CMPF5485 TR Equivalent & Substitute Parts

Part Overview

The CMPF5485 TR is an N-Channel JFET transistor manufactured by Central Semiconductor Corp, designed for surface mount applications in the SOT-23 package. This device operates at a maximum breakdown voltage of 25 V with a maximum drain current of 30 mA and power dissipation of 350 mW. The part is currently active in production with 816 units in stock. Equivalent parts are identified based on matching electrical specifications and package compatibility to support procurement flexibility and supply chain continuity.

Substiute Parts

CMPF5485 TR

Central Semiconductor CorpIn Stock: 826CMPF5485 TR Datasheet

Current PartRFQ

MMBFJ108

onsemiIn Stock: 1197MMBFJ108 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CMPF5485 TR is determined by the following critical parameters:

• FET Type: N-Channel configuration must be maintained
• Voltage - Breakdown (V(BR)GSS): Minimum 25 V required
• Package / Case: SOT-23-3 surface mount package required for mechanical and thermal compatibility
• Power - Max: 350 mW dissipation capability required
• Mounting Type: Surface mount requirement

The MMBFJ108 from onsemi meets these substitution criteria. Both devices share identical breakdown voltage (25 V), identical maximum power dissipation (350 mW), identical package type (SOT-23-3), and identical mounting configuration (surface mount). The N-Channel JFET topology is preserved across both parts.

Parameter Comparison

Engineering Selection Recommendations

Both the CMPF5485 TR and MMBFJ108 are active production devices suitable for new designs. The MMBFJ108 offers ROHS3 compliance, which may be required for applications subject to RoHS regulations. The CMPF5485 TR supports a lower operating temperature minimum of -65°C compared to the MMBFJ108 at -55°C, making the CMPF5485 TR the appropriate choice for extended low-temperature applications. Selection between these parts should be based on regulatory compliance requirements and operating temperature range specifications of the target application.

Frequently Asked Questions (FAQ)

Q: Can the MMBFJ108 directly replace the CMPF5485 TR in existing designs?

A: Yes, the MMBFJ108 is mechanically and electrically compatible as a substitute. Both devices share identical breakdown voltage (25 V), maximum power dissipation (350 mW), and SOT-23-3 package configuration. Verify that the application does not require the extended low-temperature operating range of the CMPF5485 TR (-65°C minimum versus -55°C for the MMBFJ108).

Q: What are the key differences between these two parts?

A: The primary differences are: (1) Operating temperature minimum: CMPF5485 TR operates to -65°C while MMBFJ108 operates to -55°C; (2) RoHS compliance: MMBFJ108 is ROHS3 compliant while CMPF5485 TR is non-compliant; (3) Drain current (Idss): MMBFJ108 specifies 80 mA @ 15 V versus 4 mA @ 15 V for CMPF5485 TR; (4) Gate cutoff voltage: MMBFJ108 specifies 3 V @ 10 nA versus 500 mV @ 10 nA for CMPF5485 TR.

Q: Are both parts available in the same package?

A: Yes, both the CMPF5485 TR and MMBFJ108 are supplied in the SOT-23-3 surface mount package, ensuring identical PCB footprint and mounting compatibility.

Q: Which part should I select for RoHS-compliant applications?

A: The MMBFJ108 is ROHS3 compliant and is the appropriate selection for applications requiring RoHS compliance. The CMPF5485 TR is RoHS non-compliant.

Q: What is the inventory status of these parts?

A: CMPF5485 TR has 816 units in stock. MMBFJ108 has 1106 units in stock.