Grayhill 78RB08 DIP Switch Equivalent & Substitute Parts

Part Overview

The Grayhill 78RB08 is an 8-position DIP switch with SPST (Single Pole Single Throw) circuit configuration, rated for 150mA at 30VDC. This component is classified as obsolete, which necessitates identification of active equivalent parts for ongoing design support and procurement continuity. The 78RB08 features a slide actuator with standard (flush, recessed) positioning, through-hole mounting, and gold-plated copper alloy contacts suitable for general-purpose switching applications in industrial and commercial electronics.

Substiute Parts

78RB08

Grayhill Inc.In Stock: 94278RB08 Datasheet

Current PartRFQ

78RB08T

Grayhill Inc.In Stock: 128378RB08T Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the Grayhill 78RB08 is determined by strict equivalence across all electrical and mechanical parameters. The primary substitute identified is the 78RB08T, which maintains identical specifications across the following critical parameters:

Electrical Parameters:

• Circuit type: SPST
• Number of positions: 8
• Current rating: 150mA
• Voltage rating: 30VDC
• Contact material and finish: Copper alloy with gold plating

Mechanical Parameters:

• Actuator type and level: Slide (Standard), Flush/Recessed
• Mounting configuration: Through-hole with PC pin termination
• Pitch spacing: 0.100" (2.54mm)
• Height above board: 0.265" (6.73mm)
• Body material: Thermoplastic

Environmental Parameters:

• Operating temperature range: -40°C to 85°C
• Mechanical and electrical life: 2,000 cycles each
• Moisture sensitivity: MSL 1 (Unlimited)

The 78RB08T differs from the 78RB08 only in product status (Active vs. Obsolete), packaging format (Tube vs. standard), and regulatory compliance (RoHS3 Compliant vs. RoHS non-compliant). These differences do not affect functional or physical compatibility.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection: Grayhill 78RB08T

The 78RB08T is the direct functional equivalent of the obsolete 78RB08. Selection of the 78RB08T is based on the following engineering criteria:

1. Product Status: The 78RB08T maintains Active product status, ensuring ongoing manufacturer support, availability, and supply chain continuity. The 78RB08 is classified as Obsolete, which restricts future procurement and technical support.

2. Regulatory Compliance: The 78RB08T is RoHS3 Compliant, meeting current environmental and hazardous substance restrictions applicable to electronic components in regulated markets. The 78RB08 is RoHS non-compliant and may not satisfy procurement requirements for new designs or applications subject to RoHS directives.

3. Functional Equivalence: All electrical, mechanical, and environmental parameters are identical between the two parts. The 78RB08T provides drop-in compatibility for existing PCB layouts and circuit designs without modification to footprint, spacing, or electrical characteristics.

4. Packaging Availability: The 78RB08T is supplied in Tube packaging, which is standard for active production components and facilitates automated assembly processes.

The 78RB08T is suitable for direct substitution in all applications where the 78RB08 was previously specified.

Frequently Asked Questions (FAQ)

Q: Can the 78RB08T be used as a direct replacement for the 78RB08 on existing PCBs?

A: Yes. The 78RB08T is physically and electrically identical to the 78RB08. Both parts share identical through-hole mounting dimensions, pitch spacing (0.100"), height above board (0.265"), and PC pin termination. No PCB layout modifications are required.

Q: What is the difference between the 78RB08 and 78RB08T?

A: The primary differences are product status, regulatory compliance, and packaging. The 78RB08 is Obsolete and RoHS non-compliant, while the 78RB08T is Active and RoHS3 Compliant. Both parts are electrically and mechanically identical.

Q: Why is the 78RB08 classified as Obsolete?

A: Obsolete status indicates that the manufacturer has discontinued active production and support for this part number. The 78RB08T represents the current active equivalent in the Grayhill 78 series.

Q: Are there any electrical performance differences between the 78RB08 and 78RB08T?

A: No. Both parts are rated for 150mA at 30VDC, feature identical contact materials (copper alloy with gold plating), and support the same operating temperature range (-40°C to 85°C) and mechanical/electrical life cycles (2,000 cycles each).

Q: What does RoHS3 Compliance mean for the 78RB08T?

A: RoHS3 Compliance indicates that the 78RB08T meets the Restriction of Hazardous Substances Directive, limiting the use of specific hazardous materials in electrical and electronic equipment. This compliance is required for many applications in regulated markets and is a standard requirement for new component procurement.

Q: Can the 78RB08 be used in new designs?

A: The 78RB08 is not recommended for new designs due to its Obsolete status and RoHS non-compliance. The 78RB08T should be specified for all new applications to ensure regulatory compliance and long-term supply availability.

Q: What is the Moisture Sensitivity Level (MSL) for these parts?

A: Both the 78RB08 and 78RB08T are rated MSL 1 (Unlimited), indicating unlimited shelf life without moisture control requirements. These parts do not require special storage or handling conditions related to moisture sensitivity.

Q: Are both parts available in the same packaging options?

A: The 78RB08 is supplied in standard packaging, while the 78RB08T is supplied in Tube packaging. Tube packaging is standard for active production components and is compatible with automated assembly equipment.