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Texas Instruments TL432LIBQDBZR
- Part No.:
- TL432LIBQDBZR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL432LIBQDBZR.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,625
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Product details
Overview
TL432LIBQDBZR from Texas Instruments is a precision programmable shunt regulator in SOT-23 (DBZ) package, functioning as an adjustable voltage reference or error amplifier with 0.5% initial reference voltage tolerance at 25°C, 2.495 V nominal Vref, and operation across −40°C to +125°C. It sinks up to 15 mA cathode current, features 0.3 Ω typical dynamic impedance, and replaces Zener diodes in secondary-side regulation of flyback SMPS.
For engineers reviewing the TL432LIBQDBZR datasheet, TL432LIBQDBZR pinout, TL432LIBQDBZR application, or TL432LIBQDBZR equivalent, key selection considerations include its Q-temp automotive-grade temperature range, optimized 0.4 µA max reference input current, pinout-differentiated identity versus TL431LI, and use as a comparator with integrated reference in voltage monitoring circuits.
Technical Context
The TL432LIBQDBZR implements a three-terminal shunt architecture with an internal 2.495 V bandgap reference and high-gain op-amp driving a Darlington output stage. Its closed-loop operation enables precise voltage regulation from Vref to 36 V using two external resistors, while open-loop mode supports comparator functionality with built-in reference.
It delivers 10 mV max reference voltage drift over −40°C to +125°C (Q-temp grade), maintains 1 mA minimum cathode current for regulation, and achieves 0.3 Ω typical dynamic impedance - enabling stable performance without mandatory output capacitance, unlike many linear regulators.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Vref Tolerance (25°C) | ±0.5% (B grade) - ensures tight initial accuracy for high-precision feedback loops |
| Reference Voltage | 2.495 V (typical) - sets baseline for adjustable output from 2.495 V to 36 V |
| Operating Temperature | −40°C to +125°C (Q grade) - qualified for automotive under-hood and industrial harsh environments |
| IREF (max) | 0.4 µA - low input bias enables high-impedance sensing and minimal loading on divider networks |
| IKA Range | 1 mA to 15 mA - defines usable sink-current window for regulation and comparator modes |
| Dynamic Impedance | 0.3 Ω (typical) - ensures minimal output voltage variation under load transients |
| VKA Max | 36 V - supports wide-input-voltage applications including 24 V industrial rails and telecom systems |
Pinout & Package
TL432LIBQDBZR is housed in a 3-pin SOT-23 (DBZ) package measuring 2.90 mm × 1.30 mm, optimized for space-constrained PCB layouts in automotive and industrial power supplies.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE (Pin 2) | Shunt current output / voltage sense node | Primary current-sink terminal; connects to regulated rail or optocoupler LED anode in SMPS feedback |
| REF (Pin 1) | Reference input / threshold sensing node | High-impedance input comparing external voltage to internal 2.495 V reference; requires ≤0.4 µA bias |
| ANODE (Pin 3) | Common return / ground reference | Low-impedance return path for cathode current; must be connected to system ground or lowest potential point |
Key Features
| Feature | Design Value |
|---|---|
| Optimized IREF and II(dev) | 0.4 µA max IREF and 0.3 µA max deviation enable higher system accuracy and lower leakage vs legacy TL431 |
| Q-temp qualification | −40°C to +125°C operation meets AEC-Q100 stress test requirements for automotive powertrain and body electronics |
| Pinout differentiation from TL431LI | REF and CATHODE pins swapped in DBZ package - prevents accidental substitution and mandates layout verification |
| Internal compensation | Stable without output capacitor - simplifies design and reduces BOM count in cost-sensitive applications |
| Sharp turn-on characteristic | Enables fast response in overvoltage detection and precision current sinking, critical for safety-critical monitoring |
Applications
| Secondary-Side Regulation in Flyback SMPS | Zener Diode Replacement |
|---|---|
Use Scenario: Used in isolated DC/DC converters to regulate output voltage via optocoupler feedback loop. IC Role / Device Role / Timing Role: Shunt regulator providing precise 2.495 V reference to drive optocoupler LED; error amplifier comparing sampled output to internal reference. Use Value: Enables ±0.5% output regulation accuracy over temperature and line, replacing discrete Zener + transistor solutions with single-component reliability. | Use Scenario: Replaces 2.4–3.6 V Zener diodes in onboard voltage clamping and reference generation. IC Role / Device Role / Timing Role: Adjustable shunt element with sharp knee and low dynamic impedance, acting as programmable voltage clamp. Use Value: Delivers 0.3 Ω impedance and 0.5% tolerance - significantly tighter regulation and lower temperature drift than standard Zeners. |
| Voltage Monitoring | Precision Constant Current Sink |
Use Scenario: Detects overvoltage conditions in battery management or power supply supervision circuits. IC Role / Device Role / Timing Role: Comparator with integrated 2.495 V reference; REF pin compares monitored voltage, CATHODE outputs logic-level signal. Use Value: Eliminates need for external reference IC; 0.4 µA IREF allows high-resistor-divider sensing with minimal power loss. | Use Scenario: Provides stable 100 mA LED drive or sensor bias current in automotive lighting or industrial sensors. IC Role / Device Role / Timing Role: Error amplifier controlling external pass transistor (e.g., PNP or PMOS) to maintain constant current through sense resistor. Use Value: Achieves current accuracy determined by 0.5% Vref tolerance and matched resistor - superior to op-amp-based sinks lacking integrated reference. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431LIBQDBZR | Identical electrical specs but TL431LI pinout (REF = Pin 2, CATHODE = Pin 1) | Requires PCB layout change; not drop-in compatible due to swapped REF/CATHODE pins | Select only when redesigning for legacy TL431 footprint or reusing existing TL431LI layout |
| TL432ACQDBZR | 1% initial Vref tolerance (A grade) instead of 0.5% (B grade); otherwise identical Q-temp spec | Suitable where ±1% accuracy suffices - e.g., non-critical biasing or coarse monitoring | Choose for cost-sensitive designs accepting relaxed reference accuracy without sacrificing temperature range or package |
Compared with TL431LIBQDBZR, TL432LIBQDBZR avoids layout errors in new designs by enforcing correct pin mapping for REF-driven topologies; versus TL432ACQDBZR, it delivers tighter regulation essential for precision feedback in automotive SMPS and battery protection.
