Grayhill 25LB18-Q-Z Rotary Encoder Mechanical 20PPR Equivalent & Substitute Parts

Part Overview

The Grayhill 25LB18-Q-Z is an active mechanical rotary encoder with 20 pulses per revolution (PPR) output in quadrature (incremental) format. This vertical-orientation encoder features a 1/4" diameter flatted end actuator, detent mechanism, and PC pin termination for panel and PCB through-hole mounting applications. The part maintains active product status with 862 units in current inventory. Substitute parts within the 25L series provide alternative pulse-per-revolution configurations while maintaining identical mechanical, electrical, and compliance characteristics, enabling selection based on specific application resolution requirements.

Substiute Parts

25LB18-Q-Z

Grayhill Inc.In Stock: 95025LB18-Q-Z Datasheet

Current PartRFQ

25LB18-Q

Grayhill Inc.In Stock: 104925LB18-Q Datasheet

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25LB22-Q

Grayhill Inc.In Stock: 202525LB22-Q Datasheet

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25LB30-Q

Grayhill Inc.In Stock: 113825LB30-Q Datasheet

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25LB45-Q

Grayhill Inc.In Stock: 111925LB45-Q Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution within the Grayhill 25L series is determined by the following fixed parameters that remain constant across all equivalent parts:

Invariant Parameters (Must Match for Substitution):

• Encoder Type: Mechanical
• Output Type: Quadrature (Incremental)
• Actuator Type: 1/4" Dia Flatted End
• Detent: Yes
• Built-in Switch: No
• Mounting Type: Panel, PCB Through Hole
• Orientation: Vertical
• Termination Style: PC Pin
• Rotational Life: 100K cycles minimum
• RoHS Status: RoHS3 Compliant
• Moisture Sensitivity Level: 1 (Unlimited)
• REACH Status: REACH Unaffected

Variable Parameter (Differentiates Substitutes):

• Pulses per Revolution (PPR): 8, 12, 16, 20

The 25LB18-Q-Z (20 PPR) can be substituted with 25LB18-Q, 25LB22-Q (16 PPR), 25LB30-Q (12 PPR), or 25LB45-Q (8 PPR) based on application-specific resolution requirements. All parts share identical mechanical form factor, electrical interface characteristics, and regulatory compliance.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection (25LB18-Q): Direct equivalent to 25LB18-Q-Z with identical 20 PPR specification. Differs only in packaging (Bulk vs. standard) and RoHS certification level (ROHS3 vs. RoHS Compliant). Both maintain active product status and full regulatory compliance. Selection between these two depends on packaging requirements and RoHS revision compatibility.

Alternative Selections by Resolution Requirement:

25LB22-Q (16 PPR): Suitable for applications requiring lower angular resolution than 20 PPR. Maintains all mechanical and electrical interface characteristics. Highest inventory availability (1987 units). Select when application resolution tolerance permits 16 PPR output.

25LB30-Q (12 PPR): Suitable for applications requiring 12 PPR resolution. Maintains identical form factor and interface. Select when application resolution tolerance permits 12 PPR output.

25LB45-Q (8 PPR): Suitable for applications requiring lowest resolution at 8 PPR. Maintains identical mechanical mounting and electrical interface. Select when application resolution tolerance permits 8 PPR output.

All substitute parts maintain:

• Active product status
• 100K minimum rotational life cycles
• RoHS3 compliance
• REACH unaffected status
• Identical mechanical form factor and mounting compatibility
• Identical electrical interface (quadrature incremental output)
• Unlimited moisture sensitivity rating

Frequently Asked Questions (FAQ)

Q: Can 25LB18-Q-Z be directly replaced with 25LB18-Q?

A: Yes. Both parts are identical in all electrical and mechanical specifications. The difference is packaging type (standard vs. Bulk) and RoHS certification revision level. Both are active products with full regulatory compliance.

Q: What determines compatibility when selecting a substitute encoder from the 25L series?

A: Compatibility is determined by matching the following fixed parameters: mechanical encoder type, quadrature incremental output format, 1/4" flatted end actuator, detent mechanism, panel and PCB through-hole mounting capability, vertical orientation, PC pin termination, and 100K rotational life minimum. The pulses per revolution (PPR) specification is the only variable parameter among compatible substitutes.

Q: Can I use 25LB22-Q (16 PPR) instead of 25LB18-Q-Z (20 PPR)?

A: Substitution is possible only if your application can operate with 16 PPR resolution instead of 20 PPR. All other mechanical, electrical, and compliance characteristics are identical. Verify that your system firmware or hardware can accept the lower resolution output before substitution.

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

A: Both designations indicate RoHS compliance. ROHS3 refers to the third revision of the RoHS directive. Both 25LB18-Q-Z and substitute parts meet current RoHS requirements. Selection between them depends on your specific regulatory documentation requirements.

Q: Are all 25L series encoders mechanically interchangeable?

A: Yes, all 25L series encoders listed share identical mechanical form factor, actuator type, mounting configuration, and orientation. They differ only in PPR specification. Physical installation and mounting are identical across all variants.

Q: Which substitute part has the highest inventory availability?

A: 25LB22-Q (16 PPR) has the highest inventory with 1987 units in stock, followed by 25LB45-Q (1024 units) and 25LB30-Q (1060 units).

Q: Do all substitute parts have the same rotational life rating?

A: Yes. All parts in the 25L series maintain a minimum rotational life of 100K cycles, ensuring equivalent mechanical durability across all PPR variants.

Q: What packaging options are available?

A: 25LB18-Q-Z is supplied in standard packaging with 862 units in inventory. 25LB18-Q and all other substitutes are supplied in Bulk packaging with higher inventory levels.