NDS8947 MOSFET Equivalent & Substitute Parts

Part Overview

The NDS8947 is a dual P-channel MOSFET array manufactured by onsemi, designed for surface mount applications in 8-SOIC packaging. This device features a 30V drain-to-source voltage rating with 4A continuous drain current capability and 900mW maximum power dissipation. The NDS8947 operates across an extended temperature range of -55°C to 150°C and incorporates logic level gate drive characteristics for direct microcontroller interfacing.

The NDS8947 is classified as an obsolete product. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support legacy system maintenance and production requirements.

Substiute Parts

NDS8947

onsemiIn Stock: 3296NDS8947 Datasheet

Current PartRFQ

FDS4935BZ

onsemiIn Stock: 27253FDS4935BZ Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the NDS8947 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

• Configuration: 2 P-Channel (Dual) MOSFET array
• Drain to Source Voltage (Vdss): 30V minimum
• Package / Case: 8-SOIC form factor with 0.154" (3.90mm) width
• Mounting Type: Surface Mount
• Operating Temperature Range: -55°C to 150°C (TJ)
• FET Feature: Logic Level Gate

Functional Compatibility Parameters:

• Maximum Power Dissipation: 900mW
• Continuous Drain Current (Id): Equal to or greater than 4A @ 25°C
• On-Resistance (Rds On): Equal to or lower than 65mOhm @ specified conditions

The FDS4935BZ qualifies as a direct substitute based on matching all critical parameters. The substitute part maintains identical voltage rating, package configuration, and temperature range while providing enhanced electrical performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

The FDS4935BZ is a qualified substitute for the NDS8947 based on the following engineering criteria:

Electrical Compatibility: Both devices share identical voltage ratings (30V Vdss) and operating temperature ranges (-55°C to 150°C). The FDS4935BZ provides superior continuous drain current capability (6.9A versus 4A), lower on-resistance (22mOhm versus 65mOhm), and equivalent maximum power dissipation (900mW). These characteristics ensure the substitute part meets or exceeds the electrical requirements of the original design.

Mechanical and Package Compatibility: Both parts utilize identical 8-SOIC surface mount packaging with 0.154" (3.90mm) width. Pin configuration and footprint are directly compatible, enabling drop-in replacement without PCB redesign.

Product Status and Supply: The FDS4935BZ holds Active product status with 27,189 pieces in current inventory, compared to the NDS8947's Obsolete status. The substitute part is manufactured by the same supplier (onsemi) and is RoHS3 Compliant, supporting long-term design sustainability and regulatory compliance.

Compliance and Certifications: Both parts carry identical REACH Unaffected status and EAR99 ECCN classification. Moisture Sensitivity Level (MSL) is 1 (Unlimited) for both devices, indicating no special handling requirements.

Frequently Asked Questions (FAQ)

Q: Can the FDS4935BZ be used as a direct replacement for the NDS8947 without circuit modifications?

A: Yes. The FDS4935BZ is a direct substitute. Both devices feature identical 8-SOIC packaging, 30V voltage rating, logic level gate drive, and -55°C to 150°C operating temperature range. Pin-to-pin compatibility and electrical characteristics support drop-in replacement without PCB or schematic changes.

Q: What are the key differences between the NDS8947 and FDS4935BZ?

A: The primary differences are product status and electrical performance. The FDS4935BZ is an Active product with higher continuous drain current (6.9A versus 4A) and significantly lower on-resistance (22mOhm versus 65mOhm). These enhancements provide improved thermal performance and reduced power dissipation in switching applications. The FDS4935BZ also incorporates PowerTrench® technology and is RoHS3 Compliant.

Q: Are there any thermal or reliability concerns when substituting the FDS4935BZ for the NDS8947?

A: No thermal or reliability concerns exist. The FDS4935BZ's lower on-resistance (22mOhm versus 65mOhm) results in reduced power dissipation during operation, which improves thermal performance compared to the original part. Both devices share identical maximum power ratings (900mW) and operating temperature ranges.

Q: Does the FDS4935BZ require different gate drive circuitry?

A: No. Both devices feature Logic Level Gate drive characteristics with similar threshold voltage specifications (Vgs(th) of 2.8V for NDS8947 and 3V for FDS4935BZ). Existing gate drive circuits designed for the NDS8947 are compatible with the FDS4935BZ without modification.

Q: What is the availability status of the FDS4935BZ?

A: The FDS4935BZ is an Active product with 27,189 pieces currently in stock. The NDS8947 is classified as Obsolete. The substitute part ensures long-term design support and supply chain continuity.

Q: Are there any compliance or regulatory differences between these parts?

A: Both parts carry identical REACH Unaffected status and EAR99 ECCN classification. The FDS4935BZ is RoHS3 Compliant, supporting modern regulatory requirements. Moisture Sensitivity Level (MSL 1 - Unlimited) is identical for both devices.