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Texas Instruments TL432AIDBZTG4
- Part No.:
- TL432AIDBZTG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL432AIDBZTG4.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,522
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Product details
Overview
TL432AIDBZTG4 from Texas Instruments is a precision adjustable shunt voltage reference in SOT-23-3 package, featuring 1% initial tolerance at 25°C, 2.495 V nominal reference voltage, −40°C to 125°C operating temperature range (Q-grade), and 0.2 Ω typical dynamic impedance. It replaces Zener diodes in feedback loops of isolated DC/DC converters and industrial power supplies.
For engineers reviewing the TL432AIDBZTG4 datasheet, TL432AIDBZTG4 pinout, TL432AIDBZTG4 application, or TL432AIDBZTG4 equivalent, key selection criteria include its Q-grade automotive/military temperature rating, SOT-23-3 footprint compatibility with space-constrained designs, 14 mV max reference voltage drift over full temperature range, and sink-current capability up to 100 mA.
Technical Context
The TL432AIDBZTG4 implements a bandgap-based error amplifier with internal 2.495 V reference, configured as a three-terminal shunt regulator where cathode current is controlled by the voltage at the REF pin relative to ANODE. Its sharp turn-on characteristic and low output impedance enable stable regulation in switching power supply feedback paths.
Unlike TL431 variants, TL432AIDBZTG4 uses a distinct pinout (CATHODE–REF–ANODE) optimized for compact PCB layouts in high-density power modules. It supports adjustable output voltages from 2.495 V to 36 V using two external resistors and maintains stability with load capacitance up to 1 µF under specified current conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V nominal; sets precise feedback threshold for power supply regulation loops |
| Initial Tolerance | ±1% at 25°C (A grade); ensures tight output voltage accuracy without trimming |
| Temp Range | −40°C to +125°C (Q grade); qualified for under-hood automotive and industrial control environments |
| Dynamic Impedance | 0.2 Ω typical; minimizes output voltage variation under dynamic load transients |
| Sink Current Range | 1 mA to 100 mA; supports direct interface with optocoupler LEDs in isolated flyback controllers |
| Ref Input Current | 2–4 µA typical; enables high-impedance resistor divider networks without significant loading error |
| Voltage Drift | ≤14 mV over full temperature range; guarantees <0.05% output variation across operating conditions |
Pinout & Package
TL432AIDBZTG4 is housed in a SOT-23-3 surface-mount package (2.90 mm × 1.30 mm) with gull-wing leads. The device uses a non-standard TL432 pinout: Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CATHODE) | Shunt current input | Connects to primary-side feedback node; sinks current proportional to REF–ANODE voltage error |
| 2 (REF) | Reference input | High-impedance threshold input; compares against internal 2.495 V bandgap to control cathode conduction |
| 3 (ANODE) | Common return | Typically tied to system ground or secondary-side common; defines reference potential for REF pin |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | 2.495 V to 36 V via two external resistors; eliminates need for multiple fixed-voltage references |
| Low output noise | Sub-20 µVRMS (0.1–10 Hz); preserves signal integrity in precision analog feedback paths |
| Sharp turn-on characteristic | Fast response to REF voltage deviations; prevents oscillation in closed-loop power supply designs |
| Thermal stability | 14 mV max VREF deviation over −40°C to +125°C; maintains regulation accuracy without external compensation |
| ESD robustness | ±2000 V HBM; withstands handling and board assembly stresses without parameter shift |
Applications
| Industrial AC/DC Power Supplies | Rack Server Power Modules |
|---|---|
Use Scenario: Regulating 12 V and 48 V outputs in DIN-rail mounted AC/DC converters for factory automation systems. IC Role / Device Role / Timing Role: Shunt reference in optocoupler-coupled feedback loop, setting precise output voltage threshold. Use Value: ±1% initial tolerance and 14 mV thermal drift ensure output stays within ±2% over full industrial temperature range. | Use Scenario: Secondary-side voltage sensing in multi-output 48 V intermediate bus converters for data center servers. IC Role / Device Role / Timing Role: Precision shunt reference driving optocoupler LED to isolate feedback signal from primary side. Use Value: 0.2 Ω dynamic impedance minimizes load-induced output variation during CPU power burst transients. |
| AC Inverter Drive Controls | Servo Drive Feedback Circuits |
Use Scenario: Providing stable reference for DC bus voltage monitoring and overvoltage protection in HVAC and pump inverters. IC Role / Device Role / Timing Role: High-accuracy voltage threshold detector interfacing with microcontroller ADC inputs. Use Value: 2–4 µA reference input current enables use of high-value resistor dividers, reducing power loss in always-on monitoring circuits. | Use Scenario: Setting current limit thresholds in motor phase current sensing amplifiers for robotic servo drives. IC Role / Device Role / Timing Role: Adjustable reference source for comparator-based overcurrent detection circuitry. Use Value: −40°C to +125°C operation ensures reliable trip-point accuracy across motor housing temperature extremes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431AQDBZR | Same Q-grade temp range and 1% tolerance, but TL431 pinout (CATHODE–ANODE–REF) in identical SOT-23-3 package | Requires PCB layout revision due to reversed ANODE/REF pin positions; not drop-in compatible | Select when redesigning for TL431 ecosystem compatibility or sourcing continuity |
| TLVH431AQDBVR | Lower 1.24 V reference voltage, 1% tolerance, same Q-grade and SOT-23-3 package | Enables lower-voltage feedback designs (e.g., 3.3 V rails); requires recalculation of resistor divider ratios | Select when system requires sub-2.5 V reference or tighter low-voltage regulation |
Compared with TL431AQDBZR and TLVH431AQDBVR, TL432AIDBZTG4 provides identical thermal and accuracy specs but delivers immediate layout compatibility for TL432-specific designs-critical for minimizing rework in high-volume power module production.
