MJF18004 Equivalent & Substitute Parts

Part Overview

The MJF18004 is an NPN bipolar junction transistor (BJT) manufactured by onsemi, designed for high-voltage switching applications. This device operates at 450 V collector-emitter breakdown voltage with a maximum collector current of 5 A and 35 W power dissipation capability. The transistor is housed in a TO-220-3 Full Pack through-hole package and features a transition frequency of 13 MHz, making it suitable for moderate-speed switching mode power supply applications within the SWITCHMODE™ series.

The MJF18004 carries an obsolete product status. Locating equivalent substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and access components with active manufacturing support and current compliance certifications.

Substiute Parts

MJF18004

onsemiIn Stock: 1127MJF18004 Datasheet

Current PartRFQ

MJF18004G

onsemiIn Stock: 2190MJF18004G Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MJF18004 is determined by electrical and mechanical parameter equivalence. The following criteria establish valid substitution:

Electrical Parameters (Must Match):

• Transistor Type: NPN
• Voltage - Collector Emitter Breakdown (Max): 450 V
• Current - Collector (Ic) (Max): 5 A
• Power - Max: 35 W
• Frequency - Transition: 13 MHz
• Vce Saturation (Max) @ Ib, Ic: 750mV @ 500mA, 2.5A
• DC Current Gain (hFE) (Min) @ Ic, Vce: 14 @ 300mA, 5V
• Current - Collector Cutoff (Max): 100 µA
• Operating Temperature Range: -65°C to 150°C (TJ)

Mechanical Parameters (Must Match):

• Package / Case: TO-220-3 Full Pack
• Mounting Type: Through Hole

The MJF18004G meets all electrical and mechanical equivalence criteria and is classified as a direct substitute.

Parameter Comparison

Engineering Selection Recommendations

The MJF18004G is a direct electrical and mechanical equivalent to the MJF18004. Both devices share identical electrical specifications across all critical parameters: collector-emitter breakdown voltage, maximum collector current, power dissipation, transition frequency, saturation voltage, DC current gain, and operating temperature range. Both are packaged in TO-220-3 Full Pack through-hole configuration.

The primary distinction between these parts is product lifecycle status and regulatory compliance. The MJF18004 is classified as obsolete, whereas the MJF18004G maintains active product status with current manufacturing support. Additionally, the MJF18004G carries ROHS3 compliance certification, meeting current environmental and regulatory requirements, while the MJF18004 is RoHS non-compliant.

For new designs and ongoing production requiring long-term component availability and regulatory compliance, the MJF18004G is the appropriate selection. For legacy system maintenance where original specifications must be preserved, the MJF18004 remains functionally equivalent.

Frequently Asked Questions (FAQ)

Q: Can the MJF18004G be used as a direct replacement for the MJF18004?

A: Yes. The MJF18004G is electrically and mechanically equivalent to the MJF18004. All electrical parameters—including voltage rating, current capacity, power dissipation, frequency response, and saturation characteristics—are identical. Both devices use the same TO-220-3 Full Pack through-hole package.

Q: What is the primary reason to substitute the MJF18004 with the MJF18004G?

A: The MJF18004 is obsolete with no active manufacturing support. The MJF18004G is an active product with current availability. Additionally, the MJF18004G meets ROHS3 compliance requirements, whereas the MJF18004 does not.

Q: Are there any differences in package or pinout between these parts?

A: No. Both the MJF18004 and MJF18004G use the TO-220-3 Full Pack through-hole package with identical pinout and mechanical dimensions. No PCB layout modifications are required for substitution.

Q: What is the difference between the MJF18004 and MJF18004G part numbers?

A: The MJF18004G includes a suffix designating the packaging format (Tube) and manufacturing revision. The base product number MJF18 remains consistent. The electrical specifications are identical.

Q: Are there any compliance or certification differences?

A: Yes. The MJF18004G is ROHS3 compliant and carries current regulatory certifications. The MJF18004 is RoHS non-compliant. Both devices maintain REACH Unaffected status and EAR99 export classification.

Q: Can the MJF18004 and MJF18004G be used interchangeably in existing designs?

A: Yes, from an electrical and mechanical standpoint. However, for new production runs and designs requiring regulatory compliance, the MJF18004G is the recommended selection due to its active status and ROHS3 certification.