J202 JFET N-Channel Transistor Equivalent & Substitute Parts

Part Overview

The J202 is an N-channel JFET transistor manufactured by onsemi, rated for 40 V breakdown voltage with a maximum power dissipation of 625 mW in a through-hole TO-92-3 package. This device is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity. The J202 serves applications requiring N-channel junction field-effect transistor functionality in legacy through-hole designs.

Substiute Parts

J202

onsemiIn Stock: 2300J202 Datasheet

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MMBFJ202

onsemiIn Stock: 80322MMBFJ202 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the J202 is determined by matching the following critical electrical parameters: N-channel FET type, 40 V breakdown voltage rating, 900 µA drain current specification at 20 V, and 800 mV cutoff voltage. The MMBFJ202 satisfies all electrical performance criteria required for functional equivalence. The primary distinction between the J202 and MMBFJ202 is the package format: the J202 uses through-hole TO-92-3 mounting, while the MMBFJ202 uses surface-mount SOT-23-3 packaging. This substitution is valid when the target application can accommodate surface-mount technology or when a board redesign is feasible.

Parameter Comparison

Engineering Selection Recommendations

The MMBFJ202 provides electrical equivalence to the J202 across all specified performance parameters. Selection between these parts depends on application constraints:

For applications where power dissipation does not exceed 350 mW, the MMBFJ202 is electrically suitable and offers the advantage of active product status with ROHS3 compliance. The MMBFJ202 is available in high inventory (80,300 pcs), supporting production continuity.

For applications requiring the full 625 mW power rating of the J202, the MMBFJ202 may not be appropriate due to its lower maximum power specification. In such cases, alternative N-channel JFET devices with matching electrical parameters and higher power ratings should be evaluated.

The packaging difference (through-hole versus surface-mount) requires circuit board redesign or the use of adapter modules if direct pin-for-pin substitution is required.

Frequently Asked Questions (FAQ)

Q: Can the MMBFJ202 directly replace the J202 in existing through-hole designs?

A: Direct pin-for-pin replacement is not possible due to package format differences. The J202 uses through-hole TO-92-3 mounting, while the MMBFJ202 uses surface-mount SOT-23-3 packaging. Board redesign or adapter solutions are required.

Q: Are the electrical characteristics of the MMBFJ202 identical to the J202?

A: The MMBFJ202 matches the J202 in breakdown voltage (40 V), drain current (900 µA @ 20 V), and cutoff voltage (800 mV @ 10 nA). The maximum power rating differs: J202 is rated at 625 mW, while MMBFJ202 is rated at 350 mW.

Q: What is the significance of the J202 being classified as obsolete?

A: Obsolete status indicates the J202 is no longer in active production. The MMBFJ202, classified as active, represents the current production equivalent from onsemi and ensures long-term supply availability.

Q: Are both parts compliant with environmental regulations?

A: Both the J202 and MMBFJ202 are REACH Unaffected. The MMBFJ202 carries ROHS3 compliance certification. Both are classified as Moisture Sensitivity Level 1 (Unlimited).

Q: Which part should be selected for new designs?

A: For new designs, the MMBFJ202 is recommended due to its active product status, ROHS3 compliance, and high inventory availability. Ensure the application power dissipation requirement does not exceed 350 mW and that surface-mount technology is acceptable for the design.