Equivalent & Substitute Parts for Grayhill 78RB12 DIP Switch

Part Overview

The Grayhill 78RB12 is a 12-position slide actuator DIP switch designed for through-hole mounting applications requiring SPST (Single Pole Single Throw) switching at 150mA and 30VDC. This component is classified as obsolete, which necessitates identification of active equivalent parts for ongoing procurement and design continuity. The 78RB12T serves as the direct functional equivalent, offering identical electrical and mechanical specifications while maintaining active product status.

Substiute Parts

78RB12

Grayhill Inc.In Stock: 85278RB12 Datasheet

Current PartRFQ

78RB12T

Grayhill Inc.In Stock: 111778RB12T Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution between the 78RB12 and 78RB12T is based on strict equivalence across all critical electrical and mechanical parameters. Both parts share identical specifications for circuit configuration (SPST), position count (12), current rating (150mA), voltage rating (30VDC), actuator type (slide standard), mounting method (through hole), pitch (0.100"), physical dimensions, operating temperature range (-40°C to 85°C), and lifecycle ratings (2,000 mechanical and electrical cycles).

The primary distinction between these parts is product status and packaging format. The 78RB12 is obsolete and supplied in standard packaging, while the 78RB12T is active and supplied in tube packaging. The 78RB12T incorporates RoHS3 compliance, whereas the 78RB12 is RoHS non-compliant. Both parts maintain identical contact material (copper alloy with gold finish), termination style (PC pin), body material (thermoplastic), and regulatory classifications (REACH unaffected, ECCN EAR99).

Parameter Comparison

Engineering Selection Recommendations

The 78RB12T is the appropriate selection for new designs and ongoing procurement applications. This part maintains full functional and dimensional equivalence to the 78RB12 while offering the advantage of active product status, ensuring long-term availability and supply chain stability. The 78RB12T incorporates RoHS3 compliance, meeting current environmental and regulatory requirements for electronic components in most jurisdictions.

For applications where RoHS compliance is not a requirement and existing inventory of 78RB12 units is available, the obsolete part may be used in legacy systems. However, procurement of new 78RB12 units is not recommended due to obsolete status. The 78RB12T is supplied in tube packaging, which is standard for production environments and automated assembly processes.

Both parts are classified as REACH unaffected and carry ECCN EAR99 designation, indicating no special export restrictions apply to either component.

Frequently Asked Questions (FAQ)

Q: Can the 78RB12T directly replace the 78RB12 in existing PCB designs?

A: Yes. The 78RB12T is a direct functional and dimensional equivalent. All electrical parameters (150mA, 30VDC, SPST), mechanical dimensions (0.265" height, 1.280" length, 0.100" pitch), and mounting characteristics (through-hole, PC pin termination) are identical. No PCB layout modifications are required.

Q: What is the primary difference between these two parts?

A: The 78RB12 is obsolete, while the 78RB12T is active. The 78RB12T also incorporates RoHS3 compliance, whereas the 78RB12 is RoHS non-compliant. Packaging differs: standard for 78RB12 and tube for 78RB12T.

Q: Are there any electrical performance differences between the 78RB12 and 78RB12T?

A: No. Both parts share identical electrical specifications: 150mA current rating, 30VDC voltage rating, SPST circuit configuration, 2,000 mechanical cycles, and 2,000 electrical cycles. Operating temperature range is -40°C to 85°C for both.

Q: Does the tube packaging of the 78RB12T affect compatibility?

A: No. Tube packaging is a supply format only and does not affect component functionality or performance. The physical component itself is identical to the standard packaging format.

Q: Is the 78RB12T suitable for applications requiring RoHS compliance?

A: Yes. The 78RB12T is RoHS3 compliant. The original 78RB12 is RoHS non-compliant and should not be used in applications with RoHS requirements.

Q: What is the current inventory status for these parts?

A: The 78RB12 has 827 pieces in stock (new original). The 78RB12T has 1,098 pieces in stock (new original). Given the obsolete status of the 78RB12, the 78RB12T is the recommended source for new procurement.