Grayhill 61S64-2 Rotary Encoder Optical 64PPR Equivalent & Substitute Parts

Part Overview

The Grayhill 61S64-2 is an optical rotary encoder with 64 pulses per revolution (PPR), delivering quadrature (incremental) output at 5V supply voltage. This component features a 1/4" diameter flatted end actuator, detent mechanism, vertical PCB through-hole mounting, and PC pin termination. The 61S64-2 is classified as obsolete; however, 764 pieces remain in new original stock.

Due to the obsolete product status, identifying equivalent and substitute parts is essential for design continuity, procurement planning, and long-term system reliability. Substitute encoders must maintain compatibility across electrical specifications, mechanical form factors, and output characteristics to ensure direct or minimal-modification integration into existing applications.

Key Parameters

Parameter	Value	Substitution Relevance
Encoder Type	Optical	Core technology; substitutes must be optical
Output Type	Quadrature (Incremental)	Signal format; must match for circuit compatibility
Pulses per Revolution (PPR)	64	Resolution; critical for motion control and position tracking
Voltage - Supply	5V	Power requirement; must match system supply
Actuator Type	1/4" Dia Flatted End	Mechanical interface; determines shaft compatibility
Detent	Yes	Tactile feedback; affects user experience and mechanical behavior
Mounting Type	PCB, Through Hole	Board integration; must match PCB layout
Orientation	Vertical	Physical placement; determines spatial requirements
Termination Style	PC Pin	Electrical connection; must be compatible with board receptacles
Rotational Life (Cycles Min)	10M	Durability specification; minimum operational cycles
RoHS Status	RoHS Compliant	Regulatory compliance; required for many applications
Moisture Sensitivity Level (MSL)	1 (Unlimited)	Storage and handling requirements

Substitute Part Grouping Explanation

Substitution logic for the 61S64-2 is based on the following critical parameters:

Primary Substitution Criteria (Must Match):

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

Secondary Substitution Criteria (Preferred Match):

Pulses per Revolution: 64 PPR (exact match preferred for resolution compatibility)
Detent: Yes (functional equivalence)
Rotational Life: 10M cycles minimum (performance baseline)

Compliance Criteria:

RoHS Status: RoHS Compliant or ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

The substitute parts listed below are grouped by PPR resolution. The 61SS64-2 provides the closest direct equivalent with identical 64 PPR specification and active product status. Lower-resolution alternatives (32 PPR, 24 PPR, 20 PPR, 16 PPR, 12 PPR) are suitable only when application requirements permit reduced resolution.

Parameter Comparison

Part Number	Manufacturer	Series	PPR	Output Type	Supply Voltage	Actuator	Detent	Mounting	Orientation	Termination	Rotational Life	Product Status	RoHS Status	Inventory
61S64-2	Grayhill Inc.	61S	64	Quadrature (Incremental)	5V	1/4" Dia Flatted End	Yes	PCB, Through Hole	Vertical	PC Pin	10M	Obsolete	RoHS Compliant	764 Pcs
61SS64-2	Grayhill Inc.	61S	64	Quadrature (Incremental)	5V	1/4" Dia Flatted End	Yes	PCB, Through Hole	Vertical	PC Pin	10M	Active	RoHS Compliant	689 Pcs
62AG11-L0-P	Grayhill Inc.	62AG	32	Quadrature (Incremental)	5V	1/4" Dia Flatted End	Yes	PCB, Through Hole	Vertical	PC Pin	1M	Active	ROHS3 Compliant	951 Pcs
62AG18-L0-P	Grayhill Inc.	62AG	20	Quadrature (Incremental)	5V	1/4" Dia Flatted End	Yes	PCB, Through Hole	Vertical	PC Pin	1M	Active	ROHS3 Compliant	1095 Pcs
62D11-01-P	Grayhill Inc.	62D	32	Quadrature (Incremental)	5V	1/4" Dia Flatted End	Yes	PCB, Through Hole	Vertical	PC Pin	1M	Active	ROHS3 Compliant	682 Pcs
62D22-01-P	Grayhill Inc.	62D	16	Quadrature (Incremental)	5V	1/4" Dia Flatted End	Yes	PCB, Through Hole	Vertical	PC Pin	1M	Active	ROHS3 Compliant	997 Pcs
62D30-01-P	Grayhill Inc.	62D	12	Quadrature (Incremental)	5V	1/4" Dia Flatted End	Yes	PCB, Through Hole	Vertical	PC Pin	1M	Active	ROHS3 Compliant	1166 Pcs
62F11-01-P-L	Grayhill Inc.	62F	32	Quadrature (Incremental)	5V	1/4" Dia Flatted End	Yes	PCB, Through Hole	Vertical	PC Pin	1M	Active	ROHS3 Compliant	941 Pcs
62F15-01-P	Grayhill Inc.	62F	24	Quadrature (Incremental)	5V	1/4" Dia Flatted End	Yes	PCB, Through Hole	Vertical	PC Pin	1M	Active	ROHS3 Compliant	734 Pcs
62F22-01-P-L	Grayhill Inc.	62F	16	Quadrature (Incremental)	5V	1/4" Dia Flatted End	Yes	PCB, Through Hole	Vertical	PC Pin	1M	Active	ROHS3 Compliant	1152 Pcs
62M15-H0-PH	Grayhill Inc.	62M	24	Quadrature (Incremental)	5V	1/4" Dia Flatted End	Yes	PCB, Through Hole	Vertical	PC Pin	1M	Active	ROHS3 Compliant	638 Pcs

