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Diodes Incorporated AP431QL-7
- Part No.:
- AP431QL-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP431QL-7.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT25
- Quantity:
- Payment:
- Shipping:
Inventory:2,315
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Product details
Overview
AP431QL-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 sets programmable output voltages from 2.495V to 36V using two external resistors - widely used in feedback loops of isolated DC-DC converters and voltage monitors.
For engineers reviewing the AP431QL-7 datasheet, AP431QL-7 pinout, AP431QL-7 application, or AP431QL-7 equivalent, key selection criteria include reference tolerance (±1%), cathode current range (0.19–250mA), temperature coefficient (30ppm/°C), and SOT25 package compatibility with space-constrained power supply designs.
Technical Context
The AP431QL-7 implements a bandgap-based precision reference with active output circuitry enabling sharp turn-on characteristics and low 0.2Ω dynamic impedance. Its internal architecture supports stable regulation down to 300μA minimum cathode current and maintains ±1% VREF accuracy across -20°C to +85°C.
It functions as a 2.495V reference-controlled shunt element, where cathode-anode voltage is set by an external resistor divider between REF and ANODE. The device exhibits low output noise and fast transient response, making it suitable for closed-loop feedback in flyback and forward converters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495V ±1% - enables fixed or programmable output without trim potentiometers |
| Sink Current Range | 0.19mA to 200mA - supports regulation across light-load standby and full-power operation |
| Dynamic Output Impedance | 0.2Ω typical - ensures minimal output voltage deviation under load transients |
| Temp Coefficient | 30ppm/°C - guarantees ≤±8mV VREF drift over full operating temperature range |
| Min Cathode Current | 0.19mA - allows stable regulation even in ultra-low-power feedback paths |
| Max Cathode Voltage | +36V - compatible with 24V industrial rails and 32V automotive inputs |
| Operating Temp | -20°C to +85°C - validated for extended commercial environments including industrial power supplies |
Pinout & Package
SOT25 package: 5-pin surface-mount package with exposed thermal pad; footprint optimized for thermal dissipation up to 550mW at +25°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Output current sink node | Connects to primary-side switch node or error amplifier output; carries full regulated current |
| Anode (Pin 2) | Return path for reference and cathode current | Typically tied to system ground or secondary-side common; completes regulation loop |
| REF (Pin 3) | Precision reference input | High-impedance node sensing divided output voltage; sets regulation threshold via R1/R2 divider |
| NC (Pin 4) | No connect | Internally unconnected; must remain floating or grounded per layout guidelines |
| NC (Pin 5) | No connect | Internally unconnected; no electrical function; avoid routing signals to this pin |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | Programmable from 2.495V to 36V using only two external resistors - eliminates need for multiple fixed-voltage regulators |
| Low reference current | 1.4µA typical IREF - minimizes divider network power loss and improves light-load efficiency |
| Sharp turn-on response | Fast cathode current activation at VREF crossing - enables clean regulation during startup and line transients |
| Lead-free & Halogen-free | RoHS-compliant SOT25 package with <900ppm Br/Cl and <1000ppm Sb - meets IPC-1752A environmental requirements |
| Stable with capacitive loads | Validated stability with ≥100nF output capacitance - simplifies EMI filter design in SMPS feedback paths |
Applications
| Isolated Flyback Converter Feedback | Voltage Monitor Circuit |
|---|---|
Use Scenario: Secondary-side voltage sensing in 5–24V isolated DC-DC converters with optocoupler-coupled feedback. IC Role / Device Role / Timing Role: Precision shunt reference generating error signal for optocoupler LED drive. Use Value: ±1% VREF tolerance ensures ±2% output voltage accuracy across line/load/temperature without trimming. |
Use Scenario: Dual-threshold detection for battery undervoltage/overvoltage alerts in portable equipment. IC Role / Device Role / Timing Role: Adjustable comparator reference node setting high/low trip points via resistor dividers. Use Value: 30ppm/°C tempco prevents false triggers across -20°C to +60°C battery operating range. |
| 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-regulated current source where cathode current equals VREF/RSET. Use Value: 0.2Ω dynamic impedance maintains <±0.5% current accuracy despite 10% input ripple. |
