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Diodes Incorporated AP7387-33FDC-7
- Part No.:
- AP7387-33FDC-7
- Manufacturer:
- Diodes Incorporated
- Package:
- 6-UDFN Exposed Pad
- Datasheet:
-
AP7387-33FDC-7.pdf
- Description:
- LDO CMOS LowCurr U-DFN2020-6 T&R
- Quantity:
- Payment:
- Shipping:
Inventory:2,752
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Product details
Overview
AP7387-33FDC-7 from Diodes Incorporated is a wide-input (5–60 V), 3.3 V fixed-output, 150 mA ultra-low-dropout linear regulator in U-DFN2020-6 (Type C) package. It delivers ±2% output voltage accuracy, 700 mV dropout at 100 mA, and 2 µA quiescent current-enabling long-life operation in battery-powered smoke detectors and EV battery management systems.
For engineers reviewing the AP7387-33FDC-7 datasheet, AP7387-33FDC-7 pinout, AP7387-33FDC-7 application, or AP7387-33FDC-7 equivalent, key selection criteria include input voltage range up to 60 V, thermal shutdown at +150 °C, PSRR of 70 dB @ 1 kHz, and compatibility with 10 µF ceramic output capacitance for transient stability.
Technical Context
The AP7387-33FDC-7 integrates a precision voltage reference, error amplifier, current-limit circuit, thermal shutdown, and short-circuit protection in a single monolithic IC. Its architecture supports fast line/load transient response due to high-loop-gain error amplification and low-output-impedance regulation.
It operates across –40 °C to +125 °C junction temperature with internal thermal hysteresis of +30 °C and features an exposed pad thermally connected to GND. The U-DFN2020-6 (Type C) package provides θJA = 48 °C/W and θJC = 15.5 °C/W for efficient power dissipation under sustained 150 mA loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5 V to 60 V - enables direct connection to automotive 12/24/48 V rails or industrial DC bus without pre-regulation |
| Output Voltage | 3.3 V ±2% - meets I/O voltage requirements of modern microcontrollers and sensors |
| Max Output Current | 150 mA - sufficient for powering MCU cores, RF transceivers, or sensor signal chains |
| Dropout Voltage | 700 mV @ 100 mA (typ.) - allows stable 3.3 V output even when input drops to 4.0 V |
| Quiescent Current | 2 µA (typ.) - extends battery life in always-on monitoring applications like smoke detectors |
| PSRR | 70 dB @ 1 kHz - suppresses ripple from noisy DC-DC converters or alternator sources |
| Thermal Shutdown | +150 °C with +30 °C hysteresis - prevents latch-up during overloads while enabling automatic recovery |
Pinout & Package
AP7387-33FDC-7 uses the U-DFN2020-6 (Type C) package (2.0 mm × 2.0 mm × 0.6 mm), featuring an exposed thermal pad (EP) internally connected to GND. PCB layout requires large copper area under EP tied to GND for optimal thermal performance (θJA = 48 °C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VIN | Main input supply pin - accepts 5–60 V; requires 1 µF ceramic decoupling capacitor placed adjacent to pin |
| 2, 5 | GND | Ground reference and return path - both pins must be connected to low-impedance ground plane |
| 3, 4 | NC | No-connect terminals - recommended to tie to GND for enhanced thermal conduction and EMI reduction |
| 6 | VOUT | Regulated 3.3 V output - requires 10 µF X7R/X5R ceramic capacitor placed within 2 mm of pin |
| EP | Exposed Pad | Internally connected to GND - must be soldered to ≥100 mm² copper pour for thermal dissipation and noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Wide Input Range (5–60 V) | Eliminates need for external buck pre-regulator in 24/48 V industrial or EV battery systems |
| Ultra-Low IQ (2 µA) | Enables >10-year battery life in low-duty-cycle IoT sensors and safety devices |
| High PSRR (70 dB @ 1 kHz) | Maintains clean 3.3 V rail despite switching noise from adjacent DC-DC converters |
| Fast Transient Response | Stabilizes within <200 µs after 10–100 mA load steps - critical for burst-mode MCU operation |
| Integrated Protections | Current limit (250 mA), thermal shutdown (+150 °C), and short-circuit protection reduce external component count |
Applications
| Smoke Detector Power Supply | EV Battery Monitoring Node |
|---|---|
|
Use Scenario: Primary 3.3 V rail for CO/heat sensor interface, MCU, and wireless transmitter in battery-backed residential smoke alarms. IC Role / Device Role / Timing Role: Ultra-low-IQ LDO providing stable bias for analog front-end and digital logic during standby and alarm activation. Use Value: 2 µA quiescent current extends 9 V alkaline battery life beyond 10 years per UL 217 requirements. |
Use Scenario: Local 3.3 V supply for cell-voltage monitoring ICs and isolation gate drivers in 48 V–800 V EV battery packs. IC Role / Device Role / Timing Role: High-input LDO regulating auxiliary power from intermediate bus, immune to load dump transients. Use Value: 60 V max input withstands ISO 7637-2 Pulse 5a (load dump) without external TVS clamping. |
| Industrial Sensor Transmitter | Home Appliance MCU Subsystem |
|
