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Diodes Incorporated AP432QG-7
- Part No.:
- AP432QG-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP432QG-7.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT25
- Quantity:
- Payment:
- Shipping:
Inventory:4,201
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Product details
Overview
AP432QG-7 from Diodes Incorporated is a 3-terminal adjustable precision shunt regulator with ±1% reference voltage tolerance, 0.2Ω dynamic output impedance, and 200mA sink current capability. It operates over –20°C to +85°C, sets output voltage from 1.24V to 20V via external resistors, and replaces Zener diodes in feedback loops of AC/DC adapters, LED drivers, and voltage monitors.
For engineers reviewing the AP432QG-7 datasheet, AP432QG-7 pinout, AP432QG-7 application, or AP432QG-7 equivalent, key selection criteria include reference accuracy, cathode current headroom, temperature coefficient (30 ppm/°C), and SOT25 package thermal performance in space-constrained power regulation designs.
Technical Context
The AP432QG-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 active sink topology maintains stable VREF = 1.24V ±1% across load and temperature without external trimming.
Designed for closed-loop feedback in switching regulators and linear post-regulators, it supports programmable setpoints via resistor dividers while maintaining <0.3mA minimum cathode current for regulation - critical for low-power standby modes and crowbar protection circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24V ±1% - enables fixed or adjustable output without trim potentiometers, reducing BOM cost and drift. |
| Sink Current Capacity | 200mA - supports direct drive of optocoupler LEDs or error amplifier inputs in isolated flyback controllers. |
| Dynamic Output Impedance | 0.2Ω - ensures minimal output voltage deviation under fast load transients in voltage monitor or current limiter applications. |
| Temp Coefficient | 30 ppm/°C - guarantees ≤±3mV reference shift over full –20°C to +85°C range, suitable for industrial-grade power supplies. |
| Min Cathode Current | 150μA - allows stable regulation even in ultra-low-quiescent-current designs like battery-backed supervisors. |
| Max Cathode Voltage | 20V - permits use in 12V and 15V rail monitoring, overvoltage protection, and adjustable shunt-based LDOs. |
| Package Thermal Resistance | 182°C/W (SOT25) - limits junction rise to <36°C at 200mA sink with 25°C ambient, supporting continuous operation without heatsinking. |
Pinout & Package
AP432QG-7 is housed in a RoHS-compliant, lead-free SOT25 (SC-74A) surface-mount package with standard 5-pin footprint and 1.6mm × 2.8mm body size. The package supports reflow soldering per JEDEC J-STD-020 and provides adequate thermal dissipation for up to 550mW power handling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Cathode | Current Sink Terminal | Primary output node; connects to regulated rail or optocoupler anode; carries full load current up to 200mA. |
| 2 - Anode | Reference Ground Return | Low-impedance return path for reference amplifier; must be tied directly to system ground or feedback node common point. |
| 3 - Reference | Feedback Input | High-impedance input sensing divided-down output voltage; determines regulation setpoint via R1/R2 divider ratio. |
| 4 - Anode | Redundant Ground Return | Second anode terminal electrically tied internally to Pin 2; improves thermal conduction and reduces ground loop inductance. |
| 5 - NC | No Connect | Internally unconnected; must remain floating or grounded per layout best practices to avoid parasitic coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Precision reference voltage | 1.24V ±1% - eliminates need for manual calibration or external trimming in production test flows. |
| Low dynamic output impedance | 0.2Ω - maintains tight regulation during rapid load steps in SMPS feedback paths and current-sense amplifiers. |
| Programmable output range | 1.24V to 20V - supports single-part design across multiple output voltages using only two external resistors. |
| Fast turn-on response | Sub-microsecond activation - enables reliable overvoltage crowbar triggering and real-time fault detection. |
| Green and lead-free compliance | SOT25 package with halogen/antimony-free molding compound - meets IPC-1752a material declaration requirements. |
Applications
| AC/DC Adapter Feedback | LED Driver Current Regulation |
|---|---|
Use Scenario: Secondary-side voltage sensing in isolated flyback converters powering consumer electronics. IC Role / Device Role / Timing Role: Precision shunt reference providing optocoupler bias current and error signal to primary controller. Use Value: ±1% VREF and 30 ppm/°C TC ensure ±2% output voltage stability across line/load/temperature - meeting IEC 61347-1 requirements. |
Use Scenario: Constant-current sink for high-brightness LED strings in signage and architectural lighting. IC Role / Device Role / Timing Role: Adjustable shunt regulator setting LED current via sense-resistor feedback network. Use Value: 200mA sink capacity and 0.2Ω output impedance enable stable 350mA–700mA LED drive with <±3% current variation over 0–85°C. |
| Overvoltage Protection Circuit | Programmable Voltage Monitor |
Use Scenario: Crowbar-triggered shutdown in 12V automotive accessory modules during load-dump events. IC Role / Device Role / Timing Role: Adjustable threshold detector comparing battery rail to reference-derived trip point. Use Value: Programmable 13.8V–15.2V trip window with fast turn-on ensures sub-100ns response to transients exceeding ISO 7637-2 Pulse 5a. |
