FJX2907ATF Equivalent & Substitute Parts

Part Overview

The FJX2907ATF is a PNP bipolar junction transistor manufactured by onsemi, rated for 60 V collector-emitter breakdown voltage and 600 mA maximum collector current. This device is packaged in SOT-323 (SC-70) surface mount configuration and operates at 200 MHz transition frequency with 325 mW maximum power dissipation. The FJX2907ATF is classified as obsolete product status. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for production and repair applications.

Key Parameters

Parameter	FJX2907ATF	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)	325	mW
Transition Frequency	200	MHz
Package Type	SOT-323 (SC-70)	—
Mounting Type	Surface Mount	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the FJX2907ATF is determined by strict electrical and mechanical parameter matching within the PNP bipolar transistor category. The critical parameters that define substitutability are:

Primary Matching Criteria:

Transistor Type: PNP configuration
Collector Current Rating: 600 mA maximum
Collector-Emitter Breakdown Voltage: 60 V minimum
Vce Saturation characteristics: 1.6 V @ 50mA, 500mA
DC Current Gain (hFE): 100 minimum @ 150mA, 10V
Transition Frequency: 200 MHz
Package: SOT-323 (SC-70) surface mount

Direct Equivalents maintain all electrical specifications and package requirements. These parts are manufactured by different suppliers but provide identical electrical performance and physical compatibility.

Similar Parts have relaxed current or voltage ratings but maintain the same package type and basic PNP configuration. These parts are suitable for applications where the FJX2907ATF specifications exceed circuit requirements.

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vce(br) V	Vce Sat V	hFE (Min)	Freq MHz	Power mW	Package	Status
FJX2907ATF	onsemi	600	60	1.6 @ 50mA, 500mA	100 @ 150mA, 10V	200	325	SOT-323	Obsolete
MMBT2907AWT1G	onsemi	600	60	1.6 @ 50mA, 500mA	100 @ 150mA, 10V	200	150	SC-70-3 (SOT323)	Active
MMST2907A-7-F	Diodes Incorporated	600	60	1.6 @ 50mA, 500mA	100 @ 150mA, 10V	200	200	SOT-323	Active
MMST2907A-TP	Micro Commercial Co	600	60	600mV @ 50mA, 500mA	100 @ 150mA, 10V	200	200	SOT-323	Active
PMST2907A,115	Nexperia USA Inc.	600	60	1.6 @ 50mA, 500mA	100 @ 150mA, 10V	200	200	SOT-323	Active
UMT2907AT106	Rohm Semiconductor	600	60	1.6 @ 50mA, 500mA	100 @ 150mA, 10V	200	200	UMT3 (SC-70, SOT-323)	Active
BC856BWT1G	onsemi	100	65	650mV @ 5mA, 100mA	220 @ 2mA, 5V	100	150	SC-70-3 (SOT323)	Active
SBC856BWT1G	onsemi	100	65	650mV @ 5mA, 100mA	220 @ 2mA, 5V	100	150	SC-70-3 (SOT323)	Active
BC856AW,115	Nexperia USA Inc.	100	65	600mV @ 5mA, 100mA	125 @ 2mA, 5V	100	200	SOT-323	Active
BC856AW,135	Nexperia USA Inc.	100	65	600mV @ 5mA, 100mA	125 @ 2mA, 5V	100	200	SOT-323	Active
BC856AW-7-F	Diodes Incorporated	100	65	650mV @ 5mA, 100mA	125 @ 2mA, 5V	200	200	SOT-323	Active

Engineering Selection Recommendations

Direct Equivalents (Recommended Primary Substitutes):

The following parts provide complete electrical and mechanical compatibility with the FJX2907ATF and are classified as active products:

MMBT2907AWT1G (onsemi): Active status, RoHS3 compliant, identical electrical specifications, SC-70-3 package variant
MMST2907A-7-F (Diodes Incorporated): Active status, RoHS3 compliant, identical electrical specifications
MMST2907A-TP (Micro Commercial Co): Active status, RoHS3 compliant, identical electrical specifications with 600mV Vce saturation
PMST2907A,115 (Nexperia USA Inc.): Active status, RoHS3 compliant, AEC-Q101 automotive qualified, identical electrical specifications
UMT2907AT106 (Rohm Semiconductor): Active status, RoHS3 compliant, identical electrical specifications, UMT3 package variant

All direct equivalents maintain 600 mA collector current, 60 V breakdown voltage, 200 MHz transition frequency, and 100 minimum hFE at specified conditions.

