MJF127 Equivalent & Substitute Parts

Part Overview

The MJF127 is a PNP Darlington bipolar junction transistor manufactured by onsemi, rated for 100 V collector-emitter breakdown voltage and 5 A maximum collector current in a TO-220-3 Full Pack through-hole package. This component is classified as obsolete, making identification of suitable substitutes necessary for ongoing design support and production continuity. The MJF127 is suitable for applications requiring moderate power dissipation (2 W maximum) and high current gain in PNP switching and amplification circuits.

Substiute Parts

MJF127

onsemiIn Stock: 2166MJF127 Datasheet

Current PartRFQ

MJF127G

onsemiIn Stock: 2382MJF127G Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MJF127 is determined by electrical and mechanical parameter equivalence across the following criteria:

Electrical Parameters (Critical for Functional Compatibility):

• Transistor topology: PNP - Darlington configuration
• Maximum collector current: 5 A
• Maximum collector-emitter breakdown voltage: 100 V
• Saturation voltage characteristics: 3.5 V @ 20 mA, 5 A
• Collector cutoff current: 10 µA maximum
• DC current gain (hFE): 2000 minimum @ 3 A, 3 V
• Maximum power dissipation: 2 W
• Operating temperature range: -65°C to 150°C (TJ)

Mechanical Parameters (Critical for Physical Compatibility):

• Mounting type: Through Hole
• Package designation: TO-220-3 Full Pack
• Supplier device package: TO-220FP

The MJF127G meets all electrical and mechanical equivalence criteria and is therefore a direct substitute.

Parameter Comparison

Engineering Selection Recommendations

The MJF127G is a direct electrical and mechanical equivalent to the MJF127. Both components share identical electrical specifications across all critical parameters: collector current rating, breakdown voltage, saturation characteristics, current gain, power dissipation, and operating temperature range. Both are packaged in the TO-220-3 Full Pack configuration suitable for through-hole mounting.

The primary distinction between these parts is product status and regulatory compliance. The MJF127 is classified as obsolete, whereas the MJF127G maintains active product status. Additionally, the MJF127G is ROHS3 compliant, meeting current environmental and hazardous substance restrictions, while the MJF127 is RoHS non-compliant. For new designs and production requiring regulatory compliance with modern standards, the MJF127G is the appropriate selection. For legacy system maintenance where RoHS compliance is not a requirement, the MJF127 remains functionally equivalent.

Frequently Asked Questions (FAQ)

Q: Can the MJF127G be used as a direct replacement for the MJF127 in existing designs?

A: Yes. The MJF127G is electrically and mechanically equivalent to the MJF127. All electrical parameters—collector current, breakdown voltage, saturation voltage, current gain, power rating, and operating temperature—are identical. Both components use the TO-220-3 Full Pack through-hole package. Direct substitution in PCB layouts and circuit designs is supported without modification.

Q: What is the difference between the MJF127 and MJF127G?

A: The MJF127 and MJF127G are electrically identical PNP Darlington transistors with the same electrical ratings and package. The MJF127 is classified as obsolete and is RoHS non-compliant. The MJF127G is an active product that meets ROHS3 compliance standards. The MJF127G is the recommended choice for new production and designs requiring regulatory compliance.

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

A: No. Both the MJF127 and MJF127G use the TO-220-3 Full Pack package with the TO-220FP supplier device package designation. Pinout, lead configuration, and mechanical dimensions are identical. No PCB layout modifications are required when substituting between these parts.

Q: What electrical parameters determine substitution compatibility for PNP Darlington transistors?

A: Substitution compatibility is determined by matching the following electrical parameters: transistor type (PNP - Darlington), maximum collector current (5 A), maximum collector-emitter breakdown voltage (100 V), saturation voltage (3.5 V @ 20 mA, 5 A), collector cutoff current (10 µA), DC current gain (2000 minimum @ 3 A, 3 V), maximum power dissipation (2 W), and operating temperature range (-65°C to 150°C). Mechanical compatibility requires matching package type (TO-220-3 Full Pack) and mounting method (through-hole).

Q: Is the MJF127G available in the same packaging options as the MJF127?

A: The MJF127 is supplied in bulk packaging, while the MJF127G is supplied in tube packaging. Both use the TO-220-3 Full Pack case style and TO-220FP supplier device package. The packaging format does not affect electrical performance or circuit compatibility; it pertains only to order quantity and handling logistics.

Q: What is the RoHS compliance status of these parts?

A: The MJF127 is RoHS non-compliant. The MJF127G is ROHS3 compliant, meeting current environmental and hazardous substance restriction directives. For applications and markets requiring RoHS compliance certification, the MJF127G is the appropriate selection.