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Texas Instruments TL432LIAQDBZRQ1
- Part No.:
- TL432LIAQDBZRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL432LIAQDBZRQ1.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:642
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Product details
Overview
TL432LIAQDBZRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified 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 - used for precision voltage regulation and error amplification in DC/DC converters and on-board chargers.
For engineers reviewing the TL432LIAQDBZRQ1 datasheet, TL432LIAQDBZRQ1 pinout, TL432LIAQDBZRQ1 application, or TL432LIAQDBZRQ1 equivalent, key selection considerations include its optimized reference input current (IREF ≤ 0.4 µA), low temperature drift (≤27 mV over –40°C to +125°C), pin-specific DBZ pinout (REF–CATHODE–ANODE), and functional equivalence with TL431LI-Q1 except for terminal assignment.
Technical Context
The TL432LIAQDBZRQ1 implements a three-terminal shunt regulator architecture with an internal 2.495 V bandgap reference and high-gain op-amp driving a Darlington output stage. It operates in closed-loop regulation when feedback is applied between CATHODE and REF, or as an open-loop comparator with integrated reference when unconnected.
Its design enables stable operation without external compensation capacitors across the full automotive temperature range (–40°C to +125°C), with cathode voltage adjustable from Vref to 36 V using two external resistors and minimum regulation current of 0.6 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Vref (25°C) | 2.495 V ±0.5% - sets precise regulation threshold; enables accurate voltage setting from 2.495 V to 36 V with resistor divider |
| Temperature Drift (VI(dev)) | ≤27 mV over –40°C to +125°C - ensures stable reference under automotive thermal stress |
| IREF (max) | 0.4 µA - minimizes loading error on feedback network; supports high-impedance resistor dividers |
| IKA (max) | 15 mA - defines maximum shunt current capacity; determines power dissipation limit in regulation mode |
| |ZKA| (dynamic impedance) | 0.3 Ω typical - provides sharp turn-on and low output impedance for tight voltage regulation |
| Imin (regulation threshold) | 0.6 mA - minimum cathode current required to maintain regulation; critical for low-power standby designs |
| VKA (max) | 36 V - maximum cathode-to-anode operating voltage; defines upper limit of adjustable output range |
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 |
|---|---|---|
| Pin 1: CATHODE | Shunt current output / voltage sense node | Primary current-sink terminal; connects to regulated rail or optocoupler LED anode in feedback loops |
| Pin 2: REF | Reference input / threshold sensing node | High-impedance input comparing external voltage to internal 2.495 V reference; requires ≥0.4 µA bias |
| Pin 3: ANODE | Common return / ground reference | Low-impedance return path for cathode current and reference bias; must be connected to system ground or lowest potential point |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation - meets automotive reliability and lifetime requirements |
| Optimized IREF and II(dev) | IREF ≤ 0.4 µA, II(dev) ≤ 0.3 µA - reduces resistor-divider error and improves system accuracy vs. legacy TL431-Q1 |
| Pin-to-pin functional equivalence with TL431LI-Q1 | Same electrical specs and performance - allows design reuse with only PCB layout adjustment for DBZ pinout |
| Internal compensation | Stable without external capacitor - simplifies layout and eliminates stability risk from output capacitance |
| Sharp turn-on characteristic | 0.3 Ω dynamic impedance - enables fast transient response and replaces Zener diodes in precision regulation |
Applications
| DC/DC Converter Feedback | On-Board Charger (OBC) Regulation |
|---|---|
Use Scenario: Regulates isolated secondary-side output voltage via optocoupler feedback loop in flyback or forward converters. IC Role / Device Role / Timing Role: Precision shunt regulator acting as error amplifier - compares sampled output voltage against 2.495 V reference and adjusts optocoupler LED current. Use Value: Enables ±0.5% output voltage accuracy over temperature and line/load transients due to low drift and high PSRR. | Use Scenario: Provides stable reference and error amplification in bidirectional AC/DC and DC/DC stages of EV on-board chargers. IC Role / Device Role / Timing Role: Adjustable shunt regulator controlling gate driver bias or auxiliary supply regulation - referenced to battery or HV bus. Use Value: Supports AEC-Q100 Grade 1 compliance and maintains regulation integrity during thermal cycling and vibration stress. |
| LED Lighting Current Sink | Engine Management Actuator Control |
Use Scenario: Sets precise constant current for high-brightness automotive LED headlamps and DRLs using external MOSFET/BJT pass element. IC Role / Device Role / Timing Role: Reference-controlled current sink - senses voltage across sense resistor and regulates pass device conduction. Use Value: Delivers <±1% current accuracy over temperature via 0.5% Vref tolerance and ≤27 mV drift, ensuring consistent luminance and color. | Use Scenario: Monitors and regulates solenoid or valve coil current in engine control modules for fuel injectors or EGR actuators. IC Role / Device Role / Timing Role: Comparator with integrated reference - triggers actuator enable/disable based on sensed voltage thresholds. Use Value: Eliminates external reference IC; achieves fast, repeatable trip points with 0.4 µA IREF enabling high-resistance sensing networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431LIAQDBZRQ1 | Different DBZ pinout (REF–CATHODE–ANODE vs. CATHODE–REF–ANODE); identical electrical specs and thermal performance | Requires PCB layout revision; same functional behavior in all circuits | Select TL431LIAQDBZRQ1 only when reusing existing TL431-based layouts with matching pin assignment |
| TL432LIBQDBZRQ1 | 1% initial Vref tolerance (vs. 0.5% for TL432LIAQDBZRQ1); otherwise identical Grade 1 specs and DBZ pinout | Acceptable where ±1% output accuracy suffices; lower cost in high-volume production | Choose TL432LIBQDBZRQ1 for cost-sensitive non-critical regulation paths where 1% tolerance is sufficient |
Compared with TL432LIAQDBZRQ1, TL431LIAQDBZRQ1 demands board-level redesign due to reversed REF/CATHODE pins, while TL432LIBQDBZRQ1 trades 0.5% Vref accuracy for cost reduction - both retain AEC-Q100 Grade 1 qualification and identical thermal drift, dynamic impedance, and current capability.
