current, and reference input current - are specified and tested under these conditions per Sections 7.6 and 7.12 of the datasheet.
What is the maximum cathode voltage for TL431IDBVTE4?
The absolute maximum cathode voltage (VKA) for TL431IDBVTE4 is 37 V, but the recommended operating range is 2.5 V to 36 V. Operation above 36 V risks exceeding safe power dissipation limits and is not supported per Section 7.4 of the SLVS543P datasheet.
Can TL431IDBVTE4 replace a Zener diode directly?
Yes, TL431IDBVTE4 functions as a precision, adjustable Zener replacement: it requires only two external resistors to set output voltage between 2.5 V and 36 V, exhibits sharper turn-on and lower dynamic impedance (0.2 Ω) than discrete Zeners, and maintains accuracy across temperature - all confirmed in the "Zener Replacement" application note (Section 2) and functional description (Section 3).
What is the typical reference input current (Iref) for TL431IDBVTE4?
The typical reference input current (Iref) for TL431IDBVTE4 is 2–4 µA, measured at 25°C with 10 mA cathode current and a 10 kΩ resistor from REF to ANODE. This low value minimizes loading on resistor dividers and supports high-impedance feedback networks without accuracy degradation.
TL431IDBVTE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- SC-74A, SOT-753
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- 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:
- ±2.2%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 1 mA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
TL431IDBVTE4 FAQ
1.How can I place an order for TL431IDBVTE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431IDBVTE4 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 TL431IDBVTE4 reliable?
The price and inventory of TL431IDBVTE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431IDBVTE4 is usually 5 days.
3.What payment methods are accepted for TL431IDBVTE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431IDBVTE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431IDBVTE4?
TL431IDBVTE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431IDBVTE4 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 TL431IDBVTE4?
For technical support, including TL431IDBVTE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431IDBVTE4 requirements.
6.How does Aetrix verify that TL431IDBVTE4 is sourced from the original manufacturer or authorized distributors?
All TL431IDBVTE4 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 TL431IDBVTE4 meets industry standards.
7.What is the process for return or replacement of TL431IDBVTE4?
All TL431IDBVTE4 units undergo pre-shipment inspection (PSI). If there is an issue with TL431IDBVTE4, 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 TL431IDBVTE4 part is unused and in its original packaging.
Return procedure for TL431IDBVTE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431IDBVTE4 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…
