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Texas Instruments TL432BIPK
- Part No.:
- TL432BIPK
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-243AA
- Datasheet:
-
TL432BIPK.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT89-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,730
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Product details
Overview
TL432BIPK 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 at 25°C, −40°C to +125°C operating range, and 0.2 Ω typical dynamic impedance. It serves as a stable feedback element in isolated DC-DC converters and industrial power supplies.
For engineers reviewing the TL432BIPK datasheet, TL432BIPK pinout, TL432BIPK application, or TL432BIPK equivalent, key selection criteria include its Q-grade temperature rating, PK-package thermal performance (RθJC = 9°C/W), adjustable output (2.5 V to 36 V), and sink-current capability (1–100 mA) in high-reliability power regulation designs.
Technical Context
The TL432BIPK implements a three-terminal adjustable shunt regulator architecture with an internal error amplifier, reference, and NPN output stage. Its cathode-anode-reference terminal configuration enables precise voltage sensing and current sinking without external pass transistors.
Unlike the TL431, the TL432BIPK uses a distinct pinout: Pin 1 = REF, Pin 2 = ANODE, Pin 3 = CATHODE - verified for SOT-89 (PK) package per TI SLVS543S Rev. May 2024. This layout supports direct integration into compact feedback networks where anode grounding simplifies PCB routing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V ±12.5 mV (0.5% B-grade tolerance at 25°C); sets accurate feedback threshold for power supply regulation. |
| Temperature Range | −40°C to +125°C (Q-grade); validated for under-hood automotive and industrial servo drive environments. |
| Dynamic Impedance | 0.2 Ω typical (≤0.5 Ω max); ensures minimal output voltage shift under load transients in closed-loop systems. |
| Sink Current Range | 1 mA to 100 mA; supports direct driving of optocoupler LEDs or error amplifier inputs without buffering. |
| Reference Input Current | 2–4 µA typical; enables high-impedance resistor-divider networks (e.g., 1 MΩ/1 MΩ) with <0.1% error contribution. |
| Output Noise | Low broadband noise (<10 µVRMS over 10 Hz–10 kHz); critical for low-ripple voltage regulation in sensitive analog subsystems. |
| Thermal Resistance | RθJC = 9°C/W (PK package); allows >1.5 W power dissipation at TJ = 125°C with minimal heatsinking in space-constrained modules. |
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 continuous power 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 for regulation setpoint. |
| Pin 2: ANODE | Common return path | Internally tied to substrate; must be connected to system ground or low-impedance return to ensure stable bias and thermal conduction. |
| Pin 3: CATHODE | Current-sink output | Drives optocoupler LED or error amplifier input; voltage at this pin determines regulated output via external resistor network. |
Key Features
| Feature | Design Value |
|---|---|
| 0.5% initial accuracy (B grade) | Reduces calibration overhead in factory-trimmed AC/DC adapters and telecom power modules. |
| −40°C to +125°C operation (Q grade) | Enables single-part qualification across automotive engine control units and industrial motor drives without derating. |
| 0.2 Ω dynamic impedance | Maintains <10 mV output deviation during 50 mA load steps-critical for maintaining tight regulation in flyback converters. |
| Adjustable output (2.5 V to 36 V) | Supports universal input (85–265 VAC) SMPS designs using one reference IC across multiple output voltages. |
| Low 2–4 µA reference current | Permits use of high-value feedback resistors (>1 MΩ), minimizing standby power loss in energy-efficient power supplies. |
Applications
| Rack Server Power | Industrial AC/DC Converter |
|---|---|
Use Scenario: Secondary-side voltage regulation in 48 V intermediate bus converters feeding CPU/GPU VRMs. IC Role / Device Role / Timing Role: Shunt reference providing feedback to optocoupler-driven primary-side controller for isolation and stability. Use Value: 0.5% accuracy and 125°C rating ensure consistent output voltage across full thermal envelope without recalibration. |
Use Scenario: Output voltage sensing in 3 kW industrial rectifier with wide input (380–480 VAC) and 24 V/48 V outputs. IC Role / Device Role / Timing Role: Precision reference in isolated feedback loop, interfacing with TL431-compatible optocouplers (e.g., PC817). Use Value: Low dynamic impedance (0.2 Ω) suppresses ripple-induced regulation error under 10 A load steps. |
| AC Inverter Drive | Servo Drive Control Module |
Use Scenario: DC bus voltage monitoring and overvoltage protection threshold in 7.5 kW VFD with regenerative braking. IC Role / Device Role / Timing Role: Reference input for comparator-based fault detection circuit, triggered at 800 V DC bus level. Use Value: Stable 2.495 V reference enables ±1% OV trip point accuracy across −40°C to +125°C ambient. |
