FDY6342L Equivalent & Substitute Parts

Part Overview

The FDY6342L is a power switch/driver IC manufactured by onsemi, designed as a 1:1 P-Channel high-side switch with 830mA output capability in a SOT-563F package. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity. The part operates across a load voltage range of 2.5V to 8V with typical on-resistance of 280mOhm, serving general-purpose switching applications requiring non-inverting control logic.

Substiute Parts

FDY6342L

onsemiIn Stock: 1090FDY6342L Datasheet

Current PartRFQ

SI1040X-T1-GE3

Vishay SiliconixIn Stock: 5292SI1040X-T1-GE3 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the FDY6342L is determined by strict alignment of the following electrical and mechanical parameters:

• Output Type: P-Channel high-side switch configuration
• Ratio: 1:1 input-to-output relationship
• Interface: On/Off control logic
• Package Compatibility: SOT-563F or equivalent footprint
• Operating Temperature Range: -55°C ~ 150°C (TJ)
• Load Voltage Range: Minimum 2.5V support required
• Current Capability: Minimum 830mA output current
• On-Resistance: Electrical performance within acceptable limits for the application
• Compliance: ROHS3 and REACH requirements

The SI1040X-T1-GE3 from Vishay Siliconix meets the core substitution criteria as a 1:1 P-Channel high-side switch in SC-89 (SOT-563F) packaging with matching temperature range and compliance certifications. However, specific electrical parameters differ and must be evaluated for application compatibility.

Parameter Comparison

Engineering Selection Recommendations

The SI1040X-T1-GE3 is an active product with current manufacturing support, addressing the obsolescence status of the FDY6342L. Both parts maintain identical operating temperature ranges (-55°C ~ 150°C TJ) and comply with ROHS3 and REACH requirements, ensuring regulatory alignment for new designs.

Key differences in electrical performance must be evaluated against application requirements. The SI1040X-T1-GE3 provides reduced maximum output current (430mA versus 830mA) and higher typical on-resistance (500mOhm versus 280mOhm). The SI1040X-T1-GE3 also supports a lower minimum load voltage (1.8V versus 2.5V), extending operational range in low-voltage applications.

Selection between these parts depends on whether the application load current requirement can be satisfied by the 430mA maximum output of the SI1040X-T1-GE3 and whether the increased on-resistance is acceptable for thermal and efficiency considerations.

Frequently Asked Questions (FAQ)

Q: Can the SI1040X-T1-GE3 directly replace the FDY6342L in existing designs?

A: Direct replacement requires verification that application load current does not exceed 430mA and that the increased on-resistance (500mOhm versus 280mOhm) is acceptable for thermal performance. Both parts share identical SOT-563F packaging and pin configuration, enabling footprint compatibility.

Q: What is the significance of the current rating difference between these parts?

A: The FDY6342L supports 830mA maximum output current, while the SI1040X-T1-GE3 is rated for 430mA. Applications requiring current delivery above 430mA cannot use the SI1040X-T1-GE3 as a substitute.

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

A: Both parts maintain ROHS3 compliance and REACH unaffected status. Moisture sensitivity levels are identical at MSL 1 (Unlimited), ensuring equivalent handling and storage requirements.

Q: How does the on-resistance difference affect circuit performance?

A: The SI1040X-T1-GE3 exhibits 500mOhm typical on-resistance compared to 280mOhm for the FDY6342L. At maximum rated current (430mA), this results in increased power dissipation and heat generation. Thermal analysis is required to confirm acceptability in the target application.

Q: Does the SI1040X-T1-GE3 support the same voltage range as the FDY6342L?

A: The SI1040X-T1-GE3 supports 1.8V to 8V load voltage, extending the lower voltage limit compared to the FDY6342L (2.5V to 8V). Both parts support the full 8V upper limit.