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Texas Instruments TL432BCDBZT
- Part No.:
- TL432BCDBZT
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL432BCDBZT.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:6,179
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Product details
Overview
TL432BCDBZT 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 (Q-grade). 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 TL432BCDBZT datasheet, TL432BCDBZT pinout, TL432BCDBZT application, or TL432BCDBZT equivalent, key selection criteria include its Q-grade temperature range, SOT-23-3 pinout distinction from TL431, 6 mV max reference voltage drift over temperature, low 2–4 µA reference input current, and compatibility with standard resistor-divider programming for adjustable regulation.
Technical Context
The TL432BCDBZT implements a three-terminal adjustable shunt regulator architecture with an internal precision bandgap reference, error amplifier, and NPN output stage. Its REF–CATHODE–ANODE pinout (SOT-23-3) differs from TL431, requiring layout adaptation when replacing legacy designs.
It operates as a two-terminal device when ANODE is grounded, with cathode sinking current proportional to the voltage difference between REF and internal 2.495 V threshold. The 0.2 Ω dynamic impedance and sharp turn-on characteristic enable stable regulation even under fast load transients in switching power supply feedback loops.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V ±12 mV at 25°C (B-grade); sets precise feedback threshold for power supply regulation |
| Initial Tolerance | ±0.5% at 25°C; enables <1% output voltage error without trimming in mid-power adapters |
| Temp Range | −40°C to +125°C (Q-grade); qualified for automotive engine control and industrial servo drive environments |
| Dynamic Impedance | 0.2 Ω typical; ensures minimal output voltage shift under 10–100 mA load variation |
| Sink Current Range | 1 mA to 100 mA; supports direct interface with optocoupler LEDs in isolated flyback feedback paths |
| Ref Input Current | 2–4 µA; allows use of high-value divider resistors (>1 MΩ), reducing quiescent power in battery-backed systems |
| Voltage Drift | ≤14 mV over full temperature range; maintains ≤0.56% total output error in wide-temperature applications |
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 - distinct from TL431's CATHODE–REF–ANODE order.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE (Pin 1) | Current sink node | Connects to primary-side optocoupler LED anode or regulation node; carries full output error current |
| REF (Pin 2) | Reference input | High-impedance sensing point; compares external divider voltage against internal 2.495 V bandgap |
| ANODE (Pin 3) | Common return | Typically tied to system ground or negative rail; defines voltage reference for REF and CATHODE terminals |
Key Features
| Feature | Design Value |
|---|---|
| Q-grade temperature rating | −40°C to +125°C operation verified per JEDEC JESD22-A108; suitable for under-hood automotive modules |
| B-grade precision | 0.5% initial reference tolerance eliminates need for post-manufacture calibration in cost-sensitive power supplies |
| Low dynamic impedance | 0.2 Ω typical ensures <25 mV output deviation across 100 mA load step, critical for tight-regulation SMPS |
| Low reference current | 2–4 µA input current enables >1 MΩ feedback dividers, cutting standby power by >50% vs higher-current references |
| Shunt regulator topology | Self-contained 3-terminal architecture requires no external biasing; simplifies PCB layout vs series references |
Applications
| AC/DC Power Adapter | Rack Server PSU |
|---|---|
Use Scenario: Secondary-side voltage feedback in 65 W notebook adapter with optocoupler isolation. IC Role / Device Role / Timing Role: Shunt reference generating error signal for optocoupler LED drive; sets 19.5 V output with ±0.1 V accuracy. Use Value: B-grade tolerance and Q-temp range ensure consistent regulation across ambient temperatures and product lifetime without recalibration. |
Use Scenario: Output voltage monitoring and trim in 12 V/54 A rack server power supply with digital PMBus interface. IC Role / Device Role / Timing Role: Precision analog feedback element feeding ADC input of digital controller; provides redundant analog overvoltage protection. Use Value: 0.2 Ω dynamic impedance prevents output droop during 20 A transient loads, maintaining system stability during CPU burst cycles. |
| Industrial Servo Drive | AC Inverter Control |
Use Scenario: DC bus voltage sensing and regulation in 7.5 kW servo amplifier with regenerative braking. IC Role / Device Role / Timing Role: High-accuracy shunt reference for isolated voltage divider feeding isolated sigma-delta ADC. Use Value: 14 mV max temp drift ensures <0.1% full-scale error over motor cabinet temperature swing (−25°C to +85°C). |
Use Scenario: Feedback reference for 3-phase IGBT gate driver supply regulation in HVAC inverter drives. IC Role / Device Role / Timing Role: Stable 5.0 V reference source for isolated DC/DC converter powering gate drivers and sensors. Use Value: SOT-23-3 footprint and Q-grade rating allow placement near heat-generating IGBT modules without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431BCDBZT | Same electrical specs but CATHODE–REF–ANODE pinout (vs TL432's CATHODE–REF–ANODE reversed); not pin-compatible | Requires PCB redesign due to swapped REF/ANODE pins; unsuitable for drop-in replacement | Select TL431BCDBZT only if existing layout uses TL431 pinout and temperature range (−40°C to 85°C) suffices |
| TL432BQDBZR | Same Q-grade spec and B-tolerance, but in SOT-23-5 package with NC pins; identical REF/CATHODE/ANODE function mapping | Offers additional NC pins for noise shielding or thermal relief; larger footprint than DBZT | Choose TL432BQDBZR when board space permits and enhanced thermal performance (RθJA = 206°C/W vs 52°C/W for DBZT) is needed |
Compared with TL431BCDBZT, TL432BCDBZT provides identical precision and temperature range but mandates layout revision due to pinout reversal; versus TL432BQDBZR, it trades thermal performance and noise margin for minimal footprint-critical for ultra-compact AC/DC adapters.
