My Inquiry
My Account
Diodes Incorporated AP431QG-7
- Part No.:
- AP431QG-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP431QG-7.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT25
- Quantity:
- Payment:
- Shipping:
Inventory:4,804
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AP431QG-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 2.495V to 36V output via external resistor divider, supports -20°C to +85°C ambient, and replaces Zener diodes in feedback loops of AC/DC adapters and voltage monitors.
For engineers reviewing the AP431QG-7 datasheet, AP431QG-7 pinout, AP431QG-7 application, or AP431QG-7 equivalent, this device is selected for precision voltage regulation where tight reference tolerance, low temperature drift (30ppm/°C), sharp turn-on response, and SOT25 package compatibility are required in power supply feedback paths.
Technical Context
The AP431QG-7 implements an internal bandgap reference with active output circuitry enabling fast turn-on and low dynamic impedance. Its reference input current remains stable at 1.4–3.5µA across temperature, and cathode regulation initiates at just 300µA minimum current.
It functions as a programmable shunt element: cathode-anode voltage is set by R1/R2 ratio per VOUT = VREF(1 + R1/R2), while maintaining <±1mV/V cathode voltage sensitivity and <20mV total reference deviation over full operating temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495V ±1% - enables fixed or adjustable regulation without trim potentiometers in cost-sensitive designs |
| Sink Current Capability | 200mA - supports direct shunt control of medium-power feedback circuits without external pass transistors |
| Dynamic Output Impedance | 0.2Ω - ensures minimal output voltage shift under load transients in closed-loop regulation |
| Min Cathode Current | 300μA - allows stable regulation even in ultra-low-quiescent-current standby modes |
| Temp Coefficient | 30ppm/°C - guarantees ≤±8mV reference drift over -20°C to +85°C, critical for industrial-grade accuracy |
| Output Voltage Range | 2.495V to 36V - covers standard 3.3V, 5V, 12V, 24V, and 36V rails using only two external resistors |
| Off-State Current | 0.1–1.0μA at 36V - minimizes leakage-induced error in high-impedance sensing networks |
Pinout & Package
SOT25 package: 5-pin surface-mount outline with exposed thermal pad; RoHS-compliant, halogen-free "Green" molding compound; 3000 pcs/reel tape-and-reel packaging.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Current sink node | Connects to regulated output rail; carries full load current in shunt configuration |
| Anode (Pin 2) | Return path | Typically tied to system ground or negative rail; completes regulation loop |
| REF (Pin 3) | Reference input | High-impedance node sensing voltage divider midpoint; sets regulation threshold |
| NC (Pin 4) | No connect | Internally unconnected; must be left floating or grounded per layout best practice |
| NC (Pin 5) | No connect | Internally unconnected; no electrical function; avoid routing signals to this pin |
Key Features
| Feature | Design Value |
|---|---|
| Precision reference voltage tolerance | ±1% at 25°C - eliminates need for post-production calibration in mid-tier power supplies |
| Low dynamic output impedance | 0.2Ω - maintains regulation stability under rapid load steps without added compensation |
| Sharp turn-on response | Sub-microsecond rise time - prevents overshoot during startup or fault recovery in SMPS feedback |
| Programmable output voltage | 2.495V–36V via R1/R2 - enables single BOM part to support multiple output voltages across product families |
| Extended temperature operation | -20°C to +85°C - validated for use in industrial and telecom power modules without derating |
Applications
| AC/DC Adapter Feedback | Voltage Monitor Circuit |
|---|---|
|
Use Scenario: Regulating 5V/12V outputs in offline flyback converters with optocoupler-coupled feedback. IC Role / Device Role / Timing Role: Shunt regulator providing precise reference for optocoupler LED drive current, directly controlling primary-side PWM duty cycle. Use Value: ±1% reference tolerance ensures output stays within ±3% over line/load/temperature, meeting Class II safety standards. |
Use Scenario: Detecting overvoltage and undervoltage conditions on a 24V DC bus in PLC I/O modules. IC Role / Device Role / Timing Role: Adjustable comparator threshold generator using REF pin to set trip points via resistor dividers. Use Value: 30ppm/°C tempco ensures trip thresholds remain stable across -20°C to +70°C industrial ambient range. |
| Constant-Current Sink | Crowbar Overvoltage Protection |
|
