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STMicroelectronics TL432IL3T
- Part No.:
- TL432IL3T
- Manufacturer:
- STMicroelectronics
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL432IL3T.pdf
- Description:
- IC VREF SHUNT ADJ 2.21% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:13,357
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Product details
Overview
TL432IL3T from STMicroelectronics is an AEC-Q100 qualified automotive-grade adjustable shunt voltage reference in SOT23-3 package, delivering 2.5–36 V programmable output with 2% initial accuracy, 100 mA sink current capability, and 0.22 Ω typical dynamic impedance for precision feedback in DC-DC converters and battery management systems.
For engineers reviewing the TL432IL3T datasheet, TL432IL3T pinout, TL432IL3T application, or TL432IL3T equivalent, key selection criteria include automotive temperature range (−40 °C to +125 °C), cathode-anode voltage stability under load variation, reference input current tolerance (≤6.5 µA), and SOT23-3 thermal resistance (136 °C/W junction-to-case).
Technical Context
The TL432IL3T operates as a 3-terminal adjustable shunt regulator where the REF pin senses voltage via external resistor divider, controlling cathode current to maintain precise VREF = 2.5 V at the reference node. Its internal transconductance amplifier drives an NPN output stage capable of sinking 1–100 mA.
It features guaranteed −40 °C to +125 °C operation with ≤30 mV reference voltage deviation over temperature, <1.4 mV/V sensitivity to cathode-anode voltage changes, and stable performance with capacitive loads up to 10 µF-enabling direct use in isolated flyback feedback loops without compensation components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 2.5 V to 36 V - set externally via two resistors; enables flexible regulation across wide supply rails. |
| Initial Accuracy | ±2% at 25 °C - ensures tight output tolerance without trimming in automotive power supplies. |
| Sink Current Range | 1 mA to 100 mA - supports high-gain optocoupler interfaces and direct error amplifier drive. |
| Dynamic Impedance | 0.22 Ω typical - minimizes output voltage perturbation during transient load steps. |
| Temp. Range | −40 °C to +125 °C - validated for under-hood automotive applications per AEC-Q100 Grade 1. |
| Ref Input Current | ≤6.5 µA max - reduces divider power loss and improves high-impedance sensing reliability. |
| Voltage Deviation | ≤30 mV over full temp. range - maintains regulation stability in engine control units and ADAS modules. |
Pinout & Package
TL432IL3T uses the SOT23-3 plastic surface-mount package (JEDEC TO-236AB), measuring 2.90 mm × 1.30 mm × 1.02 mm with 136 °C/W junction-to-case thermal resistance. The device has three terminals: Cathode (K), Anode (A), and Reference (REF), with no NC pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (K) | Current sink output terminal | Connects to primary-side feedback node in isolated converters; carries full regulated load current. |
| Anode (A) | Return path for cathode current | Biased to ground or low-side reference; forms current loop with cathode and external resistor network. |
| Reference (REF) | High-impedance voltage sense input | Monitors divided output voltage; triggers regulation when voltage exceeds 2.5 V threshold. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualification | Grade 1 certified for automotive use - eliminates need for additional qualification testing in Tier-1 designs. |
| Adjustable output | 2.5–36 V via external resistors - replaces multiple fixed-voltage references with single BOM item. |
| Low dynamic impedance | 0.22 Ω typical - sustains regulation accuracy during fast load transients in EPS and infotainment supplies. |
| Wide operating current | 1–100 mA sink range - accommodates both low-power sensor biasing and high-current optocoupler drive. |
| Stable with capacitive loads | Validated up to 10 µF - enables direct connection to optocoupler LED without phase-compensation networks. |
Applications
| Automotive DC-DC Converter | Industrial Power Supply |
|---|---|
|
Use Scenario: Feedback regulation in 12 V/48 V bidirectional DC-DC converter for 48 V mild hybrid systems. IC Role / Device Role / Timing Role: Shunt reference providing precise 2.5 V threshold to control PWM duty cycle via optocoupler-coupled error amplifier. Use Value: Maintains ±1.5% output regulation across −40 °C to +125 °C ambient and 100 kHz switching noise. |
Use Scenario: Secondary-side voltage regulation in industrial AC-DC power supply with remote sensing. IC Role / Device Role / Timing Role: Adjustable shunt reference setting 24 V output via R1/R2 divider; sinks 15 mA into optocoupler LED. Use Value: Enables <0.5% line/load regulation drift over 0–100% load and 100–264 VAC input range. |
| Battery Management System | Programmable Load Switch |
|
Use Scenario: Cell voltage monitoring reference in 12-cell Li-ion pack with passive balancing circuitry. IC Role / Device Role / Timing Role: Precision 2.5 V reference for comparator-based cell overvoltage detection; draws <1 µA quiescent current. Use Value: Achieves ±5 mV absolute voltage accuracy at 85 °C, enabling reliable 4.25 V/cell cutoff. |
