FSDM311 Equivalent & Substitute Parts

Part Overview

The FSDM311 is an offline switch flyback converter IC manufactured by onsemi, designed for isolated power management applications. This 8-DIP through-hole component operates at 67kHz switching frequency with 13W power output capability and 650V breakdown voltage rating. The FSDM311 is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts must maintain compatibility across electrical specifications, package form factor, and thermal operating ranges to ensure direct replacement functionality.

Substiute Parts

FSDM311

onsemiIn Stock: 35167FSDM311 Datasheet

Current PartRFQ

FSL106MR

onsemiIn Stock: 2265FSL106MR Datasheet

MFR RecommendedRFQ

FSDM311A

onsemiIn Stock: 1910FSDM311A Datasheet

Parametric EquivalentRFQ

FSQ100

onsemiIn Stock: 35397FSQ100 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the FSDM311 is determined by strict parameter matching across the following critical specifications:

Electrical Compatibility Requirements:

• Voltage breakdown rating: 650V (exact match required)
• Switching frequency: 67kHz (exact match required)
• Topology: Flyback (exact match required)
• Output isolation: Isolated (exact match required)
• Internal switch presence: Yes (exact match required)

Mechanical Compatibility Requirements:

• Package type: 8-DIP (0.300", 7.62mm) (exact match required)
• Mounting type: Through Hole (exact match required)

Regulatory Compliance:

• RoHS3 compliance required
• REACH unaffected status required

Substitute parts are classified into two categories: MFR Recommended (active product status preferred) and Parametric Equivalents (matching electrical and mechanical specifications).

Parameter Comparison

Engineering Selection Recommendations

FSL106MR (MFR Recommended Substitute): FSL106MR is the manufacturer-recommended substitute with active product status, ensuring long-term availability and ongoing manufacturing support. This part maintains identical topology, package, and core electrical specifications. The extended supply voltage range (8V ~ 26V versus 7V ~ 20V) and expanded operating temperature range (-40°C ~ 105°C versus -25°C ~ 85°C) provide enhanced design flexibility. The addition of short-circuit protection in the fault protection feature set offers improved system robustness. The 10W power rating and 77% duty cycle represent minor deviations from the original specification but remain within the same functional class. ROHS3 compliance and REACH unaffected status confirm regulatory alignment.

FSDM311A (Parametric Equivalent): FSDM311A provides exact electrical and mechanical parameter matching to the FSDM311, including identical voltage supply range, duty cycle, power rating, and operating temperature specifications. This part is classified as obsolete, matching the original part status. Full parameter equivalence ensures direct functional replacement without design modification. ROHS3 compliance and REACH unaffected status maintain regulatory requirements.

FSQ100 (Parametric Equivalent): FSQ100 delivers complete electrical and mechanical specification alignment with the FSDM311, including identical supply voltage range, duty cycle, power output, and operating temperature range. This part is classified as obsolete. Full parameter equivalence supports direct substitution without circuit redesign. ROHS3 compliance and REACH unaffected status satisfy regulatory obligations.

Frequently Asked Questions (FAQ)

Q: Can FSL106MR be used as a direct replacement for FSDM311 in existing designs? A: FSL106MR maintains identical topology, package form factor, and core electrical specifications (650V breakdown, 67kHz switching frequency, isolated output). The extended supply voltage range and operating temperature range are backward compatible with FSDM311 designs. The addition of short-circuit protection enhances system protection without affecting compatibility. Direct substitution is supported.

Q: What is the difference between the MFR Recommended substitute and Parametric Equivalents? A: FSL106MR is the manufacturer-recommended substitute with active product status, ensuring ongoing availability and support. FSDM311A and FSQ100 are parametric equivalents with obsolete status, providing exact specification matching but without active manufacturing support. Selection depends on availability requirements and design timeline.

Q: Why does FSL106MR have different power and duty cycle specifications? A: FSL106MR operates at 10W power output with 77% duty cycle, compared to FSDM311's 13W and 67% duty cycle. These differences reflect design optimization in the newer active product. The extended supply voltage range (8V ~ 26V) and operating temperature range (-40°C ~ 105°C) compensate for the lower power rating in many applications. Circuit design validation is required if the original design depends on the full 13W capability.

Q: Are all substitute parts available in the same packaging? A: All substitute parts (FSL106MR, FSDM311A, FSQ100) are packaged in 8-DIP (0.300", 7.62mm) through-hole format, identical to the FSDM311. Direct PCB compatibility is maintained without layout modification.

Q: Do all substitute parts meet the same regulatory requirements? A: All substitute parts are ROHS3 compliant and REACH unaffected, matching the regulatory status of the FSDM311. Compliance documentation is available from onsemi for each part number.

Q: Which substitute should be selected for new designs? A: FSL106MR is recommended for new designs due to active product status, ensuring long-term availability and manufacturing continuity. The extended operating temperature range and enhanced fault protection features provide additional design margin.