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Diodes Incorporated AP431SAG-7
- Part No.:
- AP431SAG-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AP431SAG-7.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,718
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Product details
Overview
AP431SAG-7 from Diodes Incorporated is a 3-terminal adjustable precision shunt regulator with 2.495V ±1% reference voltage, 0.2Ω dynamic output impedance, and 200mA sink current capability. It operates from -20°C to +85°C and sets output voltages from 2.495V to 36V using two external resistors-commonly used in feedback loops of isolated DC-DC converters and voltage monitors.
For engineers reviewing the AP431SAG-7 datasheet, AP431SAG-7 pinout, AP431SAG-7 application, or AP431SAG-7 equivalent, this device serves as a Zener diode replacement in precision voltage regulation, overvoltage protection, and current source circuits where tight reference tolerance and low temperature drift are required.
Technical Context
The AP431SAG-7 implements an internal bandgap reference and high-gain transconductance amplifier driving an NPN output stage, enabling sharp turn-on and stable regulation across load and line variations. Its reference input draws only 1.4–3.5µA and exhibits 30ppm/°C full-range temperature coefficient.
It functions as a programmable shunt element: cathode-anode voltage is regulated by adjusting the REF terminal voltage via external resistor divider, with minimum cathode current of 0.19mA for regulation and off-state leakage below 1.0µA at 36V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495V ±1% - enables fixed or adjustable regulation without trimming potentiometers |
| Sink Current | 200mA - supports direct error amplification and feedback drive in SMPS controllers |
| Dynamic Impedance | 0.2Ω - ensures minimal output voltage deviation under fast load transients |
| Temp Coefficient | 30ppm/°C - guarantees <±8mV drift over -20°C to +85°C for stable loop performance |
| Min Cathode Current | 0.19mA - allows operation with high-value feedback resistors, reducing power loss |
| Output Voltage Range | 2.495V to 36V - configurable via R1/R2 divider for wide-ranging supply and protection thresholds |
| Operating Temp | -20°C to +85°C - qualified for industrial-grade power supplies and embedded systems |
Pinout & Package
AP431SAG-7 is supplied in SOT23 package (3-pin, surface-mount), with lead-free and halogen-free "Green" construction per Diodes Incorporated specifications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Regulated output node | Connects to high-side of load or feedback network; sinks current to maintain VREF at REF pin |
| Anode (Pin 2) | Return path | Common ground reference for internal amplifier; must be tied to system GND or return rail |
| REF (Pin 3) | Reference input | Sense point for external resistor divider; regulates cathode voltage when held at 2.495V |
Key Features
| Feature | Design Value |
|---|---|
| Precision reference tolerance | ±1% at 25°C - eliminates need for post-production calibration in cost-sensitive power designs |
| Low reference input current | 1.4–3.5µA - permits use of >1MΩ feedback dividers, minimizing standby power consumption |
| Fast turn-on response | Sub-microsecond settling - supports dynamic load regulation in digitally controlled PSUs |
| Low output noise | Not specified in datasheet but implied by low-Z design - reduces ripple injection into sensitive analog feedback paths |
| RoHS & Green compliant | Lead-free, Br/Sb-free SOT23 - meets IPC-1752A material declaration requirements for global OEMs |
Applications
| Isolated Flyback Feedback | Voltage Monitor Circuit |
|---|---|
Use Scenario: Secondary-side voltage sensing in AC-DC adapters with optocoupler-coupled feedback. IC Role / Device Role / Timing Role: Shunt regulator providing precise 2.5V reference to drive optocoupler LED, closing control loop across isolation barrier. Use Value: Enables ±1% output regulation without primary-side sensing, reducing BOM count and improving safety certification compliance. | Use Scenario: Dual-threshold detection for battery overvoltage/undervoltage alerts in portable electronics. IC Role / Device Role / Timing Role: Programmable comparator reference node, setting trip points via resistor networks on REF pin. Use Value: Replaces discrete Zener + op-amp solutions with single-component, temperature-stable threshold generation. |
| Constant-Current Sink | Crowbar Overvoltage Protection |
