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Texas Instruments TL432LIBEDBZRQ1
- Part No.:
- TL432LIBEDBZRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL432LIBEDBZRQ1.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:7,054
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Product details
Overview
TL432LIBEDBZRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-grade programmable shunt regulator in SOT-23 (DBZ) package, featuring 0.5% reference voltage tolerance at 25°C, 2.495 V nominal Vref, 0.3 Ω typical dynamic impedance, and sink-current capability up to 15 mA. It serves as a precision voltage reference and error amplifier in feedback loops of DC/DC converters and LED current sinks.
For engineers reviewing the TL432LIBEDBZRQ1 datasheet, TL432LIBEDBZRQ1 pinout, TL432LIBEDBZRQ1 application, or TL432LIBEDBZRQ1 equivalent, key selection considerations include its optimized IREF (≤0.4 µA) and II(dev) (≤0.3 µA) for high-accuracy regulation, grade-1 temperature range (–40°C to +125°C), and DBZ-package pinout distinct from TL431LI-Q1.
Technical Context
The TL432LIBEDBZRQ1 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 adjustable output voltage from Vref to 36 V using two external resistors, while open-loop mode supports comparator functionality with integrated reference.
It delivers stable regulation without mandatory output capacitance due to internal compensation, supports cathode currents from 0.6 mA to 15 mA, and maintains ≤27 mV reference voltage drift over –40°C to +125°C ambient - meeting stringent automotive thermal stability requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Vref (25°C) | 2.495 V ±0.5% - sets precise regulation threshold; enables 0.5% system-level voltage accuracy in feedback networks. |
| VKA Range | 2.495 V to 36 V - supports wide-range adjustable shunt regulation without external reference components. |
| IKA Max | 15 mA - defines maximum sink current capacity; determines power dissipation limit and external pass device sizing. |
| IREF Max | 0.4 µA - ultra-low reference input current minimizes resistor-divider loading error in precision voltage-setting networks. |
| |ZKA| Typ | 0.3 Ω - low dynamic impedance ensures minimal output voltage variation under load transients. |
| VI(dev) | ≤27 mV (–40°C to +125°C) - quantifies total reference voltage deviation across automotive grade-1 temperature range. |
| Imin | 0.6 mA - minimum cathode current required to maintain regulation; dictates bias network design margin. |
Pinout & Package
SOT-23 (DBZ) package, 2.90 mm × 1.30 mm body size, surface-mount, 3-pin configuration.
| 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 isolated feedback designs. |
| 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 current. |
| ANODE (Pin 3) | Common return / ground reference | Low-impedance return path for cathode current; must be connected directly to system ground or common reference plane. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation; suitable for engine control, transmission, and ADAS subsystems. |
| Optimized IREF and II(dev) | 0.4 µA max IREF and 0.3 µA max II(dev) reduce resistor-divider error and improve system accuracy vs. legacy TL431-Q1. |
| Pin-to-pin compatible alternative to TL431LI-Q1 (DBZ) | Different pinout (REF/CATHODE swapped) enables layout reuse with minor trace re-routing; avoids redesign of existing SOT-23 footprints. |
| Internal compensation | Stable operation without mandatory cathode-to-anode capacitor; simplifies BOM and improves reliability in space-constrained automotive modules. |
| Sharp turn-on characteristic | Enables fast response in overvoltage protection and precision comparator applications, with <1 µs propagation delay under 1 mA cathode load. |
Applications
| DC/DC Converter Feedback | Automotive LED Current Sink |
|---|---|
Use Scenario: Regulating output voltage of isolated flyback or forward converter via optocoupler feedback loop. IC Role / Device Role / Timing Role: Precision shunt reference and error amplifier; compares sampled output voltage to 2.495 V internal reference and modulates optocoupler LED current. Use Value: Enables ±0.5% output voltage accuracy over temperature and line/load variations, critical for ECU power rail stability. | Use Scenario: Driving high-brightness LEDs in headlamp or interior lighting with constant current control. IC Role / Device Role / Timing Role: Voltage-controlled current sink; regulates sense resistor voltage to 2.495 V, setting LED current independent of supply fluctuations. Use Value: Maintains consistent LED brightness and color point across –40°C to +125°C, satisfying automotive photometric requirements. |
| On-Board Charger (OBC) Monitoring | Engine Management Actuator Control |
Use Scenario: Monitoring battery voltage thresholds and triggering charge-state transitions in 400 V OBC systems. IC Role / Device Role / Timing Role: Precision comparator with integrated reference; detects VBAT crossing 2.495 V × (R1+R2)/R2 to signal state changes. Use Value: Eliminates external reference IC, reducing component count and improving thermal tracking in high-voltage battery management circuits. | Use Scenario: Providing accurate voltage clamping and fault detection for solenoid driver outputs in engine valve control. IC Role / Device Role / Timing Role: Adjustable shunt clamp; limits actuator drive voltage to safe levels during transient events or short-circuit conditions. Use Value: Prevents solenoid coil overvoltage damage while maintaining fast response (<10 µs) to protect against ESD and load dump pulses. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431LIBEDBZRQ1 | Identical electrical specs and thermal performance, but REF and CATHODE pins swapped in DBZ package (Pin 1 = ANODE, Pin 2 = REF, Pin 3 = CATHODE). | Requires PCB trace revision to match pinout; not drop-in replaceable without layout change. | Select when reusing TL431LI-Q1 reference designs with minimal routing modifications. |
| TL432ACDBZR | Commercial-grade (non-automotive), same DBZ pinout, 2% initial Vref tolerance, no AEC-Q100 qualification. | Not qualified for automotive safety-critical systems; limited to infotainment or non-safety accessories. | Select for cost-sensitive non-automotive applications where AEC-Q100 is not mandated. |
Compared with TL431LIBEDBZRQ1, TL432LIBEDBZRQ1 offers identical performance in a pinout-optimized package for new designs, while TL432ACDBZR provides lower-cost commercial-grade functionality without automotive qualification - requiring careful system-level validation for safety-relevant use.
