Grayhill 20SG2AC-G2AC-P Rotary Encoder: Equivalent & Substitute Parts

Part Overview

The Grayhill 20SG2AC-G2AC-P is an active mechanical rotary encoder with 20 pulses per revolution (PPR) output in Gray Code (Absolute) format. This Series 20 encoder features a right-angle orientation, 1/4" diameter flatted end actuator, and PCB through-hole mounting with PC pin termination. The component is ROHS3 compliant and maintains an unlimited moisture sensitivity level (MSL 1). With 719 units in current stock and active product status, this encoder serves applications requiring absolute position feedback with mechanical encoding.

Substitute parts become necessary when Series 20 availability is constrained, when higher rotational life specifications are required, or when alternative series configurations better match system integration requirements.

Substiute Parts

20SG2AC-G2AC-P

Grayhill Inc.In Stock: 75420SG2AC-G2AC-P Datasheet

Current PartRFQ

25BR18-G-1-20C

Grayhill Inc.In Stock: 116325BR18-G-1-20C Datasheet

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25BR18-G-1-20F

Grayhill Inc.In Stock: 84525BR18-G-1-20F Datasheet

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25BSP22-G-1-08

Grayhill Inc.In Stock: 104825BSP22-G-1-08 Datasheet

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25BSR22-G-1-16C

Grayhill Inc.In Stock: 122325BSR22-G-1-16C Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 20SG2AC-G2AC-P is determined by the following critical parameters:

Primary Compatibility Criteria:

• Encoder Type: Mechanical
• Output Type: Gray Code (Absolute)
• Actuator Type: 1/4" Dia Flatted End
• Mounting Type: PCB, Through Hole
• Orientation: Right Angle
• Termination Style: PC Pin
• Detent: No
• Built in Switch: No

Secondary Consideration:

• Pulses per Revolution: 20 PPR (primary specification) or alternative PPR values if system design permits resolution adjustment
• Rotational Life: 25K cycles minimum (higher values acceptable for extended duty applications)

Compliance Baseline:

• RoHS3 Compliant
• REACH Unaffected
• MSL 1 (Unlimited)

The substitute parts listed below maintain mechanical encoder architecture, Gray Code absolute output, identical actuator and mounting specifications, and equivalent compliance certifications. Variations in series designation (Series 25 vs. Series 20) and rotational life ratings reflect design evolution within the Grayhill product family while preserving functional interchangeability for the specified mechanical and electrical interfaces.

Parameter Comparison

Engineering Selection Recommendations

Direct Substitutes (20 PPR Output):

The 25BR18-G-1-20C and 25BR18-G-1-20F maintain identical pulses per revolution (20 PPR) specification as the primary part. Both are Series 25 encoders with enhanced rotational life ratings of 50K cycles, compared to the 25K cycle minimum of the 20SG2AC-G2AC-P. These parts preserve all mechanical, electrical, and compliance parameters. Selection between 25BR18-G-1-20C and 25BR18-G-1-20F depends on application-specific requirements not specified in the provided parameters. Both parts are ROHS3 compliant, REACH unaffected, and maintain MSL 1 status.

Alternative Substitutes (16 PPR Output):

The 25BSP22-G-1-08 and 25BSR22-G-1-16C operate at 16 pulses per revolution, representing a reduction in angular resolution compared to the 20 PPR specification. These parts are applicable only when system firmware or mechanical design accommodates lower resolution feedback. Both maintain 50K cycle rotational life, identical mounting and termination specifications, and full compliance certifications. Selection between these 16 PPR alternatives depends on resolution tolerance in the target application.

Compliance and Availability:

All substitute parts maintain active product status, ROHS3 compliance, REACH unaffected designation, and unlimited moisture sensitivity level. Current inventory levels for all substitutes exceed the primary part availability, supporting supply chain flexibility.

Frequently Asked Questions (FAQ)

Q: Can the 25BR18-G-1-20C directly replace the 20SG2AC-G2AC-P without firmware modification?

A: Yes. The 25BR18-G-1-20C maintains identical pulses per revolution (20 PPR), Gray Code absolute output, actuator type, mounting configuration, and termination style. No firmware modification is required for direct substitution. The enhanced rotational life specification (50K vs. 25K cycles) provides extended operational capability without functional change.

Q: What is the difference between 25BR18-G-1-20C and 25BR18-G-1-20F?

A: Both parts share identical electrical and mechanical specifications: 20 PPR output, Gray Code absolute encoding, 50K rotational life, and all mounting parameters. The designation suffix (-20C vs. -20F) indicates a variation in part configuration not detailed in the provided parameters. Consult Grayhill documentation for specific configuration differences.

Q: Can the 16 PPR parts (25BSP22-G-1-08 or 25BSR22-G-1-16C) replace the 20 PPR primary part?

A: Substitution with 16 PPR parts is possible only if the application design permits reduced angular resolution. The 16 PPR output provides 4 fewer pulses per revolution than the 20 PPR specification. System firmware and mechanical design must accommodate this resolution change. Direct substitution without design review is not recommended.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, matching the compliance status of the primary part 20SG2AC-G2AC-P.

Q: What is the significance of the rotational life difference (25K vs. 50K cycles)?

A: The primary part specifies a minimum rotational life of 25K cycles. All substitute parts provide 50K cycle minimum rating, representing a 2x improvement in mechanical durability. This enhanced specification is acceptable for any application requiring the original 25K cycle rating and beneficial for extended-duty applications.

Q: Are the Series 20 and Series 25 encoders mechanically interchangeable?

A: Yes, for the specified parameters. Both series maintain identical actuator type (1/4" diameter flatted end), mounting configuration (PCB through-hole), orientation (right angle), and termination style (PC pin). Series designation reflects product family evolution; mechanical and electrical interfaces remain compatible.

Q: What inventory considerations apply to substitute selection?

A: Current inventory levels are: 20SG2AC-G2AC-P (719 Pcs), 25BR18-G-1-20C (1082 Pcs), 25BR18-G-1-20F (781 Pcs), 25BSP22-G-1-08 (1018 Pcs), and 25BSR22-G-1-16C (1188 Pcs). All substitute parts maintain higher stock levels than the primary part, supporting supply chain continuity.