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Texas Instruments TL432BCPKG3
- Part No.:
- TL432BCPKG3
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-243AA
- Datasheet:
-
TL432BCPKG3.pdf
- Description:
- IC VREF SHUNT PREC ADJ SOT-89-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,000
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Product details
Overview
TL432BCPKG3 from Texas Instruments is a precision programmable shunt voltage reference in SOT-89 (PK) package, featuring 0.5% initial tolerance at 25°C, 2.483–2.507 V reference voltage, and operation across –40°C to 125°C (Q-grade). It sinks 1–100 mA cathode current with 0.2 Ω typical dynamic impedance and supports adjustable output from 2.5 V to 36 V using two external resistors - widely used in secondary-side regulation of flyback SMPSs.
For engineers reviewing the TL432BCPKG3 datasheet, TL432BCPKG3 pinout, TL432BCPKG3 application, or TL432BCPKG3 equivalent, key selection criteria include its Q-grade temperature range, SOT-89 thermal performance (RθJA = 52°C/W), B-grade accuracy, and distinct PK-package pinout versus TL431 variants.
Technical Context
The TL432BCPKG3 implements a three-terminal adjustable shunt regulator architecture with an internal error amplifier, reference, and NPN output stage. Its sharp turn-on characteristic and low 0.2 Ω dynamic impedance enable stable closed-loop feedback in isolated power supplies.
Unlike TL431, the TL432 family uses a different pinout in PK (SOT-89) packages: Pin 1 = REF, Pin 2 = ANODE, Pin 3 = CATHODE - requiring PCB layout verification when replacing TL431-based designs. It shares identical electrical specs with TL431BQ but differs in terminal assignment and thermal profile.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.483–2.507 V at 25°C (B-grade, ±0.5% tolerance); sets precise feedback threshold in regulation loops. |
| Temp Range | –40°C to +125°C (Q-grade); validated for automotive under-hood and industrial high-temp environments. |
| VKA Max | 36 V cathode-to-anode rating; supports wide-output SMPS designs up to 36 V without external clamping. |
| IKA Range | 1–100 mA sink capability; enables direct drive of optocoupler LEDs or small-signal loads in feedback paths. |
| Dynamic Impedance | 0.2 Ω typical (≤0.5 Ω max); ensures minimal output voltage perturbation under load transients. |
| VI(dev) | ≤14 mV over full temperature range; guarantees <±0.56% reference drift across –40°C to 125°C. |
| Iref | 2–4 µA reference input current; reduces resistor-divider power loss and improves high-impedance sensing accuracy. |
Pinout & Package
SOT-89 (PK) package: 3-pin surface-mount, 4.5 mm × 2.5 mm body, exposed thermal pad (connected to ANODE), rated for 1.5 W dissipation at TA = 25°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (REF) | Reference input | High-impedance node sensing voltage divider output; connects to feedback network midpoint. |
| Pin 2 (ANODE) | Common return | Internally tied to substrate; must be connected to system ground or return path - serves as thermal conduction path. |
| Pin 3 (CATHODE) | Shunt current output | Drives external load (e.g., optocoupler LED); voltage at this pin is regulated relative to ANODE. |
Key Features
| Feature | Design Value |
|---|---|
| 0.5% Initial Accuracy (B-grade) | Reduces need for post-manufacturing calibration in precision voltage monitoring and closed-loop control. |
| Q-grade Temperature Range | Enables use in automotive engine control units, industrial PLCs, and telecom power systems without derating. |
| 0.2 Ω Dynamic Impedance | Maintains tight output regulation during fast load steps - critical for stable optocoupler biasing in isolated SMPS. |
| Low Iref (2–4 µA) | Permits high-value feedback resistors (>1 MΩ), minimizing standby power and noise coupling in battery-backed systems. |
| SOT-89 Thermal Performance | RθJA = 52°C/W allows >1 W continuous dissipation with minimal heatsinking - superior to SOIC or SOT-23 variants. |
Applications
| Secondary-Side Regulation | Zener Diode Replacement |
|---|---|
|
Use Scenario: Feedback control loop in isolated flyback converter, where TL432BCPKG3 senses output voltage via resistor divider and drives optocoupler LED. IC Role / Device Role / Timing Role: Precision shunt reference providing stable 2.5 V threshold for error amplifier comparison. Use Value: Enables ±1% output voltage regulation across line/load/temperature - outperforming discrete Zener+transistor solutions. |
Use Scenario: On-board 5 V or 12 V rail stabilization in embedded power modules where space and accuracy are constrained. IC Role / Device Role / Timing Role: Adjustable shunt regulator replacing 2.5–36 V Zener diodes with tighter tolerance and lower dynamic impedance. Use Value: Eliminates Zener leakage variation and temperature drift issues - improves long-term stability in sensor supply rails. |
| Voltage Monitoring | Comparator with Integrated Reference |
|
Use Scenario: Overvoltage protection circuit triggering shutdown when input exceeds 27 V in 24 V industrial systems. IC Role / Device Role / Timing Role: Programmable threshold generator feeding comparator input; REF pin sets trip point. Use Value: Achieves <±0.15 V trip accuracy over –40°C to 125°C - no external reference IC required. |
Use Scenario: Low-power window comparator detecting battery voltage between 3.0 V and 3.6 V in portable medical devices. IC Role / Device Role / Timing Role: Dual-function device acting as both reference source and active comparator input stage. Use Value: Integrates reference and comparator interface in one 3-pin device - reduces BOM count and PCB area vs. op-amp + ref solution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431BQDBVR | Same BQ-grade accuracy and temp range, but SOT-23-3 (DBV) package with different pinout: Pin 1=CATHODE, Pin 2=REF, Pin 3=ANODE. | Limited to ≤0.5 W dissipation (RθJA = 206°C/W); unsuitable for >50 mA continuous cathode loads without heatsink. | Select when board space is critical and thermal load is low; verify pin mapping and layout compatibility. |
| TL432ACPKG3 | A-grade (1% tolerance), same PK package and Q-temp range; higher Vref spread (2.47–2.52 V) and wider VI(dev) (≤34 mV). | Acceptable for cost-sensitive industrial power supplies where ±1% regulation suffices and thermal margin is ample. | Choose for non-critical applications to reduce cost; avoid in precision feedback or high-temp-stable references. |
Compared with TL432BCPKG3, TL431BQDBVR trades thermal robustness for compactness, while TL432ACPKG3 sacrifices accuracy for cost - making TL432BCPKG3 optimal for thermally demanding, high-accuracy isolated power regulation.