Use Scenario: Power-good signaling in FPGA or microcontroller power sequencing networks. IC Role / Device Role / Timing Role: Dual-threshold comparator reference source for undervoltage/overvoltage lockout logic. Use Value: Dual-resistor configuration enables independent high/low limit setting (e.g., 0.9×VIN/1.1×VIN) with <10mV hysteresis. |
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, 100μA min cathode current, 0.3Ω ZKA, SOT23-3 package | Lower quiescent current and tighter tolerance but reduced sink capacity (100mA); unsuitable for >150mA optocoupler drive. | Select AZ431L when reference accuracy and low-IQ outweigh current drive needs - e.g., battery-powered sensors. |
| TL431BIDBZR | ±0.5% VREF, 100mA sink, 0.22Ω ZKA, SOT23-3, higher temp range (–40°C to +125°C) | Higher operating temperature rating but lower max cathode voltage (36V vs 20V); requires different divider scaling for >20V rails. | Choose TL431BIDBZR for extended-temp industrial systems where 125°C operation is mandatory and voltage range permits. |
Compared with AZ431L and TL431BIDBZR, AP432QG-7 offers superior 200mA sink current and SOT25 thermal performance for high-power adapter feedback, while trading off tighter reference tolerance and extended temperature range - making it optimal for cost-sensitive commercial power supplies requiring robust current drive.
Availability
AP432QG-7 is available at Aetrix Electronics and suitable for AC/DC adapters, LED drivers, overvoltage protection circuits, and programmable voltage monitors requiring stable component supply with consistent parametric performance across production lots.
Supply support for AP432QG-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 AP432 series belongs to Diodes' precision reference product line, engineered specifically for high-accuracy, low-drift shunt regulation in cost-sensitive power conversion and monitoring applications where Zener replacement is required.
FAQ
What is the maximum recommended cathode current for continuous operation in AP432QG-7?
The AP432QG-7 supports up to 200mA continuous cathode current when mounted on a standard 2-layer PCB with 1-inch² copper pour per pin. Derating is required above 70°C ambient; at 85°C, maximum safe current drops to 165mA to maintain junction temperature below 150°C. Power dissipation must not exceed 550mW, corresponding to 2.75V × 200mA at worst-case VKA.
Can AP432QG-7 replace a standard 3.3V Zener diode in a voltage clamp circuit?
Yes - AP432QG-7 can replace a 3.3V Zener by configuring R1 and R2 to set VOUT = 3.3V using VREF = 1.24V. For example, R1 = 10kΩ and R2 = 6.02kΩ yields 3.3V with <0.2% error. Unlike Zeners, it draws only 150μA minimum current and exhibits 0.2Ω dynamic impedance, resulting in tighter clamping and lower leakage at sub-threshold voltages.
Does AP432QG-7 require external compensation for stability in feedback loops?
No external compensation is needed for basic shunt regulator operation. However, when used in high-gain error amplifier configurations (e.g., with optocouplers), stability depends on output capacitance and divider impedance. The datasheet defines stability boundaries: for 10mA cathode current and VKA = 5V, CL must stay below 10nF. Layout best practices include short traces to REF and local 100nF ceramic bypass near cathode/anode pins.
Is AP432QG-7 suitable for automotive applications per AEC-Q200?
No - AP432QG-7 is not AEC-Q200 qualified. Its specified operating temperature range is –20°C to +85°C, and it lacks automotive-grade qualification testing (e.g., HTOL, TCT, ESD). For automotive use, Diodes recommends the AEC-Q101-qualified AZ431L or TL431 variants with –40°C to +125°C rating and PPAP documentation support.
AP432QG-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:
- ±1%
- 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
AP432QG-7 FAQ
1.How can I place an order for AP432QG-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP432QG-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 AP432QG-7 reliable?
The price and inventory of AP432QG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP432QG-7 is usually 5 days.
3.What payment methods are accepted for AP432QG-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP432QG-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP432QG-7?
AP432QG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP432QG-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 AP432QG-7?
For technical support, including AP432QG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP432QG-7 requirements.
6.How does Aetrix verify that AP432QG-7 is sourced from the original manufacturer or authorized distributors?
All AP432QG-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 AP432QG-7 meets industry standards.
7.What is the process for return or replacement of AP432QG-7?
All AP432QG-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP432QG-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 AP432QG-7 part is unused and in its original packaging.
Return procedure for AP432QG-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AP432QG-7 Tags
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TL431AIDBZR
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TL431BQDBZR
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AN431AN-ATRG1
Diodes Incorporated
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LM4040CYM3-4.1-TR
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LM4040EIM3-2.5/NOPB
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AZ431LBNTR-G1
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LM4040D20IDBZR
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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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