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Texas Instruments TL432IDBVRG4
- Part No.:
- TL432IDBVRG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TL432IDBVRG4.pdf
- Description:
- IC VREF SHUNT ADJ 2.2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,209
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Product details
Overview
TL432IDBVRG4 from Texas Instruments is a precision programmable shunt voltage reference in SOT-23-3 package, delivering 2.495 V nominal reference voltage with ±0.5% initial tolerance (B grade), 14 mV max full-range temperature drift (−40°C to 85°C), 0.2 Ω typical dynamic impedance, and 1–100 mA sink-current capability. It serves as an adjustable voltage reference in secondary-side regulation of isolated flyback converters.
For engineers reviewing the TL432IDBVRG4 datasheet, TL432IDBVRG4 pinout, TL432IDBVRG4 application, or TL432IDBVRG4 equivalent, key selection criteria include its I-grade temperature range, SOT-23-3 pinout distinct from TL431, low output impedance for stable feedback loops, and Zener-replacement suitability in space-constrained power supplies.
Technical Context
The TL432IDBVRG4 implements a three-terminal adjustable shunt regulator architecture with internal error amplifier, reference, and NPN output stage. Its REF–ANODE–CATHODE pinout (Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE) differs from TL431, requiring PCB layout revision when substituting.
It operates over −40°C to +85°C (I-grade), supports cathode voltages from 2.5 V to 36 V, and maintains regulation with minimum 0.4 mA cathode current. The device achieves sharp turn-on via active output circuitry and exhibits low 2–4 µA reference input current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V ±0.5% at 25°C - enables precise 2.5 V system reference with minimal calibration overhead |
| Temp Range | −40°C to +85°C - qualified for industrial ambient environments without derating |
| Temp Drift | ≤14 mV over full range - ensures ≤0.56% reference deviation across operating temperature |
| Dynamic Impedance | 0.2 Ω typical - provides stable feedback node impedance in SMPS error amplifiers |
| Sink Current | 1–100 mA - supports direct drive of optocoupler LEDs in isolated feedback paths |
| Ref Input Current | 2–4 µA - minimizes resistor-divider loading error in high-impedance voltage setting networks |
| Min Cathode Current | 0.4 mA - allows reliable regulation even under light-load conditions |
Pinout & Package
SOT-23-3 package (2.90 mm × 1.30 mm body), surface-mount, tape-and-reel. Pin 1 = CATHODE (shunt current input), Pin 2 = REF (2.495 V threshold input), Pin 3 = ANODE (common return, typically grounded).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (CATHODE) | Shunt current input | Connects to regulated output node; sinks current to maintain reference voltage at REF pin |
| Pin 2 (REF) | Reference threshold input | Internal 2.495 V comparator input; voltage divider from output to ground sets regulation point |
| Pin 3 (ANODE) | Common return | Typically connected to system ground or low-side return path; defines reference potential |
Key Features
| Feature | Design Value |
|---|---|
| 0.5% initial voltage tolerance | Reduces need for post-manufacturing trimming in precision power supplies |
| Sharp turn-on characteristic | Enables clean switching behavior in comparator-mode applications like voltage monitoring |
| Low 2–4 µA reference input current | Lowers power loss and voltage error in high-resistance feedback dividers |
| 0.2 Ω dynamic output impedance | Minimizes output voltage variation under dynamic load transients in closed-loop regulation |
| Zener diode replacement capability | Provides superior thermal stability and tighter tolerance vs. discrete Zeners in same footprint |
Applications
| Adjustable Power Supply Reference | Isolated Flyback Secondary Regulation |
|---|---|
Use Scenario: Setting output voltage of a non-isolated buck converter using external resistor divider. IC Role / Device Role / Timing Role: Precision shunt reference providing stable 2.495 V threshold for error amplifier feedback. Use Value: Enables ±1% output accuracy over temperature without trimming, leveraging 0.5% initial tolerance and 14 mV drift. | Use Scenario: Regulating output voltage on secondary side of isolated flyback converter via optocoupler feedback. IC Role / Device Role / Timing Role: Shunt reference driving optocoupler LED; cathode current modulated by primary-side controller. Use Value: Delivers stable regulation despite transformer coupling variation, supported by 1–100 mA sink range and low dynamic impedance. |
| Voltage Monitoring Threshold | Zener Diode Replacement |
Use Scenario: Detecting undervoltage condition in microcontroller supply rail before brownout reset. IC Role / Device Role / Timing Role: Comparator with integrated reference; REF pin tied to monitored rail, ANODE grounded, CATHODE pulled up. Use Value: Eliminates need for external reference IC; sharp turn-on ensures clean transition at 2.495 V threshold. | Use Scenario: Replacing 2.5 V Zener diode in low-power linear regulator feedback network. IC Role / Device Role / Timing Role: Active shunt regulator replacing passive Zener, with REF–ANODE–CATHODE topology. Use Value: Improves temperature coefficient from ~5000 ppm/°C (Zener) to <570 ppm/°C (TL432), enhancing long-term stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431IDBVR | Different pinout (REF–ANODE–CATHODE vs. TL432's CATHODE–REF–ANODE); identical electrical specs | Requires PCB layout change; not drop-in compatible due to reversed terminal order | Select TL431IDBVR only if redesigning layout to match TL431 pin assignment |
| TLVH431IDBVR | Lower 1.24 V reference voltage; 2% initial tolerance; higher 10 µA reference current | Better suited for low-voltage systems (<3 V); less precise but lower quiescent current in some configurations | Choose TLVH431IDBVR when 1.24 V reference or wider input range down to 2.5 V is required |
Compared with TL431IDBVR, TL432IDBVRG4 offers identical performance but mandates pinout-aware layout; versus TLVH431IDBVR, it delivers tighter tolerance and lower reference current at the cost of higher minimum cathode voltage (2.5 V vs. 2.5 V absolute, but functional down to ~2.7 V due to headroom).
