My Inquiry
My Account
Texas Instruments TLV431BILPR
,TO-226_bentlead.jpg)
- Part No.:
- TLV431BILPR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
TLV431BILPR.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,043
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
TLV431BILPR from Texas Instruments is a low-voltage adjustable precision shunt regulator with 0.5% reference voltage tolerance at 25°C, 1.24V nominal VREF, and operation down to 1.24V cathode-anode voltage. It delivers 0.25Ω typical dynamic impedance, 80µA typical minimum cathode current, and supports output voltage adjustment from 1.24V to 6V using two external resistors - ideal for secondary-side regulation in compact 3.3V isolated flyback SMPSs.
For engineers reviewing the TLV431BILPR datasheet, TLV431BILPR pinout, TLV431BILPR application, or TLV431BILPR equivalent, key selection considerations include its SC-70 (DCK) package footprint, temperature-stable 11mV VREF deviation over –40°C to 125°C, ultra-low Iref (0.1–0.5µA), and compatibility with optocoupler-based feedback loops requiring sharp turn-on and no external compensation.
Technical Context
The TLV431BILPR integrates a precision 1.24V bandgap reference and high-gain NPN-based error amplifier in a single die, enabling closed-loop shunt regulation or open-loop comparator operation. Its internal Darlington sink stage provides fast turn-on and stable regulation without output capacitance, unlike many linear regulators.
It operates across –40°C to 125°C (Q-grade), with specified VREF deviation of 11mV and Iref deviation of 0.15µA max over full temperature range. The device requires ≥55µA cathode current to enter regulation and maintains <0.4Ω dynamic impedance up to 15mA cathode current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF @ 25°C | 1.24 V ±0.5% - enables precise low-voltage setpoints with minimal calibration overhead |
| VREF Deviation (–40°C to 125°C) | 11 mV - ensures stable reference under automotive/industrial thermal stress |
| Dynamic Impedance |zKA| | 0.25 Ω typical - minimizes output voltage ripple under load transients |
| Min Cathode Current (IK(min)) | 55 µA - allows regulation in ultra-low-power systems where TL431 (1mA) fails |
| Reference Terminal Current (Iref) | 0.1–0.5 µA - reduces resistor-divider power loss and improves accuracy in high-impedance feedback networks |
| Cathode Voltage Range (VKA) | 1.24 V to 6 V - supports direct replacement of Zener diodes and flexible output scaling |
| ESD Rating (HBM) | ±2000 V - meets industrial handling requirements without additional protection circuitry |
Pinout & Package
TLV431BILPR is packaged in an ultra-small SC-70 (DCK) case measuring 2.0 mm × 1.5 mm - 40% smaller than SOT-23-3 - with 6 pins and a substrate-connected pin requiring connection to ANODE or left floating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE (Pin 1) | Shunt current input/output | Sinks regulated current; connects to supply rail or optocoupler LED anode in feedback loops |
| REF (Pin 3) | Reference voltage sense input | High-impedance node tied to resistor divider; must draw ≥0.1µA for proper biasing |
| ANODE (Pin 6) | Common return path | Typically grounded; serves as reference point for VKA and Iref measurements |
| NC (Pins 4, 5) | No internal connection | Unused; must remain unconnected per TI specification |
| Substrate (Pin 2) | Die attachment pad | Must be connected to ANODE or left open - not tied to PCB ground independently |
Key Features
| Feature | Design Value |
|---|---|
| 0.5% VREF tolerance at 25°C | Reduces system-level calibration burden in precision voltage monitoring and closed-loop SMPS designs |
| SC-70 (DCK) package | Enables high-density PCB layouts in space-constrained applications like USB-C PD adapters and IoT power modules |
| Stable without output capacitor | Eliminates need for stability-compensating capacitors - simplifies BOM and layout in isolated feedback paths |
| Open-loop comparator mode | Provides integrated 1.24V reference + high-gain comparison for undervoltage lockout (UVLO) and fault detection |
| –40°C to 125°C operation | Qualified for under-hood automotive and industrial control environments without derating |
Applications
| Isolated Flyback Secondary Regulation | Zener Diode Replacement |
|---|---|
|
Use Scenario: Regulating 3.3V output in an optocoupler-coupled flyback converter with tight board area constraints. IC Role / Device Role / Timing Role: Precision shunt reference and error amplifier - compares scaled output voltage against internal 1.24V reference and drives optocoupler LED current. Use Value: Enables stable 3.3V regulation with <11mV reference drift over temperature and no external compensation components. |
Use Scenario: Replacing discrete 2.5V or 3.3V Zener diodes in low-current bias networks for op-amps and ADC references. IC Role / Device Role / Timing Role: Adjustable shunt regulator - sets precise voltage via resistor divider while sinking only 55–100µA minimum current. Use Value: Delivers 0.5% initial accuracy and 0.25Ω impedance versus ±5% Zener tolerance and >10Ω dynamic resistance. |
| Programmable Undervoltage Lockout (UVLO) | Comparator with Integrated Reference |
|
Use Scenario: Detecting battery voltage drop below 2.7V in portable medical devices before shutdown. IC Role / Device Role / Timing Role: Open-loop comparator - REF pin biased by resistive divider; CATHODE pulled high when threshold crossed. Use Value: Eliminates need for external reference IC and comparator, reducing component count and board space by 2–3 parts. |
Use Scenario: Monitoring microcontroller supply rail for brown-out detection in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Self-contained comparator - uses internal 1.24V reference and provides rail-to-rail output swing with <1µA input bias. Use Value: Achieves sub-10mV trip-point hysteresis with resistor tuning and avoids external reference drift errors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV431AILPR | 1% VREF tolerance at 25°C; otherwise identical electrical specs and SC-70 packaging | Suitable for cost-sensitive industrial power supplies where ±1% regulation is acceptable | Select TLV431AILPR when tighter 0.5% tolerance is unnecessary and BOM cost reduction is prioritized |
| TLVH431ILP | Wider VKA range (1.24V–18V); higher IK rating (80mA); offered in SOT-89, not SC-70 | Required for >6V output regulation or higher-current shunt applications (e.g., 12V DC-DC post-regulation) | Choose TLVH431ILP only when cathode voltage exceeds 6V or cathode current exceeds 15mA - not a drop-in replacement |
Compared with TLV431AILPR, TLV431BILPR offers tighter reference accuracy for precision feedback loops; compared with TLVH431ILP, it trades higher voltage/current capability for ultra-compact SC-70 size and lower quiescent current - making TLV431BILPR optimal for miniaturized 3.3V/5V isolated converters.
