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Texas Instruments TL432IPK
- Part No.:
- TL432IPK
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-243AA
- Datasheet:
-
TL432IPK.pdf
- Description:
- IC VREF SHUNT ADJ 2.2% SOT89-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,596
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Product details
Overview
TL432IPK from Texas Instruments is a precision programmable shunt voltage reference in SOT-89 package, featuring 0.5% initial reference voltage tolerance (B-grade), 2.495 V nominal VREF, and operation across −40°C to 125°C. It delivers 1 mA to 100 mA sink current with 0.2 Ω typical dynamic impedance and supports adjustable output from 2.5 V to 36 V using two external resistors - widely deployed in industrial AC/DC power supplies and servo drive control modules.
For engineers reviewing the TL432IPK datasheet, TL432IPK pinout, TL432IPK application, or TL432IPK equivalent, key selection considerations include its Q-temp grade temperature range, SOT-89 thermal performance (RθJA = 52°C/W), cathode-to-anode voltage capability up to 36 V, and distinct PK-package pin configuration versus TL431 variants.
Technical Context
The TL432IPK implements a three-terminal adjustable shunt regulator architecture with an internal precision bandgap reference and high-gain error amplifier. Its sharp turn-on characteristic and low 0.2 Ω dynamic impedance enable stable regulation in feedback loops of switching power supplies and isolated DC-DC converters.
Unlike the TL431, the TL432IPK uses a different pinout: Pin 1 = REF, Pin 2 = ANODE, Pin 3 = CATHODE - requiring PCB layout revision when substituting for TL431-based designs. It shares identical electrical specifications with TL431BQ but is not pin-compatible.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF Tolerance | ±0.5% at 25°C (B-grade) - enables tight output voltage regulation without trimming in mid-power supplies. |
| VREF Nominal | 2.495 V - sets minimum adjustable output; combined with external resistors, supports 2.5 V–36 V output range. |
| Temp Range | −40°C to +125°C (Q-grade) - qualified for under-hood automotive and industrial motor drive environments. |
| Dynamic Impedance | 0.2 Ω typical - ensures minimal output voltage shift under load transients in closed-loop feedback paths. |
| Sink Current | 1 mA to 100 mA - provides sufficient drive for optocoupler LEDs in isolated flyback controllers. |
| Output Noise | Low broadband noise - critical for high-accuracy voltage monitoring in servo position feedback circuits. |
| Thermal Resistance | RθJA = 52°C/W (SOT-89) - allows >1 W dissipation at 25°C ambient before reaching 150°C junction limit. |
Pinout & Package
SOT-89 (PK) package: 3-pin surface-mount, 4.5 mm × 2.5 mm × 1.6 mm body, exposed thermal pad (connected to ANODE), rated for 1.5 W power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (REF) | Reference input | High-impedance threshold node; connects to voltage divider midpoint to set regulated output voltage. |
| Pin 2 (ANODE) | Common return | Internally tied to substrate; must be connected to system ground or low-side return path. |
| Pin 3 (CATHODE) | Shunt current output | Drives external load or optocoupler LED; voltage at this pin equals regulated output in shunt configuration. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable shunt regulation | Enables precise 2.5 V–36 V output setting with only two external resistors - eliminates need for multiple fixed-voltage references. |
| 0.5% initial accuracy (B-grade) | Reduces post-production calibration effort in industrial power modules where ±1% output tolerance is required. |
| Q-temp grade qualification | Validated for −40°C to +125°C operation - suitable for servo drives, inverters, and other high-temperature industrial controls. |
| 0.2 Ω dynamic impedance | Maintains regulation stability during fast load steps in switched-mode power supply feedback networks. |
| SOT-89 thermal performance | RθJA = 52°C/W enables higher continuous power handling than SOT-23 variants - ideal for 5–20 W power rails. |
Applications
| Industrial AC/DC Power Supply | Servo Drive Control Module |
|---|---|
Use Scenario: Primary-side voltage sensing and feedback in 10–50 W offline flyback converters. IC Role / Device Role / Timing Role: Shunt reference providing precise error signal to optocoupler-driven PWM controller. Use Value: Enables ±1% output regulation over line/load/temperature with no secondary-side sensing components. |
Use Scenario: Voltage reference for analog current loop scaling and DAC output buffering in motor control boards. IC Role / Device Role / Timing Role: Stable 2.5 V reference source for ADC biasing and analog comparator thresholds. Use Value: Maintains <±2 mV drift over −40°C to +125°C, ensuring consistent torque command resolution across operating range. |
| Rack Server Power | AC Inverter & VF Drives |
Use Scenario: Secondary-side output voltage regulation in redundant 12 V/48 V intermediate bus converters. IC Role / Device Role / Timing Role: Precision shunt reference in isolated feedback path with digital PMBus interface. Use Value: Supports remote voltage margining via resistor network adjustment without firmware changes. |
Use Scenario: Reference for gate driver biasing and overvoltage protection comparators in 3-phase IGBT gate driver stages. IC Role / Device Role / Timing Role: Stable voltage threshold generator for DC-link overvoltage detection circuitry. Use Value: Guarantees trip point accuracy within ±10 mV across full temperature range, preventing false shutdowns. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431BQPK | Same Q-temp grade and SOT-89 package, but TL431 pinout (REF on Pin 2, CATHODE on Pin 1). | Requires PCB layout change due to reversed REF/CATHODE pins; otherwise identical regulation performance. | Select TL431BQPK only if reusing existing TL431-based board layouts with Pin 1 = CATHODE convention. |
| TLVH431BQDBVR | Lower 1.24 V reference, 0.5% tolerance, SOT-23-5 package, max 30 V cathode voltage. | Not suitable for >30 V systems; better for low-voltage logic-supply monitoring and battery management. | Choose TLVH431BQDBVR when designing compact, low-power systems needing sub-2.5 V reference points. |
Compared with TL432IPK, TL431BQPK demands pinout-aware layout revision but offers identical thermal and regulation specs, while TLVH431BQDBVR trades voltage range and package size for lower reference voltage and reduced footprint - making TL432IPK optimal for high-voltage industrial shunt regulation where SOT-89 thermal robustness is essential.
