J201_D27Z JFET N-Channel Equivalent & Substitute Parts

Part Overview

The J201_D27Z 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 necessary for ongoing design support and production continuity. The J201_D27Z serves applications requiring N-Channel JFET functionality with through-hole mounting in legacy or specialized circuit designs.

Substiute Parts

J201_D27Z

onsemiIn Stock: 997J201_D27Z Datasheet

Current PartRFQ

MMBFJ201

onsemiIn Stock: 76135MMBFJ201 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the J201_D27Z is determined by electrical parameter equivalence and functional compatibility. The critical parameters governing substitution are:

• FET Type: N-Channel configuration
• Voltage - Breakdown (V(BR)GSS): 40 V minimum rating
• Current - Drain (Idss) @ Vds (Vgs=0): 200 µA @ 20 V specification
• Voltage - Cutoff (VGS off) @ Id: 300 mV @ 10 nA threshold
• Operating Temperature Range: -55°C to 150°C (TJ)

The MMBFJ201 meets all electrical parameter requirements and maintains identical electrical specifications. The primary distinction is the mounting technology: MMBFJ201 uses surface-mount SOT-23-3 packaging instead of through-hole TO-92-3 packaging. This substitution is valid for applications where PCB layout and assembly process can accommodate surface-mount components.

Parameter Comparison

Engineering Selection Recommendations

The MMBFJ201 is electrically equivalent to the J201_D27Z across all specified electrical parameters. Selection between these devices depends on application requirements and design constraints:

The J201_D27Z is classified as obsolete with 922 pieces in current inventory. The MMBFJ201 is classified as active product status with 76,050 pieces in inventory, providing superior long-term availability and supply chain continuity.

The MMBFJ201 has a lower maximum power rating (350 mW versus 625 mW). Applications requiring sustained power dissipation above 350 mW must verify thermal performance in the SOT-23-3 package or retain the J201_D27Z if through-hole mounting is mandatory.

Both devices are REACH Unaffected and classified under ECCN EAR99. The MMBFJ201 carries RoHS3 Compliance certification, while the J201_D27Z does not specify RoHS status.

Frequently Asked Questions (FAQ)

Q: Can MMBFJ201 directly replace J201_D27Z in existing designs?

A: Electrical substitution is valid. The MMBFJ201 matches all specified electrical parameters. Physical substitution requires PCB redesign to accommodate SOT-23-3 surface-mount packaging instead of TO-92-3 through-hole mounting. Thermal design review is necessary if power dissipation approaches or exceeds 350 mW.

Q: What is the primary difference between J201_D27Z and MMBFJ201?

A: The devices are electrically identical. The J201_D27Z uses through-hole TO-92-3 packaging; the MMBFJ201 uses surface-mount SOT-23-3 packaging. The MMBFJ201 has a lower maximum power rating (350 mW versus 625 mW).

Q: Why is J201_D27Z classified as obsolete?

A: Product status reflects manufacturer lifecycle decisions. The MMBFJ201 is the active equivalent offering identical electrical performance with modern surface-mount packaging and improved supply availability.

Q: Are there compliance differences between these parts?

A: Both devices are REACH Unaffected and EAR99 classified. The MMBFJ201 is RoHS3 Compliant; the J201_D27Z does not specify RoHS compliance status.

Q: What thermal considerations apply to the MMBFJ201 substitute?

A: The SOT-23-3 package has lower thermal mass than TO-92-3. Applications with sustained power dissipation above 350 mW require thermal analysis to confirm adequate heat dissipation in the target environment.