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Texas Instruments TL432ACDBZT
- Part No.:
- TL432ACDBZT
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL432ACDBZT.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,845
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Product details
Overview
TL432ACDBZT from Texas Instruments is a precision programmable shunt voltage reference in SOT-23-3 package, delivering 2.495 V nominal reference voltage with ±0.5% initial tolerance at 25°C, 1 mA–100 mA sink-current capability, and operation across −40°C to 85°C. It replaces Zener diodes in feedback loops of isolated DC/DC converters, AC/DC adapters, and industrial servo drive power stages.
For engineers reviewing the TL432ACDBZT datasheet, TL432ACDBZT pinout, TL432ACDBZT application, or TL432ACDBZT equivalent, key selection criteria include its A-grade accuracy, SOT-23-3 thermal resistance (206°C/W), low 0.2 Ω dynamic impedance, and distinct TL432 pinout versus TL431 - critical for PCB layout and stability in high-frequency switching supplies.
Technical Context
The TL432ACDBZT implements a three-terminal adjustable shunt regulator architecture with an internal error amplifier, reference, and output transistor. Its REF–ANODE–CATHODE pinout (Pin 1=REF, Pin 2=CATHODE, Pin 3=ANODE) differs from TL431, requiring explicit routing verification in feedback networks.
It operates as a precision voltage-controlled current sink: when external resistors set the cathode voltage above Vref, the device draws current through the cathode to maintain Vref at the REF pin. Thermal drift is specified at 14 mV over −40°C to 85°C (I-grade), and dynamic impedance remains ≤0.5 Ω up to 1 kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V (nominal); ±0.5% initial tolerance at 25°C ensures tight output regulation in closed-loop SMPS feedback |
| Operating Temperature | −40°C to +85°C (I-grade); validated for industrial AC/DC and servo drive ambient conditions |
| Sink Current Range | 1 mA to 100 mA; supports direct interface with optocoupler LEDs without external buffering |
| Dynamic Impedance | 0.2 Ω typical (≤0.5 Ω max); enables stable regulation under fast load transients in switching regulators |
| Reference Input Current | 2–4 µA; ultra-low bias current minimizes resistor-divider loading error in high-impedance feedback networks |
| Temp Drift (VI(dev)) | 14 mV max over full range; translates to ~100 ppm/°C average TC, suitable for non-automotive industrial systems |
| Output Noise | Low broadband noise; 160 nV/√Hz at 1 kHz enables clean voltage sensing in precision analog circuits |
Pinout & Package
SOT-23-3 package (2.90 mm × 1.30 mm body), surface-mount, lead-free, RoHS-compliant. Thermal resistance RθJA = 206°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (REF) | Reference input | High-impedance threshold node; connected to resistor divider midpoint to sense regulated output voltage |
| Pin 2 (CATHODE) | Current sink output | Connected to optocoupler anode or error amplifier input; sinks current proportional to output overvoltage |
| Pin 3 (ANODE) | Common return | Typically tied to system ground or power supply return; defines reference potential for REF and CATHODE |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | 2.5 V to 36 V via two external resistors - enables single BOM for multiple output rails in multi-output SMPS |
| Sharp turn-on characteristic | Fast response to output deviations due to active output stage - reduces loop compensation complexity vs. Zener diodes |
| Low output impedance | 0.2 Ω typical - maintains regulation accuracy despite cathode current variations from 1 mA to 100 mA |
| Stability with capacitive loads | Validated stable with ≥0.1 µF CL at VKA = Vref - simplifies EMI filter integration in secondary-side regulation |
| ESD robustness | ±2000 V HBM - withstands handling and board assembly without additional protection circuitry |
Applications
| Rack Server Power | Industrial AC/DC Converter |
|---|---|
Use Scenario: Secondary-side voltage feedback in isolated 48 V–12 V DC/DC modules for telecom/datacom servers. IC Role / Device Role / Timing Role: Shunt reference providing precise 2.495 V threshold to control optocoupler LED current and regulate output voltage. Use Value: ±0.5% initial accuracy ensures <±1% output tolerance across line/load/temperature, meeting PSPL compliance. |
Use Scenario: Output voltage regulation in 300 W industrial AC/DC front-end with universal input (85–265 VAC). IC Role / Device Role / Timing Role: Adjustable shunt reference setting 24 V output via resistor divider; interfaces with TL431-compatible optocoupler driver. Use Value: 14 mV temp drift over −40°C to 85°C guarantees stable regulation in unventilated enclosures. |
| AC Inverter Drive | Servo Drive Control Module |
Use Scenario: Feedback reference for auxiliary 15 V DC bus powering gate drivers and MCU in 3-phase motor inverters. IC Role / Device Role / Timing Role: Precision shunt regulator maintaining stable 15 V despite input ripple and load steps from IGBT gate charging. Use Value: 0.2 Ω dynamic impedance prevents output sag during 100 mA transient current demands from isolated gate drivers. |
Use Scenario: Voltage reference for analog signal conditioning and ADC reference in servo amplifier feedback path. IC Role / Device Role / Timing Role: Low-noise 2.495 V source for 12-bit DAC/ADC reference and op-amp biasing in position/current loops. Use Value: Low 2–4 µA input current avoids gain error in high-Z resistor dividers used for motor current sensing scaling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDBZR | Same A-grade accuracy and I-temp range, but TL431 pinout (REF–ANODE–CATHODE) - not pin-compatible | Requires PCB layout revision; compatible only if redesigning feedback network routing | Select when reusing TL431-based schematics and layout; verify stability with new pinout |
| TLVH431ACDBZR | Lower 1.24 V reference, same SOT-23-3 package and A-grade tolerance, but 30 V max cathode voltage | Not suitable for >30 V outputs; requires recalculation of resistor divider for same output voltage | Choose for low-voltage rails (≤24 V) where reduced headroom improves efficiency and thermal margin |
Compared with TL431ACDBZR, TL432ACDBZT offers identical electrical specs but mandates pinout-aware layout; versus TLVH431ACDBZR, it supports higher output voltages (up to 36 V) at the cost of higher minimum cathode voltage, making it preferred for industrial 24 V/48 V systems.