Use Scenario: Feedback reference for dual-output (±15 V) isolated auxiliary supply powering gate drivers and position sensors. IC Role / Device Role / Timing Role: Adjustable shunt regulator setting precise ±15 V outputs via resistor dividers on secondary windings. Use Value: 100 mA sink capability directly drives dual optocouplers without external transistors, reducing BOM count. |
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 rating, but TL431 pinout (REF–CATHODE–ANODE vs TL432's REF–ANODE–CATHODE). | Requires PCB layout revision due to reversed cathode/anode pins; not drop-in compatible. | Select only if legacy TL431 footprint reuse is required and layout modification is acceptable. |
| MAX6007AEUR+T | Fixed 2.5 V output, ±0.2% initial accuracy, 10 ppm/°C drift, 15 µA quiescent current, SOT-23-3 package. | Lacks adjustability; unsuitable for variable-output or >2.5 V applications; lower thermal robustness (−40°C to +85°C). | Prefer for cost-sensitive, fixed-voltage, low-power applications where 2.5 V suffices and extended temperature is not needed. |
Compared with TL432BIPK, TL431BQPK demands board-level redesign due to incompatible pin mapping, while MAX6007AEUR+T trades adjustability and thermal range for tighter initial tolerance and lower quiescent current in fixed-voltage roles.
Availability
TL432BIPK is available at Aetrix Electronics and suitable for rack server power, industrial AC/DC converters, and servo drive control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TL432BIPK 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 voltage references and power management ICs.
The TL43x family was designed for high-accuracy, high-reliability shunt regulation in isolated power supplies, offering pin-compatible alternatives (TL431/TL432) with differentiated pinouts and grade options for automotive, industrial, and telecom applications.
FAQ
What is the exact pin configuration of TL432BIPK in the SOT-89 package?
The TL432BIPK uses Pin 1 = REF, Pin 2 = ANODE, Pin 3 = CATHODE in SOT-89 (PK) package. This differs from TL431's REF–CATHODE–ANODE order. Pin 2 is internally connected to the substrate and must be soldered to ground or left electrically floating per TI SLVS543S Section 5.
Does TL432BIPK support adjustable output voltages above 24 V?
Yes, TL432BIPK supports adjustable output from 2.5 V up to 36 V using two external resistors. The upper limit is constrained by cathode voltage rating (37 V absolute max), confirmed in Section 6.1 of the TI datasheet SLVS543S.
What is the maximum continuous cathode current for TL432BIPK?
The TL432BIPK supports continuous cathode current from 1 mA to 100 mA, as specified in Section 6.4 (Recommended Operating Conditions) and validated across all grades including BQ. Exceeding 100 mA requires thermal derating per RθJA = 52°C/W.
How does the temperature coefficient of TL432BIPK compare to standard TL431 variants?
TL432BIPK (BQ grade) exhibits ≤34 mV total deviation over −40°C to +125°C, equivalent to ~1.2 ppm/°C average drift. This matches TL431BQ performance, as both share identical electrical specs per TI's device comparison table (Section 4).
Can TL432BIPK replace a Zener diode in high-precision applications?
Yes, TL432BIPK replaces Zener diodes in precision applications due to its 0.5% initial tolerance, 0.2 Ω dynamic impedance, and sharp turn-on characteristic. Unlike Zeners, it delivers stable regulation without minimum current requirements below 1 mA.
TL432BIPK 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-89-3
TL432BIPK FAQ
1.How can I place an order for TL432BIPK through Aetrix?
Please submit a Request for Quotation (RFQ) for TL432BIPK 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 TL432BIPK reliable?
The price and inventory of TL432BIPK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL432BIPK is usually 5 days.
3.What payment methods are accepted for TL432BIPK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL432BIPK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL432BIPK?
TL432BIPK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL432BIPK 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 TL432BIPK?
For technical support, including TL432BIPK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL432BIPK requirements.
6.How does Aetrix verify that TL432BIPK is sourced from the original manufacturer or authorized distributors?
All TL432BIPK 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 TL432BIPK meets industry standards.
7.What is the process for return or replacement of TL432BIPK?
All TL432BIPK units undergo pre-shipment inspection (PSI). If there is an issue with TL432BIPK, 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 TL432BIPK part is unused and in its original packaging.
Return procedure for TL432BIPK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL432BIPK 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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