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Texas Instruments TL432BQDBVRE4
- Part No.:
- TL432BQDBVRE4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TL432BQDBVRE4.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,447
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Product details
Overview
TL432BQDBVRE4 from Texas Instruments is a precision programmable shunt voltage reference in SOT-23-5 package, featuring 0.5% initial tolerance at 25°C, 14 mV max reference voltage deviation over −40°C to +125°C, 0.2 Ω typical dynamic impedance, and 1–100 mA sink-current capability. It serves as an adjustable voltage reference or Zener diode replacement in secondary-side regulation of automotive-grade flyback SMPSs.
For engineers reviewing the TL432BQDBVRE4 datasheet, TL432BQDBVRE4 pinout, TL432BQDBVRE4 application, or TL432BQDBVRE4 equivalent, key selection factors include its Q-grade temperature range (−40°C to 125°C), B-grade accuracy, DBV package pinout distinction from TL431, low output impedance for stable feedback loops, and compatibility with two-resistor external programming.
Technical Context
The TL432BQDBVRE4 implements a three-terminal adjustable shunt regulator architecture with an internal error amplifier, reference, and NPN output stage. Its cathode-anode-ref terminal configuration enables precise voltage setting between 2.483 V and 36 V using two external resistors, while maintaining sharp turn-on characteristics ideal for closed-loop regulation.
Unlike the TL431, the TL432 variant uses a different pinout in DBV (SOT-23-5) packages: Pin 1 = ANODE, Pin 2 = NC, Pin 3 = REF, Pin 4 = NC, Pin 5 = CATHODE. This layout isolates the reference input from cathode current paths, reducing noise coupling and improving stability in high-precision feedback networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.483–2.507 V at 25°C (B-grade, ±0.5% tolerance); sets minimum programmable output |
| Temp Range | −40°C to +125°C (Q-grade); qualified for under-hood automotive applications |
| VREF Deviation | ≤14 mV over full temperature range; ensures ≤0.56% output drift in 25 V systems |
| Dynamic Impedance | 0.2 Ω typical; minimizes output voltage variation under load transients |
| Sink Current | 1–100 mA; supports direct drive of optocoupler LEDs in isolated SMPS feedback |
| Reference Input Current | 2–4 µA; enables high-impedance resistor dividers without significant loading error |
| Min Cathode Current | 0.4–0.7 mA; defines lowest stable operating point for regulation onset |
Pinout & Package
SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm body, 0.95 mm max height, gull-wing leads, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | ANODE | Common return node; must be connected to system ground or low-impedance reference plane |
| Pin 2 | NC | No internal connection; left unconnected or tied to ANODE per layout best practice |
| Pin 3 | REF | High-impedance reference input; connects to resistor divider midpoint for voltage sensing |
| Pin 4 | NC | No internal connection; electrically isolated; avoid routing signals here |
| Pin 5 | CATHODE | Current-sink output; delivers regulated shunt current to external load or optocoupler |
Key Features
| Feature | Design Value |
|---|---|
| 0.5% Initial Accuracy (B Grade) | Reduces need for post-production calibration in automotive voltage monitoring circuits |
| −40°C to +125°C Operation (Q Grade) | Enables use in engine control units and ADAS power supplies without derating |
| 0.2 Ω Dynamic Output Impedance | Stabilizes feedback loop gain across line/load transients in 500 kHz+ SMPS designs |
| Low 2–4 µA Reference Current | Permits >1 MΩ resistor dividers, minimizing power loss and thermal drift in precision references |
| Sharp Turn-On Characteristic | Provides clean switching behavior in comparator-with-integrated-reference configurations |
Applications
| Automotive Engine Control Unit (ECU) Reference | Flyback SMPS Secondary-Side Regulation |
|---|---|
Use Scenario: Provides stable 5 V or 3.3 V reference for analog sensor signal conditioning in ECU microcontrollers under wide ambient temperature swings. IC Role / Device Role / Timing Role: Precision shunt reference establishing absolute voltage基准 for ADC reference inputs and op-amp biasing. Use Value: 14 mV max VREF deviation ensures <±0.3% reference error over −40°C to +125°C, meeting ASIL-B functional safety margin requirements. |
Use Scenario: Regulates isolated output voltage in 12 V/5 V dual-output flyback converters used in infotainment power supplies. IC Role / Device Role / Timing Role: Adjustable shunt reference driving optocoupler LED to close feedback loop across isolation barrier. Use Value: 1–100 mA sink capability directly interfaces with PC817/PC817x-series optocouplers without external transistor buffering. |
| Zener Diode Replacement in Industrial PLCs | Voltage Monitoring in Battery Management Systems |
Use Scenario: Replaces discrete 2.5 V Zener diodes in programmable logic controller (PLC) analog I/O modules requiring long-term stability. IC Role / Device Role / Timing Role: Programmable shunt regulator configured as fixed 2.5 V reference via zero-resistor divider. Use Value: 0.2 Ω dynamic impedance yields <1 mV output shift under 10 mA load step-10× better than typical 1N5220B Zener. |
Use Scenario: Monitors individual cell voltage in 12S Li-ion battery packs, triggering fault signals when voltage exceeds 4.25 V threshold. IC Role / Device Role / Timing Role: Comparator with integrated reference, comparing divided cell voltage against internal 2.495 V bandgap. Use Value: 2–4 µA reference current allows high-ratio resistor dividers (e.g., 1 MΩ/100 kΩ), reducing quiescent current below 5 µA per channel. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL432BIDBVRE4 | I-grade (−40°C to +85°C) vs. Q-grade; identical electrical specs except temp range and VI(dev) = 14–34 mV | Not qualified for under-hood automotive use; suitable for industrial control cabinets or consumer power adapters | Select when ambient temperature stays below 85°C and cost sensitivity outweighs extended temp qualification |
| TLVH431BQDBVR | Lower 1.24 V reference voltage; 0.5% tolerance; 1.5 mA max cathode current; Q-grade temp range | Enables lower-voltage feedback loops (e.g., 1.8 V rails); unsuitable for >2.5 V reference needs due to fundamental VREF limit | Choose only when system requires sub-2.5 V reference and can accept reduced sink current capability |
Compared with TL432BQDBVRE4, TL432BIDBVRE4 sacrifices automotive temperature qualification for lower cost, while TLVH431BQDBVR trades higher sink current and 2.5 V reference headroom for lower-voltage operation-neither is pin-compatible, and both require PCB layout revision.
