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Texas Instruments TL432BIDBZR
- Part No.:
- TL432BIDBZR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL432BIDBZR.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:17,497
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Product details
Overview
TL432BIDBZR 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, enabling high-accuracy feedback in isolated DC/DC converters and industrial power supplies.
For engineers reviewing the TL432BIDBZR datasheet, TL432BIDBZR pinout, TL432BIDBZR application, or TL432BIDBZR equivalent, key selection criteria include its Q-grade temperature range, B-grade accuracy, SOT-23-3 footprint compatibility, and shunt regulator topology for compact, low-noise voltage setting in space-constrained power control circuits.
Technical Context
The TL432BIDBZR implements a three-terminal adjustable shunt regulator architecture with an internal 2.495 V reference and error amplifier driving an NPN output stage. Its sharp turn-on characteristic and low 6 mV (C-temp) / 14 mV (I/Q-temp) reference voltage drift over temperature enable stable regulation without external compensation in most configurations.
Unlike the TL431, the TL432 variant uses a different pinout in DBZ (SOT-23-3) packaging: Cathode–Ref–Anode (vs. Ref–Cathode–Anode), requiring PCB layout revision when substituting. The device operates as a two-terminal shunt element where cathode voltage is set by external resistor dividers connected between cathode and anode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V ±12.5 mV at 25°C - enables precise feedback threshold setting in switching power supply error amplifiers |
| Initial Tolerance | ±0.5% (B grade) - ensures ≤12.5 mV absolute error at room temperature for high-accuracy regulation |
| Temp Range | −40°C to +125°C (Q grade) - supports operation in automotive under-hood and industrial motor drive environments |
| Dynamic Impedance | 0.2 Ω typical - minimizes output voltage variation under load transients in closed-loop feedback paths |
| Sink Current Range | 1 mA to 100 mA - accommodates wide-range biasing and error signal injection in isolated flyback and forward converters |
| Output Noise | Low broadband noise - reduces jitter and ripple in sensitive analog feedback loops without added filtering |
| Ref Input Current | 2–4 µA - allows use of high-value divider resistors (e.g., 1 MΩ) to minimize quiescent power loss |
Pinout & Package
TL432BIDBZR is housed in a 3-pin SOT-23-3 (DBZ) package measuring 2.90 mm × 1.30 mm. Pin 1 is Cathode, Pin 2 is Reference, Pin 3 is Anode - distinct from TL431's Ref–Cathode–Anode order, requiring layout verification during replacement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (CATHODE) | Shunt current input / regulated voltage node | Connected to primary-side switch node or optocoupler LED anode; voltage here is set by external resistor divider |
| Pin 2 (REF) | Reference input / error amplifier inverting input | Senses divided output voltage; regulates cathode voltage when REF = 2.495 V |
| Pin 3 (ANODE) | Common return / ground reference | Typically tied to system ground or secondary-side common; defines reference potential for entire shunt circuit |
Key Features
| Feature | Design Value |
|---|---|
| 0.5% reference accuracy | Enables ±0.5% output voltage regulation in power supplies without trimming or calibration |
| −40°C to +125°C operation | Qualified for extended-temperature industrial and automotive applications without derating |
| 0.2 Ω dynamic impedance | Stabilizes feedback loop gain across load steps, reducing need for external compensation |
| 14 mV max temp drift (Q grade) | Ensures <±0.06% output voltage drift over full operating range in critical timing or sensing circuits |
| Low 2–4 µA reference current | Permits >100 kΩ divider networks, cutting standby power in battery-backed or energy-efficient systems |
Applications
| Rack Server Power | Industrial AC/DC |
|---|---|
Use Scenario: Secondary-side voltage feedback in isolated 48 V to 12 V/5 V DC/DC modules for datacenter PSUs. IC Role / Device Role / Timing Role: Shunt reference providing precise 2.495 V threshold to optocoupler-driven error amplifier. Use Value: Enables ±0.5% output regulation across line/load/temperature, meeting 80 PLUS Titanium efficiency requirements. | Use Scenario: Output voltage regulation in DIN-rail mounted 24 V/48 V industrial power supplies. IC Role / Device Role / Timing Role: Adjustable shunt reference setting feedback point for PWM controller in flyback topology. Use Value: Maintains stable output under wide ambient temperature swings (−40°C to +70°C cabinet) with no thermal recalibration. |
| AC Inverter & VF Drives | Servo Drive Control Module |
Use Scenario: DC bus voltage monitoring and overvoltage protection in 3-phase VFDs. IC Role / Device Role / Timing Role: Precision reference for comparator-based bus voltage trip detection. Use Value: Delivers repeatable 390 V overvoltage threshold (via 156:1 resistor divider) with <±2 V error over lifetime. | Use Scenario: Isolated feedback for auxiliary 15 V bias rail powering gate drivers and position encoder interfaces. IC Role / Device Role / Timing Role: Shunt regulator stabilizing optocoupler LED current in isolated feedback path. Use Value: Ensures consistent gate drive timing and encoder power integrity despite primary-side EMI and load transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431BIDBZR | Different pinout (Ref–Cathode–Anode vs. Cathode–Ref–Anode); identical electrical specs | Requires PCB redesign due to reversed Cathode/Ref pins; not drop-in compatible | Select only if legacy TL431 layout is reused and pinout can be adapted |
| TLVH431BIDBZR | Lower 1.24 V reference voltage; 0.5% tolerance; same Q-temp grade and SOT-23-3 package | Enables lower-output-voltage regulation (e.g., 3.3 V, 2.5 V) without resistor scaling; higher ref current (100 nA typ) | Choose when designing new 3.3 V or sub-5 V rails where 2.495 V reference is excessive |
Compared with TL431BIDBZR, TL432BIDBZR avoids pinout conflict in new designs but mandates layout verification; versus TLVH431BIDBZR, it provides higher reference voltage for better noise immunity in 12–24 V systems but lacks sub-2.5 V capability.