Engineering Selection Recommendations

Direct Equivalent (Recommended Primary Substitute):

The 61SS64-2 is the optimal substitute for the 61S64-2. Both parts share identical electrical and mechanical specifications: 64 PPR resolution, 5V supply, quadrature output, 1/4" flatted end actuator, vertical PCB through-hole mounting, and PC pin termination. The 61SS64-2 carries active product status, ensuring long-term availability and supply chain continuity. Both parts maintain RoHS compliance and unlimited moisture sensitivity level (MSL 1). The 61SS64-2 is available in 689 pieces of new original stock, providing immediate procurement capability.

Resolution-Reduced Alternatives (Application-Dependent):

When application requirements permit reduced encoder resolution, the following active alternatives are available:

32 PPR Options: 62AG11-L0-P, 62D11-01-P, 62F11-01-P-L (suitable for applications tolerating 50% resolution reduction)
24 PPR Options: 62F15-01-P, 62M15-H0-PH (suitable for applications tolerating 62.5% resolution reduction)
20 PPR Option: 62AG18-L0-P (suitable for applications tolerating 68.75% resolution reduction)
16 PPR Options: 62D22-01-P, 62F22-01-P-L (suitable for applications tolerating 75% resolution reduction)
12 PPR Option: 62D30-01-P (suitable for applications tolerating 81.25% resolution reduction)

All substitute parts maintain compliance with RoHS (ROHS3 Compliant) and MSL 1 specifications. Rotational life ratings for 62-series alternatives are specified at 1M cycles minimum, compared to the 10M cycles of the 61-series. Selection of lower-resolution alternatives requires verification that motion control algorithms, position tracking accuracy, and system performance remain acceptable within the reduced resolution envelope.

Frequently Asked Questions (FAQ)

Q: Can the 61SS64-2 be used as a direct replacement for the 61S64-2?

A: Yes. The 61SS64-2 is a direct equivalent. Both parts feature identical 64 PPR resolution, 5V supply voltage, quadrature output, 1/4" flatted end actuator, detent mechanism, vertical PCB through-hole mounting, and PC pin termination. The 61SS64-2 is active product status, ensuring continued availability.

Q: What is the primary difference between the 61S64-2 and lower-resolution alternatives?

A: The 61S64-2 provides 64 pulses per revolution. Lower-resolution alternatives (62AG11-L0-P at 32 PPR, 62F15-01-P at 24 PPR, 62D22-01-P at 16 PPR) deliver proportionally fewer pulses per revolution. Resolution reduction directly impacts position tracking accuracy and motion control granularity. Selection of lower-resolution parts requires application-level verification.

Q: Are all substitute parts RoHS compliant?

A: Yes. The 61S64-2 is RoHS Compliant. All listed substitute parts carry either RoHS Compliant or ROHS3 Compliant certification, meeting regulatory requirements for lead-free and restricted substance compliance.

Q: What is the difference in rotational life between the 61S64-2 and 62-series alternatives?

A: The 61S64-2 specifies 10M cycles minimum rotational life. The 62-series alternatives (62AG, 62D, 62F, 62M) specify 1M cycles minimum. The 61-series provides tenfold greater durability. Applications requiring extended operational life should prioritize the 61SS64-2 equivalent or evaluate duty cycle requirements against the 1M cycle specification of 62-series parts.

Q: Are all parts available in the same packaging?

A: No. The 61S64-2 is specified with "-" packaging (standard). The 62AG11-L0-P is packaged in Tube; 62AG18-L0-P, 62D-series, 62F-series, and 62M15-H0-PH are packaged in Bulk. Packaging differences do not affect electrical or mechanical compatibility but may influence procurement quantities and handling procedures.

Q: Can I use a 32 PPR encoder in place of a 64 PPR encoder?

A: Only if application requirements permit 50% resolution reduction. The 32 PPR alternatives (62AG11-L0-P, 62D11-01-P, 62F11-01-P-L) deliver half the pulses per revolution. This affects position tracking accuracy, motion control resolution, and system responsiveness. Substitution requires verification that reduced resolution does not compromise application performance, accuracy specifications, or control algorithms.

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

A: All parts, including the 61S64-2 and all substitutes, carry MSL 1 (Unlimited). This classification indicates no moisture sensitivity restrictions during storage or handling, simplifying procurement and inventory management.

Q: Are the PC pin terminations compatible across all parts?

A: Yes. All parts listed use PC pin termination style, ensuring compatibility with standard PCB receptacles and through-hole mounting procedures. No termination conversion or adapter components are required for direct substitution.

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