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Texas Instruments TL432AIDBVRE4
- Part No.:
- TL432AIDBVRE4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TL432AIDBVRE4.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,266
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Product details
Overview
TL432AIDBVRE4 from Texas Instruments is a precision programmable shunt voltage reference in SOT-23-5 package, featuring 1% initial tolerance at 25°C (A grade), 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 high-stability replacement for Zener diodes in secondary-side regulation of flyback SMPSs.
For engineers reviewing the TL432AIDBVRE4 datasheet, TL432AIDBVRE4 pinout, TL432AIDBVRE4 application, or TL432AIDBVRE4 equivalent, this page delivers verified electrical specs, validated pin functions, confirmed thermal performance, and real-world implementation context for power supply feedback loops and voltage monitoring circuits.
Technical Context
The TL432AIDBVRE4 implements a three-terminal adjustable shunt regulator architecture with an internal precision reference amplifier and NPN output stage. Its REF pin senses voltage relative to ANODE, triggering cathode current sink when input exceeds Vref - enabling precise closed-loop regulation without external op-amps.
Unlike the TL431, the TL432 variant uses a distinct SOT-23-5 pinout: Pin 1 = NC, Pin 2 = ANODE, Pin 3 = NC, Pin 4 = REF, Pin 5 = CATHODE. This configuration isolates REF from ANODE physically, reducing layout-induced error in high-accuracy feedback paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V (typical), ±1% tolerance at 25°C - ensures stable setpoint for feedback networks in regulated power supplies. |
| Output Voltage Range | 2.495 V to 36 V - adjustable via resistor divider on REF pin, supporting wide-range output programming without external components. |
| Dynamic Impedance | 0.2 Ω (typical) - minimizes output voltage variation under load transients, critical for tight-regulation SMPS designs. |
| Cathode Current Range | 1 mA to 100 mA - provides sufficient sink capability for optocoupler biasing and error amplifier drive in isolated converters. |
| Temperature Range | –40°C to +85°C - qualified for industrial-grade operation, with 14 mV max Vref deviation over full range (I-temp grade). |
| Reference Input Current | 2 µA to 4 µA - ultra-low bias current reduces divider network loading error and improves accuracy in high-impedance configurations. |
| Output Noise | Low - enables clean reference for sensitive analog sensing and ADC reference applications without added filtering. |
Pinout & Package
SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm body, surface-mount, lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (NC) | No internal connection | Must be left unconnected; no routing or grounding required - eliminates parasitic coupling paths. |
| Pin 2 (ANODE) | Common reference node | Serves as circuit ground reference for REF and cathode current return; must connect directly to system GND or feedback common. |
| Pin 3 (NC) | No internal connection | Unused terminal; floating per design - no PCB trace or thermal pad needed. |
| Pin 4 (REF) | Threshold input | Senses voltage relative to ANODE; triggers regulation when VREF ≥ Vref; high-impedance input minimizes divider current error. |
| Pin 5 (CATHODE) | Current sink output | Delivers regulated sink current to external load (e.g., optocoupler LED); voltage at this pin equals programmed output minus drop across series resistor. |
Key Features
| Feature | Design Value |
|---|---|
| 1% Initial Accuracy (A Grade) | Reduces calibration burden in factory-trimmed power supplies and eliminates need for post-assembly trimming resistors. |
| 0.2 Ω Dynamic Output Impedance | Maintains <±5 mV output deviation during 50 mA load steps - essential for maintaining cross-regulation in multi-output flyback designs. |
| 2–4 µA Reference Input Current | Enables use of >1 MΩ resistor dividers, cutting standby power by >90% vs. standard Zener-based references. |
| –40°C to +85°C Operation | Validated performance across industrial ambient conditions without derating - supports deployment in motor drives and PLC modules. |
| Pin-to-Pin Alternative to TL431 | Same electrical behavior as TL431 but with separated REF/ANODE pins in SOT-23-5 - simplifies noise-sensitive PCB layouts in isolated feedback paths. |
Applications
| Secondary-Side Regulation | Zener Diode Replacement |
|---|---|
|
Use Scenario: Feedback control loop in isolated flyback converter powering industrial IoT sensor node. IC Role / Device Role / Timing Role: Shunt reference providing precise voltage threshold to optocoupler LED driver, closing isolation barrier feedback path. Use Value: 1% tolerance and low tempco ensure ±1.5% output stability over –40°C to +85°C, meeting IEC 61000-4-2 immunity requirements. |
Use Scenario: Overvoltage protection circuit in 24 V DC input rail for programmable logic controller. IC Role / Device Role / Timing Role: Adjustable shunt clamp activated above 27.5 V threshold, sinking excess current to prevent downstream damage. Use Value: Sharp turn-on characteristic and 0.2 Ω impedance enable fast response (<100 ns) to transient overvoltage events without oscillation. |
| Voltage Monitoring | Comparator with Integrated Reference |
|
Use Scenario: Brown-out detection in battery-powered medical handheld device with Li-ion pack. IC Role / Device Role / Timing Role: Precision reference feeding comparator input to trigger shutdown when cell voltage drops below 3.0 V. Use Value: 14 mV max Vref drift over temperature ensures consistent trip point across operating range, eliminating false triggers. |
Use Scenario: Threshold detector in automotive cabin temperature controller using NTC thermistor divider. IC Role / Device Role / Timing Role: Provides stable 2.5 V reference to LM393 comparator, converting analog resistance change into digital alert signal. Use Value: Ultra-low 4 µA input current prevents loading error in high-R thermistor networks, preserving measurement linearity. |
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-23-5 package, but TL431 pinout (Pin 1=CATHODE, Pin 2=ANODE, Pin 3=REF); 1% tolerance; identical Vref and tempco specs. | Requires PCB layout revision due to reversed pin assignment - not drop-in compatible with TL432 footprint. | Select when redesigning for legacy TL431 layout compatibility or sourcing continuity in constrained supply chains. |
| TL432AIDBVT | Identical functionality and pinout; differs only in tape-and-reel packaging (DBVT = 250-unit reel vs. DBVRE4 = 3000-unit reel) and moisture sensitivity level (MSL3 vs. MSL1). | No functional or application impact - direct substitution for prototyping or low-volume builds where reel size matters. | Prefer for evaluation or pilot production; TL432AIDBVRE4 remains optimal for high-volume automated assembly. |
Compared with TL431ACDBVR, TL432AIDBVRE4 offers native SOT-23-5 pin separation for cleaner feedback routing, while TL432AIDBVT provides identical performance in smaller reels - making TL432AIDBVRE4 the preferred choice for volume industrial power supply manufacturing where layout integrity and supply chain efficiency are prioritized.
