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Texas Instruments TL432LIAEDBZRQ1
- Part No.:
- TL432LIAEDBZRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL432LIAEDBZRQ1.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,597
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Product details
Overview
TL432LIAEDBZRQ1 from Texas Instruments is an AEC-Q100 Grade 0 automotive-grade programmable shunt regulator in SOT-23 (DBZ) package, featuring 1% initial reference voltage tolerance at 25°C, 2.495 V nominal Vref, 34 mV max temperature drift over –40°C to +150°C, 0.3 Ω typical dynamic impedance, and 15 mA max cathode sink current - used for precision voltage regulation and error amplification in on-board chargers and powertrain control modules.
For engineers reviewing the TL432LIAEDBZRQ1 datasheet, TL432LIAEDBZRQ1 pinout, TL432LIAEDBZRQ1 application, or TL432LIAEDBZRQ1 equivalent, this page delivers verified electrical specs, validated DBZ pin mapping, automotive-grade thermal stability data, and real-world implementation guidance for DC/DC feedback loops, LED current sinks, and comparator-based monitoring circuits.
Technical Context
The TL432LIAEDBZRQ1 implements a precision bandgap reference and high-gain op-amp in a three-terminal shunt topology, enabling closed-loop regulation via external resistor dividers between cathode and reference pins. Its Darlington output stage delivers 15 mA sink capability with <0.3 Ω dynamic impedance at 1 mA–15 mA cathode current.
Unlike standard TL431 variants, the TL432LIAEDBZRQ1 uses inverted pinout (REF=Pin 1, CATHODE=Pin 2, ANODE=Pin 3) in the same SOT-23 (DBZ) package, while sharing identical electrical specifications - including 0.4 µA max reference input current, 0.3 µA max IREF deviation over temperature, and 0.6 mA minimum cathode current for regulation - with the TL431LI-Q1 family.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF | 2.495 V nominal (1% tolerance at 25°C); sets precise regulation threshold for feedback networks |
| VKA Range | 2.495 V to 36 V; enables wide-output adjustable shunt regulation without external reference |
| IKA Max | 15 mA; supports robust error-sink capability in optocoupler feedback and current-sense loops |
| Dynamic Impedance | 0.3 Ω typical; ensures minimal output voltage variation under load transients in closed-loop systems |
| Temp Drift (Grade 0) | 34 mV max over –40°C to +150°C; guarantees stable reference performance in engine bay and powertrain environments |
| IREF Max | 0.4 µA; reduces divider network loading error and enables high-resistance feedback design |
| IMIN | 0.6 mA; defines minimum cathode current required to maintain regulation and avoid dropout |
Pinout & Package
SOT-23 (DBZ) package: 2.90 mm × 1.30 mm body, 3-pin surface-mount, gull-wing leads, RoHS-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (REF) | Reference Input | High-impedance node sensing voltage divider output; must be driven with ≤0.4 µA to maintain accuracy |
| Pin 2 (CATHODE) | Current Sink Output | Active-low output terminal sinking up to 15 mA; connects to feedback node or optocoupler LED anode |
| Pin 3 (ANODE) | Common Return | Ground reference for internal reference and amplifier; ties to system ground or low-side return path |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 0 qualification | Validated for –40°C to +150°C ambient operation in safety-critical powertrain and charging systems |
| Inverted DBZ pinout vs TL431LI-Q1 | REF on Pin 1 / CATHODE on Pin 2 enables PCB layout optimization in space-constrained automotive modules |
| 0.4 µA max IREF | Reduces resistor-divider power loss and improves accuracy in high-impedance feedback networks |
| 0.3 Ω typical ZKA | Minimizes regulation error during fast load steps in switching converter feedback paths |
| No external compensation required | Internally compensated for stability with 0–10 µF output capacitance - simplifies layout in EMI-sensitive OBC designs |
Applications
| On-Board Charger (OBC) Feedback | LED Lighting Current Sink |
|---|---|
Use Scenario: Regulates isolated DC/DC output in 6.6 kW bidirectional OBC using optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Precision shunt regulator providing stable 2.495 V reference to drive optocoupler LED; acts as error amplifier comparing secondary-side voltage to setpoint. Use Value: Enables ±1% output voltage accuracy across –40°C to +125°C ambient, meeting ISO 15118 and SAE J1772 compliance requirements. |
Use Scenario: Controls constant current through high-brightness LEDs in adaptive front lighting systems (AFS). IC Role / Device Role / Timing Role: Reference-controlled current sink regulating LED string current via external sense resistor and pass transistor. Use Value: Delivers ±2% current accuracy over temperature with <1% reference drift contribution, ensuring consistent luminance and color point. |
| Engine Management Sensor Bias | Powertrain Exhaust Gas Sensor Interface |
Use Scenario: Supplies stable excitation voltage to resistive oxygen sensor (lambda probe) in exhaust manifold. IC Role / Device Role / Timing Role: Low-drift shunt reference generating precise bias for sensor bridge circuitry; operates in high-temperature zone near exhaust components. Use Value: Maintains <34 mV total VREF deviation from –40°C to +150°C, enabling accurate air-fuel ratio calculation under transient thermal conditions. |
Use Scenario: Provides regulated reference for NOx sensor signal conditioning in diesel aftertreatment systems. IC Role / Device Role / Timing Role: High-stability voltage reference feeding ADC input stage of exhaust gas sensor interface ASIC. Use Value: Eliminates need for external trimming; 1% initial tolerance and low tempco reduce calibration burden and improve long-term sensor drift performance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431LIAEDBZRQ1 | Same electrical specs and Grade 0 rating, but standard pinout (CATHODE=Pin 1, REF=Pin 2) | Requires PCB layout revision due to swapped REF/CATHODE pins; identical thermal and regulation performance | Select when reusing existing TL431-compatible layouts or when pin compatibility with legacy designs is mandatory |
| TLVH431AQDBVRQ1 | Lower 1.24 V reference, 2% initial tolerance, 50 µA max IREF, rated for –40°C to +125°C only | Better suited for low-voltage (<5 V) systems; not qualified for Grade 0 (150°C) environments | Choose for cost-sensitive 12 V battery rail applications where 150°C operation is unnecessary and lower VREF is advantageous |
Compared with TL431LIAEDBZRQ1, the TL432LIAEDBZRQ1 offers identical regulation accuracy and thermal stability but requires pinout-aware layout; versus TLVH431AQDBVRQ1, it provides higher temperature grade and tighter VREF tolerance at the cost of higher minimum operating voltage.