Availability
TL432BQDBVRE4 is available at Aetrix Electronics and suitable for automotive power management, industrial PLC analog I/O, and isolated DC-DC converter design requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TL432BQDBVRE4 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 ICs, with decades of automotive qualification expertise and AEC-Q100-compliant manufacturing.
The TL432 product line delivers precision programmable shunt references optimized for high-reliability feedback control in automotive, industrial, and communications power systems-designed specifically for secondary-side regulation and voltage monitoring where stability and accuracy are critical.
FAQ
What is the exact pinout of TL432BQDBVRE4 in the SOT-23-5 (DBV) package?
The TL432BQDBVRE4 uses a non-standard pinout versus TL431: Pin 1 = ANODE, Pin 2 = NC, Pin 3 = REF, Pin 4 = NC, Pin 5 = CATHODE. This arrangement separates the reference input from cathode current flow, reducing noise coupling and improving stability in sensitive feedback applications. Always verify against TI's SLVS543P datasheet Figure 6 for DBV-package TL432 devices.
How does TL432BQDBVRE4 differ from TL431BQDBVRE4 beyond pinout?
The TL432BQDBVRE4 and TL431BQDBVRE4 share identical electrical specifications-including 0.5% reference tolerance, 14 mV VREF deviation over −40°C to +125°C, and 0.2 Ω dynamic impedance-but differ exclusively in pin assignment for DBV, DBZ, and PK packages. The TL432BQDBVRE4 is not a drop-in replacement for TL431BQDBVRE4; PCB layout must be revised to accommodate the swapped REF and CATHODE positions.
What is the maximum cathode voltage rating for TL432BQDBVRE4?
The TL432BQDBVRE4 has an absolute maximum cathode-to-anode voltage (VK A) rating of 37 V. In normal operation, the recommended cathode voltage range is VREF to 36 V. Exceeding 37 V risks permanent damage; for 42 V automotive systems, external clamping or series limiting is required before the TL432BQDBVRE4 cathode input.
Can TL432BQDBVRE4 operate with less than 1 mA cathode current?
The TL432BQDBVRE4 specifies a minimum cathode current (Imin) of 0.4–0.7 mA for stable regulation. Below this threshold, output voltage may deviate beyond specification or exhibit instability. For ultra-low-power monitoring, use the device only in active regulation mode with ≥0.7 mA sustained cathode current-or select TLVH431 variants if sub-mA operation is mandatory.
Is TL432BQDBVRE4 qualified for automotive applications?
Yes-TL432BQDBVRE4 carries Q-grade qualification (−40°C to +125°C operating range) and is manufactured in TI's AEC-Q100-qualified processes. It meets automotive reliability standards for engine control, body electronics, and ADAS subsystems. The "Q" suffix explicitly denotes automotive temperature grading, and the DBV package is listed in TI's automotive-orderable addendum for TL432 devices.
TL432BQDBVRE4 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:
- ±0.5%
- 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-23-5
TL432BQDBVRE4 FAQ
1.How can I place an order for TL432BQDBVRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL432BQDBVRE4 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 TL432BQDBVRE4 reliable?
The price and inventory of TL432BQDBVRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL432BQDBVRE4 is usually 5 days.
3.What payment methods are accepted for TL432BQDBVRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL432BQDBVRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL432BQDBVRE4?
TL432BQDBVRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL432BQDBVRE4 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 TL432BQDBVRE4?
For technical support, including TL432BQDBVRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL432BQDBVRE4 requirements.
6.How does Aetrix verify that TL432BQDBVRE4 is sourced from the original manufacturer or authorized distributors?
All TL432BQDBVRE4 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 TL432BQDBVRE4 meets industry standards.
7.What is the process for return or replacement of TL432BQDBVRE4?
All TL432BQDBVRE4 units undergo pre-shipment inspection (PSI). If there is an issue with TL432BQDBVRE4, 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 TL432BQDBVRE4 part is unused and in its original packaging.
Return procedure for TL432BQDBVRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL432BQDBVRE4 Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
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LM4040CYM3-2.5-TR
Microchip Technology
-
LM4040CYM3-4.1-TR
Microchip Technology
-
LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
-
LM4040D20IDBZR
Texas Instruments
-
LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
-
LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
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