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Texas Instruments TL432BCDBZR
- Part No.:
- TL432BCDBZR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL432BCDBZR.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,860
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Product details
Overview
TL432BCDBZR 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 mA to 100 mA sink current, enabling high-accuracy feedback in isolated DC-DC converters and industrial power supplies.
For engineers reviewing the TL432BCDBZR datasheet, TL432BCDBZR pinout, TL432BCDBZR application, or TL432BCDBZR equivalent, key selection criteria include its B-grade accuracy, Q-temp automotive qualification, low temperature drift (14 mV over −40°C to 125°C), and SOT-23-3 footprint compatibility with space-constrained board layouts.
Technical Context
The TL432BCDBZR implements a three-terminal adjustable shunt regulator architecture with an internal precision reference amplifier and NPN output stage. Its REF pin senses voltage relative to ANODE, triggering cathode current conduction when the divider network exceeds Vref, enabling precise closed-loop regulation without external op-amps.
This device shares identical electrical specifications with TL431 but uses a distinct SOT-23-3 pinout: Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE - differing from TL431's Pin 1 = REF, Pin 2 = ANODE, Pin 3 = CATHODE. It is characterized for Q-temp operation (−40°C to 125°C) and rated for 37 V maximum cathode-anode voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V ±12 mV at 25°C - enables 0.5% system-level voltage setpoint accuracy in feedback networks |
| Initial Tolerance | 0.5% (B grade) - reduces calibration overhead in production test for power supply trimming |
| Temp Range | −40°C to 125°C - qualified for under-hood automotive and industrial motor drive applications |
| Dynamic Impedance | 0.2 Ω typical - maintains stable regulation under fast load transients in switching PSUs |
| Sink Current Range | 1 mA to 100 mA - supports direct optocoupler LED drive and wide-range error amplifier biasing |
| Temp Drift (VIdev) | 14 mV max over full range - ensures ≤0.056%/°C average TC for <±1% total output variation |
| Cathode Voltage Max | 37 V - allows use in 24 V and 36 V industrial bus systems with margin |
Pinout & Package
SOT-23-3 package (2.90 mm × 1.30 mm), surface-mount, lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1: CATHODE | Shunt current output node | Connects to switched node of flyback/forward converter or optocoupler anode; sinks regulated current |
| Pin 2: REF | Reference input threshold | Senses voltage divider output; conduction begins when VREF ≥ 2.495 V relative to ANODE |
| Pin 3: ANODE | Common return/reference ground | Typically tied to system ground or PSU output return; defines reference potential for REF pin |
Key Features
| Feature | Design Value |
|---|---|
| 0.5% Initial Accuracy | Reduces need for post-manufacturing trimming in AC/DC adapters and server VRMs |
| Low 0.2 Ω Dynamic Impedance | Minimizes output voltage deviation during 10–100 mA load steps in SMPS feedback loops |
| Q-Temp Rating (−40°C to 125°C) | Validates performance in automotive engine control units and industrial servo drives |
| 14 mV Total Temp Drift | Enables ±0.5% output stability over full industrial temperature range without compensation |
| 2.495 V Reference Voltage | Matches standard 2.5 V rail requirements while allowing fine-tuning via resistor dividers |
Applications
| Rack Server Power | Industrial AC/DC |
|---|---|
Use Scenario: Secondary-side voltage regulation in isolated 48 V input, 12 V/50 A telecom rectifiers. IC Role / Device Role / Timing Role: Shunt reference in optocoupler-coupled feedback loop, setting precise output voltage via resistor divider on REF pin. Use Value: 0.5% tolerance and 14 mV temp drift ensure output stays within ±1% over temperature, meeting IEC 62368-1 hold-up and accuracy requirements. |
Use Scenario: Output voltage sensing in DIN-rail mounted 24 V, 20 A industrial power supplies. IC Role / Device Role / Timing Role: Precision shunt reference driving TL431-compatible error amplifier inputs in linear post-regulators. Use Value: SOT-23-3 footprint saves PCB area versus SOIC-8 alternatives; 100 mA sink capability directly drives optocoupler LEDs without buffer transistors. |
| AC Inverter Drives | Servo Drive Control |
Use Scenario: DC bus voltage monitoring and overvoltage protection threshold in 3-phase 400 V inverters. IC Role / Device Role / Timing Role: Adjustable shunt reference configured as comparator input for fast OV trip circuit. Use Value: 37 V absolute max cathode voltage rating provides 75 V headroom above 400 V DC bus peaks, ensuring robustness during transients. |
Use Scenario: Feedback reference for motor phase current sensing amplifiers in closed-loop servo controllers. IC Role / Device Role / Timing Role: Stable 2.495 V reference source for ADC reference buffers and analog signal conditioning stages. Use Value: Low 0.2 Ω dynamic impedance prevents reference droop during high-frequency PWM current sampling, preserving measurement fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431BQDBZR | Same B-grade accuracy and Q-temp rating, but TL431 pinout (REF-ANODE-CATHODE) | Requires PCB layout revision due to reversed REF/CATHODE pins; not drop-in compatible | Select only if legacy TL431 layout reuse is prioritized over footprint optimization |
| TLVH431AQDBVR | Higher 1.5% initial tolerance, lower 1.24 V reference, 30 V max cathode voltage | Better suited for low-voltage battery-powered systems; insufficient for 24 V+ industrial rails | Choose for cost-sensitive consumer applications below 12 V where 2.5 V reference is unnecessary |
Compared with TL431BQDBZR and TLVH431AQDBVR, TL432BCDBZR uniquely combines B-grade precision, Q-temp operation, 37 V rating, and SOT-23-3 pinout optimized for new designs requiring minimal board area and high reliability in harsh environments.
