MMST4401-TP Equivalent & Substitute Parts

Part Overview

The MMST4401-TP is an NPN bipolar junction transistor manufactured by Micro Commercial Co, designed for general-purpose switching and amplification applications. This surface mount device operates at 40 V collector-emitter breakdown voltage with a maximum collector current of 600 mA and 200 mW power dissipation. The part is currently active in production with 2343 units in stock. Substitute parts are identified when equivalent electrical performance, mechanical compatibility, and package specifications align with the original component, enabling direct replacement in circuit designs without functional degradation.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Collector Current (Max)	600	mA
Collector-Emitter Breakdown Voltage (Max)	40	V
Power Dissipation (Max)	200	mW
Transition Frequency	250	MHz
DC Current Gain (hFE Min)	100	@ 150mA, 1V
Package Type	SOT-323 (SC-70)	—
Mounting Type	Surface Mount	—
Operating Temperature Range	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the MMST4401-TP is determined by strict alignment of the following electrical and mechanical parameters:

Primary Substitution Criteria:

Transistor type: NPN configuration
Collector current rating: 600 mA maximum
Collector-emitter breakdown voltage: 40 V maximum
Power dissipation: 200 mW or greater
Transition frequency: 250 MHz or greater
DC current gain (hFE): 100 minimum at specified test conditions
Package: SOT-323 (SC-70) surface mount
Mounting: Surface mount technology

Substitute Classification:

Upgrade Substitutes (PMST4401,115 and PMST4401,135): These parts meet or exceed all primary electrical parameters of the MMST4401-TP. Both are manufactured by Nexperia USA Inc. and carry AEC-Q101 automotive qualification. These parts are direct replacements with enhanced specifications in specific parameters.

Similar Substitute (MMBT2222AWT3G): This onsemi part meets the core electrical requirements with identical collector current and breakdown voltage ratings. The transition frequency is higher at 300 MHz. Power dissipation is rated at 150 mW, which is lower than the original part. This part is classified as similar rather than direct upgrade due to the reduced power rating.

Parameter Comparison

Parameter	MMST4401-TP (Main)	PMST4401,115 (Upgrade)	PMST4401,135 (Upgrade)	MMBT2222AWT3G (Similar)
Manufacturer	Micro Commercial Co	Nexperia USA Inc.	Nexperia USA Inc.	onsemi
Collector Current (Max)	600 mA	600 mA	600 mA	600 mA
Collector-Emitter Breakdown Voltage (Max)	40 V	40 V	40 V	40 V
Power Dissipation (Max)	200 mW	200 mW	200 mW	150 mW
Transition Frequency	250 MHz	250 MHz	250 MHz	300 MHz
DC Current Gain (hFE Min)	100 @ 150mA, 1V	100 @ 150mA, 1V	100 @ 150mA, 1V	100 @ 150mA, 10V
Vce Saturation (Max)	400mV @ 15mA, 150mA	750mV @ 50mA, 500mA	750mV @ 50mA, 500mA	1V @ 50mA, 500mA
Collector Cutoff Current (Max)	100 nA	50 nA	50 nA	—
Package	SOT-323	SOT-323	SOT-323	SC-70-3 (SOT323)
Operating Temperature (Max)	150°C	150°C	150°C	150°C
Product Status	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Automotive Grade	—	AEC-Q101	AEC-Q101	—

Engineering Selection Recommendations

PMST4401,115 and PMST4401,135 (Upgrade Substitutes): Both Nexperia parts are direct functional replacements for the MMST4401-TP. These parts maintain identical electrical performance across all critical parameters: 600 mA collector current, 40 V breakdown voltage, 250 MHz transition frequency, and 200 mW power dissipation. Both parts carry AEC-Q101 automotive qualification, indicating compliance with automotive reliability standards. The Nexperia parts feature improved collector cutoff current specifications (50 nA versus 100 nA) and are suitable for applications requiring automotive-grade components. All three parts are ROHS3 compliant and carry unlimited moisture sensitivity rating (MSL 1).

MMBT2222AWT3G (Similar Substitute): The onsemi MMBT2222AWT3G meets the core electrical requirements of the MMST4401-TP with identical collector current and breakdown voltage ratings. This part features a higher transition frequency of 300 MHz, which provides improved high-frequency performance. However, the maximum power dissipation is rated at 150 mW, which is 25% lower than the original 200 mW specification. Selection of this part is appropriate only when circuit power dissipation requirements do not exceed 150 mW. The part is ROHS3 compliant and carries unlimited moisture sensitivity rating. This part does not carry automotive qualification.

Frequently Asked Questions (FAQ)

Q: Can PMST4401,115 or PMST4401,135 be used as direct replacements for MMST4401-TP?

A: Yes. Both Nexperia parts meet or exceed all electrical specifications of the MMST4401-TP. They share identical collector current (600 mA), breakdown voltage (40 V), power dissipation (200 mW), and transition frequency (250 MHz) ratings. The SOT-323 package is mechanically compatible. Both parts are active in production and ROHS3 compliant.

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

A: Both parts are manufactured by Nexperia USA Inc. and carry identical electrical specifications. The suffix designations (,115 and ,135) indicate different packaging or distribution variants. From an electrical and functional standpoint, both parts are equivalent substitutes for the MMST4401-TP.

Q: Can MMBT2222AWT3G replace MMST4401-TP in all applications?

A: MMBT2222AWT3G is suitable for applications where power dissipation does not exceed 150 mW. The part meets the collector current, breakdown voltage, and DC current gain requirements. However, the reduced power rating must be evaluated against circuit design requirements. Applications operating at the full 200 mW specification of the original part require confirmation that the 150 mW rating is sufficient.

Q: Are all substitute parts available in the same packaging?

A: Yes. MMST4401-TP, PMST4401,115, PMST4401,135, and MMBT2222AWT3G are all supplied in SOT-323 (SC-70) surface mount packages. The mechanical footprint and pin configuration are identical, enabling direct board-level substitution without layout modifications.

Q: Do the substitute parts carry automotive qualification?

A: PMST4401,115 and PMST4401,135 carry AEC-Q101 automotive qualification. MMBT2222AWT3G does not carry automotive qualification. Selection of automotive-qualified parts is required for applications subject to automotive reliability standards.

Q: What is the operating temperature range for substitute parts?

A: PMST4401,115 and PMST4401,135 operate from -55°C to 150°C (junction temperature). MMBT2222AWT3G operates from -55°C to 150°C (junction temperature). All parts support the same temperature range as the original MMST4401-TP.

Q: Are all parts RoHS compliant?

A: Yes. MMST4401-TP, PMST4401,115, PMST4401,135, and MMBT2222AWT3G are all ROHS3 compliant. All parts carry unlimited moisture sensitivity rating (MSL 1).

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