FMMT2222ATA Equivalent & Substitute Parts

Part Overview

The FMMT2222ATA is an NPN bipolar junction transistor manufactured by Diodes Incorporated, 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 SOT-23-3 package. The part is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and ongoing production requirements.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Collector-Emitter Breakdown Voltage (Max)	40	V
Collector Current (Max)	600	mA
Transition Frequency	300	MHz
Power Dissipation (Max)	330	mW
DC Current Gain (hFE Min)	100	@ 150mA, 10V
Vce Saturation (Max)	1	V @ 50mA, 500mA
Operating Temperature Range	-55 to 150	°C
Package Type	SOT-23-3	—
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitution of the FMMT2222ATA is determined by electrical and mechanical compatibility across the following critical parameters:

Primary Substitution Criteria:

Transistor type (NPN)
Collector-emitter breakdown voltage (40 V minimum)
Collector current rating (600 mA minimum)
Transition frequency (300 MHz minimum)
Power dissipation capability (330 mW minimum)
DC current gain (hFE ≥ 100 at specified conditions)
Vce saturation characteristics (1 V @ 50mA, 500mA)
Package compatibility (SOT-23-3 or equivalent surface mount)

Secondary Compatibility Factors:

Operating temperature range (-55°C to 150°C preferred)
RoHS compliance status
Moisture sensitivity level (MSL 1)

Substitute parts are grouped into three categories: direct manufacturer equivalents (matching all primary parameters), active production alternatives (meeting electrical specifications with current availability), and last-time-buy options (meeting specifications but with limited future availability).

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vce(br) V	fT MHz	P(max) mW	hFE (Min)	Package	Status	RoHS
FMMT2222ATA	Diodes Inc.	600	40	300	330	100	SOT-23-3	Obsolete	Non-compliant
MMBT2222A-7-F	Diodes Inc.	600	40	300	310	100	SOT-23-3	Active	ROHS3
CMPT2222A TR PBFREE	Central Semiconductor	600	40	300	350	100	SOT-23-3	Active	ROHS3
MMBT2222A-G	Comchip Technology	600	40	300	300	100	SOT-23-3	Active	ROHS3
MMBT2222ALT1HTSA1	Infineon Technologies	600	40	300	330	100	SOT-23-3	Last Time Buy	ROHS3
SMBT2222AE6327HTSA1	Infineon Technologies	600	40	300	330	100	SOT-23-3	Last Time Buy	ROHS3
BC817-16,215	Nexperia USA Inc.	500	45	100	250	100	TO-236AB	Active	ROHS3
BC817-16,235	Nexperia USA Inc.	500	45	100	250	100	TO-236AB	Active	ROHS3
BC817-16LT1G	onsemi	500	45	100	300	100	SOT-23-3	Active	ROHS3
BC817-16LT3G	onsemi	500	500	100	300	100	SOT-23-3	Active	ROHS3
BC817-25,215	NXP USA Inc.	500	45	100	250	160	SOT-23-3	Active	ROHS3

Engineering Selection Recommendations

Direct Equivalent (Recommended Primary Choice):

MMBT2222A-7-F from Diodes Incorporated is the primary recommended substitute. This part maintains identical electrical specifications to the FMMT2222ATA across all critical parameters: 600 mA collector current, 40 V breakdown voltage, 300 MHz transition frequency, and 100 minimum hFE. The device is in active production status with ROHS3 compliance, ensuring long-term availability and regulatory alignment. Packaging is identical SOT-23-3 surface mount, enabling direct board-level substitution without design modification.

Alternative Direct Equivalents (Active Production):

CMPT2222A TR PBFREE (Central Semiconductor) and MMBT2222A-G (Comchip Technology) provide functionally equivalent alternatives with identical electrical performance. Both devices are in active production with ROHS3 compliance. CMPT2222A offers extended operating temperature range (-65°C to 150°C) compared to the original specification. Both support immediate procurement without design changes.

