MMST2222AT146 Equivalent & Substitute Parts

Part Overview

The MMST2222AT146 is an NPN bipolar junction transistor manufactured by Rohm Semiconductor, 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 in active production status with 15,400 units in stock.

Equivalent and substitute parts are necessary when the primary part becomes unavailable, when alternative packaging formats are required for manufacturing processes, or when design specifications allow for compatible alternatives from different manufacturers. This reference provides direct equivalents and parametric substitutes that maintain electrical and mechanical compatibility with the MMST2222AT146.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Collector-Emitter Breakdown Voltage (Max)	40	V
Collector Current (Max)	600	mA
Power Dissipation (Max)	200	mW
Transition Frequency	300	MHz
DC Current Gain (hFE Min)	100	@ 150mA, 10V
Vce Saturation (Max)	1	V @ 50mA, 500mA
Operating Temperature (Max)	150	°C
Package Type	SOT-23-3 (TO-236-3, SC-59)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the MMST2222AT146 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Parameters for Substitution:

Transistor Type: NPN
Collector-Emitter Breakdown Voltage: 40 V (minimum requirement)
Collector Current: 600 mA (minimum requirement)
Transition Frequency: 300 MHz (minimum requirement)
DC Current Gain (hFE): 100 minimum at specified conditions
Vce Saturation: 1 V maximum at specified bias conditions
Package/Case: TO-236-3, SC-59, or SOT-23-3 (mechanically compatible)
Mounting Type: Surface Mount
RoHS Compliance: ROHS3 Compliant

Substitution Categories:

Direct Equivalents maintain all electrical parameters and differ only in manufacturer, packaging format (Cut Tape vs. Tape & Reel), or minor supplier device package designations. These parts are pin-compatible and functionally identical.

Parametric Equivalents meet or exceed all critical electrical specifications but may have different power dissipation ratings, operating temperature ranges, or automotive qualifications. These parts are electrically compatible and mechanically interchangeable.

Similar Alternatives meet the core electrical requirements but may have higher power ratings or different product status designations. These parts are suitable for applications where the MMST2222AT146 specifications are met or exceeded.

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vce(br) V	Power mW	hFE (Min)	Freq MHz	Package	Status	Inventory
MMST2222AT146	Rohm Semiconductor	600	40	200	100	300	SMT3	Active	15,400
SST2222AT116	Rohm Semiconductor	600	40	350	100	300	SST3	Not For New Designs	113,400
SST2222AHZGT116	Rohm Semiconductor	600	40	200	100	300	SST3	Active	3,778
CMPT2222A TR PBFREE	Central Semiconductor Corp	600	40	350	100	300	SOT-23	Active	8,084
MMBT2222A,215	Nexperia USA Inc.	600	40	250	100	300	TO-236AB	Active	469,986
MMBT2222A-7-F	Diodes Incorporated	600	40	310	100	300	SOT-23-3	Active	1,004,100
MMBT2222A-TP	Micro Commercial Co	600	40	350	100	300	SOT-23	Active	4,300
MMBT2222ALT3G	onsemi	600	40	300	100	300	SOT-23-3 (TO-236)	Active	6,801
PMBT2222A,215	Nexperia USA Inc.	600	30	250	100	300	TO-236AB	Active	4,200
PMBT2222A,235	Nexperia USA Inc.	600	40	250	100	300	TO-236AB	Active	62,621
SMBT2222AE6327HTSA1	Infineon Technologies	600	40	330	100	300	PG-SOT23	Last Time Buy	3,400

Engineering Selection Recommendations

Tier 1 Direct Equivalents (Recommended Primary Substitutes):

MMBT2222A-7-F (Diodes Incorporated) and MMBT2222ALT3G (onsemi) are the preferred direct equivalents. Both parts maintain identical electrical specifications to the MMST2222AT146, are in active production status, and have substantial inventory availability. MMBT2222A-7-F offers the highest inventory level (1,004,100 units) and extended operating temperature range (-55°C to 150°C). MMBT2222ALT3G provides equivalent performance with active status confirmation.

PMBT2222A,235 (Nexperia USA Inc.) is a direct electrical equivalent with 40 V breakdown voltage, 600 mA collector current, and 300 MHz transition frequency. This part carries AEC-Q101 automotive qualification and is suitable for applications requiring automotive-grade components. Inventory availability is substantial at 62,621 units.

