FMMT618-TP Equivalent & Substitute Parts

Part Overview

The FMMT618-TP is an NPN bipolar junction transistor manufactured by Micro Commercial Co, designed for interface applications requiring surface mount implementation. This transistor operates at a maximum collector current of 2.5 A with a collector-emitter breakdown voltage of 20 V and a maximum power dissipation of 350 mW. The device is housed in a SOT-23 package and features a transition frequency of 100 MHz, making it suitable for moderate-speed switching and amplification circuits.

The FMMT618-TP maintains Active product status with 680 pieces currently in stock. Equivalent and substitute parts are identified to provide design flexibility, accommodate supply chain variations, and support alternative sourcing strategies while maintaining electrical and mechanical compatibility within specified parameters.

Substiute Parts

FMMT618-TP

Micro Commercial CoIn Stock: 722FMMT618-TP Datasheet

Current PartRFQ

FMMT618TA

Diodes IncorporatedIn Stock: 54835FMMT618TA Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FMMT618-TP is determined by strict equivalence across the following critical parameters:

Electrical Compatibility Requirements:

• Transistor Type: NPN configuration
• Maximum Collector Current (Ic): 2.5 A minimum
• Collector-Emitter Breakdown Voltage (Vce(BR)CEO): 20 V minimum
• Vce Saturation: 200 mV maximum at specified bias conditions
• Collector Cutoff Current (ICBO): 100 nA maximum
• Operating Temperature Range: -55°C to 150°C minimum

Mechanical Compatibility Requirements:

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

The FMMT618TA from Diodes Incorporated qualifies as a direct substitute. This part maintains identical electrical specifications for collector current, breakdown voltage, saturation voltage, and cutoff current. The package configuration is identical (SOT-23-3), ensuring mechanical compatibility. Enhanced performance characteristics (140 MHz transition frequency versus 100 MHz, and 625 mW power rating versus 350 mW) provide additional design margin without introducing incompatibility.

Parameter Comparison

Engineering Selection Recommendations

FMMT618-TP (Primary Selection)

The FMMT618-TP is the original specified component with Active product status. This part is manufactured by Micro Commercial Co and carries REACH Unaffected compliance status. Selection of this part is appropriate when the original design specification must be maintained and supply availability permits.

FMMT618TA (Substitute Selection)

The FMMT618TA from Diodes Incorporated is a qualified substitute meeting all electrical and mechanical requirements. This part carries ROHS3 Compliant and REACH Unaffected compliance status, with Moisture Sensitivity Level (MSL) rating of 1 (Unlimited). The FMMT618TA demonstrates superior performance characteristics across transition frequency and power dissipation ratings, providing additional design margin. This part is appropriate for applications requiring enhanced performance specifications or when supply constraints necessitate alternative sourcing.

Both parts maintain identical critical electrical parameters (collector current, breakdown voltage, saturation voltage, and cutoff current) and share identical SOT-23-3 package configuration, ensuring direct substitution capability at the circuit board level.

Frequently Asked Questions (FAQ)

Q: Can the FMMT618TA replace the FMMT618-TP in existing designs?

A: Yes. The FMMT618TA meets or exceeds all critical electrical specifications of the FMMT618-TP, including maximum collector current (2.5 A), collector-emitter breakdown voltage (20 V), saturation voltage (200 mV), and cutoff current (100 nA). Both devices use identical SOT-23-3 packaging, enabling direct substitution without circuit board modifications.

Q: What are the key differences between these parts?

A: The FMMT618TA provides enhanced performance in transition frequency (140 MHz versus 100 MHz) and maximum power dissipation (625 mW versus 350 mW). These differences represent performance improvements that do not affect compatibility. DC current gain specifications differ in test conditions but remain compatible for circuit operation.

Q: Are there packaging differences between FMMT618-TP and FMMT618TA?

A: No. Both parts are supplied in SOT-23-3 package configuration (also designated TO-236-3 or SC-59). Mechanical dimensions, pin assignments, and mounting requirements are identical.

Q: What compliance certifications apply to these parts?

A: Both FMMT618-TP and FMMT618TA carry REACH Unaffected status. The FMMT618TA additionally carries ROHS3 Compliant certification and MSL rating of 1 (Unlimited), indicating no moisture sensitivity restrictions.

Q: Which part should be selected for new designs?

A: Either part is suitable for new designs. The FMMT618TA offers performance advantages (higher transition frequency and power rating) that may provide additional design margin. Selection should be based on supply availability, cost considerations, and compliance requirements specific to the application.

Q: Are there temperature operating range differences?

A: No. Both parts operate across the identical temperature range of -55°C to 150°C (junction temperature), ensuring thermal compatibility across all operating conditions.