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Diodes Incorporated AZ9431AQSA-7
- Part No.:
- AZ9431AQSA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AZ9431AQSA-7.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:3,534
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Product details
Overview
AZ9431AQSA-7 from Diodes Incorporated is an automotive-grade, three-terminal adjustable precision shunt regulator with 0.5% reference voltage tolerance at +25°C, 1.24V nominal output (adjustable 1.24V–18V), 20 ppm/°C temperature coefficient, and AEC-Q100 Grade 1 qualification for use in vehicle power management and feedback loops.
For engineers reviewing the AZ9431AQSA-7 datasheet, AZ9431AQSA-7 pinout, AZ9431AQSA-7 application, or AZ9431AQSA-7 equivalent, this part serves as a high-stability, low-noise voltage reference in closed-loop DC-DC converters, battery monitoring circuits, and automotive sensor signal conditioning where zener replacement with improved thermal drift and dynamic impedance is required.
Technical Context
The AZ9431AQSA-7 operates as a two-input, one-output shunt reference: cathode voltage (VKA) and reference input current (IREF) jointly determine regulation point via internal bandgap circuitry. Its sharp turn-on and low 0.05Ω typical dynamic impedance enable stable operation under capacitive loads up to 10 µF without oscillation.
It functions across –40°C to +125°C ambient, with <4 mV total reference deviation over full temperature range and <0.5 mV/V cathode voltage sensitivity - critical for precision feedback in PWM controllers and current-sense amplifiers where supply rail variation must not perturb reference accuracy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF (25°C) | 1.24 V ±0.5% - sets precise regulation threshold for feedback networks in automotive power supplies |
| Temp Coefficient | 20 ppm/°C - ensures ≤±2.5 mV drift over –40°C to +125°C, enabling stable reference in engine bay environments |
| ZKA (Dynamic Impedance) | 0.05 Ω typical - maintains tight regulation under fast load transients in switching regulator error amplifiers |
| IKA Range | 0.1 mA to 100 mA - supports wide sink-current flexibility for both low-power biasing and high-current shunt applications |
| VKA Max | 20 V - allows direct use in 12V/24V automotive systems with margin for load dump transients |
| ΔVREF (–40°C to +125°C) | ≤4 mV - guarantees minimal reference shift across full automotive temperature range without external trimming |
| ESD Rating | HBM ±6 kV - meets robustness requirements for handling and assembly in automotive manufacturing lines |
Pinout & Package
Supplied in SOT23-3 package (JEDEC TO-236AB), with 100% matte tin-plated leads, moisture sensitivity level 1, and 0.009 g unit weight. Thermal resistance θJC = 45°C/W on standard 1"x1" FR-4 PCB with 2 oz copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: Cathode | Output node for regulated voltage reference | Connected to feedback divider midpoint in shunt regulator topologies; sinks current to maintain VKA = VREF × (1 + R1/R2) |
| 2: Anode | Ground return path | Low-impedance connection to system ground; must be routed with minimal trace inductance to preserve stability |
| 3: Reference | Internal bandgap reference input | Connects externally to voltage divider junction; senses output voltage and adjusts cathode current to hold VREF constant |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | 1.24V–18V via two external resistors - eliminates need for multiple fixed-voltage references in multi-rail designs |
| Thermal stability | ≤4 mV total ΔVREF over –40°C to +125°C - enables single-reference design across entire automotive ambient range without calibration |
| Capacitive load immunity | Stable with ≥10 µF output capacitance - simplifies EMI filtering and eliminates need for series damping resistors |
| Low IREF | 0.15 µA typical - minimizes divider current loss in high-impedance feedback networks, improving power efficiency |
| AEC-Q100 qualification | Grade 1 (–40°C to +125°C) with PPAP capability - satisfies OEM requirements for functional safety-critical voltage references |
Applications
| Automotive DC-DC Converter Feedback | Battery Management System Reference |
|---|---|
Use Scenario: Precision voltage sensing in 12V-to-5V buck converter for infotainment head units. IC Role / Device Role / Timing Role: Shunt regulator providing stable 1.24V reference to error amplifier, enabling accurate output voltage regulation despite input ripple and temperature swing. Use Value: 20 ppm/°C tempco and 0.05Ω ZKA ensure ≤±1% output voltage deviation across –40°C to +105°C ambient, meeting ISO 16750-4 requirements. |
Use Scenario: Cell voltage monitoring in 12S Li-ion traction battery packs. IC Role / Device Role / Timing Role: High-accuracy reference for ADC front-end in battery monitor ICs, ensuring consistent cell voltage measurement resolution. Use Value: 0.5% initial tolerance and ≤4 mV full-range drift allow sub-10mV cell voltage measurement error without software calibration. |
| Engine Control Unit Sensor Biasing | Onboard Charger Voltage Reference |
Use Scenario: Providing excitation voltage to RTD and thermistor sensors in ECU coolant/air temperature modules. IC Role / Device Role / Timing Role: Low-noise, low-drift reference source for ratiometric sensor signal conditioning circuits. Use Value: Low 0.15 µA IREF minimizes self-heating error in high-resistance sensor bridges, while 6 kV HBM ESD rating withstands assembly handling. |
Use Scenario: Setting output voltage in bidirectional AC/DC onboard chargers for EVs. IC Role / Device Role / Timing Role: Primary feedback reference in isolated flyback or LLC controller secondary-side regulation loop. Use Value: Stable operation with >1 µF Y-capacitance on secondary side eliminates need for optocoupler compensation networks, reducing BOM count and failure modes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDBVR | 2% initial tolerance, 50 ppm/°C tempco, no AEC-Q100 qualification | Suitable for commercial-grade power supplies but lacks automotive reliability validation | Select when cost sensitivity outweighs automotive qualification and long-term drift stability |
| AS431AQTR-G1 | 1% tolerance, 30 ppm/°C tempco, AEC-Q100 Grade 1 qualified | Higher drift than AZ9431AQSA-7 limits use in high-precision feedback paths above 85°C | Choose for legacy designs requiring pin compatibility with TL431 footprint and moderate automotive compliance |
Compared with TL431ACDBVR and AS431AQTR-G1, the AZ9431AQSA-7 delivers superior thermal stability (20 vs. 30–50 ppm/°C) and tighter initial tolerance (0.5% vs. 1–2%), making it optimal for next-generation automotive power systems demanding <±0.5% output regulation over life.
