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Texas Instruments TL432BQDBVT
- Part No.:
- TL432BQDBVT
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TL432BQDBVT.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,779
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Product details
Overview
TL432BQDBVT from Texas Instruments is a precision programmable shunt voltage reference in SOT-23-5 package, delivering 2.483–2.507 V reference voltage (0.5% initial tolerance at 25°C), 14–34 mV full-temperature-range deviation (−40°C to 125°C), and 0.2 Ω typical dynamic impedance. It operates as an adjustable shunt regulator in secondary-side feedback loops of automotive-grade flyback SMPSs.
For engineers reviewing the TL432BQDBVT datasheet, TL432BQDBVT pinout, TL432BQDBVT application, or TL432BQDBVT equivalent, this page delivers verified electrical specs, validated pin functions, confirmed Q-temp automotive qualification, and two rigorously cross-checked alternative parts for voltage reference design-in.
Technical Context
The TL432BQDBVT implements a three-terminal adjustable shunt regulator architecture with internal error amplifier, reference, and output transistor. Its cathode-anode-ref terminal configuration enables precise voltage setting between 2.5 V and 36 V using two external resistors, while maintaining sharp turn-on behavior ideal for Zener replacement.
It features a 2–4 µA reference input current, 0.4–0.7 mA minimum regulation current, and −40°C to 125°C operation per AEC-Q100 Grade 1 requirements. The device exhibits low 0.2 Ω dynamic impedance and −1.4 to −2.7 mV/V cathode voltage sensitivity-critical for stable closed-loop feedback in isolated power supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage (25°C) | 2.483–2.507 V - Enables ±0.5% output accuracy in regulated power supplies |
| Temp Range | −40°C to +125°C - Qualified for under-hood automotive applications |
| Dynamic Impedance | 0.2 Ω typical - Ensures minimal output voltage perturbation under load transients |
| Cathode Current Range | 1–100 mA - Supports direct sinking of feedback optocoupler LED current |
| Reference Input Current | 2–4 µA - Allows high-value resistor dividers to minimize quiescent power loss |
| Full-Range Vref Deviation | 14–34 mV - Guarantees ≤1.3% total voltage error over full temperature range |
| Min Regulation Current | 0.4–0.7 mA - Enables stable operation even with light-load or no-load conditions |
Pinout & Package
SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm body, 0.95 mm max height, gull-wing leads, RoHS-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No internal connection | Must be left unconnected; no routing or grounding required |
| 2 (ANODE) | Common reference node | Typically tied to system ground or return path; defines voltage reference point |
| 3 (NC) | No internal connection | Must be left unconnected; electrically isolated from die |
| 4 (REF) | Reference input | Compares external divider voltage against internal 2.5 V bandgap; controls conduction |
| 5 (CATHODE) | Shunt current output | Sinks adjustable current to stabilize output voltage; connects to optocoupler LED anode in SMPS feedback |
Key Features
| Feature | Design Value |
|---|---|
| 0.5% initial voltage tolerance (B grade) | Reduces need for post-production trimming in precision voltage monitoring circuits |
| Automotive temperature range (−40°C to 125°C) | Validates use in engine control units, ADAS power rails, and infotainment DC/DC converters |
| 0.2 Ω dynamic output impedance | Maintains <10 mV output shift during 50 mA load steps-critical for tight-regulation SMPS designs |
| 2–4 µA reference input current | Permits 1 MΩ+ feedback dividers, cutting standby power by >50% vs. standard TL431 variants |
| Sharp turn-on characteristic | Enables clean switching in comparator-with-integrated-reference configurations without hysteresis circuitry |
Applications
| Secondary-Side Flyback Regulation | Zener Diode Replacement |
|---|---|
Use Scenario: Isolated DC/DC converter feedback loop where primary-side controller receives optocoupler signal from secondary winding. IC Role / Device Role / Timing Role: Shunt regulator providing precise voltage reference to drive optocoupler LED; sets output voltage via R1/R2 divider. Use Value: Replaces discrete Zener + transistor with single IC, improving temperature stability and reducing BOM count by 2 components. |
Use Scenario: On-board 3.3 V or 5 V rail stabilization in space-constrained automotive modules. IC Role / Device Role / Timing Role: Adjustable shunt element replacing fixed-voltage Zener diodes with tighter tolerance and lower drift. Use Value: Delivers 0.5% accuracy and 14 mV max drift over −40°C to 125°C-outperforming most 5% Zeners by >3× in thermal stability. |
| Voltage Monitoring Circuit | Comparator with Integrated Reference |
Use Scenario: Battery pack overvoltage detection in 12 V automotive systems with microcontroller supervision. IC Role / Device Role / Timing Role: Precision reference input to external comparator; triggers fault flag when sensed voltage exceeds threshold. Use Value: Eliminates external reference IC, reducing component count and PCB area while maintaining ±1% total monitoring accuracy. |
Use Scenario: Threshold-detection circuit for analog sensor signals in engine coolant temperature or pressure sensing. IC Role / Device Role / Timing Role: Provides stable 2.5 V reference to comparator's inverting input; non-inverting input receives sensor voltage. Use Value: Integrates reference and active shunt into one device-no external bias network needed, simplifying layout and improving noise immunity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL432BIDBVR | Same pinout and electrical specs, but rated for −40°C to 85°C (I-temp), not Q-temp | Suitable for industrial or consumer power supplies-not qualified for automotive under-hood use | Select when cost sensitivity outweighs extended temperature requirement and AEC-Q100 compliance is unnecessary |
| TLVH431BQDBVR | Lower 1.24 V reference, 0.5% tolerance, same Q-temp rating, but higher 10 µA Iref and 0.5 Ω impedance | Better for low-voltage (<3 V) rails; less suitable for 5–12 V SMPS feedback due to higher Iref and impedance | Choose only when system requires sub-2.5 V reference and can accommodate increased quiescent current and reduced dynamic performance |
Compared with TL432BQDBVT, TL432BIDBVR sacrifices automotive temperature range for lower cost, while TLVH431BQDBVR trades reference voltage and dynamic impedance for ultra-low-voltage capability-neither offers drop-in replacement without circuit revalidation.
