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Texas Instruments TL432QDBVR
- Part No.:
- TL432QDBVR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TL432QDBVR.pdf
- Description:
- IC VREF SHUNT ADJ 2.2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,882
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Product details
Overview
TL432QDBVR from Texas Instruments is a precision programmable shunt voltage reference in SOT-23-3 package, featuring 2.495 V nominal reference voltage (±0.5% initial tolerance), −40°C to +125°C operating temperature range, 0.2 Ω typical dynamic impedance, and 1 mA to 100 mA sink-current capability. It serves as an adjustable voltage reference or Zener diode replacement in automotive-grade secondary-side regulation circuits.
For engineers reviewing the TL432QDBVR datasheet, TL432QDBVR pinout, TL432QDBVR application, or TL432QDBVR equivalent, key selection considerations include its Q-grade automotive temperature rating, SOT-23-3 pinout (CATHODE–REF–ANODE), low VI(dev) of 14 mV over full temperature range, and compatibility with flyback SMPS feedback loops requiring stable 2.5 V reference accuracy under thermal stress.
Technical Context
The TL432QDBVR implements a three-terminal adjustable shunt regulator architecture with an internal error amplifier, reference, and output transistor. Its REF pin senses voltage relative to ANODE, triggering cathode current conduction when input exceeds Vref - enabling precise voltage regulation via external resistor divider.
Unlike the TL431, the TL432QDBVR uses reversed pinout (Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE) in SOT-23-3, and is qualified per AEC-Q100 for automotive applications. It delivers 14 mV max reference voltage deviation (VI(dev)) across −40°C to +125°C and maintains 0.2 Ω dynamic impedance at 1–100 mA cathode current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V ±0.5% at 25°C - enables accurate 2.5 V setpoint generation for feedback networks |
| Temp Range | −40°C to +125°C - qualified for under-hood automotive power supply monitoring and regulation |
| VI(dev) | 14 mV max over full temperature range - ensures ≤0.56% reference drift in worst-case thermal conditions |
| Dynamic Impedance | 0.2 Ω typical - minimizes output voltage perturbation during load transients in closed-loop systems |
| Cathode Current | 1 mA to 100 mA sink capability - supports direct interface with optocoupler LEDs in isolated SMPS designs |
| Output Noise | Low - enables stable regulation without added filtering in noise-sensitive analog sensing paths |
| Package | SOT-23-3 (2.90 mm × 1.30 mm) - surface-mount footprint compatible with high-density PCB layouts |
Pinout & Package
SOT-23-3 package with 2.90 mm × 1.30 mm body size and standard gull-wing leads. Thermal resistance RθJA = 206°C/W; maximum power dissipation limited to ~360 mW at TA = 125°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (CATHODE) | Shunt current output node | Connects to feedback node or optocoupler anode; sinks regulated current to maintain VREF at divider junction |
| Pin 2 (REF) | Reference input threshold | Senses voltage relative to ANODE; conduction initiates when VREF ≥ 2.495 V ±0.5% |
| Pin 3 (ANODE) | Common reference return | Typically tied to system ground or power rail return; defines reference potential for REF pin |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 1 (−40°C to +125°C) - validated for engine control, ADAS, and body electronics |
| Sharp turn-on characteristic | Active output circuitry enables fast response to reference threshold crossing - improves transient regulation in SMPS |
| Zener replacement capability | Replaces discrete Zener diodes with superior stability, lower tempco, and tighter initial tolerance |
| Low reference current | Iref = 2–4 µA - reduces divider network loading and power loss in high-impedance feedback paths |
| Stable operation with capacitive loads | Designed for robust performance with up to 1 nF capacitance on cathode - simplifies layout in noisy environments |
Applications
| Secondary-Side Regulation | Zener Diode Replacement |
|---|---|
|
Use Scenario: Feedback path in isolated flyback converter for automotive infotainment power supply. IC Role / Device Role / Timing Role: Adjustable shunt reference providing precise 2.5 V threshold to drive optocoupler LED current. Use Value: Enables ±1% output voltage regulation across temperature and line variations without secondary-side controller IC. |
Use Scenario: Overvoltage protection clamp in 12 V battery-sensed microcontroller reset circuit. IC Role / Device Role / Timing Role: Precision voltage threshold detector replacing 2.5 V Zener with tighter tolerance and lower tempco. Use Value: Reduces false resets by limiting reference drift to 14 mV over −40°C to +125°C versus >50 mV for standard Zeners. |
| Voltage Monitoring | Comparator with Integrated Reference |
|
Use Scenario: Real-time 48 V bus undervoltage lockout in electric power steering ECU. IC Role / Device Role / Timing Role: Programmable reference input to comparator detecting <42 V condition. Use Value: Delivers stable trip point independent of supply ripple due to low dynamic impedance (0.2 Ω). |
