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STMicroelectronics TLVH431LICT
- Part No.:
- TLVH431LICT
- Manufacturer:
- STMicroelectronics
- Category:
- Voltage Reference
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
TLVH431LICT.pdf
- Description:
- IC VREF SHUNT ADJ 1.5% SOT323-6L
- Quantity:
- Payment:
- Shipping:
Inventory:5,965
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Product details
Overview
TLVH431LICT from STMicroelectronics is a 1.5% precision adjustable shunt voltage reference with 1.24 V to 18 V output range, 100 µA minimum operating current, and ±30 ppm/°C max temperature coefficient, housed in SOT323-6L package for space-constrained power regulation in battery chargers and SMPS feedback loops.
For engineers reviewing the TLVH431LICT datasheet, TLVH431LICT pinout, TLVH431LICT application, or TLVH431LICT equivalent, this page delivers verified electrical specs, thermal performance, package dimensions, real-world use cases, and validated alternative parts - all aligned with ST's production data (DocID023303 Rev 8, Sep 2020).
Technical Context
The TLVH431LICT operates as a two-terminal programmable shunt regulator, using an external resistor divider to set output voltage between 1.24 V and 18 V. Its internal bandgap reference and error amplifier deliver stable regulation across -40°C to +125°C with ≤0.22 Ω dynamic impedance at 10–60 mA cathode current.
It supports wide-swing cathode-to-anode voltage (VKA = Vref to 18 V), maintains <2.5 µA reference input current, and exhibits <80 nA off-state cathode leakage at 125°C - enabling low-power, high-accuracy feedback in isolated DC-DC converters and portable energy management systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 1.24 V to 18 V - externally set via resistor divider; enables flexible feedback design without fixed-voltage constraints. |
| Voltage Precision | ±1.5% at 25°C - guarantees initial accuracy for cost-sensitive regulation where tighter tolerance is not required. |
| Tempco (Max) | ±30 ppm/°C - ensures ≤±26.7 mV total drift over -40°C to +125°C, critical for industrial-grade thermal stability. |
| Min Operating Current | 100 µA - allows operation in ultra-low-power modes, e.g., battery backup circuits or always-on monitoring rails. |
| Sink Current Capability | 60 mA - supports direct drive of optocoupler LEDs or small load transistors in isolated feedback paths. |
| Dynamic Impedance | 0.22 Ω typical - minimizes output voltage perturbation under fast load transients in switching regulator loops. |
| Turn-on Time | 40–70 µs - enables rapid response to startup or fault recovery events in regulated power supplies. |
Pinout & Package
SOT323-6L is a 6-pin surface-mount package measuring 2.2 mm × 1.35 mm × 1.1 mm (max), optimized for high-density PCB layouts. Pin 1 is marked with a dot; pins are arranged in dual-row configuration with 0.65 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Reference ground node | Connects to system GND or feedback node; sets reference potential for internal error amplifier. |
| Cathode (Pin 2) | Regulated output terminal | Sinks current to maintain programmed voltage; interfaces directly with optocoupler anode or error amplifier input. |
| Ref (Pin 3) | Adjust input | High-impedance reference input (2.5 µA typ); connects to resistor divider midpoint for voltage programming. |
| No Connect (Pin 4) | Unused terminal | Internally unconnected; must be left floating or tied to GND per layout best practice to avoid noise coupling. |
| No Connect (Pin 5) | Unused terminal | Internally unconnected; no electrical function; recommended to leave unconnected or tie to GND for mechanical stability. |
| No Connect (Pin 6) | Unused terminal | Internally unconnected; serves only as mechanical support; no signal or power role in circuit operation. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable reference voltage | 1.24–18 V range via two-resistor divider - eliminates need for multiple fixed-voltage references in multi-rail designs. |
| Low quiescent current | 100 µA min operating current - extends battery life in portable chargers and enables operation from weak auxiliary windings. |
| High sink capability | 60 mA cathode current - drives standard optocouplers (e.g., PC817) without external transistor buffering. |
| Industrial temperature range | -40°C to +125°C operation - supports deployment in automotive cabin modules and industrial SMPS without derating. |
| Low dynamic impedance | 0.22 Ω typical - improves loop stability and reduces output ripple in closed-loop feedback networks. |
Applications
| Battery Charger Feedback | Isolated SMPS Regulation |
|---|---|
|
Use Scenario: Constant-voltage stage in Li-ion wall adapters with optocoupler-based secondary-side regulation. IC Role / Device Role / Timing Role: Shunt reference providing precise 4.2 V feedback to optocoupler LED, enabling accurate cell voltage control. Use Value: ±1.5% initial accuracy and ±30 ppm/°C tempco ensure ≤±45 mV total error over full temperature range, meeting USB PD charging compliance. |
Use Scenario: Secondary-side voltage sensing in flyback converters powering IoT gateways with 12 V/5 V dual outputs. IC Role / Device Role / Timing Role: Programmable reference setting 5.0 V output via R1/R2 divider; cathode sinks optocoupler current to adjust primary-side PWM duty cycle. Use Value: 60 mA sink current drives PC817 directly; 0.22 Ω dynamic impedance suppresses transient-induced output overshoot during load steps. |
| Data Acquisition Reference | Energy Management Monitor |
|