Use Scenario: Primary-side overvoltage shutdown in AC-DC adapters when output exceeds safe limit. IC Role / Device Role / Timing Role: Trigger element activating SCR gate when sensed voltage crosses programmed threshold. Use Value: Fast turn-on response (<1µs) ensures sub-cycle fault detection before downstream component damage. |
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 | ±0.5% VREF tolerance, SO-8 package, higher 100mA max cathode current | Requires larger PCB area; better suited for non-space-constrained designs needing tighter reference accuracy | Select when ±0.5% initial accuracy is mandatory and SOT25 footprint is not required |
| AS431ATZ | Same ±1% VREF, SC59 package, 0.25Ω typical ZKA, rated for -40°C to +105°C | Extended temperature range supports automotive under-hood use; slightly higher output impedance | Choose for industrial or automotive applications requiring operation below -20°C or above +85°C |
Compared with TL431BIDBZR and AS431ATZ, the AP431QL-7 offers optimal balance of SOT25 space efficiency, ±1% accuracy, and 0.2Ω impedance for cost-sensitive industrial power supplies - while TL431BIDBZR trades size for tighter tolerance and AS431ATZ extends temperature range at minor impedance penalty.
Availability
AP431QL-7 is available at Aetrix Electronics and suitable for isolated DC-DC converter feedback, voltage monitoring circuits, and constant-current sink applications requiring stable component supply and RoHS-compliant packaging.
Supply support for AP431QL-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 for power management, signal integrity, and protection applications.
The AP431/AP431A series was designed for precision voltage regulation in cost-sensitive power supply feedback paths, targeting industrial, consumer, and computing markets where reliability and small-footprint shunt regulation are critical.
FAQ
What is the maximum power dissipation of AP431QL-7 in SOT25 package?
The AP431QL-7 has a maximum power dissipation of 550mW at +25°C ambient temperature in the SOT25 package. Derating is required above +25°C at 6.2mW/°C, with junction temperature limited to +150°C. Thermal performance depends on PCB copper area and airflow.
Can AP431QL-7 replace a Zener diode directly in existing designs?
Yes - AP431QL-7 can directly replace Zener diodes in shunt regulator configurations, offering superior 2.495V ±1% reference accuracy, lower dynamic impedance (0.2Ω vs. typical Zener's 5–20Ω), and sharper turn-on. External resistor values must be recalculated to set the desired output voltage using VOUT = VREF × (1 + R1/R2).
Does AP431QL-7 require an external capacitor for stability?
No external capacitor is required for basic regulation, but a 100nF ceramic capacitor placed between REF and ANODE improves noise immunity and high-frequency stability. Larger capacitors (>1µF) may cause oscillation unless compensated per the stability boundary curves in the datasheet.
Is AP431QL-7 suitable for automotive applications?
AP431QL-7 is specified for -20°C to +85°C operation and is not qualified to AEC-Q101. For automotive under-hood use, Diodes Incorporated recommends AS431ATZ (rated -40°C to +105°C) or TL431 variants with automotive qualification. AP431QL-7 is appropriate for cabin or infotainment systems within its temperature range.
AP431QL-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
AP431QL-7 FAQ
1.How can I place an order for AP431QL-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP431QL-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 AP431QL-7 reliable?
The price and inventory of AP431QL-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP431QL-7 is usually 5 days.
3.What payment methods are accepted for AP431QL-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP431QL-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP431QL-7?
AP431QL-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP431QL-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 AP431QL-7?
For technical support, including AP431QL-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP431QL-7 requirements.
6.How does Aetrix verify that AP431QL-7 is sourced from the original manufacturer or authorized distributors?
All AP431QL-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 AP431QL-7 meets industry standards.
7.What is the process for return or replacement of AP431QL-7?
All AP431QL-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP431QL-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 AP431QL-7 part is unused and in its original packaging.
Return procedure for AP431QL-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AP431QL-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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