ECH8649-TL-H Equivalent & Substitute Parts

Part Overview

The ECH8649-TL-H is a dual N-channel MOSFET array manufactured by onsemi, rated for 20V drain-to-source voltage and 7.5A continuous drain current. This component is classified as obsolete, necessitating identification of active substitute parts that maintain electrical and mechanical compatibility for existing designs. Substitute parts must satisfy the core electrical parameters while accommodating packaging and performance variations inherent to alternative device families.

Substiute Parts

ECH8649-TL-H

onsemiIn Stock: 2833ECH8649-TL-H Datasheet

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ECH8697R-TL-W

onsemiIn Stock: 62385ECH8697R-TL-W Datasheet

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AON3814

Alpha & Omega Semiconductor Inc.In Stock: 8170AON3814 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ECH8649-TL-H are selected based on the following criteria:

Electrical Compatibility Requirements:

• Drain-to-source voltage rating equal to or greater than 20V
• Continuous drain current rating equal to or greater than 7.5A
• On-resistance (Rds On) at specified gate-source voltage compatible with circuit design
• Logic level gate drive capability
• Dual N-channel configuration

Mechanical Compatibility Requirements:

• Surface mount technology
• 8-pin package format with flat lead configuration
• Moisture sensitivity level MSL 1 or equivalent

Regulatory & Compliance Requirements:

• REACH compliance status
• ECCN classification EAR99
• RoHS compliance status (preferred for active parts)

The ECH8697R-TL-W and AON3814 satisfy these criteria with variations in voltage rating, current capacity, and package designation that do not preclude functional substitution in applications designed within the ECH8649-TL-H electrical envelope.

Parameter Comparison

Engineering Selection Recommendations

ECH8697R-TL-W (onsemi)

The ECH8697R-TL-W is an active onsemi product with higher voltage rating (24V) and current capacity (10A) than the ECH8649-TL-H. This part provides superior electrical headroom for applications operating near the 20V limit. The lower gate charge (6nC versus 10.8nC) reduces switching losses. RoHS3 compliance and active product status support long-term supply chain continuity. Package designation SOT-28FL/ECH8 maintains 8-pin flat lead surface mount compatibility. This substitute is suitable for designs where higher voltage and current ratings do not create thermal or layout constraints.

AON3814 (Alpha & Omega Semiconductor Inc.)

The AON3814 maintains the exact 20V drain-to-source voltage rating and equivalent on-resistance specification (17mOhm) as the ECH8649-TL-H. The 8-DFN (3x3) package provides higher power dissipation capability (2.5W versus 1.5W), beneficial for thermally demanding applications. Extended operating temperature range (-55°C to 150°C) accommodates wider environmental specifications. RoHS3 compliance and active product status ensure availability. Package footprint differs from the original 8-ECH designation, requiring PCB layout verification. This substitute is suitable for applications requiring thermal margin or extended temperature operation.

Both substitutes maintain logic level gate drive capability, MSL 1 moisture sensitivity, and regulatory compliance (REACH, EAR99) consistent with the original part.

Frequently Asked Questions (FAQ)

Q: Can the ECH8697R-TL-W replace the ECH8649-TL-H in all applications?

A: The ECH8697R-TL-W has higher voltage (24V) and current (10A) ratings than the ECH8649-TL-H (20V, 7.5A). Substitution is valid for applications operating within the ECH8649-TL-H electrical envelope. Verify that circuit design does not depend on the lower voltage rating or specific gate charge characteristics. Package designation differs (SOT-28FL/ECH8 versus 8-ECH), requiring PCB footprint confirmation.

Q: What are the key differences between the AON3814 and ECH8649-TL-H?

A: The AON3814 matches the 20V voltage rating and 17mOhm on-resistance of the ECH8649-TL-H. Differences include higher power rating (2.5W versus 1.5W), extended temperature range (-55°C to 150°C), and different package designation (8-DFN 3x3 versus 8-ECH). The AON3814 provides thermal margin and wider environmental operation. PCB layout changes are required due to package differences.

Q: Are there package compatibility concerns with these substitutes?

A: Yes. The ECH8649-TL-H uses 8-ECH package format. The ECH8697R-TL-W uses SOT-28FL/ECH8 format, and the AON3814 uses 8-DFN (3x3) format. While all are 8-pin surface mount with flat leads, physical dimensions and pin layouts differ. PCB footprint verification is mandatory before substitution.

Q: Do the substitute parts support logic level gate drive?

A: Yes. Both ECH8697R-TL-W and AON3814 feature logic level gate drive capability. The ECH8697R-TL-W additionally supports 2.5V drive operation, providing enhanced flexibility for low-voltage gate drive circuits.

Q: What is the impact of lower gate charge in the ECH8697R-TL-W?

A: The ECH8697R-TL-W has lower gate charge (6nC versus 10.8nC at 4.5V). This reduces switching losses and gate drive power requirements, beneficial for high-frequency switching applications. Circuit designs dependent on specific gate charge timing must be evaluated.

Q: Are both substitutes RoHS compliant?

A: Yes. Both ECH8697R-TL-W and AON3814 are RoHS3 compliant. The original ECH8649-TL-H RoHS status is not specified in the provided data.

Q: What is the moisture sensitivity level for these parts?

A: All three parts (ECH8649-TL-H, ECH8697R-TL-W, and AON3814) have MSL 1 (Unlimited) rating, indicating no moisture sensitivity restrictions for storage and handling.

Q: Which substitute is preferred for thermal applications?

A: The AON3814 has higher maximum power rating (2.5W versus 1.5W) and extended operating temperature range (-55°C to 150°C), making it suitable for thermally demanding applications. Verify thermal design margins for the specific application.