FJY3003R Equivalent & Substitute Parts

Part Overview

The FJY3003R is a pre-biased NPN bipolar junction transistor (BJT) manufactured by onsemi, designed for surface mount applications in the SC-89-3 package. This component integrates internal base and emitter resistors, enabling simplified circuit design for switching and amplification applications. The device is rated for 50 V collector-emitter breakdown voltage, 100 mA maximum collector current, and 200 mW power dissipation with a transition frequency of 250 MHz.

The FJY3003R is classified as obsolete. Equivalent substitute parts are available from active product lines that maintain electrical and mechanical compatibility within the specified parameter ranges, ensuring continued design support and supply chain availability.

Substiute Parts

FJY3003R

onsemiIn Stock: 1019FJY3003R Datasheet

Current PartRFQ

DTC124EET1G

onsemiIn Stock: 50181DTC124EET1G Datasheet

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DDTC143FE-7-F

Diodes IncorporatedIn Stock: 1170DDTC143FE-7-F Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the FJY3003R is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Maximum collector current: 100 mA (must equal or exceed)
• Collector-emitter breakdown voltage: 50 V (must equal or exceed)
• Transistor type: NPN pre-biased configuration
• Internal base resistor (R1): 22 kOhms (must match for circuit bias point stability)
• Internal emitter-base resistor (R2): 22 kOhms (must match for circuit bias point stability)
• Transition frequency: 250 MHz (must equal or exceed for high-frequency applications)
• Power dissipation: 200 mW (must equal or exceed)

Mechanical Compatibility Criteria:

• Mounting type: Surface mount
• Pin configuration: Three-terminal pre-biased BJT structure

Substitute parts must maintain these electrical specifications and surface mount compatibility. Package form factor differences (SC-89 versus SC-75 or SOT-523) are acceptable provided the three-terminal pre-biased BJT structure is preserved and PCB layout accommodates the alternative package dimensions.

Parameter Comparison

Engineering Selection Recommendations

DTC124EET1G (onsemi)

The DTC124EET1G is an active product from onsemi with identical electrical specifications to the FJY3003R: 100 mA collector current, 50 V breakdown voltage, 22 kOhm base and emitter-base resistors, and 200 mW power rating. The primary difference is the package form factor (SC-75/SOT-416 versus SC-89/SOT-490). This substitute is RoHS3 compliant and carries REACH Unaffected status. Selection of this part requires PCB layout modification to accommodate the SC-75 package footprint. Inventory availability is substantial (50,100 pieces).

DDTC143FE-7-F (Diodes Incorporated)

The DDTC143FE-7-F is an active product from Diodes Incorporated that meets the core electrical requirements: 100 mA collector current, 50 V breakdown voltage, 250 MHz transition frequency, and 22 kOhm emitter-base resistor. The base resistor (R1) is 4.7 kOhms instead of 22 kOhms, which alters the internal bias network and results in different circuit bias point characteristics. Power dissipation is rated at 150 mW, which is lower than the FJY3003R specification. The package is SOT-523, requiring PCB layout modification. This part is RoHS3 compliant and carries REACH Unaffected status. Inventory availability is 1,079 pieces.

Selection Guidance:

For direct electrical substitution with minimal circuit redesign, the DTC124EET1G is preferred due to matching internal resistor values (R1 and R2 both 22 kOhms) and identical power rating. The DDTC143FE-7-F is suitable only when the different base resistor value (4.7 kOhms) and lower power rating (150 mW) are compatible with the application requirements. Both substitute parts are active products with established supply chains and compliance certifications.

Frequently Asked Questions (FAQ)

Q: Can the DTC124EET1G directly replace the FJY3003R without circuit modification?

A: The DTC124EET1G maintains identical electrical specifications (100 mA, 50 V, 22 kOhm resistors, 200 mW). However, the package changes from SC-89 (SOT-490) to SC-75 (SOT-416), requiring PCB footprint modification. No circuit redesign is necessary if the new package footprint is accommodated on the board.

Q: Why does the DDTC143FE-7-F have a different base resistor value?

A: The DDTC143FE-7-F incorporates a 4.7 kOhm base resistor (R1) instead of 22 kOhms. This is an internal design difference between manufacturers and affects the pre-bias network. The lower R1 value results in higher base current and different bias point characteristics. This part is suitable only when the application circuit is designed or verified to operate with this different bias configuration.

Q: What is the impact of the lower power rating on the DDTC143FE-7-F?

A: The DDTC143FE-7-F is rated for 150 mW maximum power dissipation compared to 200 mW for the FJY3003R. Applications requiring sustained power dissipation above 150 mW must use the DTC124EET1G or FJY3003R. For typical switching applications with low duty cycles, the 150 mW rating is generally sufficient.

Q: Are package changes between SC-89, SC-75, and SOT-523 interchangeable on the PCB?

A: No. SC-89 (SOT-490), SC-75 (SOT-416), and SOT-523 are distinct package outlines with different pin spacing and footprint dimensions. PCB layout and solder pad patterns must be modified to accommodate each package type. Consult the respective package datasheets for exact dimensions and pin configurations.

Q: What compliance certifications apply to the substitute parts?

A: Both DTC124EET1G and DDTC143FE-7-F are RoHS3 compliant and carry REACH Unaffected status. Both are classified under ECCN EAR99 for export control purposes. These certifications match the compliance profile of the FJY3003R.

Q: Is the transition frequency specification critical for substitution?

A: The FJY3003R and DDTC143FE-7-F both specify 250 MHz transition frequency. The DTC124EET1G does not provide a transition frequency specification in the available data. For applications requiring high-frequency switching or amplification above 200 MHz, the DDTC143FE-7-F is the confirmed choice. For lower-frequency applications, the DTC124EET1G is acceptable.

Q: What is the moisture sensitivity level for these parts?

A: All three parts (FJY3003R, DTC124EET1G, and DDTC143FE-7-F) carry MSL 1 (Unlimited) classification, indicating no moisture sensitivity restrictions during storage or handling.