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Diodes Incorporated AP432AQG-7
- Part No.:
- AP432AQG-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP432AQG-7.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT25
- Quantity:
- Payment:
- Shipping:
Inventory:1,334
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Product details
Overview
AP432AQG-7 from Diodes Incorporated is a 3-terminal adjustable precision shunt regulator with ±0.5% reference voltage tolerance, 1.24 V nominal VREF, and guaranteed stable operation from −20°C to +85°C. It sinks up to 200 mA, features 0.2 Ω dynamic output impedance, and sets programmable output voltages from 1.24 V to 20 V using two external resistors - widely deployed in feedback loops of AC/DC adapters, LED drivers, and voltage monitors.
For engineers reviewing the AP432AQG-7 datasheet, AP432AQG-7 pinout, AP432AQG-7 application, or AP432AQG-7 equivalent, key selection criteria include reference accuracy (±0.5%), cathode current capability (200 mA), minimum regulation current (150 µA), temperature coefficient (30 ppm/°C), and SOT25 package compatibility with standard PCB layout practices.
Technical Context
The AP432AQG-7 implements an internal bandgap reference and high-gain error amplifier driving an NPN output stage, enabling sharp turn-on and low-output-impedance regulation. Its reference input (REF) senses a divided fraction of cathode-to-anode voltage, while the cathode (C) serves as the regulated output node and anode (A) connects to system ground or return path.
It operates as a 3-terminal programmable shunt: cathode sinks current when VKA exceeds VREF × (1 + R1/R2); regulation begins at just 150 µA cathode current and sustains stability across 100 nF–10 µF load capacitance depending on operating point - confirmed via manufacturer-provided stability boundary curves.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF Tolerance | ±0.5% - enables fixed-output regulation without trimming potentiometers, reducing BOM cost and long-term drift. |
| Reference Voltage | 1.24 V (typical) - sets minimum programmable output; actual range spans 1.233 V to 1.246 V at 25°C. |
| Cathode Current | 200 mA max - supports medium-power shunt regulation in offline SMPS feedback or overvoltage crowbar circuits. |
| Dynamic Impedance | 0.2 Ω (typical) - ensures tight output regulation under fast load transients; critical for ripple-sensitive applications. |
| Temp Coefficient | 30 ppm/°C - guarantees ≤20 mV total VREF deviation across −20°C to +85°C, suitable for industrial ambient. |
| Min Cathode Current | 150 µA - allows stable regulation even in ultra-low-power bias networks or high-resistance divider configurations. |
| Output Voltage Range | 1.24 V to 20 V - set by external R1/R2 divider; no internal voltage limit beyond cathode absolute max (20 V). |
Pinout & Package
SOT25 package: 5-pin surface-mount outline with exposed thermal pad; pin 1 = Cathode, pin 2 = Anode, pin 3 = REF, pins 4–5 = NC (no connect). Designed for high thermal efficiency in space-constrained power supplies.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Regulated Output Node | Sinks current to maintain programmed VOUT; connects to feedback node of isolated DC/DC converter or LED string cathode. |
| 2 (Anode) | Ground Reference Terminal | Return path for cathode current; must be low-impedance connection to system ground or power return plane. |
| 3 (REF) | Reference Input | High-impedance sense input for resistor divider; draws only 1.4–3.5 µA, minimizing divider power loss. |
| 4, 5 (NC) | No Connect | Unbonded terminals; must remain unconnected and unstubbed on PCB to avoid parasitic coupling or EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Precision reference voltage | 1.24 V ± 0.5% - eliminates need for post-production calibration or trimmer resistors in production-grade power supplies. |
| Low dynamic output impedance | 0.2 Ω - maintains <10 mV output deviation during 100 mA step loads, improving transient response in closed-loop systems. |
| Programmable output voltage | 1.24 V to 20 V - achieved with passive R1/R2 network; supports wide-range output scaling without changing IC. |
| Fast turn-on response | Sub-microsecond activation - enables rapid fault detection in overvoltage protection circuits and crowbar triggers. |
| Lead-free & halogen-free | SOT25 package with RoHS-compliant finish and "Green" molding compound - meets IPC/JEDEC J-STD-020 moisture sensitivity level 1. |
Applications
| AC/DC Adapter Feedback | LED Constant-Current Sink |
|---|---|
|
Use Scenario: Secondary-side voltage sensing in isolated flyback converters powering consumer electronics. IC Role / Device Role / Timing Role: Shunt regulator providing precise reference to optocoupler input, closing primary-side PWM loop. Use Value: ±0.5% VREF ensures ±1.5% output voltage accuracy across line/load/temperature, meeting ENERGY STAR® standby requirements. |
Use Scenario: High-efficiency constant-current driver for mid-power white LED arrays in signage and lighting. IC Role / Device Role / Timing Role: Cathode-connected shunt regulating current through series LED string via sense resistor feedback. Use Value: 200 mA sink capacity and 0.2 Ω impedance enable stable 350 mA LED current with <±2% variation over 0–70°C ambient. |
| Overvoltage Protection | Programmable Voltage Monitor |
|
Use Scenario: Crowbar circuit triggering thyristor discharge when input rail exceeds safe threshold in industrial power modules. IC Role / Device Role / Timing Role: Precision shunt comparing scaled input voltage against VREF; drives SCR gate upon overvoltage event. Use Value: 30 ppm/°C tempco ensures trip point drift remains <±0.3 V from −20°C to +85°C, preventing nuisance tripping. |
