ECH8668-TL-H Equivalent & Substitute Parts

Part Overview

The ECH8668-TL-H is an N and P-Channel MOSFET array manufactured by onsemi, designed for surface mount applications in 8-SMD, Flat Lead packaging. This device integrates dual-channel FET functionality with logic level gate operation, rated for 20V drain-to-source voltage and continuous drain currents of 7.5A (N-channel) and 5A (P-channel). The ECH8668-TL-H is classified as obsolete product status. Identification of equivalent and substitute parts is necessary to support ongoing design requirements, legacy system maintenance, and procurement continuity where original inventory becomes unavailable.

Substiute Parts

ECH8668-TL-H

onsemiIn Stock: 3216ECH8668-TL-H Datasheet

Current PartRFQ

ECH8661-TL-H

onsemiIn Stock: 3147ECH8661-TL-H Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ECH8668-TL-H is determined by the following critical parameters:

Mandatory Compatibility Criteria:

• Configuration: N and P-Channel dual-channel MOSFET array
• Package / Case: 8-SMD, Flat Lead (8-ECH supplier device package)
• Mounting Type: Surface Mount
• FET Feature: Logic Level Gate operation
• Technology: MOSFET (Metal Oxide)

Electrical Performance Criteria:

• Drain to Source Voltage (Vdss): Must equal or exceed 20V
• Continuous Drain Current (Id): Must meet or exceed 7.5A (N-channel) and 5A (P-channel)
• Power Dissipation (Max): Must support 1.5W
• Operating Temperature: Must support 150°C junction temperature

Regulatory & Compliance Criteria:

• RoHS Status: ROHS3 Compliant
• REACH Status: REACH Unaffected
• Moisture Sensitivity Level: MSL 1 (Unlimited)

The ECH8661-TL-H qualifies as a substitute part because it maintains identical package configuration, mounting type, and logic level gate feature while providing enhanced electrical specifications (30V Vdss rating and comparable or superior current ratings) within the same 8-ECH form factor.

Parameter Comparison

Engineering Selection Recommendations

ECH8661-TL-H as Primary Substitute:

The ECH8661-TL-H is the qualified substitute for the obsolete ECH8668-TL-H based on the following engineering criteria:

1. Package and Pinout Compatibility: Both devices utilize identical 8-SMD, Flat Lead (8-ECH) packaging, ensuring direct mechanical and electrical compatibility on existing PCB layouts without redesign.

2. Functional Equivalence: Both parts are N and P-Channel MOSFET arrays with logic level gate operation, maintaining identical functional architecture within the dual-channel configuration.

3. Electrical Superiority: The ECH8661-TL-H provides enhanced voltage rating (30V Vdss versus 20V), offering improved design margin for applications operating near the original 20V specification. Continuous drain current ratings (7A N-channel, 5.5A P-channel) meet or exceed the original part specifications.

4. Regulatory Compliance: The ECH8661-TL-H maintains ROHS3 compliance, REACH unaffected status, and MSL 1 rating, satisfying all regulatory requirements of the original part.

5. Product Status: The ECH8661-TL-H carries active product status, ensuring ongoing availability and manufacturing support, addressing the obsolescence of the ECH8668-TL-H.

6. Thermal Performance: Both devices support 150°C junction temperature operation and 1.5W maximum power dissipation, maintaining thermal design compatibility.

Frequently Asked Questions (FAQ)

Q: Can the ECH8661-TL-H be used as a direct replacement for the ECH8668-TL-H without PCB modification?

A: Yes. Both devices share identical 8-SMD, Flat Lead (8-ECH) packaging and pinout configuration. Direct substitution on existing PCB layouts is supported without physical or electrical redesign.

Q: What are the key electrical differences between these parts?

A: The ECH8661-TL-H provides a higher drain-to-source voltage rating (30V versus 20V). Continuous drain current ratings are comparable (7A N-channel versus 7.5A, and 5.5A P-channel versus 5A). The ECH8661-TL-H exhibits lower input capacitance (710pF versus 1060pF at 10V), which may reduce gate drive requirements in certain applications.

Q: Is the ECH8661-TL-H suitable for applications originally designed for 20V operation?

A: Yes. The higher voltage rating of the ECH8661-TL-H (30V) is compatible with 20V applications. The device operates safely within the original voltage specification while providing additional design margin.

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

A: No. Both the ECH8668-TL-H and ECH8661-TL-H are ROHS3 compliant, REACH unaffected, and carry MSL 1 (Unlimited) moisture sensitivity rating. Regulatory requirements are identical.

Q: Why is the ECH8668-TL-H listed as obsolete?

A: The ECH8668-TL-H has reached end-of-life status in the manufacturer's product portfolio. The ECH8661-TL-H represents the active product continuation with enhanced specifications and ongoing manufacturing support.

Q: What is the difference in gate charge between these devices?

A: The ECH8668-TL-H specifies 10.8nC gate charge at 4.5V, while the ECH8661-TL-H specifies 11.8nC at 10V. Gate charge specifications are measured at different gate-source voltage conditions, reflecting the different voltage ratings of each device.

Q: Can both parts be used interchangeably in new designs?

A: The ECH8661-TL-H is the recommended choice for new designs due to its active product status, enhanced voltage rating, and ongoing manufacturer support. The ECH8668-TL-H should be used only for legacy system maintenance where original specifications are required.