J270_D27Z JFET P-Channel Equivalent & Substitute Parts

Part Overview

The J270_D27Z is a P-Channel JFET transistor manufactured by onsemi, rated for 30 V breakdown voltage with 350 mW power dissipation 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 J270_D27Z serves applications requiring P-channel junction field-effect transistor functionality in through-hole form factor implementations.

Substiute Parts

J270_D27Z

onsemiIn Stock: 766J270_D27Z Datasheet

Current PartRFQ

MMBFJ270

onsemiIn Stock: 17305MMBFJ270 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the J270_D27Z is determined by electrical parameter equivalence and functional compatibility. The critical parameters governing substitution are:

• P-Channel FET topology
• 30 V breakdown voltage rating (V(BR)GSS)
• 2 mA drain current specification (Idss @ Vds, Vgs=0)
• 500 mV cutoff voltage (VGS off @ Id)
• Operating temperature range of -55°C to 150°C

The MMBFJ270 shares identical electrical characteristics across all specified parameters. The primary distinction is packaging format: the J270_D27Z uses through-hole TO-92-3 mounting, while the MMBFJ270 employs surface-mount SOT-23-3 packaging. This packaging difference necessitates circuit board redesign and assembly process modification but does not alter electrical performance or functional capability.

Parameter Comparison

Engineering Selection Recommendations

The MMBFJ270 provides electrical equivalence to the J270_D27Z across all specified junction field-effect transistor parameters. Selection between these devices is determined by form factor requirements and thermal design constraints.

The J270_D27Z, classified as obsolete, has limited availability. The MMBFJ270 maintains active product status with significantly higher inventory levels (17,200 pcs vs. 742 pcs), ensuring supply chain continuity.

Both devices carry identical compliance certifications: REACH Unaffected status, EAR99 ECCN classification, and HTSUS code 8541.21.0095. The MMBFJ270 additionally carries RoHS3 compliance certification.

The MMBFJ270 exhibits reduced maximum power dissipation (225 mW vs. 350 mW). Applications requiring the full 350 mW thermal budget must evaluate whether the 225 mW rating of the surface-mount alternative remains adequate for the intended circuit design.

Frequently Asked Questions (FAQ)

Q: Can the MMBFJ270 directly replace the J270_D27Z in existing circuit boards?

A: Electrical substitution is valid; however, physical replacement requires circuit board redesign. The J270_D27Z uses through-hole TO-92-3 leads for insertion into plated holes, while the MMBFJ270 uses surface-mount SOT-23-3 pads. Assembly process modification from through-hole to surface-mount technology is necessary.

Q: Are the electrical characteristics identical between these parts?

A: Yes. Both devices share identical P-Channel JFET topology, 30 V breakdown voltage, 2 mA drain current specification, 500 mV cutoff voltage, and -55°C to 150°C operating temperature range.

Q: What is the significance of the power rating difference?

A: The J270_D27Z is rated for 350 mW maximum power dissipation, while the MMBFJ270 is rated for 225 mW. Circuits designed within the 225 mW thermal envelope are fully compatible. Designs approaching or exceeding 225 mW require thermal analysis to confirm the surface-mount package can dissipate the required power without exceeding junction temperature limits.

Q: Why does the MMBFJ270 have higher inventory availability?

A: The MMBFJ270 maintains active product status with ongoing manufacturing, while the J270_D27Z is classified as obsolete with no new production. Active products typically maintain higher stock levels to support current market demand.

Q: Are compliance certifications equivalent?

A: Both devices carry REACH Unaffected and EAR99 ECCN designations. The MMBFJ270 additionally carries RoHS3 compliance certification, providing enhanced environmental compliance for applications subject to RoHS requirements.