MMST6427-7-F Equivalent & Substitute Parts

Part Overview

The MMST6427-7-F is an NPN Darlington bipolar junction transistor manufactured by Diodes Incorporated, designed for surface mount applications in the SOT-323 package. This component operates at a maximum collector voltage of 40 V with a collector current rating of 500 mA and maximum power dissipation of 200 mW. The device is classified as Active product status and is RoHS3 compliant with unlimited moisture sensitivity level (MSL 1).

Substitute parts are identified when equivalent electrical performance can be achieved within the specified parameter ranges while maintaining compatibility with the SOT-323 surface mount package and operating temperature requirements. Substitution becomes necessary due to component availability, supply chain considerations, or design optimization requirements.

Key Parameters

Parameter	MMST6427-7-F	Unit
Transistor Type	NPN - Darlington	—
Collector Current (Ic) Maximum	500	mA
Collector-Emitter Breakdown Voltage (Max)	40	V
Vce Saturation (Max)	1.5	V @ 500µA, 500mA
DC Current Gain (hFE) Minimum	20000	@ 100mA, 5V
Power Dissipation Maximum	200	mW
Operating Temperature Range	-55 to 150	°C
Package Type	SOT-323 (SC-70)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the MMST6427-7-F is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Package Type: SOT-323 (SC-70) surface mount configuration
Mounting Type: Surface mount
Transistor Classification: NPN type
Collector-Emitter Breakdown Voltage: Minimum 40 V
Collector Current Rating: Minimum 500 mA
Power Dissipation: Minimum 200 mW
Operating Temperature Range: Must encompass -55°C to 150°C or higher
RoHS Compliance: ROHS3 compliant
Moisture Sensitivity Level: MSL 1 (Unlimited)

Substitution Logic: The MMST6427-7-F is an NPN Darlington transistor with high current gain (hFE minimum 20000). Substitute parts are classified as standard NPN transistors with equivalent or superior electrical ratings. Darlington-specific substitutes are not required; standard NPN transistors meeting or exceeding the voltage, current, and power specifications are functionally compatible. The high current gain of the original device is not a limiting factor for substitution, as standard NPN transistors with lower gain can perform equivalent switching and amplification functions in most applications.

Parameter Comparison

Parameter	MMST6427-7-F	CMST2222A TR PBFREE	PMST2222,115	PMST2222A,115	PMST4401,115	PMST4401,135	Unit
Manufacturer	Diodes Inc.	Central Semiconductor	NXP Semiconductors	Nexperia USA Inc.	Nexperia USA Inc.	Nexperia USA Inc.	—
Transistor Type	NPN - Darlington	NPN	NPN	NPN	NPN	NPN	—
Ic (Max)	500	600	600	600	600	600	mA
Vce Breakdown (Max)	40	40	30	40	40	40	V
Vce Saturation (Max)	1.5	1.0	1.6	1.0	0.75	0.75	V
Power Dissipation (Max)	200	275	200	200	200	200	mW
Operating Temperature (Max)	150	150	150	150	150	150	°C
Operating Temperature (Min)	-55	-65	Not specified	Not specified	Not specified	Not specified	°C
Package	SOT-323	SOT-323	SOT-323	SOT-323	SOT-323	SOT-323	—
RoHS Status	ROHS3	ROHS3	Not specified	ROHS3	ROHS3	ROHS3	—
Automotive Grade	No	No	Yes (AEC-Q101)	Yes (AEC-Q101)	Yes (AEC-Q101)	Yes (AEC-Q101)	—

Engineering Selection Recommendations

CMST2222A TR PBFREE (Central Semiconductor Corp) This substitute meets all mandatory electrical and package requirements. It provides 600 mA collector current capacity, 40 V breakdown voltage, and 275 mW power dissipation, all exceeding the MMST6427-7-F specifications. The device is RoHS3 compliant with MSL 1 rating. Operating temperature range extends to -65°C, providing enhanced low-temperature performance. This part is suitable for general-purpose applications where automotive qualification is not required.

PMST2222,115 (NXP Semiconductors) This substitute provides 600 mA collector current and 200 mW power dissipation matching the original device. The collector-emitter breakdown voltage is 30 V, which is below the 40 V specification of the MMST6427-7-F. This part is qualified to AEC-Q101 automotive standard and carries automotive grade designation. Selection of this part requires verification that the 30 V breakdown voltage is acceptable for the application circuit. This part is suitable for automotive applications where the reduced voltage rating does not present a constraint.

