MMBT2222AT Equivalent & Substitute Parts

Part Overview

The MMBT2222AT is an NPN bipolar junction transistor 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 300 MHz transition frequency in a surface mount SC-89-3 package. The MMBT2222AT is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across critical parameters including collector current, breakdown voltage, saturation characteristics, and frequency response while accommodating different package configurations.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Current - Collector (Ic) Max	600	mA
Voltage - Collector Emitter Breakdown (Max)	40	V
Vce Saturation (Max) @ Ib, Ic	1 V @ 50 mA, 500 mA	—
DC Current Gain (hFE) Min @ Ic, Vce	100 @ 150 mA, 1 V	—
Power - Max	250	mW
Frequency - Transition	300	MHz
Operating Temperature (TJ)	150	°C
Mounting Type	Surface Mount	—
Package / Case	SC-89, SOT-490	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the MMBT2222AT is determined by electrical parameter compatibility and package form factor. The primary substitution criteria are:

Electrical Compatibility Requirements:

Transistor type must be NPN
Collector current (Ic Max) must be ≥ 600 mA
Collector-emitter breakdown voltage (VCEO) must be ≥ 40 V
Vce saturation characteristics must be compatible at specified bias conditions
DC current gain (hFE) minimum must be ≥ 100 at specified conditions
Transition frequency must be ≥ 300 MHz for high-frequency applications

Package and Compliance Considerations:

Surface mount mounting type required
RoHS3 compliance mandatory
MSL rating of 1 (Unlimited) preferred for supply chain flexibility
Active product status preferred for long-term availability

Substitute parts are grouped into two categories: direct electrical equivalents with alternative package options (MMBT2222ALT1G, MMBT2222ATT1G, MMBT2222A_R1_00001, MMBT2222AT-7-F, PMST2222A,115) and functional equivalents with reduced electrical specifications (MMBT2222LT1G, BC846BMB,315).

Parameter Comparison

Part Number	Manufacturer	Ic Max (mA)	VCEO (V)	Vce Sat @ Ib, Ic	hFE Min @ Ic, Vce	Power Max (mW)	Freq - Transition (MHz)	Package	Product Status
MMBT2222AT	onsemi	600	40	1 V @ 50 mA, 500 mA	100 @ 150 mA, 1 V	250	300	SC-89-3	Obsolete
MMBT2222ALT1G	onsemi	600	40	1 V @ 50 mA, 500 mA	100 @ 150 mA, 10 V	225	300	SOT-23-3	Active
MMBT2222ATT1G	onsemi	600	40	1 V @ 50 mA, 500 mA	100 @ 150 mA, 10 V	150	300	SC-75, SOT-416	Active
MMBT2222LT1G	onsemi	600	30	1.6 V @ 50 mA, 500 mA	100 @ 150 mA, 10 V	300	250	SOT-23-3	Active
BC846BMB,315	Nexperia USA Inc.	100	65	200 mV @ 500 µA, 10 mA	200 @ 2 mA, 5 V	250	100	DFN1006B-3	Active
MMBT2222AT-7-F	Diodes Incorporated	600	40	1 V @ 50 mA, 500 mA	100 @ 150 mA, 10 V	150	300	SOT-523	Active
MMBT2222A_R1_00001	Panjit International Inc.	600	40	1 V @ 50 mA, 500 mA	100 @ 150 mA, 10 V	225	—	SOT-23-3	Active
PMST2222A,115	Nexperia USA Inc.	600	40	1 V @ 50 mA, 500 mA	100 @ 150 mA, 10 V	200	300	SOT-323	Active

Engineering Selection Recommendations

Primary Substitutes (Full Electrical Equivalence):

MMBT2222ALT1G, MMBT2222ATT1G, MMBT2222AT-7-F, MMBT2222A_R1_00001, and PMST2222A,115 are direct electrical equivalents to the MMBT2222AT. All maintain the 600 mA collector current, 40 V breakdown voltage, and 300 MHz transition frequency specifications. These parts are manufactured by onsemi, Diodes Incorporated, Panjit International Inc., and Nexperia USA Inc., all with active product status and ROHS3 compliance. Selection among these substitutes is determined by package availability and PCB layout requirements. MMBT2222ALT1G and MMBT2222A_R1_00001 are available in SOT-23-3 packages with higher inventory levels. MMBT2222ATT1G is available in SC-75 (SOT-416) package. MMBT2222AT-7-F is available in SOT-523 package. PMST2222A,115 is available in SOT-323 package with automotive qualification (AEC-Q101).

