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Texas Instruments TL432IDBZT
- Part No.:
- TL432IDBZT
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL432IDBZT.pdf
- Description:
- IC VREF SHUNT ADJ 2.2% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,536
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Product details
Overview
TL432IDBZT from Texas Instruments is a precision programmable shunt voltage reference in SOT-23-3 package, featuring 0.5% initial reference voltage tolerance at 25°C, adjustable output from 2.495 V to 36 V, and operation across −40°C to 125°C. It delivers 0.2 Ω typical dynamic impedance and supports 1–100 mA sink current, widely used in isolated feedback loops of AC/DC adapters and servo drive control modules.
For engineers reviewing the TL432IDBZT datasheet, TL432IDBZT pinout, TL432IDBZT application, or TL432IDBZT equivalent, key selection criteria include its Q-grade temperature range, DBZ package pin compatibility with TL431 variants, low 14 mV max reference voltage drift over full temperature range, and sharp turn-on characteristic enabling Zener diode replacement in high-stability regulation circuits.
Technical Context
The TL432IDBZT implements a three-terminal adjustable shunt regulator architecture with an internal error amplifier, reference voltage source, and output transistor. Its REF–ANODE–CATHODE pinout (Pin 1–2–3) differs from TL431DBZ, requiring board-level redesign when substituting between families.
It operates as a precision voltage-controlled current sink: when the REF pin voltage exceeds 2.495 V, the device pulls current from CATHODE to ANODE to maintain regulation. Thermal stability is ensured by low 14 mV total deviation over −40°C to 125°C and 0.2 Ω dynamic impedance below 1 kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V ±12.5 mV (0.5% B-grade tolerance at 25°C); sets precise regulation threshold for feedback networks. |
| Temp Range | −40°C to +125°C (Q-grade); enables use in automotive under-hood and industrial motor drive environments. |
| Dynamic Impedance | 0.2 Ω typical (≤0.5 Ω max); ensures minimal output voltage shift under load transients in switching power supplies. |
| Sink Current Range | 1 mA to 100 mA; supports direct interface with optocoupler LEDs and gate drivers without external buffering. |
| Ref Input Current | 2–4 µA typical; allows high-value resistor dividers (>1 MΩ) to minimize power loss in battery-backed systems. |
| Voltage Drift | ≤14 mV over full temperature range; guarantees <0.05%/°C effective tempco for stable closed-loop performance. |
| Output Noise | Low broadband noise; enables clean regulation in sensitive analog signal chains and ADC reference buffers. |
Pinout & Package
SOT-23-3 (DBZ) package: 2.90 mm × 1.30 mm body, surface-mount, lead-free, RoHS-compliant. Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE (Pin 1) | Current sink node | Connects to primary-side controller feedback input (e.g., optocoupler cathode); carries full regulation current. |
| REF (Pin 2) | Reference sense input | High-impedance input monitoring voltage divider output; triggers regulation when ≥2.495 V. |
| ANODE (Pin 3) | Common return path | Typically tied to system ground or secondary-side common; completes current path for shunt operation. |
Key Features
| Feature | Design Value |
|---|---|
| 0.5% Initial Accuracy (B Grade) | Enables single-resistor trimming elimination in factory-calibrated power supplies, reducing BOM cost and test time. |
| −40°C to +125°C Operation | Validates functionality in automotive engine control units and industrial inverters without derating or thermal margining. |
| 0.2 Ω Dynamic Impedance | Maintains <10 mV output variation during 50 mA load steps-critical for maintaining PSRR in multi-rail DC/DC converters. |
| Sharp Turn-On Characteristic | Eliminates need for external hysteresis in overvoltage protection circuits, simplifying crowbar and latch designs. |
| Low 2–4 µA Reference Current | Permits use of >500 kΩ feedback dividers, cutting standby power in energy-efficient AC/DC adapters below 75 mW. |
Applications
| Rack Server Power | Industrial AC/DC Converter |
|---|---|
Use Scenario: Secondary-side voltage sensing in isolated 48 V to 12 V/5 V intermediate bus converters with optocoupler feedback. IC Role / Device Role / Timing Role: Precision shunt reference generating error signal for primary-side PWM controller via optocoupler LED current modulation. Use Value: 0.5% reference accuracy and 14 mV temp drift ensure ±1% output regulation across full operating temperature, meeting server PSU efficiency and reliability standards. |
Use Scenario: Output voltage regulation in 3 kW industrial rectifier with digital control loop and analog backup path. IC Role / Device Role / Timing Role: Analog fallback reference for redundant voltage monitoring; sinks current into isolation amplifier input during microcontroller fault conditions. Use Value: 100 mA sink capability and −40°C to 125°C rating allow direct integration into harsh-environment control boards without heatsinking or derating. |
| Servo Drive Control Module | Notebook PC Power Adapter |
Use Scenario: Isolated auxiliary supply regulation for gate driver ICs and current-sense amplifiers in 3-phase IGBT inverter stages. IC Role / Device Role / Timing Role: Shunt reference setting bias point for isolated DC/DC converter powering isolated gate drivers and analog front-end circuitry. Use Value: Low 0.2 Ω dynamic impedance prevents output droop during fast-switching gate charge/discharge cycles, preserving timing margins. |
