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Texas Instruments TLVH431ACPKG3
- Part No.:
- TLVH431ACPKG3
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-243AA
- Datasheet:
-
TLVH431ACPKG3.pdf
- Description:
- IC VREF SHUNT PREC ADJ SOT-89-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,000
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Product details
Overview
TLVH431ACPKG3 from Texas Instruments is a low-voltage adjustable precision shunt regulator in SOT-89-3 package, featuring 1.24 V reference voltage (±1% at 25°C), 100 μA minimum cathode current for regulation, and operation from –40°C to +125°C. It serves as an error amplifier or voltage reference in isolated flyback SMPS feedback loops, replacing Zener diodes with lower leakage and sharper turn-on.
For engineers reviewing the TLVH431ACPKG3 datasheet, TLVH431ACPKG3 pinout, TLVH431ACPKG3 application, or TLVH431ACPKG3 equivalent, key selection criteria include reference tolerance grade (A = 1%), cathode voltage range (1.24 V to 18 V), dynamic impedance (0.25 Ω typical), thermal stability across industrial/automotive temperature ranges, and compatibility with optocoupler-based secondary-side regulation.
Technical Context
The TLVH431ACPKG3 implements a bandgap-referenced error amplifier with Darlington output stage, enabling precise shunt regulation via external resistor divider between cathode and reference pins. Its internal 1.24 V reference is stable over –40°C to +125°C with ≤31 mV total deviation for Q-grade variants.
It operates in two functional modes: open-loop comparator mode (reference pin compared to internal threshold) and closed-loop shunt regulator mode (feedback from cathode to reference pin). The device is internally compensated and stable without output capacitance, though phase margin vs. capacitive load is characterized up to 100 nF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V ±1% at 25°C - sets minimum adjustable output voltage and defines accuracy of regulated rail |
| Cathode Voltage Range | 1.24 V to 18 V - enables regulation of low-voltage rails (e.g., 3.3 V, 5 V) and higher intermediate supplies |
| Min Cathode Current | 100 μA - determines minimum bias current required to maintain regulation; critical for ultra-low-power designs |
| Dynamic Impedance | 0.25 Ω typical - ensures tight voltage regulation under varying load conditions; lower than standard Zeners |
| Operating Temperature | –40°C to +125°C - supports automotive under-hood and industrial control applications without derating |
| Reference Input Current | 0.1–0.5 μA - minimizes resistor-divider loading error and enables high-impedance feedback networks |
| Off-State Cathode Current | 0.02–0.1 μA - reduces standby power loss in always-on monitoring circuits |
Pinout & Package
SOT-89-3 package: 4.50 mm × 2.50 mm body, surface-mount, thermally enhanced with exposed pad (not electrically connected); pin 1 = CATHODE, pin 2 = ANODE, pin 3 = REF.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE (Pin 1) | Shunt current input / output node | Connects to regulated rail or optocoupler LED anode; sinks current to maintain reference voltage at REF pin |
| ANODE (Pin 2) | Common return / ground reference | Typically tied to system ground or power supply return; establishes reference point for cathode-to-anode voltage (VKA) |
| REF (Pin 3) | Feedback input / threshold sense | Monitors voltage divider output; device regulates when REF = 1.24 V; requires ≥0.1 μA input current |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Starts regulation at 1.24 V - enables use in 1.8 V, 2.5 V, and 3.3 V systems where TL431 (2.5 V) cannot function |
| Ultra-low reference current | 0.1–0.5 μA - permits high-value feedback resistors (>1 MΩ), reducing power loss and noise sensitivity |
| Sharp turn-on characteristic | High open-loop gain with Darlington output - delivers fast response in comparator mode for voltage monitoring |
| Thermal stability | ≤31 mV VREF deviation over –40°C to +125°C - maintains accuracy without external compensation in wide-temp environments |
| Zener replacement capability | 0.02–0.1 μA off-state current - achieves >10× lower leakage than 1N47xx series Zeners at same voltage rating |
Applications
| Isolated Flyback SMPS Feedback | Voltage Monitoring & Supervision |
|---|---|
Use Scenario: Secondary-side voltage regulation in 3.3 V isolated flyback converters using optocoupler feedback. IC Role / Device Role / Timing Role: Error amplifier and precision reference; compares sampled output voltage against 1.24 V internal reference and drives optocoupler LED. Use Value: Enables regulation down to ~2.7 V output (1.24 V + opto LED drop), supporting modern low-voltage rails with <1% initial tolerance. |
Use Scenario: Real-time monitoring of 5 V or 12 V power rails for brownout detection in industrial PLCs. IC Role / Device Role / Timing Role: Comparator with integrated reference; triggers reset or alert when rail falls below threshold set by resistor divider. Use Value: Eliminates external reference IC; 0.1 μA REF current allows high-impedance sensing, minimizing impact on monitored rail. |
| Adjustable Reference for ADC/DAC | Low-Power Shunt Regulator |
Use Scenario: Providing programmable reference voltage to 12-bit SAR ADCs in battery-powered data loggers. IC Role / Device Role / Timing Role: Adjustable shunt reference; sets full-scale input range via R1/R2 divider; operates continuously at <100 μA total current. Use Value: 1.24 V base reference with ±1% tolerance ensures <0.5 LSB error contribution; low IK(min) extends battery life. |
Use Scenario: On-board 3.3 V regulation for microcontroller I/O banks in space-constrained IoT edge nodes. IC Role / Device Role / Timing Role: Precision shunt regulator; clamps voltage using external pass transistor or directly sinks excess current. Use Value: 0.25 Ω dynamic impedance maintains <10 mV droop under 10 mA load transients; SOT-89 package supports 52 °C/W junction-to-ambient thermal resistance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431BPK | 0.5% reference tolerance (vs. 1% for TLVH431ACPKG3); identical SOT-89-3 package and electrical specs otherwise | Required where tighter initial accuracy is needed for high-resolution measurement systems | Select TLVH431BPK when ±0.5% VREF tolerance is mandatory; no PCB or schematic changes needed |
| TLVH432ACPK | Same electrical specs but reversed pinout: Pin 1 = REF, Pin 2 = ANODE, Pin 3 = CATHODE (vs. TLVH431ACPKG3: Pin 1 = CATHODE, Pin 2 = ANODE, Pin 3 = REF) | Used when layout constraints favor alternate pin arrangement; requires board-level pin mapping change | Choose TLVH432ACPK only if existing layout accommodates reversed pinout; not drop-in compatible |
Compared with TLVH431ACPKG3, TLVH431BPK offers higher initial accuracy without trade-offs in thermal performance or quiescent current, while TLVH432ACPK provides identical regulation capability but mandates PCB redesign due to inverted pin assignment - making TLVH431ACPKG3 optimal for new designs prioritizing accuracy-grade flexibility and layout compatibility.
