Equivalent & Substitute Parts for 76STC03T

Part Overview

The 76STC03T is a DIP toggle switch manufactured by Grayhill Inc., featuring SPDT (Single Pole Double Throw) circuit configuration with 3 positions. This component is rated for 150mA at 30VDC and utilizes a through-hole mounting design with PC pin termination. The 76STC03T is classified as obsolete, making identification of compatible substitute parts essential for ongoing design support and procurement planning.

Substiute Parts

76STC03T

Grayhill Inc.In Stock: 121576STC03T Datasheet

Current PartRFQ

76STC04T

Grayhill Inc.In Stock: 117976STC04T Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 76STC03T is determined by strict alignment with the following electrical and mechanical parameters:

Critical Matching Parameters:

• Manufacturer: Grayhill Inc.
• Series: 76
• Circuit Configuration: SPDT
• Current Rating: 150mA
• Voltage Rating: 30VDC
• Actuator Type: Toggle
• Mounting Type: Through Hole
• Termination Style: PC Pin
• Pitch: 0.100" (2.54mm)
• Operating Temperature Range: -40°C to 85°C
• Contact Material: Copper Alloy
• Contact Finish: Gold

Allowable Variation Parameters:

• Number of Positions: May vary within the same series
• Physical dimensions (length, height): May vary to accommodate position count differences
• Product Status: Active status preferred for ongoing availability
• Packaging format: May differ (tube vs. other formats)

The 76STC04T qualifies as a substitute based on matching all critical parameters while varying only in position count (4 positions versus 3 positions) and resulting physical dimensions.

Parameter Comparison

Engineering Selection Recommendations

76STC04T as Primary Substitute:

The 76STC04T is the qualified substitute for the obsolete 76STC03T. Both components share identical electrical specifications (150mA, 30VDC, SPDT circuit) and mechanical compatibility (through-hole mounting, PC pin termination, 0.100" pitch). The primary difference is the increased position count (4 versus 3), which results in a longer overall length (0.780" versus 0.580").

Compliance Status:

The 76STC04T maintains full regulatory compliance with ROHS3 certification and REACH unaffected status, matching the compliance profile of the original part. Both components carry identical ECCN (EAR99) and HTSUS classifications.

Availability Advantage:

The 76STC04T holds active product status with confirmed inventory availability (1,101 pieces), whereas the 76STC03T is classified as obsolete. This status difference supports long-term design continuity and supply chain reliability.

Design Integration Consideration:

PCB layout modifications may be required to accommodate the increased length of the 76STC04T. The additional position capability does not introduce electrical incompatibility but requires verification of physical space allocation in the target application.

Frequently Asked Questions (FAQ)

Q: Can the 76STC04T directly replace the 76STC03T without circuit modification?

A: Electrical substitution is valid. Both components feature identical SPDT circuit configuration, 150mA current rating, and 30VDC voltage rating. The 4-position design of the 76STC04T is electrically compatible with applications designed for the 3-position 76STC03T. However, PCB layout verification is required due to the 0.200" length difference.

Q: What is the significance of the position count difference?

A: Position count refers to the number of discrete switch positions available. The 76STC03T provides 3 selectable positions, while the 76STC04T provides 4 selectable positions. This difference affects only the physical length and does not impact electrical performance in applications utilizing fewer positions than available.

Q: Are there packaging differences between these parts?

A: The 76STC03T is specified with standard packaging, while the 76STC04T is supplied in tube packaging. Both formats are compatible with standard component handling and assembly processes. Packaging format does not affect electrical or mechanical performance.

Q: Why is the 76STC03T classified as obsolete?

A: Obsolete status indicates that the manufacturer has discontinued production. The 76STC04T, with active product status, represents the current production equivalent within the Grayhill 76 series toggle switch family.

Q: Are the RoHS compliance levels equivalent?

A: The 76STC03T carries RoHS Compliant certification, while the 76STC04T carries ROHS3 Compliant certification. ROHS3 represents the current regulatory standard and provides enhanced compliance assurance. Both certifications satisfy RoHS requirements for lead-free manufacturing.

Q: What is the impact of the 0.200" length increase on board design?

A: The 76STC04T measures 0.780" in length compared to 0.580" for the 76STC03T. This 0.200" difference requires verification of available PCB space in the component mounting area. Height above board remains constant at 0.467", so vertical clearance is unaffected.

Q: Are the contact materials and finishes identical?

A: Both components utilize copper alloy contact material with gold finish. This ensures equivalent electrical performance, contact resistance characteristics, and long-term reliability in the specified operating temperature range of -40°C to 85°C.