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Texas Instruments TL432AIDBVRG4
- Part No.:
- TL432AIDBVRG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TL432AIDBVRG4.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,231
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Product details
Overview
TL432AIDBVRG4 from Texas Instruments is a precision programmable shunt voltage reference in SOT-23-3 package, featuring 1% initial tolerance at 25°C, adjustable output from 2.495 V to 36 V via two external resistors, 0.2 Ω typical dynamic impedance, and operation across –40°C to 85°C. It serves as a Zener diode replacement in secondary-side regulation of flyback SMPSs.
For engineers reviewing the TL432AIDBVRG4 datasheet, TL432AIDBVRG4 pinout, TL432AIDBVRG4 application, or TL432AIDBVRG4 equivalent, key selection criteria include reference voltage accuracy over temperature, cathode current capability (1–100 mA), low output impedance, thermal drift performance (VI(dev) = 14 mV max), and SOT-23-3 footprint compatibility with space-constrained power control designs.
Technical Context
The TL432AIDBVRG4 implements a three-terminal adjustable shunt regulator architecture with an internal precision reference amplifier and NPN pass transistor. Its REF pin senses voltage relative to ANODE, enabling accurate feedback in isolated power supplies without optocoupler compensation lag.
Unlike the TL431, the TL432 variant uses a reversed pinout in SOT-23-3: Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE - a critical layout distinction for PCB design and functional verification in voltage monitoring and comparator-with-integrated-reference applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V (typical), ±1% initial tolerance at 25°C - sets minimum regulation threshold and defines feedback divider ratio accuracy |
| Output Voltage Range | 2.495 V to 36 V - enables wide-range adjustable regulation using R1/R2 resistor network |
| Cathode Current | 1 mA to 100 mA - determines minimum load/sink capability and maximum power dissipation (PD ≤ 360 mW @ 100 mA) |
| Dynamic Impedance | 0.2 Ω (typical) - ensures stable regulation under fast load transients and low output ripple |
| Temp Drift (VI(dev)) | 14 mV (max over –40°C to 85°C) - quantifies worst-case reference voltage deviation across full industrial temperature range |
| Reference Input Current | 2–4 µA - enables high-impedance feedback networks with minimal divider current error |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade power supply and battery management environments |
Pinout & Package
SOT-23-3 (DBV) package, 2.90 mm × 1.30 mm body size, surface-mount, tape-and-reel packaging.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (CATHODE) | Shunt current input / voltage sense node | Connects to regulated output rail; sinks current to maintain reference voltage at REF pin |
| Pin 2 (REF) | Reference threshold input | Compares external voltage divider output to internal 2.495 V bandgap; controls conduction state |
| Pin 3 (ANODE) | Common return / ground reference | Typically connected to system ground or negative rail; defines voltage reference point for REF and CATHODE |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable shunt regulation | Enables precise voltage setting from 2.495 V to 36 V using only two external resistors - eliminates need for multiple fixed-voltage Zeners |
| Sharp turn-on characteristic | Active output circuitry delivers fast, clean switching between off-state and regulation - improves transient response in SMPS feedback loops |
| Low output noise | Minimizes voltage perturbation in sensitive analog circuits and high-resolution ADC references |
| Zener diode replacement | Provides superior thermal stability and tighter tolerance vs. discrete Zeners - reduces calibration overhead in production |
| Industrial temperature grade | Rated for –40°C to +85°C operation - supports reliable deployment in automotive body electronics and industrial PLC power rails |
Applications
| Secondary-Side Flyback Regulation | Voltage Monitoring & Protection |
|---|---|
Use Scenario: Isolated DC-DC converter where primary-side controller lacks direct output sensing. IC Role / Device Role / Timing Role: TL432AIDBVRG4 acts as precision shunt reference on secondary side, feeding optocoupler input to close feedback loop across isolation barrier. Use Value: Enables ±1% output voltage regulation without primary-side compensation redesign; leverages 0.2 Ω impedance for stable optocoupler LED drive. | Use Scenario: Overvoltage detection in 12 V/24 V battery-powered systems with microcontroller supervision. IC Role / Device Role / Timing Role: TL432AIDBVRG4 functions as comparator reference with external resistor divider, triggering MCU GPIO interrupt when threshold exceeded. Use Value: Delivers 1% reference accuracy across –40°C to 85°C - avoids false trips due to temperature-induced drift in safety-critical monitoring. |
| Zener Diode Replacement | Adjustable Linear Regulator Reference |
Use Scenario: On-board 5 V or 3.3 V regulation in space-constrained embedded systems. IC Role / Device Role / Timing Role: TL432AIDBVRG4 replaces 5.1 V Zener diode in shunt regulator configuration with series pass transistor. Use Value: Reduces total solution size by 40% (SOT-23-3 vs. DO-35); improves long-term stability with <14 mV temp drift vs. >50 mV for standard Zeners. | Use Scenario: Programmable bench power supply requiring user-selectable output voltages. IC Role / Device Role / Timing Role: TL432AIDBVRG4 provides stable, adjustable reference to op-amp error amplifier controlling series pass element. Use Value: Supports 0.1 V resolution across 2.5–30 V range using 10-turn potentiometer; maintains <0.5% line/load regulation due to low dynamic impedance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDBVR | Same SOT-23-3 package but TL431 pinout (Pin 1 = REF, Pin 2 = ANODE, Pin 3 = CATHODE); 1% tolerance; identical electrical specs except pin assignment. | Requires PCB layout revision due to reversed pinout; not drop-in compatible despite identical function and rating. | Select TL431ACDBVR only if redesigning layout or migrating from legacy TL431-based designs. |
| TLVH431ILP | Lower 1.24 V reference voltage; 0.5% initial accuracy; higher 70 µA max Iref; rated for –40°C to 125°C. | Better suited for low-voltage systems (e.g., 1.8 V/2.5 V rails); requires different resistor scaling; higher quiescent current affects ultra-low-power designs. | Choose TLVH431ILP when reference voltage below 2.4 V is required or extended temperature range beyond 85°C is mandatory. |
Compared with TL431ACDBVR, TL432AIDBVRG4 offers identical regulation performance but mandates attention to pinout reversal - critical for first-pass board success. Versus TLVH431ILP, TL432AIDBVRG4 provides higher reference voltage and lower Iref, making it preferable for mid-voltage industrial supplies where power efficiency and noise immunity are prioritized.