Availability
TL432LIAQDBZRQ1 is available at Aetrix Electronics and suitable for automotive power conversion, on-board charging, and engine management systems requiring stable component supply with AEC-Q100 compliance and long-term lifecycle support.
Supply support for TL432LIAQDBZRQ1 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 automotive, industrial, and personal electronics markets.
The TL43xLI-Q1 product line delivers AEC-Q100-qualified shunt regulators optimized for high-accuracy voltage reference and error amplification in automotive power systems - designed specifically for DC/DC converters, OBCs, and actuator control.
FAQ
What is the pin configuration of TL432LIAQDBZRQ1 in the SOT-23 (DBZ) package?
The TL432LIAQDBZRQ1 uses a 3-pin SOT-23 (DBZ) package with Pin 1 = CATHODE, Pin 2 = REF, and Pin 3 = ANODE - distinct from TL431LI-Q1's CATHODE–REF–ANODE order. This pinout enables direct integration into feedback networks where REF must connect to the top of the resistor divider and CATHODE to the regulated rail.
How does TL432LIAQDBZRQ1 differ from TL431LI-Q1 electrically and mechanically?
TL432LIAQDBZRQ1 is functionally identical to TL431LI-Q1 in all electrical specifications - including 0.5% Vref tolerance, 27 mV temperature drift, 0.3 Ω dynamic impedance, and AEC-Q100 Grade 1 rating - but features a swapped REF/CATHODE pin assignment in the DBZ package. No electrical parameter differs; only PCB layout must be updated to accommodate the pinout change.
What is the minimum cathode current required for regulation in TL432LIAQDBZRQ1?
The TL432LIAQDBZRQ1 requires a minimum cathode current (Imin) of 0.6 mA to maintain regulation. Below this threshold, the internal amplifier exits linear operation, causing loss of reference tracking and increased output impedance. Designers must ensure external biasing supplies ≥0.6 mA under all operating conditions, including light-load and startup.
Can TL432LIAQDBZRQ1 operate without an output capacitor?
Yes, TL432LIAQDBZRQ1 is internally compensated and remains stable without an output capacitor between CATHODE and ANODE - a key advantage over many linear regulators. This simplifies layout and avoids stability risks from parasitic capacitance. If an output capacitor is added for noise filtering, Figure 12 in the datasheet provides stability boundary guidance for CL selection.
What automotive temperature grade does TL432LIAQDBZRQ1 support?
TL432LIAQDBZRQ1 is qualified to AEC-Q100 Grade 1, supporting continuous operation from –40°C to +125°C ambient temperature. Its reference voltage drift is specified at ≤27 mV across this full range, and it is characterized for reliable performance in engine bay, powertrain, and infotainment environments meeting automotive thermal stress requirements.
TL432LIAQDBZRQ1 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:
- ±1%
- 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
TL432LIAQDBZRQ1 FAQ
1.How can I place an order for TL432LIAQDBZRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL432LIAQDBZRQ1 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 TL432LIAQDBZRQ1 reliable?
The price and inventory of TL432LIAQDBZRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL432LIAQDBZRQ1 is usually 5 days.
3.What payment methods are accepted for TL432LIAQDBZRQ1?
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4.How is shipping managed for TL432LIAQDBZRQ1?
TL432LIAQDBZRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL432LIAQDBZRQ1 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 TL432LIAQDBZRQ1?
For technical support, including TL432LIAQDBZRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL432LIAQDBZRQ1 requirements.
6.How does Aetrix verify that TL432LIAQDBZRQ1 is sourced from the original manufacturer or authorized distributors?
All TL432LIAQDBZRQ1 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 TL432LIAQDBZRQ1 meets industry standards.
7.What is the process for return or replacement of TL432LIAQDBZRQ1?
All TL432LIAQDBZRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TL432LIAQDBZRQ1, 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 TL432LIAQDBZRQ1 part is unused and in its original packaging.
Return procedure for TL432LIAQDBZRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL432LIAQDBZRQ1 Tags
-
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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