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Texas Instruments TL432AQDBZR
- Part No.:
- TL432AQDBZR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL432AQDBZR.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,026
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Product details
Overview
TL432AQDBZR from Texas Instruments is a precision programmable shunt voltage reference in SOT-23-3 package, delivering 2.495 V nominal reference voltage with ±1% initial accuracy at 25°C, 14–34 mV total temperature drift over −40°C to +125°C, and 0.2 Ω dynamic impedance - used for feedback regulation in isolated DC/DC converters and industrial power supplies.
For engineers reviewing the TL432AQDBZR datasheet, TL432AQDBZR pinout, TL432AQDBZR application, or TL432AQDBZR equivalent, key selection criteria include automotive-grade temperature range (−40°C to 125°C), A-grade 1% reference tolerance, SOT-23-3 footprint compatibility, and shunt regulator sink-current capability up to 100 mA.
Technical Context
The TL432AQDBZR implements a three-terminal adjustable shunt regulator architecture with an internal error amplifier, reference, and output transistor - operating as a precision voltage-controlled current sink. Its REF pin senses voltage relative to ANODE, enabling programmable output from 2.495 V to 36 V using two external resistors.
Unlike the TL431, the TL432AQDBZR uses a distinct pinout (CATHODE–REF–ANODE) in the SOT-23-3 package, requiring PCB layout revision when replacing TL431 variants. It supports stable operation across −40°C to +125°C with guaranteed thermal stability and low 10 Hz–10 kHz input noise performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V nominal (2.470–2.520 V range), defines regulation setpoint for feedback loops |
| Initial Accuracy | ±1% at 25°C (A grade), enables tight output voltage control without trimming |
| Temp Range | −40°C to +125°C (Q grade), qualified for under-hood automotive and industrial environments |
| Dynamic Impedance | 0.2 Ω typical, ensures minimal output voltage shift under load transients |
| Sink Current Range | 1 mA to 100 mA, supports direct interface with optocoupler LEDs in isolated SMPS |
| Ref Input Current | 2–4 µA, allows high-value feedback resistors to minimize power loss |
| Temp Drift (VI(dev)) | 14–34 mV over full range, translates to ~100 ppm/°C max effective TC |
Pinout & Package
SOT-23-3 package (2.90 mm × 1.30 mm), surface-mount, lead-free, RoHS-compliant. Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE (Pin 1) | Shunt current/voltage input | Primary current path into device; connects to switched node or optocoupler cathode in feedback loop |
| REF (Pin 2) | Threshold sensing input | High-impedance reference comparator input; sets regulation point via resistor divider to ANODE |
| ANODE (Pin 3) | Common return node | Typically tied to system ground or power supply return; serves as voltage reference for REF pin |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | Programmable from 2.495 V to 36 V using two external resistors - eliminates need for multiple fixed references |
| Low output impedance | 0.2 Ω typical dynamic impedance ensures stable regulation under fast load steps in SMPS feedback paths |
| Automotive temperature grade | Qualified for −40°C to +125°C operation (Q grade), suitable for engine control and ADAS power modules |
| Low reference input current | 2–4 µA max enables >1 MΩ feedback dividers, reducing standby power in always-on systems |
| Sharp turn-on characteristic | Active output circuitry provides fast, clean regulation onset - improves transient response vs. Zener diodes |
Applications
| Rack Server Power Supply | Industrial AC/DC Converter |
|---|---|
Use Scenario: Secondary-side voltage feedback in isolated 48 V–12 V DC/DC modules for telecom servers. IC Role / Device Role / Timing Role: Shunt reference providing precise error signal to optocoupler-driven PWM controller. Use Value: ±1% initial accuracy and 14–34 mV temp drift ensure <±1.5% output voltage variation across full thermal range. | Use Scenario: Output voltage regulation in DIN-rail mounted 24 V AC/DC power supplies for PLCs. IC Role / Device Role / Timing Role: Adjustable shunt regulator setting feedback threshold for UC384x-based flyback controller. Use Value: 0.2 Ω dynamic impedance maintains regulation stability during motor startup surges and line transients. |
| AC Inverter Drive | Servo Drive Control Module |
Use Scenario: DC bus voltage monitoring and overvoltage protection reference in 3-phase IGBT gate driver power rails. IC Role / Device Role / Timing Role: Precision voltage threshold generator for comparator-based fault detection circuitry. Use Value: −40°C to +125°C rating ensures reliable trip-point accuracy in high-temperature inverter enclosures. | Use Scenario: Isolated auxiliary supply regulation for position encoder interface and analog sensor biasing. IC Role / Device Role / Timing Role: Programmable shunt reference establishing stable 5 V or 3.3 V rail from unregulated winding. Use Value: SOT-23-3 footprint enables compact placement near isolated transformer secondary, minimizing noise pickup. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431AQDBZR | Different pinout (CATHODE–ANODE–REF); same electrical specs, grade, and temp range | Requires PCB layout change due to swapped ANODE/REF pins; not drop-in compatible | Select only if redesigning board to match TL431 footprint or leveraging existing TL431 layout |
| TLVH431AQDBVR | Lower 1.24 V reference, 1% accuracy, same Q-temp grade and SOT-23-3 package | Better suited for low-voltage regulation (e.g., 1.8 V, 2.5 V rails); higher ref current (100 nA typ) | Choose when system requires sub-2.4 V reference or tighter low-voltage tolerance |
Compared with TL431AQDBZR and TLVH431AQDBVR, TL432AQDBZR offers identical A-grade accuracy and Q-temp qualification but uniquely supports the CATHODE–REF–ANODE pinout - critical for legacy TL432-compatible designs and space-constrained layouts where REF-to-ANODE routing must be minimized.