Availability
TL432BIDBZR is available at Aetrix Electronics and suitable for rack server power, industrial AC/DC, and servo drive control module applications requiring stable component supply, long-term lifecycle support, and Q-grade temperature qualification.
Supply support for TL432BIDBZR 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 was designed for precision voltage regulation in power supply feedback loops, offering Zener diode replacement with superior accuracy, temperature stability, and sink-current flexibility across commercial, industrial, and automotive applications.
FAQ
What is the reference voltage tolerance of TL432BIDBZR at 25°C?
The TL432BIDBZR has a reference voltage tolerance of ±0.5% at 25°C, corresponding to a 2.495 V nominal reference with a maximum deviation of ±12.5 mV. 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 datasheet. TL432BIDBZR maintains this tolerance within its full −40°C to +125°C operating range.
How does TL432BIDBZR differ from TL431BIDBZR in pin configuration?
TL432BIDBZR uses a Cathode–Ref–Anode pinout (Pin 1=CATHODE, Pin 2=REF, Pin 3=ANODE) in the SOT-23-3 (DBZ) package, whereas TL431BIDBZR uses Ref–Cathode–Anode. This reversal means direct substitution requires PCB layout modification. The electrical specifications-including reference voltage, tolerance, temperature range, and dynamic impedance-are identical between the two parts.
What is the maximum cathode voltage rating for TL432BIDBZR?
The absolute maximum cathode voltage (VKA) for TL432BIDBZR is 37 V, referenced to the anode. The recommended operating range is Vref to 36 V. Exceeding 37 V risks permanent damage. This rating is consistent across all TL431/TL432 variants and is specified in Section 6.1 Absolute Maximum Ratings of the datasheet.
Can TL432BIDBZR operate in automotive under-hood environments?
Yes, TL432BIDBZR is qualified for −40°C to +125°C operation (Q grade), making it suitable for automotive under-hood applications such as engine control unit (ECU) power supplies and transmission control modules. Its 14 mV max reference voltage deviation over this range and robust ESD ratings (±2000 V HBM) meet AEC-Q100 stress test expectations for shunt references in harsh environments.
What is the typical dynamic impedance of TL432BIDBZR and why does it matter?
TL432BIDBZR has a typical dynamic impedance of 0.2 Ω, measured at ≤1 kHz with cathode current from 1 mA to 100 mA. This low value ensures minimal output voltage variation during load transients-critical for maintaining tight regulation in switching power supplies. It directly improves loop stability and reduces required output capacitance compared to higher-impedance references like discrete Zener diodes.
TL432BIDBZR 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:
- ±0.5%
- 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
TL432BIDBZR FAQ
1.How can I place an order for TL432BIDBZR through Aetrix?
Please submit a Request for Quotation (RFQ) for TL432BIDBZR 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 TL432BIDBZR reliable?
The price and inventory of TL432BIDBZR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL432BIDBZR is usually 5 days.
3.What payment methods are accepted for TL432BIDBZR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL432BIDBZR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL432BIDBZR?
TL432BIDBZR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL432BIDBZR 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 TL432BIDBZR?
For technical support, including TL432BIDBZR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL432BIDBZR requirements.
6.How does Aetrix verify that TL432BIDBZR is sourced from the original manufacturer or authorized distributors?
All TL432BIDBZR 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 TL432BIDBZR meets industry standards.
7.What is the process for return or replacement of TL432BIDBZR?
All TL432BIDBZR units undergo pre-shipment inspection (PSI). If there is an issue with TL432BIDBZR, 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 TL432BIDBZR part is unused and in its original packaging.
Return procedure for TL432BIDBZR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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