Last-Time-Buy Options (Limited Availability):

MMBT2222ALT1HTSA1 and SMBT2222AE6327HTSA1 from Infineon Technologies meet all electrical requirements but carry last-time-buy status, indicating discontinued production with finite inventory. These options are suitable only for applications requiring immediate component availability where long-term supply is not critical.

Reduced-Performance Alternatives (Conditional Use):

BC817 series devices (Nexperia and onsemi variants) provide functional substitution with reduced electrical performance. These parts feature 500 mA maximum collector current (versus 600 mA), 100 MHz transition frequency (versus 300 MHz), and 45 V breakdown voltage (versus 40 V). BC817 devices are suitable only for applications where the reduced current and frequency specifications do not impact circuit performance. All BC817 variants are in active production with ROHS3 compliance. onsemi BC817-16LT1G and BC817-16LT3G maintain SOT-23-3 packaging; Nexperia variants use TO-236AB packaging.

Frequently Asked Questions (FAQ)

Q: Can MMBT2222A-7-F directly replace FMMT2222ATA without circuit modification?

A: Yes. MMBT2222A-7-F maintains identical electrical specifications across all critical parameters: 600 mA collector current, 40 V breakdown voltage, 300 MHz transition frequency, and 100 minimum hFE. Both devices use SOT-23-3 surface mount packaging. Direct board-level substitution is supported without design changes.

Q: What is the difference between MMBT2222A-7-F and CMPT2222A TR PBFREE?

A: Both devices meet identical electrical specifications for the FMMT2222ATA replacement. Primary differences are manufacturer (Diodes vs. Central Semiconductor) and operating temperature range. CMPT2222A supports -65°C to 150°C versus MMBT2222A-7-F at -55°C to 150°C. Both are ROHS3 compliant and in active production.

Q: Why are BC817 devices listed as substitutes if they have lower current and frequency ratings?

A: BC817 devices meet the fundamental NPN transistor type requirement and maintain compatible package form factors (SOT-23-3 or TO-236AB). However, reduced collector current (500 mA vs. 600 mA) and transition frequency (100 MHz vs. 300 MHz) limit their use to applications where these lower specifications do not compromise circuit performance. BC817 substitution requires circuit-level evaluation.

Q: What is the significance of "Last Time Buy" status for Infineon parts?

A: Last-time-buy status indicates the manufacturer has discontinued production with a defined final order date. Existing inventory is finite. These parts meet all electrical requirements but should be selected only when immediate availability is critical and long-term supply assurance is not required. For new designs, active production alternatives are preferred.

Q: Are all substitute parts ROHS3 compliant?

A: All listed substitute parts carry ROHS3 compliance status. The original FMMT2222ATA is RoHS non-compliant. Substitution with any listed alternative provides regulatory compliance upgrade for new production and design updates.

Q: Can BC817-25,215 replace FMMT2222ATA in high-frequency applications?

A: No. BC817-25,215 features 100 MHz transition frequency compared to FMMT2222ATA's 300 MHz specification. This three-fold frequency reduction makes BC817-25,215 unsuitable for applications requiring 300 MHz performance. Use MMBT2222A-7-F or equivalent 2222A variants for frequency-critical circuits.

Q: What packaging differences exist among substitute options?

A: Most substitutes use SOT-23-3 packaging, identical to the original FMMT2222ATA. Nexperia BC817-16,215 and BC817-16,235 use TO-236AB packaging, which is mechanically compatible but may require PCB footprint verification. onsemi BC817 variants maintain SOT-23-3 packaging. Verify PCB design compatibility before selection.

Q: Is moisture sensitivity level (MSL) consistent across all substitutes?

A: Yes. All listed substitute parts carry MSL 1 (Unlimited) rating, matching the original FMMT2222ATA specification. No special moisture handling or baking procedures are required for any substitute option.

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