Availability
TL432AIDBVRG4 is available at Aetrix Electronics and suitable for industrial power supplies, battery management systems, and isolated DC-DC converters requiring stable component supply with guaranteed long-term sourcing.
Supply support for TL432AIDBVRG4 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 leadership in precision reference and power management ICs.
The TL43x family was designed specifically for high-accuracy, low-drift voltage referencing in isolated and non-isolated power conversion, offering pin-compatible alternatives across grades and packages to simplify design scalability.
FAQ
What is the exact pinout configuration of TL432AIDBVRG4 in the SOT-23-3 package?
TL432AIDBVRG4 uses the TL432-specific SOT-23-3 pinout: Pin 1 is CATHODE, Pin 2 is REF, and Pin 3 is ANODE. This differs from TL431 (Pin 1 = REF, Pin 2 = ANODE, Pin 3 = CATHODE). Confirming this orientation is essential before PCB layout - misalignment causes immediate functional failure in feedback circuits.
Does TL432AIDBVRG4 support operation at 125°C ambient temperature?
No. TL432AIDBVRG4 is an 'I'-grade device rated for –40°C to +85°C operating free-air temperature. For 125°C operation, select TL432BQDBVR or TL432AQDBVR - both Q-grade variants qualified across –40°C to +125°C and sharing identical electrical specs and pinout.
What is the minimum cathode current required for regulation in TL432AIDBVRG4?
The minimum cathode current (Imin) for stable regulation in TL432AIDBVRG4 is 0.4 mA (typical) and 0.6 mA (max) at 25°C. Maintaining ≥0.6 mA ensures reliable turn-on and prevents reference dropout during light-load conditions in SMPS feedback networks.
Can TL432AIDBVRG4 replace a standard 5.1 V Zener diode directly?
Yes - TL432AIDBVRG4 can replace a 5.1 V Zener in shunt regulator configurations by setting R1 and R2 to yield VOUT = 2.495 × (1 + R1/R2) = 5.1 V. Its 1% tolerance, 0.2 Ω impedance, and 14 mV temp drift significantly outperform typical 5% Zeners, improving system accuracy and thermal stability.
What is the dynamic impedance specification for TL432AIDBVRG4 and why does it matter?
TL432AIDBVRG4 has a typical dynamic impedance of 0.2 Ω (measured at f ≤1 kHz, IKA = 1–100 mA). This low value ensures minimal output voltage variation under changing load or line conditions - critical for maintaining tight regulation in switching power supplies and reducing noise coupling into sensitive analog subsystems.
TL432AIDBVRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- SC-74A, SOT-753
- 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:
- ±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-23-5
TL432AIDBVRG4 FAQ
1.How can I place an order for TL432AIDBVRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL432AIDBVRG4 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 TL432AIDBVRG4 reliable?
The price and inventory of TL432AIDBVRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL432AIDBVRG4 is usually 5 days.
3.What payment methods are accepted for TL432AIDBVRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL432AIDBVRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL432AIDBVRG4?
TL432AIDBVRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL432AIDBVRG4 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 TL432AIDBVRG4?
For technical support, including TL432AIDBVRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL432AIDBVRG4 requirements.
6.How does Aetrix verify that TL432AIDBVRG4 is sourced from the original manufacturer or authorized distributors?
All TL432AIDBVRG4 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 TL432AIDBVRG4 meets industry standards.
7.What is the process for return or replacement of TL432AIDBVRG4?
All TL432AIDBVRG4 units undergo pre-shipment inspection (PSI). If there is an issue with TL432AIDBVRG4, 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 TL432AIDBVRG4 part is unused and in its original packaging.
Return procedure for TL432AIDBVRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL432AIDBVRG4 Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
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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
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