MMBT2222A_D87Z Equivalent & Substitute Parts

Part Overview

The MMBT2222A_D87Z 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, 1 A maximum collector current, and 300 MHz transition frequency in a surface-mount SOT-23-3 package. The part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain functional compatibility within specified electrical and mechanical parameters.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	40	V
Current - Collector (Ic) (Max)	1	A
Power - Max	350	mW
Frequency - Transition	300	MHz
Package / Case	SOT-23-3	—
Mounting Type	Surface Mount	—
Operating Temperature (Max)	150	°C

Substitute Part Grouping Explanation

Substitution of the MMBT2222A_D87Z is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Transistor Type: NPN (all substitutes must be NPN)
Package / Case: SOT-23-3 (all substitutes must use identical surface-mount package)
Mounting Type: Surface Mount (all substitutes must be surface-mount)
Voltage - Collector Emitter Breakdown (Max): Must equal or exceed 40 V
Current - Collector (Ic) (Max): Must equal or exceed 1 A
Power - Max: Must equal or exceed 350 mW
Frequency - Transition: Must equal or exceed 300 MHz

Substitute parts are grouped into two categories based on these criteria:

Category A - Full Parameter Equivalents: Parts that meet or exceed all mandatory criteria while maintaining active product status and modern compliance certifications (RoHS3, AEC-Q101 where applicable).

Category B - Reduced Performance Substitutes: Parts that maintain NPN type and SOT-23-3 package but operate within reduced electrical specifications. These are suitable only when application requirements permit lower voltage, current, or frequency ratings.

Parameter Comparison

Part Number	Manufacturer	Product Status	Ic (Max) [A]	Vce Breakdown (Max) [V]	Power (Max) [mW]	Frequency [MHz]	Package	RoHS Status
MMBT2222A_D87Z	onsemi	Obsolete	1.0	40	350	300	SOT-23-3	—
MMBT2222ALT1G	onsemi	Active	0.6	40	225	300	SOT-23-3	ROHS3 Compliant
MMBT2222ALT3G	onsemi	Active	0.6	40	300	300	SOT-23-3	ROHS3 Compliant
MMBT2222LT1G	onsemi	Active	0.6	30	300	250	SOT-23-3	ROHS3 Compliant
MMBT489LT1G	onsemi	Active	1.0	30	710	100	SOT-23-3	ROHS3 Compliant
MMBT6429LT1G	onsemi	Active	0.2	45	225	700	SOT-23-3	ROHS3 Compliant
NSS30101LT1G	onsemi	Active	1.0	30	310	100	SOT-23-3	ROHS3 Compliant
SMMBT2222ALT1G	onsemi	Active	0.6	40	225	300	SOT-23-3	ROHS3 Compliant
SMMBT4401LT1G	onsemi	Active	0.6	40	300	250	SOT-23-3	ROHS3 Compliant
BCW65ALT1G	onsemi	Active	0.8	32	225	100	SOT-23-3	ROHS3 Compliant
BCW65CLT1G	onsemi	Active	0.8	32	225	100	SOT-23-3	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

MMBT2222ALT1G and MMBT2222ALT3G maintain the 40 V collector-emitter breakdown voltage and 300 MHz transition frequency of the original part. Both are active products with RoHS3 compliance. MMBT2222ALT3G provides 300 mW power dissipation, closer to the original 350 mW specification. SMMBT2222ALT1G offers identical electrical specifications with automotive-grade qualification (AEC-Q101), suitable for applications requiring automotive compliance.

Secondary Substitutes (Reduced Current Rating):

MMBT2222LT1G and SMMBT4401LT1G operate at 40 V breakdown voltage with 600 mA maximum collector current. These parts are suitable for applications where the 1 A current requirement can be reduced. Both maintain active product status and RoHS3 compliance.

Alternative Substitutes (Reduced Voltage Rating):

MMBT489LT1G and NSS30101LT1G provide 1 A collector current but operate at 30 V maximum breakdown voltage. These parts are suitable only for applications where the 40 V voltage specification can be reduced. Both are active products with RoHS3 compliance and higher power dissipation capability (710 mW and 310 mW respectively).

Limited Compatibility Substitutes:

MMBT6429LT1G, BCW65ALT1G, and BCW65CLT1G do not meet the mandatory current or voltage specifications of the original part and are suitable only for applications with significantly reduced electrical requirements.

All substitute parts listed maintain SOT-23-3 surface-mount packaging and NPN transistor type. Selection should be based on specific application requirements for collector current, breakdown voltage, and frequency response.

Frequently Asked Questions (FAQ)

Q: Can MMBT2222ALT1G directly replace MMBT2222A_D87Z?

A: MMBT2222ALT1G maintains the same 40 V breakdown voltage and 300 MHz transition frequency. However, the maximum collector current is reduced from 1 A to 600 mA, and power dissipation is reduced from 350 mW to 225 mW. Direct replacement is possible only if the application does not require the full 1 A current specification.

Q: What is the difference between MMBT2222ALT1G and MMBT2222ALT3G?

A: Both parts share identical electrical specifications (40 V, 600 mA, 300 MHz). The primary difference is power dissipation: MMBT2222ALT3G is rated for 300 mW compared to 225 mW for MMBT2222ALT1G. MMBT2222ALT3G provides better thermal margin in power-limited applications.

Q: Why does SMMBT2222ALT1G have an "S" prefix?

A: The "S" prefix indicates automotive-grade qualification (AEC-Q101). SMMBT2222ALT1G is suitable for automotive applications requiring enhanced reliability and qualification documentation. Electrical specifications are identical to MMBT2222ALT1G.

Q: Can MMBT489LT1G replace MMBT2222A_D87Z?

A: MMBT489LT1G maintains the 1 A collector current specification but operates at a reduced 30 V breakdown voltage (compared to 40 V). Substitution is possible only if the application operates below 30 V. The 100 MHz transition frequency is also reduced from 300 MHz.

Q: Are all substitute parts RoHS3 compliant?

A: All substitute parts listed are RoHS3 compliant. The original MMBT2222A_D87Z does not specify RoHS status. Modern designs should utilize RoHS3-compliant substitutes to meet current regulatory requirements.

Q: What is the package compatibility for all listed substitutes?

A: All substitute parts use the SOT-23-3 (TO-236-3, SC-59) surface-mount package, identical to the original MMBT2222A_D87Z. PCB footprints and reflow soldering processes are directly compatible.

Q: Which substitute offers the best thermal performance?

A: MMBT489LT1G provides the highest power dissipation rating at 710 mW, followed by MMBT2222ALT3G at 300 mW. Selection should be based on application thermal requirements and operating conditions.

Q: Can BCW65 series parts replace MMBT2222A_D87Z?

A: BCW65ALT1G and BCW65CLT1G do not meet the mandatory specifications. Both are limited to 32 V breakdown voltage and 800 mA collector current, with only 100 MHz transition frequency. These parts are suitable only for applications with significantly reduced electrical requirements.

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