STB70NFS03LT4 Equivalent & Substitute Parts

Part Overview

The STB70NFS03LT4 is an N-Channel MOSFET manufactured by STMicroelectronics, rated for 30V drain-to-source voltage and 70A continuous drain current in a D2PAK surface mount package. This device is part of the STripFET™ series and is classified as obsolete. Due to its obsolete status, equivalent and substitute parts from active product lines are necessary to maintain design continuity and ensure long-term component availability for new designs and production requirements.

Substiute Parts

STB70NFS03LT4

STMicroelectronicsIn Stock: 2404STB70NFS03LT4 Datasheet

Current PartRFQ

STB70NF03LT4

STMicroelectronicsIn Stock: 25184STB70NF03LT4 Datasheet

Parametric EquivalentRFQ

PSMN017-30BL,118

Nexperia USA Inc.In Stock: 2850PSMN017-30BL,118 Datasheet

SimilarRFQ

PSMN4R3-30BL,118

Nexperia USA Inc.In Stock: 10797PSMN4R3-30BL,118 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the STB70NFS03LT4 is determined by the following critical parameters: drain-to-source voltage rating (Vdss), continuous drain current capability (Id), on-state resistance (Rds On), power dissipation rating, gate charge characteristics, operating temperature range, and package compatibility. All substitute parts must maintain the same D2PAK surface mount package configuration and meet or exceed the electrical performance specifications of the original device.

The substitute parts are grouped into two categories:

Parametric Equivalent: Parts that match all critical electrical specifications and are direct functional replacements.

Similar Parts: Parts that share the same voltage rating and package but differ in current rating, on-state resistance, or power dissipation characteristics. These parts are suitable for applications where the electrical performance parameters align with design requirements.

Parameter Comparison

Engineering Selection Recommendations

STB70NF03LT4 (STMicroelectronics): This part is the primary recommended substitute for the obsolete STB70NFS03LT4. It is an active product from the STripFET™ II series with identical electrical specifications, including 70A continuous drain current, 9.5 mOhm on-state resistance, and 100W power dissipation. The part maintains full compatibility with the original design and is ROHS3 compliant with REACH unaffected status. Inventory availability is significantly higher (25,100 pieces) compared to the original part.

PSMN4R3-30BL,118 (Nexperia USA Inc.): This part is suitable for applications requiring higher current capability. It provides 100A continuous drain current with superior on-state resistance (4.1 mOhm @ 15A, 10V) and 103W power dissipation. This device is an active product with robust inventory (10,750 pieces). It is appropriate for designs where increased current headroom or lower conduction losses are beneficial. ROHS3 compliance and REACH unaffected status are maintained.

PSMN017-30BL,118 (Nexperia USA Inc.): This part is classified as obsolete and is not recommended for new designs. While it shares the same 30V voltage rating and D2PAK package, it provides only 32A continuous drain current with higher on-state resistance (17 mOhm @ 10A, 10V) and reduced power dissipation (47W). This part is suitable only for legacy system maintenance where the lower current rating is acceptable.

Frequently Asked Questions (FAQ)

Q: Can the STB70NF03LT4 be used as a direct replacement for the STB70NFS03LT4?

A: Yes. The STB70NF03LT4 is a parametric equivalent with identical electrical specifications. Both devices are rated for 30V, 70A continuous drain current, 9.5 mOhm on-state resistance, and 100W power dissipation. The primary difference is product status: the original is obsolete while the substitute is active. No circuit modifications are required.

Q: What are the key differences between the STB70NF03LT4 and PSMN4R3-30BL,118?

A: Both parts share the same 30V voltage rating and D2PAK package. The PSMN4R3-30BL,118 provides higher current capability (100A versus 70A) and lower on-state resistance (4.1 mOhm versus 9.5 mOhm). Gate charge is higher (41.5 nC versus 30 nC). The PSMN4R3-30BL,118 is suitable for applications requiring increased current capacity or lower conduction losses.

Q: Is the PSMN017-30BL,118 suitable for replacing the STB70NFS03LT4?

A: No. While the PSMN017-30BL,118 shares the same 30V voltage rating and D2PAK package, it provides only 32A continuous drain current compared to the required 70A. This part is also obsolete. It is not suitable for direct replacement in designs requiring 70A capability.

Q: Are all substitute parts available in the same D2PAK package?

A: Yes. All substitute parts listed are available in the D2PAK (TO-263-3) surface mount package with identical pinout and thermal characteristics. No PCB layout modifications are required.

Q: What is the inventory status of available substitutes?

A: The STB70NF03LT4 has the highest inventory availability (25,100 pieces). The PSMN4R3-30BL,118 has 10,750 pieces in stock. The PSMN017-30BL,118 has 2,767 pieces but is obsolete. The original STB70NFS03LT4 has 2,300 pieces remaining.

Q: Do all substitute parts meet RoHS and REACH compliance requirements?

A: Yes. All substitute parts are ROHS3 compliant and REACH unaffected, matching the compliance status of the original STB70NFS03LT4.

Q: What is the operating temperature range for all substitute parts?

A: All substitute parts operate across the same temperature range: -55°C to 175°C (junction temperature). This matches the original device specification.