ECH8315-TL-W Equivalent & Substitute Parts

Part Overview

The ECH8315-TL-W is a P-Channel MOSFET manufactured by onsemi, rated for 30V drain-to-source voltage with 7.5A continuous drain current at 25°C. The device is packaged in a surface mount SOT-28FL/ECH8 configuration and is designed for applications requiring P-channel switching and amplification in compact form factors.

This part is classified as obsolete. Identifying equivalent and substitute components is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for systems utilizing this MOSFET.

Substiute Parts

ECH8315-TL-W

onsemiIn Stock: 843ECH8315-TL-W Datasheet

Current PartRFQ

FDS4435BZ

onsemiIn Stock: 68203FDS4435BZ Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ECH8315-TL-W is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• FET Type: P-Channel topology must be maintained
• Drain to Source Voltage (Vdss): Minimum 30V rating required
• Continuous Drain Current (Id): Minimum 7.5A at 25°C required
• Rds On (Max): Must not exceed the original specification to maintain thermal performance
• Power Dissipation: Must support the thermal requirements of the application
• Operating Temperature Range: Must include 150°C maximum junction temperature

Mechanical Compatibility Criteria:

• Mounting Type: Surface mount configuration required
• Package Footprint: Pin count and lead spacing must be compatible with existing PCB layouts

The FDS4435BZ qualifies as a substitute based on these parameters. It maintains P-Channel topology, exceeds the 30V Vdss requirement, provides higher continuous drain current (8.8A versus 7.5A), and delivers improved thermal performance with 2.5W power dissipation. The device is classified as active product status with full RoHS3 compliance, ensuring long-term availability and regulatory alignment.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The ECH8315-TL-W is classified as obsolete, which restricts long-term availability and future supply chain support. The FDS4435BZ is classified as active product status, ensuring continued manufacturing, technical support, and regulatory compliance updates from onsemi.

Regulatory Compliance: The FDS4435BZ carries RoHS3 compliance certification, meeting current environmental and hazardous substance restrictions. Both devices maintain REACH Unaffected status and EAR99 export classification, ensuring regulatory alignment across global markets.

Electrical Performance: The FDS4435BZ provides superior electrical characteristics within the same voltage class. The lower on-resistance (20 mOhm versus 25 mOhm) and higher continuous drain current rating (8.8A versus 7.5A) deliver improved thermal efficiency and current handling capacity. The increased power dissipation rating (2.5W versus 1.5W) supports higher-power applications.

Package Consideration: The FDS4435BZ uses an 8-SOIC package, which differs from the SOT-28FL/ECH8 package of the ECH8315-TL-W. PCB layout modifications are required to accommodate the different package footprint and pin configuration. Pin-to-pin functional mapping must be verified during design integration.

Frequently Asked Questions (FAQ)

Q: Can the FDS4435BZ directly replace the ECH8315-TL-W without PCB modifications?

A: No. While both devices are P-Channel MOSFETs with identical 30V Vdss ratings, they use different package types. The ECH8315-TL-W uses SOT-28FL/ECH8 packaging, while the FDS4435BZ uses 8-SOIC packaging. PCB layout changes are required to accommodate the different footprint and pin spacing.

Q: What are the key electrical advantages of the FDS4435BZ over the ECH8315-TL-W?

A: The FDS4435BZ offers three primary electrical improvements: (1) lower on-resistance of 20 mOhm compared to 25 mOhm, reducing conduction losses; (2) higher continuous drain current of 8.8A compared to 7.5A, enabling higher current applications; (3) higher power dissipation rating of 2.5W compared to 1.5W, supporting increased thermal load.

Q: Is the FDS4435BZ suitable for applications currently using the ECH8315-TL-W?

A: The FDS4435BZ is electrically suitable for applications within the 30V, 7.5A operating envelope of the ECH8315-TL-W. The superior electrical ratings of the FDS4435BZ provide design margin and improved performance. However, PCB layout redesign is mandatory due to package differences.

Q: What is the significance of the obsolete product status for the ECH8315-TL-W?

A: Obsolete product status indicates that onsemi has discontinued manufacturing and will not provide future supply. Existing inventory may be limited. The FDS4435BZ, classified as active, ensures continued availability, technical support, and compliance with evolving regulatory standards.

Q: Are there any gate drive voltage differences between these devices?

A: The FDS4435BZ supports a maximum gate-source voltage of ±25V, compared to ±20V for the ECH8315-TL-W. This provides additional gate drive margin in the FDS4435BZ. Both devices operate with standard gate drive circuits designed for P-Channel MOSFETs.

Q: What is the operating temperature range difference?

A: The ECH8315-TL-W specifies a maximum junction temperature of 150°C without a stated minimum. The FDS4435BZ specifies an operating range of −55°C to 150°C, providing explicit low-temperature operation capability. Both devices support the same maximum junction temperature.

Q: How do the input capacitance specifications compare?

A: The FDS4435BZ has higher input capacitance (1845 pF @ 15V) compared to the ECH8315-TL-W (875 pF @ 10V). This difference reflects the larger die size and higher current capability of the FDS4435BZ. Gate drive circuit design may require adjustment to account for increased capacitive loading.