Availability
TL432LIAEDBZRQ1 is available at Aetrix Electronics and suitable for on-board chargers, powertrain exhaust sensors, and engine management actuators requiring stable component supply across automotive production lifecycles.
Supply support for TL432LIAEDBZRQ1 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-grade power management and precision analog solutions.
The TL43xLI-Q1 product line was designed specifically for automotive safety-critical voltage regulation, offering AEC-Q100 Grade 0/1 qualification, low-reference-current architecture, and optimized temperature stability for powertrain, charging, and lighting subsystems.
FAQ
What is the maximum cathode voltage rating for TL432LIAEDBZRQ1?
The absolute maximum cathode-to-anode voltage (VKA) for TL432LIAEDBZRQ1 is 37 V, with recommended operating range from VREF (2.495 V) up to 36 V. Exceeding 37 V risks permanent damage. This rating enables direct use in 24 V and 48 V automotive systems with margin, including OBC auxiliary supplies and high-side sensor interfaces where TL432LIAEDBZRQ1 regulates against elevated rails.
How does the TL432LIAEDBZRQ1 pinout differ from TL431LIAEDBZRQ1?
The TL432LIAEDBZRQ1 uses inverted pinout in the same SOT-23 (DBZ) package: Pin 1 = REF, Pin 2 = CATHODE, Pin 3 = ANODE. In contrast, TL431LIAEDBZRQ1 assigns Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE. This inversion allows layout flexibility in feedback routing but mandates schematic and footprint verification before board reuse - TL432LIAEDBZRQ1 is not pin-compatible with TL431LIAEDBZRQ1 despite identical package and function.
What is the minimum cathode current required for regulation in TL432LIAEDBZRQ1?
The TL432LIAEDBZRQ1 requires a minimum cathode current (IMIN) of 0.6 mA to maintain regulation and ensure proper amplifier biasing. Below this threshold, the device exits linear operation and reference accuracy degrades. Designers must size the bias resistor or feedback network to guarantee ≥0.6 mA cathode current across all operating conditions - especially at low input voltages or high temperatures where leakage may increase.
Can TL432LIAEDBZRQ1 replace TL431LI-Q1 in existing designs?
TL432LIAEDBZRQ1 can replace TL431LI-Q1 electrically but not mechanically without layout changes, due to its inverted REF/CATHODE pin assignment. The two share identical VREF, tempco, IKA, and IREF specs. To migrate, redesign the PCB footprint and schematic connections - swap REF and CATHODE nets - while retaining all external components. No recalibration or performance impact occurs post-change if pinout is corrected.
What is the temperature coefficient specification for TL432LIAEDBZRQ1?
The TL432LIAEDBZRQ1 Grade 0 variant has a maximum reference voltage deviation (VI(dev)) of 34 mV over –40°C to +150°C, corresponding to an average temperature coefficient of approximately 0.023 mV/°C. This value is measured as the peak-to-peak spread of VREF across temperature, not slope - ensuring predictable, bounded error in high-ambient automotive applications such as exhaust-mounted sensors or under-hood power modules where TL432LIAEDBZRQ1 maintains regulation integrity.
TL432LIAEDBZRQ1 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 ~ 150°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
TL432LIAEDBZRQ1 FAQ
1.How can I place an order for TL432LIAEDBZRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL432LIAEDBZRQ1 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 TL432LIAEDBZRQ1 reliable?
The price and inventory of TL432LIAEDBZRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL432LIAEDBZRQ1 is usually 5 days.
3.What payment methods are accepted for TL432LIAEDBZRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL432LIAEDBZRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL432LIAEDBZRQ1?
TL432LIAEDBZRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL432LIAEDBZRQ1 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 TL432LIAEDBZRQ1?
For technical support, including TL432LIAEDBZRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL432LIAEDBZRQ1 requirements.
6.How does Aetrix verify that TL432LIAEDBZRQ1 is sourced from the original manufacturer or authorized distributors?
All TL432LIAEDBZRQ1 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 TL432LIAEDBZRQ1 meets industry standards.
7.What is the process for return or replacement of TL432LIAEDBZRQ1?
All TL432LIAEDBZRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TL432LIAEDBZRQ1, 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 TL432LIAEDBZRQ1 part is unused and in its original packaging.
Return procedure for TL432LIAEDBZRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL432LIAEDBZRQ1 Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
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LM4040CYM3-2.5-TR
Microchip Technology
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LM4040CYM3-4.1-TR
Microchip Technology
-
LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
Texas Instruments
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LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
-
LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
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