Grayhill 78H01 DIP Switch Equivalent & Substitute Parts

Part Overview

The Grayhill 78H01 is a 4-position slide DIP switch designed for through-hole mounting applications requiring 150mA switching capacity at 30VDC. This component features a standard slide actuator with raised level, copper alloy contacts finished in gold, and operates across an industrial temperature range of -40°C to 85°C.

The 78H01 carries an obsolete product status. Identifying functionally equivalent substitute parts is necessary to support ongoing maintenance, repair, and production requirements for legacy systems utilizing this component.

Substiute Parts

78H01

Grayhill Inc.In Stock: 80278H01 Datasheet

Current PartRFQ

78H01T

Grayhill Inc.In Stock: 161278H01T Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Grayhill 78H01 is determined by strict equivalence across the following critical parameters:

Electrical Parameters: Circuit configuration (4PST), number of positions (1), current rating (150mA), and voltage rating (30VDC) must be identical.

Mechanical Parameters: Actuator type (Slide Standard), actuator level (Raised), contact material (Copper Alloy), contact finish (Gold), height above board (0.315"), mounting type (Through Hole), termination style (PC Pin), and pitch (0.100") must match exactly.

Physical Dimensions: Length (0.480"), body material (Thermoplastic), and operating temperature range (-40°C to 85°C) must be identical.

Environmental Ratings: Moisture Sensitivity Level (1 - Unlimited) must be equivalent.

The substitute part 78H01T meets all these criteria and is manufactured by the same supplier (Grayhill Inc.), ensuring functional and mechanical compatibility with the original 78H01.

Parameter Comparison

Engineering Selection Recommendations

The Grayhill 78H01T serves as the direct functional equivalent to the obsolete 78H01. All electrical, mechanical, and dimensional parameters are identical, ensuring drop-in compatibility in existing circuit designs and PCB layouts.

Product Status Consideration: The 78H01 is classified as obsolete, while the 78H01T maintains active product status. Selection of the 78H01T provides access to current manufacturing, quality assurance, and supply chain support.

Compliance Advantage: The 78H01T achieves ROHS3 compliance, whereas the original 78H01 is RoHS non-compliant. Applications subject to RoHS regulatory requirements benefit from substitution with the 78H01T.

Packaging Difference: The 78H01T is supplied in tube packaging, compared to bulk packaging for the 78H01. This difference does not affect electrical or mechanical performance and relates only to order quantity and handling considerations.

Frequently Asked Questions (FAQ)

Q: Can the 78H01T be used as a direct replacement for the 78H01 in existing designs?

A: Yes. The 78H01T is electrically and mechanically identical to the 78H01 across all specified parameters. No circuit modifications or PCB layout changes are required.

Q: What is the primary reason to substitute the 78H01 with the 78H01T?

A: The 78H01 is obsolete. The 78H01T is the active equivalent part from the same manufacturer, ensuring continued availability and supply chain support.

Q: Does the RoHS3 compliance of the 78H01T affect compatibility?

A: No. RoHS3 compliance is an environmental and regulatory attribute that does not alter electrical or mechanical function. The 78H01T operates identically to the 78H01 in all circuit applications.

Q: Are there packaging considerations when ordering the 78H01T?

A: The 78H01T is supplied in tube packaging. Verify that tube packaging meets your procurement and handling requirements. Electrical and mechanical specifications remain unchanged regardless of packaging format.

Q: Do the 2,000-cycle mechanical and electrical life ratings apply to both parts?

A: Yes. Both the 78H01 and 78H01T are rated for 2,000 mechanical cycles and 2,000 electrical cycles under specified operating conditions.

Q: Is the 0.100" (2.54mm) pitch compatible with standard PCB layouts?

A: Yes. The 0.100" pitch is a standard spacing for through-hole DIP switch mounting and is compatible with conventional PCB designs.