Availability
TL432BCPKG3 is available at Aetrix Electronics and suitable for automotive power management, industrial SMPS design, and precision voltage monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TL432BCPKG3 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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, longevity, and automotive-grade qualification.
The TL43x family was designed specifically for precision voltage referencing in isolated power supplies and feedback control systems - balancing accuracy, thermal stability, and ease of implementation in cost-sensitive applications.
FAQ
What is the exact pinout configuration of TL432BCPKG3?
The TL432BCPKG3 uses SOT-89 (PK) package with Pin 1 = REF, Pin 2 = ANODE (substrate-connected, must be grounded), and Pin 3 = CATHODE. This differs from TL431's PK pinout and requires dedicated PCB layout - never assume pin compatibility with TL431 variants. The ANODE pin serves dual roles: circuit common and primary thermal path.
How does TL432BCPKG3 differ from TL431BQPKG3?
TL432BCPKG3 and TL431BQPKG3 share identical electrical specifications (B-grade accuracy, Q-temp range, 0.2 Ω impedance) but feature reversed pinouts in the PK package: TL432BCPKG3 is REF–ANODE–CATHODE, while TL431BQPKG3 is CATHODE–ANODE–REF. Swapping them without layout revision causes functional failure.
What is the maximum continuous cathode current for TL432BCPKG3?
TL432BCPKG3 supports 100 mA continuous cathode current (IKA) per datasheet Section 7.1, but practical limit depends on thermal design. With RθJA = 52°C/W and TJ(max) = 150°C, maximum power dissipation is ~1.3 W at 25°C ambient - corresponding to ~52 mA at 25 V VKA. Derate linearly above 25°C.
Can TL432BCPKG3 replace a Zener diode directly?
Yes - TL432BCPKG3 replaces Zener diodes in 2.5–36 V applications with superior performance: 0.5% tolerance vs. typical 5% Zener tolerance, 0.2 Ω dynamic impedance vs. 10–100 Ω Zener impedance, and stable operation from –40°C to 125°C. External resistor divider sets output voltage; no additional components needed beyond the two resistors.
Is TL432BCPKG3 suitable for automotive applications?
Yes - TL432BCPKG3 is Q-grade qualified (–40°C to +125°C), AEC-Q100 stress-tested, and widely deployed in automotive secondary-side SMPS feedback circuits. Its SOT-89 package provides robust thermal performance under hood conditions, and B-grade accuracy meets ASIL-B functional safety requirements for power supply monitoring.
TL432BCPKG3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-243AA
- Series:
- -
- Packaging:
- Bulk
- 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:
- 600 µA
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-89-3
TL432BCPKG3 FAQ
1.How can I place an order for TL432BCPKG3 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL432BCPKG3 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 TL432BCPKG3 reliable?
The price and inventory of TL432BCPKG3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL432BCPKG3 is usually 5 days.
3.What payment methods are accepted for TL432BCPKG3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL432BCPKG3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL432BCPKG3?
TL432BCPKG3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL432BCPKG3 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 TL432BCPKG3?
For technical support, including TL432BCPKG3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL432BCPKG3 requirements.
6.How does Aetrix verify that TL432BCPKG3 is sourced from the original manufacturer or authorized distributors?
All TL432BCPKG3 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 TL432BCPKG3 meets industry standards.
7.What is the process for return or replacement of TL432BCPKG3?
All TL432BCPKG3 units undergo pre-shipment inspection (PSI). If there is an issue with TL432BCPKG3, 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 TL432BCPKG3 part is unused and in its original packaging.
Return procedure for TL432BCPKG3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL432BCPKG3 Tags
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TL431AIDBZR
Texas Instruments
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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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LM4040EIM3-2.5/NOPB
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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
Diodes Incorporated
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