AP65355FN-7 Equivalent & Substitute Parts

Part Overview

The AP65355FN-7 is a buck switching regulator IC manufactured by Diodes Incorporated, designed for positive adjustable output applications with 3A output current capability. This component operates across an input voltage range of 4.5V to 18V and provides adjustable output voltage from 0.76V to 6V. The device is currently classified as obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity.

Substiute Parts

AP65355FN-7

Diodes IncorporatedIn Stock: 4181AP65355FN-7 Datasheet

Current PartRFQ

TPS54302DDCT

Texas InstrumentsIn Stock: 2040TPS54302DDCT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AP65355FN-7 is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Output current rating: minimum 3A
• Input voltage range: must accommodate 4.5V to 18V
• Output voltage adjustability: must support 0.76V minimum and 6V maximum
• Topology: buck switching regulator with synchronous rectification
• Output configuration: positive adjustable

Mechanical Compatibility Criteria:

• Mounting type: surface mount
• Package compatibility: component must be available in a surface-mount package suitable for PCB integration

Compliance Criteria:

• RoHS3 compliance required
• MSL rating of 1 or equivalent

The TPS54302DDCT from Texas Instruments meets these substitution criteria with equivalent or superior electrical specifications and maintains compliance with applicable standards.

Parameter Comparison

Engineering Selection Recommendations

The TPS54302DDCT is a suitable substitute for the AP65355FN-7 based on the following factors:

Product Status: The AP65355FN-7 is obsolete, while the TPS54302DDCT maintains active product status from Texas Instruments, ensuring ongoing availability and manufacturing support.

Electrical Specifications: The TPS54302DDCT meets or exceeds all critical electrical parameters of the AP65355FN-7. The substitute provides equivalent 3A output current, identical minimum input voltage of 4.5V, and adjustable output voltage capability that encompasses the required 0.76V to 6V range. The substitute's higher maximum input voltage (28V versus 18V) and extended output voltage range provide additional design margin.

Compliance and Certifications: Both components maintain ROHS3 compliance and MSL rating of 1 (Unlimited), meeting identical regulatory and moisture sensitivity requirements.

Package Consideration: The TPS54302DDCT uses SOT-23-6 packaging versus the 10-UFDFN package of the original component. PCB layout modification is required to accommodate the different package footprint and pin configuration.

Operating Temperature: The TPS54302DDCT supports an extended operating temperature range to 125°C (junction temperature) compared to 85°C (ambient temperature) for the AP65355FN-7, providing improved thermal performance margin.

Frequently Asked Questions (FAQ)

Q: Can the TPS54302DDCT directly replace the AP65355FN-7 without PCB modifications?

A: No. The TPS54302DDCT uses a SOT-23-6 package while the AP65355FN-7 uses a 10-UFDFN package. Different pin configurations and footprints require PCB layout redesign. Pin function mapping must be verified against both datasheets before implementation.

Q: What is the impact of the different switching frequency (400kHz versus 650kHz)?

A: The TPS54302DDCT operates at 400kHz compared to the AP65355FN-7 at 650kHz. Lower switching frequency may result in larger output filter components and different EMI characteristics. Circuit design parameters including inductor and capacitor values must be recalculated based on the substitute's operating frequency.

Q: Are the output voltage adjustment ranges compatible?

A: Yes. The TPS54302DDCT supports adjustable output voltage from 0.596V to 28V, which encompasses the AP65355FN-7 range of 0.76V to 6V. Feedback network design using external resistors determines the actual output voltage for both components.

Q: Does the substitute support the same input voltage range?

A: The TPS54302DDCT supports 4.5V to 28V input, exceeding the AP65355FN-7 specification of 4.5V to 18V. For applications limited to 18V maximum input, the substitute operates within safe margins. Applications requiring input voltages above 18V benefit from the extended range.

Q: What compliance certifications apply to both components?

A: Both the AP65355FN-7 and TPS54302DDCT are ROHS3 compliant with MSL rating of 1 (Unlimited). Both carry REACH Unaffected status and EAR99 ECCN classification.

Q: Is the TPS54302DDCT available in the same packaging as the original?

A: No. The TPS54302DDCT is available only in SOT-23-6 Thin (TSOT-23-6) packaging. The original AP65355FN-7 used 10-UFDFN Exposed Pad packaging. Package selection is determined by the substitute manufacturer and is not interchangeable.