Use Scenario: Window comparator for battery cell voltage validation in BMS front-end. IC Role / Device Role / Timing Role: Dual TL432QDBVR units provide high-accuracy upper/lower thresholds (e.g., 3.0 V / 2.8 V). Use Value: Eliminates need for external precision references - reduces BOM count and layout area in space-constrained modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431QDBVR | Same Q-grade temp range and SOT-23-3 package, but TL431 pinout (REF–CATHODE–ANODE) | Requires PCB layout revision due to reversed pin assignment; identical electrical specs otherwise | Select TL431QDBVR only if legacy design uses TL431-compatible footprint and no re-spin is possible |
| TL432BQDBVR | 0.5% initial tolerance (B grade) vs. TL432QDBVR's standard 2% grade; same Q-temp rating and pinout | Better accuracy for high-precision feedback loops where ±0.5% Vref stability is required | Choose TL432BQDBVR when tighter reference tolerance directly impacts system-level output regulation spec |
Compared with TL431QDBVR, TL432QDBVR avoids board redesign by preserving TL432-specific pinout while delivering identical automotive qualification; versus TL432BQDBVR, it trades 0.5% accuracy for cost-sensitive applications where 2% initial tolerance meets system requirements.
Availability
TL432QDBVR is available at Aetrix Electronics and suitable for automotive power management, industrial SMPS feedback, and battery monitoring systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TL432QDBVR 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 technologies, with decades of experience in precision reference design.
The TL43x family was developed to deliver cost-effective, high-stability shunt references for automotive, industrial, and consumer power systems - emphasizing thermal robustness, low drift, and drop-in Zener replacement capability.
FAQ
What is the pin configuration of TL432QDBVR?
The TL432QDBVR uses SOT-23-3 package with Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE. This differs from TL431's pinout (REF–CATHODE–ANODE) and must be verified in layout to prevent functional failure. The ANODE pin serves as the reference ground node, and REF senses voltage relative to it.
Does TL432QDBVR meet automotive qualification standards?
Yes, TL432QDBVR is AEC-Q100 qualified for Grade 1 operation (−40°C to +125°C ambient), with tested VI(dev) ≤14 mV over that range and validated reliability for automotive powertrain and body electronics applications. Its Q-suffix explicitly denotes this qualification level.
How does TL432QDBVR differ from TL431QDBVR?
TL432QDBVR and TL431QDBVR share identical electrical specifications and Q-grade temperature rating, but TL432QDBVR uses reversed SOT-23-3 pinout (CATHODE–REF–ANODE). Using TL431QDBVR in a TL432QDBVR layout will cause incorrect biasing and functional failure.
What is the minimum cathode current needed for regulation in TL432QDBVR?
The TL432QDBVR requires ≥0.4 mA cathode current (Imin) to maintain regulation. Below this threshold, output voltage deviates from Vref; design must ensure continuous IKA ≥0.4 mA under all operating conditions, including light-load SMPS modes.
Can TL432QDBVR replace a Zener diode in existing designs?
Yes, TL432QDBVR is explicitly designed as a Zener diode replacement, offering superior initial accuracy (±0.5% vs. ±5%), lower temperature drift (14 mV vs. >50 mV), and sharp turn-on. External resistor divider sets output voltage from 2.495 V to 36 V, matching Zener flexibility with higher precision.
TL432QDBVR 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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
TL432QDBVR FAQ
1.How can I place an order for TL432QDBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for TL432QDBVR 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 TL432QDBVR reliable?
The price and inventory of TL432QDBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL432QDBVR is usually 5 days.
3.What payment methods are accepted for TL432QDBVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL432QDBVR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL432QDBVR?
TL432QDBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL432QDBVR 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 TL432QDBVR?
For technical support, including TL432QDBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL432QDBVR requirements.
6.How does Aetrix verify that TL432QDBVR is sourced from the original manufacturer or authorized distributors?
All TL432QDBVR 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 TL432QDBVR meets industry standards.
7.What is the process for return or replacement of TL432QDBVR?
All TL432QDBVR units undergo pre-shipment inspection (PSI). If there is an issue with TL432QDBVR, 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 TL432QDBVR part is unused and in its original packaging.
Return procedure for TL432QDBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL432QDBVR Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
-
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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