IRF644B-FP001 Equivalent & Substitute Parts

Part Overview

The IRF644B-FP001 is an N-Channel MOSFET manufactured by onsemi, rated for 250V drain-to-source voltage and 14A continuous drain current in a Through Hole TO-220-3 package. This device is classified as obsolete, necessitating identification of equivalent substitute components for ongoing design support and procurement requirements. The IRF644B-FP001 delivers 139W maximum power dissipation and operates across the temperature range of -55°C to 150°C (TJ).

Substiute Parts

IRF644B-FP001

onsemiIn Stock: 1017IRF644B-FP001 Datasheet

Current PartRFQ

IRF644PBF

Vishay SiliconixIn Stock: 3380IRF644PBF Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute components for the IRF644B-FP001 are identified based on electrical and mechanical parameter equivalence within the N-Channel MOSFET category. The substitution criteria are established by the following key parameters:

Electrical Equivalence Parameters:

• Drain to Source Voltage (Vdss): 250V
• Continuous Drain Current (Id) @ 25°C: 14A (Tc)
• Gate-Source Threshold Voltage (Vgs(th)): 4V @ 250µA
• On-State Drain Resistance (Rds On): 280mOhm @ 10V drive voltage
• Operating Temperature Range: -55°C to 150°C (TJ)

Mechanical Equivalence Parameters:

• Mounting Type: Through Hole
• Package Classification: TO-220-3 family

The IRF644PBF qualifies as a substitute based on matching electrical performance across all critical parameters and compatible Through Hole packaging. Both devices maintain identical Vdss, Id, Vgs(th), and operating temperature specifications. Minor variations in secondary parameters (Gate Charge, Input Capacitance, Power Dissipation) remain within acceptable tolerance for functional equivalence in standard switching applications.

Parameter Comparison

Engineering Selection Recommendations

IRF644PBF (Vishay Siliconix) - Primary Substitute

The IRF644PBF is the recommended substitute for the obsolete IRF644B-FP001. This component maintains electrical equivalence across all critical switching parameters: 250V Vdss, 14A continuous drain current, 4V gate-source threshold voltage, and 280mOhm on-state resistance at 10V drive voltage. Both devices operate across the identical temperature range (-55°C to 150°C TJ) and share Through Hole TO-220-3 package compatibility.

The IRF644PBF holds Active product status, ensuring long-term availability and supply chain continuity. Both components are ROHS3 Compliant and carry MSL 1 (Unlimited) moisture sensitivity classification, indicating equivalent environmental handling requirements.

Secondary parameter variations between the two devices are non-critical for standard switching applications. The IRF644PBF exhibits slightly lower gate charge (68 nC versus 60 nC) and input capacitance (1300 pF versus 1600 pF), resulting in marginally improved switching characteristics. The IRF644PBF maximum power dissipation rating of 125W is lower than the IRF644B-FP001 (139W); however, this difference does not restrict functional equivalence in applications where thermal management is properly designed.

The IRF644PBF maximum gate-source voltage rating is ±20V compared to ±30V for the IRF644B-FP001. Circuit designs must confirm that gate drive voltages do not exceed ±20V to ensure compatibility with the substitute component.

Frequently Asked Questions (FAQ)

Q: Can the IRF644PBF directly replace the IRF644B-FP001 in existing circuit designs?

A: The IRF644PBF is electrically equivalent to the IRF644B-FP001 across all primary switching parameters (Vdss, Id, Vgs(th), Rds On, and operating temperature range). Direct substitution is supported for standard switching applications. Circuit designs must confirm that gate drive voltages remain within the IRF644PBF maximum rating of ±20V.

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

A: The primary differences are product status (IRF644B-FP001 is obsolete; IRF644PBF is active), maximum gate-source voltage (±30V versus ±20V), power dissipation rating (139W versus 125W), and secondary parameters including gate charge and input capacitance. These differences do not affect functional equivalence in standard switching applications.

Q: Are the TO-220-3 packages mechanically identical?

A: Both the IRF644B-FP001 and IRF644PBF use Through Hole TO-220-3 package classification. The IRF644PBF is supplied in Tube packaging format, while the IRF644B-FP001 packaging format is not specified. Mechanical compatibility with printed circuit board layouts is maintained.

Q: What compliance certifications apply to both components?

A: Both the IRF644B-FP001 and IRF644PBF are ROHS3 Compliant and carry MSL 1 (Unlimited) moisture sensitivity classification. The IRF644B-FP001 is REACH Unaffected; the IRF644PBF is REACH Affected. Both components are classified under ECCN EAR99 and HTSUS 8541.29.0095.

Q: Why is the IRF644B-FP001 classified as obsolete?

A: The IRF644B-FP001 is listed as obsolete by the manufacturer. The IRF644PBF, manufactured by Vishay Siliconix, is the active equivalent component and is recommended for new designs and ongoing procurement requirements.

Q: Are there inventory considerations when selecting between these components?

A: The IRF644B-FP001 has 957 pieces in stock (new original). The IRF644PBF has 3281 pieces in stock (new original), providing greater availability and supply chain security for ongoing production requirements.