FJD5555TM Equivalent & Substitute Parts

Part Overview

The FJD5555TM is an NPN bipolar junction transistor manufactured by onsemi, rated for 400 V collector-emitter breakdown voltage and 5 A maximum collector current in a Surface Mount TO-252AA (DPAK) package. This device is classified as Active product status and is ROHS3 compliant with unlimited moisture sensitivity rating (MSL 1).

Substitute parts are identified when equivalent electrical performance can be achieved within the specified parameter ranges of the application circuit. Due to inventory availability, packaging preferences, or design revision requirements, alternative part numbers may be selected provided they meet the critical electrical and mechanical specifications of the original design.

Substiute Parts

FJD5555TM

onsemiIn Stock: 5194FJD5555TM Datasheet

Current PartRFQ

MJD340G

onsemiIn Stock: 2013MJD340G Datasheet

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MJD340RLG

onsemiIn Stock: 1313MJD340RLG Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the FJD5555TM is determined by the following critical electrical parameters:

1. Transistor Type: Must be NPN configuration
2. Voltage Rating: Collector-emitter breakdown voltage must equal or exceed 400 V
3. Current Rating: Maximum collector current must equal or exceed 5 A
4. Power Dissipation: Maximum power rating must support the application thermal requirements
5. Package Compatibility: Must use TO-252-3 DPAK surface mount package
6. Saturation Characteristics: Vce(sat) performance at specified base and collector currents
7. DC Current Gain: hFE minimum specification at rated operating conditions
8. Compliance: RoHS3 compliance and MSL rating must be maintained

The identified substitute parts (MJD340RLG and MJD340G) share identical package geometry and mounting type. However, these parts operate at reduced voltage (300 V) and current (500 mA) ratings compared to the FJD5555TM. Substitution is valid only in applications where the circuit design operates within the lower electrical specifications of the substitute devices.

Parameter Comparison

Engineering Selection Recommendations

FJD5555TM is the primary selection for applications requiring 400 V breakdown voltage and 5 A collector current capacity. This part maintains Active product status with full ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1), suitable for standard manufacturing and storage conditions.

MJD340RLG (Tape & Reel packaging) is selected when substitute operation is required within reduced voltage (300 V) and current (500 mA) specifications. This part is Active status with ROHS3 compliance. Tape & Reel packaging is appropriate for high-volume automated assembly processes.

MJD340G (Tube packaging) provides equivalent electrical performance to MJD340RLG with identical electrical specifications. Tube packaging is appropriate for lower-volume applications or manual assembly processes. Both MJD340 variants are Active status with ROHS3 compliance.

All three parts share identical TO-252-3 DPAK package geometry, enabling direct physical substitution on printed circuit boards. Electrical substitution requires circuit design verification to confirm operation within the reduced voltage and current ratings of the MJD340 series.

Frequently Asked Questions (FAQ)

Q: Can MJD340RLG or MJD340G be used as direct replacements for FJD5555TM in all applications?

A: Direct electrical substitution is valid only in applications where the circuit operates at or below 300 V collector-emitter voltage and 500 mA collector current. The FJD5555TM is rated for 400 V and 5 A; the MJD340 series cannot be substituted in circuits requiring these higher ratings.

Q: What is the difference between MJD340RLG and MJD340G?

A: Both parts have identical electrical specifications. The difference is packaging format: MJD340RLG is supplied in Tape & Reel (TR) format for automated assembly, while MJD340G is supplied in Tube format for manual or lower-volume assembly. Both are Surface Mount TO-252-3 DPAK packages.

Q: Are all three parts physically compatible on the same PCB footprint?

A: Yes. FJD5555TM, MJD340RLG, and MJD340G all use the TO-252-3 DPAK (2 Leads + Tab) package with identical pin configuration and footprint dimensions. Physical substitution on the PCB requires no layout changes.

Q: Do all parts meet the same compliance requirements?

A: Yes. FJD5555TM, MJD340RLG, and MJD340G are all ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating. REACH status is Unaffected for all three parts. ECCN classification is EAR99 for all parts.

Q: What is the maximum operating temperature for each part?

A: All three parts are rated for maximum junction temperature (TJ) of 150°C. MJD340RLG and MJD340G specify operating temperature range of −65°C to 150°C. FJD5555TM specifies maximum operating temperature of 150°C.

Q: Can FJD5555TM be substituted with MJD340 series in high-voltage applications?

A: No. The MJD340 series is rated for maximum 300 V collector-emitter breakdown voltage. Applications requiring 400 V operation must use FJD5555TM or equivalent 400 V rated devices.

Q: What is the significance of the different power ratings (1.34 W vs. 15 W)?

A: Power rating reflects maximum thermal dissipation capability under specified conditions. FJD5555TM is rated 1.34 W; MJD340 series is rated 15 W. Higher power rating does not indicate superior performance; it reflects different thermal design and package thermal characteristics. Selection is based on circuit current and voltage requirements, not power rating alone.