Availability
TL432AQDBZR 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 TL432AQDBZR 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 and embedded processing technologies, with leadership in power management, signal chain, and high-reliability components.
The TL43x family - including TL432AQDBZR - was designed for precision voltage regulation in isolated power supplies, industrial controls, and automotive systems demanding robust thermal performance and long-term stability.
FAQ
What is the reference voltage tolerance of TL432AQDBZR at 25°C?
The TL432AQDBZR has a reference voltage tolerance of ±1% at 25°C (A grade), corresponding to a 2.470 V to 2.520 V range around the nominal 2.495 V output. This tolerance is specified per TI's SLVS543S datasheet Section 6.10 and applies strictly under recommended operating conditions with 10 mA cathode current. The TL432AQDBZR maintains this accuracy without external calibration.
How does TL432AQDBZR differ from TL431AQDBZR in pin configuration?
The TL432AQDBZR uses CATHODE–REF–ANODE pinout (Pin 1–2–3) in the SOT-23-3 package, whereas TL431AQDBZR uses CATHODE–ANODE–REF. This difference means TL432AQDBZR is not pin-compatible with TL431AQDBZR - swapping them requires PCB trace revision. Both share identical electrical specifications, A-grade accuracy, and Q-temp qualification.
What is the maximum operating temperature range for TL432AQDBZR?
The TL432AQDBZR is rated for operation from −40°C to +125°C (Q grade), as confirmed in Section 4 (Device Comparison Table) and Section 6.7 of the TI SLVS543S datasheet. This extended range supports use in automotive under-hood applications, industrial motor drives, and outdoor power equipment where ambient temperatures exceed commercial-grade limits.
Can TL432AQDBZR replace a Zener diode in feedback circuits?
Yes, TL432AQDBZR is explicitly designed as a precision replacement for Zener diodes in voltage regulation and feedback applications. Its active circuitry delivers sharp turn-on, low dynamic impedance (0.2 Ω), and stable 2.495 V reference - outperforming typical Zeners in accuracy, temperature drift, and noise. TI's datasheet Section 3 confirms its use in on-board regulation and switching power supplies.
What is the minimum cathode current required for regulation in TL432AQDBZR?
The TL432AQDBZR requires a minimum cathode current of 0.4 mA to maintain regulation, per Section 6.10 of the TI SLVS543S datasheet. This value is valid across the full −40°C to +125°C temperature range and ensures stable operation even at light loads - critical for energy-efficient standby modes in industrial power supplies.
TL432AQDBZR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- 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-23-3
TL432AQDBZR FAQ
1.How can I place an order for TL432AQDBZR through Aetrix?
Please submit a Request for Quotation (RFQ) for TL432AQDBZR 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 TL432AQDBZR reliable?
The price and inventory of TL432AQDBZR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL432AQDBZR is usually 5 days.
3.What payment methods are accepted for TL432AQDBZR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL432AQDBZR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL432AQDBZR?
TL432AQDBZR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL432AQDBZR 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 TL432AQDBZR?
For technical support, including TL432AQDBZR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL432AQDBZR requirements.
6.How does Aetrix verify that TL432AQDBZR is sourced from the original manufacturer or authorized distributors?
All TL432AQDBZR 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 TL432AQDBZR meets industry standards.
7.What is the process for return or replacement of TL432AQDBZR?
All TL432AQDBZR units undergo pre-shipment inspection (PSI). If there is an issue with TL432AQDBZR, 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 TL432AQDBZR part is unused and in its original packaging.
Return procedure for TL432AQDBZR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL432AQDBZR 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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