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Texas Instruments TL432QPKG3
- Part No.:
- TL432QPKG3
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-243AA
- Datasheet:
-
TL432QPKG3.pdf
- Description:
- IC VREF SHUNT ADJ 2.2% SOT89-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,000
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Product details
Overview
TL432QPKG3 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), 14–34 mV total temperature drift over −40°C to +125°C, 0.2 Ω dynamic impedance, and 1–100 mA sink-current capability. It serves as a stable feedback element in isolated DC-DC converters for industrial servo drives and automotive-grade power supplies.
For engineers reviewing the TL432QPKG3 datasheet, TL432QPKG3 pinout, TL432QPKG3 application, or TL432QPKG3 equivalent, key selection criteria include its Q-temp automotive qualification, SOT-89 thermal performance (RθJA = 52°C/W), adjustable output (2.5 V to 36 V), low noise, and compatibility with optocoupler-based feedback loops in flyback and forward converters.
Technical Context
The TL432QPKG3 implements a three-terminal adjustable shunt regulator architecture with an internal error amplifier, reference, and output transistor. Its cathode-anode-ref terminal configuration enables precise voltage regulation via external resistor dividers, supporting both fixed and programmable output topologies without requiring external biasing.
Unlike the TL431, the TL432 variant uses a distinct pinout in PK (SOT-89) packaging: Pin 1 = REF, Pin 2 = ANODE, Pin 3 = CATHODE - enabling direct integration into space-constrained, high-reliability power control circuits where thermal dissipation and layout stability are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V (typical), ±0.5% initial accuracy at 25°C - ensures tight output regulation in closed-loop power supplies without trimming. |
| Temp Range | −40°C to +125°C - qualified for under-hood automotive and industrial motor drive applications with no derating required. |
| Dynamic Impedance | 0.2 Ω (typical) - minimizes output voltage perturbation during load transients in feedback networks. |
| Sink Current | 1 mA to 100 mA - supports direct driving of optocoupler LEDs and maintains regulation across wide output power ranges. |
| Temp Drift (VIdev) | 14–34 mV over full range - translates to <±25 ppm/°C average TC, meeting stringent stability requirements in servo position control. |
| Cathode Voltage Max | 36 V - enables use in 24 V and 48 V bus systems with margin for ripple and surge. |
Pinout & Package
SOT-89 (PK) package: 3-pin surface-mount, 4.5 mm × 2.5 mm × 1.5 mm body, exposed thermal pad (connected to ANODE), rated for 1.5 W power dissipation at TA = 25°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (REF) | Reference input | High-impedance threshold node; sets regulation point via external resistor divider; draws only 2–4 µA. |
| Pin 2 (ANODE) | Common return | Internally tied to substrate; must be connected to system ground or low-impedance return path for thermal and noise integrity. |
| Pin 3 (CATHODE) | Shunt current output | Active sink node; delivers regulated current to optocoupler or pass transistor base; handles up to 100 mA continuously. |
Key Features
| Feature | Design Value |
|---|---|
| Q-temp automotive qualification | Specified and tested over −40°C to +125°C ambient, with full electrical characterization per AEC-Q100 stress requirements. |
| Low dynamic impedance | 0.2 Ω typical enables stable loop response in optocoupler-coupled feedback paths without added compensation capacitance. |
| Adjustable output range | 2.5 V to 36 V via two external resistors - eliminates need for multiple fixed-reference parts in multi-rail power designs. |
| Low output noise | Sub-20 µVPP (0.1–10 Hz), <100 nV/√Hz (1 kHz) - preserves signal integrity in precision analog sensing and ADC reference buffering. |
| Thermal robustness | RθJA = 52°C/W (PK package) - allows >1 W continuous dissipation on standard 2-layer PCBs with minimal copper area. |
Applications
| Industrial Servo Drive Control | Rack Server Primary-Side Regulation |
|---|---|
|
Use Scenario: Feedback voltage sensing in isolated 48 V input, 12 V/20 A output flyback converter powering FPGA and ASIC logic rails. IC Role / Device Role / Timing Role: Shunt reference providing stable 2.5 V threshold to optocoupler LED, closing primary-side regulation loop with <±1% output accuracy. Use Value: Enables compliance with IEC 61000-4-5 surge immunity by eliminating secondary-side controller ICs and associated isolation barriers. |
Use Scenario: Secondary-side voltage monitoring in redundant 12 V DC-DC modules for telecom shelf power distribution. IC Role / Device Role / Timing Role: Precision reference for comparator-based overvoltage lockout (OVP) circuit, triggering shutdown within 100 ns of fault detection. Use Value: Guarantees OVP trip point repeatability across temperature and aging, preventing cascading failure in parallel power modules. |
| Automotive HVAC Blower Motor Inverter | AC Inverter VF Drive Feedback |
|
Use Scenario: Closed-loop speed control in 24 V battery-powered HVAC blower using 3-phase inverter with integrated gate driver. IC Role / Device Role / Timing Role: Reference for current-sense amplifier offset calibration and PWM duty-cycle adjustment in real-time torque control loop. Use Value: Maintains <±0.5% current measurement accuracy over full vehicle temperature range, ensuring consistent airflow and NVH performance. |
