My Inquiry
My Account
Diodes Incorporated AZ9431BQSA-7
- Part No.:
- AZ9431BQSA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AZ9431BQSA-7.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:6,054
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AZ9431BQSA-7 from Diodes Incorporated is an automotive-grade, adjustable precision shunt regulator IC with 1.24V reference voltage, ±1% tolerance at +25°C, 20 ppm/°C temperature coefficient, and 0.05Ω typical dynamic impedance. It operates from −40°C to +125°C, supports cathode current up to 100mA, and replaces Zener diodes in feedback loops of DC-DC converters and voltage monitors in engine control units.
For engineers reviewing the AZ9431BQSA-7 datasheet, AZ9431BQSA-7 pinout, AZ9431BQSA-7 application, or AZ9431BQSA-7 equivalent, key selection criteria include its AEC-Q100 Grade 1 qualification, SOT23 package compatibility, programmable 1.24V–18V output via two resistors, low temperature drift (±4 mV over −40°C to +125°C), and stable operation under capacitive loads up to 10 µF.
Technical Context
The AZ9431BQSA-7 functions as a three-terminal adjustable shunt reference with internal bandgap-derived reference and high-gain error amplifier. Its cathode-anode configuration enables precise regulation by sinking current through an external resistor network to set output voltage.
It delivers sharp turn-on characteristics and maintains <±10 mV reference deviation across −40°C to +125°C, with dynamic impedance ≤0.15Ω (1mA–100mA) and reference input current ≤0.4 µA - enabling high-accuracy feedback in isolated flyback and PWM controllers without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V ±1% at +25°C - sets base accuracy for programmable output voltage from 1.24V to 18V |
| Temp Coefficient | 20 ppm/°C - ensures ≤±4 mV total drift over −40°C to +125°C, critical for automotive ambient stability |
| Dynamic Impedance | 0.05 Ω typical - minimizes output voltage perturbation during load transients in closed-loop regulation |
| Cathode Current Range | 0.1 mA to 100 mA - supports wide-spectrum sink capability for both low-power biasing and high-current shunt regulation |
| Operating Temp | −40°C to +125°C - qualified per AEC-Q100 Grade 1 for under-hood automotive electronics |
| Package | SOT23 - surface-mount footprint compatible with standard reflow profiles and space-constrained PCB layouts |
| ESD Rating | ±6 kV HBM - withstands handling and assembly ESD events without degradation in reference performance |
Pinout & Package
Supplied in SOT23 package (JEDEC TO-236AB), 3-pin, single-die construction with matte tin-plated leads. Thermal resistance θJC = 45°C/W on 1"×1" FR-4 board with 2 oz copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1: Cathode | Current sink node | Connects to regulated output node; sinks adjustable current to maintain reference voltage at Pin 2 |
| Pin 2: Reference | Feedback input | High-impedance node tied to voltage divider; senses output and controls cathode current to hold 1.24V |
| Pin 3: Anode | Ground reference | Common return path for reference and cathode currents; must be low-impedance to avoid regulation error |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Output Range | 1.24V–18V using two external resistors - eliminates need for multiple fixed-voltage references in multi-rail systems |
| Low Temp Drift | ≤±4 mV over full −40°C to +125°C range - enables stable feedback in engine control modules and battery management sensors |
| Capacitive Load Stability | Stable with ≥1 µF ceramic output capacitance - simplifies EMI filtering and eliminates need for series damping resistors |
| High Sink Current | 100 mA max cathode current - supports direct driving of optocoupler LEDs or TL431 replacement in isolated power supplies |
| Automotive Qualification | AEC-Q100 Grade 1, PPAP-capable, IATF 16949 manufacturing - meets OEM requirements for change control and traceability |
Applications
| Engine Control Unit (ECU) Feedback | On-Board Charger (OBC) Voltage Monitor |
|---|---|
Use Scenario: Regulates 12V auxiliary rail in gasoline/diesel ECU to stabilize microcontroller supply and sensor biasing. IC Role / Device Role / Timing Role: Adjustable shunt reference providing precise 5.0V feedback to PWM controller via resistor divider. Use Value: Maintains ±1% output accuracy over −40°C to +125°C ambient, eliminating calibration drift in cold-start and hot-soak conditions. |
Use Scenario: Monitors 400V DC-link voltage in EV on-board chargers using resistive scaling and isolation. IC Role / Device Role / Timing Role: High-stability reference for optocoupler-based feedback loop in isolated secondary-side regulation. Use Value: Enables <±0.5% system-level voltage sensing accuracy despite 100kΩ+ divider impedance and 100nF isolation capacitor. |
| Battery Management System (BMS) Cell Balancing | ADAS Camera Power Supply |
Use Scenario: Provides reference for active cell-balancing FET gate drivers in 12S Li-ion packs. IC Role / Device Role / Timing Role: Precision voltage threshold detector triggering balancing current when cell voltage exceeds 4.25V. Use Value: Delivers <±2 mV trip-point repeatability across temperature, reducing false triggers and extending balancing cycle life. |
