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Diodes Incorporated AP7387-33FDCR-7-50
- Part No.:
- AP7387-33FDCR-7-50
- Manufacturer:
- Diodes Incorporated
- Package:
- 6-UDFN Exposed Pad
- Datasheet:
-
AP7387-33FDCR-7-50.pdf
- Description:
- LDO CMOS LOWCURR U-DFN2020-6 T&R
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
AP7387-33FDCR-7 from Diodes Incorporated is a wide-input (5–60V), 3.3V fixed-output, 150mA ultra-low-dropout linear regulator in U-DFN2020-6R (Type C) package. It delivers ±2% output voltage accuracy, 700mV dropout at 100mA, and 2μA quiescent current-enabling reliable power for battery-powered smoke detectors and EV battery management systems where input voltage varies widely and standby power must be minimized.
For engineers reviewing the AP7387-33FDCR-7 datasheet, AP7387-33FDCR-7 pinout, AP7387-33FDCR-7 application, or AP7387-33FDCR-7 equivalent, key selection criteria include its 60V max input rating, thermal shutdown at +150°C, 48°C/W θJA in U-DFN2020-6R, fast load transient response (<200μs settling), and compatibility with 10μF ceramic output capacitance for stability.
Technical Context
The AP7387-33FDCR-7 integrates a precision voltage reference, error amplifier, current-limit circuit, thermal shutdown comparator, and short-circuit protection logic into a single monolithic IC. Its architecture supports stable regulation across 55V input swing while maintaining low noise and high PSRR (70dB @ 1kHz).
It operates without external compensation, relying on internal feedback and a fixed 3.3V output setpoint. The U-DFN2020-6R package features an exposed pad internally tied to GND, enabling efficient heat dissipation via PCB copper area-critical for sustained 150mA operation under high VIN–VOUT differentials.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5V to 60V - supports direct connection to 12V/24V/48V industrial or automotive battery rails without pre-regulation. |
| Output Voltage | 3.3V ±2% - ensures MCU I/O and sensor interface compatibility across temperature and load variation. |
| Max Output Current | 150mA - sufficient for low-power microcontrollers, analog sensors, and RF transceivers in compact designs. |
| Dropout Voltage | 700mV @ 100mA (typ.) - enables regulation down to VIN = 4.0V while delivering 3.3V, extending usable battery life. |
| Quiescent Current | 2μA (typ.) - minimizes standby power loss in always-on smoke detectors and remote IoT nodes. |
| PSRR | 70dB @ 1kHz - suppresses ripple from noisy DC-DC converters or alternator supplies in vehicle applications. |
| Thermal Shutdown | +150°C with +30°C hysteresis - prevents permanent damage during overload or poor PCB thermal design. |
| Package Thermal Resistance | θJA = 48°C/W (U-DFN2020-6R) - requires ≥100mm² GND-connected copper pour for full 150mA capability at TA = +85°C. |
Pinout & Package
AP7387-33FDCR-7 is housed in a 2.0mm × 2.0mm × 0.6mm U-DFN2020-6R (Type C) package with wettable flank leads and an exposed thermal pad (EP) internally connected to GND. The package is RoHS-compliant, halogen-free, and rated MSL Level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VIN | Main input supply pin; accepts 5–60V; requires 1μF ceramic decoupling placed adjacent to pin. |
| 2, 5 | GND | Power ground reference; both pins must connect to low-impedance PCB ground plane for stability and thermal performance. |
| 3 | VOUT | Regulated 3.3V output; drives load up to 150mA; requires 10μF X7R/X5R ceramic capacitor within 2mm. |
| 4 | NC | No internal connection; recommended to tie to GND to enhance thermal conduction and reduce EMI susceptibility. |
| 6 | NC | No internal connection; same as Pin 4 - connect to GND for optimal thermal and EMI performance. |
| EP | Exposed Pad | Internally bonded to GND; must be soldered to ≥100mm² GND copper area for thermal dissipation and electrical integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Wide Input Range (5–60V) | Eliminates need for external buck pre-regulator in 24V/48V industrial or HEV battery monitoring circuits. |
| Ultra-Low IQ (2μA) | Extends shelf life of battery-powered smoke detectors beyond 10 years in standby mode. |
| Fast Transient Response | Settles within 200μs after 10–100mA load step - maintains clean supply for real-time sensor sampling and MCU wake-up. |
| Integrated Protection | Combines current limit (250mA typ.), short-circuit foldback, and thermal shutdown - reduces BOM count and failure modes. |
| High PSRR (70dB @ 1kHz) | Rejects switching noise from adjacent DC-DC converters, enabling mixed-signal integrity in compact PCB layouts. |
| U-DFN2020-6R Package | Enables <4mm² footprint with superior thermal performance vs. SOT23/SOT89 - ideal for space-constrained automotive modules. |
Applications
| Smoke Detector Power Supply | EV Battery Cell Monitor |
|---|---|
|
Use Scenario: Primary 3.3V rail for CO sensor, MCU, and wireless transceiver in lithium-thionyl chloride–powered residential smoke alarms. IC Role / Device Role / Timing Role: Main LDO supplying regulated VDD to ultra-low-power ARM Cortex-M0+ and analog front-end. Use Value: 2μA quiescent current extends 10-year battery life; 60V input tolerance accommodates initial battery charge spikes up to 58V. |
Use Scenario: Local 3.3V supply for isolated cell voltage measurement ICs and CAN transceivers in 400V EV battery packs. IC Role / Device Role / Timing Role: Post-DC-DC LDO providing clean, low-noise bias to precision ADCs and isolation drivers. Use Value: 70dB PSRR suppresses switching noise from 12V auxiliary DC-DC; thermal shutdown protects against cell imbalance faults. |
| Industrial PLC Sensor Node | Home Appliance MCU Subsystem |
|