Availability
TL432IPK is available at Aetrix Electronics and suitable for industrial AC/DC power supplies, servo drive control modules, and rack server power systems requiring stable component supply with guaranteed long-term availability.
Supply support for TL432IPK 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 and embedded processing technologies, with decades of expertise in precision reference and power management ICs.
The TL43x family was designed specifically for high-stability shunt regulation in industrial, automotive, and telecom power systems - emphasizing accuracy, thermal robustness, and ease of implementation in isolated feedback architectures.
FAQ
What is the reference voltage tolerance of TL432IPK at 25°C?
The TL432IPK has a ±0.5% initial reference voltage tolerance at 25°C, corresponding to the B-grade specification. This means its nominal 2.495 V reference falls between 2.483 V and 2.507 V under standard test conditions (VKA = VREF, IKA = 10 mA). This tight tolerance reduces calibration overhead in precision power supply designs.
How does TL432IPK differ from TL431IPK in pin configuration?
The TL432IPK uses a distinct pinout in the SOT-89 (PK) package: Pin 1 = REF, Pin 2 = ANODE, Pin 3 = CATHODE. In contrast, TL431IPK places REF on Pin 2 and CATHODE on Pin 1. This reversal means TL432IPK is not a drop-in replacement - PCB layout and schematic connections must be updated to avoid functional failure.
What is the maximum cathode-to-anode voltage rating for TL432IPK?
The absolute maximum cathode-to-anode voltage (VKA) for TL432IPK is 37 V, with recommended operation up to 36 V. Exceeding this risks permanent damage. This rating supports use in 24 V and 36 V industrial bus systems, including AC inverter DC-link monitoring and high-voltage servo supply regulation.
Can TL432IPK operate in automotive under-hood environments?
Yes - TL432IPK is a Q-grade device qualified for operation from −40°C to +125°C, meeting extended temperature requirements for under-hood automotive applications such as engine control power supplies and electric power steering auxiliary regulators. Its thermal resistance (RθJA = 52°C/W) supports reliable operation at elevated ambient temperatures.
What is the minimum cathode current required for regulation in TL432IPK?
The TL432IPK requires a minimum cathode current (Imin) of 0.4 mA to maintain regulation, with typical values up to 0.7 mA depending on temperature and grade. This low startup current enables stable operation even with high-value feedback resistors, reducing quiescent power in always-on industrial control circuits.
TL432IPK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-243AA
- 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:
- ±2.2%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 80 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-89-3
TL432IPK FAQ
1.How can I place an order for TL432IPK through Aetrix?
Please submit a Request for Quotation (RFQ) for TL432IPK 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 TL432IPK reliable?
The price and inventory of TL432IPK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL432IPK is usually 5 days.
3.What payment methods are accepted for TL432IPK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL432IPK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL432IPK?
TL432IPK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL432IPK 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 TL432IPK?
For technical support, including TL432IPK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL432IPK requirements.
6.How does Aetrix verify that TL432IPK is sourced from the original manufacturer or authorized distributors?
All TL432IPK 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 TL432IPK meets industry standards.
7.What is the process for return or replacement of TL432IPK?
All TL432IPK units undergo pre-shipment inspection (PSI). If there is an issue with TL432IPK, 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 TL432IPK part is unused and in its original packaging.
Return procedure for TL432IPK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL432IPK Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
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AN431AN-ATRG1
Diodes Incorporated
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LM4040CYM3-2.5-TR
Microchip Technology
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LM4040CYM3-4.1-TR
Microchip Technology
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LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
Texas Instruments
-
LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
-
LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
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