NTJS3157NT4G N-Channel MOSFET Equivalent & Substitute Parts

Part Overview

The NTJS3157NT4G is an N-Channel MOSFET manufactured by onsemi, rated for 20V drain-to-source voltage with 3.2A continuous drain current. The device is housed in a 6-TSSOP/SC-88/SOT-363 surface mount package and dissipates up to 1W at ambient temperature. This part is classified as obsolete, making identification of equivalent and substitute components necessary for ongoing design support and procurement continuity. Active alternatives with identical or compatible electrical and mechanical specifications are available from onsemi and other manufacturers.

Substiute Parts

NTJS3157NT4G

onsemiIn Stock: 799NTJS3157NT4G Datasheet

Current PartRFQ

NTJS3157NT1G

onsemiIn Stock: 1647NTJS3157NT1G Datasheet

DirectRFQ

NTJS3157NT2G

onsemiIn Stock: 794NTJS3157NT2G Datasheet

Parametric EquivalentRFQ

AO7408

Alpha & Omega Semiconductor Inc.In Stock: 4262AO7408 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the NTJS3157NT4G is determined by electrical and mechanical parameter compatibility within the N-Channel MOSFET category. The critical parameters governing substitution are:

Electrical Compatibility Criteria:

• Drain-to-source voltage rating (Vdss) must equal or exceed 20V
• Continuous drain current (Id) must equal or exceed 3.2A at 25°C
• On-resistance (Rds On) must not exceed 60mOhm at specified gate voltage
• Gate threshold voltage (Vgs(th)) must be compatible with 1V @ 250µA
• Maximum gate voltage (Vgs) must accommodate ±8V operation
• Operating temperature range must span -55°C to 150°C

Mechanical Compatibility Criteria:

• Package type must be 6-TSSOP, SC-88, or SOT-363 surface mount
• Moisture sensitivity level must be MSL 1 or equivalent
• Pin configuration must be compatible with SC-88/SC70-6 footprint

Substitution Categories:

Direct Equivalent: NTJS3157NT1G meets all electrical and mechanical parameters identically. This part is an active product from onsemi with identical specifications and packaging.

Parametric Equivalent: NTJS3157NT2G meets all electrical and mechanical parameters identically. This part is an active product from onsemi with identical specifications and packaging.

Similar Substitute: AO7408 from Alpha & Omega Semiconductor Inc. meets voltage and package requirements but operates at reduced continuous drain current (2A versus 3.2A) and power dissipation (350mW versus 1W). This part is suitable for applications where the lower current rating is acceptable.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications):

NTJS3157NT1G and NTJS3157NT2G are both active products from onsemi that provide complete electrical and mechanical equivalence to the obsolete NTJS3157NT4G. Both parts maintain the 3.2A continuous drain current, 60mOhm on-resistance, and 1W power dissipation. NTJS3157NT1G is available in Cut Tape and Digi-Reel packaging with ROHS3 compliance. NTJS3157NT2G is also ROHS3 compliant. Both parts are suitable for direct substitution in existing designs without circuit modification.

For Current-Limited Applications:

AO7408 from Alpha & Omega Semiconductor Inc. operates at 2A continuous drain current and 350mW power dissipation, representing a 37.5% reduction in current handling and 65% reduction in power dissipation compared to the main part. This device is suitable only for applications where the lower current and power ratings are acceptable. The AO7408 maintains the same 20V voltage rating, ±8V gate voltage range, and -55°C to 150°C operating temperature. Gate charge is significantly lower at 4nC, and input capacitance is reduced to 320pF.

Compliance and Regulatory Status:

All substitute parts carry REACH Unaffected status and ROHS3 compliance (where specified), ensuring regulatory compatibility with current environmental and safety standards. MSL 1 rating across all parts indicates unlimited shelf life under controlled storage conditions.

Frequently Asked Questions (FAQ)

Q: Can NTJS3157NT1G be used as a direct replacement for NTJS3157NT4G?

A: Yes. NTJS3157NT1G is a direct equivalent with identical electrical specifications (20V, 3.2A, 60mOhm Rds On, 1W power dissipation) and identical package configuration (6-TSSOP/SC-88/SOT-363). The part is active and ROHS3 compliant.

Q: What is the difference between NTJS3157NT1G and NTJS3157NT2G?

A: Both parts are parametric equivalents with identical electrical and mechanical specifications. The difference lies in packaging and distribution channels. NTJS3157NT1G is available in Cut Tape and Digi-Reel formats, while NTJS3157NT2G packaging details are not specified. Both are active onsemi products suitable for direct substitution.

Q: Can AO7408 replace NTJS3157NT4G in all applications?

A: AO7408 is a similar substitute suitable only for applications where the reduced current rating (2A versus 3.2A) and power dissipation (350mW versus 1W) are acceptable. The device maintains the same 20V voltage rating and operating temperature range. Applications requiring the full 3.2A continuous current must use NTJS3157NT1G or NTJS3157NT2G.

Q: Are all substitute parts compatible with the same PCB footprint?

A: Yes. All substitute parts use the 6-TSSOP/SC-88/SOT-363 surface mount package, ensuring mechanical and electrical compatibility with existing PCB layouts designed for NTJS3157NT4G.

Q: What is the MSL rating for these parts?

A: All parts carry MSL 1 (Unlimited) rating, indicating unlimited shelf life under controlled storage conditions (per IPC-A-610 standards). No special moisture bake-out procedures are required prior to assembly.

Q: Are there differences in gate charge between the substitute parts?

A: NTJS3157NT1G and NTJS3157NT2G maintain identical gate charge of 15nC at 4.5V. AO7408 has significantly lower gate charge at 4nC, which may affect gate drive circuit design and switching speed characteristics in high-frequency applications.

Q: What is the REACH and RoHS compliance status?

A: All parts are REACH Unaffected. NTJS3157NT1G and NTJS3157NT2G are ROHS3 compliant. RoHS status for NTJS3157NT4G is not specified in available documentation.