Tier 2 Parametric Equivalents (Suitable Alternatives):

SST2222AHZGT116 (Rohm Semiconductor) is a parametric equivalent from the original manufacturer with identical electrical specifications and active production status. This part includes AEC-Q101 automotive qualification and is suitable for automotive applications. The 200 mW power rating matches the MMST2222AT146 exactly.

CMPT2222A TR PBFREE (Central Semiconductor Corp) meets all electrical requirements with 350 mW power dissipation and extended operating temperature range (-65°C to 150°C). This part is in active production with 8,084 units available.

Tier 3 Similar Alternatives (Limited Recommendation):

SST2222AT116 (Rohm Semiconductor) meets all electrical specifications but carries "Not For New Designs" status. This part should be avoided for new designs despite high inventory availability (113,400 units).

SMBT2222AE6327HTSA1 (Infineon Technologies) meets electrical specifications but is designated "Last Time Buy," indicating end-of-life status. This part should be used only when existing inventory must be consumed.

PMBT2222A,215 (Nexperia USA Inc.) has reduced breakdown voltage (30 V versus 40 V required). This part is suitable only for applications where 30 V breakdown voltage is acceptable.

Frequently Asked Questions (FAQ)

Q: Can MMBT2222A-7-F directly replace MMST2222AT146 in existing designs?

A: Yes. MMBT2222A-7-F is a direct electrical equivalent with identical collector current (600 mA), breakdown voltage (40 V), transition frequency (300 MHz), and DC current gain specifications. Both parts use SOT-23-3 packaging and are mechanically interchangeable. The primary difference is the manufacturer (Diodes Incorporated versus Rohm Semiconductor) and extended operating temperature range on the MMBT2222A-7-F (-55°C to 150°C versus 0°C to 150°C on the MMST2222AT146).

Q: What is the difference between SMT3, SST3, and SOT-23-3 package designations?

A: SMT3, SST3, and SOT-23-3 are supplier-specific package designations for the same physical package: TO-236-3 (also known as SC-59). All three designations refer to a three-pin surface mount package with identical pin configuration and mechanical dimensions. The different names reflect different manufacturer or supplier conventions. Parts using any of these designations are mechanically and electrically interchangeable.

Q: Is PMBT2222A,235 suitable as a substitute for MMST2222AT146?

A: Yes, with full compatibility. PMBT2222A,235 maintains the 40 V breakdown voltage, 600 mA collector current, 300 MHz transition frequency, and 100 minimum DC current gain. This part includes AEC-Q101 automotive qualification, making it suitable for automotive applications. The 250 mW power rating exceeds the 200 mW requirement of the MMST2222AT146.

Q: Why should SST2222AT116 be avoided despite high inventory?

A: SST2222AT116 carries "Not For New Designs" product status, indicating that the manufacturer has discontinued this part for new applications. While the part meets electrical specifications, using obsolete or end-of-life components in new designs creates long-term supply chain risk and may complicate future production runs. Active status alternatives with equivalent specifications are available.

Q: Can PMBT2222A,215 be used in place of MMST2222AT146?

A: PMBT2222A,215 has a reduced breakdown voltage specification of 30 V compared to the 40 V requirement of MMST2222AT146. This part is suitable only for applications where the circuit operates below 30 V collector-emitter voltage. For circuits designed to the full 40 V specification, PMBT2222A,215 does not provide adequate voltage margin and should not be used.

Q: What is the significance of AEC-Q101 qualification on substitute parts?

A: AEC-Q101 is an automotive industry qualification standard that certifies components for automotive applications. Parts carrying this qualification (such as SST2222AHZGT116 and PMBT2222A,235) have undergone additional reliability testing and are approved for use in automotive circuits. If the original application requires automotive-grade components, substitutes must also carry AEC-Q101 qualification.

Q: Are there inventory considerations when selecting a substitute?

A: Yes. Inventory levels vary significantly among equivalent parts. MMBT2222A-7-F offers the highest availability (1,004,100 units), followed by MMBT2222A,215 (469,986 units) and PMBT2222A,235 (62,621 units). For high-volume production or long-term supply assurance, parts with higher inventory levels provide greater availability. However, inventory levels are subject to change and should be verified at the time of procurement.

Q: What is the difference between Cut Tape (CT) and Tape & Reel (TR) packaging formats?

A: Cut Tape packaging provides individual components cut from a continuous tape, suitable for small-quantity orders and manual assembly. Tape & Reel packaging provides components on continuous tape wound on reels, optimized for automated pick-and-place assembly equipment. Both formats contain identical components; the difference is in the delivery and handling format. Selection depends on manufacturing process requirements and order quantities.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message