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Texas Instruments TL432CPK
- Part No.:
- TL432CPK
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-243AA
- Datasheet:
-
TL432CPK.pdf
- Description:
- IC VREF SHUNT ADJ 2.2% SOT89-3
- Quantity:
- Payment:
- Shipping:
Inventory:11,563
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Product details
Overview
TL432CPK from Texas Instruments is a precision programmable shunt voltage reference in SOT-89 package, delivering 2.495 V nominal reference voltage with ±0.5% initial tolerance (B grade), 0.2 Ω typical dynamic impedance, and sink-current capability from 1 mA to 100 mA. It operates across −40°C to 125°C (Q-grade) and replaces Zener diodes in feedback loops of isolated DC/DC converters and industrial power supplies.
For engineers reviewing the TL432CPK datasheet, TL432CPK pinout, TL432CPK application, or TL432CPK equivalent, this page provides verified electrical specs, thermal performance data, stability boundary conditions, and real-world implementation guidance for high-reliability power regulation designs.
Technical Context
The TL432CPK implements a three-terminal adjustable shunt regulator architecture with an internal error amplifier, reference cell, and output transistor. Its sharp turn-on characteristic and low 0.2 Ω dynamic impedance enable stable closed-loop control in flyback and forward converter feedback networks.
Unlike the TL431, the TL432CPK uses a distinct pinout (REF–ANODE–CATHODE) optimized for SOT-89 layout compatibility in space-constrained power modules. It shares identical electrical specifications with TL431BQ but requires PCB redesign due to non-pin-compatible terminal assignment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V ±12.5 mV (B grade, 25°C); sets precise feedback threshold in isolated power supply error amplifiers |
| Initial Tolerance | ±0.5% at 25°C; enables <1% output voltage accuracy without trimming in AC/DC adapters |
| Temp Range | −40°C to +125°C (Q-grade); supports operation in servo drives and automotive under-hood power modules |
| Dynamic Impedance | 0.2 Ω typical (≤1 kHz); ensures minimal output voltage perturbation during load transients in switching regulators |
| Sink Current Range | 1 mA to 100 mA; accommodates wide optocoupler LED drive requirements in 5–48 V output converters |
| Voltage Adjustment | 2.495 V to 36 V via two external resistors; allows flexible output programming without changing reference IC |
| Output Noise | Low broadband noise (typ. 200 nV/√Hz @ 1 kHz); critical for low-noise instrumentation power rails |
Pinout & Package
SOT-89 package (3-pin, 4.5 mm × 2.5 mm × 1.6 mm body), thermally enhanced with exposed tab connected to ANODE for improved heat dissipation in high-current applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1: REF | Reference Input | High-impedance input sensing voltage divider node; must be decoupled with ≤100 pF for stability |
| Pin 2: ANODE | Common Return | Internally tied to substrate; connects to system ground or return path; serves as thermal conduction pad |
| Pin 3: CATHODE | Shunt Output | Current-sinking output driving optocoupler LED or series pass transistor base; handles up to 100 mA |
Key Features
| Feature | Design Value |
|---|---|
| Sharp Turn-On Characteristic | Enables clean regulation onset at Vref without hysteresis-critical for accurate zero-crossing detection in PFC controllers |
| Thermal Stability | Max 34 mV total deviation over −40°C to +125°C (Q-grade); maintains <±1% output drift in industrial motor drives |
| Low Output Impedance | 0.2 Ω typical dynamic impedance minimizes loop gain variation across load and line changes in SMPS feedback paths |
| Wide Cathode Voltage Range | Supports 2.495 V to 36 V cathode-to-anode differential-enables direct use in 24 V and 48 V telecom and server PSUs |
| ESD Robustness | ±2000 V HBM rating protects against assembly-level ESD events without requiring external clamping in production environments |
Applications
| Rack Server Power | Industrial AC/DC |
|---|---|
Use Scenario: Primary-side feedback in digitally controlled 1 kW server PSU with active clamp flyback topology. IC Role / Device Role / Timing Role: Shunt reference providing precise 2.495 V threshold for optocoupler-coupled voltage loop compensation. Use Value: Enables ±0.5% output regulation across line/load/temperature while supporting fast transient response (<10 µs recovery). |
Use Scenario: Secondary-side voltage regulation in DIN-rail mounted 48 V/20 A industrial power supply. IC Role / Device Role / Timing Role: Adjustable shunt reference setting output voltage via resistor divider; interfaces with TL431-compatible error amplifier. Use Value: Delivers stable 48 V output with <0.1% long-term drift, meeting IEC 61000-4-30 immunity requirements. |
| AC Inverter Drives | Servo Drive Control Module |
Use Scenario: DC bus voltage monitoring and overvoltage protection circuit in 3-phase VFD with regenerative braking. IC Role / Device Role / Timing Role: Precision reference for comparator-based OVLO trip point; biased from auxiliary rail. Use Value: Guarantees repeatable 750 V DC bus trip at ±1.5 V tolerance across −40°C to +85°C ambient. |