Availability
TLVH431ACPKG3 is available at Aetrix Electronics and suitable for isolated power supplies, voltage supervision circuits, precision ADC references, and low-power shunt regulation requiring stable component supply across automotive, industrial, and telecom applications.
Supply support for TLVH431ACPKG3 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, embedded processing, and connectivity solutions with emphasis on reliability, longevity, and automotive-grade qualification.
The TLVH431 family was designed specifically for precision shunt regulation in space- and power-constrained systems, targeting secondary-side feedback in isolated DC/DC converters and high-accuracy voltage monitoring where traditional Zeners fall short.
FAQ
What is the reference voltage tolerance of TLVH431ACPKG3 at 25°C?
The TLVH431ACPKG3 has a reference voltage tolerance of ±1% at 25°C, corresponding to a 1.24 V nominal value ranging from 1.228 V to 1.252 V. This A-grade tolerance is confirmed in Section 5.6 of the TI SLVS555N datasheet and applies across all operating conditions unless otherwise specified. The TLVH431ACPKG3 maintains this accuracy over its full temperature range with ≤20 mV total deviation for the I-grade variant.
Can TLVH431ACPKG3 operate with cathode voltages below 2.5 V?
Yes, TLVH431ACPKG3 is explicitly designed for low-voltage operation down to 1.24 V cathode-to-anode voltage (VKA), unlike the TL431 which requires ≥2.5 V. Its bandgap reference and optimized process enable stable regulation starting at VKA = VREF, making it suitable for 1.8 V, 2.5 V, and 3.3 V systems. The datasheet confirms operation from 1.24 V to 18 V in Section 5.3 Recommended Operating Conditions.
What is the minimum cathode current required for regulation in TLVH431ACPKG3?
The TLVH431ACPKG3 requires a minimum cathode current (IK(min)) of 100 μA to maintain regulation, as specified in Sections 5.5–5.7 of the datasheet. This value is guaranteed over the full temperature range (–40°C to +125°C) and is critical for ensuring sufficient gain in the internal error amplifier. Operation below 100 μA may result in degraded regulation accuracy or loss of control loop stability.
How does TLVH431ACPKG3 differ from TLVH432ACPK in pin configuration?
TLVH431ACPKG3 uses SOT-89 pinout: Pin 1 = CATHODE, Pin 2 = ANODE, Pin 3 = REF. TLVH432ACPK reverses this: Pin 1 = REF, Pin 2 = ANODE, Pin 3 = CATHODE. This difference is documented in Figures 4-6 and 4-7 of the SLVS555N datasheet. TLVH432ACPK is electrically identical but not pin-compatible - using it in place of TLVH431ACPKG3 requires PCB layout revision.
Is TLVH431ACPKG3 suitable for automotive applications requiring AEC-Q200 compliance?
TLVH431ACPKG3 is qualified for operation from –40°C to +125°C (Q-grade temperature range) and meets TI's automotive reliability standards, though it is not formally AEC-Q200 certified as a discrete passive. Its thermal stability, low drift, and robust ESD ratings (±2000 V HBM) make it widely deployed in automotive power modules and body control units where AEC-Q100-compliant controllers manage system-level qualification.
TLVH431ACPKG3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-243AA
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- 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:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-89-3
TLVH431ACPKG3 FAQ
1.How can I place an order for TLVH431ACPKG3 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH431ACPKG3 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 TLVH431ACPKG3 reliable?
The price and inventory of TLVH431ACPKG3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431ACPKG3 is usually 5 days.
3.What payment methods are accepted for TLVH431ACPKG3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH431ACPKG3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLVH431ACPKG3?
TLVH431ACPKG3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH431ACPKG3 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 TLVH431ACPKG3?
For technical support, including TLVH431ACPKG3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431ACPKG3 requirements.
6.How does Aetrix verify that TLVH431ACPKG3 is sourced from the original manufacturer or authorized distributors?
All TLVH431ACPKG3 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 TLVH431ACPKG3 meets industry standards.
7.What is the process for return or replacement of TLVH431ACPKG3?
All TLVH431ACPKG3 units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431ACPKG3, 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 TLVH431ACPKG3 part is unused and in its original packaging.
Return procedure for TLVH431ACPKG3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH431ACPKG3 Tags
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LM4040DIM3X-2.5/NOPB
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