AP7366-18SN-7 Equivalent & Substitute Parts

Part Overview

The AP7366-18SN-7 is a linear voltage regulator IC from Diodes Incorporated designed for positive fixed 1.8V output applications with 600mA current capability in a 6-UDFN surface mount package. This part is classified as obsolete, making identification of active equivalent substitutes essential for ongoing production and design continuity. The AP7366-18SN-7 provides regulated power management with integrated protection features including over-current, over-temperature, and short-circuit protection, suitable for low-power embedded systems and portable applications requiring stable 1.8V rails.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	1.8V
Output Current	600mA
Input Voltage (Max)	6V
Voltage Dropout (Max)	0.42V @ 600mA
Quiescent Current	80 µA
PSRR	75dB ~ 55dB (1kHz ~ 10kHz)
Operating Temperature Range	-40°C ~ 85°C
Package	6-UDFN Exposed Pad (U-DFN2020-6)
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable

Substitute Part Grouping Explanation

Substitution of the AP7366-18SN-7 is determined by strict equivalence across the following critical parameters:

Fixed output voltage of 1.8V
Minimum 600mA output current capability
Maximum input voltage of 6V or greater
Surface mount 6-UDFN package with exposed pad
Operating temperature range of -40°C to 85°C or wider
Integrated enable control and protection features (over-current, over-temperature, short-circuit)

The AP7366EA-18SN-7 meets all substitution criteria as a parametric equivalent from the same manufacturer, with identical electrical specifications and package configuration. The primary distinction is product status and packaging format.

Parameter Comparison

Parameter	AP7366-18SN-7	AP7366EA-18SN-7
Manufacturer	Diodes Incorporated	Diodes Incorporated
Output Voltage (Fixed)	1.8V	1.8V
Output Current	600mA	600mA
Input Voltage (Max)	6V	6V
Voltage Dropout (Max)	0.42V @ 600mA	0.32V @ 600mA
Quiescent Current	80 µA	80 µA
PSRR	75dB ~ 55dB (1kHz ~ 10kHz)	75dB ~ 55dB (1kHz ~ 10kHz)
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C
Package	6-UDFN Exposed Pad	6-UDFN Exposed Pad
Protection Features	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit
Control Features	Enable	Enable
Product Status	Obsolete	Active
Packaging Format	Bulk	Tape & Reel (TR)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

The AP7366EA-18SN-7 is the direct active substitute for the obsolete AP7366-18SN-7. Both parts are manufactured by Diodes Incorporated and share identical electrical performance specifications, package configuration, and protection architecture. The AP7366EA-18SN-7 offers improved voltage dropout performance (0.32V versus 0.42V at 600mA), providing enhanced efficiency in applications with tighter input voltage margins.

Selection of the AP7366EA-18SN-7 is supported by active product status, ensuring long-term availability and supply chain continuity. Both parts maintain ROHS3 compliance and MSL Level 1 rating, confirming compatibility with standard manufacturing and storage protocols. The substitute part is supplied in Tape & Reel format, standard for automated assembly operations.

Frequently Asked Questions (FAQ)

Q: Can the AP7366EA-18SN-7 directly replace the AP7366-18SN-7 in existing designs?

A: Yes. Both parts are electrically and mechanically equivalent, with identical output voltage, current rating, package type, and protection features. The AP7366EA-18SN-7 demonstrates superior dropout voltage performance, making it a direct drop-in replacement.

Q: What is the significance of the product status difference between these parts?

A: The AP7366-18SN-7 is classified as obsolete, indicating discontinued manufacturing and limited future availability. The AP7366EA-18SN-7 maintains active status, ensuring reliable supply and ongoing manufacturer support for new designs and production runs.

Q: Are there packaging considerations when switching from AP7366-18SN-7 to AP7366EA-18SN-7?

A: The AP7366-18SN-7 is supplied in bulk packaging, while the AP7366EA-18SN-7 is supplied in Tape & Reel format. Both use the identical 6-UDFN surface mount package. Tape & Reel format is standard for automated pick-and-place assembly and offers improved handling efficiency in production environments.

Q: Do both parts meet the same compliance and environmental standards?

A: Yes. Both the AP7366-18SN-7 and AP7366EA-18SN-7 are ROHS3 compliant, REACH unaffected, and carry MSL Level 1 rating. Both operate across the -40°C to 85°C temperature range and are suitable for equivalent applications.

Q: What is the practical benefit of the lower dropout voltage in the AP7366EA-18SN-7?

A: The AP7366EA-18SN-7 reduces voltage dropout from 0.42V to 0.32V at 600mA output current. This 0.1V improvement allows operation with lower input supply voltages or reduces power dissipation in the regulator, benefiting battery-powered and thermally constrained applications.

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