Availability
TL432IDBVRG4 is available at Aetrix Electronics and suitable for industrial power supplies, isolated DC-DC converters, and embedded voltage monitoring systems requiring stable component supply with guaranteed long-term sourcing.
Supply support for TL432IDBVRG4 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 specializing in analog and embedded processing technologies, with leadership in precision analog ICs and power management solutions.
The TL43x family was designed for high-accuracy voltage referencing in power conversion, instrumentation, and safety-critical feedback loops-emphasizing thermal stability, low noise, and robust operation across automotive, industrial, and commercial temperature grades.
FAQ
What is the reference voltage tolerance of TL432IDBVRG4 at 25°C?
The TL432IDBVRG4 has a reference voltage tolerance of ±0.5% at 25°C, corresponding to a 2.495 V nominal value with a range of 2.483 V to 2.507 V. This B-grade specification is confirmed in Section 7.11 of the SLVS543P datasheet and applies specifically to the TL432IDBVRG4 variant with I-grade temperature rating and SOT-23-3 packaging.
How does the TL432IDBVRG4 pinout differ from TL431IDBVR?
The TL432IDBVRG4 uses a CATHODE–REF–ANODE pinout (Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE), whereas TL431IDBVR uses REF–ANODE–CATHODE. This reversal means TL432IDBVRG4 is not pin-compatible with TL431IDBVR and requires PCB layout modification. The difference is explicitly documented in the "Device Comparison Table" and "Pin Configuration" sections of the TI datasheet.
What is the maximum cathode voltage rating for TL432IDBVRG4?
The TL432IDBVRG4 has an absolute maximum cathode voltage (VKA) rating of 37 V, with recommended operating range from Vref (≈2.5 V) to 36 V. This limit is specified in Section 7.1 "Absolute Maximum Ratings" and ensures safe operation when used in high-voltage feedback networks or as a shunt clamp above standard logic rails.
Can TL432IDBVRG4 operate at −40°C?
Yes, TL432IDBVRG4 is rated for operation from −40°C to +85°C (I-grade). Its electrical characteristics-including reference voltage drift (≤14 mV), dynamic impedance (0.2 Ω), and sink-current capability (1–100 mA)-are fully specified across this range per Sections 7.6 and 7.12 of the datasheet, making it suitable for industrial ambient environments.
What is the typical dynamic impedance of TL432IDBVRG4 and why does it matter?
The TL432IDBVRG4 has a typical dynamic impedance of 0.2 Ω, measured at frequencies ≤1 kHz with cathode current between 1 mA and 100 mA. This low value stabilizes the feedback node in switching power supplies by minimizing voltage perturbation during transient load changes-critical for maintaining tight output regulation in flyback and forward converters.
TL432IDBVRG4 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:
- ±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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
TL432IDBVRG4 FAQ
1.How can I place an order for TL432IDBVRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL432IDBVRG4 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 TL432IDBVRG4 reliable?
The price and inventory of TL432IDBVRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL432IDBVRG4 is usually 5 days.
3.What payment methods are accepted for TL432IDBVRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL432IDBVRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL432IDBVRG4?
TL432IDBVRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL432IDBVRG4 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 TL432IDBVRG4?
For technical support, including TL432IDBVRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL432IDBVRG4 requirements.
6.How does Aetrix verify that TL432IDBVRG4 is sourced from the original manufacturer or authorized distributors?
All TL432IDBVRG4 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 TL432IDBVRG4 meets industry standards.
7.What is the process for return or replacement of TL432IDBVRG4?
All TL432IDBVRG4 units undergo pre-shipment inspection (PSI). If there is an issue with TL432IDBVRG4, 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 TL432IDBVRG4 part is unused and in its original packaging.
Return procedure for TL432IDBVRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL432IDBVRG4 Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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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
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AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
Texas Instruments
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LM4041DIM3-ADJ/NOPB
Texas Instruments
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LM4040DIM3X-2.5/NOPB
Texas Instruments
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LM4040DIM3-2.5/NOPB
Texas Instruments
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AZ431LANTR-G1
Diodes Incorporated
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