Use Scenario: Powering 4–20 mA loop-powered pressure/temperature transmitters with 2-wire analog output. IC Role / Device Role / Timing Role: Low-noise, high-PSRR regulator supplying ADC reference and signal conditioning circuitry. Use Value: 70 dB PSRR ensures <1 LSB error in 16-bit ADCs operating near noisy motor drives or inverters. |
Use Scenario: Standby and active-mode 3.3 V supply for touch controller, display driver, and Wi-Fi SoC in smart refrigerators and washing machines. IC Role / Device Role / Timing Role: Efficient LDO delivering regulated rail during variable-load cycles including display backlight bursts. Use Value: 150 mA output and fast transient response prevent brownout during simultaneous Wi-Fi transmit + display update events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-IQ, wide-input LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7B8733QKVURQ1 | Automotive AEC-Q100 Grade 1; 1.3 µA IQ; 40 V max input; 3.3 V ±1%; 150 mA | Qualified for automotive under-hood use; lacks 60 V input capability and thermal hysteresis spec | Select for automotive BMS modules requiring AEC-Q100 compliance; not suitable for 48 V+ industrial inputs |
| MCP1703T-3302E/MB | 6 V max input; 2.5 µA IQ; 3.3 V ±1%; 250 mA; SOT23-5 package | Limited to low-voltage systems; higher output current but no overvoltage or thermal protection | Use only in ≤6 V battery-powered consumer devices where cost and size outweigh protection needs |
Compared with TPS7B8733QKVURQ1 and MCP1703T-3302E/MB, AP7387-33FDC-7 uniquely combines 60 V input tolerance, automotive-grade thermal protection, and 2 µA IQ in a 2 mm × 2 mm DFN-making it the sole choice for space-constrained, high-reliability 24–48 V industrial and safety-critical applications.
Availability
AP7387-33FDC-7 is available at Aetrix Electronics and suitable for battery-powered equipment, smoke detectors and sensors, EV and HEV battery management systems, and micro-controller applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for AP7387-33FDC-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 industrial, automotive, computing, and consumer markets.
The AP7387 belongs to Diodes' high-voltage LDO product line, engineered specifically for reliable power regulation in harsh environments-including battery management, safety-critical sensing, and wide-input industrial control systems.
FAQ
What is the minimum input voltage required for AP7387-33FDC-7 to regulate 3.3 V output?
The AP7387-33FDC-7 requires VIN ≥ VOUT + VDROP. With typical dropout of 700 mV at 100 mA, the minimum functional input is 4.0 V. At full 150 mA load, dropout rises to 1100 mV, requiring ≥4.4 V input for regulation. Below these thresholds, output voltage collapses linearly with input.
Can AP7387-33FDC-7 operate without an output capacitor?
No. An output capacitor is mandatory for stability. The datasheet specifies a minimum 10 µF X7R/X5R ceramic capacitor placed within 2 mm of VOUT and GND pins. Omitting it causes oscillation, excessive noise, and potential thermal runaway under load.
Is the exposed pad (EP) on AP7387-33FDC-7 electrically isolated?
No. The exposed pad is internally connected to GND. It must be soldered to a PCB copper area tied to the system ground plane. Failure to connect EP to GND degrades thermal performance (θJA increases from 48 to >100 °C/W) and reduces PSRR by up to 20 dB.
Does AP7387-33FDC-7 support adjustable output voltage via external resistors?
No. AP7387-33FDC-7 is a fixed 3.3 V output device. The "33" in the part number denotes the factory-trimmed output voltage. Adjustable versions are not offered in this family; alternative regulators like AP7361 series would be required for programmable outputs.
AP7387-33FDC-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 6-UDFN Exposed Pad
- Packaging:
- Bulk
- 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- U-DFN2020-6 (Type C)
AP7387-33FDC-7 FAQ
1.How can I place an order for AP7387-33FDC-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7387-33FDC-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 AP7387-33FDC-7 reliable?
The price and inventory of AP7387-33FDC-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7387-33FDC-7 is usually 5 days.
3.What payment methods are accepted for AP7387-33FDC-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7387-33FDC-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7387-33FDC-7?
AP7387-33FDC-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7387-33FDC-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 AP7387-33FDC-7?
For technical support, including AP7387-33FDC-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7387-33FDC-7 requirements.
6.How does Aetrix verify that AP7387-33FDC-7 is sourced from the original manufacturer or authorized distributors?
All AP7387-33FDC-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 AP7387-33FDC-7 meets industry standards.
7.What is the process for return or replacement of AP7387-33FDC-7?
All AP7387-33FDC-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7387-33FDC-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 AP7387-33FDC-7 part is unused and in its original packaging.
Return procedure for AP7387-33FDC-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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