AP7366-39SN-7 Equivalent & Substitute Parts

Part Overview

The AP7366-39SN-7 is a linear voltage regulator IC from Diodes Incorporated designed for positive fixed output applications. This device delivers 600mA output current at a fixed 3.9V output voltage with a maximum dropout voltage of 0.29V at full load. The part is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement continuity. Active alternatives with identical or improved electrical characteristics are available to maintain system compatibility.

Key Parameters

Parameter	Value
Manufacturer Part Number	AP7366-39SN-7
Manufacturer	Diodes Incorporated
Category	Power Management (PMIC)
Output Voltage (Fixed)	3.9V
Output Current	600mA
Input Voltage (Max)	6V
Dropout Voltage (Max)	0.29V @ 600mA
Quiescent Current	80 µA
Operating Temperature Range	-40°C to 85°C
Package Type	6-UDFN Exposed Pad (U-DFN2020-6)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the AP7366-39SN-7 is determined by the following critical parameters:

Fixed output voltage of 3.9V
Minimum output current capability of 600mA
Maximum input voltage of 6V
Operating temperature range of -40°C to 85°C
Positive output configuration with single regulator
Enable control feature and protection features (Over Current, Over Temperature, Short Circuit)
ROHS3 compliance and MSL Level 1 rating

Two active substitute parts meet these criteria: AP7366EA-39SN-7 and AP7366EA-39W5-7. Both are manufactured by Diodes Incorporated and maintain electrical equivalence to the obsolete AP7366-39SN-7. The primary distinction between substitutes is packaging format: AP7366EA-39SN-7 retains the original 6-UDFN package, while AP7366EA-39W5-7 uses an alternative SOT-25 package.

Parameter Comparison

Parameter	AP7366-39SN-7 (Main)	AP7366EA-39SN-7 (Substitute)	AP7366EA-39W5-7 (Substitute)
Manufacturer	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated
Output Voltage (Fixed)	3.9V	3.9V	3.9V
Output Current	600mA	600mA	600mA
Input Voltage (Max)	6V	6V	6V
Dropout Voltage (Max)	0.29V @ 600mA	0.19V @ 600mA	0.29V @ 600mA
Quiescent Current	80 µA	80 µA	80 µA
PSRR	75dB ~ 55dB (1kHz ~ 10kHz)	75dB ~ 55dB (1kHz ~ 10kHz)	75dB ~ 55dB (1kHz ~ 10kHz)
Operating Temperature	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C
Package Type	6-UDFN Exposed Pad	6-UDFN Exposed Pad	SOT-25 (SC-74A)
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	Level 1 (Unlimited)	Level 1 (Unlimited)	Level 1 (Unlimited)

Engineering Selection Recommendations

Both AP7366EA-39SN-7 and AP7366EA-39W5-7 are active products suitable for replacing the obsolete AP7366-39SN-7. Selection between these substitutes depends on PCB layout and packaging constraints:

AP7366EA-39SN-7 maintains the original 6-UDFN Exposed Pad package footprint, enabling direct board-level substitution without layout modifications. This part features improved dropout voltage performance (0.19V vs. 0.29V), reducing power dissipation in current-limited applications. Both the main part and this substitute share identical package geometry.

AP7366EA-39W5-7 provides the same electrical performance as the main part (0.29V dropout voltage) but uses an SOT-25 package. This alternative is suitable for designs where the larger SOT-25 footprint is acceptable or preferred for thermal management or assembly considerations.

All three parts maintain ROHS3 compliance, MSL Level 1 rating, and identical functional specifications for output voltage, current, and temperature range. Active product status for both substitutes ensures long-term availability and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can AP7366EA-39SN-7 replace AP7366-39SN-7 without PCB modifications?

A: Yes. AP7366EA-39SN-7 uses the identical 6-UDFN Exposed Pad package (U-DFN2020-6), allowing direct footprint compatibility. No layout changes are required.

Q: What is the difference between AP7366EA-39SN-7 and AP7366EA-39W5-7?

A: Both parts deliver identical output voltage (3.9V), current (600mA), and operating temperature range. The primary difference is packaging: AP7366EA-39SN-7 uses 6-UDFN, while AP7366EA-39W5-7 uses SOT-25. AP7366EA-39SN-7 also features lower dropout voltage (0.19V vs. 0.29V).

Q: Are the substitute parts RoHS compliant?

A: Yes. Both AP7366EA-39SN-7 and AP7366EA-39W5-7 are ROHS3 compliant with MSL Level 1 rating, matching the compliance profile of the original AP7366-39SN-7.

Q: Why is the original AP7366-39SN-7 marked as obsolete?

A: Product obsolescence is determined by the manufacturer. Active substitutes with equivalent or improved electrical characteristics are available to support ongoing applications.

Q: Which substitute should I select for new designs?

A: For new designs, either substitute is acceptable based on packaging requirements. AP7366EA-39SN-7 is recommended if the original 6-UDFN footprint is already established in your design. AP7366EA-39W5-7 offers flexibility for designs where SOT-25 packaging is preferred.

Q: Do the substitutes have the same protection features?

A: Yes. All three parts include Over Current, Over Temperature, and Short Circuit protection with Enable control features.

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