My Inquiry
My Account
Texas Instruments TLVH431AILP
,TO-226_straightlead.jpg)
- Part No.:
- TLVH431AILP
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
TLVH431AILP.pdf
- Description:
- IC VREF SHUNT ADJ 1% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,821
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
TLVH431AILP from Texas Instruments is a low-voltage adjustable precision shunt regulator in TO-92 package, providing 1.24 V reference voltage with ±1% initial tolerance at 25°C, 100 μA to 70 mA cathode current range, and operation from –40°C to +85°C. It functions as an integrated voltage reference and error amplifier in isolated flyback SMPS feedback loops, replacing Zener diodes in low-leakage on-board regulation.
For engineers reviewing the TLVH431AILP datasheet, TLVH431AILP pinout, TLVH431AILP application, or TLVH431AILP equivalent, this page delivers verified electrical parameters, TO-92 terminal mapping, thermal resistance (140°C/W), dynamic impedance (0.25 Ω), and real-world implementation guidance for secondary-side regulation and voltage monitoring circuits.
Technical Context
The TLVH431AILP operates as a 3-terminal adjustable shunt reference with internal 1.24 V bandgap reference and high-gain transconductance amplifier driving a Darlington output stage. Its open-loop comparator mode enables precise voltage monitoring without external reference, while closed-loop configuration with two resistors sets output voltage from 1.24 V to 18 V.
It achieves stable regulation with no mandatory output capacitor due to internal compensation, supports cathode voltages up to 20 V absolute maximum, and maintains 0.25 Ω typical dynamic impedance across 0.1 mA–70 mA cathode current - critical for tight-load-regulation designs in 3.3 V and lower isolated power supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage (VREF) | 1.24 V ±1% at 25°C - defines minimum setpoint for adjustable output; enables regulation down to 1.24 V in low-voltage systems. |
| Cathode Current Range | 100 μA to 70 mA - supports ultra-low-power monitoring (e.g., battery supervision) and robust shunt regulation under load transients. |
| Dynamic Impedance | 0.25 Ω typical - ensures <1 mV output deviation per 1 mA cathode current change; critical for high-accuracy feedback paths. |
| Operating Temperature | –40°C to +85°C - qualified for industrial ambient environments; VREF drift ≤20 mV over full range (TLVH431AI grade). |
| Output Voltage Range | VREF to 18 V - set via external resistor divider; enables flexible rail monitoring and programmable clamp points without discrete references. |
| Reference Input Current | 0.1–0.5 μA - ultra-low bias current minimizes divider loading error and enables high-resistance feedback networks (e.g., >1 MΩ). |
| Thermal Resistance (RθJA) | 140°C/W (TO-92) - determines max power dissipation (e.g., 350 mW at 85°C ambient); requires heatsinking above ~200 mW continuous. |
Pinout & Package
TLVH431AILP uses a 3-pin TO-92 package (4.30 mm × 4.30 mm body) with through-hole mounting. Pin 1 is CATHODE, Pin 2 is ANODE, Pin 3 is REF - matching standard TO-92 orientation (flat side facing viewer, leads down).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE (Pin 1) | Shunt current input / regulated output node | Connects to supply rail being monitored or regulated; sinks current to maintain VREF at REF pin; voltage headroom ≥1.24 V required. |
| ANODE (Pin 2) | Common return / ground reference | Typically connected to system ground or negative rail; serves as current return path and voltage reference point for VKA. |
| REF (Pin 3) | Threshold input / reference sense | Compares against internal 1.24 V reference; must be biased with ≤0.5 μA current; floating connection invalidates regulation. |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Regulates from 1.24 V - enables use in 1.8 V, 2.5 V, and 3.3 V systems where legacy TL431 (2.5 V) cannot function. |
| Ultra-low reference current | 0.1–0.5 μA - permits high-impedance resistor dividers (>1 MΩ), reducing power loss and PCB space in battery-powered applications. |
| Stable without output capacitor | Internally compensated - eliminates need for stability capacitor in most configurations, simplifying layout and reducing BOM count. |
| Sharp turn-on characteristic | High open-loop gain (>60 dB) - provides fast response in comparator mode for overvoltage/undervoltage detection with clean logic transitions. |
| Zener replacement capability | 100 nA off-state cathode current - 10× lower leakage than typical 1.2 V Zeners, improving accuracy in high-impedance sensing nodes. |
Applications
| Secondary-Side Regulation | Voltage Monitoring |
|---|---|
|
Use Scenario: Isolated 3.3 V flyback converter with optocoupler feedback loop. IC Role / Device Role / Timing Role: Adjustable shunt reference and error amplifier on secondary side, comparing output voltage against 1.24 V reference. Use Value: Enables precise output regulation (±1%) at 3.3 V with minimal component count; supports startup down to 2.7 V due to low VREF. |
Use Scenario: Real-time monitoring of 5 V and 12 V power rails in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Comparator with integrated reference detecting undervoltage lockout (UVLO) thresholds. Use Value: Eliminates external reference IC; 0.5 μA reference current allows direct connection to rail via single high-value resistor for low-power supervision. |
| Zener Diode Replacement | Adjustable Data Converter Reference |
|
