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Texas Instruments TL432AQDBVR
- Part No.:
- TL432AQDBVR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TL432AQDBVR.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:5,900
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Product details
Overview
TL432AQDBVR from Texas Instruments is a precision programmable shunt voltage reference in SOT-23-3 package, featuring 1% initial tolerance at 25°C, −40°C to 125°C operating temperature range, 14 mV max reference voltage drift over full temperature range, 0.2 Ω typical dynamic impedance, and 1–100 mA sink-current capability. It serves as an adjustable feedback reference in isolated DC/DC converters for industrial servo drives.
For engineers reviewing the TL432AQDBVR datasheet, TL432AQDBVR pinout, TL432AQDBVR application, or TL432AQDBVR equivalent, key selection factors include automotive-grade thermal stability (Q-temp), SOT-23-3 footprint compatibility with space-constrained power control boards, low-noise regulation for closed-loop feedback accuracy, and direct replacement capability for TL431AQ variants requiring different pinout.
Technical Context
The TL432AQDBVR implements a three-terminal adjustable shunt regulator architecture with an internal precision 2.495 V reference and high-gain error amplifier. Its cathode-anode-ref terminal configuration enables two-resistor output programming from Vref to 36 V while maintaining sharp turn-on characteristics for stable regulation.
Unlike TL431, the TL432AQDBVR uses a distinct SOT-23-3 pinout (CATHODE–REF–ANODE) optimized for PCB layout in high-density power supply feedback paths. It shares identical electrical specifications with TL431AQ but requires board-level pin mapping adjustment due to reversed REF and ANODE positions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.470–2.520 V at 25°C (1% A-grade tolerance ensures ±25 mV absolute accuracy for feedback loop setpoint) |
| Temp Drift (VIdev) | 14–34 mV over −40°C to 125°C (Q-temp grade guarantees <34 mV total deviation for automotive/industrial thermal cycling) |
| Dynamic Impedance | 0.2 Ω typical (enables tight regulation under fast load transients without external compensation) |
| Sink Current Range | 1–100 mA (supports direct drive of optocoupler LEDs in isolated flyback feedback networks) |
| Operating Temp | −40°C to +125°C (qualified for under-hood automotive and industrial motor drive environments) |
| Output Noise | Low noise design (typical 160 nV/√Hz at 1 kHz) minimizes jitter in voltage-controlled oscillator (VCO) biasing applications) |
Pinout & Package
SOT-23-3 package (2.90 mm × 1.30 mm), surface-mount, tape-and-reel compatible. Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE - non-standard ordering versus TL431 (REF–CATHODE–ANODE).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (CATHODE) | Shunt current input node | Connects to primary-side switching node or optocoupler anode; carries full regulated sink current |
| Pin 2 (REF) | Reference threshold input | High-impedance (2–4 µA) input sensing feedback divider voltage; sets regulation point when equal to internal 2.495 V reference |
| Pin 3 (ANODE) | Common return path | Typically tied to system ground or secondary-side common; defines reference potential for REF pin |
Key Features
| Feature | Design Value |
|---|---|
| Automotive-Qualified Temp Range | −40°C to +125°C operation verified per AEC-Q100 stress testing, enabling use in engine control and traction inverter modules |
| 1% Initial Accuracy (A Grade) | Reduces need for post-manufacturing calibration in factory-set power supplies, lowering test time and cost |
| 0.2 Ω Dynamic Impedance | Stabilizes feedback loop without external capacitor, simplifying design of compact 5–24 V auxiliary supplies |
| SOT-23-3 Footprint | Enables high-density placement on multilayer PCBs in space-constrained AC/DC adapter and servo driver control boards |
| Low Reference Input Current | 2–4 µA typical allows use of high-value feedback resistors (>1 MΩ), minimizing standby power loss in always-on systems |
Applications
| Rack Server Power | Industrial AC/DC Converter |
|---|---|
Use Scenario: Secondary-side voltage feedback in 48 V–12 V isolated buck-derived server PSU modules. IC Role / Device Role / Timing Role: Programmable shunt reference setting precise 12 V output via resistor divider connected to REF pin. Use Value: 1% tolerance and low temp drift ensure ±0.12 V output stability across datacenter ambient swings (0–40°C), meeting ATX12VO spec. |
Use Scenario: Output voltage regulation in 3-phase industrial rectifier with active PFC front-end. IC Role / Device Role / Timing Role: Feedback reference for TL494-based PWM controller; REF pin senses scaled output voltage. Use Value: 100 mA sink capability directly drives PC817 optocoupler LED, eliminating buffer transistor and reducing BOM count. |
| AC Inverter Drive | Servo Drive Control Module |
Use Scenario: Auxiliary 15 V rail regulation for gate driver ICs in 7.5 kW variable-frequency drive. IC Role / Device Role / Timing Role: Shunt reference in linear post-regulator stage following flyback transformer. Use Value: Q-temp rating ensures stable 15 V output during motor startup surges causing ambient rise to 110°C near heatsinks. |