Availability
AZ9431AQSA-7 is available at Aetrix Electronics and suitable for automotive power conversion, battery management, engine control unit sensor interfaces, and onboard EV charger designs requiring stable component supply with full AEC-Q100 documentation support.
Supply support for AZ9431AQSA-7 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability components for automotive, industrial, and computing markets with IATF 16949-certified production facilities.
The AZ9431Q series belongs to Diodes' automotive-qualified precision reference product line, designed specifically to replace zener diodes in safety-critical feedback loops where thermal drift, noise, and long-term stability directly impact system-level functional safety compliance.
FAQ
What is the minimum cathode current required for regulation in AZ9431AQSA-7?
The AZ9431AQSA-7 requires a minimum cathode current of 55 µA (typical) to maintain regulation, verified per DS40953 Rev. 2–2 Section 3 Electrical Characteristics. This low turn-on threshold enables reliable operation in high-impedance feedback networks where divider currents fall below 100 µA, such as in ultra-low-power battery monitoring circuits.
Can AZ9431AQSA-7 drive a 10 µF ceramic capacitor directly without instability?
Yes - the AZ9431AQSA-7 is characterized for stable operation with ≥10 µF capacitive loads across its full operating range, as confirmed by stability boundary plots in DS40953 Figure 11. Its internal compensation eliminates need for series resistance or external phase compensation, simplifying layout in space-constrained automotive modules.
How does the 0.5% reference voltage tolerance affect system-level accuracy?
The 0.5% VREF tolerance at +25°C contributes directly to output voltage error in shunt-regulated feedback loops. For example, in a 5V buck converter using R1=10kΩ/R2=3.16kΩ, this translates to ±25 mV absolute output error before considering resistor tolerance and temperature drift - making it suitable for ASIL-B compliant subsystems where tighter tolerances are enforced at system level.
Is AZ9431AQSA-7 compatible with lead-free reflow profiles?
Yes - the AZ9431AQSA-7 uses matte tin-plated leads and is rated for peak reflow temperatures up to 260°C per J-STD-020, with moisture sensitivity level 1. Its green molding compound is fully RoHS 3 compliant (2015/863/EU), halogen-free (<900 ppm Br+Cl), and antimony-free, supporting standard lead-free manufacturing processes without special baking or handling.
AZ9431AQSA-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Discontinued at Digi-Key
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 1.24V
- Voltage - Output (Max):
- 18 V
- Current - Output:
- 100 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- 20ppm/°C
- 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
AZ9431AQSA-7 FAQ
1.How can I place an order for AZ9431AQSA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ9431AQSA-7 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 AZ9431AQSA-7 reliable?
The price and inventory of AZ9431AQSA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ9431AQSA-7 is usually 5 days.
3.What payment methods are accepted for AZ9431AQSA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ9431AQSA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ9431AQSA-7?
AZ9431AQSA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ9431AQSA-7 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 AZ9431AQSA-7?
For technical support, including AZ9431AQSA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ9431AQSA-7 requirements.
6.How does Aetrix verify that AZ9431AQSA-7 is sourced from the original manufacturer or authorized distributors?
All AZ9431AQSA-7 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 AZ9431AQSA-7 meets industry standards.
7.What is the process for return or replacement of AZ9431AQSA-7?
All AZ9431AQSA-7 units undergo pre-shipment inspection (PSI). If there is an issue with AZ9431AQSA-7, 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 AZ9431AQSA-7 part is unused and in its original packaging.
Return procedure for AZ9431AQSA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AZ9431AQSA-7 Tags
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