Use Scenario: Feedback reference in compact 65 W GaN-based USB-C PD adapter with <15 mm × 15 mm PCB footprint. IC Role / Device Role / Timing Role: Primary-side regulation reference interfacing with optocoupler to close voltage loop without secondary-side controller. Use Value: SOT-23-3 package and 2–4 µA reference current enable ultra-low-power standby (<30 mW) while maintaining tight ±5% output tolerance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431IDBZR | Same electrical specs but TL431 pinout (REF–ANODE–CATHODE); requires PCB layout change. | Used where legacy TL431 footprints exist; not drop-in compatible with TL432IDBZT. | Select only if redesigning for pin-compatibility with existing TL431-based schematics. |
| TLVH431QDBZRQ1 | Automotive-grade (AEC-Q100), 1.24 V reference, 1% tolerance, lower max voltage (20 V). | Targeted at automotive infotainment and ADAS power rails-not suitable for 36 V industrial rails. | Choose for automotive safety-critical systems requiring AEC-Q100 qualification and lower reference voltage. |
Compared with TL431IDBZR, TL432IDBZT offers identical regulation performance but mandates pinout-aware layout; versus TLVH431QDBZRQ1, it provides higher voltage range and tighter tolerance at the cost of automotive qualification-making TL432IDBZT optimal for industrial and computing power applications demanding 36 V headroom and 0.5% accuracy.
Availability
TL432IDBZT 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 TL432IDBZT 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 analog ICs and power management solutions.
The TL43x family was designed for high-accuracy, low-drift voltage regulation in isolated power supplies, replacing discrete Zener diodes with integrated active regulation-targeting industrial, computing, and motor control applications.
FAQ
What is the reference voltage tolerance of TL432IDBZT at 25°C?
The TL432IDBZT has a 0.5% initial reference voltage tolerance at 25°C, corresponding to a 2.495 V nominal value with ±12.5 mV deviation. This B-grade accuracy is specified in the Electrical Characteristics table for TL432BQ devices and confirmed across all test conditions in Section 6.13 of the TI datasheet SLVS543S.
How does TL432IDBZT differ from TL431IDBZR in pin configuration?
TL432IDBZT uses REF–ANODE–CATHODE pinout (Pin 1–2–3), whereas TL431IDBZR uses REF–CATHODE–ANODE. This inversion means TL432IDBZT cannot be substituted into a TL431 footprint without PCB revision. The functional behavior is identical, but physical connectivity is incompatible.
What is the maximum operating temperature range for TL432IDBZT?
TL432IDBZT is rated for operation from −40°C to +125°C (Q-grade), verified per Section 4 Device Comparison Table and Section 6.7 Electrical Characteristics. This extended range supports deployment in automotive under-hood modules and industrial motor drives where ambient temperatures exceed 85°C.
Can TL432IDBZT replace a Zener diode in a linear regulator design?
Yes-TL432IDBZT is explicitly designed as a superior Zener diode replacement. Its active topology delivers 0.2 Ω dynamic impedance (vs. >10 Ω for typical Zeners), 0.5% accuracy, and sharp turn-on, enabling stable regulation in series-pass and shunt configurations without external compensation in most cases.
What is the minimum cathode current required for regulation in TL432IDBZT?
The TL432IDBZT requires a minimum cathode current of 0.4 mA to maintain regulation, as specified in Sections 6.5–6.13 under "Imin" for all Q-grade variants. Below this threshold, the device exits regulation and behaves as an open circuit between CATHODE and ANODE.
TL432IDBZT 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:
- ±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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
TL432IDBZT FAQ
1.How can I place an order for TL432IDBZT through Aetrix?
Please submit a Request for Quotation (RFQ) for TL432IDBZT 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 TL432IDBZT reliable?
The price and inventory of TL432IDBZT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL432IDBZT is usually 5 days.
3.What payment methods are accepted for TL432IDBZT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL432IDBZT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL432IDBZT?
TL432IDBZT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL432IDBZT 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 TL432IDBZT?
For technical support, including TL432IDBZT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL432IDBZT requirements.
6.How does Aetrix verify that TL432IDBZT is sourced from the original manufacturer or authorized distributors?
All TL432IDBZT 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 TL432IDBZT meets industry standards.
7.What is the process for return or replacement of TL432IDBZT?
All TL432IDBZT units undergo pre-shipment inspection (PSI). If there is an issue with TL432IDBZT, 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 TL432IDBZT part is unused and in its original packaging.
Return procedure for TL432IDBZT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL432IDBZT Tags
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TL431AIDBZR
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TL431BQDBZR
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LM4040CYM3-2.5-TR
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LM4040CYM3-4.1-TR
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LM4040EIM3-2.5/NOPB
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AZ431LBNTR-G1
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
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AZ431LANTR-G1
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