Grayhill Inc. 513374-9 Rotary Encoder Mechanical 9PPR Equivalent & Substitute Parts

Part Overview

The Grayhill Inc. 513374-9 is a mechanical rotary encoder with 9 pulses per revolution (PPR) output in BCD (Absolute) format. This vertical-orientation encoder features a 1/8" diameter flatted end actuator and is designed for panel and PCB through-hole mounting applications. The part is currently in active production status with 1134 units available in new original inventory. Alternative part numbers within the same product family may be required when specific pulse-per-revolution requirements differ from the 9PPR specification or when inventory constraints necessitate substitution.

Substiute Parts

513374-9

Grayhill Inc.In Stock: 1211513374-9 Datasheet

Current PartRFQ

513374-8

Grayhill Inc.In Stock: 944513374-8 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 513374-9 is determined by the following critical parameters that must remain constant across equivalent parts:

Fixed Parameters (Non-Negotiable for Substitution):

• Encoder Type: Mechanical
• Output Type: BCD (Absolute)
• Actuator Type: 1/8" Dia Flatted End
• Detent: Yes
• Built-in Switch: No
• Mounting Type: Panel, PCB Through Hole
• Orientation: Vertical
• Termination Style: PC Pin
• Rotational Life: 25K cycles minimum
• Manufacturer: Grayhill Inc.
• Series: 51

Variable Parameter (Allows Substitution):

• Pulses per Revolution (PPR): The 513374-9 specifies 9PPR. Alternative models within the same product family may feature different PPR values (such as 8PPR) while maintaining all other electrical and mechanical characteristics.

The 513374-8 qualifies as a substitute part because it maintains identical specifications across all fixed parameters while differing only in the PPR value (8PPR versus 9PPR). This substitution is valid only when the application circuit or system design can accommodate the alternative pulse resolution.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection (513374-9): The 513374-9 is the specified part for applications requiring 9 pulses per revolution resolution. This part maintains active production status with robust inventory availability (1134 units). RoHS compliance and REACH unaffected status confirm regulatory alignment for current manufacturing standards.

Substitute Selection (513374-8): The 513374-8 serves as a functional substitute when 8 pulses per revolution resolution is acceptable within the application circuit design. This part is also in active production with adequate inventory (904 units) and meets identical compliance requirements. The ROHS3 designation on the 513374-8 represents the current RoHS standard iteration, while the 513374-9 carries the earlier RoHS Compliant designation; both are acceptable for new designs.

Selection Criteria:

• Use 513374-9 when the application circuit specifically requires 9PPR resolution
• Use 513374-8 when the application can function with 8PPR resolution or when inventory of the primary part is constrained
• Both parts share identical mechanical mounting, electrical termination, and reliability characteristics (25K cycle minimum life)
• Both parts are suitable for panel and PCB through-hole mounting in vertical orientation
• Regulatory compliance is equivalent across both parts for RoHS and REACH requirements

Frequently Asked Questions (FAQ)

Q: Can the 513374-8 be used as a direct replacement for the 513374-9?

A: The 513374-8 is mechanically and electrically compatible with the 513374-9 in all aspects except pulses per revolution (8PPR versus 9PPR). Direct substitution is possible only if the receiving circuit or system design can accommodate the different pulse resolution. The BCD (Absolute) output format remains identical, and all mounting, termination, and reliability specifications are equivalent.

Q: What is the difference between RoHS Compliant and ROHS3 Compliant designations?

A: Both designations indicate compliance with RoHS (Restriction of Hazardous Substances) regulations. ROHS3 represents the current iteration of the RoHS standard. Both the 513374-9 (RoHS Compliant) and 513374-8 (ROHS3 Compliant) meet regulatory requirements for hazardous substance restrictions. The ROHS3 designation on the 513374-8 reflects more recent certification documentation.

Q: Are there any differences in packaging between these parts?

A: The 513374-9 is specified with packaging designation "-" (not explicitly defined in available data). The 513374-8 is packaged in Bulk format. Packaging differences do not affect electrical or mechanical compatibility; they relate only to order quantity and shipping configuration.

Q: What does BCD (Absolute) output mean?

A: BCD (Binary Coded Decimal) Absolute output means the encoder provides a direct digital representation of its current angular position in BCD format. Unlike incremental encoders that output pulses, absolute encoders output the actual position value, which remains valid even after power loss or without continuous rotation monitoring.

Q: Can these encoders be used in applications requiring high-speed rotation?

A: The specified rotational life is 25K cycles minimum, which defines mechanical durability. The 9PPR and 8PPR specifications indicate pulse resolution per complete revolution. High-speed compatibility depends on the receiving circuit's ability to process the pulse frequency generated at the intended rotational speed. No maximum RPM specification is provided in the available parameters.

Q: Are these parts suitable for industrial control applications?

A: Both the 513374-9 and 513374-8 are mechanical rotary encoders with detent positioning, PC pin termination, and panel/PCB through-hole mounting. These characteristics are typical for industrial control, instrumentation, and measurement applications. RoHS compliance and REACH unaffected status confirm suitability for current industrial manufacturing standards.

Q: What does the 1/8" Dia Flatted End actuator specification mean?

A: The actuator is the rotating shaft interface. The 1/8" diameter specification defines the shaft size. The "Flatted End" designation indicates the shaft has a flat surface (rather than being fully round), which allows positive engagement with a mating component such as a knob or coupling that has a corresponding flat surface or set screw.