FMMD914TA Equivalent & Substitute Parts

Part Overview

The FMMD914TA is a general-purpose rectifier diode manufactured by Diodes Incorporated, rated for 75 V DC reverse voltage and 75 mA average rectified current in a surface mount SOT-23-3 package. This component is classified as obsolete, making identification of equivalent and substitute parts necessary for ongoing design support, legacy system maintenance, and production continuity. Substitute parts must maintain electrical compatibility within the specified voltage and current parameters while accommodating the physical constraints of the SOT-23-3 package footprint.

Substiute Parts

FMMD914TA

Diodes IncorporatedIn Stock: 18439FMMD914TA Datasheet

Current PartRFQ

MMBD914-7-F

Diodes IncorporatedIn Stock: 1483MMBD914-7-F Datasheet

MFR RecommendedRFQ

CMPD914 TR PBFREE

Central Semiconductor CorpIn Stock: 99564CMPD914 TR PBFREE Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FMMD914TA is determined by the following critical electrical and mechanical parameters:

Mandatory Compatibility Criteria:

• Voltage - DC Reverse (Vr) (Max): Must equal or exceed 75 V
• Package / Case: Must be TO-236-3, SC-59, or SOT-23-3 for mechanical and thermal compatibility
• Mounting Type: Must be Surface Mount
• Operating Temperature Range: Must encompass or exceed the application requirements

Allowable Parameter Variations:

• Current - Average Rectified (Io): Substitute parts may exceed 75 mA, provided the application circuit does not require current limiting below the substitute part's rating
• Reverse Recovery Time (trr): Substitute parts with faster recovery times (lower trr values) are electrically compatible
• Forward Voltage (Vf): Minor variations are acceptable within standard rectifier diode tolerances
• Reverse Leakage Current: Lower leakage values indicate improved performance characteristics

The substitute parts listed below satisfy all mandatory compatibility criteria and provide enhanced or equivalent electrical performance.

Parameter Comparison

Engineering Selection Recommendations

MMBD914-7-F (Diodes Incorporated)

The MMBD914-7-F is an active product with ROHS3 compliance, offering enhanced electrical performance over the obsolete FMMD914TA. This substitute provides 300 mA average rectified current capacity, exceeding the original 75 mA specification, with faster reverse recovery time (4 ns versus 8 ns). The extended operating temperature range (-65°C to 150°C) provides additional thermal margin. This part is suitable for direct replacement in applications where the higher current rating does not introduce circuit design conflicts. The ROHS3 compliance status supports modern manufacturing and environmental regulatory requirements.

CMPD914 TR PBFREE (Central Semiconductor Corp)

The CMPD914 TR PBFREE is an active product with ROHS3 compliance, providing 250 mA average rectified current capacity and matching the original forward voltage characteristics (1 V @ 10 mA). This substitute maintains the original reverse leakage current specification (25 nA @ 20 V) and capacitance (4 pF @ 0 V, 1 MHz), offering electrical performance closely aligned with the FMMD914TA while providing faster reverse recovery (4 ns). The extended operating temperature range (-65°C to 150°C) and ROHS3 compliance support modern production environments. This part is recommended for applications requiring minimal electrical parameter deviation from the original design.

Both substitute parts maintain the SOT-23-3 package specification, ensuring mechanical and thermal compatibility with existing PCB layouts and thermal management designs.

Frequently Asked Questions (FAQ)

Q: Can the MMBD914-7-F replace the FMMD914TA in all applications?

A: The MMBD914-7-F is electrically compatible with the FMMD914TA for all applications operating at or below 75 mA average rectified current. The higher current rating (300 mA) does not create incompatibility. The faster reverse recovery time (4 ns versus 8 ns) improves switching performance. Verify that the application circuit does not depend on the specific forward voltage or reverse leakage characteristics of the original part.

Q: What is the difference between the two substitute parts?

A: Both MMBD914-7-F and CMPD914 TR PBFREE meet the 75 V reverse voltage requirement and SOT-23-3 package specification. The MMBD914-7-F provides higher current capacity (300 mA), while the CMPD914 TR PBFREE maintains closer electrical alignment to the original part's forward voltage and reverse leakage specifications. Both offer faster reverse recovery times and ROHS3 compliance.

Q: Are the substitute parts physically compatible with the original PCB layout?

A: Yes. Both substitute parts use the TO-236-3, SC-59, SOT-23-3 package, which is mechanically and thermally identical to the FMMD914TA package. No PCB layout modifications are required for physical substitution.

Q: What is the significance of the ROHS3 compliance status?

A: ROHS3 compliance indicates that the substitute parts meet current environmental and manufacturing regulations restricting hazardous substances. The original FMMD914TA is RoHS non-compliant. Substitute parts with ROHS3 compliance support modern manufacturing processes and regulatory requirements for new production runs.

Q: Does the extended operating temperature range of the substitute parts affect compatibility?

A: No. The extended operating temperature range (-65°C to 150°C for substitutes versus -55°C to 150°C for the original) provides additional thermal margin and does not create incompatibility. Applications operating within the original temperature range remain fully compatible.

Q: Can I use these substitute parts interchangeably in the same design?

A: Both substitute parts are electrically compatible with the FMMD914TA and with each other within the specified voltage and current parameters. Selection between MMBD914-7-F and CMPD914 TR PBFREE depends on application-specific requirements for current capacity and electrical parameter matching to the original design.