Use Scenario: Dual-threshold UVLO/OVLO detection for battery management in portable medical devices. IC Role / Device Role / Timing Role: Configured with dual resistor dividers to assert logic-level flags when battery voltage falls below 3.0 V or rises above 4.3 V. Use Value: Independent high- and low-limit thresholds set with <1% absolute error, enabling reliable state-of-charge windowing without microcontroller intervention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AZ431L | ±0.5% VREF, 1.24 V, but rated for only 100 mA cathode current and 15 ppm/°C tempco. | Limited to lower-power feedback or monitoring; insufficient for >150 mA crowbar or LED sink roles. | Select AZ431L only when thermal budget is constrained and cathode current stays below 100 mA. |
| TL431BIDBZR | ±0.5% VREF, 1.24 V, 100 mA max cathode current, SO-8 package, higher 0.35 Ω output impedance. | Requires larger footprint; less effective in high-transient applications due to higher ZKA. | Prefer TL431BIDBZR only if SO-8 mounting is required and thermal derating to 80 mA is acceptable. |
Compared with AZ431L and TL431BIDBZR, the AP432AQG-7 delivers 2× higher cathode current (200 mA vs. ≤100 mA), 25% lower dynamic impedance (0.2 Ω vs. ≥0.35 Ω), and SOT25's superior thermal resistance (190°C/W vs. SO-8's 220°C/W), making it optimal for compact, high-reliability shunt regulation where power density matters.
Availability
AP432AQG-7 is available at Aetrix Electronics and suitable for AC/DC adapter feedback, LED constant-current sink, and overvoltage protection requiring stable component supply, RoHS compliance, and SOT25 footprint compatibility.
Supply support for AP432AQG-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 solutions for power management, signal integrity, and connectivity applications.
The AP432/AP432A product line targets precision voltage regulation in cost-sensitive, space-constrained power systems - designed specifically to replace Zener diodes with tighter tolerance, lower impedance, and improved thermal stability.
FAQ
What is the maximum cathode voltage rating for AP432AQG-7?
The absolute maximum cathode voltage is 20 V, as specified in the Absolute Maximum Ratings table. Exceeding this value risks permanent damage to the internal reference and output transistor. Designers must ensure that the cathode-to-anode voltage never surpasses 20 V under any operating condition, including transient surges or startup overshoot.
Can AP432AQG-7 be used in place of a Zener diode in all cases?
No - while AP432AQG-7 replaces Zeners in most precision shunt applications, it requires ≥150 µA minimum cathode current to regulate and cannot operate in true zero-current "open-circuit" mode like a passive Zener. Applications with intermittent or microamp-level bias currents must verify continuous conduction or add bleed resistors.
Does AP432AQG-7 require external compensation for stability?
No external compensation is needed for basic shunt regulation, but stability depends on load capacitance and cathode current. Manufacturer-provided stability boundary curves show safe CL–IKA operating regions; for example, 10 µF capacitors are stable only above ~50 mA cathode current in SOT25 configuration.
Is AP432AQG-7 pin-compatible with other AP432 variants in SOT25?
Yes - all AP432 and AP432A variants in SOT25 (e.g., AP432QL-7, AP432QG-7, AP432AQG-7) share identical pinout (Cathode–Anode–REF–NC–NC), thermal pad layout, and mechanical dimensions; only reference tolerance (±1% vs. ±0.5%) and RoHS/green status differ between part numbers.
AP432AQG-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):
- 1.24V
- Voltage - Output (Max):
- 20 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:
- 300 µA
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-25
AP432AQG-7 FAQ
1.How can I place an order for AP432AQG-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP432AQG-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 AP432AQG-7 reliable?
The price and inventory of AP432AQG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP432AQG-7 is usually 5 days.
3.What payment methods are accepted for AP432AQG-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP432AQG-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP432AQG-7?
AP432AQG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP432AQG-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 AP432AQG-7?
For technical support, including AP432AQG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP432AQG-7 requirements.
6.How does Aetrix verify that AP432AQG-7 is sourced from the original manufacturer or authorized distributors?
All AP432AQG-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 AP432AQG-7 meets industry standards.
7.What is the process for return or replacement of AP432AQG-7?
All AP432AQG-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP432AQG-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 AP432AQG-7 part is unused and in its original packaging.
Return procedure for AP432AQG-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AP432AQG-7 Tags
-
TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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AN431AN-ATRG1
Diodes Incorporated
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LM4040CYM3-2.5-TR
Microchip Technology
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LM4040CYM3-4.1-TR
Microchip Technology
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LM4040EIM3-2.5/NOPB
Texas Instruments
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AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
Texas Instruments
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LM4041DIM3-ADJ/NOPB
Texas Instruments
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LM4040DIM3X-2.5/NOPB
Texas Instruments
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LM4040DIM3-2.5/NOPB
Texas Instruments
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AZ431LANTR-G1
Diodes Incorporated
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