Similar Parts (Lower Current/Voltage Applications):

The BC856 series parts (BC856BWT1G, SBC856BWT1G, BC856AW,115, BC856AW,135, BC856AW-7-F) are suitable for applications requiring reduced collector current (100 mA maximum) and higher breakdown voltage (65 V). These parts are active products with RoHS3 compliance. SBC856BWT1G and BC856AW,115 carry AEC-Q101 automotive qualification. BC856AW-7-F provides 200 MHz transition frequency matching the FJX2907ATF.

Selection between direct equivalents should be based on packaging preference (SOT-323 versus SC-70-3 variants), supplier availability, and automotive qualification requirements where applicable.

Frequently Asked Questions (FAQ)

Q: Can MMBT2907AWT1G directly replace FJX2907ATF in all applications?

A: MMBT2907AWT1G provides identical electrical specifications and is packaged in SC-70-3, a variant of SOT-323. Both packages are mechanically and electrically compatible. The primary difference is power dissipation rating (150 mW versus 325 mW). Verify that circuit power requirements do not exceed 150 mW continuous dissipation.

Q: What is the difference between MMST2907A-7-F and MMST2907A-TP?

A: Both parts maintain 600 mA collector current and 60 V breakdown voltage. MMST2907A-7-F is manufactured by Diodes Incorporated with 1.6 V Vce saturation. MMST2907A-TP is manufactured by Micro Commercial Co with 600 mV Vce saturation. Both are active products with 200 mW power dissipation and 200 MHz transition frequency.

Q: Are BC856 series parts suitable replacements for FJX2907ATF?

A: BC856 series parts are similar but not direct equivalents. They are rated for 100 mA maximum collector current versus 600 mA for FJX2907ATF. These parts are suitable only for applications where circuit current requirements do not exceed 100 mA. BC856 parts provide higher breakdown voltage (65 V) and are available with automotive qualification.

Q: What does AEC-Q101 qualification mean for automotive applications?

A: AEC-Q101 is an automotive electronics qualification standard. PMST2907A,115 and BC856AW,115 carry this qualification, indicating suitability for automotive-grade applications. Non-qualified parts may not meet automotive reliability and testing requirements.

Q: Can I use UMT2907AT106 in place of FJX2907ATF?

A: UMT2907AT106 provides identical electrical specifications and is packaged in UMT3, which is mechanically compatible with SOT-323. Both are surface mount packages with the same pin configuration. UMT2907AT106 is an active product with RoHS3 compliance.

Q: Why does MMBT2907AWT1G have lower power dissipation (150 mW) than FJX2907ATF (325 mW)?

A: Power dissipation rating reflects the thermal design of the specific package variant. SC-70-3 and SOT-323 variants have different thermal characteristics. Verify that your circuit design does not require continuous power dissipation exceeding 150 mW for MMBT2907AWT1G.

Q: Are all substitute parts RoHS3 compliant?

A: All active substitute parts listed are RoHS3 compliant. The obsolete FJX2907ATF does not carry RoHS3 compliance status. RoHS3 compliance is required for new designs and applications subject to environmental regulations.

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

A: Cut Tape packaging is supplied in individual strips suitable for small-quantity applications. Tape & Reel packaging is supplied on continuous reels for high-volume automated assembly. Both formats contain identical components; packaging format selection depends on production volume and assembly equipment.

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