My Inquiry
My Account
Texas Instruments ATL432LIBQDBZRQ1
- Part No.:
- ATL432LIBQDBZRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
ATL432LIBQDBZRQ1.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:6,442
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ATL432LIBQDBZRQ1 from Texas Instruments is an AEC-Q100 Grade 1 (–40°C to +125°C) automotive-grade programmable shunt regulator with 0.5% initial reference voltage tolerance at 25°C, 2.5 V nominal VREF, adjustable output up to 36 V, and 0.65 Ω typical dynamic impedance. It serves as a precision voltage reference, error amplifier, or comparator in feedback loops for DC/DC converters and on-board chargers.
For engineers reviewing the ATL432LIBQDBZRQ1 datasheet, ATL432LIBQDBZRQ1 pinout, ATL432LIBQDBZRQ1 application, or ATL432LIBQDBZRQ1 equivalent, key selection criteria include cathode current capability (0.08–15 mA), low IREF (≤0.4 µA), temperature drift (≤27 mV over –40°C to +125°C), and SOT-23 (DBZ) package compatibility with space-constrained automotive power systems.
Technical Context
The ATL432LIBQDBZRQ1 integrates a precision 2.5 V bandgap reference and high-gain op-amp driving a Darlington sink output stage, enabling sharp turn-on and stable regulation without external compensation. Its open-loop gain supports comparator operation; closed-loop use with resistive feedback sets output voltage from VREF to 36 V.
It operates across –40°C to +125°C with ≤27 mV total VREF deviation, 0.65 Ω dynamic impedance at 1 mA cathode current, and requires ≥65 µA minimum cathode current (Imin) for regulation. Pinout differs from ATL431LI-Q1 variants-REF and CATHODE are swapped in the DBZ package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF Tolerance (25°C) | ±0.5% (B grade): ensures ±12.5 mV absolute accuracy for tight-setpoint applications like OBC voltage monitoring. |
| Adjustable Output Range | 2.5 V to 36 V: enables single-device support for 12 V, 24 V, and 48 V automotive bus regulation via two external resistors. |
| IKA Range | 0.08 mA to 15 mA: supports low-power biasing (e.g., sensor references) and robust shunt sinking (e.g., LED current control). |
| Dynamic Impedance |ZKA| | 0.65 Ω typical at 1 mA: minimizes output voltage shift under load transients, critical for stable feedback in switching regulators. |
| Reference Input Current IREF | ≤0.4 µA max: reduces resistor-divider loading error and enables high-impedance sensing in battery-monitoring circuits. |
| Temperature Drift VI(dev) | ≤27 mV over –40°C to +125°C: guarantees <110 ppm/°C average TC, meeting stringent automotive thermal stability requirements. |
| Package | SOT-23 (DBZ): 2.90 mm × 1.30 mm footprint compatible with automated PCB assembly and high-density power modules. |
Pinout & Package
SOT-23 (DBZ) package: 3-pin surface-mount, 2.90 mm × 1.30 mm body size, 0.95 mm height, gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1: CATHODE | Current Sink Output | Primary shunt path; connects to regulated node (e.g., DC/DC output); sinks up to 15 mA to maintain VREF at REF pin. |
| Pin 2: REF | Reference Input | Sense node for feedback; internal 2.5 V reference compared against voltage divider output; requires ≤0.4 µA input current. |
| Pin 3: ANODE | Common Return | Ground reference for all internal circuitry; must be connected to system ground or lowest potential point in shunt configuration. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation, enabling use in engine bay and powertrain ECUs without derating. |
| 0.5% VREF initial accuracy | Reduces need for post-manufacturing calibration in safety-critical voltage monitoring (e.g., battery pack cell balancing). |
| Low 65 µA Imin (typ) | Enables ultra-low-quiescent-current designs in always-on automotive subsystems, extending standby battery life. |
| Pin-to-pin alternative to TL432LI-Q1 | Direct drop-in replacement with identical electrical specs and DBZ package, simplifying legacy design upgrades. |
| No external capacitor required | Internally compensated for stability with resistive feedback, eliminating BOM cost and layout area for output capacitance. |
Applications
| On-Board Charger (OBC) Voltage Regulation | LED Lighting Current Sink |
|---|---|
Use Scenario: Regulating isolated DC bus voltage in 3.3 kW bidirectional OBCs for EVs. IC Role / Device Role / Timing Role: Shunt regulator in secondary-side feedback loop, setting precise 12 V or 24 V output via optocoupler-coupled divider. Use Value: 0.5% VREF tolerance and ≤27 mV drift ensure ±0.12 V output stability over full vehicle thermal range, meeting ISO 16750-4 requirements. |
Use Scenario: Driving high-brightness cabin and exterior LEDs with constant current in headlight modules. IC Role / Device Role / Timing Role: Precision current-sense reference in emitter-follower BJT current sink topology. Use Value: 0.65 Ω dynamic impedance and 0.4 µA IREF minimize sense-resistor error and thermal drift, maintaining ±2% LED current accuracy. |
| Inverter DC Bus Monitoring | Infotainment Power Supply Feedback |
Use Scenario: Monitoring 400 V traction inverter DC link voltage via resistive divider for overvoltage protection. IC Role / Device Role / Timing Role: Comparator with integrated 2.5 V reference, triggering fault shutdown when divided bus voltage exceeds threshold. Use Value: Open-loop response time <1 µs and 0.5% VREF enable fast, accurate trip points-critical for IGBT short-circuit protection timing. |
Use Scenario: Providing feedback to buck converter controlling 5 V rail for infotainment head units and digital clusters. IC Role / Device Role / Timing Role: Adjustable shunt regulator replacing Zener diode in TL431-based feedback network. Use Value: Lower 65 µA Imin vs. legacy TL431 reduces no-load power by >30%, improving efficiency in always-on display standby modes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL432LI-Q1 | Identical electrical specs and AEC-Q100 Grade 1 rating, but 1% VREF tolerance (A grade) instead of 0.5%. | Suitable where ±25 mV reference accuracy suffices (e.g., non-safety-critical HVAC controls). | Select TL432LI-Q1 only if cost sensitivity outweighs need for tighter voltage setpoint control. |
| ATL431LIBQDBZRQ1 | Same silicon, identical 0.5% VREF and thermal specs, but REF and CATHODE pins swapped in DBZ package. | Requires PCB layout revision due to pinout mismatch; not drop-in compatible. | Choose ATL431LIBQDBZRQ1 only when redesigning for legacy TL431 footprint compatibility. |
Compared with TL432LI-Q1, ATL432LIBQDBZRQ1 delivers tighter initial accuracy for higher-precision regulation; compared with ATL431LIBQDBZRQ1, it offers identical performance with inverted pinout-enabling direct replacement in new layouts designed for its CATHODE-REF-ANODE sequence.
