AP7366-33SN-7 Equivalent & Substitute Parts

Part Overview

The AP7366-33SN-7 is a linear voltage regulator IC from Diodes Incorporated designed for positive fixed 3.3V output at 600mA in a 6-UDFN surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The AP7366 series provides regulated power management solutions with integrated current limiting and short circuit protection suitable for low-power applications requiring stable 3.3V rails.

Key Parameters

Parameter	Value
Manufacturer Part Number	AP7366-33SN-7
Manufacturer	Diodes Incorporated
Category	Power Management (PMIC)
Product Status	Obsolete
Output Voltage (Fixed)	3.3V
Output Current	600mA
Input Voltage (Max)	6V
Voltage Dropout (Max)	0.32V @ 600mA
Quiescent Current	80 µA
Package / Case	6-UDFN Exposed Pad
Operating Temperature	-40°C ~ 85°C
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the AP7366-33SN-7 is determined by the following critical parameters:

Primary Substitution Criteria:

Output voltage configuration (3.3V fixed output)
Output current capability (600mA minimum)
Input voltage range compatibility (6V maximum)
Package type (6-UDFN Exposed Pad for form factor compatibility)
Operating temperature range (-40°C ~ 85°C)
Regulatory compliance (ROHS3, REACH Unaffected)

Substitute Classification:

The AP7366EA-33SN-7 is a direct equivalent substitute. It maintains identical output voltage (3.3V), output current (600mA), input voltage rating (6V), package type (6-UDFN Exposed Pad), and operating temperature range. The primary difference is product status (Active vs. Obsolete) and enhanced protection features (Over Temperature protection added). This part is the recommended replacement for the obsolete AP7366-33SN-7.

The AP7366EA-18W5-7 is a functional alternative within the AP7366 family but with a different output voltage (1.8V) and package type (SOT-25). This part is suitable only for applications requiring 1.8V output and can accommodate the larger SOT-25 footprint.

Parameter Comparison

Parameter	AP7366-33SN-7 (Main)	AP7366EA-33SN-7 (Direct Equivalent)	AP7366EA-18W5-7 (Alternative)
Manufacturer	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated
Product Status	Obsolete	Active	Active
Output Voltage (Fixed)	3.3V	3.3V	1.8V
Output Current	600mA	600mA	600mA
Input Voltage (Max)	6V	6V	6V
Voltage Dropout (Max)	0.32V @ 600mA	210mV @ 600mA	0.42V @ 600mA
Quiescent Current	80 µA	80 µA	80 µA
PSRR	75dB ~ 55dB (1kHz ~ 10kHz)	75dB ~ 55dB (1kHz ~ 10kHz)	75dB ~ 55dB (1kHz ~ 10kHz)
Control Features	Current Limit, Enable	Enable	Enable
Protection Features	Over Current, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit
Package / Case	6-UDFN Exposed Pad	6-UDFN Exposed Pad	SC-74A, SOT-753
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For Direct Replacement (Recommended):

Use AP7366EA-33SN-7 as the primary substitute for AP7366-33SN-7. Both parts maintain identical electrical specifications for output voltage (3.3V) and current (600mA), identical package geometry (6-UDFN Exposed Pad), and identical operating temperature range. The AP7366EA-33SN-7 is Active status, ensuring long-term availability and supply chain continuity. Enhanced protection features (Over Temperature protection) provide additional reliability margins. Both parts are ROHS3 compliant and carry MSL 1 rating.

For Alternative Applications:

Use AP7366EA-18W5-7 only when application requirements specify 1.8V output voltage and the larger SOT-25 package footprint is acceptable. This part is not suitable as a substitute for 3.3V applications.

Compliance Considerations:

All three parts maintain ROHS3 compliance, REACH Unaffected status, and identical MSL ratings, ensuring regulatory and environmental compatibility across the AP7366 family.

Frequently Asked Questions (FAQ)

Q: Can AP7366EA-33SN-7 be used as a direct replacement for AP7366-33SN-7?

A: Yes. Both parts provide identical 3.3V fixed output at 600mA, use the same 6-UDFN Exposed Pad package, and operate across -40°C to 85°C. The AP7366EA-33SN-7 is the active production equivalent with enhanced Over Temperature protection.

Q: What is the key difference between AP7366EA-33SN-7 and AP7366EA-18W5-7?

A: Output voltage differs (3.3V vs. 1.8V) and package type differs (6-UDFN vs. SOT-25). These are not interchangeable without circuit redesign.

Q: Are there package compatibility concerns when substituting AP7366-33SN-7?

A: AP7366EA-33SN-7 uses the identical 6-UDFN Exposed Pad package, requiring no PCB layout changes. AP7366EA-18W5-7 uses SOT-25 package and requires different footprint design.

Q: Do all substitute parts meet the same compliance standards?

A: Yes. AP7366EA-33SN-7 and AP7366EA-18W5-7 are both ROHS3 compliant, REACH Unaffected, and carry MSL 1 rating identical to the main part.

Q: What is the voltage dropout difference between the main part and AP7366EA-33SN-7?

A: AP7366-33SN-7 specifies 0.32V dropout at 600mA, while AP7366EA-33SN-7 specifies 210mV (0.21V) dropout at 600mA. The substitute exhibits lower dropout voltage, providing improved efficiency in low-input-voltage applications.

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