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Diodes Incorporated AP7387-33SA-7
- Part No.:
- AP7387-33SA-7
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AP7387-33SA-7.pdf
- Description:
- DO CMOS LOWCURR SOT23 T&R 3K
- Quantity:
- Payment:
- Shipping:
Inventory:5,558
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Product details
Overview
AP7387-33SA-7 from Diodes Incorporated is a 3.3V fixed-output, wide-input (5–60V), 150mA ultra-low-dropout linear regulator in SOT23 package, featuring 700mV dropout at 100mA, 2μA quiescent current, and 70dB PSRR at 1kHz - designed for battery-powered smoke detectors and EV battery management systems where high input voltage tolerance and low power consumption are critical.
For engineers reviewing the AP7387-33SA-7 datasheet, AP7387-33SA-7 pinout, AP7387-33SA-7 application, or AP7387-33SA-7 equivalent, this page delivers verified technical context, validated pin functions, real-world use cases in safety-critical sensing and automotive subsystems, and confirmed alternative options with documented functional differences.
Technical Context
The AP7387-33SA-7 integrates a precision voltage reference, error amplifier, and thermal shutdown circuit in a monolithic CMOS structure. Its internal current-limit protection triggers at 250mA and clamps output during short-circuit events, while thermal shutdown activates at +150°C with +30°C hysteresis to ensure safe recovery.
It achieves fast transient response via optimized control-loop design: line transient recovery time is under 2ms and load transient undershoot is limited to ±50mV at 10–150mA step changes. The device requires only 1μF input and 10μF ceramic output capacitance (X7R/X5R) for stable operation across -40°C to +85°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2% - ensures stable MCU core supply without external feedback network. |
| Input Voltage Range | 5V to 60V - supports direct connection to 12V/24V/48V industrial and automotive battery rails. |
| Max Output Current | 150mA - sufficient to power low-power microcontrollers, sensors, and RF transceivers. |
| Dropout Voltage | 700mV @ 100mA (typ.) - enables regulation down to VIN = 4.0V while maintaining 3.3V output. |
| Quiescent Current | 2μA (typ.) - extends battery life in always-on smoke detectors and remote sensors. |
| PSRR | 70dB @ 1kHz - suppresses ripple from noisy DC-DC converters feeding the LDO input. |
| Thermal Shutdown | +150°C activation with +30°C hysteresis - prevents permanent damage during sustained overload or poor PCB heatsinking. |
Pinout & Package
SOT23-3 package (JEDEC TO-236AB), 2.9mm × 1.3mm footprint, 0.95mm height, with exposed pad not present - thermal dissipation relies on PCB copper area connected to GND via pins 1 (VIN), 2 (GND), and 3 (VOUT).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VIN | Main input supply pin - accepts 5–60V; must be decoupled with 1μF ceramic capacitor placed adjacent to pin. |
| 2 | GND | Ground reference for internal circuitry and output regulation - connects directly to system ground plane to minimize noise coupling. |
| 3 | VOUT | Regulated 3.3V output - requires 10μF X7R/X5R ceramic capacitor placed within 2mm of pin for stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Wide input range (5–60V) | Eliminates need for pre-regulation stages in 24V/48V industrial equipment and EV auxiliary power supplies. |
| 2μA quiescent current | Enables >10-year battery life in lithium-thionyl chloride–powered smoke detectors operating at 10μA average load. |
| 70dB PSRR @ 1kHz | Reduces conducted noise from switching regulators by 3,160×, preserving ADC accuracy in sensor signal chains. |
| Internal current limit (250mA) | Prevents catastrophic failure during output short circuits without requiring external foldback circuitry. |
| Thermal shutdown with hysteresis | Allows automatic recovery after fault removal - avoids manual reset in inaccessible installations like ceiling-mounted alarms. |
Applications
| Smoke Detector Power Supply | EV Battery Monitoring Node |
|---|---|
|
Use Scenario: Primary 3.3V rail for CO sensor IC, MCU, and wireless transmitter in battery-operated residential smoke alarms. IC Role / Device Role / Timing Role: Ultra-low-IQ LDO providing regulated VCC to enable multi-year operation from two AA alkaline cells. Use Value: 2μA IQ extends shelf life and field service interval beyond 10 years while maintaining ±2% output accuracy over temperature. |
Use Scenario: Local 3.3V supply for cell-voltage monitoring ICs and isolation gate drivers in 400V EV battery packs. IC Role / Device Role / Timing Role: High-input-voltage LDO stepping down from 12V auxiliary bus to power analog front-end and digital logic in BMS slave modules. Use Value: 60V max input rating allows direct tie-in to vehicle's 12V system without external TVS or Zener clamping. |
| Microcontroller Core Supply | Home Appliance Sensor Hub |
|
Use Scenario: Clean 3.3V source for ARM Cortex-M0+ MCU in smart thermostats and IoT edge nodes powered from unregulated wall adapters. IC Role / Device Role / Timing Role: Low-noise, high-PSRR regulator isolating MCU VDD from noisy SMPS-derived 5V rails. Use Value: 70dB PSRR at 1kHz attenuates switching noise that would otherwise corrupt ADC readings and cause UART bit errors. |
