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Diodes Incorporated AP7387-33W5-7
- Part No.:
- AP7387-33W5-7
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP7387-33W5-7.pdf
- Description:
- LDO CMOS LOWCURR SOT25 T&R 3K
- Quantity:
- Payment:
- Shipping:
Inventory:3,370
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Product details
Overview
AP7387-33W5-7 from Diodes Incorporated is a wide-input (5–60V), 3.3V fixed-output, 150mA ultra-low-dropout linear regulator in SOT25 package. It delivers ±2% output accuracy, 700mV dropout at 100mA, 2μA quiescent current, and 70dB PSRR at 1kHz-designed for battery-powered sensors and EV battery management systems where high input voltage tolerance and low standby power are critical.
For engineers reviewing the AP7387-33W5-7 datasheet, AP7387-33W5-7 pinout, AP7387-33W5-7 application, or AP7387-33W5-7 equivalent, key selection criteria include input voltage range up to 60V, thermal shutdown at +150°C, current-limit protection at 250mA, and compatibility with 1μF input / 10μF ceramic output capacitors.
Technical Context
The AP7387-33W5-7 integrates a precision voltage reference, error amplifier, and current-limit circuit with thermal shutdown and short-circuit protection. Its architecture supports fast line/load transient response due to internal compensation optimized for 10μF ceramic output capacitance.
It operates across –40°C to +125°C junction temperature with 150°C absolute maximum rating, and achieves 150°C/W θJA in SOT25 package. The device uses an internal PMOS pass transistor enabling low dropout and high PSRR without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5V to 60V - enables direct connection to 48V industrial buses or EV battery stacks without pre-regulation. |
| Output Voltage | 3.3V ±2% - meets microcontroller I/O rail tolerance for reliable logic-level interfacing. |
| Max Output Current | 150mA - sufficient to power low-power MCUs, sensors, or RF transceivers in portable systems. |
| Dropout Voltage | 700mV @ 100mA - allows regulation from 4.0V input to 3.3V output, extending battery runtime. |
| Quiescent Current | 2μA typ. - minimizes standby power loss in always-on smoke detectors or IoT edge nodes. |
| PSRR | 70dB @ 1kHz - suppresses switching noise from adjacent DC/DC converters in mixed-power systems. |
| Thermal Shutdown | +150°C with +30°C hysteresis - prevents latch-up during sustained overload or poor PCB thermal design. |
Pinout & Package
SOT25 package (3.0mm × 2.8mm × 1.3mm) with exposed thermal pad; requires minimum 2oz copper pour connected to GND for thermal dissipation.
| 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 | Power ground reference; connects internally to exposed pad; PCB copper area under pad must tie to system GND plane. |
| 3 | VOUT | Regulated 3.3V output; requires ≥10μF X7R/X5R ceramic capacitor placed within 2mm of pin for stability. |
| 4 | NC | No internal connection; recommended to connect to GND for improved thermal conduction and EMI shielding. |
| 5 | NC | No internal connection; recommended to connect to GND for improved thermal conduction and EMI shielding. |
Key Features
| Feature | Design Value |
|---|---|
| Wide input voltage range | 5V–60V operation eliminates need for external buck pre-regulator in 24V/48V industrial or automotive subsystems. |
| Ultra-low quiescent current | 2μA typical enables >10-year battery life in coin-cell–powered smoke detectors with periodic wake-up cycles. |
| Fast transient response | Sub-200μs recovery from 10mA↔100mA load steps ensures stable MCU core voltage during burst-mode processing. |
| Integrated protection | Current limit (250mA), thermal shutdown (+150°C), and short-circuit protection reduce BOM count and improve field reliability. |
| RoHS/Green compliance | Fully lead-free, halogen-free, and antimony-free construction meets global environmental regulations without derating. |
Applications
| Smoke Detector Power Supply | EV Battery Cell Monitor |
|---|---|
Use Scenario: Primary 3.3V rail for CO sensor IC, MCU, and RF transceiver in battery-operated residential smoke alarms. IC Role / Device Role / Timing Role: Ultra-low-IQ LDO providing regulated VCC to safety-critical analog and digital circuitry. Use Value: 2μA quiescent current extends 9V alkaline battery life beyond 10 years while maintaining ±2% output accuracy over temperature. |
Use Scenario: Local 3.3V supply for isolated cell monitoring ICs in 400V+ EV battery packs with wide bus voltage variation. IC Role / Device Role / Timing Role: High-input-voltage LDO delivering stable bias to precision ADCs and isolation interfaces. Use Value: 60V max input withstands transients on battery pack main bus; 70dB PSRR rejects switching noise from adjacent DC/DC converters. |
| Industrial Sensor Node | Home Appliance MCU Rail |
Use Scenario: Powering wireless sensor modules (BLE/Zigbee) in factory-floor condition monitoring systems powered from 24V DC rails. IC Role / Device Role / Timing Role: Input-tolerant LDO supplying clean 3.3V to RF SoC and analog front-end. Use Value: 150mA output supports peak transmit current; 700mV dropout enables operation down to 4.0V input during brownout conditions. |
