IRF644STRL Equivalent & Substitute Parts

Part Overview

The IRF644STRL is an N-Channel MOSFET manufactured by Vishay Siliconix, rated for 250V drain-to-source voltage and 14A continuous drain current in a surface mount TO-263 (D2PAK) package. This device is classified as obsolete, which necessitates identification of active equivalent alternatives for new designs and ongoing production requirements. Substitute parts must maintain identical electrical characteristics and mechanical compatibility to ensure direct replacement without circuit redesign.

Substiute Parts

IRF644STRL

Vishay SiliconixIn Stock: 4311IRF644STRL Datasheet

Current PartRFQ

IRF644STRLPBF

Vishay SiliconixIn Stock: 1698IRF644STRLPBF Datasheet

Parametric EquivalentRFQ

IRF644STRRPBF

Vishay SiliconixIn Stock: 1858IRF644STRRPBF Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the IRF644STRL are identified based on strict electrical and mechanical parameter equivalence. All substitute candidates must satisfy the following criteria:

Electrical Equivalence Requirements:

• Drain to Source Voltage (Vdss): 250V
• Continuous Drain Current (Id) @ 25°C: 14A (Tc)
• On-State Resistance (Rds On): 280 mOhm @ 8.4A, 10V
• Gate Threshold Voltage (Vgs(th)): 4V @ 250µA
• Gate Charge (Qg): 68 nC @ 10V
• Maximum Gate Voltage (Vgs): ±20V
• Input Capacitance (Ciss): 1300 pF @ 25V
• Power Dissipation: 3.1W (Ta), 125W (Tc)
• Operating Temperature Range: -55°C to 150°C (TJ)

Mechanical Compatibility Requirements:

• Mounting Type: Surface Mount
• Package: TO-263 (D2PAK)
• Moisture Sensitivity Level: 1 (Unlimited)

The IRF644STRL base product number IRF644 is shared across all substitute variants, confirming die-level equivalence. Differences between variants are limited to packaging format (bulk versus tape & reel) and compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

IRF644STRLPBF and IRF644STRRPBF are direct electrical and mechanical equivalents to the IRF644STRL. Both substitute parts are classified as active products, ensuring long-term availability and supply chain continuity. The primary distinction between the two substitutes is packaging format: IRF644STRLPBF and IRF644STRRPBF are supplied in tape & reel format, suitable for automated assembly processes.

Both substitute parts achieve ROHS3 compliance, addressing regulatory requirements that the original IRF644STRL does not satisfy. This compliance upgrade is significant for applications subject to RoHS directives in the European Union and equivalent jurisdictions.

Selection between IRF644STRLPBF and IRF644STRRPBF should be based on supply availability and procurement requirements. Both parts maintain identical electrical performance and thermal characteristics. Current inventory levels are 1590 units for IRF644STRLPBF and 1764 units for IRF644STRRPBF.

Frequently Asked Questions (FAQ)

Q: Can IRF644STRLPBF or IRF644STRRPBF be used as direct replacements for IRF644STRL?

A: Yes. Both substitute parts are electrically and mechanically identical to the IRF644STRL. All critical parameters including Vdss, Id, Rds On, gate charge, and operating temperature range are matched. The TO-263 (D2PAK) package pinout and thermal characteristics are identical, enabling direct PCB-level substitution without circuit modification.

Q: What is the difference between IRF644STRLPBF and IRF644STRRPBF?

A: Both parts are electrically identical. The difference is in packaging format: IRF644STRLPBF and IRF644STRRPBF are supplied in tape & reel format for automated pick-and-place assembly. The original IRF644STRL is supplied in bulk packaging. All three variants share the same die and electrical specifications.

Q: Why is the IRF644STRL classified as obsolete?

A: The IRF644STRL is listed as obsolete by the manufacturer. IRF644STRLPBF and IRF644STRRPBF are active products that supersede the original part. For new designs and ongoing production, active equivalents should be specified to ensure continued availability and support.

Q: Are there RoHS compliance differences between the main part and substitutes?

A: Yes. The IRF644STRL is RoHS non-compliant, while both IRF644STRLPBF and IRF644STRRPBF are ROHS3 compliant. This compliance upgrade is beneficial for applications subject to RoHS directives. Electrical performance and thermal characteristics remain unchanged.

Q: What is the moisture sensitivity level for these parts?

A: All three variants—IRF644STRL, IRF644STRLPBF, and IRF644STRRPBF—have a Moisture Sensitivity Level (MSL) of 1 (Unlimited). This indicates no moisture sensitivity restrictions and no special storage or handling requirements.

Q: Can these parts be used in high-temperature applications?

A: Yes. All variants operate across the temperature range of -55°C to 150°C (TJ). The maximum junction temperature of 150°C supports high-temperature industrial and automotive applications. Thermal management through adequate PCB copper area and heat sinking is required to maintain junction temperature within specified limits.

Q: What is the gate charge specification, and why is it important?

A: Gate charge (Qg) is specified as 68 nC @ 10V. This parameter determines the switching speed and gate drive requirements. Lower gate charge enables faster switching and reduces gate driver power dissipation. This specification is identical across all three variants.

Q: Are these parts suitable for automated assembly?

A: IRF644STRLPBF and IRF644STRRPBF are supplied in tape & reel format, which is standard for automated surface mount assembly. The IRF644STRL bulk packaging is less suitable for high-volume automated processes. For production environments, IRF644STRLPBF or IRF644STRRPBF are recommended.