MMBT2222AWT1 Equivalent & Substitute Parts

Part Overview

The MMBT2222AWT1 is an NPN bipolar junction transistor (BJT) manufactured by onsemi, designed for general-purpose switching and amplification applications. This device features a 40 V collector-emitter breakdown voltage, 600 mA maximum collector current, and 150 mW power dissipation in a surface mount SC-70 (SOT-323) package. The MMBT2222AWT1 is classified as obsolete, which necessitates identification of functionally equivalent active alternatives for new designs and ongoing production requirements.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Collector Current (Max)	600	mA
Collector-Emitter Breakdown Voltage (Max)	40	V
Power Dissipation (Max)	150	mW
Transition Frequency	300	MHz
DC Current Gain (hFE Min)	100	@ 150mA, 10V
Package Type	SC-70, SOT-323	Surface Mount
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the MMBT2222AWT1 is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Matching Parameters:

Transistor type: NPN
Maximum collector current: 600 mA
Maximum collector-emitter breakdown voltage: 40 V
Package: SC-70 or SOT-323 (surface mount)
DC current gain (hFE): minimum 100 @ 150mA, 10V
Transition frequency: 300 MHz or greater

Acceptable Variation Parameters:

Power dissipation: 150 mW or greater
Vce saturation: variations permitted within functional operating range
Operating temperature range: extended ranges acceptable
RoHS compliance: ROHS3 compliant alternatives preferred for new designs

All substitute parts listed maintain identical electrical performance within the specified operating envelope and are pin-compatible in the SOT-323 package configuration.

Parameter Comparison

Parameter	MMBT2222AWT1 (onsemi)	MMBT2222AWT1G (onsemi)	CMST2222A TR PBFREE (Central Semi)	MMST2222A-7-F (Diodes Inc)	MMST4401-7-F (Diodes Inc)	PMST2222A,115 (Nexperia)
Transistor Type	NPN	NPN	NPN	NPN	NPN	NPN
Ic (Max)	600 mA	600 mA	600 mA	600 mA	600 mA	600 mA
Vce Breakdown (Max)	40 V	40 V	40 V	40 V	40 V	40 V
Power (Max)	150 mW	150 mW	275 mW	200 mW	200 mW	200 mW
Frequency - Transition	300 MHz	300 MHz	300 MHz	300 MHz	250 MHz	300 MHz
hFE (Min) @ Ic, Vce	100 @ 150mA, 10V	100 @ 150mA, 10V	100 @ 150mA, 10V	100 @ 150mA, 10V	100 @ 150mA, 1V	100 @ 150mA, 10V
Package	SC-70, SOT-323	SC-70, SOT-323	SC-70, SOT-323	SC-70, SOT-323	SC-70, SOT-323	SC-70, SOT-323
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: MMBT2222AWT1G (onsemi)

The MMBT2222AWT1G is the direct active equivalent manufactured by onsemi. This part maintains identical electrical specifications to the obsolete MMBT2222AWT1 while offering active product status and ROHS3 compliance. The MMBT2222AWT1G is available in Cut Tape and Digi-Reel packaging with 35,100 units in stock, providing supply continuity for production requirements.

Secondary Recommendations:

PMST2222A,115 (Nexperia USA Inc.) — This part is qualified to AEC-Q101 automotive standards and carries Nexperia's automotive-grade designation. Selection is appropriate for applications requiring automotive qualification or extended reliability assurance. Electrical parameters are fully equivalent with 300 MHz transition frequency and 200 mW power rating.

CMST2222A TR PBFREE (Central Semiconductor Corp) — This alternative offers the highest power dissipation rating at 275 mW, providing additional thermal margin in power-constrained applications. ROHS3 compliance and active product status support long-term availability.

MMST2222A-7-F (Diodes Incorporated) — This part provides full electrical equivalence with 300 MHz transition frequency and 200 mW power rating. Active product status and ROHS3 compliance ensure supply continuity.

Conditional Selection: MMST4401-7-F (Diodes Incorporated)

The MMST4401-7-F meets all critical electrical parameters with one exception: transition frequency is specified at 250 MHz versus 300 MHz for the primary part. This part is suitable only for applications where the 300 MHz specification is not a design requirement. The 91,010 unit inventory provides maximum availability.

Frequently Asked Questions (FAQ)

Q: Can MMBT2222AWT1 be directly replaced with MMBT2222AWT1G?

A: Yes. The MMBT2222AWT1G is the active production equivalent with identical electrical specifications, pin configuration, and package type. The primary difference is product status (active versus obsolete) and RoHS compliance (ROHS3 compliant).

Q: What is the difference between the onsemi MMBT2222AWT1G and the Diodes MMST2222A-7-F?

A: Both parts are electrically equivalent with 600 mA collector current, 40 V breakdown voltage, 300 MHz transition frequency, and 100 minimum hFE. The MMBT2222AWT1G offers 150 mW power rating, while MMST2222A-7-F provides 200 mW. Both are ROHS3 compliant and active products. Selection depends on manufacturer preference and supply chain requirements.

Q: Is the MMST4401-7-F a suitable substitute?

A: The MMST4401-7-F meets all critical parameters except transition frequency, which is specified at 250 MHz instead of 300 MHz. This part is suitable only for applications where 300 MHz operation is not required. Verify frequency requirements before selection.

Q: Why is PMST2222A,115 listed as an alternative?

A: The PMST2222A,115 is AEC-Q101 qualified and carries automotive-grade designation from Nexperia. It provides full electrical equivalence with 300 MHz transition frequency and is appropriate for automotive applications or designs requiring automotive-grade component qualification.

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

A: Yes. All substitute parts are available in SC-70 or SOT-323 surface mount packages with identical pin configurations. Packaging format (Tape & Reel versus Cut Tape) varies by manufacturer and supplier, but the physical component package remains compatible across all alternatives.

Q: What is the impact of power dissipation differences between alternatives?

A: The MMBT2222AWT1 is rated at 150 mW. Substitute parts offer 150 mW (MMBT2222AWT1G), 200 mW (MMST2222A-7-F, MMST4401-7-F, PMST2222A,115), or 275 mW (CMST2222A TR PBFREE). Higher power ratings provide additional thermal margin but do not affect electrical performance in applications operating within the original 150 mW specification.

Q: Are all alternatives RoHS compliant?

A: The MMBT2222AWT1 is RoHS non-compliant. All active substitute parts listed (MMBT2222AWT1G, CMST2222A TR PBFREE, MMST2222A-7-F, MMST4401-7-F, PMST2222A,115) are ROHS3 compliant, meeting current environmental and regulatory requirements for new designs.

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