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Diodes Incorporated AP431ASAG-7
- Part No.:
- AP431ASAG-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AP431ASAG-7.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,911
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Product details
Overview
AP431ASAG-7 from Diodes Incorporated is an adjustable precision shunt regulator with 2.495V ±0.5% reference voltage, 0.2Ω dynamic output impedance, and 200mA sink current capability. It operates over –20°C to +85°C, supports programmable output voltages from 2.495V to 36V via external resistors, and replaces Zener diodes in feedback loops of AC/DC adapters and LED drivers.
For engineers reviewing the AP431ASAG-7 datasheet, AP431ASAG-7 pinout, AP431ASAG-7 application, or AP431ASAG-7 equivalent, this device is selected for high-accuracy voltage regulation, low-drift feedback networks, and cost-sensitive power supply designs requiring stable 2.5V reference performance across temperature.
Technical Context
The AP431ASAG-7 implements a precision bandgap reference core with active output circuitry enabling sharp turn-on characteristics and fast transient response. Its internal architecture delivers 0.5% initial reference tolerance and 30ppm/°C full-range temperature coefficient, ensuring minimal drift in closed-loop regulation.
It functions as a 3-terminal programmable shunt regulator: cathode sinks current to ground when REF voltage exceeds 2.495V, with minimum regulation current of 300μA and off-state leakage below 1.0μA at 36V cathode voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495V ±0.5% - enables accurate, fixed-point voltage setting without trim potentiometers |
| Sink Current Capability | 200mA - supports direct regulation of medium-power feedback paths without external amplification |
| Dynamic Output Impedance | 0.2Ω - ensures stable loop gain and minimal output voltage variation under load transients |
| Min Cathode Current | 300μA - allows operation in ultra-low-power bias networks (e.g., high-resistance divider topologies) |
| Temp Coefficient | 30ppm/°C - guarantees ≤±8mV total reference drift over –20°C to +85°C operating range |
| Output Voltage Range | 2.495V to 36V - configurable via two-resistor divider, eliminating need for multiple fixed-voltage regulators |
| Operating Temp Range | –20°C to +85°C - qualified for extended commercial applications including industrial power supplies |
Pinout & Package
AP431ASAG-7 is packaged in SOT23 (SA code), a 3-pin surface-mount package with 1.3mm × 2.4mm footprint and 0.915mm height. Pin 1 = Cathode, Pin 2 = Anode, Pin 3 = REF (Reference Input).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Current Sink Node | Primary output terminal; sinks up to 200mA to maintain regulated voltage at REF node |
| Anode (Pin 2) | Ground Reference | Return path for cathode current; must be connected to system ground or low-impedance return plane |
| REF (Pin 3) | Feedback Input | High-impedance (1.4–3.5μA typical) input sensing voltage divider output; sets regulation threshold |
Key Features
| Feature | Design Value |
|---|---|
| Precision reference voltage tolerance | ±0.5% - eliminates post-manufacturing calibration and reduces BOM count in feedback networks |
| Low dynamic output impedance | 0.2Ω - maintains regulation stability under rapid load steps in SMPS feedback loops |
| Fast turn-on response | Sub-microsecond rise time - prevents overshoot during power-up or line transients in regulated supplies |
| Programmable output voltage | 2.495V–36V - single part replaces multiple fixed-output shunt regulators across product families |
| Lead-free & halogen-free | RoHS-compliant SOT23 package - meets IPC-J-STD-020 moisture sensitivity level 1 and JEDEC MSL-1 requirements |
Applications
| AC/DC Adapter Feedback | LED Constant-Current Driver |
|---|---|
|
Use Scenario: Secondary-side voltage regulation in isolated flyback converters powering consumer electronics. IC Role / Device Role / Timing Role: Shunt regulator providing precise error signal to optocoupler input, closing primary-side PWM control loop. Use Value: ±0.5% reference tolerance ensures ±1% output voltage accuracy across line/load/temperature, meeting USB PD and Energy Star requirements. |
Use Scenario: High-efficiency constant-current sink for mid-power LED strings in architectural lighting. IC Role / Device Role / Timing Role: Adjustable shunt regulating current through sense resistor, enabling dimming via analog voltage control at REF pin. Use Value: 30ppm/°C tempco maintains <±3% current drift over –20°C to +65°C ambient, preserving lumen consistency. |
| Overvoltage Protection Circuit | Programmable Voltage Monitor |
|
Use Scenario: Crowbar-triggered shutdown in DC power distribution systems protecting downstream FETs and ICs. IC Role / Device Role / Timing Role: Precision comparator with hysteresis (via external R1/R2) detecting overvoltage thresholds above 2.495V. Use Value: 0.2Ω output impedance ensures clean, jitter-free trigger edge into SCR gate, minimizing false trips during ripple. |
Use Scenario: Dual-threshold monitoring of battery voltage in portable medical devices to enable low-battery warning and shutdown. IC Role / Device Role / Timing Role: Configured as window comparator using two resistor dividers to detect voltage between 3.0V and 4.2V. Use Value: 1.4–3.5μA REF input current enables high-impedance divider design (>1MΩ), extending battery life by >100 hours in sleep mode. |
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 | 2.495V ±1%, 100mA max sink, SO-8 package, higher 0.5Ω output impedance | Lower current rating limits use in high-gain feedback paths; SO-8 footprint increases board area vs. SOT23 | Select when legacy SO-8 layout reuse is required and 100mA sink suffices |
| KA431AZTA | 2.495V ±2%, 100mA max sink, TO-92 package, 0.3Ω output impedance, no RoHS compliance | Through-hole mounting incompatible with modern SMT lines; ±2% tolerance requires trimmer in critical feedback paths | Select only for repair of legacy through-hole equipment where lead-free compliance is not mandated |
Compared with TL431ACDBVR and KA431AZTA, AP431ASAG-7 offers tighter 0.5% reference tolerance, higher 200mA sink current, lower 0.2Ω output impedance, and RoHS-compliant SOT23 packaging-making it optimal for space-constrained, high-accuracy, high-reliability SMT power supply designs.