Use Scenario: Providing stable 200mA bias current for laser diodes in fiber-optic transceivers. IC Role / Device Role / Timing Role: Precision shunt element sinking fixed current through RS resistor, independent of supply variation. Use Value: 0.2Ω output impedance limits current error to <0.5% across 10–100mA range, ensuring optical power stability. |
Use Scenario: Triggering SCR-based crowbar on 48V telecom power systems exceeding 52V threshold. IC Role / Device Role / Timing Role: High-accuracy voltage sense node driving gate of thyristor via transistor buffer when VIN > VREF(1+R1/R2). Use Value: 2.495V ±1% reference enables ±0.5V absolute trip accuracy at 52V, preventing false triggering during transients. |
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, 100mA max sink current, 0.22Ω impedance | Limited to lower current applications; requires larger PCB area than SOT25 | Select when tighter initial tolerance (±0.5%) is mandatory and current demand ≤100mA |
| AS431AZTR-E1 | 2.495V ±1%, SOT23-3, 100mA sink, 0.3Ω impedance, not recommended for new design | Smaller footprint but lower current rating and higher output impedance | Acceptable only for legacy redesigns where SOT23-3 board space is constrained and 100mA suffices |
Compared with TL431BIDBZR and AS431AZTR-E1, AP431QG-7 delivers 200mA sink capability in compact SOT25 while maintaining ±1% tolerance and 0.2Ω impedance-making it optimal for next-generation 12–24V industrial PSUs requiring higher shunt current and thermal efficiency.
Availability
AP431QG-7 is available at Aetrix Electronics and suitable for AC/DC adapter feedback, voltage monitor circuits, and constant-current sink applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for AP431QG-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 semiconductor company specializing in discrete, analog, and mixed-signal devices, with emphasis on power management, signal integrity, and protection solutions.
The AP431/AP431A series belongs to Diodes' precision reference product line, designed specifically for high-accuracy shunt regulation in cost-sensitive power supply feedback, voltage monitoring, and current-setting applications.
FAQ
What is the maximum cathode voltage rating for AP431QG-7?
The absolute maximum cathode voltage is +36V. Exceeding this value risks permanent damage to the internal reference and output stage. This rating applies across the full operating temperature range (-20°C to +85°C) and is verified per DS31002 Rev. 21-2 Section 5.
Can AP431QG-7 operate with less than 300μA cathode current?
No-regulation is not guaranteed below 300μA minimum cathode current. At currents near or below this threshold, output voltage deviates significantly from VREF(1 + R1/R2); datasheet Figure 1 confirms unstable regulation onset below 0.19mA at 25°C.
Is AP431QG-7 pin-compatible with TL431 in SOT25?
No-TL431 is not offered in SOT25. Standard TL431 packages are TO-92, SO-8, and SOT-23-3; AP431QG-7's SOT25 pinout (Cathode-Anode-REF-NC-NC) has no direct TL431 counterpart and requires PCB layout revision.
Does AP431QG-7 require external compensation for stability?
Stability depends on output capacitance and load conditions. Datasheet Figure 9 shows oscillation boundaries: for 10mA cathode current, CL >100nF with RS <150Ω typically ensures stability; larger capacitors may require series resistance per AN78 application note.
AP431QG-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- SC-74A, SOT-753
- 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-25
AP431QG-7 FAQ
1.How can I place an order for AP431QG-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP431QG-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 AP431QG-7 reliable?
The price and inventory of AP431QG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP431QG-7 is usually 5 days.
3.What payment methods are accepted for AP431QG-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP431QG-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP431QG-7?
AP431QG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP431QG-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 AP431QG-7?
For technical support, including AP431QG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP431QG-7 requirements.
6.How does Aetrix verify that AP431QG-7 is sourced from the original manufacturer or authorized distributors?
All AP431QG-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 AP431QG-7 meets industry standards.
7.What is the process for return or replacement of AP431QG-7?
All AP431QG-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP431QG-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 AP431QG-7 part is unused and in its original packaging.
Return procedure for AP431QG-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AP431QG-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…
