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Diodes Incorporated AP431RG-7
- Part No.:
- AP431RG-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- -
- Datasheet:
-
AP431RG-7.pdf
- Description:
- IC VREF SHUNT ADJ SC59
- Quantity:
- Payment:
- Shipping:
Inventory:4,629
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Product details
Overview
AP431RG-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 over –20°C to +85°C and supports programmable output voltages from 2.495V to 36V using two external resistors - widely deployed in feedback loops of AC/DC adapters, LED drivers, and voltage monitors.
For engineers reviewing the AP431RG-7 datasheet, AP431RG-7 pinout, AP431RG-7 application, or AP431RG-7 equivalent, this device serves as a Zener diode replacement in precision voltage regulation, overvoltage protection, and constant-current sink circuits where tight reference tolerance, low temperature drift (30ppm/°C), and sharp turn-on response are critical.
Technical Context
The AP431RG-7 implements an internal bandgap reference and high-gain transconductance amplifier driving an NPN output stage, enabling precise cathode-to-reference voltage regulation via external resistor divider feedback. Its active output circuitry delivers fast turn-on response and low dynamic impedance independent of load current variation.
It functions as a 3-terminal programmable shunt regulator: cathode sinks current when reference terminal voltage exceeds 2.495V, with regulation maintained down to 300μA minimum cathode current. The device exhibits <20mV reference deviation across full temperature range and <3.5μA reference input current at 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495V ±1% - sets regulated output threshold with minimal calibration need |
| Dynamic Output Impedance | 0.2Ω - ensures stable regulation under fast load transients |
| Sink Current Capability | 200mA - supports medium-power feedback and protection circuits |
| Min Cathode Current | 300μA - enables low-power operation without dropout |
| Temp Coefficient | 30ppm/°C - maintains accuracy across industrial temperature range |
| Output Voltage Range | 2.495V to 36V - programmable via external R1/R2 divider |
| Operating Temp Range | –20°C to +85°C - suitable for commercial and industrial power supplies |
Pinout & Package
AP431RG-7 is packaged in SC59R - a 3-pin, lead-free, RoHS-compliant surface-mount package with gull-wing leads and 1.6mm body width. Pin 1 = Anode, Pin 2 = Reference, Pin 3 = Cathode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Anode) | Anode connection | Common return path for cathode current; tied to system ground or low-side rail |
| Pin 2 (Reference) | Feedback input | Senses divided output voltage; regulates when ≥2.495V relative to cathode |
| Pin 3 (Cathode) | Current sink output | Draws current to maintain reference voltage condition; connects to error amplifier or pass element |
Key Features
| Feature | Design Value |
|---|---|
| Precision reference voltage | 2.495V ±1% - eliminates need for trimmer potentiometers in production designs |
| Low dynamic output impedance | 0.2Ω - minimizes output voltage shift during load steps |
| Sharp turn-on response | Sub-microsecond rise time - improves transient immunity in protection circuits |
| Programmable output range | 2.495V–36V - single part replaces multiple Zener diodes across voltage tiers |
| Lead-free & halogen-free | RoHS 2 and "Green" compliant - meets global environmental compliance requirements |
Applications
| Voltage Monitor | Constant-Current Sink |
|---|---|
|
Use Scenario: Detecting overvoltage/undervoltage conditions in DC power rails using dual-resistor dividers. IC Role / Device Role / Timing Role: Shunt regulator acting as precision comparator with hysteresis via external resistors. Use Value: Enables ±1% trip-point accuracy without trimming, supporting reliable brown-out and overvoltage lockout. |
Use Scenario: Providing stable bias current for laser diodes or sensor excitation in portable instrumentation. IC Role / Device Role / Timing Role: Adjustable current sink referenced to internal 2.495V bandgap. Use Value: Delivers 10mA–200mA sink current with <30ppm/°C drift, eliminating external current-sense resistors. |
| AC/DC Feedback Regulator | Crowbar Overvoltage Protection |
|
Use Scenario: Secondary-side voltage sensing in isolated flyback converters to regulate output via optocoupler feedback. IC Role / Device Role / Timing Role: Precision shunt reference controlling optocoupler LED current in feedback loop. Use Value: Maintains ±1% output regulation across line/load/temperature with minimal component count. |
Use Scenario: Triggering SCR-based crowbar circuits when output exceeds safe threshold in lab power supplies. IC Role / Device Role / Timing Role: Fast-turn-on shunt regulator driving gate of thyristor via series resistor. Use Value: Sub-10μs response ensures immediate short-circuit activation before downstream damage occurs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431BIDBZR | 2.495V ±0.5%, SO-8 package, higher 100mA max cathode current, 0.22Ω impedance | Requires larger footprint; lower max current limits use in high-power crowbar circuits | Preferred where tighter reference tolerance (±0.5%) justifies SO-8 layout impact and cost premium |
| AS431ARTDT-13 | 2.495V ±1%, SOT23-3 package, 100mA sink current, 0.3Ω impedance, -40°C to +105°C rating | Wider temp range but lower current and higher impedance; not drop-in compatible due to different pinout | Chosen for extended temperature designs where SC59R footprint is unavailable and 100mA suffices |
Compared with TL431BIDBZR and AS431ARTDT-13, AP431RG-7 offers optimal balance of 200mA sink capability, SC59R compactness, and industrial temperature support - making it ideal for space-constrained AC/DC feedback and protection circuits requiring robust current handling without SO-8 real estate.