Use Scenario: Enable-controlled voltage clamp in programmable current-limit circuit for USB-C PD sink. IC Role / Device Role / Timing Role: Adjustable shunt reference sets 5.1 V clamp threshold; sinks up to 80 mA during overvoltage events. Use Value: Limits transient overshoot to <5.25 V with <100 ns response time, protecting downstream USB controllers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431IL3T | Same SOT23-3 package and −40 °C to +125 °C rating, but lacks AEC-Q100 qualification; 2% accuracy identical. | Acceptable for industrial-grade designs where automotive qualification is not mandated. | Select TL431IL3T only if AEC-Q100 compliance is unnecessary and cost optimization is prioritized. |
| TL432ACL3T | 1% initial accuracy (vs. 2% for TL432IL3T); otherwise identical electrical specs, package, and temperature range. | Required where tighter output tolerance is needed, e.g., high-precision ADC reference buffers or metrology subsystems. | Choose TL432ACL3T when system-level accuracy demands <±10 mV reference error at 25 °C. |
Compared with TL432IL3T, TL431IL3T omits automotive qualification but matches thermal and electrical behavior, while TL432ACL3T trades higher accuracy for slightly increased cost-making TL432IL3T optimal for cost-sensitive AEC-Q100-compliant applications requiring 2% tolerance.
Availability
TL432IL3T is available at Aetrix Electronics and suitable for automotive power conversion, industrial SMPS design, and battery management systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TL432IL3T 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, power ICs, sensors, and analog components for automotive, industrial, and consumer markets.
The TL432 belongs to ST's precision analog voltage reference product line, engineered specifically for automotive-grade feedback control in safety-critical power systems where reliability across extreme temperatures is mandatory.
FAQ
What is the maximum cathode-anode voltage for TL432IL3T?
The absolute maximum cathode-to-anode voltage is 37 V. Operation above this level risks permanent damage. In normal use, the device regulates with VKA ranging from VREF (2.5 V) up to 36 V, making it suitable for 24 V and 48 V automotive rail applications.
Can TL432IL3T replace TL431 in existing designs?
Yes, TL432IL3T is functionally and pin-compatible with TL431 variants in SOT23-3 package. It shares identical pinout, electrical characteristics, and thermal profile-but adds AEC-Q100 qualification, making it drop-in suitable for upgrading legacy industrial designs to automotive standards.
How does the reference input current vary with temperature?
Reference input current remains ≤6.5 µA across −40 °C to +125 °C, with deviation limited to ≤2.5 µA over temperature. This stability ensures consistent resistor-divider loading and prevents output voltage drift due to IREF variation in high-temperature engine bay environments.
Is external compensation required when driving optocouplers?
No external compensation is required. The TL432IL3T is internally compensated for stable operation with capacitive loads up to 10 µF, including standard optocoupler LEDs. This eliminates the need for series RC networks or additional op-amps in isolated feedback paths.
TL432IL3T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 2.495V
- Voltage - Output (Max):
- 36 V
- Current - Output:
- 100 mA
- Tolerance:
- ±2.21%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 80 µA
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
TL432IL3T FAQ
1.How can I place an order for TL432IL3T through Aetrix?
Please submit a Request for Quotation (RFQ) for TL432IL3T 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 TL432IL3T reliable?
The price and inventory of TL432IL3T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL432IL3T is usually 5 days.
3.What payment methods are accepted for TL432IL3T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL432IL3T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL432IL3T?
TL432IL3T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL432IL3T 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 TL432IL3T?
For technical support, including TL432IL3T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL432IL3T requirements.
6.How does Aetrix verify that TL432IL3T is sourced from the original manufacturer or authorized distributors?
All TL432IL3T 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 TL432IL3T meets industry standards.
7.What is the process for return or replacement of TL432IL3T?
All TL432IL3T units undergo pre-shipment inspection (PSI). If there is an issue with TL432IL3T, 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 TL432IL3T part is unused and in its original packaging.
Return procedure for TL432IL3T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL432IL3T Tags
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TL431AIDBZR
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TL431BQDBZR
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AN431AN-ATRG1
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LM4040CYM3-2.5-TR
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LM4040CYM3-4.1-TR
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AZ431LBNTR-G1
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
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AZ431LANTR-G1
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