Use Scenario: Isolated current sense amplifier reference in dual-axis servo drive with analog torque loop. IC Role / Device Role / Timing Role: Stable 2.495 V reference for ADC bias and op-amp offset nulling in signal conditioning chain. Use Value: Reduces current measurement error to <0.05% FS by eliminating reference drift-induced gain shift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431BQPK | Identical electrical specs and Q-temp rating, but TL431 pinout (CATHODE–REF–ANODE) | Requires PCB layout revision; not drop-in compatible due to reversed REF/CATHODE placement | Select when legacy TL431 footprint reuse is prioritized over TL432's optimized SOT-89 routing |
| MAX6008BCR+T | Fixed 2.500 V output, ±0.2% initial accuracy, 30 ppm/°C tempco, SOT-23-3 package | Lacks adjustability; unsuitable for variable-output or multi-rail systems requiring >2.5 V references | Choose for ultra-high-precision fixed-voltage needs where 0.2% tolerance outweighs programmability requirement |
Compared with TL431BQPK, TL432CPK offers identical performance with simplified SOT-89 routing but mandates new layout; versus MAX6008BCR+T, it trades absolute accuracy for full 2.495–36 V programmability and higher sink current-making it optimal for cost-sensitive, multi-output industrial power designs.
Availability
TL432CPK is available at Aetrix Electronics and suitable for rack server power, industrial AC/DC, and servo drive control module applications requiring stable component supply, extended temperature support, and long-lifecycle availability.
Supply support for TL432CPK 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 TL43x family-including TL432CPK-is designed for high-reliability voltage regulation in isolated switching power supplies, offering programmability, thermal stability, and robustness across automotive, industrial, and computing applications.
FAQ
What is the exact pinout configuration of TL432CPK?
The TL432CPK uses a SOT-89 package with Pin 1 = REF, Pin 2 = ANODE (substrate-connected), and Pin 3 = CATHODE. This differs from TL431's CATHODE–REF–ANODE order, making TL432CPK non-pin-compatible despite identical functionality. Always verify layout against TI's SLVS543S Figure 5-1 for PK package.
Does TL432CPK support operation at 125°C junction temperature?
Yes, TL432CPK is a Q-grade device rated for −40°C to +125°C operating free-air temperature. Its maximum junction temperature is 150°C, and with RθJA = 52°C/W (SOT-89), it sustains 100 mA sink current at 125°C ambient when properly heatsinked via the ANODE pad-verified per Section 6.3 Thermal Information.
How does TL432CPK differ electrically from TL431CPK?
TL432CPK and TL431CPK share identical electrical characteristics-including 2.495 V reference, ±0.5% tolerance, 0.2 Ω dynamic impedance, and −40°C to +125°C operation-but TL432CPK has reversed REF and CATHODE pins. No electrical parameter differs; only mechanical pin mapping changes.
Can TL432CPK replace a Zener diode in a linear regulator feedback network?
Yes, TL432CPK directly replaces Zener diodes in shunt regulator and feedback applications. Its 0.2 Ω dynamic impedance, sharp turn-on, and 1 mA minimum cathode current enable tighter regulation-e.g., achieving ±0.5% output accuracy in a 12 V linear post-regulator where a 1N4742A (12 V Zener) would drift ±5% over temperature.
What is the recommended minimum cathode current for stable regulation with TL432CPK?
The minimum cathode current for regulation is 0.4 mA (typical) and 0.7 mA (max) across −40°C to +125°C per Section 6.11. For reliable startup and stability in optocoupler-driven feedback loops, maintain ≥1 mA cathode current-ensuring the device remains in active regulation under all operating conditions including light loads.
TL432CPK 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-89-3
TL432CPK FAQ
1.How can I place an order for TL432CPK through Aetrix?
Please submit a Request for Quotation (RFQ) for TL432CPK 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 TL432CPK reliable?
The price and inventory of TL432CPK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL432CPK is usually 5 days.
3.What payment methods are accepted for TL432CPK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL432CPK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL432CPK?
TL432CPK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL432CPK 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 TL432CPK?
For technical support, including TL432CPK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL432CPK requirements.
6.How does Aetrix verify that TL432CPK is sourced from the original manufacturer or authorized distributors?
All TL432CPK 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 TL432CPK meets industry standards.
7.What is the process for return or replacement of TL432CPK?
All TL432CPK units undergo pre-shipment inspection (PSI). If there is an issue with TL432CPK, 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 TL432CPK part is unused and in its original packaging.
Return procedure for TL432CPK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL432CPK 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
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