TIP122FP Equivalent & Substitute Parts

Part Overview

The TIP122FP is an NPN Darlington bipolar junction transistor manufactured by STMicroelectronics, designed for high-current switching and amplification applications. This device features a 100 V collector-emitter breakdown voltage rating and a maximum collector current of 5 A, housed in a TO-220-3 through-hole package. The TIP122FP is classified as obsolete, making identification of functionally equivalent substitute components necessary for ongoing design support, maintenance, and production continuity. Active alternatives with identical electrical specifications and package configurations are available to ensure uninterrupted component availability.

Substiute Parts

TIP122FP

STMicroelectronicsIn Stock: 872TIP122FP Datasheet

Current PartRFQ

MJF122G

onsemiIn Stock: 25127MJF122G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute components for the TIP122FP are identified based on strict electrical and mechanical parameter matching within the NPN Darlington transistor category. The substitution criteria are defined by the following parameters:

Critical Matching Parameters:

• Transistor Type: NPN - Darlington configuration
• Current - Collector (Ic) (Max): 5 A minimum rating
• Voltage - Collector Emitter Breakdown (Max): 100 V minimum rating
• Power - Max: 2 W minimum rating
• Mounting Type: Through Hole
• Package / Case: TO-220-3 Full Pack
• RoHS Compliance: ROHS3 Compliant

Substitute parts must meet or exceed all critical parameters to ensure functional equivalence in existing circuit designs. Variations in secondary parameters such as DC current gain (hFE), saturation voltage (Vce), and cutoff current do not disqualify a component from substitution provided the primary electrical and mechanical specifications are satisfied.

Parameter Comparison

Engineering Selection Recommendations

TIP122FP (STMicroelectronics): This component is classified as obsolete. While inventory remains available (798 pcs), long-term procurement cannot be guaranteed. Selection of this part is appropriate only for legacy system maintenance or repair applications where design continuity is required.

MJF122G (onsemi): This substitute component is classified as active with substantial inventory availability (25,100 pcs). The MJF122G meets all critical electrical and mechanical parameters specified for the TIP122FP and carries identical RoHS3 compliance and REACH unaffected status. The MJF122G is the recommended selection for new designs, production continuity, and long-term component availability. Both components are classified under ECCN EAR99 and share the same HTSUS code (8541.29.0095), confirming regulatory equivalence.

Frequently Asked Questions (FAQ)

Q: Can the MJF122G directly replace the TIP122FP in existing circuit designs?

A: Yes. The MJF122G meets all critical electrical specifications (5 A collector current, 100 V breakdown voltage, 2 W power rating) and is housed in the identical TO-220-3 through-hole package. Direct pin-for-pin substitution is supported without circuit modification.

Q: What is the difference between the TIP122FP and MJF122G?

A: Both devices are NPN Darlington transistors with identical primary ratings. Secondary parameter differences include DC current gain (hFE) of 1000 minimum for TIP122FP versus 2000 minimum for MJF122G, and saturation voltage (Vce) of 4 V for TIP122FP versus 3.5 V for MJF122G. These variations do not affect functional equivalence in standard switching applications. The MJF122G features an extended operating temperature range of −65°C to 150°C compared to the TIP122FP maximum of 150°C.

Q: Why is the TIP122FP classified as obsolete?

A: Obsolete status indicates that the manufacturer (STMicroelectronics) has discontinued production. The MJF122G from onsemi provides an active, functionally equivalent alternative with ongoing manufacturing support.

Q: Are there any compliance or regulatory differences between these components?

A: No. Both the TIP122FP and MJF122G are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99. They share the same HTSUS tariff code (8541.29.0095), confirming regulatory equivalence.

Q: What packaging formats are available for these components?

A: Both components are supplied in TO-220-3 through-hole packages. The TIP122FP is available in full pack format, while the MJF122G is supplied in tube packaging. Both formats are compatible with standard through-hole assembly processes.

Q: Should I consider the MJF122G for new designs?

A: Yes. The MJF122G is the recommended selection for new designs due to its active product status, superior DC current gain characteristics, and guaranteed long-term availability. The component meets all electrical and mechanical requirements of the TIP122FP while offering enhanced performance margins.