Secondary Substitute (Reduced Specifications):

MMBT2222LT1G is an active onsemi product with identical collector current and current gain specifications but reduced collector-emitter breakdown voltage (30 V versus 40 V) and reduced transition frequency (250 MHz versus 300 MHz). This part is suitable for applications where the 40 V rating is not required and lower frequency operation is acceptable.

Limited Compatibility (Functional Substitute Only):

BC846BMB,315 manufactured by Nexperia USA Inc. is not recommended as a direct substitute. This device has significantly reduced collector current (100 mA versus 600 mA), lower transition frequency (100 MHz versus 300 MHz), and different saturation characteristics. Use of this part requires circuit redesign and is limited to low-current applications only.

Frequently Asked Questions (FAQ)

Q: Can MMBT2222ALT1G directly replace MMBT2222AT in existing designs?

A: MMBT2222ALT1G is electrically equivalent to MMBT2222AT with identical collector current (600 mA), breakdown voltage (40 V), and transition frequency (300 MHz). The primary difference is package form factor: MMBT2222ALT1G uses SOT-23-3 (TO-236) while MMBT2222AT uses SC-89-3. PCB layout modifications are required to accommodate the different package footprint.

Q: What is the difference between MMBT2222ATT1G and MMBT2222ALT1G?

A: Both parts are onsemi products with identical electrical specifications (600 mA, 40 V, 300 MHz). The difference is package configuration: MMBT2222ATT1G uses SC-75 (SOT-416) package, while MMBT2222ALT1G uses SOT-23-3 (TO-236) package. MMBT2222ATT1G has lower maximum power dissipation (150 mW versus 225 mW) due to package thermal characteristics.

Q: Is MMBT2222LT1G suitable as a substitute for MMBT2222AT?

A: MMBT2222LT1G is suitable only for applications where the reduced collector-emitter breakdown voltage (30 V versus 40 V) and transition frequency (250 MHz versus 300 MHz) are acceptable. The collector current (600 mA) and current gain (hFE 100) are identical. Applications operating at voltages above 30 V or requiring 300 MHz frequency response must use full-specification equivalents.

Q: Why is BC846BMB,315 listed as a substitute if it has different specifications?

A: BC846BMB,315 is listed based on the provided substitute list but is not recommended for direct replacement. This device has significantly reduced collector current (100 mA versus 600 mA) and transition frequency (100 MHz versus 300 MHz). Use of this part requires complete circuit redesign and is limited to low-current, low-frequency applications.

Q: What are the package options available for MMBT2222 equivalents?

A: Active MMBT2222 equivalents are available in the following surface mount packages: SOT-23-3 (TO-236) [MMBT2222ALT1G, MMBT2222A_R1_00001], SC-75 (SOT-416) [MMBT2222ATT1G], SOT-523 [MMBT2222AT-7-F], and SOT-323 [PMST2222A,115]. Package selection depends on PCB layout constraints and thermal requirements.

Q: Are all substitute parts RoHS3 compliant?

A: All listed substitute parts are RoHS3 compliant with MSL rating of 1 (Unlimited), matching the compliance profile of the original MMBT2222AT.

Q: Which substitute offers automotive qualification?

A: MMBT2222ALT1G and PMST2222A,115 are qualified to AEC-Q101 automotive standards. MMBT2222AT-7-F is also AEC-Q101 qualified. These parts are suitable for automotive and high-reliability applications.

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