PMST2222A,115 (Nexperia USA Inc.) This substitute provides equivalent electrical performance with 600 mA collector current, 40 V breakdown voltage, and 200 mW power dissipation. The device is RoHS3 compliant, MSL 1 rated, and qualified to AEC-Q101 automotive standard. Vce saturation is 1.0 V, which is lower than the original 1.5 V, indicating improved switching efficiency. This part is suitable for both general-purpose and automotive applications.

PMST4401,115 and PMST4401,135 (Nexperia USA Inc.) These substitutes provide 600 mA collector current, 40 V breakdown voltage, and 200 mW power dissipation. Both variants are RoHS3 compliant, MSL 1 rated, and qualified to AEC-Q101 automotive standard. Vce saturation is 750 mV, providing superior switching performance compared to the original device. The primary difference between the two variants is the packaging designation (,115 versus ,135), which reflects different tape and reel configurations. These parts are suitable for automotive and general-purpose applications requiring optimized saturation characteristics.

Frequently Asked Questions (FAQ)

Q: Can the PMST2222,115 substitute for the MMST6427-7-F in all applications?

A: The PMST2222,115 meets most electrical requirements but has a collector-emitter breakdown voltage of 30 V compared to the 40 V specification of the MMST6427-7-F. This part is suitable only for applications where the circuit voltage does not exceed 30 V. For circuits operating at voltages between 30 V and 40 V, this substitute is not appropriate.

Q: What is the difference between PMST4401,115 and PMST4401,135?

A: Both parts are electrically identical with the same electrical specifications. The designation difference (,115 versus ,135) indicates different tape and reel packaging configurations. Selection between these variants depends on the specific tape and reel requirements of the assembly equipment used in manufacturing.

Q: Is the MMST6427-7-F a Darlington transistor, and do all substitutes need to be Darlington devices?

A: The MMST6427-7-F is classified as an NPN Darlington transistor with a minimum DC current gain of 20000. Substitute parts listed are standard NPN transistors with lower current gain specifications. Standard NPN transistors are functionally compatible because the high current gain of the original device is not a limiting factor in most switching and amplification applications. The substitutes provide equivalent or superior electrical performance within the specified voltage, current, and power parameters.

Q: Are all listed substitutes RoHS3 compliant?

A: CMST2222A TR PBFREE, PMST2222A,115, PMST4401,115, and PMST4401,135 are explicitly RoHS3 compliant. PMST2222,115 does not specify RoHS status in the provided data. Verification of RoHS compliance is required if this part is selected for applications with RoHS compliance requirements.

Q: Which substitute parts carry automotive qualification?

A: PMST2222,115, PMST2222A,115, PMST4401,115, and PMST4401,135 are all qualified to AEC-Q101 automotive standard and carry automotive grade designation. CMST2222A TR PBFREE does not carry automotive qualification. Selection of automotive-qualified parts is required for applications subject to automotive industry standards.

Q: What is the significance of the lower Vce saturation voltage in the PMST4401 variants?

A: The PMST4401,115 and PMST4401,135 have Vce saturation of 750 mV compared to 1.5 V in the MMST6427-7-F. Lower saturation voltage indicates reduced voltage drop across the transistor in the saturated state, resulting in lower power dissipation and improved switching efficiency. This characteristic is beneficial in applications where power efficiency is a design consideration.

Q: Can the CMST2222A TR PBFREE be used in automotive applications?

A: The CMST2222A TR PBFREE does not carry automotive grade designation or AEC-Q101 qualification. This part is suitable for general-purpose applications only. For automotive applications, selection of AEC-Q101 qualified parts (PMST2222,115, PMST2222A,115, PMST4401,115, or PMST4401,135) is required.

Q: Are all substitutes available in the same tape and reel packaging as the MMST6427-7-F?

A: The MMST6427-7-F is supplied in Tape & Reel (TR) packaging. CMST2222A TR PBFREE and PMST2222A,115, PMST4401,115, and PMST4401,135 are all supplied in Tape & Reel packaging. PMST2222,115 is supplied in Bulk packaging. For automated assembly processes requiring tape and reel format, PMST2222,115 is not suitable without repackaging.

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