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Texas Instruments TL432LIAIDBZR
- Part No.:
- TL432LIAIDBZR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL432LIAIDBZR.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,805
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Product details
Overview
TL432LIAIDBZR from Texas Instruments is a three-terminal adjustable shunt regulator with 1% initial reference voltage tolerance at 25°C, 2.495 V nominal reference voltage, 0.3 Ω typical dynamic impedance, −40°C to +125°C operating temperature range (Q-temp grade), and 1 mA minimum cathode current for regulation - used in secondary-side flyback SMPS feedback loops, precision current sinks, and Zener diode replacement circuits.
For engineers reviewing the TL432LIAIDBZR datasheet, TL432LIAIDBZR pinout, TL432LIAIDBZR application, or TL432LIAIDBZR equivalent, this page delivers verified electrical specifications, Q-temp automotive-grade thermal performance, DBZ SOT-23 package terminal mapping, and direct functional alternatives for voltage reference and error amplifier designs.
Technical Context
The TL432LIAIDBZR implements an internal 2.495 V bandgap reference and high-gain op-amp driving a Darlington output stage, enabling precise shunt regulation via external resistor feedback between cathode and reference pins. Its open-loop comparator mode supports voltage monitoring with integrated reference.
Unlike the TL431LI, the TL432LIAIDBZR uses reversed REF/CATHODE pin assignment in the DBZ package (Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE), while maintaining identical electrical behavior, IREF ≤ 0.4 µA, and II(dev) ≤ 0.3 µA across −40°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage (Vref) | 2.495 V nominal; ±1% initial tolerance at 25°C ensures stable setpoint for feedback networks |
| Cathode Voltage Range (VKA) | 2.495 V to 36 V; enables wide-range programmable output without external reference |
| Dynamic Impedance (|ZKA|) | 0.3 Ω typical; minimizes output voltage deviation under load transients |
| Reference Input Current (IREF) | ≤ 0.4 µA max; reduces resistor-divider loading error in high-impedance feedback paths |
| Min Cathode Current (Imin) | 1 mA max; defines lowest usable sink current to maintain regulation |
| Temp Drift (VI(dev)) | 27 mV max over −40°C to +125°C; guarantees <±22 ppm/°C average TC for Q-temp operation |
| Output Sink Capability (IKA) | 15 mA max continuous; supports direct drive of optocoupler LEDs or small-signal loads |
Pinout & Package
TL432LIAIDBZR is housed in a 3-pin SOT-23 (DBZ) package measuring 2.90 mm × 1.30 mm, optimized for space-constrained industrial and automotive PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE (Pin 1) | Shunt current output / voltage sense node | Primary current sink path; connects to feedback divider top node and power rail in shunt regulator configuration |
| REF (Pin 2) | Reference input threshold | Senses voltage relative to ANODE; must be biased ≥0.4 µA to activate regulation; determines output setpoint with R1/R2 |
| ANODE (Pin 3) | Common return / ground reference | Low-impedance return path for cathode current and reference bias; tied to system ground or negative rail |
Key Features
| Feature | Design Value |
|---|---|
| Optimized reference current | IREF ≤ 0.4 µA enables high-resistor feedback networks without accuracy loss |
| Low temperature drift | VI(dev) ≤ 27 mV over −40°C to +125°C ensures stable regulation in engine control units |
| Pinout differentiation | DBZ package swaps REF/CATHODE vs TL431LI - prevents layout errors in new designs |
| Internal compensation | Stable without output capacitor; simplifies design in isolated DC/DC feedback paths |
| High sink gain | Darlington output delivers 15 mA sink with sharp turn-on for fast optocoupler response |
Applications
| Secondary-Side SMPS Regulation | Zener Diode Replacement |
|---|---|
Use Scenario: Isolated flyback converter where TL432LIAIDBZR senses output voltage via resistive divider and drives optocoupler LED to regulate primary-side controller. IC Role / Device Role / Timing Role: Precision shunt regulator acting as error amplifier and voltage reference in closed-loop feedback path. Use Value: Enables ±1% output regulation over line/load/temperature using only two external resistors and one optocoupler. | Use Scenario: On-board 3.3 V rail stabilization replacing 2.5 V Zener diode with tighter tolerance and lower dynamic impedance. IC Role / Device Role / Timing Role: Adjustable shunt reference providing programmable clamping voltage with active regulation. Use Value: Reduces voltage drift by >5× versus standard Zener diodes and eliminates leakage sensitivity to temperature. |
| Precision Constant Current Sink | Voltage Monitoring Comparator |
Use Scenario: LED driver or sensor bias circuit requiring 100 mA constant current with <±2% total error across temperature. IC Role / Device Role / Timing Role: Reference-controlled current regulator using external pass transistor and sense resistor. Use Value: Achieves current accuracy dominated by TL432LIAIDBZR's 1% Vref and resistor tolerance - no external reference IC needed. | Use Scenario: Microcontroller supply rail undervoltage lockout (UVLO) detection at 4.75 V threshold in automotive body control module. IC Role / Device Role / Timing Role: Open-loop comparator with built-in 2.495 V reference comparing divided rail voltage. Use Value: Eliminates discrete reference + comparator IC; trip point set by resistor ratio with <±10 mV hysteresis achievable. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431LIAIDBZR | Identical electrical specs but TL431LI pinout (Pin 1 = REF, Pin 2 = CATHODE) | Requires PCB layout revision due to swapped REF/CATHODE terminals | Select when reusing existing TL431LI footprints or legacy schematics |
| TL432LIBIDBZR | Same pinout and package, but 0.5% initial Vref tolerance (B-grade) instead of 1% (A-grade) | Better accuracy for high-precision references; higher cost and tighter temp drift spec (17 mV) | Select when system-level accuracy demands <±0.5% reference stability at 25°C |
Compared with TL431LIAIDBZR, TL432LIAIDBZR avoids layout redesign for new projects needing reversed pinout compatibility, while TL432LIBIDBZR trades cost for tighter initial tolerance - all three share identical Q-temp rating, dynamic impedance, and IREF performance.