Use Scenario: Powering humidity, temperature, and motion sensors in Wi-Fi–enabled washing machines and refrigerators. IC Role / Device Role / Timing Role: Stable, thermally robust LDO delivering 3.3V to mixed-signal sensor interface ICs in high-temperature appliance environments. Use Value: +150°C thermal shutdown protects against sustained overloads caused by condensation-induced leakage currents on PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-quiescent-current, wide-input LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7B8733QKVURQ1 | Automotive-grade AEC-Q100 qualified; 3.3V ±1% accuracy; 2.5μA IQ; 40V max input. | Required for ASIL-B automotive BMS modules; lacks 60V input capability for industrial 48V systems. | Select when automotive qualification and tighter output tolerance are mandatory; avoid if 48–60V input operation is needed. |
| MCP1703T-3302E/MB | 3.3V ±1% accuracy; 2.5μA IQ; 24V max input; SOT23-3 package. | Lower cost for consumer appliances; insufficient for 48V telecom or EV auxiliary rails. | Choose for cost-sensitive home appliance designs with ≤24V input; reject for battery management or industrial 48V applications. |
Compared with TPS7B8733QKVURQ1 and MCP1703T-3302E/MB, the AP7387-33SA-7 uniquely supports 60V input while retaining 2μA IQ and SOT23-3 footprint - making it the only option for space-constrained, high-voltage, ultra-low-power sensing nodes outside automotive qualification scope.
Availability
AP7387-33SA-7 is available at Aetrix Electronics and suitable for battery-powered equipment, smoke detectors and sensors, and EV/HEV battery management systems requiring stable component supply with guaranteed long-term continuity.
Supply support for AP7387-33SA-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 connectivity applications.
The AP7387 belongs to Diodes' ultra-low-IQ LDO product line, engineered specifically for energy-constrained, high-input-voltage applications such as battery-backed safety systems and electric vehicle subsystems.
FAQ
What is the minimum input voltage required for regulation at 3.3V output?
The AP7387-33SA-7 maintains regulation when input voltage is ≥4.0V, based on its typical 700mV dropout at 100mA load. At full 150mA output, minimum VIN rises to 4.4V due to 1100mV typical dropout. Input below 4.0V causes output to track VIN minus dropout.
Can AP7387-33SA-7 operate with ceramic output capacitors smaller than 10μF?
No - the datasheet specifies 10μF minimum ceramic output capacitance (X7R/X5R) for stability. Using <10μF risks oscillation, excessive overshoot during load transients, and failure to meet PSRR or line regulation specs. Lower ESR tantalum or polymer caps are not recommended substitutes.
Is the SOT23 package of AP7387-33SA-7 lead-free and RoHS compliant?
Yes - AP7387-33SA-7 is fully RoHS 3 compliant (2015/863/EU), lead-free, halogen-free, and antimony-free per Diodes' "Green" definition (<900ppm Br, <900ppm Cl, <1000ppm Sb). Lead content is zero; plating is matte tin on copper leads.
Does AP7387-33SA-7 require an input capacitor, and what value is recommended?
Yes - a 1μF ceramic capacitor (X7R/X5R) is required between VIN and GND, placed within 2mm of the pins. This decouples high-frequency noise from upstream supplies and prevents instability. Larger values improve noise rejection but are not necessary for basic functionality.
AP7387-33SA-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.35V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 4 µA
- Current - Supply (Max):
- -
- PSRR:
- 70dB (1kHz)
- Control Features:
- Current Limit
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
AP7387-33SA-7 FAQ
1.How can I place an order for AP7387-33SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7387-33SA-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 AP7387-33SA-7 reliable?
The price and inventory of AP7387-33SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7387-33SA-7 is usually 5 days.
3.What payment methods are accepted for AP7387-33SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7387-33SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7387-33SA-7?
AP7387-33SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7387-33SA-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 AP7387-33SA-7?
For technical support, including AP7387-33SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7387-33SA-7 requirements.
6.How does Aetrix verify that AP7387-33SA-7 is sourced from the original manufacturer or authorized distributors?
All AP7387-33SA-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 AP7387-33SA-7 meets industry standards.
7.What is the process for return or replacement of AP7387-33SA-7?
All AP7387-33SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7387-33SA-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 AP7387-33SA-7 part is unused and in its original packaging.
Return procedure for AP7387-33SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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