FJC1963STF Equivalent & Substitute Parts

Part Overview

The FJC1963STF is an NPN bipolar junction transistor manufactured by onsemi, rated for 30V collector-emitter breakdown voltage and 3A maximum collector current in a surface mount SOT-89-3 package. This device is classified as obsolete, necessitating identification of active equivalent components for new designs and ongoing production requirements. Substitute parts must maintain electrical and mechanical compatibility across critical performance parameters including voltage rating, current capacity, power dissipation, and package form factor.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Maximum Collector Current (Ic)	3	A
Collector-Emitter Breakdown Voltage (Max)	30	V
Maximum Power Dissipation	500	mW
Vce Saturation (Max)	450mV @ 150mA, 1.5A	—
DC Current Gain (hFE Min)	280 @ 500mA, 2V	—
Maximum Operating Temperature	150	°C
Package Type	SOT-89-3 (TO-243AA)	—
Mounting Type	Surface Mount	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the FJC1963STF is based on strict equivalence across the following electrical and mechanical parameters:

Electrical Equivalence Criteria:

Transistor type: NPN configuration
Maximum collector current: 3A minimum
Collector-emitter breakdown voltage: 30V minimum
Maximum power dissipation: 500mW minimum
Operating temperature range: 150°C maximum junction temperature

Mechanical Equivalence Criteria:

Package designation: TO-243AA (SOT-89-3 equivalent)
Mounting technology: Surface mount
Moisture sensitivity: MSL 1 or better

The substitute parts identified—2SCR552P5T100 and 2SCR552PFRAT100 from Rohm Semiconductor—satisfy all electrical and mechanical requirements. Both devices are manufactured in the MPT3 package, which is mechanically and electrically equivalent to the SOT-89-3 form factor. Both substitute parts are active products with current manufacturing status, addressing the obsolescence of the original FJC1963STF.

Parameter Comparison

Parameter	FJC1963STF (onsemi)	2SCR552P5T100 (Rohm)	2SCR552PFRAT100 (Rohm)
Transistor Type	NPN	NPN	NPN
Ic (Max)	3 A	3 A	3 A
Vce Breakdown (Max)	30 V	30 V	30 V
Power (Max)	500 mW	500 mW	500 mW
Vce Saturation (Max)	450mV @ 150mA, 1.5A	400mV @ 50mA, 1A	400mV @ 50mA, 1A
DC Current Gain (hFE Min)	280 @ 500mA, 2V	200 @ 500mA, 2V	200 @ 500mA, 2V
Frequency - Transition	Not specified	280 MHz	280 MHz
Operating Temperature (Max)	150°C	150°C	150°C
Package / Case	TO-243AA	TO-243AA	TO-243AA
Mounting Type	Surface Mount	Surface Mount	Surface Mount
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Active	Active
RoHS Compliance	Not specified	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

2SCR552P5T100 (Rohm Semiconductor) is suitable for general-purpose applications requiring direct replacement of the FJC1963STF. This part is active in production with extensive inventory availability (129,792 pcs), ensuring supply continuity. The device meets all electrical specifications and is ROHS3 compliant. Vce saturation is improved (400mV versus 450mV), and transition frequency specification (280MHz) provides additional performance data not available for the original part.

2SCR552PFRAT100 (Rohm Semiconductor) is designated for automotive applications and carries AEC-Q101 qualification. This variant is appropriate for designs requiring automotive-grade components with formal qualification documentation. Inventory is more limited (1,778 pcs) compared to the standard 2SCR552P5T100. Both Rohm devices are REACH unaffected and carry identical ECCN and HTSUS classifications as the original part.

Selection between the two Rohm substitutes depends on application requirements: use 2SCR552P5T100 for standard industrial and consumer applications, and 2SCR552PFRAT100 for automotive or mission-critical applications requiring AEC-Q101 qualification.

Frequently Asked Questions (FAQ)

Q: Can the 2SCR552P5T100 directly replace the FJC1963STF without circuit modification?

A: Yes. Both devices share identical electrical ratings for collector current (3A), collector-emitter breakdown voltage (30V), and power dissipation (500mW). The TO-243AA package is mechanically equivalent to SOT-89-3, enabling direct PCB footprint compatibility. No circuit modifications are required.

Q: What is the difference between 2SCR552P5T100 and 2SCR552PFRAT100?

A: Both parts are electrically and mechanically identical. The 2SCR552PFRAT100 carries automotive-grade designation with AEC-Q101 qualification, making it suitable for automotive applications. The 2SCR552P5T100 is the standard industrial variant. Selection depends on application requirements and qualification mandates.

Q: Are there differences in Vce saturation between the FJC1963STF and substitute parts?

A: The FJC1963STF specifies 450mV maximum Vce saturation at 150mA/1.5A, while both Rohm substitutes specify 400mV at 50mA/1A. The Rohm devices demonstrate lower saturation voltage under their specified test conditions. Circuit designs relying on specific saturation characteristics should account for this difference in switching applications.

Q: What is the significance of the 280MHz transition frequency on the Rohm parts?

A: The 2SCR552P5T100 and 2SCR552PFRAT100 specify 280MHz transition frequency, providing defined high-frequency performance. The FJC1963STF does not specify this parameter. For applications operating near or above 100MHz, the Rohm devices provide documented frequency response characteristics.

Q: Are the substitute parts RoHS compliant?

A: Yes. Both 2SCR552P5T100 and 2SCR552PFRAT100 are ROHS3 compliant. The original FJC1963STF does not specify RoHS status. Both substitutes are REACH unaffected.

Q: What inventory considerations apply to these substitutes?

A: The 2SCR552P5T100 has substantial inventory (129,792 pcs), ensuring long-term supply availability. The 2SCR552PFRAT100 has more limited inventory (1,778 pcs). For high-volume production, the standard 2SCR552P5T100 is recommended. For automotive applications requiring AEC-Q101 qualification, the 2SCR552PFRAT100 is the appropriate choice despite lower inventory levels.

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