Availability
TL432LIAIDBZR is available at Aetrix Electronics and suitable for automotive engine control units, industrial power supplies, and telecom DC/DC converters requiring stable component supply with guaranteed Q-temp qualification and long-term lifecycle support.
Supply support for TL432LIAIDBZR 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 company delivering analog and embedded processing solutions, with leadership in power management, signal chain, and high-reliability components.
The TL43xLI family was designed for precision voltage referencing and error amplification in isolated power conversion, battery management, and safety-critical feedback systems - emphasizing low drift, wide temperature operation, and robust ESD immunity.
FAQ
What is the pin configuration of TL432LIAIDBZR in the DBZ package?
The TL432LIAIDBZR uses a 3-pin SOT-23 (DBZ) package with Pin 1 = CATHODE, Pin 2 = REF, and Pin 3 = ANODE. This reversed pinout distinguishes it from TL431LI (Pin 1 = REF, Pin 2 = CATHODE) and prevents accidental substitution without layout verification. The TL432LIAIDBZR datasheet confirms this mapping in Section 6 "Pin Configuration and Functions".
Does TL432LIAIDBZR support operation across automotive temperature ranges?
Yes, TL432LIAIDBZR is qualified for −40°C to +125°C (Q-temp grade), with maximum reference voltage deviation (VI(dev)) of 27 mV across that range. It meets AEC-Q100 stress test requirements for automotive use and is specified for engine control, body electronics, and infotainment power rails per TI's SLVSDQ6A datasheet.
How does TL432LIAIDBZR differ electrically from TL431LIAIDBZR?
TL432LIAIDBZR and TL431LIAIDBZR share identical electrical specifications - including 1% Vref tolerance, 0.3 Ω dynamic impedance, 0.4 µA max IREF, and −40°C to +125°C operation - but differ exclusively in DBZ package pinout. TL432LIAIDBZR swaps REF and CATHODE pins, enabling layout optimization in new designs without altering circuit performance.
Can TL432LIAIDBZR replace a Zener diode directly in a circuit?
Yes, TL432LIAIDBZR functions as an active Zener replacement with superior performance: 0.3 Ω dynamic impedance vs. typical 10–100 Ω for Zeners, ±1% initial tolerance vs. ±5% for standard Zeners, and stable regulation down to 1 mA cathode current. Its adjustable output (2.495 V to 36 V) and low temperature drift make it ideal for precision clamping and referencing where passive Zeners fall short.
What is the minimum cathode current required for TL432LIAIDBZR to regulate properly?
The TL432LIAIDBZR requires a minimum cathode current (Imin) of 1 mA maximum to enter and maintain regulation - meaning regulation is guaranteed if IKA ≥ 1 mA. Below this, open-loop gain drops and output voltage becomes unstable. This value is confirmed in Section 7.4 "Recommended Operating Conditions" and Section 7.5 "Electrical Characteristics" of the TL432LIAIDBZR datasheet.
TL432LIAIDBZR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- 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:
- 15 mA
- Tolerance:
- ±1%
- 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-23-3
TL432LIAIDBZR FAQ
1.How can I place an order for TL432LIAIDBZR through Aetrix?
Please submit a Request for Quotation (RFQ) for TL432LIAIDBZR 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 TL432LIAIDBZR reliable?
The price and inventory of TL432LIAIDBZR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL432LIAIDBZR is usually 5 days.
3.What payment methods are accepted for TL432LIAIDBZR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL432LIAIDBZR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL432LIAIDBZR?
TL432LIAIDBZR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL432LIAIDBZR 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 TL432LIAIDBZR?
For technical support, including TL432LIAIDBZR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL432LIAIDBZR requirements.
6.How does Aetrix verify that TL432LIAIDBZR is sourced from the original manufacturer or authorized distributors?
All TL432LIAIDBZR 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 TL432LIAIDBZR meets industry standards.
7.What is the process for return or replacement of TL432LIAIDBZR?
All TL432LIAIDBZR units undergo pre-shipment inspection (PSI). If there is an issue with TL432LIAIDBZR, 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 TL432LIAIDBZR part is unused and in its original packaging.
Return procedure for TL432LIAIDBZR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL432LIAIDBZR Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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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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