Use Scenario: Powering 3.3V RS-485 transceivers and temperature/humidity sensors in DIN-rail mounted condition monitoring units. IC Role / Device Role / Timing Role: Secondary LDO deriving stable rail from 24V field bus, tolerant of brownouts and surges. Use Value: 700mV dropout allows operation down to 4.0V input - maintains communication during 24V supply dips to 10V. |
Use Scenario: Standby power source for smart refrigerator control board MCU and touch interface ASIC. IC Role / Device Role / Timing Role: Always-on LDO powering RTC, wake-up logic, and memory retention during main system sleep. Use Value: ±2% output accuracy ensures reliable brown-out detection and EEPROM write integrity across -40°C to +85°C ambient. |
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 |
|---|---|---|---|
| AP7381-33W5-7 | SOT25 package (θJA = 150°C/W); same 3.3V/150mA spec but higher thermal resistance and no exposed pad. | Less suitable for continuous 150mA loads above +60°C ambient due to limited thermal headroom. | Select only when board space permits larger SOT25 and thermal derating is acceptable. |
| TPS7B8733QKVURQ1 | Automotive-grade (AEC-Q100), 40V max input, 150mA, 2.5μA IQ, but requires external 10μF output cap and has 1.2V min dropout. | Qualified for under-hood use; lacks 60V input range and fast transient response of AP7387. | Choose for automotive production requiring AEC-Q100 qualification, not for 48V+ industrial or HEV systems. |
Compared with AP7387-33FDCR-7, AP7381-33W5-7 trades thermal performance for legacy package compatibility, while TPS7B8733QKVURQ1 adds automotive qualification at the cost of input voltage range and transient speed-making the AP7387 uniquely suited for high-voltage, space-constrained, low-quiescent industrial sensing.
Availability
AP7387-33FDCR-7 is available at Aetrix Electronics and suitable for battery-powered equipment, EV battery management systems, smoke detectors, and home appliance subsystems requiring stable component supply with long-lifecycle support and consistent parametric performance.
Supply support for AP7387-33FDCR-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 belongs to Diodes' high-voltage LDO family, designed specifically for robust power regulation in harsh environments where wide input ranges, ultra-low IQ, and integrated protection are mandatory-such as battery monitoring, safety-critical sensors, and industrial control interfaces.
FAQ
What is the minimum input voltage required for AP7387-33FDCR-7 to regulate 3.3V at 100mA?
The dropout voltage is 700mV (typ.) at 100mA, so the minimum input voltage is 3.3V + 0.7V = 4.0V. This allows operation from partially discharged 2-cell Li-ion (6V nominal) or 5V USB-powered systems with margin. Absolute minimum VIN per datasheet is 5.0V for guaranteed specification compliance across temperature and process variation.
Can AP7387-33FDCR-7 be used without an output capacitor?
No. A minimum 10μF ceramic output capacitor (X7R/X5R) is mandatory for stability and transient response. Omitting it causes oscillation, excessive overshoot/undershoot during load steps, and potential thermal shutdown. The capacitor must be placed within 2mm of VOUT and GND pins using low-inductance layout.
How does the U-DFN2020-6R package differ from U-DFN2020-6 in AP7387 variants?
U-DFN2020-6R (FDCR) features wettable flank leads for automated optical solder-joint inspection (AOI), whereas standard U-DFN2020-6 (FDC) does not. Both share identical die, pinout, thermal pad, and electrical specs-but FDCR enables inline solder quality verification in high-reliability manufacturing.
Is AP7387-33FDCR-7 qualified for automotive applications?
No. The AP7387-33FDCR-7 is an industrial-grade part. For automotive use, Diodes offers the AP7387Q series (e.g., AP7387Q-33FDCR-7), which undergoes AEC-Q100 stress testing, includes extended temperature screening (-40°C to +125°C), and is manufactured in IATF 16949-certified facilities.
AP7387-33FDCR-7-50 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 6-UDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- -
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- U-DFN2020-6 (Type C)
AP7387-33FDCR-7-50 FAQ
1.How can I place an order for AP7387-33FDCR-7-50 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7387-33FDCR-7-50 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 AP7387-33FDCR-7-50 reliable?
The price and inventory of AP7387-33FDCR-7-50 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7387-33FDCR-7-50 is usually 5 days.
3.What payment methods are accepted for AP7387-33FDCR-7-50?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7387-33FDCR-7-50 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7387-33FDCR-7-50?
AP7387-33FDCR-7-50 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7387-33FDCR-7-50 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 AP7387-33FDCR-7-50?
For technical support, including AP7387-33FDCR-7-50 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7387-33FDCR-7-50 requirements.
6.How does Aetrix verify that AP7387-33FDCR-7-50 is sourced from the original manufacturer or authorized distributors?
All AP7387-33FDCR-7-50 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 AP7387-33FDCR-7-50 meets industry standards.
7.What is the process for return or replacement of AP7387-33FDCR-7-50?
All AP7387-33FDCR-7-50 units undergo pre-shipment inspection (PSI). If there is an issue with AP7387-33FDCR-7-50, 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 AP7387-33FDCR-7-50 part is unused and in its original packaging.
Return procedure for AP7387-33FDCR-7-50:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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