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Texas Instruments TL432LIBIDBZR
- Part No.:
- TL432LIBIDBZR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL432LIBIDBZR.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:11,033
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Product details
Overview
TL432LIBIDBZR from Texas Instruments is a precision programmable shunt regulator in SOT-23 (DBZ) package, functioning as a 2.495 V reference with 0.5% initial tolerance at 25°C, adjustable output voltage from 2.495 V to 36 V, 0.3 Ω typical dynamic impedance, and −40°C to +125°C operation (Q-temp grade). It replaces Zener diodes in secondary-side regulation of flyback SMPS.
For engineers reviewing the TL432LIBIDBZR datasheet, TL432LIBIDBZR pinout, TL432LIBIDBZR application, or TL432LIBIDBZR equivalent, key selection considerations include reference accuracy, cathode current range (1–15 mA), temperature drift (10 mV over −40°C to +125°C), low reference input current (0.4 µA max), and DBZ-package pin compatibility with TL431LI variants.
Technical Context
The TL432LIBIDBZR implements a three-terminal shunt regulator architecture with an internal 2.495 V bandgap reference and high-gain op-amp driving a Darlington sink output stage. Its closed-loop operation relies on resistive feedback between cathode and reference pins to set regulated voltage.
It operates in two primary functional modes: open-loop comparator mode (with integrated reference) and closed-loop shunt regulation mode. Unlike linear regulators, it requires no external compensation capacitor for stability but exhibits defined stability boundaries dependent on load capacitance and cathode voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage (VREF) | 2.495 V ±0.5% at 25°C - sets precise regulation threshold for feedback networks |
| Adjustable Output Range | 2.495 V to 36 V - enables wide-range voltage referencing using two external resistors |
| Cathode Current (IK) | 1 mA to 15 mA - minimum current required for regulation; maximum sink capability defines power handling |
| Dynamic Impedance (|ZKA|) | 0.3 Ω typical - ensures tight voltage regulation under varying load conditions |
| Reference Input Current (IREF) | 0.4 µA max - minimizes resistor-divider error and leakage impact in precision designs |
| Temp Drift (VI(dev)) | 10 mV over −40°C to +125°C - guarantees stable reference performance across automotive-grade thermal range |
| Operating Temperature | −40°C to +125°C - qualified for Q-temp industrial and automotive applications requiring extended reliability |
Pinout & Package
TL432LIBIDBZR is housed in a 3-pin SOT-23 (DBZ) package measuring 2.90 mm × 1.30 mm, optimized for space-constrained PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE (Pin 2) | Shunt current/voltage node | Main output terminal; sinks current to regulate voltage; connects to feedback network and load |
| REF (Pin 1) | Reference input | Senses voltage divider output; must be driven with ≤0.4 µA to maintain accuracy; not floating |
| ANODE (Pin 3) | Common return | Typically connected to system ground; serves as reference point for all voltages and currents |
Key Features
| Feature | Design Value |
|---|---|
| 0.5% reference accuracy (B grade) | Enables high-precision voltage setting without trimming; reduces calibration overhead in production |
| Optimized IREF and II(dev) | 0.4 µA max IREF, 0.3 µA max deviation over temperature - improves divider accuracy and system stability |
| Pin-to-pin alternative to TL431LI (DBZ) | Different pinout (REF/CATHODE swapped) - allows layout reuse with minor routing adjustment in TL431LI designs |
| Stable without output capacitor | Internally compensated - eliminates need for external capacitor in most configurations, reducing BOM count |
| 15 mA max cathode sink current | Supports direct regulation of moderate-power loads or drives optocoupler LEDs in isolated SMPS feedback paths |
Applications
| Secondary-Side Regulation in Flyback SMPS | Zener Diode Replacement |
|---|---|
Use Scenario: Used in isolated flyback converters to sense and regulate output voltage via optocoupler feedback loop. IC Role / Device Role / Timing Role: Precision shunt regulator providing accurate voltage reference for error amplifier in secondary-side control circuit. Use Value: Enables ±1% output regulation over line/load/temperature; replaces discrete Zener + transistor with single IC and tighter tolerance. | Use Scenario: Replaces standard Zener diodes in onboard voltage clamping, overvoltage protection, and reference generation circuits. IC Role / Device Role / Timing Role: Adjustable shunt regulator acting as programmable voltage clamp with sharp turn-on characteristic. Use Value: Delivers 0.5% initial accuracy vs. typical Zener 5–10% tolerance; reduces board area and improves long-term stability. |
| Voltage Monitoring | Precision Constant Current Sink |
Use Scenario: Monitors battery or rail voltage in automotive body control modules and industrial sensors. IC Role / Device Role / Timing Role: Comparator with integrated 2.495 V reference detecting over/under-voltage thresholds. Use Value: Eliminates external reference IC; supports fast response with ≥1 mA cathode current and <10% overdrive margin. | Use Scenario: Provides stable current source for LED drivers, sensor biasing, and analog front-end calibration circuits. IC Role / Device Role / Timing Role: Reference-controlled current sink where output current = VREF/RS. Use Value: Achieves <1% current accuracy using 0.5% TL432LIBIDBZR and 0.1% sense resistor; supports 100 mA+ loads with external pass device. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431LIBIDBZR | Same electrical specs, identical B-grade accuracy and Q-temp rating, but REF and CATHODE pins swapped in DBZ package | Requires PCB layout revision to swap REF/CATHODE connections; otherwise drop-in in function and performance | Select when migrating from TL431LI-based designs and layout modification is acceptable |
| TL432ACDCKR | A-grade (1% initial accuracy), same DBZ package, C-temp (0°C to 70°C) rating, higher IREF (1 µA max) | Suitable for commercial-grade cost-sensitive applications; lower accuracy and narrower temp range limit automotive/industrial use | Select for non-critical consumer applications where 1% tolerance and 0–70°C operation suffice |
Compared with TL431LIBIDBZR, TL432LIBIDBZR offers identical performance with a pinout optimized for new designs avoiding legacy TL431LI layout constraints; versus TL432ACDCKR, it delivers tighter 0.5% accuracy and extended −40°C to +125°C operation essential for automotive and industrial systems.