Availability
ATL432LIBQDBZRQ1 is available at Aetrix Electronics and suitable for automotive power conversion, battery management, and lighting systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ATL432LIBQDBZRQ1 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 signal conditioning ICs.
The ATL43xLI-Q1 product line delivers high-accuracy, temperature-stable shunt regulators optimized for automotive power systems-including on-board chargers, inverters, and infotainment supplies-where reliability across –40°C to +125°C is mandatory.
FAQ
What is the maximum cathode voltage rating for ATL432LIBQDBZRQ1?
The ATL432LIBQDBZRQ1 has an absolute maximum cathode-to-anode voltage (VKA) of 37 V. Its recommended operating range is VREF to 36 V, making it suitable for 24 V and 36 V automotive systems. Exceeding 37 V risks permanent damage per Absolute Maximum Ratings in the TI datasheet SNVSBB0A.
Does ATL432LIBQDBZRQ1 require an external output capacitor for stability?
No, ATL432LIBQDBZRQ1 is internally compensated and remains stable without an output capacitor between CATHODE and ANODE when used with resistive feedback. This eliminates capacitor-related BOM cost and layout complexity. However, if a capacitor is added, Figure 13 in the datasheet provides stability boundary guidance based on load capacitance and cathode current.
How does the pinout of ATL432LIBQDBZRQ1 differ from ATL431LI-Q1 in the DBZ package?
In the SOT-23 (DBZ) package, ATL432LIBQDBZRQ1 uses Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE. ATL431LI-Q1 uses Pin 1 = REF, Pin 2 = CATHODE, Pin 3 = ANODE. This swap means they are not pin-compatible-PCB layout must be revised when substituting one for the other.
What is the minimum cathode current needed for regulation in ATL432LIBQDBZRQ1?
The ATL432LIBQDBZRQ1 requires a minimum cathode current (Imin) of 65 µA (typical) and 80 µA (maximum) to maintain regulation. Below this, the device exits linear operation, causing loss of reference accuracy and increased output impedance-critical for low-power always-on automotive circuits.
Can ATL432LIBQDBZRQ1 be used as a comparator, and what is its typical response time?
Yes, ATL432LIBQDBZRQ1 functions as a comparator with integrated 2.5 V reference in open-loop mode. Its response time is sub-microsecond-Figure 24 shows <1 µs rise/fall with 5 mA cathode current. Performance degrades below 1 mA IKA due to reduced gain, so ≥1 mA is recommended for fast switching applications.
ATL432LIBQDBZRQ1 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):
- 2.5V
- 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
ATL432LIBQDBZRQ1 FAQ
1.How can I place an order for ATL432LIBQDBZRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for ATL432LIBQDBZRQ1 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 ATL432LIBQDBZRQ1 reliable?
The price and inventory of ATL432LIBQDBZRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ATL432LIBQDBZRQ1 is usually 5 days.
3.What payment methods are accepted for ATL432LIBQDBZRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ATL432LIBQDBZRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ATL432LIBQDBZRQ1?
ATL432LIBQDBZRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ATL432LIBQDBZRQ1 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 ATL432LIBQDBZRQ1?
For technical support, including ATL432LIBQDBZRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ATL432LIBQDBZRQ1 requirements.
6.How does Aetrix verify that ATL432LIBQDBZRQ1 is sourced from the original manufacturer or authorized distributors?
All ATL432LIBQDBZRQ1 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 ATL432LIBQDBZRQ1 meets industry standards.
7.What is the process for return or replacement of ATL432LIBQDBZRQ1?
All ATL432LIBQDBZRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with ATL432LIBQDBZRQ1, 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 ATL432LIBQDBZRQ1 part is unused and in its original packaging.
Return procedure for ATL432LIBQDBZRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ATL432LIBQDBZRQ1 Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
-
LM4040CYM3-2.5-TR
Microchip Technology
-
LM4040CYM3-4.1-TR
Microchip Technology
-
LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
-
LM4040D20IDBZR
Texas Instruments
-
LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
-
LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
