Equivalent & Substitute Parts for MJF6388

Part Overview

The MJF6388 is an NPN Darlington bipolar junction transistor manufactured by onsemi, rated for 100 V collector-emitter breakdown voltage and 10 A maximum collector current in a TO-220FP through-hole package. This component is classified as obsolete, necessitating identification of equivalent and substitute parts for ongoing design requirements and production continuity. Active alternatives with compatible electrical and mechanical specifications are available from onsemi and STMicroelectronics.

Substiute Parts

MJF6388

onsemiIn Stock: 1227MJF6388 Datasheet

Current PartRFQ

MJF6388G

onsemiIn Stock: 3151MJF6388G Datasheet

DirectRFQ

BDW94CFTU

onsemiIn Stock: 4474BDW94CFTU Datasheet

SimilarRFQ

BDW93CFP

STMicroelectronicsIn Stock: 1139BDW93CFP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MJF6388 is determined by the following critical parameters: transistor type (NPN - Darlington), collector-emitter breakdown voltage (100 V), maximum collector current rating (10 A or higher), saturation voltage characteristics, and through-hole TO-220 package compatibility. Parts are grouped into two categories:

Direct Equivalent: MJF6388G maintains identical electrical specifications and package configuration, differing only in product status (active versus obsolete) and packaging format (tube versus full pack).

Similar Substitutes: BDW93CFP and BDW94CFTU provide compatible voltage and package specifications. BDW93CFP is an NPN Darlington with 12 A current rating and 33 W power dissipation. BDW94CFTU is a PNP Darlington with 12 A current rating and 80 W power dissipation, suitable for complementary circuit topologies.

Parameter Comparison

Engineering Selection Recommendations

MJF6388G is the primary substitute for MJF6388. Both parts are manufactured by onsemi and share identical electrical specifications, voltage ratings, current ratings, saturation characteristics, and thermal operating range. MJF6388G is active in production status and ROHS3 compliant, addressing the obsolescence and regulatory compliance limitations of the original MJF6388. The packaging format difference (tube versus full pack) does not affect electrical or mechanical compatibility.

BDW93CFP provides an alternative NPN Darlington solution from STMicroelectronics. It maintains the 100 V voltage rating and TO-220FP package configuration. The 12 A current rating exceeds the MJF6388 specification, and the 33 W power dissipation capability is significantly higher than the 2 W rating of the original part. BDW93CFP is ROHS3 compliant and active in production. The reduced DC current gain (750 versus 3000) and increased collector cutoff current (1mA versus 10µA) represent measurable differences in device characteristics.

BDW94CFTU is a PNP Darlington complement suitable for applications requiring complementary NPN/PNP pair configurations. It shares the 100 V voltage rating and TO-220 package family. The 12 A current rating and 80 W power dissipation exceed MJF6388 specifications. This part is ROHS3 compliant and active in production. Selection of BDW94CFTU requires circuit topology compatibility with PNP operation.

Frequently Asked Questions (FAQ)

Q: Can MJF6388G be used as a direct replacement for MJF6388?

A: Yes. MJF6388G is electrically and mechanically identical to MJF6388. Both parts feature 100 V breakdown voltage, 10 A maximum collector current, 3000 minimum DC current gain, and TO-220FP package configuration. MJF6388G is active in production and ROHS3 compliant, whereas MJF6388 is obsolete and non-compliant.

Q: What are the differences between BDW93CFP and MJF6388?

A: BDW93CFP and MJF6388 share the same 100 V voltage rating and TO-220FP package. BDW93CFP has a higher current rating (12 A versus 10 A) and significantly higher power dissipation (33 W versus 2 W). The DC current gain is lower (750 versus 3000), and the collector cutoff current is higher (1mA versus 10µA). BDW93CFP is manufactured by STMicroelectronics and is ROHS3 compliant.

Q: When should BDW94CFTU be selected instead of MJF6388?

A: BDW94CFTU is a PNP Darlington and should be selected when the circuit topology requires a complementary PNP transistor paired with an NPN device. It is not a direct replacement for NPN-only applications. BDW94CFTU provides 100 V voltage rating, 12 A current capability, and 80 W power dissipation in a TO-220 package.

Q: Are all substitute parts compatible with the TO-220FP footprint?

A: MJF6388G and BDW93CFP use the TO-220FP package. BDW94CFTU uses the TO-220F-3 package variant. Both package variants are TO-220-3 full pack configurations with identical pin assignments and through-hole mounting compatibility. Mechanical fit on standard TO-220 footprints is maintained across all three substitute parts.

Q: What is the significance of the RoHS compliance difference?

A: MJF6388 is RoHS non-compliant, while MJF6388G, BDW93CFP, and BDW94CFTU are ROHS3 compliant. For applications subject to RoHS regulations or customer requirements, only the compliant alternatives are acceptable. MJF6388G is the recommended choice for direct replacement with regulatory compliance.

Q: How do the DC current gain specifications affect circuit design?

A: MJF6388 and MJF6388G specify 3000 minimum DC current gain at 3 A collector current and 4 V collector-emitter voltage. BDW93CFP and BDW94CFTU specify 750 minimum DC current gain at 5 A collector current and 3 V collector-emitter voltage. Lower current gain requires higher base drive current to achieve saturation. Circuit designs relying on specific gain characteristics must account for these differences.

Q: Can MJF6388 be used in applications requiring higher power dissipation?

A: No. MJF6388 is rated for 2 W maximum power dissipation. Applications requiring higher power handling must use BDW93CFP (33 W) or BDW94CFTU (80 W). Exceeding the 2 W rating will result in thermal stress and device failure.