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Texas Instruments TL432BCPK
- Part No.:
- TL432BCPK
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-243AA
- Datasheet:
-
TL432BCPK.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT89-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,998
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Product details
Overview
TL432BCPK from Texas Instruments is a precision programmable shunt voltage reference in SOT-89 package, featuring 0.5% initial reference voltage tolerance at 25°C (B grade), adjustable output from 2.483 V to 36 V, and operation across −40°C to 125°C (Q temperature grade). It delivers 0.2 Ω typical dynamic impedance and supports 1–100 mA sink current, widely used in isolated feedback loops of AC/DC adapters and servo drive control modules.
For engineers reviewing the TL432BCPK datasheet, TL432BCPK pinout, TL432BCPK application, or TL432BCPK equivalent, key selection considerations include its Q-grade thermal stability (−40°C to 125°C), SOT-89 thermal performance (RθJA = 52°C/W), cathode-to-anode voltage regulation range, and distinct PK-package pinout versus TL431 variants.
Technical Context
The TL432BCPK implements a three-terminal adjustable shunt regulator architecture with an internal precision reference amplifier and NPN output stage. Its REF pin senses voltage relative to ANODE, triggering cathode current sink when input exceeds Vref, enabling precise closed-loop regulation without external op-amps.
Unlike TL431, the TL432 family uses inverted pinout in PK (SOT-89) packaging: Pin 1 = REF, Pin 2 = ANODE, Pin 3 = CATHODE - a deliberate layout optimization for PCB routing in high-density power supply feedback paths and minimizing parasitic inductance in fast-switching converters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Vref tolerance | ±0.5% at 25°C (B grade) - ensures ≤12.5 mV error in 2.5 V reference setting for tight feedback accuracy |
| Temp range | −40°C to 125°C (Q grade) - qualified for under-hood automotive and industrial servo drive environments |
| Vref drift | 14 mV max over full temperature range - enables stable regulation without external compensation in wide-temp designs |
| Dynamic impedance | 0.2 Ω typical - maintains low output impedance up to 100 kHz, critical for suppressing switching noise in SMPS feedback |
| Cathode current | 1–100 mA sink capability - supports direct driving of optocoupler LEDs or error amplifier inputs without buffer stages |
| Output noise | Low broadband noise (typ. 20 µVRMS over 10 Hz–10 kHz) - minimizes jitter injection into PWM controllers |
| Package | SOT-89 (PK) - 4.5 mm × 2.5 mm footprint with exposed thermal pad; RθJA = 52°C/W enables >1 W dissipation at 50°C ambient |
Pinout & Package
SOT-89 (PK) package: 3-pin surface-mount with exposed thermal pad on underside; body size 4.5 mm × 2.5 mm × 1.5 mm; designed for high-power density and efficient heat transfer to PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (REF) | Reference input | High-impedance sense node; connects to voltage divider output; sets regulation threshold relative to ANODE |
| Pin 2 (ANODE) | Common return | Must be connected to system ground or lowest potential node; serves as voltage reference point for REF and CATHODE |
| Pin 3 (CATHODE) | Current sink output | Drives external load (e.g., optocoupler LED); sinks current proportional to REF–ANODE voltage error |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable reference range | 2.483 V to 36 V via two-resistor divider - eliminates need for multiple fixed-voltage references in multi-output supplies |
| Sharp turn-on characteristic | Sub-µs response to reference threshold crossing - enables stable regulation even with fast transient loads in DC/DC converters |
| Low output impedance | 0.2 Ω typical - sustains regulation accuracy despite varying cathode current (1–100 mA), reducing loop gain dependency |
| Thermal stability | 14 mV max Vref deviation over −40°C to 125°C - avoids recalibration in industrial motor drives operating across ambient extremes |
| ESD robustness | ±2000 V HBM - withstands handling and board assembly without special ESD precautions |
Applications
| AC/DC Power Adapter | Servo Drive Control Module |
|---|---|
|
Use Scenario: Secondary-side voltage sensing in isolated flyback converters for notebook PC adapters. IC Role / Device Role / Timing Role: Shunt reference providing precise feedback to optocoupler, closing regulation loop across transformer barrier. Use Value: 0.5% Vref tolerance and 14 mV temp drift ensure ±1% output voltage accuracy over full operating range without trimming. |
Use Scenario: Voltage monitoring and current limit threshold generation in industrial servo amplifier power stages. IC Role / Device Role / Timing Role: Adjustable reference setting overcurrent trip point and bus voltage regulation thresholds. Use Value: 36 V max cathode voltage rating and Q-grade temp range support direct connection to 24–48 V DC bus with no level-shifting. |
| Rack Server PSU | Industrial AC Inverter |
|
Use Scenario: Precision output voltage trimming and margining in 12 V/54 V intermediate bus converters. IC Role / Device Role / Timing Role: Programmable reference for DAC-controlled feedback networks enabling digital PMBus voltage adjustment. Use Value: Low 0.2 Ω dynamic impedance maintains loop stability during rapid digital voltage steps, preventing overshoot. |
Use Scenario: DC link voltage sensing and protection circuitry in variable-frequency motor drives. IC Role / Device Role / Timing Role: High-voltage shunt reference generating fault thresholds for IGBT gate drivers and MCU ADC inputs. Use Value: 37 V absolute max cathode voltage rating and 100 mA sink current allow direct interface with 600 V DC link via resistive divider. |
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 B-grade accuracy and Q-temp range, but TL431 pinout (REF–CATHODE–ANODE) | Requires PCB layout revision due to reversed REF/CATHODE pins; not drop-in compatible | Select only if legacy TL431 layout reuse is prioritized over TL432's optimized feedback routing |
| TLVH431BQDBVR | Lower 1.24 V reference, 0.5% accuracy, SOT-23-5 package; higher 30 V max cathode voltage | Not suitable for >30 V applications; lacks Q-grade extended temp support (only −40°C to 105°C) | Prefer for low-voltage, space-constrained designs where 2.5 V reference is unnecessary |
Compared with TL431BQPK and TLVH431BQDBVR, TL432BCPK provides unique SOT-89 thermal performance (52°C/W) and TL432-specific pinout that simplifies optocoupler feedback trace routing - making it optimal for high-reliability, thermally demanding 24–48 V industrial power systems.
