Grayhill 61RS256 Rotary Encoder Optical 256PPR: Equivalent & Substitute Parts

Part Overview

The Grayhill 61RS256 is an optical rotary encoder with 256 pulses per revolution (PPR), delivering quadrature (incremental) output. This vertical-orientation encoder operates at 5V supply voltage and features a 1/4" diameter flatted-end actuator with PC pin termination for panel and PCB through-hole mounting. The 61RS256 is classified as Active product status with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1). With 942 units in current inventory, this encoder is suitable for precision rotational measurement and motion control applications requiring high-resolution position feedback.

Substitute parts are necessary when the 61RS256 becomes unavailable, when alternative resolution requirements emerge, or when design specifications permit operation with different pulse-per-revolution ratings while maintaining core electrical and mechanical compatibility.

Substiute Parts

61RS256

Grayhill Inc.In Stock: 95661RS256 Datasheet

Current PartRFQ

61K128

Grayhill Inc.In Stock: 113761K128 Datasheet

SimilarRFQ

61K64

Grayhill Inc.In Stock: 70661K64 Datasheet

SimilarRFQ

61KS256

Grayhill Inc.In Stock: 104761KS256 Datasheet

SimilarRFQ

61R128

Grayhill Inc.In Stock: 113161R128 Datasheet

SimilarRFQ

61R256

Grayhill Inc.In Stock: 130561R256 Datasheet

SimilarRFQ

61R64

Grayhill Inc.In Stock: 80061R64 Datasheet

SimilarRFQ

EM14A0D-C24-L032N

Bourns Inc.In Stock: 1184EM14A0D-C24-L032N Datasheet

SimilarRFQ

EM14A0D-C24-L064N

Bourns Inc.In Stock: 904EM14A0D-C24-L064N Datasheet

SimilarRFQ

HRPG-ASCA#19F

Broadcom LimitedIn Stock: 1186HRPG-ASCA#19F Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 61RS256 is determined by strict adherence to the following core parameters:

Primary Compatibility Criteria:

• Encoder Type: Optical
• Output Type: Quadrature (Incremental)
• Voltage - Supply: 5V
• Actuator Type: 1/4" Dia Flatted End
• Mounting Type: Panel, PCB Through Hole
• Orientation: Vertical
• Termination Style: PC Pin

Secondary Consideration:

• Pulses per Revolution: Substitutes may vary from 256 PPR if system design permits alternative resolution values

Substitute parts are grouped into two categories:

Category 1: Grayhill Series 61R and 61K (Same Manufacturer) These encoders maintain identical electrical specifications (5V supply, quadrature output, optical type) and mechanical form factors (1/4" flatted actuator, vertical orientation, PC pin termination, panel/PCB mounting). Variations exist only in PPR ratings (64, 128, 256) and series designation. All Grayhill substitutes carry 10M rotational life cycles and ROHS3 compliance.

Category 2: Cross-Manufacturer Alternatives (Bourns EM14 Series, Broadcom HRPG Series) These encoders share identical electrical and mechanical interfaces but originate from different manufacturers. Bourns EM14A0D variants offer 32 and 64 PPR options with 1M rotational life cycles. Broadcom HRPG-ASCA#19F provides 120 PPR with 1M rotational life cycles. Both maintain 5V supply, quadrature output, optical type, and matching mechanical form factors.

Parameter Comparison

Engineering Selection Recommendations

Grayhill 61R and 61K Series (Primary Substitutes)

The Grayhill 61R256, 61R128, 61R64, 61KS256, 61K128, and 61K64 encoders are direct mechanical and electrical substitutes for the 61RS256. All maintain identical 5V supply voltage, quadrature output format, optical sensing technology, 1/4" flatted actuator geometry, vertical orientation, PC pin termination, and panel/PCB through-hole mounting compatibility. All Grayhill variants carry Active product status, ROHS3 compliance, and 10M rotational life cycles.