Availability
TL432AIDBVRE4 is available at Aetrix Electronics and suitable for industrial power supplies, battery management systems, and embedded voltage monitoring requiring stable component supply with guaranteed long-term availability and TI-authorized traceability.
Supply support for TL432AIDBVRE4 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 design and power management ICs.
The TL43x family was engineered for high-accuracy voltage referencing in isolated power conversion, offering programmability, low drift, and robust thermal performance - targeting industrial, automotive, and telecom infrastructure applications.
FAQ
What is the reference voltage tolerance of TL432AIDBVRE4 at 25°C?
The TL432AIDBVRE4 has a 1% initial reference voltage tolerance at 25°C, corresponding to the 'A' grade designation. Its typical Vref is 2.495 V, with minimum and maximum values of 2.470 V and 2.520 V respectively under specified test conditions (VKA = Vref, IKA = 10 mA). This tolerance is fully characterized and guaranteed across the production lot.
How does the TL432AIDBVRE4 pinout differ from the TL431 in SOT-23-5 packages?
The TL432AIDBVRE4 uses a dedicated SOT-23-5 pinout: Pin 1 = NC, Pin 2 = ANODE, Pin 3 = NC, Pin 4 = REF, Pin 5 = CATHODE. In contrast, the TL431 in SOT-23-5 (e.g., TL431ACDBVR) assigns Pin 1 = CATHODE, Pin 2 = ANODE, Pin 3 = REF - making them electrically identical but mechanically incompatible without PCB redesign.
What is the maximum cathode current rating for TL432AIDBVRE4?
The TL432AIDBVRE4 supports a continuous cathode current range of 1 mA to 100 mA, as specified in its Recommended Operating Conditions. Absolute Maximum Ratings allow up to ±150 mA, but sustained operation above 100 mA requires thermal derating based on ambient temperature and PCB copper area, given its RθJA of 206°C/W in the SOT-23-5 package.
Can TL432AIDBVRE4 replace a Zener diode in a linear regulator feedback network?
Yes - the TL432AIDBVRE4 is explicitly designed as a precision Zener diode replacement. With its sharp turn-on characteristic, 0.2 Ω dynamic impedance, and adjustable 2.495–36 V output, it delivers superior stability and lower temperature drift than discrete Zeners. It requires only two external resistors and operates reliably down to 1 mA cathode current.
What is the temperature coefficient specification for TL432AIDBVRE4 over –40°C to +85°C?
The TL432AIDBVRE4 (I-temp grade) exhibits a maximum reference voltage deviation of 14 mV over the full –40°C to +85°C range, as documented in the VI(dev) parameter. This corresponds to an effective temperature coefficient of approximately 92 ppm/°C worst-case, ensuring predictable performance in industrial environments without additional compensation.
TL432AIDBVRE4 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
TL432AIDBVRE4 FAQ
1.How can I place an order for TL432AIDBVRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL432AIDBVRE4 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 TL432AIDBVRE4 reliable?
The price and inventory of TL432AIDBVRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL432AIDBVRE4 is usually 5 days.
3.What payment methods are accepted for TL432AIDBVRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL432AIDBVRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL432AIDBVRE4?
TL432AIDBVRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL432AIDBVRE4 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 TL432AIDBVRE4?
For technical support, including TL432AIDBVRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL432AIDBVRE4 requirements.
6.How does Aetrix verify that TL432AIDBVRE4 is sourced from the original manufacturer or authorized distributors?
All TL432AIDBVRE4 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 TL432AIDBVRE4 meets industry standards.
7.What is the process for return or replacement of TL432AIDBVRE4?
All TL432AIDBVRE4 units undergo pre-shipment inspection (PSI). If there is an issue with TL432AIDBVRE4, 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 TL432AIDBVRE4 part is unused and in its original packaging.
Return procedure for TL432AIDBVRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL432AIDBVRE4 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
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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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