Use Scenario: Main 3.3V supply for control MCU and touch interface in smart washing machines and refrigerators with variable AC-DC adapter outputs. IC Role / Device Role / Timing Role: Robust local regulator decoupling noisy SMPS-derived 5V/12V rails. Use Value: Thermal shutdown and current limit prevent failure during motor surge events; ±2% accuracy ensures consistent UI responsiveness. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-dropout, wide-input-voltage regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7361-33W5-7 | Lower max input (45V vs. 60V); same 3.3V/150mA output; 3μA IQ; no thermal hysteresis spec. | Limited to 45V systems; less suitable for 48V EV auxiliary rails or industrial 60V transients. | Select when input never exceeds 45V and thermal hysteresis is non-critical; lower cost alternative. |
| MCP1703T-3302E/MB | 40V max input; 250mA output; 1.8μA IQ; 600mV dropout @ 100mA; no current-limit protection. | Lacks integrated current-limit and thermal shutdown; requires external protection circuitry for robustness. | Choose only for space-constrained, low-risk consumer applications where protection is handled upstream. |
Compared with AP7387-33W5-7, AP7361-33W5-7 trades 15V input headroom for marginal cost reduction, while MCP1703T-3302E/MB offers lower IQ but omits critical fault protections required in industrial and automotive environments.
Availability
AP7387-33W5-7 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 across extended temperature and voltage ranges.
Supply support for AP7387-33W5-7 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 manufacturer specializing in discrete, analog, and mixed-signal solutions for industrial, automotive, computing, and consumer markets.
The AP7387 product line targets high-reliability, wide-input-voltage power management in harsh environments-specifically engineered for battery-backed safety systems and electric vehicle subsystems demanding robust thermal and overcurrent protection.
FAQ
What is the minimum input voltage required for regulation at 3.3V output?
The AP7387-33W5-7 requires VIN ≥ VOUT + VDROP. With 700mV typical dropout at 100mA, the minimum functional input is 4.0V. At full 150mA load, dropout rises to 1100mV, requiring ≥4.4V input for stable 3.3V regulation. Below these thresholds, output voltage drops linearly with input.
Can AP7387-33W5-7 operate without an output capacitor?
No. An output capacitor ≥10μF ceramic (X7R/X5R) is mandatory for loop stability and transient response. Omitting it causes oscillation and potential damage. The capacitor must be placed within 2mm of VOUT and GND pins; larger values (e.g., 22μF) further reduce undershoot during load steps.
Is the exposed pad on the SOT25 package electrically connected?
Yes-the exposed pad is internally connected to GND. It must be soldered to a dedicated PCB copper pour tied to the system ground plane. This connection is essential for thermal performance (θJA = 150°C/W) and EMI suppression; floating the pad degrades both thermal resistance and PSRR.
Does AP7387-33W5-7 support adjustable output voltage?
No. AP7387-33W5-7 is a fixed 3.3V output device. The "33" in the part number denotes the 3.3V version; other variants (e.g., AP7387-30W5-7, AP7387-50W5-7) offer 3.0V and 5.0V outputs. Adjustable versions are not offered in the AP7387 family.
AP7387-33W5-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- 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-25
AP7387-33W5-7 FAQ
1.How can I place an order for AP7387-33W5-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7387-33W5-7 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 AP7387-33W5-7 reliable?
The price and inventory of AP7387-33W5-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7387-33W5-7 is usually 5 days.
3.What payment methods are accepted for AP7387-33W5-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7387-33W5-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7387-33W5-7?
AP7387-33W5-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7387-33W5-7 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 AP7387-33W5-7?
For technical support, including AP7387-33W5-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7387-33W5-7 requirements.
6.How does Aetrix verify that AP7387-33W5-7 is sourced from the original manufacturer or authorized distributors?
All AP7387-33W5-7 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 AP7387-33W5-7 meets industry standards.
7.What is the process for return or replacement of AP7387-33W5-7?
All AP7387-33W5-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7387-33W5-7, 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 AP7387-33W5-7 part is unused and in its original packaging.
Return procedure for AP7387-33W5-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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