Use Scenario: On-board 2.5 V LDO output stabilization in space-constrained IoT sensor node. IC Role / Device Role / Timing Role: Precision shunt regulator clamping output voltage using external resistor network. Use Value: Replaces 2.5 V Zener with 1% tolerance and 0.25 Ω dynamic impedance - reduces output ripple by >5× versus 5% Zener parts. |
Use Scenario: Setting reference voltage for 12-bit SAR ADC in medical ECG front-end. IC Role / Device Role / Timing Role: Programmable analog reference source with temperature-stable 1.24 V core. Use Value: Delivers 12 ppm/°C effective tempco via resistor ratio; enables <0.5 LSB INL error over 0°C–70°C without calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431ACLP | Same TO-92 package and 1.24 V reference, but 0.5% initial tolerance (B-grade) and 0°C–70°C temp range. | Better accuracy for lab equipment or test fixtures; unsuitable for extended industrial temperature operation. | Select when ±0.5% VREF tolerance is required and ambient stays within commercial range. |
| TLVH432AILP | Identical electrical specs, but alternate pinout: Pin 1 = REF, Pin 2 = ANODE, Pin 3 = CATHODE (vs. TLVH431AILP's Pin 1 = CATHODE). | Requires PCB layout revision; used where REF pin routing benefits from different terminal sequence. | Choose only if existing board design matches TLVH432 pin assignment; not drop-in compatible. |
Compared with TLVH431AILP, TLVH431ACLP offers tighter 0.5% reference tolerance at the cost of reduced temperature range, while TLVH432AILP provides identical performance with reversed pinout - requiring layout changes but enabling optimized REF trace routing in dense layouts.
Availability
TLVH431AILP is available at Aetrix Electronics and suitable for industrial power supplies, embedded voltage supervision, and precision analog reference circuits requiring stable component supply and long-term lifecycle support.
Supply support for TLVH431AILP 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 expertise in precision reference and power control ICs.
The TLVH431 family was designed for low-voltage, high-accuracy shunt regulation in isolated power supplies and voltage monitoring systems - extending TL431 functionality to 1.24 V operation while maintaining industrial temperature capability and Zener-replacement utility.
FAQ
What is the reference voltage tolerance of TLVH431AILP at 25°C?
The TLVH431AILP has a reference voltage tolerance of ±1% at 25°C, corresponding to a 1.24 V nominal VREF with a range of 1.228 V to 1.252 V. This A-grade specification is confirmed in Section 5.6 of the TI SLVS555N datasheet and applies across all operating conditions at room temperature.
Can TLVH431AILP operate with cathode current below 100 μA?
No - TLVH431AILP requires a minimum cathode current of 100 μA to maintain regulation, as specified in the "IK(min)" parameter (Section 5.5). Operation below this threshold results in insufficient gain and unstable reference behavior; the device may not regulate accurately or may enter high-impedance state.
What is the maximum cathode voltage for TLVH431AILP?
The absolute maximum cathode voltage for TLVH431AILP is 20 V, measured relative to the ANODE pin (Section 5.1 Absolute Maximum Ratings). Continuous operation above 18 V violates recommended conditions and risks permanent damage or parametric shift.
Does TLVH431AILP require an output capacitor for stability?
No - TLVH431AILP is internally compensated and stable without an output capacitor between CATHODE and ANODE. However, if a capacitor is added for noise filtering, Figures 5-15 to 5-17 in the datasheet provide phase-margin guidance for selecting values that avoid oscillation under varying capacitive loads.
How does the TO-92 package of TLVH431AILP affect thermal performance?
The TLVH431AILP in TO-92 package has a junction-to-ambient thermal resistance (RθJA) of 140°C/W. At 85°C ambient, this limits continuous power dissipation to approximately 350 mW before exceeding the 150°C max junction temperature - requiring careful thermal design in high-current or enclosed environments.
TLVH431AILP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 1.24V
- Voltage - Output (Max):
- 18 V
- Current - Output:
- 70 mA
- Tolerance:
- ±1%
- 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
TLVH431AILP FAQ
1.How can I place an order for TLVH431AILP through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH431AILP 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 TLVH431AILP reliable?
The price and inventory of TLVH431AILP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431AILP is usually 5 days.
3.What payment methods are accepted for TLVH431AILP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH431AILP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLVH431AILP?
TLVH431AILP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH431AILP 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 TLVH431AILP?
For technical support, including TLVH431AILP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431AILP requirements.
6.How does Aetrix verify that TLVH431AILP is sourced from the original manufacturer or authorized distributors?
All TLVH431AILP 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 TLVH431AILP meets industry standards.
7.What is the process for return or replacement of TLVH431AILP?
All TLVH431AILP units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431AILP, 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 TLVH431AILP part is unused and in its original packaging.
Return procedure for TLVH431AILP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH431AILP 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…
