IRFS644B_FP001 Equivalent & Substitute Parts

Part Overview

The IRFS644B_FP001 is an N-Channel MOSFET manufactured by onsemi, rated for 250V drain-to-source voltage with 14A continuous drain current at 25°C. This device is packaged in a Through Hole TO-220F-3 configuration and is designed for general-purpose switching applications requiring moderate power dissipation up to 43W. The IRFS644B_FP001 is classified as obsolete, making identification of equivalent substitute components necessary for ongoing design support and procurement continuity.

Substiute Parts

IRFS644B_FP001

onsemiIn Stock: 709IRFS644B_FP001 Datasheet

Current PartRFQ

STF16NF25

STMicroelectronicsIn Stock: 15666STF16NF25 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the IRFS644B_FP001 is determined by strict equivalence across the following critical electrical and mechanical parameters:

Electrical Equivalence Criteria:

• FET Type: N-Channel topology
• Drain to Source Voltage (Vdss): 250V minimum rating
• Continuous Drain Current (Id): 14A minimum at 25°C
• Gate Threshold Voltage (Vgs(th)): 4V maximum at 250µA
• Drive Voltage: 10V gate drive compatibility
• Operating Temperature Range: -55°C to 150°C minimum

Mechanical Equivalence Criteria:

• Mounting Type: Through Hole configuration
• Package: TO-220-3 Full Pack footprint compatibility

The STF16NF25 manufactured by STMicroelectronics meets all specified electrical and mechanical parameters for direct substitution with the IRFS644B_FP001. Both devices share identical voltage and current ratings, compatible gate threshold specifications, and identical thermal operating ranges. The TO-220FP package of the STF16NF25 is mechanically compatible with the TO-220F-3 footprint of the IRFS644B_FP001.

Parameter Comparison

Engineering Selection Recommendations

The STF16NF25 is a direct functional substitute for the obsolete IRFS644B_FP001. Both devices are rated for identical voltage and current specifications and operate across the same temperature range. The STF16NF25 maintains active product status with full manufacturer support, ensuring long-term availability and supply chain continuity.

The STF16NF25 demonstrates improved electrical performance characteristics compared to the IRFS644B_FP001. The on-resistance (Rds On) is lower at 235mOhm versus 280mOhm, resulting in reduced conduction losses. Gate charge is significantly reduced at 18nC versus 60nC, enabling faster switching transitions and lower gate drive power requirements. Input capacitance is reduced from 1600pF to 680pF, further improving switching performance.

Both devices carry REACH Unaffected status and Moisture Sensitivity Level 1 (Unlimited), indicating equivalent environmental compliance and handling requirements. The STF16NF25 is RoHS3 Compliant, confirming adherence to current regulatory standards.

The TO-220FP package of the STF16NF25 is mechanically and electrically compatible with the TO-220F-3 footprint of the IRFS644B_FP001, permitting direct board-level substitution without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can the STF16NF25 be used as a direct replacement for the IRFS644B_FP001 in existing designs?

A: Yes. The STF16NF25 meets all electrical specifications of the IRFS644B_FP001, including voltage rating (250V), continuous drain current (14A), gate threshold voltage (4V), and operating temperature range (-55°C to 150°C). The TO-220FP package is mechanically compatible with the TO-220F-3 footprint, permitting direct substitution without circuit board modifications.

Q: What are the performance differences between these two devices?

A: The STF16NF25 exhibits superior electrical characteristics. On-resistance is reduced from 280mOhm to 235mOhm, decreasing conduction losses. Gate charge is reduced from 60nC to 18nC, enabling faster switching and lower gate drive power. Input capacitance is reduced from 1600pF to 680pF. Power dissipation rating differs at 25W for the STF16NF25 versus 43W for the IRFS644B_FP001; however, the lower on-resistance of the STF16NF25 typically results in lower actual power dissipation in operation.

Q: Are there any gate voltage differences between these devices?

A: The maximum gate voltage (Vgs Max) differs between the two devices. The IRFS644B_FP001 is rated for ±30V, while the STF16NF25 is rated for ±20V. Both devices share identical gate threshold voltage specifications (4V @ 250µA) and are driven at 10V, which is within the operating range of both devices.

Q: What is the availability status of each device?

A: The IRFS644B_FP001 is classified as obsolete with limited inventory (615 pieces). The STF16NF25 is an active product with substantial inventory availability (15,599 pieces), ensuring reliable long-term procurement and supply chain continuity.

Q: Are there any compliance or environmental differences?

A: Both devices carry REACH Unaffected status and Moisture Sensitivity Level 1 (Unlimited), indicating equivalent environmental compliance. The STF16NF25 is RoHS3 Compliant, confirming adherence to current regulatory standards. Both devices carry EAR99 ECCN classification and identical HTSUS codes.

Q: What packaging format is supplied for each device?

A: The IRFS644B_FP001 is supplied in standard packaging. The STF16NF25 is supplied in Tube packaging. Both devices use the TO-220-3 Full Pack case style with identical pin configurations and footprints.