Availability
TL432BCDBZR is available at Aetrix Electronics and suitable for rack server power, industrial AC/DC, and servo drive control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TL432BCDBZR 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 as pin-compatible, adjustable shunt references to replace discrete Zener diodes in feedback paths of switching and linear regulators, targeting high-reliability industrial, automotive, and computing power systems.
FAQ
What is the reference voltage tolerance of TL432BCDBZR at 25°C?
The TL432BCDBZR has a 0.5% initial reference voltage tolerance at 25°C, corresponding to a 2.495 V nominal Vref with ±12 mV deviation. This B-grade specification is confirmed in Section 6.11 of the TI SLVS543S datasheet and applies specifically to the TL432BCDBZR variant with Q-temp qualification.
How does the TL432BCDBZR pinout differ from TL431 devices?
The TL432BCDBZR uses SOT-23-3 pinout: Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE. This differs from TL431's SOT-23-3 assignment (Pin 1 = REF, Pin 2 = ANODE, Pin 3 = CATHODE). The TL432BCDBZR pinout is explicitly defined in Figure 5-1 and Table 5-1 of the datasheet and must be verified before PCB layout.
What is the maximum operating temperature range for TL432BCDBZR?
The TL432BCDBZR is rated for operation from −40°C to 125°C (Q-temp grade), as specified in the Device Comparison Table and Section 6.13 Electrical Characteristics. This range is validated per JEDEC JESD22-A108 and supports under-hood automotive and industrial motor control applications.
Can TL432BCDBZR replace a Zener diode in voltage regulation circuits?
Yes, the TL432BCDBZR is explicitly designed as a superior replacement for Zener diodes in shunt regulation applications. Its 0.2 Ω dynamic impedance, sharp turn-on characteristic, and 0.5% accuracy provide significantly better line/load regulation and thermal stability than standard Zeners, as stated in the Description section of the datasheet.
What is the minimum cathode current required for regulation in TL432BCDBZR?
The TL432BCDBZR requires a minimum cathode current of 0.4 mA to maintain regulation, as specified in Section 6.11 (TL432BC characteristics) under Imin. This value is measured at VKA = Vref and ensures stable reference behavior even at light loads in low-power standby modes.
TL432BCDBZR 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
TL432BCDBZR FAQ
1.How can I place an order for TL432BCDBZR through Aetrix?
Please submit a Request for Quotation (RFQ) for TL432BCDBZR 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 TL432BCDBZR reliable?
The price and inventory of TL432BCDBZR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL432BCDBZR is usually 5 days.
3.What payment methods are accepted for TL432BCDBZR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL432BCDBZR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL432BCDBZR?
TL432BCDBZR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL432BCDBZR 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 TL432BCDBZR?
For technical support, including TL432BCDBZR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL432BCDBZR requirements.
6.How does Aetrix verify that TL432BCDBZR is sourced from the original manufacturer or authorized distributors?
All TL432BCDBZR 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 TL432BCDBZR meets industry standards.
7.What is the process for return or replacement of TL432BCDBZR?
All TL432BCDBZR units undergo pre-shipment inspection (PSI). If there is an issue with TL432BCDBZR, 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 TL432BCDBZR part is unused and in its original packaging.
Return procedure for TL432BCDBZR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL432BCDBZR Tags
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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
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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
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AZ431LANTR-G1
Diodes Incorporated
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