Availability
TL432AIDBZTG4 is available at Aetrix Electronics and suitable for industrial AC/DC power supplies, rack server power modules, and AC inverter drive controls requiring stable component supply across extended temperature ranges.
Supply support for TL432AIDBZTG4 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 and precision analog ICs.
The TL43x family was designed for high-accuracy voltage regulation in isolated power supplies, industrial controls, and safety-critical feedback systems-emphasizing thermal stability, long-term drift immunity, and robust ESD performance.
FAQ
What is the reference voltage tolerance of TL432AIDBZTG4 at 25°C?
The TL432AIDBZTG4 has a ±1% initial reference voltage tolerance at 25°C, corresponding to the "A" grade designation. This means its nominal 2.495 V reference voltage falls between 2.470 V and 2.520 V under standard test conditions (VKA = Vref, IKA = 10 mA). This tolerance is verified per TI's SLVS543S datasheet Section 6.8.
How does the TL432AIDBZTG4 pinout differ from TL431 devices?
The TL432AIDBZTG4 uses a CATHODE–REF–ANODE pinout (Pin 1–2–3) in its SOT-23-3 package, whereas TL431 variants use CATHODE–ANODE–REF. This difference is intentional and documented in TI's Pin Configuration section (Figure 5-1). Using TL431 layout with TL432AIDBZTG4 will result in incorrect biasing and functional failure.
What is the maximum operating temperature range for TL432AIDBZTG4?
The TL432AIDBZTG4 is rated for operation from −40°C to +125°C, indicated by the "Q" suffix in its part number. This Q-grade qualification meets extended temperature requirements for automotive engine compartments, industrial motor drives, and outdoor power infrastructure-verified in Sections 6.7 and 6.13 of the datasheet.
Can TL432AIDBZTG4 replace a Zener diode in feedback circuits?
Yes, TL432AIDBZTG4 is explicitly designed as a precision replacement for Zener diodes in voltage regulation feedback paths. Its 0.2 Ω dynamic impedance, sharp turn-on, and 2.495 V reference provide superior accuracy, stability, and temperature performance compared to discrete Zeners-especially critical in isolated flyback and forward converter topologies.
What is the minimum cathode current required for regulation in TL432AIDBZTG4?
The TL432AIDBZTG4 requires a minimum cathode current of 0.4 mA to maintain regulation, as specified in Section 6.5–6.13 of the datasheet. Below this threshold, the device exits active regulation and behaves as an open circuit. Designers must ensure resistor divider networks and optocoupler LED forward currents collectively sustain ≥0.4 mA cathode sink under all operating conditions.
TL432AIDBZTG4 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:
- Discontinued at Digi-Key
- 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
TL432AIDBZTG4 FAQ
1.How can I place an order for TL432AIDBZTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL432AIDBZTG4 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 TL432AIDBZTG4 reliable?
The price and inventory of TL432AIDBZTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL432AIDBZTG4 is usually 5 days.
3.What payment methods are accepted for TL432AIDBZTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL432AIDBZTG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL432AIDBZTG4?
TL432AIDBZTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL432AIDBZTG4 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 TL432AIDBZTG4?
For technical support, including TL432AIDBZTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL432AIDBZTG4 requirements.
6.How does Aetrix verify that TL432AIDBZTG4 is sourced from the original manufacturer or authorized distributors?
All TL432AIDBZTG4 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 TL432AIDBZTG4 meets industry standards.
7.What is the process for return or replacement of TL432AIDBZTG4?
All TL432AIDBZTG4 units undergo pre-shipment inspection (PSI). If there is an issue with TL432AIDBZTG4, 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 TL432AIDBZTG4 part is unused and in its original packaging.
Return procedure for TL432AIDBZTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL432AIDBZTG4 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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