FMMT718-TP Equivalent & Substitute Parts

Part Overview

The FMMT718-TP is an active-status PNP bipolar junction transistor manufactured by Micro Commercial Co, designed for surface mount applications in the SOT-23 package. This component operates at a maximum collector current of 1.5 A and collector-emitter breakdown voltage of 20 V, with a maximum power dissipation of 350 mW. The device is specified for general-purpose switching and amplification circuits requiring PNP transistor functionality in compact form factors.

Substitute parts become necessary when the primary component experiences supply constraints, extended lead times, or when design flexibility permits selection from multiple qualified sources meeting identical electrical and mechanical specifications.

Substiute Parts

FMMT718-TP

Micro Commercial CoIn Stock: 836FMMT718-TP Datasheet

Current PartRFQ

FMMT718TC

Diodes IncorporatedIn Stock: 10910FMMT718TC Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FMMT718-TP is permissible with components meeting all of the following criteria:

Mandatory Electrical Parameters:

• Transistor Type: PNP
• Current - Collector (Ic) (Max): 1.5 A (minimum)
• Voltage - Collector Emitter Breakdown (Max): 20 V (minimum)
• Vce Saturation (Max) @ Ib, Ic: 220 mV @ 50 mA, 1.5 A (maximum)
• Current - Collector Cutoff (Max): 100 nA (maximum)
• DC Current Gain (hFE) (Min) @ Ic, Vce: 300 @ 100 mA, 2 V (minimum)

Mandatory Mechanical Parameters:

• Package / Case: TO-236-3, SC-59, SOT-23-3
• Mounting Type: Surface Mount

Mandatory Compliance Parameters:

• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

The FMMT718TC manufactured by Diodes Incorporated satisfies all mandatory electrical, mechanical, and compliance parameters. Enhanced performance characteristics (625 mW maximum power dissipation and 180 MHz transition frequency) exceed the minimum requirements and do not preclude substitution.

Parameter Comparison

Engineering Selection Recommendations

The FMMT718TC from Diodes Incorporated is a direct electrical and mechanical substitute for the FMMT718-TP. Both components maintain active product status and full ROHS3 compliance with identical moisture sensitivity classification.

Selection between these parts is determined by availability, supply chain requirements, and design margin considerations. The FMMT718TC provides enhanced performance headroom with 625 mW maximum power dissipation compared to 350 mW for the FMMT718-TP, and 180 MHz transition frequency compared to 150 MHz. These performance enhancements do not introduce incompatibility and support designs requiring additional thermal or frequency margin.

Both components are qualified for the identical operating temperature range (-55°C to 150°C junction temperature) and package form factor (SOT-23-3 surface mount). No circuit redesign or board layout modification is required when substituting between these parts.

Frequently Asked Questions (FAQ)

Q: Can FMMT718TC replace FMMT718-TP in existing designs without modification?

A: Yes. The FMMT718TC meets or exceeds all electrical specifications of the FMMT718-TP, including collector current (1.5 A), breakdown voltage (20 V), saturation voltage (220 mV), current gain (300 minimum), and operating temperature range (-55°C to 150°C). The identical SOT-23-3 package and surface mount configuration require no board layout changes.

Q: What are the key electrical parameters that define substitution eligibility?

A: Substitution eligibility is determined by six critical electrical parameters: PNP transistor type, maximum collector current of 1.5 A, maximum collector-emitter breakdown voltage of 20 V, saturation voltage of 220 mV at specified bias conditions, maximum collector cutoff current of 100 nA, and minimum DC current gain of 300 at 100 mA collector current and 2 V collector-emitter voltage.

Q: Are there any compliance or environmental differences between these parts?

A: No. Both FMMT718-TP and FMMT718TC carry identical ROHS3 compliance status and Moisture Sensitivity Level 1 (unlimited) classification. Both are REACH unaffected and carry EAR99 export classification.

Q: Does the higher power rating of FMMT718TC (625 mW vs. 350 mW) affect circuit compatibility?

A: No. Higher maximum power dissipation rating does not affect circuit operation or compatibility. The FMMT718TC can dissipate more power without thermal degradation, providing additional design margin in applications approaching the thermal limits of the original FMMT718-TP specification.

Q: Are the package dimensions identical between FMMT718-TP and FMMT718TC?

A: Yes. Both components use the SOT-23-3 package (also designated TO-236-3 or SC-59), which specifies identical physical dimensions, lead spacing, and surface mount footprint. No PCB redesign is required.

Q: What is the significance of the transition frequency difference (150 MHz vs. 180 MHz)?

A: The FMMT718TC transition frequency of 180 MHz exceeds the FMMT718-TP specification of 150 MHz. This enhanced frequency response provides additional margin for high-speed switching applications and does not introduce incompatibility with designs specified for 150 MHz operation.