ATP102-TL-H Equivalent & Substitute Parts

Part Overview

The ATP102-TL-H is a P-Channel MOSFET manufactured by onsemi, rated for 30V drain-to-source voltage with 40A continuous drain current at Ta (ambient temperature). The device is housed in an ATPAK surface mount package with integrated tab for thermal management. This part is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement continuity.

Substiute Parts

ATP102-TL-H

onsemiIn Stock: 6246ATP102-TL-H Datasheet

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FDD6685

onsemiIn Stock: 20485FDD6685 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the ATP102-TL-H is determined by equivalence across the following critical electrical and mechanical parameters:

Electrical Equivalence Criteria:

• Drain-to-Source Voltage (Vdss): Must equal or exceed 30V
• P-Channel FET topology with MOSFET technology
• Gate voltage rating (Vgs Max) compatible with ±20V or higher
• On-state resistance (Rds On) within acceptable operating margins for the application

Mechanical Equivalence Criteria:

• Surface mount technology
• Package footprint compatibility or functional equivalence
• Thermal management capability (power dissipation rating)

Functional Equivalence Criteria:

• Continuous drain current capability at rated temperature
• Gate charge and input capacitance suitable for switching applications
• RoHS3 compliance and moisture sensitivity level (MSL 1)

The FDD6685 qualifies as a substitute based on matching Vdss (30V), P-Channel configuration, surface mount deployment, and compliance certifications. Package differences (ATPAK versus TO-252-3) require PCB layout verification but do not preclude functional substitution.

Parameter Comparison

Engineering Selection Recommendations

ATP102-TL-H Status: The ATP102-TL-H is classified as obsolete. Continued procurement is limited, and long-term availability cannot be assured. New designs should transition to active alternatives.

FDD6685 as Primary Substitute: The FDD6685 is an active product from the same manufacturer (onsemi) with identical Vdss (30V) and equivalent P-Channel MOSFET topology. Both devices maintain RoHS3 compliance and MSL 1 moisture sensitivity ratings, ensuring regulatory and supply chain continuity.

Key Considerations:

• The FDD6685 operates across an extended temperature range (-55°C to 175°C) compared to the ATP102-TL-H (150°C maximum), providing broader thermal margin.
• Package transition from ATPAK to TO-252-3 (DPAK) requires PCB layout modification. Both packages include a thermal tab for heat dissipation.
• The FDD6685 specifies 11A continuous drain current at Ta (ambient), versus 40A for the ATP102-TL-H at Ta. However, both achieve 40A at Tc (case temperature), indicating thermal management dependency.
• On-state resistance (Rds On) values are comparable: 18.5 mOhm (ATP102-TL-H) versus 20 mOhm (FDD6685), with negligible performance impact in most applications.
• Gate charge is lower in the FDD6685 (24 nC @ 5V), reducing switching losses and driver requirements.

Compliance & Availability: Both devices are RoHS3 compliant and REACH unaffected. The FDD6685 maintains 20,400 units in active inventory, ensuring procurement reliability.

Frequently Asked Questions (FAQ)

Q: Can the FDD6685 directly replace the ATP102-TL-H without circuit modification?

A: Electrical substitution is valid. Both devices share identical Vdss (30V), P-Channel topology, and gate voltage ratings (±20V and ±25V respectively). However, package geometry differs (ATPAK versus TO-252-3 DPAK), requiring PCB footprint redesign. Thermal tab placement and lead configuration must be verified against the target PCB layout.

Q: What is the significance of the continuous drain current difference (40A Ta vs. 11A Ta)?

A: The ATP102-TL-H specifies 40A at Ta (ambient temperature), while the FDD6685 specifies 11A at Ta but 40A at Tc (case temperature). This indicates the FDD6685 requires active thermal management (heat sinking) to achieve 40A operation. For applications operating at elevated case temperatures, both devices deliver equivalent current capacity. Ambient-temperature-only applications must account for this difference.

Q: Are there thermal management differences between the two packages?

A: Both ATPAK and TO-252-3 (DPAK) packages include integrated thermal tabs for junction-to-case heat transfer. DPAK is a widely standardized package with established thermal interface materials and mounting practices. ATPAK is less common in modern designs. Thermal resistance specifications are not provided in the input parameters; PCB thermal design must be validated independently.

Q: Is the FDD6685 suitable for new product designs?

A: Yes. The FDD6685 is classified as active, ensuring long-term availability and supply continuity. It meets all RoHS3 and REACH compliance requirements. New designs should adopt the FDD6685 to avoid obsolescence risk associated with the ATP102-TL-H.

Q: How do gate charge and input capacitance affect circuit performance?

A: Gate charge (Qg) and input capacitance (Ciss) determine switching speed and driver power requirements. The FDD6685 exhibits lower gate charge (24 nC @ 5V versus 34 nC @ 10V), reducing driver current demand and switching losses. Input capacitance is comparable (1715 pF versus 1490 pF), with minimal impact on gate drive circuit design. Both parameters are within acceptable ranges for standard MOSFET driver ICs.

Q: What compliance certifications apply to both devices?

A: Both the ATP102-TL-H and FDD6685 are RoHS3 compliant, REACH unaffected, and carry MSL 1 (unlimited moisture sensitivity level) ratings. These certifications ensure compatibility with modern manufacturing processes and regulatory requirements across automotive, industrial, and consumer applications.