Availability
TL432BCDBZT is available at Aetrix Electronics and suitable for rack server power, industrial AC/DC, and AC inverter & VF drive applications requiring stable component supply, long-term lifecycle support, and automotive-qualified temperature performance.
Supply support for TL432BCDBZT 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 design.
The TL43x family was engineered for high-reliability voltage regulation in power conversion systems, emphasizing accuracy, thermal stability, and ease of implementation across consumer, industrial, and automotive markets.
FAQ
What is the reference voltage tolerance of TL432BCDBZT at 25°C?
The TL432BCDBZT has a reference voltage tolerance of ±0.5% at 25°C (B-grade), corresponding to a 2.495 V nominal output with ±12 mV absolute deviation. This specification is verified per TI's SLVS543S datasheet Section 6.11 and enables high-accuracy feedback without external trimming in TL432BCDBZT-based power supplies.
How does the TL432BCDBZT pinout differ from TL431 devices?
The TL432BCDBZT uses a CATHODE–REF–ANODE pinout (Pin 1–2–3) in SOT-23-3, whereas TL431 variants use CATHODE–ANODE–REF. This reversal means TL432BCDBZT is not pin-compatible with TL431BCDBZT despite identical electrical behavior-direct substitution requires PCB layout modification to avoid misconnection.
What is the maximum operating temperature range for TL432BCDBZT?
The TL432BCDBZT is rated for operation from −40°C to +125°C (Q-grade), validated per JEDEC JESD22-A108. This extended range supports deployment in under-hood automotive modules, industrial servo drives, and high-ambient-temperature power systems where standard commercial-grade references would fail.
Can TL432BCDBZT replace a Zener diode in voltage regulation circuits?
Yes-the TL432BCDBZT is explicitly designed as a superior Zener diode replacement, offering 0.5% initial accuracy vs typical 5–10% Zener tolerance, 0.2 Ω dynamic impedance vs 10–100 Ω for Zeners, and sharp turn-on characteristics. Its active circuitry enables stable regulation in TL432BCDBZT-based adjustable supplies where passive Zeners exhibit poor line/load regulation.
What is the typical dynamic impedance of TL432BCDBZT and why does it matter?
The TL432BCDBZT has a typical dynamic impedance of 0.2 Ω, measured at ≤1 kHz with 1–100 mA cathode current. This low value minimizes output voltage variation under load transients-e.g., a 50 mA step causes only 10 mV shift-making TL432BCDBZT ideal for tightly regulated switch-mode power supply feedback loops where stability and accuracy are critical.
TL432BCDBZT 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
TL432BCDBZT FAQ
1.How can I place an order for TL432BCDBZT through Aetrix?
Please submit a Request for Quotation (RFQ) for TL432BCDBZT 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 TL432BCDBZT reliable?
The price and inventory of TL432BCDBZT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL432BCDBZT is usually 5 days.
3.What payment methods are accepted for TL432BCDBZT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL432BCDBZT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL432BCDBZT?
TL432BCDBZT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL432BCDBZT 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 TL432BCDBZT?
For technical support, including TL432BCDBZT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL432BCDBZT requirements.
6.How does Aetrix verify that TL432BCDBZT is sourced from the original manufacturer or authorized distributors?
All TL432BCDBZT 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 TL432BCDBZT meets industry standards.
7.What is the process for return or replacement of TL432BCDBZT?
All TL432BCDBZT units undergo pre-shipment inspection (PSI). If there is an issue with TL432BCDBZT, 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 TL432BCDBZT part is unused and in its original packaging.
Return procedure for TL432BCDBZT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL432BCDBZT Tags
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AZ431LBNTR-G1
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LM4040DIM3X-2.5/NOPB
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AZ431LANTR-G1
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