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Texas Instruments TL432BQDBZR
- Part No.:
- TL432BQDBZR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL432BQDBZR.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,862
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Product details
Overview
TL432BQDBZR 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, −40°C to 125°C operating temperature range, and 14 mV max reference voltage deviation over full temperature range. It delivers 2.483–2.507 V nominal Vref with 0.2 Ω typical dynamic impedance and supports sink-current capability from 1 mA to 100 mA - used for feedback regulation in isolated DC/DC converters and industrial power supplies.
For engineers reviewing the TL432BQDBZR datasheet, TL432BQDBZR pinout, TL432BQDBZR application, or TL432BQDBZR equivalent, key selection criteria include automotive-grade thermal stability (Q-temp), tight 0.5% B-grade accuracy, SOT-23-3 footprint compatibility, and verified low-noise performance in closed-loop voltage sensing circuits.
Technical Context
The TL432BQDBZR implements a three-terminal adjustable shunt regulator architecture with an internal error amplifier, reference, and output transistor. Its REF pin senses voltage relative to ANODE, enabling precise feedback control when paired with external resistive dividers. The device operates as a high-gain, low-impedance current sink above Vref threshold.
Unlike TL431 variants, TL432BQDBZR uses a distinct pinout: Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE. This configuration avoids direct pin compatibility with TL431DBZR but enables optimized PCB layout for compact feedback networks in space-constrained power modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Vref Tolerance | ±0.5% at 25°C - ensures ≤12.5 mV absolute error in 2.5 V reference setting for high-accuracy feedback loops. |
| Operating Temp Range | −40°C to +125°C - qualified for under-hood automotive and industrial ambient environments without derating. |
| Vref Deviation | Max 14 mV over full temperature range - guarantees stable regulation across thermal cycling in servo drives and AC inverters. |
| Dynamic Impedance | 0.2 Ω typical - minimizes output voltage perturbation during transient load steps in switching power supply feedback paths. |
| Sink Current Range | 1 mA to 100 mA - supports direct interface with optocoupler LEDs and discrete transistor bases without external buffering. |
| Reference Input Current | 2–4 µA - enables high-impedance resistor divider design (e.g., 1 MΩ/1 MΩ) with negligible current-induced error. |
| Min Cathode Current | 0.4–0.7 mA - defines lowest usable feedback current before regulation loss, critical for ultra-low-power standby modes. |
Pinout & Package
SOT-23-3 package (2.90 mm × 1.30 mm), surface-mount, lead-free, RoHS-compliant. Thermal resistance RθJA = 206°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1: CATHODE | Shunt current input / voltage sense node | Connects to primary-side switch node or optocoupler anode; carries full regulated sink current. |
| Pin 2: REF | Reference voltage threshold input | Senses divided output voltage; triggers regulation when voltage exceeds 2.483–2.507 V relative to ANODE. |
| Pin 3: ANODE | Common return / ground reference | Must be connected to system ground or power rail common point; serves as voltage reference for REF pin. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive-Qualified Temperature Range | Rated for −40°C to +125°C operation per AEC-Q100 stress testing - suitable for engine control and battery management systems. |
| Low Dynamic Output Impedance | 0.2 Ω typical - maintains stable reference voltage despite rapid cathode current changes in PWM-controlled supplies. |
| High Initial Accuracy | 0.5% B-grade tolerance - eliminates need for post-manufacturing calibration in factory-set power rails. |
| Low Reference Input Current | 2–4 µA - allows use of high-value feedback resistors, reducing power loss and thermal drift in precision dividers. |
| Sharp Turn-On Characteristic | Active output circuitry enables fast response to reference threshold crossing - improves transient recovery in digitally controlled PSUs. |
Applications
| Rack Server Power | Industrial AC/DC Converter |
|---|---|
Use Scenario: Secondary-side voltage feedback in isolated 48 V to 12 V DC/DC modules for data center servers. IC Role / Device Role / Timing Role: Shunt reference providing precise 12 V regulation via optocoupler-coupled error signal to primary-side controller. Use Value: 0.5% Vref tolerance ensures ±60 mV output accuracy; 125°C rating supports high-density board layouts near hot components. | Use Scenario: Output voltage regulation in 3 kW industrial AC/DC front-end power supplies. IC Role / Device Role / Timing Role: Adjustable shunt reference setting 24 V output using 10 kΩ/10 kΩ resistor divider on secondary side. Use Value: 14 mV max Vref deviation over temperature prevents output drift beyond ±0.06% across ambient extremes. |
| AC Inverter Drive | Servo Drive Control Module |
Use Scenario: Feedback reference for DC bus voltage monitoring and overvoltage protection in 3-phase motor drives. IC Role / Device Role / Timing Role: Precision shunt reference generating trip threshold for comparator-based fault detection circuit. Use Value: Low 2–4 µA Iref enables high-impedance sensing network, minimizing loading on voltage divider and improving noise immunity. | Use Scenario: Isolated feedback path in servo amplifier power stage regulating ±15 V analog supply rails. IC Role / Device Role / Timing Role: Dual-rail reference source (with two TL432BQDBZR units) stabilizing op-amp biasing and DAC reference voltages. Use Value: 0.2 Ω dynamic impedance suppresses ripple coupling into sensitive analog sections, preserving encoder signal integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431BQDBZR | Different pinout (REF/ANODE/CATHODE vs CATHODE/REF/ANODE); identical electrical specs and Q-temp rating. | Requires PCB layout revision due to reversed pin assignment; not drop-in compatible. | Select TL431BQDBZR only if legacy TL431 footprint reuse is mandatory and layout change is acceptable. |
| MAX6008BAUT25+T | Fixed 2.5 V output (non-adjustable); 0.2% initial accuracy; SO-6 package; higher cost; lower temp range (−40°C to +85°C). | Limited to fixed-voltage applications; unsuitable for adjustable outputs >2.5 V or automotive under-hood use. | Choose MAX6008BAUT25+T only when fixed 2.5 V and superior initial accuracy outweigh adjustability and extended temperature needs. |
Compared with TL431BQDBZR, TL432BQDBZR offers identical regulation performance but requires different PCB routing due to pinout reversal; versus MAX6008BAUT25+T, it trades fixed-voltage precision for wide-range adjustability and full automotive temperature support.