Availability
TL432LIBIDBZR is available at Aetrix Electronics and suitable for secondary-side regulation in flyback SMPS, precision current sinking in LED drivers, and voltage monitoring in automotive control units requiring stable component supply and long-term lifecycle support.
Supply support for TL432LIBIDBZR 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 for industrial, automotive, and communications markets.
The TL43xLI family-including TL432LIBIDBZR-is designed for precision voltage referencing and shunt regulation in safety-critical power management and feedback control systems.
FAQ
What is the reference voltage tolerance of TL432LIBIDBZR at 25°C?
The TL432LIBIDBZR has a reference voltage tolerance of ±0.5% at 25°C, corresponding to a 2.495 V nominal output with a range of 2.483 V to 2.507 V. This B-grade accuracy is specified in the Electrical Characteristics table of the SLVSDQ6A datasheet and applies across the full operating temperature range when combined with its 10 mV total drift specification.
How does TL432LIBIDBZR differ from TL431LIBIDBZR?
TL432LIBIDBZR and TL431LIBIDBZR share identical electrical specifications, accuracy, temperature rating, and package-but differ in pinout: TL432LIBIDBZR places REF on Pin 1 and CATHODE on Pin 2, while TL431LIBIDBZR reverses them. This makes TL432LIBIDBZR a functional alternative requiring only PCB trace adjustments, not redesign.
What is the minimum cathode current required for regulation in TL432LIBIDBZR?
The TL432LIBIDBZR requires a minimum cathode current (IK) of 1 mA to maintain regulation, as specified in the Recommended Operating Conditions section. Below this threshold, gain drops significantly, leading to poor regulation and slow response-especially critical in comparator or optocoupler-driven feedback applications.
Can TL432LIBIDBZR operate without an external output capacitor?
Yes, TL432LIBIDBZR is internally compensated and stable without an external output capacitor between cathode and anode under most conditions. However, Figure 12 in the SLVSDQ6A datasheet defines stability boundaries: adding >1 µF capacitance may cause oscillation unless cathode voltage and load conditions fall within the stable region.
What is the maximum operating temperature range for TL432LIBIDBZR?
TL432LIBIDBZR is rated for operation from −40°C to +125°C (Q-temp grade), as confirmed in the Device Comparison Table and Recommended Operating Conditions sections of the SLVSDQ6A datasheet. This makes it suitable for under-hood automotive, industrial motor control, and high-reliability embedded applications.
TL432LIBIDBZR 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
TL432LIBIDBZR FAQ
1.How can I place an order for TL432LIBIDBZR through Aetrix?
Please submit a Request for Quotation (RFQ) for TL432LIBIDBZR 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 TL432LIBIDBZR reliable?
The price and inventory of TL432LIBIDBZR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL432LIBIDBZR is usually 5 days.
3.What payment methods are accepted for TL432LIBIDBZR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL432LIBIDBZR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL432LIBIDBZR?
TL432LIBIDBZR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL432LIBIDBZR 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 TL432LIBIDBZR?
For technical support, including TL432LIBIDBZR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL432LIBIDBZR requirements.
6.How does Aetrix verify that TL432LIBIDBZR is sourced from the original manufacturer or authorized distributors?
All TL432LIBIDBZR 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 TL432LIBIDBZR meets industry standards.
7.What is the process for return or replacement of TL432LIBIDBZR?
All TL432LIBIDBZR units undergo pre-shipment inspection (PSI). If there is an issue with TL432LIBIDBZR, 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 TL432LIBIDBZR part is unused and in its original packaging.
Return procedure for TL432LIBIDBZR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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