MP6922DS-LF Equivalent & Substitute Parts

Part Overview

The MP6922DS-LF is an active secondary-side controller IC manufactured by Monolithic Power Systems Inc., designed for power supply applications requiring isolated feedback control. This component operates within a supply voltage range of 8V to 24V and is housed in a 14-SOIC surface mount package. The part maintains Active product status with full RoHS3 compliance and REACH unaffected classification, making it suitable for current production designs.

Secondary-side controller ICs are critical components in isolated power supply topologies where direct feedback from the output must be communicated across an isolation barrier. Identifying equivalent parts becomes necessary when addressing supply chain constraints, lead time requirements, or design optimization needs while maintaining functional and electrical compatibility.

Substiute Parts

MP6922DS-LF

Monolithic Power Systems Inc.In Stock: 1109MP6922DS-LF Datasheet

Current PartRFQ

AP3108LGSTR-G1

Diodes IncorporatedIn Stock: 30392AP3108LGSTR-G1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of secondary-side controller ICs is determined by functional equivalence within the following parameter constraints:

• Functional Application: Both parts must serve as secondary-side controllers for isolated power supply feedback
• Supply Voltage Compatibility: The substitute part's supply voltage range must encompass or overlap with the original part's operating range (8V ~ 24V)
• Surface Mount Packaging: Both parts must use surface mount technology to maintain PCB assembly compatibility
• Thermal Operating Range: The substitute must support the required temperature range or a superset thereof
• Regulatory Compliance: Both parts must maintain RoHS3 compliance and REACH unaffected status for equivalent regulatory standing
• Lead Count and Pinout: Physical package differences require design-level verification but do not preclude substitution if functional requirements are met

The AP3108LGSTR-G1 qualifies as a substitute based on these criteria, despite differences in package type (9-SSOP vs. 14-SOIC) and specific electrical ratings.

Parameter Comparison

Engineering Selection Recommendations

Both the MP6922DS-LF and AP3108LGSTR-G1 maintain Active product status with identical regulatory compliance profiles (RoHS3 Compliant, REACH Unaffected). Selection between these parts should be based on the following engineering considerations:

Supply Voltage Range: The AP3108LGSTR-G1 operates across 10V ~ 28V, which overlaps the MP6922DS-LF range of 8V ~ 24V. Applications requiring operation below 10V supply voltage cannot use the AP3108LGSTR-G1 as a direct substitute.

Operating Temperature: The MP6922DS-LF supports -40°C ~ 125°C operation, while the AP3108LGSTR-G1 is rated to -40°C ~ 85°C. Designs requiring operation above 85°C must retain the MP6922DS-LF.

Supply Current: The AP3108LGSTR-G1 draws 1.7 mA compared to the MP6922DS-LF's 6 mA, representing a 72% reduction in quiescent current consumption.

Package Differences: The transition from 14-SOIC to 9-SSOP requires PCB layout modification and pinout verification. The different lead counts necessitate schematic and layout redesign.

Both parts carry equivalent compliance certifications and maintain Active production status, supporting long-term design viability.

Frequently Asked Questions (FAQ)

Q: Can the AP3108LGSTR-G1 replace the MP6922DS-LF in all applications?

A: No. The AP3108LGSTR-G1 cannot be used in applications requiring supply voltages below 10V, as its minimum supply voltage is 10V compared to the MP6922DS-LF's 8V minimum. Additionally, applications operating above 85°C ambient temperature require the MP6922DS-LF due to its extended temperature rating to 125°C.

Q: What design changes are required when substituting the AP3108LGSTR-G1?

A: The package change from 14-SOIC to 9-SSOP requires PCB layout redesign, including footprint modification and trace routing adjustments. Pinout verification is mandatory, as the lead count differs (14 leads vs. 9 leads). Schematic updates must reflect the new part number and package designation.

Q: Are both parts suitable for new production designs?

A: Yes. Both the MP6922DS-LF and AP3108LGSTR-G1 maintain Active product status, indicating current manufacturing availability and suitability for new designs. Both carry RoHS3 compliance and REACH unaffected classification.

Q: What is the significance of the different MSL ratings?

A: The MP6922DS-LF carries MSL 2 (1 Year), while the AP3108LGSTR-G1 carries MSL 3 (168 Hours). MSL 3 requires more stringent moisture control during storage and handling. The AP3108LGSTR-G1 has a shorter shelf life before requiring baking if exposed to moisture.

Q: Does the lower supply current of the AP3108LGSTR-G1 affect circuit performance?

A: The 1.7 mA supply current of the AP3108LGSTR-G1 versus 6 mA for the MP6922DS-LF represents reduced quiescent power consumption. This difference is a characteristic of the device design and does not indicate reduced functionality. Functional equivalence must be verified through datasheet comparison of control characteristics and feedback mechanisms.