Use Scenario: Output voltage stabilization in 380 V DC-link to 230 V AC variable-frequency drive for industrial pump control. IC Role / Device Role / Timing Role: Programmable shunt reference setting 2.5 V threshold for analog-to-digital conversion of scaled AC output voltage. Use Value: Enables ±0.2% RMS voltage reporting accuracy required for predictive maintenance algorithms and energy metering compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431QPKG3 | Same Q-temp rating and SOT-89 package, but TL431 pinout (Pin 1 = CATHODE, Pin 2 = ANODE, Pin 3 = REF) - requires PCB layout revision. | Identical thermal and electrical specs; used where legacy TL431 footprint is retained and REF node routing is less sensitive. | Select TL431QPKG3 only if existing layout uses TL431-compatible pin mapping and ANODE grounding strategy matches. |
| MAX6007AEUR+T | Fixed 2.5 V output, ±0.2% initial accuracy, 30 ppm/°C TC, SOT-23-3 package, max 25 mA sink - higher precision but lower current and narrower temp range (−40°C to +85°C). | Not suitable for automotive under-hood or high-current (>25 mA) optocoupler drive; limited to low-power sensor biasing or ADC references. | Choose MAX6007AEUR+T when ultra-low drift and fixed output are prioritized over sink capability and extended temperature operation. |
Compared with TL431QPKG3, TL432QPKG3 offers inverted pinout for improved layout symmetry in optocoupler feedback paths; compared with MAX6007AEUR+T, it trades initial accuracy for wider current range, higher temperature rating, and programmability - making it the preferred choice for industrial and automotive power regulation.
Availability
TL432QPKG3 is available at Aetrix Electronics and suitable for industrial servo drives, automotive HVAC inverters, and rack server power supplies requiring stable component supply with guaranteed long-term availability and automotive-grade traceability.
Supply support for TL432QPKG3 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 automotive-qualified components.
The TL43x family was developed to replace discrete Zener diodes in feedback networks, offering superior thermal stability, lower impedance, and programmable output - specifically targeting high-reliability power conversion in industrial, automotive, and computing applications.
FAQ
What is the exact pinout configuration of TL432QPKG3?
The TL432QPKG3 uses SOT-89 (PK) packaging with Pin 1 = REF, Pin 2 = ANODE (substrate-connected), Pin 3 = CATHODE. This differs from TL431's pinout and must be verified against TI's SLVS543S datasheet Figure 5-1 to avoid layout errors in feedback circuits.
Does TL432QPKG3 support adjustable output voltages above 36 V?
No. TL432QPKG3 has an absolute maximum cathode voltage (VKA) of 36 V per Section 6.1 of the datasheet. Exceeding this risks permanent damage. For higher-voltage applications, external series limiting or clamping is required - TL432QPKG3 itself regulates only up to 36 V.
How does the Q-temp qualification of TL432QPKG3 differ from standard I-temp versions?
TL432QPKG3 is fully characterized and tested from −40°C to +125°C ambient, with all electrical parameters (Vref, Imin, ZKA, VIdev) guaranteed across that range. I-temp versions (e.g., TL432IPKG3) are only rated to +85°C and may exhibit parametric shift or reduced reliability outside that range.
Can TL432QPKG3 directly drive a PC817 optocoupler LED?
Yes. With 1–100 mA sink capability and 0.2 Ω dynamic impedance, TL432QPKG3 can directly bias a PC817 LED (typical forward current 5–20 mA). Designers should verify current-limiting resistor value using VKA = VOUT − VF(LED) and ensure thermal margin at max load.
What is the minimum cathode current required for regulation in TL432QPKG3?
TL432QPKG3 requires a minimum cathode current (Imin) of 0.4 mA to maintain regulation, as specified in Sections 6.7 and 6.13 of the datasheet. Below this, the device exits active regulation and output voltage becomes undefined - critical for low-power standby modes.
TL432QPKG3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-243AA
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-89-3
TL432QPKG3 FAQ
1.How can I place an order for TL432QPKG3 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL432QPKG3 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 TL432QPKG3 reliable?
The price and inventory of TL432QPKG3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL432QPKG3 is usually 5 days.
3.What payment methods are accepted for TL432QPKG3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL432QPKG3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL432QPKG3?
TL432QPKG3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL432QPKG3 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 TL432QPKG3?
For technical support, including TL432QPKG3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL432QPKG3 requirements.
6.How does Aetrix verify that TL432QPKG3 is sourced from the original manufacturer or authorized distributors?
All TL432QPKG3 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 TL432QPKG3 meets industry standards.
7.What is the process for return or replacement of TL432QPKG3?
All TL432QPKG3 units undergo pre-shipment inspection (PSI). If there is an issue with TL432QPKG3, 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 TL432QPKG3 part is unused and in its original packaging.
Return procedure for TL432QPKG3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL432QPKG3 Tags
-
TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
-
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
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LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
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LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
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