AP65550FN-7 Equivalent & Substitute Parts

Part Overview

The AP65550FN-7 is a buck switching regulator IC manufactured by Diodes Incorporated, designed for positive adjustable step-down voltage regulation with a 5A 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, making it suitable for various power management applications requiring compact surface-mount solutions.

The AP65550FN-7 is classified as obsolete. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production or maintenance of systems utilizing this regulator.

Substiute Parts

AP65550FN-7

Diodes IncorporatedIn Stock: 7157AP65550FN-7 Datasheet

Current PartRFQ

TPS54622RHLR

Texas InstrumentsIn Stock: 65410TPS54622RHLR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AP65550FN-7 is determined by the following critical parameters:

• Topology & Function: Buck (step-down) switching regulator with positive adjustable output
• Input Voltage Compatibility: Minimum 4.5V input support; maximum input voltage must equal or exceed 18V
• Output Voltage Range: Adjustable output capability spanning at least 0.76V to 6V
• Output Current Rating: Minimum 5A continuous output current capability
• Synchronous Rectification: Presence of integrated synchronous rectifier for efficiency
• Mounting & Package: Surface-mount technology with exposed pad design
• Regulatory Compliance: ROHS3 compliance and EAR99 classification

The TPS54622RHLR from Texas Instruments meets these substitution criteria while offering enhanced specifications in certain parameters.

Parameter Comparison

Engineering Selection Recommendations

The TPS54622RHLR is a qualified substitute for the AP65550FN-7 based on the following engineering criteria:

Functional Compatibility: Both devices implement buck topology with positive adjustable output configuration and integrated synchronous rectification. The TPS54622RHLR supports the full output voltage range required by the AP65550FN-7 (0.76V to 6V falls within its 0.6V to 15V range).

Current Capability: The TPS54622RHLR provides 6A output current, exceeding the 5A requirement of the AP65550FN-7, ensuring adequate headroom for load transients and thermal margin.

Input Voltage Compatibility: Both devices accept 4.5V minimum input. The TPS54622RHLR operates to 17V maximum input, which is within 1V of the AP65550FN-7's 18V maximum. This minor difference is acceptable for most applications operating below 17V.

Regulatory Compliance: Both parts maintain ROHS3 compliance and EAR99 classification, ensuring equivalent regulatory standing.

Product Status: The TPS54622RHLR holds active product status with extensive inventory availability (65,300 pcs), providing long-term supply security compared to the obsolete AP65550FN-7.

Package Consideration: The TPS54622RHLR uses a 14-VFQFN package versus the 10-UFDFN of the original part. PCB layout modification is required to accommodate the different pin count and footprint.

Frequently Asked Questions (FAQ)

Q: Can the TPS54622RHLR directly replace the AP65550FN-7 without circuit modifications?

A: The TPS54622RHLR is functionally compatible for buck regulation with adjustable output voltage and current capability. However, the package change from 10-UFDFN to 14-VFQFN requires PCB layout redesign. Feedback network resistor values may require adjustment due to different internal reference voltage (0.6V vs. 0.76V), necessitating recalculation of output voltage divider networks.

Q: What is the significance of the switching frequency difference between these parts?

A: The AP65550FN-7 operates at fixed 650kHz, while the TPS54622RHLR provides programmable frequency from 200kHz to 1.6MHz. This allows optimization of output filter size and efficiency for specific application requirements. Fixed 650kHz operation can be maintained by appropriate frequency-setting resistor selection on the TPS54622RHLR.

Q: Does the higher maximum junction temperature of the TPS54622RHLR affect thermal design?

A: The TPS54622RHLR's 150°C maximum junction temperature (versus 85°C ambient for AP65550FN-7) provides improved thermal margin and reliability in elevated ambient conditions. This does not require design changes but allows operation in higher temperature environments.

Q: Are there supply chain advantages to using the TPS54622RHLR?

A: Yes. The TPS54622RHLR maintains active product status with 65,300 units in stock, compared to the obsolete AP65550FN-7 with limited remaining inventory. This ensures long-term availability and supports production continuity.

Q: What is the impact of the Moisture Sensitivity Level difference?

A: The AP65550FN-7 has MSL 1 (unlimited shelf life), while the TPS54622RHLR has MSL 2 (1-year shelf life). The TPS54622RHLR requires standard moisture control during storage and handling per IPC-A-610 guidelines, representing standard industry practice with no functional impact.