FDR842P MOSFET P-Channel 12V 11A Equivalent & Substitute Parts

Part Overview

The FDR842P is a P-Channel MOSFET manufactured by onsemi, rated for 12V drain-to-source voltage with 11A continuous drain current at 25°C. The device is housed in a SuperSOT™-8 surface mount package and is designed for applications requiring moderate power dissipation (1.8W maximum). The FDR842P is classified as obsolete, making identification of functionally equivalent substitute components necessary for ongoing design support and procurement.

Substiute Parts

FDR842P

onsemiIn Stock: 1540FDR842P Datasheet

Current PartRFQ

FDC606P

onsemiIn Stock: 48917FDC606P Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FDR842P 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 12V rating required
• Continuous Drain Current (Id): Minimum 11A at 25°C required
• On-State Resistance (Rds On): Maximum 9mOhm at rated current and gate voltage
• Power Dissipation: Maximum 1.8W at ambient temperature
• Gate Threshold Voltage (Vgs(th)): 1.5V maximum at 250µA
• Maximum Gate Voltage (Vgs): ±8V rating required
• Operating Temperature Range: -55°C to 150°C (TJ) minimum

Mechanical Compatibility Criteria:

• Mounting Type: Surface Mount required
• Package Compatibility: SuperSOT™-8 or equivalent pinout configuration

The FDC606P is identified as a substitute part; however, it exhibits reduced continuous drain current (6A versus 11A) and increased on-state resistance (26mOhm versus 9mOhm), indicating it functions as a lower-current alternative suitable only for applications with reduced current requirements.

Parameter Comparison

Engineering Selection Recommendations

FDC606P Substitution Constraints:

The FDC606P is an active product from onsemi with current manufacturing status and full availability (48,900 pieces in stock). However, direct substitution is limited by the following factors:

1. Current Rating Mismatch: The FDC606P is rated for 6A continuous drain current, which is 45% lower than the FDR842P's 11A rating. This part is suitable only for applications where the actual operating current does not exceed 6A.

2. On-State Resistance Increase: The FDC606P exhibits 26mOhm Rds On compared to 9mOhm for the FDR842P. This 189% increase in resistance results in higher power dissipation and heat generation at equivalent current levels.

3. Package Incompatibility: The FDC606P uses SuperSOT™-6 (SOT-23-6) packaging versus the FDR842P's SuperSOT™-8 (8-LSOP) packaging. PCB layout and pinout modifications are required.

4. Compliance Status: The FDC606P carries RoHS3 compliance certification, whereas the FDR842P status is not specified. Both parts are REACH Unaffected and classified under ECCN EAR99.

Selection Guidance:

The FDC606P functions as a lower-current alternative for applications with reduced current demands. For applications requiring the full 11A current rating and 9mOhm on-state resistance of the FDR842P, alternative sources or design modifications are necessary. The active product status of the FDC606P provides supply chain continuity for lower-current designs.

Frequently Asked Questions (FAQ)

Q: Can the FDC606P directly replace the FDR842P in existing designs?

A: Direct replacement is not recommended for applications requiring the full 11A current rating. The FDC606P is rated for 6A maximum continuous drain current. If your application operates at or below 6A, the FDC606P is electrically compatible. PCB layout modifications are required due to package differences (SuperSOT™-6 versus SuperSOT™-8).

Q: What is the impact of the increased Rds On value in the FDC606P?

A: The FDC606P exhibits 26mOhm on-state resistance compared to 9mOhm in the FDR842P. At 6A operation, this results in approximately 0.936W power dissipation in the FDC606P versus 0.324W in the FDR842P at equivalent conditions. Thermal management design must account for this increased dissipation.

Q: Are there pinout compatibility issues between these parts?

A: Yes. The FDR842P uses an 8-pin SuperSOT™-8 package (8-LSOP), while the FDC606P uses a 6-pin SuperSOT™-6 package (SOT-23-6). Pinout configurations differ, requiring PCB redesign and layout modifications.

Q: What is the product status difference, and why does it matter?

A: The FDR842P is classified as obsolete, indicating discontinued manufacturing. The FDC606P is active with current production and 48,900 units in stock. For new designs or long-term supply requirements, the FDC606P provides manufacturing continuity, though with the noted electrical and package limitations.

Q: Are both parts compliant with environmental and trade regulations?

A: Both parts are REACH Unaffected and classified under ECCN EAR99. The FDC606P carries RoHS3 compliance certification. Both have Moisture Sensitivity Level (MSL) 1 (Unlimited), indicating no moisture sensitivity restrictions.

Q: What gate charge differences exist between these parts?

A: The FDR842P has 80nC gate charge at 4.5V, while the FDC606P has 25nC. The lower gate charge in the FDC606P results in faster switching characteristics and reduced driver power requirements, which may provide benefits in high-frequency switching applications.

Q: Can the FDC606P be used in applications where current demand occasionally exceeds 6A?

A: No. The FDC606P is rated for 6A continuous drain current at 25°C. Operation above this rating will result in device degradation and potential failure. Applications with variable or peak current demands exceeding 6A require alternative components rated for the full current range.