Use Scenario: LED biasing or sensor excitation requiring stable current independent of supply variation. IC Role / Device Role / Timing Role: Shunt-based current source where cathode current equals VREF/RSET, referenced to grounded anode. Use Value: Delivers 1% accurate current up to 200mA with no external op-amp or sense resistor matching. | Use Scenario: Latching overvoltage shutdown in 12V automotive subsystems during load dump events. IC Role / Device Role / Timing Role: Trigger element that rapidly shorts output to ground when sensed voltage exceeds programmed threshold. Use Value: Responds within microseconds to >30V transients, protecting downstream ICs without delay or external timing components. |
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 ±0.5%, SO-8 package, higher 100mA max cathode current | Limited to lower-current feedback paths; requires larger PCB footprint | Select when tighter reference tolerance and SO-8 thermal mass are prioritized over size and cost |
| AS431ATZ | 2.495V ±0.5%, SC59 package, 200mA rating, same pinout as AP431SAG-7 | Identical functional behavior but not recommended for new designs per Diodes' notice | Acceptable for legacy redesigns where AS431 documentation and qualification history are already established |
Compared with TL431ACDBVR and AS431ATZ, AP431SAG-7 offers optimal balance of SOT23 compactness, 200mA sink capability, and ±1% tolerance-making it preferred for space-constrained industrial power supplies where long-term availability and RoHS/Green compliance are mandatory.
Availability
AP431SAG-7 is available at Aetrix Electronics and suitable for isolated flyback feedback, voltage monitor circuits, constant-current sink designs, and crowbar overvoltage protection requiring stable component supply and industrial temperature range support.
Supply support for AP431SAG-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 power management and signal integrity solutions for industrial, computing, and consumer markets.
The AP431/AP431A product line delivers precision shunt regulation for feedback, monitoring, and protection functions in cost-sensitive, thermally constrained power systems-designed specifically to replace Zener diodes with superior stability and programmability.
FAQ
What is the maximum cathode-to-anode voltage rating for AP431SAG-7?
The absolute maximum cathode voltage is +36V relative to anode. Exceeding this risks permanent damage. The device regulates only when cathode voltage is ≥2.495V; operation below this threshold places it in high-impedance off-state with leakage <1.0µA at 36V reverse bias.
Can AP431SAG-7 be used in place of a Zener diode without circuit modification?
Yes-when replacing a Zener, connect cathode to the node previously tied to Zener anode, anode to ground, and REF to the same node as Zener cathode. External resistor divider is required only if regulation voltage differs from 2.495V; for basic 2.5V clamping, tie REF directly to cathode.
Does AP431SAG-7 require a minimum load current to maintain regulation?
Yes-it requires ≥0.19mA cathode current (IKA(MIN)) to sustain regulation. Below this, output impedance rises sharply and reference accuracy degrades. Designers must ensure feedback resistor values yield sufficient current even at lowest operating voltage.
Is AP431SAG-7 suitable for automotive applications?
No-it is rated for -20°C to +85°C, which falls short of AEC-Q100 Grade 2 (-40°C to +105°C) requirements. While used in some non-safety automotive subsystems, Diodes Incorporated explicitly states it is "NOT RECOMMENDED FOR NEW DESIGN" and lacks automotive qualification documentation.
AP431SAG-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:
- ±1%
- 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
AP431SAG-7 FAQ
1.How can I place an order for AP431SAG-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP431SAG-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 AP431SAG-7 reliable?
The price and inventory of AP431SAG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP431SAG-7 is usually 5 days.
3.What payment methods are accepted for AP431SAG-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP431SAG-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP431SAG-7?
AP431SAG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP431SAG-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 AP431SAG-7?
For technical support, including AP431SAG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP431SAG-7 requirements.
6.How does Aetrix verify that AP431SAG-7 is sourced from the original manufacturer or authorized distributors?
All AP431SAG-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 AP431SAG-7 meets industry standards.
7.What is the process for return or replacement of AP431SAG-7?
All AP431SAG-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP431SAG-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 AP431SAG-7 part is unused and in its original packaging.
Return procedure for AP431SAG-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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