MJ11021 Equivalent & Substitute Parts

Part Overview

The MJ11021 is a PNP Darlington bipolar junction transistor manufactured by onsemi, rated for 250 V collector-emitter breakdown voltage and 15 A maximum collector current in a TO-204 (TO-3) through-hole package. This component is classified as obsolete, which necessitates identification of equivalent substitute parts for ongoing design support and procurement continuity. The MJ11021 delivers 175 W maximum power dissipation and operates across a temperature range of -65°C to 200°C, making it suitable for high-power switching and amplification applications in industrial and consumer electronics.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP - Darlington	—
Current - Collector (Ic) (Max)	15	A
Voltage - Collector Emitter Breakdown (Max)	250	V
Vce Saturation (Max) @ Ib, Ic	3.4 V @ 150 mA, 15 A	V
Current - Collector Cutoff (Max)	1	mA
DC Current Gain (hFE) (Min) @ Ic, Vce	400 @ 10 A, 5 V	—
Power - Max	175	W
Operating Temperature	-65 to 200	°C (TJ)
Mounting Type	Through Hole	—
Package / Case	TO-204AA, TO-3	—

Substitute Part Grouping Explanation

Substitution of the MJ11021 is determined by electrical and mechanical parameter equivalence across the following criteria:

Electrical Parameters:

Transistor topology: PNP Darlington configuration
Maximum collector current: 15 A
Collector-emitter breakdown voltage: 250 V
Saturation voltage: 3.4 V @ 150 mA, 15 A
DC current gain: 400 (minimum) @ 10 A, 5 V
Maximum power dissipation: 175 W
Collector cutoff current: 1 mA (maximum)

Mechanical Parameters:

Package type: TO-204 (TO-3) through-hole
Operating temperature range: -65°C to 200°C

Parts meeting all electrical and mechanical specifications are classified as direct substitutes. The MJ11021G satisfies all parameter requirements and is therefore a valid equivalent.

Parameter Comparison

Parameter	MJ11021	MJ11021G	Match
Transistor Type	PNP - Darlington	PNP - Darlington	✓
Current - Collector (Ic) (Max)	15 A	15 A	✓
Voltage - Collector Emitter Breakdown (Max)	250 V	250 V	✓
Vce Saturation (Max) @ Ib, Ic	3.4 V @ 150 mA, 15 A	3.4 V @ 150 mA, 15 A	✓
Current - Collector Cutoff (Max)	1 mA	1 mA	✓
DC Current Gain (hFE) (Min) @ Ic, Vce	400 @ 10 A, 5 V	400 @ 10 A, 5 V	✓
Power - Max	175 W	175 W	✓
Operating Temperature	-65 to 200°C (TJ)	-65 to 200°C (TJ)	✓
Mounting Type	Through Hole	Through Hole	✓
Package / Case	TO-204AA, TO-3	TO-204AA, TO-3	✓

Engineering Selection Recommendations

The MJ11021 is classified as obsolete, while the MJ11021G is active and available in production quantities. Both parts are manufactured by onsemi and share identical electrical and mechanical specifications.

Compliance Considerations:

The MJ11021 is RoHS non-compliant and carries REACH Unaffected status. The MJ11021G is ROHS3 compliant and also carries REACH Unaffected status. For applications subject to RoHS directives or customer compliance requirements, the MJ11021G is the appropriate selection.

Availability:

The MJ11021G is supplied in tray packaging with active product status and represents the current production equivalent. The MJ11021 remains available in limited inventory (2160 pcs) but is no longer actively manufactured.

Direct Substitution:

The MJ11021G provides complete electrical and mechanical equivalence to the MJ11021 and is suitable for direct replacement in all applications where the original part was specified.

Frequently Asked Questions (FAQ)

Q: Can the MJ11021G directly replace the MJ11021 in existing designs?

A: Yes. The MJ11021G is electrically and mechanically identical to the MJ11021 across all specified parameters, including collector current, breakdown voltage, saturation voltage, current gain, power rating, temperature range, and TO-204 package configuration.

Q: What is the primary difference between the MJ11021 and MJ11021G?

A: The MJ11021G is the active production equivalent with ROHS3 compliance, while the MJ11021 is obsolete and RoHS non-compliant. Both parts are manufactured by onsemi and share identical electrical specifications.

Q: Are there packaging differences between these parts?

A: The MJ11021 is supplied in standard packaging, while the MJ11021G is supplied in tray packaging. Both use the TO-204 (TO-3) through-hole package configuration with identical pin assignments and mechanical dimensions.

Q: Which part should be selected for new designs?

A: The MJ11021G should be selected for new designs due to its active product status, ROHS3 compliance, and ongoing manufacturing support.

Q: Are there any thermal or electrical performance differences?

A: No. Both parts operate across the identical temperature range (-65°C to 200°C), deliver 175 W maximum power dissipation, and exhibit identical electrical characteristics including saturation voltage, current gain, and breakdown voltage.

Q: What is the base product number for these parts?

A: The base product number is MJ11021. The MJ11021G represents a variant designation reflecting packaging and compliance updates.

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