Availability
TL432LIBEDBZRQ1 is available at Aetrix Electronics and suitable for automotive power conversion, LED lighting, on-board charger monitoring, and engine management actuator control requiring stable component supply across extended temperature ranges.
Supply support for TL432LIBEDBZRQ1 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 automotive, industrial, and power management solutions.
The TL43xLI-Q1 product line delivers AEC-Q100-qualified programmable shunt regulators optimized for high-accuracy voltage reference, error amplification, and comparator functions in automotive power systems.
FAQ
What is the reference voltage tolerance of TL432LIBEDBZRQ1 at 25°C?
The TL432LIBEDBZRQ1 has a reference voltage tolerance of ±0.5% at 25°C, corresponding to a nominal Vref of 2.495 V with a range of 2.483 V to 2.507 V. This B-grade accuracy is specified per the TI SNVSBA4A datasheet and applies across the full operating temperature range when combined with its ≤27 mV VI(dev) specification. TL432LIBEDBZRQ1 achieves this tighter tolerance through laser trimming during manufacturing.
How does the TL432LIBEDBZRQ1 pinout differ from TL431LI-Q1 in the DBZ package?
The TL432LIBEDBZRQ1 uses a reversed pinout versus TL431LI-Q1 in the SOT-23 (DBZ) package: TL432LIBEDBZRQ1 assigns Pin 1 to REF, Pin 2 to CATHODE, and Pin 3 to ANODE, whereas TL431LI-Q1 uses Pin 1 for CATHODE, Pin 2 for REF, and Pin 3 for ANODE. This difference requires trace re-routing on PCBs designed for TL431LI-Q1, though both share identical electrical behavior and thermal specifications.
What is the minimum cathode current required for regulation in TL432LIBEDBZRQ1?
The TL432LIBEDBZRQ1 requires a minimum cathode current (Imin) of 0.6 mA to maintain regulation, as specified in the Recommended Operating Conditions table of the SNVSBA4A datasheet. Below this threshold, the device exits linear regulation and exhibits reduced gain and increased output impedance. Designers must ensure bias networks deliver ≥0.6 mA under worst-case conditions including low temperature and high Vref tolerance.
Can TL432LIBEDBZRQ1 operate without an output capacitor?
Yes, TL432LIBEDBZRQ1 is internally compensated and stable without an output capacitor between CATHODE and ANODE, unlike many linear regulators. This eliminates capacitor-related failure modes and reduces BOM count in space-constrained automotive modules. However, if an output capacitor is added for noise filtering, Figure 12 in the SNVSBA4A datasheet provides stability boundary guidance to avoid oscillation.
Is TL432LIBEDBZRQ1 qualified for automotive safety-critical applications?
TL432LIBEDBZRQ1 is AEC-Q100 qualified for Grade 1 (–40°C to +125°C ambient), but it is not ISO 26262 ASIL-certified. It is suitable for automotive applications such as DC/DC converters, LED lighting, and OBC monitoring where functional safety requirements are met through system-level redundancy or architectural measures - not through component-level ASIL rating. Always validate final implementation per vehicle OEM safety requirements.
TL432LIBEDBZRQ1 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 ~ 150°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
TL432LIBEDBZRQ1 FAQ
1.How can I place an order for TL432LIBEDBZRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL432LIBEDBZRQ1 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 TL432LIBEDBZRQ1 reliable?
The price and inventory of TL432LIBEDBZRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL432LIBEDBZRQ1 is usually 5 days.
3.What payment methods are accepted for TL432LIBEDBZRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL432LIBEDBZRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL432LIBEDBZRQ1?
TL432LIBEDBZRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL432LIBEDBZRQ1 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 TL432LIBEDBZRQ1?
For technical support, including TL432LIBEDBZRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL432LIBEDBZRQ1 requirements.
6.How does Aetrix verify that TL432LIBEDBZRQ1 is sourced from the original manufacturer or authorized distributors?
All TL432LIBEDBZRQ1 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 TL432LIBEDBZRQ1 meets industry standards.
7.What is the process for return or replacement of TL432LIBEDBZRQ1?
All TL432LIBEDBZRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TL432LIBEDBZRQ1, 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 TL432LIBEDBZRQ1 part is unused and in its original packaging.
Return procedure for TL432LIBEDBZRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL432LIBEDBZRQ1 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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