STB40N20 N-Channel MOSFET 200V 40A Equivalent & Substitute Parts

Part Overview

The STB40N20 is an N-Channel MOSFET manufactured by STMicroelectronics, rated for 200V drain-to-source voltage and 40A continuous drain current in a D2PAK surface mount package. This device is classified as obsolete, necessitating identification of equivalent and substitute components for ongoing design support and procurement continuity. The STripFET™ series technology provides efficient switching performance in power conversion applications.

Substiute Parts

STB40N20

STMicroelectronicsIn Stock: 3099STB40N20 Datasheet

Current PartRFQ

STB40NF20

STMicroelectronicsIn Stock: 1286STB40NF20 Datasheet

DirectRFQ

PSMN057-200B,118

Nexperia USA Inc.In Stock: 11240PSMN057-200B,118 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the STB40N20 is determined by electrical and mechanical compatibility across the following critical parameters:

Primary Substitution Criteria:

• Drain-to-Source Voltage (Vdss): 200V minimum
• Continuous Drain Current (Id): 40A or greater at 25°C
• Package Type: D2PAK (TO-263-3) surface mount configuration
• Gate Threshold Voltage (Vgs(th)): 4V maximum
• Maximum Gate Voltage (Vgs): ±20V
• RoHS3 Compliance and MSL Level 1 rating

Substitution Categories:

Direct Equivalent: STB40NF20 (STMicroelectronics) — Identical electrical specifications with active product status and alternative packaging options (Cut Tape & Digi-Reel®).

Functional Equivalent: PSMN057-200B,118 (Nexperia USA Inc.) — Meets voltage and package requirements with comparable drain current (39A) and enhanced power dissipation capability (250W). Operates across extended temperature range (-55°C to 175°C).

Parameter Comparison

Engineering Selection Recommendations

STB40NF20 Selection: The STB40NF20 is the primary direct equivalent for STB40N20 replacement. This part maintains identical electrical specifications and D2PAK packaging while offering active product status and improved supply availability. The STB40NF20 is available in Cut Tape and Digi-Reel® packaging formats, providing flexibility for both prototype and production procurement. Both devices comply with ROHS3 standards and carry MSL Level 1 moisture sensitivity ratings.

PSMN057-200B,118 Selection: The PSMN057-200B,118 serves as a functional equivalent for applications where enhanced thermal performance is beneficial. This Nexperia device provides 250W maximum power dissipation compared to 160W for the STB40N20, and extends the operating temperature range to 175°C. The continuous drain current specification of 39A meets the 40A requirement within acceptable tolerance for most switching applications. The higher gate charge (96 nC) and input capacitance (3750 pF) require verification against gate driver capabilities in existing circuit designs. This part is actively manufactured and maintains full ROHS3 and MSL Level 1 compliance.

Compliance Considerations: All three devices are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with HTSUS code 8541.29.0095. MSL Level 1 rating indicates unlimited shelf life under controlled storage conditions.

Frequently Asked Questions (FAQ)

Q: Can STB40NF20 be used as a direct replacement for STB40N20?

A: Yes. The STB40NF20 provides identical electrical specifications including 200V Vdss, 40A continuous drain current, 45mOhm Rds On, and D2PAK packaging. The primary difference is product status (active versus obsolete) and packaging format options. Pin configuration and electrical performance are equivalent.

Q: What are the key differences between STB40N20 and PSMN057-200B,118?

A: Both devices share 200V Vdss and D2PAK packaging. The PSMN057-200B,118 provides 39A continuous drain current (versus 40A), higher power dissipation (250W versus 160W), extended temperature range (-55°C to 175°C versus -55°C to 150°C), and higher gate charge (96 nC versus 75 nC). On-state resistance differs at different measurement points: 57 mOhm @ 17A for PSMN057 versus 45 mOhm @ 20A for STB40N20.

Q: Is the PSMN057-200B,118 suitable for high-temperature applications?

A: The PSMN057-200B,118 operates to 175°C junction temperature, compared to 150°C for the STB40N20. This extended range supports applications requiring higher thermal margins. However, gate driver circuit compatibility must be verified, as the higher gate charge (96 nC) may require different drive timing compared to the original 75 nC specification.

Q: Are all three devices available in the same packaging?

A: Yes. All three devices use D2PAK (TO-263-3) surface mount packaging with 2 leads plus tab configuration. Mechanical compatibility is confirmed across all three parts. Packaging format availability differs: STB40N20 and PSMN057-200B,118 are supplied in Tape & Reel format, while STB40NF20 is available in Cut Tape and Digi-Reel® options.

Q: What is the impact of higher gate charge in the PSMN057-200B,118?

A: The PSMN057-200B,118 specifies 96 nC gate charge at 10V compared to 75 nC for STB40N20. This 28% increase requires verification that existing gate driver circuits can supply adequate charge within required switching time windows. Higher gate charge typically results in longer switching transitions and increased switching losses if driver capability is insufficient.

Q: Are all three devices RoHS3 compliant?

A: Yes. STB40N20, STB40NF20, and PSMN057-200B,118 are all ROHS3 compliant with MSL Level 1 moisture sensitivity ratings. All three are REACH unaffected and classified under ECCN EAR99.

Q: Which part should be selected for new designs?

A: For new designs, STB40NF20 or PSMN057-200B,118 are recommended as both maintain active product status. STB40NF20 provides exact electrical equivalence to the original STB40N20 specification. PSMN057-200B,118 offers enhanced thermal performance and extended temperature range for applications requiring these characteristics.