FMMT2907ATA Equivalent & Substitute Parts

Part Overview

The FMMT2907ATA is a PNP bipolar junction transistor manufactured by Diodes Incorporated, rated for 60 V collector-emitter breakdown voltage and 600 mA maximum collector current. This device is packaged in SOT-23-3 surface mount configuration and operates across a temperature range of -55°C to 150°C. The part is classified as obsolete, necessitating identification of equivalent and substitute components for ongoing design requirements and production continuity.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Collector Current (Max)	600	mA
Collector-Emitter Breakdown Voltage (Max)	60	V
Vce Saturation (Max)	1.6	V @ 50mA, 500mA
DC Current Gain (hFE Min)	100	@ 150mA, 10V
Power Dissipation (Max)	330	mW
Transition Frequency	200	MHz
Operating Temperature Range	-55 to 150	°C
Package Type	SOT-23-3	—

Substitute Part Grouping Explanation

Substitution of the FMMT2907ATA is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

Transistor type must be PNP
Collector current rating must be ≥600 mA
Collector-emitter breakdown voltage must be ≥60 V
DC current gain (hFE) must be ≥100 at specified test conditions
Transition frequency must be ≥200 MHz
Vce saturation characteristics must be compatible with application requirements

Mechanical Compatibility Criteria:

Surface mount package type (SOT-23-3, SOT-323, or equivalent footprint)
Operating temperature range must encompass -55°C to 150°C or be suitable for the intended application

Compliance Criteria:

RoHS compliance status
Moisture sensitivity level (MSL 1 preferred)
Product status (active preferred for new designs; not for new designs acceptable for legacy support)

Substitute parts are grouped into three categories: direct equivalents (matching all electrical and package specifications), alternative packages (same electrical performance in different surface mount packages), and performance-equivalent alternatives (meeting or exceeding electrical requirements with different manufacturers).

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vce(br) V	hFE (Min)	fT MHz	Power mW	Package	Product Status	RoHS
FMMT2907ATA	Diodes Inc.	600	60	100	200	330	SOT-23-3	Obsolete	Non-compliant
MMBT2907A-7-F	Diodes Inc.	600	60	100	200	300	SOT-23-3	Active	ROHS3
MMST2907A-7-F	Diodes Inc.	600	60	100	200	200	SOT-323	Active	ROHS3
CMPT2907A TR PBFREE	Central Semiconductor	600	60	100	200	350	SOT-23-3	Active	ROHS3
MMBT2907A RFG	Taiwan Semiconductor	600	60	100	200	350	SOT-23-3	Active	ROHS3
SST2907AT116	Rohm Semiconductor	600	60	100	200	350	SOT-23-3	Not For New Designs	ROHS3
CMPT2907AE TR PBFREE	Central Semiconductor	600	60	100	200	350	SOT-23-3	Active	ROHS3
BC856,215	Nexperia USA Inc.	100	65	125	100	250	TO-236AB	Active	ROHS3
BC856A,215	Nexperia USA Inc.	100	65	125	100	250	TO-236AB	Active	ROHS3
BC856ALT1G	onsemi	100	65	125	100	300	SOT-23-3	Active	ROHS3
BC856B,215	Nexperia USA Inc.	100	65	220	100	250	TO-236AB	Active	ROHS3

Engineering Selection Recommendations

Primary Substitutes (Direct Electrical and Package Equivalents):

MMBT2907A-7-F (Diodes Incorporated) is the recommended primary substitute. This part maintains identical electrical specifications to the FMMT2907ATA across all critical parameters: 600 mA collector current, 60 V breakdown voltage, 100 mA minimum hFE, and 200 MHz transition frequency. The device is in active product status with ROHS3 compliance, ensuring long-term availability and regulatory conformance. Power dissipation is reduced to 300 mW, which is acceptable for applications designed for the 330 mW rating.

CMPT2907A TR PBFREE (Central Semiconductor Corp) and CMPT2907AE TR PBFREE (Central Semiconductor Corp) provide equivalent electrical performance with increased power dissipation ratings (350 mW). Both are active products with ROHS3 compliance. The CMPT2907AE variant features improved Vce saturation characteristics (700 mV versus 1.6 V) and extended operating temperature range (-65°C to 150°C), offering enhanced performance margins.

