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Diodes Incorporated AP431ARG-7
- Part No.:
- AP431ARG-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AP431ARG-7.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SC59R
- Quantity:
- Payment:
- Shipping:
Inventory:455
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Product details
Overview
AP431ARG-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 and supports programmable output voltages from 2.495V to 36V using two external resistors. It serves as a high-stability replacement for Zener diodes in feedback loops of isolated DC-DC converters.
For engineers reviewing the AP431ARG-7 datasheet, AP431ARG-7 pinout, AP431ARG-7 application, or AP431ARG-7 equivalent, this device is selected for precision voltage monitoring, overvoltage protection, constant-current sink design, and optocoupler-based feedback regulation where tight reference tolerance and low temperature drift are critical.
Technical Context
The AP431ARG-7 implements a bandgap-referenced error amplifier with active cathode drive, enabling sharp turn-on and stable regulation at minimum cathode current of 300μA. Its 30ppm/°C full-range temperature coefficient ensures minimal VREF drift across industrial ambient conditions.
It functions as a 3-terminal programmable shunt: cathode sinks current when REF voltage exceeds 2.495V, with anode tied to ground or return path. The internal architecture delivers low-noise operation and fast transient response-critical for closed-loop stability in flyback and forward converter topologies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495V ±0.5% - enables accurate setpoint without trimming potentiometer, reducing BOM cost and long-term drift. |
| Dynamic Output Impedance | 0.2Ω - maintains tight regulation under load transients, minimizing output voltage deviation in feedback paths. |
| Sink Current Capability | 200mA - supports direct driving of optocoupler LEDs or parallel shunt configurations in high-power SMPS designs. |
| Min Cathode Current | 300μA - allows stable regulation even in ultra-low-power standby modes (e.g., <100μA no-load conditions). |
| Temp Coefficient | 30ppm/°C - ensures ≤±12mV VREF shift over –20°C to +85°C, meeting industrial-grade accuracy requirements. |
| Output Voltage Range | 2.495V to 36V - achieved via external R1/R2 divider, enabling flexible adaptation across 5V–24V system rails. |
| Operating Temperature | –20°C to +85°C - validated for use in industrial power supplies, LED drivers, and battery management systems. |
Pinout & Package
AP431ARG-7 is packaged in SC59R (lead-free, RoHS-compliant), a 3-pin surface-mount package with gull-wing leads. Pin 1 is Anode, Pin 2 is Cathode, Pin 3 is REF (Reference Input).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Anode) | Ground reference terminal | Connected to system ground or return path; establishes common reference for REF and cathode current sink. |
| Pin 2 (Cathode) | Current-sinking output | Sinks up to 200mA to regulate voltage; directly interfaces with optocoupler LED anode or series pass transistor base. |
| Pin 3 (REF) | Precision reference input | Monitors divided output voltage; triggers regulation when voltage exceeds 2.495V ±0.5%, enabling programmable setpoint. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output via resistor divider | Enables precise voltage setpoints from 2.495V to 36V without trimming components-reducing calibration labor and field drift. |
| Low 0.2Ω dynamic output impedance | Maintains regulation stability during rapid load steps, preventing feedback loop oscillation in isolated DC-DC converters. |
| 300μA minimum cathode current | Supports operation in ultra-low-power standby states, extending battery life in always-on monitoring circuits. |
| 30ppm/°C tempco over full range | Delivers ≤±12mV VREF variation across –20°C to +85°C-meeting industrial thermal stability requirements without external compensation. |
| Lead-free, halogen-free SC59R package | Complies with RoHS 2 and JEDEC J-STD-020 moisture sensitivity level 1-enabling lead-free reflow assembly without reliability risk. |
Applications
| Isolated Flyback Converter Feedback | Overvoltage Protection Circuit |
|---|---|
Use Scenario: Regulates output voltage in AC/DC adapters and telecom power supplies using optocoupler-coupled feedback. IC Role / Device Role / Timing Role: Precision shunt regulator providing error signal to optocoupler LED, closing voltage control loop across isolation barrier. Use Value: ±0.5% reference tolerance eliminates need for post-production trimming, improving yield and long-term output stability. |
Use Scenario: Triggers crowbar or shutdown when input voltage exceeds safe threshold in industrial motor drives. IC Role / Device Role / Timing Role: Adjustable voltage monitor comparing scaled input against 2.495V reference to assert fault signal. Use Value: Programmable trip point (e.g., 28V) with 30ppm/°C drift ensures consistent overvoltage response across operating temperature range. |
| Constant-Current LED Driver | Programmable Shunt Regulator for LDO Monitoring |