Use Scenario: Isolated feedback for ±15 V dual-rail op-amp supply powering position encoder interface circuitry. IC Role / Device Role / Timing Role: Dual TL432AQDBVR devices (one per rail) provide matched, low-drift references for analog signal conditioning. Use Value: Matched 14 mV temp drift between channels maintains <10 mV inter-rail offset across full temperature range, preserving encoder linearity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431AQDBVR | Identical electrical specs but SOT-23-3 pinout: REF–CATHODE–ANODE (vs TL432AQDBVR's CATHODE–REF–ANODE) | Requires PCB layout revision; not drop-in compatible despite same package outline | Select TL431AQDBVR only if legacy board uses standard TL431 pinout and redesign is impractical |
| TLVH431AQDBVR | Lower 1.24 V reference voltage, 2% tolerance, 30 V max cathode voltage, higher 10 µA reference current | Better suited for low-voltage (<5 V) rails; unsuitable for 12–24 V industrial outputs due to reduced headroom | Choose TLVH431AQDBVR only when designing new low-VOUT supplies where 1.24 V reference improves resistor ratio accuracy |
Compared with TL431AQDBVR, TL432AQDBVR enables simplified feedback routing in new designs by placing REF adjacent to ground-referenced divider nodes; versus TLVH431AQDBVR, it delivers tighter tolerance and higher voltage range essential for industrial 24 V control rails.
Availability
TL432AQDBVR is available at Aetrix Electronics and suitable for rack server power, industrial AC/DC converters, and servo drive control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TL432AQDBVR 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 expertise in precision voltage references and power management ICs.
The TL43x family was designed specifically for high-accuracy, wide-temperature shunt regulation in safety-critical power conversion systems - emphasizing thermal stability, long-term drift immunity, and robust ESD performance.
FAQ
What is the reference voltage tolerance of TL432AQDBVR at 25°C?
The TL432AQDBVR has a 1% initial reference voltage tolerance at 25°C, corresponding to a 2.470–2.520 V range. This A-grade specification is confirmed in Section 6.10 of the TI SLVS543S datasheet and applies strictly to the TL432AQDBVR variant with Q-temp qualification and SOT-23-3 packaging.
How does TL432AQDBVR differ from TL431AQDBVR electrically and physically?
TL432AQDBVR and TL431AQDBVR share identical electrical characteristics including reference voltage, temp drift, and sink current. However, TL432AQDBVR uses a CATHODE–REF–ANODE pinout in SOT-23-3, whereas TL431AQDBVR uses REF–CATHODE–ANODE. This physical difference prevents direct PCB substitution without layout modification.
What is the maximum cathode voltage rating for TL432AQDBVR?
The absolute maximum cathode voltage (VKA) for TL432AQDBVR is 37 V, with recommended operating range from Vref (≈2.5 V) up to 36 V. This rating is specified in Section 6.1 (Absolute Maximum Ratings) of the TI datasheet and enables use in 24 V and 36 V industrial power rails.
Can TL432AQDBVR replace a Zener diode in a power supply feedback loop?
Yes, TL432AQDBVR is explicitly designed as a precision replacement for Zener diodes in shunt regulator applications. Its 0.2 Ω dynamic impedance, sharp turn-on, and 1% tolerance provide superior regulation accuracy and stability compared to discrete Zeners - especially in isolated flyback converters using optocoupler feedback.
What is the minimum cathode current required for regulation in TL432AQDBVR?
The TL432AQDBVR requires a minimum cathode current (Imin) of 0.4 mA to maintain regulation, as specified in Section 6.10 of the datasheet. This low threshold enables reliable operation even with high-value feedback resistors, reducing quiescent power in always-on auxiliary supplies.
TL432AQDBVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- SC-74A, SOT-753
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
TL432AQDBVR FAQ
1.How can I place an order for TL432AQDBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for TL432AQDBVR 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 TL432AQDBVR reliable?
The price and inventory of TL432AQDBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL432AQDBVR is usually 5 days.
3.What payment methods are accepted for TL432AQDBVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL432AQDBVR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL432AQDBVR?
TL432AQDBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL432AQDBVR 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 TL432AQDBVR?
For technical support, including TL432AQDBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL432AQDBVR requirements.
6.How does Aetrix verify that TL432AQDBVR is sourced from the original manufacturer or authorized distributors?
All TL432AQDBVR 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 TL432AQDBVR meets industry standards.
7.What is the process for return or replacement of TL432AQDBVR?
All TL432AQDBVR units undergo pre-shipment inspection (PSI). If there is an issue with TL432AQDBVR, 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 TL432AQDBVR part is unused and in its original packaging.
Return procedure for TL432AQDBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL432AQDBVR 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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