FW4604-TL-2W Equivalent & Substitute Parts

Part Overview

The FW4604-TL-2W is an N and P-Channel MOSFET array manufactured by onsemi, rated for 30V drain-to-source voltage with continuous drain currents of 6A (N-channel) and 4.5A (P-channel). The device is housed in an 8-SOIC surface mount package and features logic level gate drive capability at 4.5V. This part is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement.

Substiute Parts

FW4604-TL-2W

onsemiIn Stock: 3196FW4604-TL-2W Datasheet

Current PartRFQ

FDS8958A

onsemiIn Stock: 44391FDS8958A Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FW4604-TL-2W is determined by the following critical parameters:

Electrical Compatibility Requirements:

• Drain-to-source voltage rating must equal or exceed 30V
• Continuous drain current must meet or exceed 6A (N-channel) and 4.5A (P-channel)
• On-resistance (Rds On) must not exceed the maximum specified value to maintain thermal performance
• Gate charge and input capacitance must be compatible with existing gate drive circuitry
• Configuration must remain N and P-Channel in a single package

Mechanical Compatibility Requirements:

• Package type must be 8-SOIC with identical pinout and footprint
• Surface mount mounting type required
• Operating temperature range must support 150°C junction temperature

Regulatory and Compliance Requirements:

• RoHS3 compliance required
• Moisture sensitivity level must be 1 (Unlimited)

The FDS8958A meets these substitution criteria with improved electrical performance characteristics while maintaining package and configuration compatibility.

Parameter Comparison

Engineering Selection Recommendations

FDS8958A as Primary Substitute:

The FDS8958A is a direct functional substitute for the FW4604-TL-2W. Both devices are manufactured by onsemi and share identical voltage ratings, package configuration, and compliance certifications. The FDS8958A provides improved electrical performance with higher continuous drain current ratings (7A N-channel, 5A P-channel) and lower on-resistance (28 mOhm versus 39 mOhm), resulting in reduced power dissipation and improved thermal efficiency.

The FDS8958A is classified as Last Time Buy status, indicating controlled availability. The FW4604-TL-2W is obsolete, making the FDS8958A the appropriate transition path for ongoing production and design support.

Both parts maintain RoHS3 compliance and unlimited moisture sensitivity rating, ensuring compatibility with existing manufacturing and storage protocols.

Frequently Asked Questions (FAQ)

Q: Can the FDS8958A be used as a direct replacement for the FW4604-TL-2W?

A: Yes. Both devices are N and P-Channel MOSFET arrays in 8-SOIC packages with identical 30V voltage ratings. The FDS8958A meets or exceeds all electrical specifications of the FW4604-TL-2W, including drain current and on-resistance requirements. Pinout and footprint compatibility are identical.

Q: What are the key differences between these parts?

A: The FDS8958A provides higher continuous drain current (7A N-channel versus 6A, and 5A P-channel versus 4.5A) and lower on-resistance (28 mOhm versus 39 mOhm). Gate charge is higher at 16 nC versus 9.1 nC. Input capacitance is slightly higher at 575 pF versus 490 pF. Maximum power dissipation is lower at 0.9W versus 1.8W.

Q: Are there any gate drive circuit modifications required?

A: The increased gate charge of the FDS8958A (16 nC versus 9.1 nC) may require evaluation of gate drive current capability. The higher input capacitance (575 pF versus 490 pF) may affect switching speed characteristics. Existing gate drive circuits designed for the FW4604-TL-2W should be verified for compatibility with the FDS8958A specifications.

Q: Do both parts have the same package footprint?

A: Yes. Both the FW4604-TL-2W and FDS8958A are housed in 8-SOIC packages with 0.154" (3.90 mm) width. PCB footprints are identical, allowing direct board-level substitution without layout modifications.

Q: What is the product status difference between these parts?

A: The FW4604-TL-2W is classified as obsolete, indicating end-of-life status with no further production. The FDS8958A is classified as Last Time Buy, indicating controlled availability with a defined end-of-life date. Procurement of the FDS8958A is recommended for new designs and ongoing production support.

Q: Are compliance certifications identical?

A: Yes. Both parts are RoHS3 compliant and carry moisture sensitivity level 1 (Unlimited). REACH status is unaffected for both devices. Regulatory compliance is equivalent between the two parts.