Availability
TL432LIBQDBZR is available at Aetrix Electronics and suitable for automotive powertrain control units, industrial flyback converters, and precision voltage monitoring systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TL432LIBQDBZR 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 delivering analog and embedded processing solutions, with leadership in power management, signal chain, and high-reliability components.
The TL43xLI family was designed specifically for precision shunt regulation and reference applications in automotive, industrial, and computing systems - emphasizing low drift, high accuracy, and robust thermal performance.
FAQ
What is the primary function of the TL432LIBQDBZR?
The TL432LIBQDBZR is a programmable shunt regulator that functions as an adjustable voltage reference or error amplifier. It maintains a precise 2.495 V reference internally and regulates output voltage from 2.495 V to 36 V using external resistors. Its core role is to provide accurate, temperature-stable feedback in power supplies, voltage monitors, and current sinks - with the TL432LIBQDBZR specifically optimized for automotive-grade operation from −40°C to +125°C.
How does the TL432LIBQDBZR differ from the TL431LI in the same DBZ package?
The TL432LIBQDBZR and TL431LIBQDBZR share identical electrical specifications and Q-temp rating, but feature swapped pin assignments in the SOT-23 (DBZ) package: TL432LIBQDBZR has REF on Pin 1 and CATHODE on Pin 2, whereas TL431LIBQDBZR places CATHODE on Pin 1 and REF on Pin 2. This intentional pinout difference prevents inadvertent substitution and requires dedicated PCB layout - TL432LIBQDBZR is not pin-compatible with TL431LI despite identical packaging and performance.
What is the minimum cathode current required for regulation in TL432LIBQDBZR?
The TL432LIBQDBZR requires a minimum cathode current (IKA) of 1 mA to maintain regulation, as specified in its recommended operating conditions. Below this threshold, the device may exit its active region, resulting in degraded accuracy, increased output impedance, or failure to regulate. Designers must ensure the external bias network supplies ≥1 mA continuously - especially under light-load or standby conditions - to guarantee stable 2.495 V reference behavior across the full −40°C to +125°C temperature range.
Can TL432LIBQDBZR operate without an output capacitor?
Yes, the TL432LIBQDBZR is internally compensated and stable without an output capacitor between CATHODE and ANODE - a key advantage over many linear regulators. This eliminates BOM cost and board space in simple shunt or reference applications. However, if an output capacitor is added (e.g., for noise filtering or transient suppression), stability must be verified per Figure 12 in the datasheet, as improper capacitance values can induce oscillation depending on VKA and IKA operating points.
What does the 'B' and 'Q' in TL432LIBQDBZR signify?
In TL432LIBQDBZR, 'B' denotes the 0.5% initial reference voltage tolerance grade at 25°C, while 'Q' indicates qualification for the extended automotive temperature range of −40°C to +125°C. The 'DBZR' suffix specifies the 3-pin SOT-23 package (DBZ) with tape-and-reel packaging (R). Together, TL432LIBQDBZR identifies a B-grade, Q-temp qualified, DBZ-packaged variant of the TL432LI shunt regulator - distinct from A-grade (1% tolerance) or I-temp (−40°C to +85°C) versions.
TL432LIBQDBZR 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:
- 15 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
TL432LIBQDBZR FAQ
1.How can I place an order for TL432LIBQDBZR through Aetrix?
Please submit a Request for Quotation (RFQ) for TL432LIBQDBZR 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 TL432LIBQDBZR reliable?
The price and inventory of TL432LIBQDBZR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL432LIBQDBZR is usually 5 days.
3.What payment methods are accepted for TL432LIBQDBZR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL432LIBQDBZR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL432LIBQDBZR?
TL432LIBQDBZR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL432LIBQDBZR 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 TL432LIBQDBZR?
For technical support, including TL432LIBQDBZR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL432LIBQDBZR requirements.
6.How does Aetrix verify that TL432LIBQDBZR is sourced from the original manufacturer or authorized distributors?
All TL432LIBQDBZR 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 TL432LIBQDBZR meets industry standards.
7.What is the process for return or replacement of TL432LIBQDBZR?
All TL432LIBQDBZR units undergo pre-shipment inspection (PSI). If there is an issue with TL432LIBQDBZR, 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 TL432LIBQDBZR part is unused and in its original packaging.
Return procedure for TL432LIBQDBZR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL432LIBQDBZR Tags
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LM4040DIM3X-2.5/NOPB
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AZ431LANTR-G1
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