Availability
AP431RG-7 is available at Aetrix Electronics and suitable for AC/DC adapter feedback loops, LED driver current regulation, and overvoltage protection circuits requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.
Supply support for AP431RG-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 delivers precision shunt regulation for feedback, monitoring, and protection applications - designed specifically to replace Zener diodes with superior stability, accuracy, and thermal performance.
FAQ
What is the minimum cathode current required for regulation in AP431RG-7?
The AP431RG-7 requires a minimum cathode current of 300μA to maintain regulation, verified per DS31002 Rev. 21–2 electrical characteristics table. This value ensures stable reference operation even in ultra-low-power feedback paths, such as those found in battery-powered voltage monitors or standby-mode power supplies.
Can AP431RG-7 be used as a standalone voltage reference without external resistors?
No - AP431RG-7 is a 3-terminal shunt regulator, not a 2-terminal reference. It requires external resistors to set output voltage; however, connecting REF directly to CATHODE yields a fixed 2.495V shunt, provided anode is grounded and cathode current remains ≥300μA. This configuration is documented in Figure 1 of the datasheet.
Is AP431RG-7 pin-compatible with TL431 in SC59R footprint?
No - TL431 is not offered in SC59R. Standard TL431 packages include TO-92, SO-8, and SOT-23, all with different pinouts. AP431RG-7's SC59R pin 1=Anode, pin 2=REF, pin 3=Cathode differs from TL431's SOT-23 assignment (pin 1=Cathode, pin 2=Anode, pin 3=REF), preventing direct substitution without PCB redesign.
Does AP431RG-7 support operation above 85°C ambient temperature?
No - the specified operating temperature range is –20°C to +85°C ambient. While absolute maximum storage temperature reaches +150°C, sustained operation beyond +85°C ambient violates the qualified operating conditions in DS31002 and risks parametric shift, including increased reference deviation and reduced reliability per JEDEC JESD22-A108.
AP431RG-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- -
- Series:
- *
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Reference Type:
- -
- Output Type:
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Tolerance:
- -
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
AP431RG-7 FAQ
1.How can I place an order for AP431RG-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP431RG-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 AP431RG-7 reliable?
The price and inventory of AP431RG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP431RG-7 is usually 5 days.
3.What payment methods are accepted for AP431RG-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP431RG-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP431RG-7?
AP431RG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP431RG-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 AP431RG-7?
For technical support, including AP431RG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP431RG-7 requirements.
6.How does Aetrix verify that AP431RG-7 is sourced from the original manufacturer or authorized distributors?
All AP431RG-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 AP431RG-7 meets industry standards.
7.What is the process for return or replacement of AP431RG-7?
All AP431RG-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP431RG-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 AP431RG-7 part is unused and in its original packaging.
Return procedure for AP431RG-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AP431RG-7 Tags
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TL431AIDBZR
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TL431BQDBZR
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AN431AN-ATRG1
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LM4040EIM3-2.5/NOPB
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AZ431LBNTR-G1
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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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