Use Scenario: Sets fixed current for high-brightness LED strings in signage and automotive lighting. IC Role / Device Role / Timing Role: Sinks current through sense resistor to maintain ILED = VREF/Rsense, independent of supply variation. Use Value: 200mA sink capacity supports multi-LED arrays; low 0.2Ω impedance prevents current droop during pulse-width modulation dimming. |
Use Scenario: Monitors dropout voltage of linear regulators in FPGA power rails to detect input sag or thermal foldback. IC Role / Device Role / Timing Role: Shunt regulator clamps auxiliary monitoring node at precise threshold, triggering supervisor IC reset. Use Value: 300μA min cathode current allows integration into low-quiescent monitoring paths without loading primary LDO output. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDR | 2.495V ±1% reference, 0.22Ω output impedance, SO-8 package | Higher reference tolerance (±1% vs ±0.5%) and larger footprint limit use in space-constrained, high-accuracy designs | Select TL431ACDR only if SO-8 mounting is required and ±1% tolerance suffices for system margin. |
| AS431ART-E1 | 2.495V ±0.5%, SC59R package, but rated only to +70°C ambient | Limited temperature range restricts use in industrial environments exceeding +70°C ambient | Choose AS431ART-E1 only for commercial-grade applications where ambient stays ≤+70°C and sourcing constraints exist. |
Compared with TL431ACDR and AS431ART-E1, AP431ARG-7 uniquely combines ±0.5% reference accuracy, –20°C to +85°C operation, and SC59R compactness-making it optimal for industrial power feedback where precision, thermal robustness, and board area are jointly constrained.
Availability
AP431ARG-7 is available at Aetrix Electronics and suitable for isolated DC-DC converter feedback, overvoltage protection circuits, and constant-current LED driver designs requiring stable component supply and long-term manufacturing continuity.
Supply support for AP431ARG-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 product line was designed specifically for high-accuracy, low-drift shunt regulation in power supply feedback, voltage monitoring, and current source applications-emphasizing thermal stability and ease of external programming.
FAQ
What is the minimum cathode current required for regulation in AP431ARG-7?
The AP431ARG-7 requires a minimum cathode current of 300μA to maintain regulation. This value is confirmed in the Electrical Characteristics table under "IKA(MIN)" at full temperature range. It enables stable operation in low-power standby modes, such as in energy-efficient AC/DC adapters where quiescent current must remain below 500μA.
Can AP431ARG-7 replace a Zener diode directly in existing designs?
Yes-AP431ARG-7 can directly replace Zener diodes in shunt regulator configurations, provided the external resistor network sets the desired output voltage and the anode is grounded. Unlike Zeners, it offers ±0.5% reference accuracy, 30ppm/°C drift, and active turn-on, eliminating Zener's soft knee and wide tolerance stack-up.
What is the maximum power dissipation for AP431ARG-7 in SC59R package?
The AP431ARG-7 in SC59R package has a maximum power dissipation of 400mW at +25°C ambient, per Absolute Maximum Ratings. Derating is required above +25°C: approximately 4.4mW/°C reduction up to +85°C junction limit, yielding ~160mW usable at full operating temperature.
Does AP431ARG-7 support operation with capacitive loads on the cathode?
Yes, but stability depends on load capacitance and series resistance. Per Figure 8 in the datasheet, oscillation may occur with >100nF capacitance unless series resistance ≥150Ω is added. For CL >1µF, a 220Ω damping resistor is recommended to ensure phase margin in feedback applications.
AP431ARG-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:
- SC-59R
AP431ARG-7 FAQ
1.How can I place an order for AP431ARG-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP431ARG-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 AP431ARG-7 reliable?
The price and inventory of AP431ARG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP431ARG-7 is usually 5 days.
3.What payment methods are accepted for AP431ARG-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP431ARG-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP431ARG-7?
AP431ARG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP431ARG-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 AP431ARG-7?
For technical support, including AP431ARG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP431ARG-7 requirements.
6.How does Aetrix verify that AP431ARG-7 is sourced from the original manufacturer or authorized distributors?
All AP431ARG-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 AP431ARG-7 meets industry standards.
7.What is the process for return or replacement of AP431ARG-7?
All AP431ARG-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP431ARG-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 AP431ARG-7 part is unused and in its original packaging.
Return procedure for AP431ARG-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AP431ARG-7 Tags
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