Availability
TL432BQDBVT is available at Aetrix Electronics and suitable for automotive power conversion, industrial voltage monitoring, and embedded system reference applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TL432BQDBVT 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, embedded processing, and power management technologies, with leadership in automotive, industrial, and communications markets.
The TL43x family was designed as precision programmable shunt references for feedback regulation in isolated power supplies and voltage-sensing applications-emphasizing accuracy, thermal stability, and robustness in harsh environments.
FAQ
What is the exact reference voltage tolerance of TL432BQDBVT at 25°C?
The TL432BQDBVT has a reference voltage tolerance of ±0.5% at 25°C, corresponding to a guaranteed range of 2.483 V to 2.507 V when tested at IKA = 10 mA and VKA = Vref. This B-grade specification is explicitly defined in Section 7.13 of the SLVS543P datasheet for TL431BQ/TL432BQ devices.
Does TL432BQDBVT support automotive temperature requirements?
Yes, TL432BQDBVT is qualified for −40°C to +125°C operation (Q-temp grade) and meets AEC-Q100 stress test requirements for automotive applications. Its full-temperature Vref deviation is specified as 14–34 mV, making it suitable for under-hood power management and ADAS subsystems.
What is the pin configuration of TL432BQDBVT in the SOT-23-5 package?
TL432BQDBVT uses Pin 1 (NC), Pin 2 (ANODE), Pin 3 (NC), Pin 4 (REF), and Pin 5 (CATHODE) in the DBV package. This differs from TL431 variants and is confirmed in the "Pin Configuration and Functions" section (page 6) and Device Comparison Table (page 5) of the official datasheet.
Can TL432BQDBVT replace a standard Zener diode directly?
Yes, TL432BQDBVT serves as a precision Zener replacement with superior performance: it provides adjustable 2.5–36 V output via two resistors, achieves 0.5% initial accuracy versus typical 5% Zener tolerance, and maintains stability over temperature with only 14–34 mV drift-enabling higher system accuracy without additional compensation.
What is the minimum cathode current required for regulation in TL432BQDBVT?
The TL432BQDBVT requires a minimum cathode current of 0.4–0.7 mA to maintain regulation, as specified in Sections 7.11–7.13 of the datasheet. This ensures stable operation even in low-power or no-load SMPS conditions where feedback current is minimal.
TL432BQDBVT 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
TL432BQDBVT FAQ
1.How can I place an order for TL432BQDBVT through Aetrix?
Please submit a Request for Quotation (RFQ) for TL432BQDBVT 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 TL432BQDBVT reliable?
The price and inventory of TL432BQDBVT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL432BQDBVT is usually 5 days.
3.What payment methods are accepted for TL432BQDBVT?
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4.How is shipping managed for TL432BQDBVT?
TL432BQDBVT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL432BQDBVT 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 TL432BQDBVT?
For technical support, including TL432BQDBVT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL432BQDBVT requirements.
6.How does Aetrix verify that TL432BQDBVT is sourced from the original manufacturer or authorized distributors?
All TL432BQDBVT 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 TL432BQDBVT meets industry standards.
7.What is the process for return or replacement of TL432BQDBVT?
All TL432BQDBVT units undergo pre-shipment inspection (PSI). If there is an issue with TL432BQDBVT, 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 TL432BQDBVT part is unused and in its original packaging.
Return procedure for TL432BQDBVT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL432BQDBVT 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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