Grayhill 63RS256 Optical Rotary Encoder Equivalent & Substitute Parts

Part Overview

The Grayhill 63RS256 is an optical rotary encoder with 256 pulses per revolution, delivering quadrature (incremental) output for precision motion control and position feedback applications. This vertical-mount, through-hole component operates at 5V supply voltage with a 1/4" diameter flatted end actuator. The encoder is ROHS3 compliant, REACH unaffected, and maintains an active product status with 300 million cycle rotational life rating. Substitute parts are identified to address application requirements for alternative pulse resolutions while maintaining electrical and mechanical compatibility within the 63R and compatible series families.

Substiute Parts

63RS256

Grayhill Inc.In Stock: 113763RS256 Datasheet

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63R128

Grayhill Inc.In Stock: 167263R128 Datasheet

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63R256

Grayhill Inc.In Stock: 124663R256 Datasheet

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63R32

Grayhill Inc.In Stock: 105863R32 Datasheet

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63R64

Grayhill Inc.In Stock: 138963R64 Datasheet

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63RS64

Grayhill Inc.In Stock: 95263RS64 Datasheet

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HRPG-ASCA#16R

Broadcom LimitedIn Stock: 1256HRPG-ASCA#16R Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 63RS256 are selected based on strict electrical and mechanical parameter compatibility. All substitute candidates maintain the following core parameters identical to the main part:

Fixed Parameters (Must Match for Substitution):

• Encoder Type: Optical
• Output Type: Quadrature (Incremental)
• Voltage Supply: 5V
• Actuator Type: 1/4" Dia Flatted End
• Mounting Type: PCB, Through Hole
• Orientation: Vertical
• Termination Style: PC Pin
• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level: 1 (Unlimited)
• REACH Status: REACH Unaffected

Variable Parameter (Substitution Basis):

• Pulses per Revolution (PPR): Varies by application requirement

Substitute parts are grouped into two categories:

Category 1: Grayhill 63R Series (Same Manufacturer, Same Series) Parts 63R128, 63R256, 63R32, 63R64, and 63RS64 are direct substitutes within the Grayhill 63R family. These maintain identical electrical and mechanical specifications with PPR variations of 32, 64, 128, and 256. All share 300M rotational life cycles and identical compliance certifications.

Category 2: Cross-Manufacturer Substitute Part HRPG-ASCA#16R (Broadcom Limited, HRPG series) provides optical quadrature output at 120 PPR with identical mounting, orientation, and electrical parameters. This part differs in rotational life specification (1M cycles versus 300M cycles) and represents a cross-manufacturer alternative.

Parameter Comparison

Engineering Selection Recommendations

Grayhill 63R Series Substitutes (63R128, 63R256, 63R32, 63R64, 63RS64)

These parts are direct substitutes within the Grayhill 63R optical encoder family. All maintain identical electrical specifications (5V supply), mechanical mounting (PCB through-hole, vertical orientation, 1/4" flatted end actuator), and compliance certifications (ROHS3, REACH unaffected). Selection among these parts is determined solely by the required pulse resolution for the application:

• 63R32: 32 PPR for low-resolution position feedback
• 63R64 / 63RS64: 64 PPR for standard-resolution applications
• 63R128: 128 PPR for medium-resolution applications
• 63R256 / 63RS256: 256 PPR for high-resolution position feedback

All Grayhill 63R variants provide 300 million cycle rotational life and are suitable for continuous industrial motion control applications.

Broadcom HRPG-ASCA#16R Cross-Manufacturer Substitute

The HRPG-ASCA#16R provides optical quadrature output at 120 PPR with identical electrical and mechanical interface specifications. This part is suitable for applications requiring intermediate pulse resolution between 64 and 128 PPR. The primary engineering consideration is the reduced rotational life specification (1 million cycles versus 300 million cycles for Grayhill 63R parts), which limits application to lower-duty-cycle or non-continuous operation scenarios. All compliance certifications (ROHS3, REACH unaffected) are equivalent to the main part.

Selection Criteria Summary

• Pulse Resolution Requirement: Select PPR value matching application encoder resolution specification
• Rotational Life Requirement: Grayhill 63R series (300M cycles) for continuous duty; HRPG-ASCA#16R (1M cycles) for intermittent duty
• Manufacturer Preference: Grayhill 63R series for single-source supply chain; HRPG-ASCA#16R for cross-manufacturer redundancy
• Compliance: All listed parts meet ROHS3 and REACH requirements for regulated markets

Frequently Asked Questions (FAQ)

Q: Can the 63RS256 be replaced with any of the listed substitute parts?

A: Direct replacement depends on application pulse resolution requirements. The 63RS256 (256 PPR) can be replaced with 63R256 (identical specifications) or 63R128 (128 PPR) if lower resolution is acceptable. Parts with different PPR values (32, 64, 120) require application firmware or signal processing adjustment to accommodate the different pulse count per revolution.

Q: What is the difference between 63R256 and 63RS256?

A: Both parts are Grayhill 63R series optical encoders with 256 PPR output. The parameter data provided indicates identical electrical, mechanical, and compliance specifications. Selection between these parts is based on availability and inventory status.

Q: Can the HRPG-ASCA#16R replace the 63RS256 in all applications?

A: The HRPG-ASCA#16R provides electrical and mechanical interface compatibility but differs in two aspects: (1) pulse resolution is 120 PPR instead of 256 PPR, requiring application adjustment; (2) rotational life is 1 million cycles versus 300 million cycles, limiting use to non-continuous duty applications. Cross-manufacturer substitution is suitable only when both conditions are acceptable.

Q: Are all substitute parts PCB through-hole mounted?

A: Yes. All listed substitute parts (63R128, 63R256, 63R32, 63R64, 63RS64, HRPG-ASCA#16R) use PCB through-hole mounting with vertical orientation and PC pin termination, identical to the 63RS256.

Q: What supply voltage do the substitute parts require?

A: All substitute parts operate at 5V supply voltage, identical to the 63RS256. No power supply modification is required for substitution.

Q: Are the substitute parts RoHS and REACH compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, matching the compliance status of the 63RS256. These parts are suitable for regulated markets and applications with environmental compliance requirements.

Q: What is the actuator type for all substitute parts?

A: All substitute parts use a 1/4" diameter flatted end actuator, identical to the 63RS256. Mechanical coupling and shaft interface compatibility is maintained across all listed substitutes.

Q: How does pulse resolution affect encoder selection?

A: Pulse resolution (PPR) determines the angular position granularity. Higher PPR values (256) provide finer position resolution; lower PPR values (32, 64) provide coarser resolution. Application firmware must be configured to process the selected PPR value. Substitution with different PPR requires application validation.

Q: Is the HRPG-ASCA#16R suitable for continuous operation?

A: The HRPG-ASCA#16R is rated for 1 million cycle rotational life, suitable for intermittent or low-duty-cycle applications. For continuous operation, Grayhill 63R series parts (300 million cycle rating) are the appropriate selection.

Q: What is the moisture sensitivity level for all parts?

A: All listed parts have Moisture Sensitivity Level (MSL) 1 (Unlimited), indicating no moisture sensitivity restrictions. Standard handling and storage procedures apply without special desiccant or humidity control requirements.