Availability
AP431ASAG-7 is available at Aetrix Electronics and suitable for AC/DC adapters, LED drivers, overvoltage protection circuits, and programmable voltage monitors requiring stable component supply and long-term production continuity.
Supply support for AP431ASAG-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 power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.
The AP431/AP431A series was designed specifically for high-accuracy, low-cost voltage regulation in switch-mode power supplies and feedback control systems-emphasizing thermal stability, low noise, and compatibility with standard resistor-divider networks.
FAQ
What is the minimum cathode current required for regulation in AP431ASAG-7?
The AP431ASAG-7 requires a minimum cathode current of 300μA to maintain regulation. This value is confirmed in the Electrical Characteristics table (IKA(MIN)) and enables reliable operation even with high-value resistor dividers (e.g., 1MΩ top resistor at 5V). Below this threshold, the device exits regulation and REF voltage drops below 2.495V.
Can AP431ASAG-7 replace a Zener diode directly in existing designs?
Yes-AP431ASAG-7 can directly replace Zener diodes in shunt regulator configurations. Its 3-pin SOT23 footprint matches common Zener packages, and its active circuitry provides sharper knee characteristics, lower dynamic impedance (0.2Ω vs. typical Zener's 5–20Ω), and tighter voltage tolerance (±0.5% vs. ±5% for standard Zeners), improving overall regulation accuracy.
Is AP431ASAG-7 suitable for automotive applications?
No-AP431ASAG-7 is specified for extended commercial temperature range (–20°C to +85°C) and is not AEC-Q200 qualified. For automotive applications, Diodes Incorporated recommends the AEC-Q200 qualified AP431AQG-13 (SOT25) or AP431AYG-13 (SOT89), which undergo extended temperature screening and stress testing per automotive reliability standards.
How does the REF pin input current affect divider resistor selection?
The REF pin draws 1.4–3.5μA (typical 2.2μA), so divider resistors must be chosen to ensure this current causes <0.1% error in the setpoint voltage. For example, with R2 = 10kΩ, R1 ≤ 240kΩ keeps REF loading error below 0.1%. Higher resistor values increase thermal noise and susceptibility to EMI, while lower values increase power loss.
AP431ASAG-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:
- Obsolete
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 2.495V
- Voltage - Output (Max):
- 36 V
- Current - Output:
- 200 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- 30ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 500 µA
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
AP431ASAG-7 FAQ
1.How can I place an order for AP431ASAG-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP431ASAG-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 AP431ASAG-7 reliable?
The price and inventory of AP431ASAG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP431ASAG-7 is usually 5 days.
3.What payment methods are accepted for AP431ASAG-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP431ASAG-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP431ASAG-7?
AP431ASAG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP431ASAG-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 AP431ASAG-7?
For technical support, including AP431ASAG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP431ASAG-7 requirements.
6.How does Aetrix verify that AP431ASAG-7 is sourced from the original manufacturer or authorized distributors?
All AP431ASAG-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 AP431ASAG-7 meets industry standards.
7.What is the process for return or replacement of AP431ASAG-7?
All AP431ASAG-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP431ASAG-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 AP431ASAG-7 part is unused and in its original packaging.
Return procedure for AP431ASAG-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AP431ASAG-7 Tags
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TL431AIDBZR
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TL431BQDBZR
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AN431AN-ATRG1
Diodes Incorporated
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LM4040CYM3-2.5-TR
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LM4040CYM3-4.1-TR
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LM4040EIM3-2.5/NOPB
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AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
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AZ431LANTR-G1
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