Use Scenario: Precision ADC reference in portable multimeters requiring stable 2.5 V reference derived from 3.3 V rail. IC Role / Device Role / Timing Role: Adjustable shunt reference configured for 2.5 V output; supplies low-noise, low-drift bias to SAR ADC reference input. Use Value: 30 mVRMS wideband noise and <100 nA off-state leakage preserve ENOB in 16-bit measurements under battery-powered conditions. |
Use Scenario: Voltage supervision in smart meter power supply monitoring circuits detecting brown-out on 3.3 V MCU rail. IC Role / Device Role / Timing Role: Configured as 3.0 V threshold detector; triggers reset when input drops below 3.0 V via comparator interface. Use Value: 100 µA min operating current enables reliable detection down to 2.8 V input while consuming <0.3 µW standby power. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431BICT | 0.25% initial precision (vs. 1.5%), same SOT323-6L package and 30 ppm/°C tempco | Required where tighter initial accuracy is needed for calibration-critical instrumentation or medical devices | Select when system-level calibration budget demands <±30 mV total error at 25°C; higher cost justified by test time reduction. |
| TL431CDBZR | 2% initial precision, SO-8 package, 50 ppm/°C tempco, 1 mA min cathode current | Suitable for non-critical consumer power supplies where board space and cost outweigh precision needs | Choose for legacy designs or cost-driven applications where 2.5 mm × 3 mm SO-8 footprint is acceptable and thermal performance is less constrained. |
Compared with TLVH431LICT, TLVH431BICT offers 6× tighter initial accuracy at identical thermal performance and package size, while TL431CDBZR trades precision and thermal stability for lower unit cost and broader vendor availability in SO-8 format.
Availability
TLVH431LICT is available at Aetrix Electronics and suitable for battery chargers, isolated switch-mode power supplies, and energy management monitors requiring stable component supply with guaranteed long-term manufacturability.
Supply support for TLVH431LICT 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, analog ICs, power devices, and MEMS sensors for industrial, automotive, and consumer markets.
The TLVH431 belongs to ST's precision voltage reference product line, engineered specifically for high-accuracy, low-power shunt regulation in space-constrained power management systems across industrial and portable applications.
FAQ
What is the maximum cathode-to-anode voltage for TLVH431LICT?
The absolute maximum cathode-to-anode voltage (VKA) is 22 V, but the functional operating range is Vref to 18 V per datasheet Table 4. Exceeding 18 V risks regulation loss and increased dynamic impedance; sustained operation above 22 V may cause permanent damage.
Can TLVH431LICT replace TL431 in existing designs?
Yes, with layout and resistor recalibration: TLVH431LICT shares identical pinout (Anode/Cathode/Ref) and functional behavior but requires reselection of R1/R2 to match its 1.24 V reference (vs. TL431's 2.495 V). Its lower 100 µA min current also relaxes bias requirements.
Does TLVH431LICT require an output capacitor for stability?
No external capacitor is required for basic regulation stability. However, a 10 nF capacitor across cathode-anode improves turn-on time (reducing from 70 µs to ~40 µs) and suppresses high-frequency noise in sensitive feedback paths, as shown in Figure 13 of the datasheet.
How does the 1.5% precision affect system-level accuracy in a 5 V SMPS design?
In a 5 V output design using a 1.24 V reference, the 1.5% tolerance contributes ±75 mV to total output error before considering resistor tolerance and temperature drift. Combined with 1% resistors and 30 ppm/°C tempco, total error remains within ±150 mV over -40°C to +125°C - compliant with most industrial SMPS specifications.
TLVH431LICT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 6-TSSOP, SC-88, SOT-363
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 1.24V
- Voltage - Output (Max):
- 18 V
- Current - Output:
- 60 mA
- Tolerance:
- ±1.5%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 30mVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 200 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323-6L
TLVH431LICT FAQ
1.How can I place an order for TLVH431LICT through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH431LICT 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 TLVH431LICT reliable?
The price and inventory of TLVH431LICT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431LICT is usually 5 days.
3.What payment methods are accepted for TLVH431LICT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH431LICT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLVH431LICT?
TLVH431LICT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH431LICT 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 TLVH431LICT?
For technical support, including TLVH431LICT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431LICT requirements.
6.How does Aetrix verify that TLVH431LICT is sourced from the original manufacturer or authorized distributors?
All TLVH431LICT 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 TLVH431LICT meets industry standards.
7.What is the process for return or replacement of TLVH431LICT?
All TLVH431LICT units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431LICT, 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 TLVH431LICT part is unused and in its original packaging.
Return procedure for TLVH431LICT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH431LICT Tags
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LM4040DIM3X-2.5/NOPB
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AZ431LANTR-G1
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