AP65550SP-13 Equivalent & Substitute Parts

Part Overview

The AP65550SP-13 is a buck switching regulator IC manufactured by Diodes Incorporated, designed for positive adjustable step-down voltage regulation with 5A output current capability. This part operates across a 4.5V to 18V input range and delivers adjustable output from 0.76V to 6V at 650kHz switching frequency in an 8-SOIC package with exposed pad.

The AP65550SP-13 is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this regulator topology.

Substiute Parts

AP65550SP-13

Diodes IncorporatedIn Stock: 2760AP65550SP-13 Datasheet

Current PartRFQ

AOZ6605PI

Alpha & Omega Semiconductor Inc.In Stock: 4226AOZ6605PI Datasheet

MFR RecommendedRFQ

RT7239GSP

Richtek USA Inc.In Stock: 40677RT7239GSP Datasheet

MFR RecommendedRFQ

TPS54527DDA

Texas InstrumentsIn Stock: 1877TPS54527DDA Datasheet

MFR RecommendedRFQ

TPS54527DDAR

Texas InstrumentsIn Stock: 15945TPS54527DDAR Datasheet

MFR RecommendedRFQ

TPS54528DDA

Texas InstrumentsIn Stock: 1058TPS54528DDA Datasheet

MFR RecommendedRFQ

TPS54528DDAR

Texas InstrumentsIn Stock: 29296TPS54528DDAR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the AP65550SP-13 are qualified based on the following critical parameters that determine functional equivalence:

Core Electrical Parameters:

• Input voltage range: 4.5V to 18V minimum
• Output current capability: 5A minimum
• Switching frequency: 650kHz
• Synchronous rectifier topology: Required
• Output type: Adjustable positive regulation
• Operating temperature range: -40°C to 85°C minimum

Package & Mechanical Compatibility:

• Surface mount 8-pin SOIC package with exposed pad
• Physical dimensions: 0.154" width, 3.90mm width specification

Compliance & Environmental:

• ROHS3 compliance required
• REACH unaffected status

Substitute parts meeting these criteria are grouped by manufacturer and product status. Parts with active product status are prioritized for new designs, while obsolete alternatives provide direct pin-compatible replacements.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts listed are active products with ROHS3 compliance and REACH unaffected status, providing long-term supply chain viability compared to the obsolete AP65550SP-13.

Primary Substitutes (Closest Electrical Match):

• TPS54527DDAR and TPS54528DDAR (Texas Instruments) match the AP65550SP-13 output voltage range (0.76V to 6V) exactly and are available in high inventory quantities with active product status. These parts use 8-PowerSOIC packaging, which is mechanically compatible with standard 8-SOIC footprints.
• RT7239GSP (Richtek USA) provides equivalent electrical performance with output range of 0.765V to 8V and maintains the 8-SOIC package form factor with higher inventory availability.

Alternative Substitute (Extended Output Range):

• AOZ6605PI (Alpha & Omega Semiconductor) offers the same 5A output current and 650kHz switching frequency with an extended maximum output voltage of 15.3V, providing design flexibility for applications requiring higher output voltages. This part maintains the 8-SOIC package specification and unlimited MSL rating.

Packaging Consideration: Texas Instruments parts (TPS54527 and TPS54528 series) use 8-PowerSOIC packaging rather than standard 8-SOIC. While mechanically compatible with 8-SOIC footprints, PCB layout verification is recommended to confirm thermal pad alignment and trace routing compatibility.

Frequently Asked Questions (FAQ)

Q: Can TPS54527DDAR and TPS54528DDAR be used interchangeably with AP65550SP-13?

A: Yes. Both parts share identical electrical specifications (0.76V to 6V output, 5A current, 650kHz switching frequency, -40°C to 85°C operating range) and synchronous rectifier topology. The 8-PowerSOIC package is mechanically compatible with 8-SOIC footprints. Verify thermal pad dimensions and PCB layout before production transition.

Q: What is the difference between TPS54527DDA and TPS54527DDAR?

A: Both are identical electrically and functionally. The difference is packaging format: TPS54527DDA is supplied in Bulk, while TPS54527DDAR is supplied in Cut Tape with Digi-Reel. Select based on assembly process requirements.

Q: Is RT7239GSP a direct replacement for AP65550SP-13?

A: RT7239GSP is functionally equivalent with matching input range (4.5V to 18V), output current (5A), and switching frequency (650kHz). The output voltage range extends to 8V maximum compared to 6V for the AP65550SP-13. The 8-SOIC package matches the original part specification. MSL rating is 3 (168 Hours) versus 1 (Unlimited) for the original part.

Q: Why does AOZ6605PI have a higher maximum output voltage (15.3V)?

A: AOZ6605PI is designed for applications requiring extended output voltage capability while maintaining the same 5A current and 650kHz switching frequency. For designs limited to 6V output maximum, this extended range does not affect compatibility. The adjustable output voltage is set by external resistor divider networks.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What is the significance of MSL (Moisture Sensitivity Level) differences?

A: AP65550SP-13 has MSL 1 (Unlimited), while most substitutes have MSL 2 or 3. Lower MSL ratings require stricter moisture control during storage and handling. MSL 2 requires 1-year dry storage capability; MSL 3 requires 168-hour dry storage. Verify storage and assembly procedures align with the selected substitute part's MSL rating.