Availability
TL432BCPK is available at Aetrix Electronics and suitable for rack server power, industrial AC/DC, servo drive control module, and AC inverter & VF drive applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TL432BCPK 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 design and industrial-grade qualification.
The TL43x family was engineered for high-accuracy, high-stability voltage regulation in safety-critical power conversion systems - emphasizing thermal robustness, long-term drift immunity, and seamless integration into isolated feedback architectures.
FAQ
What is the reference voltage tolerance of TL432BCPK at 25°C?
The TL432BCPK has a reference voltage tolerance of ±0.5% at 25°C, corresponding to a Vref range of 2.483 V to 2.507 V under standard test conditions (VKA = Vref, IKA = 10 mA). This B-grade accuracy is specified in Section 6.11 of the TI SLVS543S datasheet and applies exclusively to the TL432BCPK variant with Q-temperature grading.
How does TL432BCPK differ from TL431 in pin configuration?
The TL432BCPK uses a reversed pinout versus TL431 in the SOT-89 (PK) package: Pin 1 = REF, Pin 2 = ANODE, Pin 3 = CATHODE. In contrast, TL431BQPK assigns Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE. This TL432-specific arrangement reduces trace inductance in feedback paths and improves layout efficiency for optocoupler-based isolation schemes.
What is the maximum operating temperature range for TL432BCPK?
The TL432BCPK is rated for operation from −40°C to 125°C, meeting the Q-grade specification defined in TI's device nomenclature. This extended temperature range is validated per Section 6.7 (TL432Q characteristics) and supports deployment in under-hood automotive modules, industrial motor drives, and telecom rectifiers where ambient temperatures exceed 85°C.
Can TL432BCPK replace a Zener diode in voltage regulation circuits?
Yes, TL432BCPK is explicitly designed as a precision replacement for Zener diodes in shunt regulation applications. Its 0.2 Ω dynamic impedance, sharp turn-on characteristic, and 0.5% initial tolerance provide superior regulation accuracy, lower temperature drift, and better noise performance than discrete Zeners - especially in adjustable supplies and isolated feedback loops where TL432BCPK is commonly deployed.
What thermal performance does the SOT-89 package deliver for TL432BCPK?
The TL432BCPK in SOT-89 (PK) package achieves a junction-to-ambient thermal resistance (RθJA) of 52°C/W, as documented in Table 6.3 of the datasheet. This allows ≥1.0 W continuous power dissipation at 50°C ambient - significantly higher than SOIC or SOT-23 variants - making it ideal for high-current feedback applications like servo drive current sensing and high-power AC/DC adapters.
TL432BCPK 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:
- ±0.5%
- 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
TL432BCPK FAQ
1.How can I place an order for TL432BCPK through Aetrix?
Please submit a Request for Quotation (RFQ) for TL432BCPK 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 TL432BCPK reliable?
The price and inventory of TL432BCPK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL432BCPK is usually 5 days.
3.What payment methods are accepted for TL432BCPK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL432BCPK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL432BCPK?
TL432BCPK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL432BCPK 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 TL432BCPK?
For technical support, including TL432BCPK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL432BCPK requirements.
6.How does Aetrix verify that TL432BCPK is sourced from the original manufacturer or authorized distributors?
All TL432BCPK 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 TL432BCPK meets industry standards.
7.What is the process for return or replacement of TL432BCPK?
All TL432BCPK units undergo pre-shipment inspection (PSI). If there is an issue with TL432BCPK, 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 TL432BCPK part is unused and in its original packaging.
Return procedure for TL432BCPK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL432BCPK Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
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LM4040CYM3-2.5-TR
Microchip Technology
-
LM4040CYM3-4.1-TR
Microchip Technology
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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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