Availability
TL432BQDBZR 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 TL432BQDBZR 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 feedback loops of isolated power supplies, offering programmable shunt reference functionality with automotive-grade reliability and tight initial tolerances.
FAQ
What is the reference voltage tolerance of TL432BQDBZR at 25°C?
The TL432BQDBZR has a reference voltage tolerance of ±0.5% at 25°C, corresponding to a nominal Vref range of 2.483 V to 2.507 V. This B-grade accuracy is specified in Section 6.13 of the TI SLVS543S datasheet and applies exclusively to the TL432BQDBZR variant with Q-temp qualification. The tolerance remains stable across its full −40°C to +125°C operating range, making TL432BQDBZR suitable for high-precision feedback in automotive and industrial applications.
How does the TL432BQDBZR pinout differ from TL431BQDBZR?
The TL432BQDBZR uses a CATHODE–REF–ANODE pinout (Pin 1–2–3) in the SOT-23-3 package, whereas TL431BQDBZR uses REF–CATHODE–ANODE. This reversal means TL432BQDBZR is not pin-compatible with TL431BQDBZR despite identical electrical specifications and Q-temp rating. Layout redesign is required when substituting TL432BQDBZR for TL431BQDBZR, as confirmed in TI's Pin Configuration and Functions section (Figure 5-1, TL432 DBZ top view).
What is the maximum reference voltage deviation over temperature for TL432BQDBZR?
The TL432BQDBZR exhibits a maximum reference voltage deviation of 14 mV over its full −40°C to +125°C operating temperature range, as specified in Section 6.13 (VI(dev)) of the TI SLVS543S datasheet. This value applies to all TL432BQ variants including TL432BQDBZR and reflects the difference between highest and lowest measured Vref across temperature - critical for maintaining output accuracy in servo drives and AC inverters exposed to thermal cycling.
Can TL432BQDBZR replace a Zener diode in voltage regulation circuits?
Yes, TL432BQDBZR is explicitly designed as a precision replacement for Zener diodes in shunt regulation applications. Its active output circuitry provides sharper turn-on characteristics, 0.2 Ω dynamic impedance (vs typical Zener impedance >10 Ω), and 0.5% initial tolerance (vs Zener tolerances ≥5%). Per TI's Description section, TL432BQDBZR excels in on-board regulation, adjustable power supplies, and switching power supplies where Zener limitations in accuracy, temperature drift, and dynamic response are unacceptable.
What is the minimum cathode current required for regulation in TL432BQDBZR?
The TL432BQDBZR requires a minimum cathode current of 0.4 mA to maintain regulation, with a typical value of 0.7 mA across temperature, as specified in Section 6.13 (Imin) of the TI SLVS543S datasheet. This parameter defines the lowest usable current in feedback networks - for example, when driving an optocoupler LED with 1 mA forward current, TL432BQDBZR remains fully functional well above its regulation threshold.
TL432BQDBZR 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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
TL432BQDBZR FAQ
1.How can I place an order for TL432BQDBZR through Aetrix?
Please submit a Request for Quotation (RFQ) for TL432BQDBZR 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 TL432BQDBZR reliable?
The price and inventory of TL432BQDBZR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL432BQDBZR is usually 5 days.
3.What payment methods are accepted for TL432BQDBZR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL432BQDBZR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL432BQDBZR?
TL432BQDBZR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL432BQDBZR 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 TL432BQDBZR?
For technical support, including TL432BQDBZR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL432BQDBZR requirements.
6.How does Aetrix verify that TL432BQDBZR is sourced from the original manufacturer or authorized distributors?
All TL432BQDBZR 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 TL432BQDBZR meets industry standards.
7.What is the process for return or replacement of TL432BQDBZR?
All TL432BQDBZR units undergo pre-shipment inspection (PSI). If there is an issue with TL432BQDBZR, 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 TL432BQDBZR part is unused and in its original packaging.
Return procedure for TL432BQDBZR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL432BQDBZR Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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AN431AN-ATRG1
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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
Diodes Incorporated
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
Texas Instruments
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
Texas Instruments
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AZ431LANTR-G1
Diodes Incorporated
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