FDC37C78-HT Equivalent & Substitute Parts

Part Overview

The FDC37C78-HT is a specialized interface IC manufactured by Microchip Technology in a 48-TQFP (7x7) package. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing system support and new design implementations. The part operates at supply voltages of 3.3V and 5V, serving applications requiring interface functionality in surface mount configurations.

Substiute Parts

FDC37C78-HT

Microchip TechnologyIn Stock: 1993FDC37C78-HT Datasheet

Current PartRFQ

PI3HDX621FBEX

Diodes IncorporatedIn Stock: 5801PI3HDX621FBEX Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FDC37C78-HT is determined by the following critical parameters:

• Package compatibility: 48-LQFP (7x7) form factor for direct PCB footprint alignment
• Supply voltage range: Support for 3.3V operation as minimum requirement
• Interface functionality classification
• Surface mount mounting type
• RoHS3 compliance for regulatory alignment
• Moisture sensitivity level: MSL 3 (168 Hours)

The PI3HDX621FBEX qualifies as a substitute based on matching these core electrical and mechanical specifications.

Parameter Comparison

Engineering Selection Recommendations

The PI3HDX621FBEX from Diodes Incorporated serves as the primary substitute for the obsolete FDC37C78-HT. Both components maintain identical package dimensions (48-LQFP, 7x7mm), identical moisture sensitivity specifications (MSL 3, 168 Hours), and equivalent RoHS3 compliance status. The substitute part is currently in active production status, ensuring long-term availability and supply chain continuity.

The PI3HDX621FBEX operates at 3.3V supply voltage, which aligns with the minimum supply voltage requirement of the original part. Applications requiring 5V operation must be evaluated against the substitute's 3.3V specification to determine system compatibility.

Frequently Asked Questions (FAQ)

Q: Can the PI3HDX621FBEX directly replace the FDC37C78-HT in existing designs?

A: Direct replacement is possible from a package and pinout perspective, as both components use the 48-LQFP (7x7) form factor. However, the supply voltage specification difference (3.3V only for the substitute versus 3.3V/5V for the original) must be evaluated against your specific application requirements.

Q: What is the significance of the obsolete product status for the FDC37C78-HT?

A: Obsolete status indicates that Microchip Technology has discontinued manufacturing and support for this part. Identifying and qualifying substitute parts is necessary for system maintenance, repairs, and new production runs.

Q: Are the moisture sensitivity levels identical between the two parts?

A: Yes, both the FDC37C78-HT and PI3HDX621FBEX carry MSL 3 (168 Hours) ratings, indicating equivalent moisture handling and storage requirements.

Q: What compliance certifications apply to both parts?

A: Both components are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards for electronic component manufacturing and distribution.

Q: Does the substitute part support 5V operation?

A: The PI3HDX621FBEX is specified for 3.3V supply voltage only. Applications requiring 5V operation must be reassessed for compatibility with the substitute part's electrical specifications.