Availability
TL432ACDBZT 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 TL432ACDBZT 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 ICs, with decades of expertise in precision reference and power control technologies.
The TL43x family was designed for high-reliability voltage regulation in isolated power supplies and industrial control systems, emphasizing accuracy, thermal stability, and ease of use in feedback networks.
FAQ
What is the exact pin configuration of TL432ACDBZT?
The TL432ACDBZT uses SOT-23-3 package with Pin 1 = REF, Pin 2 = CATHODE, Pin 3 = ANODE. This differs from TL431 (Pin 1 = REF, Pin 2 = ANODE, Pin 3 = CATHODE), so direct substitution requires PCB layout modification. The TL432ACDBZT datasheet confirms this pinout in Figure 5-1 and Table 5-1.
What does the 'A' grade signify in TL432ACDBZT?
The 'A' in TL432ACDBZT denotes 1% initial reference voltage tolerance at 25°C (2.470 V to 2.520 V). This is tighter than standard grade (2%) but less precise than B grade (0.5%). The 'C' suffix indicates commercial temperature range (0°C to 70°C), though the full part number TL432ACDBZT is rated for −40°C to 85°C per TI's official documentation.
Can TL432ACDBZT replace a Zener diode directly?
Yes, TL432ACDBZT can directly replace Zener diodes in shunt regulation applications, offering superior performance: sharp turn-on, 0.2 Ω dynamic impedance (vs. Zener's higher impedance), and adjustable output (2.5 V–36 V) using two resistors. However, it requires a minimum cathode current of 0.4–0.6 mA to maintain regulation, unlike passive Zeners.
What is the maximum cathode voltage rating for TL432ACDBZT?
The absolute maximum cathode voltage (VKA) for TL432ACDBZT is 37 V, with recommended operating range from Vref (≈2.5 V) to 36 V. Exceeding 37 V risks permanent damage. This rating is confirmed in Section 6.1 Absolute Maximum Ratings of the TI SLVS543S datasheet.
How does TL432ACDBZT handle temperature variation?
TL432ACDBZT exhibits a maximum reference voltage deviation (VI(dev)) of 14 mV over −40°C to +85°C, corresponding to ~100 ppm/°C average temperature coefficient. This is verified in Section 6.9 Electrical Characteristics (TL432AI) and Figure 6-1, ensuring stable regulation in industrial environments without external compensation.
TL432ACDBZT 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
TL432ACDBZT FAQ
1.How can I place an order for TL432ACDBZT through Aetrix?
Please submit a Request for Quotation (RFQ) for TL432ACDBZT 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 TL432ACDBZT reliable?
The price and inventory of TL432ACDBZT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL432ACDBZT is usually 5 days.
3.What payment methods are accepted for TL432ACDBZT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL432ACDBZT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL432ACDBZT?
TL432ACDBZT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL432ACDBZT 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 TL432ACDBZT?
For technical support, including TL432ACDBZT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL432ACDBZT requirements.
6.How does Aetrix verify that TL432ACDBZT is sourced from the original manufacturer or authorized distributors?
All TL432ACDBZT 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 TL432ACDBZT meets industry standards.
7.What is the process for return or replacement of TL432ACDBZT?
All TL432ACDBZT units undergo pre-shipment inspection (PSI). If there is an issue with TL432ACDBZT, 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 TL432ACDBZT part is unused and in its original packaging.
Return procedure for TL432ACDBZT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL432ACDBZT Tags
-
TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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AN431AN-ATRG1
Diodes Incorporated
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LM4040CYM3-2.5-TR
Microchip Technology
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LM4040CYM3-4.1-TR
Microchip Technology
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LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
Texas Instruments
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LM4041DIM3-ADJ/NOPB
Texas Instruments
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LM4040DIM3X-2.5/NOPB
Texas Instruments
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LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
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