2N5485 RF JFET Equivalent & Substitute Parts

Part Overview

The 2N5485 is an RF JFET (Junction Field-Effect Transistor) manufactured by onsemi, designed for RF applications operating at 400MHz with a rated voltage of 15V. This device is packaged in a TO-92-3 (TO-226AA) through-hole configuration and is classified as obsolete. Due to its obsolete status and limited availability in modern manufacturing environments, identifying equivalent substitute parts with compatible electrical and mechanical specifications is necessary for design continuity and production planning.

Substiute Parts

2N5485

onsemiIn Stock: 74392N5485 Datasheet

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MMBF5485

onsemiIn Stock: 65234MMBF5485 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 2N5485 is determined by strict equivalence across the following electrical and mechanical parameters:

Electrical Equivalence Criteria:

• Technology: JFET (N-Channel configuration required)
• Frequency: 400MHz operation capability
• Voltage - Test: 15V
• Voltage - Rated: 25V
• Current Rating: 10mA
• Noise Figure: 4dB

Mechanical Compatibility Considerations:

• Package type determines physical fit and PCB layout compatibility
• Mounting type (through-hole versus surface mount) affects assembly process and board design
• Moisture sensitivity level must be equivalent or superior

The MMBF5485 qualifies as a direct electrical substitute, maintaining identical electrical specifications while offering a surface-mount alternative in SOT-23-3 packaging. This substitution is valid for applications where PCB design and assembly capabilities support surface-mount technology.

Parameter Comparison

Engineering Selection Recommendations

For Direct Electrical Substitution:

The MMBF5485 provides complete electrical equivalence to the 2N5485 across all specified parameters: identical JFET N-Channel technology, 400MHz frequency capability, 15V test voltage, 25V rated voltage, 10mA current rating, and 4dB noise figure. Both devices maintain equivalent moisture sensitivity levels and REACH compliance status.

For Package and Mounting Considerations:

Selection between 2N5485 and MMBF5485 depends on PCB assembly requirements. The 2N5485 uses through-hole TO-92-3 packaging suitable for through-hole assembly processes, while the MMBF5485 uses surface-mount SOT-23-3 packaging for automated surface-mount assembly. These package types are not physically interchangeable without PCB redesign.

Product Status Impact:

The 2N5485 is classified as obsolete, while the MMBF5485 maintains active product status with significantly higher inventory availability (65,200 pieces versus 7,400 pieces). For new designs or production continuity, the MMBF5485 is the recommended selection when surface-mount assembly is feasible.

Compliance and Regulatory:

Both devices maintain REACH Unaffected status and equivalent moisture sensitivity levels, ensuring regulatory compliance across substitution scenarios.

Frequently Asked Questions (FAQ)

Q: Can the MMBF5485 directly replace the 2N5485 in existing designs?

A: Electrical substitution is valid; all electrical parameters are identical. Physical substitution requires PCB redesign due to different package types (TO-92-3 through-hole versus SOT-23-3 surface-mount). Pin-to-pin electrical functionality is equivalent.

Q: What are the key electrical parameters that define substitution eligibility?

A: Substitution eligibility is determined by matching technology (JFET N-Channel), frequency (400MHz), test voltage (15V), rated voltage (25V), current rating (10mA), and noise figure (4dB). All these parameters must be identical for valid substitution.

Q: Why is the MMBF5485 preferred despite being a different package type?

A: The MMBF5485 maintains active product status with substantially higher inventory availability, ensuring long-term supply chain reliability. The 2N5485 is obsolete with limited stock. For new production, the MMBF5485 is the sustainable choice when assembly capabilities support surface-mount technology.

Q: Are there moisture sensitivity or compliance differences between these parts?

A: No. Both devices maintain identical moisture sensitivity levels (MSL 1 - Unlimited) and REACH Unaffected status, ensuring equivalent environmental and regulatory compliance.

Q: What assembly process changes are required when switching from 2N5485 to MMBF5485?

A: The 2N5485 requires through-hole assembly with wave soldering or manual insertion. The MMBF5485 requires surface-mount assembly with reflow soldering. PCB layout and assembly equipment must be adapted accordingly.

Q: Can the MMBF5485 be used in high-frequency RF applications at 400MHz?

A: Yes. The MMBF5485 is specified for 400MHz operation with identical RF performance characteristics to the 2N5485, including 4dB noise figure and equivalent gain characteristics.