Use Scenario: Stabilizes 3.3V LDO output powering image signal processor and MIPI interface in surround-view cameras. IC Role / Device Role / Timing Role: Low-noise shunt reference improving PSRR of downstream LDO by >15 dB at 100 kHz. Use Value: Reduces power-supply-induced jitter in pixel clock generation, lowering image noise and motion artifacts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431BIDBZR | ±0.5% initial tolerance, 50 ppm/°C tempco, 0.2Ω dynamic impedance, SO-8 package | Higher accuracy but larger footprint and lower thermal robustness; not AEC-Q100 qualified | Select for non-automotive industrial designs requiring tighter initial tolerance and higher sink current (100mA) |
| AZ431LBN-TRG1 | Commercial-grade (non-AEC), ±0.5% tolerance, 20 ppm/°C, SOT23, 100mA sink | Lacks PPAP documentation, IATF 16949 traceability, and extended temp validation | Select for cost-sensitive consumer or telecom applications where automotive compliance is unnecessary |
Compared with TL431BIDBZR and AZ431LBN-TRG1, the AZ9431BQSA-7 uniquely combines AEC-Q100 Grade 1 qualification, ±1% tolerance with 20 ppm/°C stability, and SOT23 packaging - making it the only option qualified for production automotive feedback loops requiring PPAP and thermal reliability.
Availability
AZ9431BQSA-7 is available at Aetrix Electronics and suitable for engine control units, on-board chargers, battery management systems, and ADAS camera power supplies requiring stable component supply, automotive qualification, and long-term lifecycle support.
Supply support for AZ9431BQSA-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.
The AZ9431Q series belongs to Diodes' automotive-qualified precision reference product line, designed specifically to replace Zener diodes in safety-critical feedback paths while meeting AEC-Q100 Grade 1 and PPAP requirements.
FAQ
What is the minimum cathode current required for regulation in AZ9431BQSA-7?
The AZ9431BQSA-7 requires a minimum cathode current of 55 µA (typical) to maintain regulation, with 80 µA specified as maximum under worst-case conditions. This low start-up current enables use in ultra-low-power monitoring circuits where supply current must remain below 100 µA.
Can AZ9431BQSA-7 operate stably with a 10 µF ceramic output capacitor?
Yes - the AZ9431BQSA-7 remains stable with capacitive loads up to 10 µF, as confirmed by stability boundary plots in the datasheet. No series damping resistor is needed, unlike many older shunt references, due to its optimized internal compensation and low 0.05Ω dynamic impedance.
How does the reference input current vary over temperature?
The reference input current (IREF) ranges from 0.15 µA to 0.4 µA at +25°C and deviates by only ±0.1 µA over −40°C to +125°C. This tight variation ensures consistent voltage-divider loading and prevents output voltage shift in high-impedance feedback networks.
Is AZ9431BQSA-7 pin-compatible with TL431 in SOT23 packages?
No - TL431 is not offered in SOT23; common TL431 packages are SO-8 and TO-92. The AZ9431BQSA-7 uses SOT23 pinout (Cathode–Reference–Anode), which differs from TL431's pin assignments and cannot be substituted without PCB redesign and resistor network recalibration.
AZ9431BQSA-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- 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):
- 1.24V
- Voltage - Output (Max):
- 18 V
- Current - Output:
- 100 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- 20ppm/°C Typical
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
AZ9431BQSA-7 FAQ
1.How can I place an order for AZ9431BQSA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ9431BQSA-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 AZ9431BQSA-7 reliable?
The price and inventory of AZ9431BQSA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ9431BQSA-7 is usually 5 days.
3.What payment methods are accepted for AZ9431BQSA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ9431BQSA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ9431BQSA-7?
AZ9431BQSA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ9431BQSA-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 AZ9431BQSA-7?
For technical support, including AZ9431BQSA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ9431BQSA-7 requirements.
6.How does Aetrix verify that AZ9431BQSA-7 is sourced from the original manufacturer or authorized distributors?
All AZ9431BQSA-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 AZ9431BQSA-7 meets industry standards.
7.What is the process for return or replacement of AZ9431BQSA-7?
All AZ9431BQSA-7 units undergo pre-shipment inspection (PSI). If there is an issue with AZ9431BQSA-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 AZ9431BQSA-7 part is unused and in its original packaging.
Return procedure for AZ9431BQSA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AZ9431BQSA-7 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
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…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
