IRF730STRLPBF Equivalent & Substitute Parts

Part Overview

The IRF730STRLPBF is an N-Channel MOSFET manufactured by Vishay Siliconix, rated for 400V drain-to-source voltage with 5.5A continuous drain current at 25°C. The device is housed in a Surface Mount TO-263 (D2PAK) package and is designed for applications requiring moderate voltage and current switching capabilities. The part maintains Active product status and is RoHS3 compliant with unlimited moisture sensitivity rating (MSL 1).

Substitute parts are identified when equivalent electrical performance can be achieved within the specified parameter ranges while maintaining the same package type and thermal characteristics. Alternative devices may be required due to inventory availability, supply chain considerations, or design optimization for enhanced performance margins.

Substiute Parts

IRF730STRLPBF

Vishay SiliconixIn Stock: 851IRF730STRLPBF Datasheet

Current PartRFQ

STB11NK40ZT4

STMicroelectronicsIn Stock: 2395STB11NK40ZT4 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the IRF730STRLPBF are identified based on strict electrical and mechanical compatibility criteria. The primary substitution logic is based on the following parameters:

Voltage Rating Compatibility: The substitute part must maintain the same 400V Drain-to-Source Voltage (Vdss) rating to ensure safe operation in the target application circuit.

Package Compatibility: The substitute part must use the same TO-263 (D2PAK) Surface Mount package to ensure mechanical and thermal interface compatibility with the printed circuit board layout and thermal management design.

Operating Temperature Range: The substitute part must support the full operating temperature range of -55°C to 150°C (TJ) to maintain performance across all environmental conditions.

Gate Voltage Compatibility: The substitute part must operate within compatible gate voltage ranges (Vgs) to ensure proper drive circuit integration.

Compliance Requirements: The substitute part must maintain RoHS3 compliance and MSL 1 rating to meet regulatory and manufacturing process requirements.

The STB11NK40ZT4 meets all these criteria. While it offers enhanced continuous drain current (9A versus 5.5A) and improved power dissipation characteristics (110W Tc versus 74W Tc), it maintains full electrical and mechanical compatibility with the IRF730STRLPBF within the specified parameter envelope.

Parameter Comparison

Engineering Selection Recommendations

IRF730STRLPBF Selection Criteria:

The IRF730STRLPBF is appropriate for applications where the specified 5.5A continuous drain current and 1Ohm on-resistance characteristics are sufficient for the circuit design. This part is suitable for designs with established thermal management and gate drive circuits optimized for the device's electrical parameters. The part maintains Active product status with established supply availability.

STB11NK40ZT4 Selection Criteria:

The STB11NK40ZT4 is suitable for applications requiring enhanced current handling capability (9A continuous drain current) or improved thermal performance (110W Tc power dissipation). The lower on-resistance (550mOhm at 4.5A, 10V) reduces conduction losses in switching applications. The STB11NK40ZT4 features SuperMESH™ technology and maintains Active product status with higher inventory availability (2285 pieces in stock versus 784 pieces for the IRF730STRLPBF).

Compliance and Regulatory Considerations:

Both parts maintain RoHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, meeting current regulatory requirements for electronic component manufacturing and assembly. Both parts carry EAR99 export classification and identical HTSUS tariff codes (8541.29.0095), indicating equivalent regulatory treatment.

Thermal Management:

The STB11NK40ZT4 offers superior thermal performance with 110W maximum power dissipation at case temperature versus 74W for the IRF730STRLPBF. Both devices operate across the full -55°C to 150°C temperature range and use identical TO-263 (D2PAK) package thermal interfaces.

Frequently Asked Questions (FAQ)

Q: Can the STB11NK40ZT4 be used as a direct replacement for the IRF730STRLPBF?

A: Yes. Both devices share identical 400V Vdss rating, TO-263 (D2PAK) package type, operating temperature range (-55°C to 150°C), and compliance certifications (RoHS3, MSL 1). The STB11NK40ZT4 provides enhanced performance characteristics including higher continuous drain current (9A versus 5.5A) and improved power dissipation capability (110W Tc versus 74W Tc).

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

A: The primary differences are continuous drain current rating (5.5A for IRF730STRLPBF versus 9A for STB11NK40ZT4), on-resistance (1Ohm at 3.3A for IRF730STRLPBF versus 550mOhm at 4.5A for STB11NK40ZT4), and maximum power dissipation (74W Tc for IRF730STRLPBF versus 110W Tc for STB11NK40ZT4). Both maintain the same 400V voltage rating and 10V drive voltage specification.

Q: Are there any gate drive circuit modifications required when substituting the STB11NK40ZT4 for the IRF730STRLPBF?

A: No modifications are required. Both devices operate with 10V drive voltage and maintain compatible gate threshold voltage specifications (4V for IRF730STRLPBF at 250µA versus 4.5V for STB11NK40ZT4 at 100µA). The STB11NK40ZT4 features a higher maximum gate voltage rating (±30V versus ±20V), providing additional design margin.

Q: Do these parts require different PCB layout considerations?

A: No. Both devices use the identical TO-263 (D2PAK) Surface Mount package with the same pinout and thermal interface characteristics. PCB layouts designed for the IRF730STRLPBF are directly compatible with the STB11NK40ZT4 without modification.

Q: What is the impact of the higher input capacitance (Ciss) of the STB11NK40ZT4?

A: The STB11NK40ZT4 has higher input capacitance (930pF at 25V versus 700pF for IRF730STRLPBF). This results in slightly higher gate charge requirements (32nC for STB11NK40ZT4 versus 38nC for IRF730STRLPBF) but does not affect circuit compatibility. Gate drive circuits designed for the IRF730STRLPBF will operate correctly with the STB11NK40ZT4.

Q: Are both parts available in the same packaging options?

A: The IRF730STRLPBF is supplied in Tape & Reel (TR) packaging, while the STB11NK40ZT4 is available in Cut Tape (CT) and Digi-Reel® packaging. Both use the TO-263 (D2PAK) component package. Packaging format selection depends on assembly process requirements and volume considerations.

Q: Do these parts have different moisture sensitivity or storage requirements?

A: No. Both parts carry MSL 1 (Unlimited) moisture sensitivity rating, indicating no special moisture control requirements during storage or handling. Both parts meet identical moisture sensitivity specifications.

Q: What is the temperature operating range for both devices?

A: Both the IRF730STRLPBF and STB11NK40ZT4 operate across the full -55°C to 150°C junction temperature (TJ) range, providing identical thermal performance envelope for application design.