Availability
TLV431BILPR is available at Aetrix Electronics and suitable for isolated flyback SMPSs, programmable UVLO circuits, and Zener-replacement voltage referencing requiring stable component supply, consistent parametric performance, and long-term lifecycle support.
Supply support for TLV431BILPR 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 delivering analog and embedded processing solutions, with over 90 years of innovation in precision analog ICs and power management.
The TLV431 family was designed specifically for low-voltage, high-accuracy shunt regulation in space-constrained power systems - targeting 3V–3.3V isolated SMPS feedback, battery monitoring, and reference replacement applications.
FAQ
What is the operating temperature range for TLV431BILPR?
The TLV431BILPR is qualified for operation from –40°C to +125°C (Q-grade), with guaranteed VREF deviation of 11mV and Iref deviation of 0.15µA maximum across this full range. This makes TLV431BILPR suitable for under-hood automotive modules and industrial control units exposed to extreme thermal cycling.
Can TLV431BILPR replace TL431 in existing designs?
TLV431BILPR can replace TL431 only if the design accommodates its lower 1.24V reference voltage, reduced minimum cathode current (55µA vs 1mA), and SC-70 pinout. Direct substitution requires verifying that the feedback network scales correctly for 1.24V and that layout supports the DCK package - TLV431BILPR is not pin-compatible with TL431's TO-92 or SOIC footprints.
Does TLV431BILPR require an output capacitor for stability?
No, TLV431BILPR is internally compensated and remains stable without an output capacitor between CATHODE and ANODE - a key advantage over many shunt regulators. However, if an output capacitor is used for noise filtering, Figure 5-19 in the TI datasheet provides phase-margin guidance for selecting values that maintain stability across load and temperature.
What is the function of Pin 2 (Substrate) on TLV431BILPR?
Pin 2 on TLV431BILPR is the substrate connection and must be connected to the ANODE terminal or left electrically floating - it must never be tied directly to PCB ground or any other potential. Improper handling of Pin 2 may cause parameter shift or functional failure, as confirmed in TI's Package Information section and Pin Functions table.
How does TLV431BILPR behave in open-loop comparator mode?
In open-loop mode, TLV431BILPR functions as a comparator with integrated 1.24V reference: when voltage at the REF pin exceeds VREF, the CATHODE sinks current; below VREF, it remains high-impedance. Its gain and response time depend on cathode current - ≥100µA ensures fast switching, making TLV431BILPR effective for UVLO and fault detection without external components.
TLV431BILPR 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):
- 1.24V
- Voltage - Output (Max):
- 6 V
- Current - Output:
- 15 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 100 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
TLV431BILPR FAQ
1.How can I place an order for TLV431BILPR through Aetrix?
Please submit a Request for Quotation (RFQ) for TLV431BILPR 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 TLV431BILPR reliable?
The price and inventory of TLV431BILPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLV431BILPR is usually 5 days.
3.What payment methods are accepted for TLV431BILPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLV431BILPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLV431BILPR?
TLV431BILPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLV431BILPR 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 TLV431BILPR?
For technical support, including TLV431BILPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLV431BILPR requirements.
6.How does Aetrix verify that TLV431BILPR is sourced from the original manufacturer or authorized distributors?
All TLV431BILPR 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 TLV431BILPR meets industry standards.
7.What is the process for return or replacement of TLV431BILPR?
All TLV431BILPR units undergo pre-shipment inspection (PSI). If there is an issue with TLV431BILPR, 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 TLV431BILPR part is unused and in its original packaging.
Return procedure for TLV431BILPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLV431BILPR 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…