Selection among Grayhill alternatives depends solely on required PPR rating. The 61R256 and 61KS256 provide identical 256 PPR resolution to the 61RS256. The 61R128 and 61K128 offer 128 PPR for applications tolerating reduced resolution. The 61R64 and 61K64 provide 64 PPR for lower-resolution requirements.

Bourns EM14A0D Series (Cross-Manufacturer Alternatives)

The Bourns EM14A0D-C24-L064N and EM14A0D-C24-L032N encoders maintain identical electrical and mechanical interfaces but differ in rotational life specification (1M cycles versus 10M cycles for Grayhill). Both are ROHS3 compliant and Active status. The EM14A0D-C24-L064N provides 64 PPR; the EM14A0D-C24-L032N provides 32 PPR. These substitutes are suitable for applications where 1M rotational life cycles satisfy operational requirements.

Broadcom HRPG Series (Cross-Manufacturer Alternative)

The Broadcom HRPG-ASCA#19F encoder maintains identical electrical and mechanical interfaces with 120 PPR output. Rotational life is specified at 1M cycles. This encoder is ROHS3 compliant and Active status. Selection of this substitute is appropriate for applications requiring 120 PPR resolution and tolerating 1M rotational life cycles.

Frequently Asked Questions (FAQ)

Q: Can the 61RS256 be directly replaced with the 61R256 or 61KS256?

A: Yes. The 61R256 and 61KS256 are direct substitutes. All three encoders share identical electrical specifications (5V supply, quadrature output, optical type), mechanical form factors (1/4" flatted actuator, vertical orientation, PC pin termination, panel/PCB mounting), and rotational life (10M cycles). The only difference is series designation (61R versus 61K).

Q: What is the impact of selecting a lower PPR encoder such as the 61R128 or 61R64?

A: Lower PPR encoders produce fewer pulses per complete shaft rotation. The 61R128 generates 128 pulses per revolution (half the 61RS256 resolution), and the 61R64 generates 64 pulses per revolution (one-quarter the 61RS256 resolution). System firmware or controller logic must accommodate the reduced resolution. Mechanical and electrical compatibility remains unchanged.

Q: Are Bourns EM14A0D encoders compatible with the 61RS256?

A: Bourns EM14A0D encoders are mechanically and electrically compatible. Both EM14A0D-C24-L064N (64 PPR) and EM14A0D-C24-L032N (32 PPR) maintain 5V supply voltage, quadrature output, optical type, 1/4" flatted actuator, vertical orientation, PC pin termination, and panel/PCB through-hole mounting. The critical difference is rotational life: Bourns EM14 series specifies 1M cycles versus 10M cycles for Grayhill 61R/61K series.

Q: Is the Broadcom HRPG-ASCA#19F a suitable substitute?

A: The Broadcom HRPG-ASCA#19F is mechanically and electrically compatible with identical 5V supply, quadrature output, optical type, 1/4" flatted actuator, vertical orientation, PC pin termination, and panel/PCB through-hole mounting. The encoder provides 120 PPR output. Rotational life is specified at 1M cycles. Selection depends on whether 120 PPR resolution and 1M rotational life cycles satisfy application requirements.

Q: What compliance certifications apply to all substitute options?

A: All listed substitute parts carry ROHS3 compliance and Active product status. Grayhill 61R and 61K series encoders are REACH Unaffected. Bourns EM14A0D series encoders are REACH Affected. Broadcom HRPG-ASCA#19F is REACH Unaffected. All encoders are classified under ECCN EAR99 and HTSUS 8543.70.4500.

Q: Can packaging format differ between the 61RS256 and substitute parts?

A: All listed parts are supplied in Bulk packaging format. No packaging format variations exist among the primary substitutes.

Q: What is the moisture sensitivity rating for cross-manufacturer substitutes?

A: Grayhill 61R and 61K series encoders carry MSL 1 (Unlimited). Bourns EM14A0D series encoders carry MSL Not Applicable. Broadcom HRPG-ASCA#19F carries MSL 1 (Unlimited). These ratings reflect manufacturer specifications and do not affect mechanical or electrical compatibility.