MMBT2907A RFG (Taiwan Semiconductor Corporation) meets all electrical requirements with 350 mW power rating and active product status. This option provides geographic supply diversification.

Alternative Package Substitute:

MMST2907A-7-F (Diodes Incorporated) provides identical electrical performance in SOT-323 package format. This smaller footprint option is suitable for space-constrained applications. The 200 mW power rating is lower than the original specification but remains within acceptable limits for many applications. Active product status and ROHS3 compliance ensure availability.

Legacy Support Option:

SST2907AT116 (Rohm Semiconductor) maintains full electrical compatibility but carries "Not For New Designs" status. This part is suitable only for legacy system maintenance and repair where supply continuity is required.

Limited Current Substitutes (Not Recommended for Direct Replacement):

BC856 series devices (Nexperia USA Inc., onsemi) are not suitable as direct replacements. These parts feature significantly reduced collector current ratings (100 mA maximum versus 600 mA required) and lower transition frequency (100 MHz versus 200 MHz). These devices are appropriate only for applications with substantially lower current requirements and are included for reference only.

Frequently Asked Questions (FAQ)

Q: Can MMBT2907A-7-F directly replace FMMT2907ATA without circuit modification?

A: Yes. MMBT2907A-7-F maintains identical electrical specifications across all critical parameters: 600 mA collector current, 60 V breakdown voltage, 100 mA minimum hFE at specified conditions, and 200 MHz transition frequency. The SOT-23-3 package is mechanically identical. Power dissipation is reduced from 330 mW to 300 mW, which is acceptable for designs rated to the original specification.

Q: What is the difference between CMPT2907A TR PBFREE and CMPT2907AE TR PBFREE?

A: Both parts meet the electrical requirements of FMMT2907ATA. The CMPT2907AE variant features improved Vce saturation (700 mV at 50 mA, 500 mA versus 1.6 V) and extended operating temperature range (-65°C to 150°C versus -55°C to 150°C). Selection depends on application requirements for saturation voltage performance and temperature extremes.

Q: Why are BC856 series parts listed if they cannot replace FMMT2907ATA?

A: BC856 series devices are included for reference in applications where current requirements are substantially lower (≤100 mA). These parts are not suitable for circuits designed for 600 mA operation. Direct substitution would result in inadequate current handling capability.

Q: Is MMST2907A-7-F suitable for high-current applications?

A: MMST2907A-7-F maintains the required 600 mA collector current rating and all electrical specifications. The SOT-323 package is mechanically smaller than SOT-23-3 but electrically equivalent. Power dissipation is reduced to 200 mW; applications must verify thermal performance in the target circuit.

Q: What is the significance of RoHS compliance status?

A: FMMT2907ATA is RoHS non-compliant. All recommended substitutes (MMBT2907A-7-F, CMPT2907A TR PBFREE, CMPT2907AE TR PBFREE, MMBT2907A RFG, MMST2907A-7-F) are ROHS3 compliant, meeting current regulatory requirements for new designs and production systems.

Q: Can SST2907AT116 be used for new product designs?

A: No. SST2907AT116 carries "Not For New Designs" status. This part is restricted to legacy system maintenance and repair applications only. For new designs, select from active-status alternatives: MMBT2907A-7-F, CMPT2907A TR PBFREE, CMPT2907AE TR PBFREE, or MMBT2907A RFG.

Q: What packaging options are available for FMMT2907ATA substitutes?

A: Primary substitutes are available in SOT-23-3 package (MMBT2907A-7-F, CMPT2907A TR PBFREE, CMPT2907AE TR PBFREE, MMBT2907A RFG). An alternative SOT-323 package option is available (MMST2907A-7-F) for space-constrained applications. All packages are surface mount configurations with identical electrical performance.

Q: How does transition frequency affect substitute selection?

A: FMMT2907ATA specifies 200 MHz transition frequency. All recommended substitutes maintain this specification. BC856 series alternatives operate at 100 MHz and are not suitable for applications requiring 200 MHz performance.

Q: What is the impact of reduced power dissipation in substitute parts?

A: MMBT2907A-7-F reduces power dissipation from 330 mW to 300 mW. This reduction is acceptable for designs rated to the original 330 mW specification, as it provides additional thermal margin. Applications operating near maximum power limits should verify thermal performance. CMPT2907A variants and MMBT2907A RFG offer 350 mW ratings, exceeding the original specification.

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