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Grayhill 25LB11-Q-Z Rotary Encoder Mechanical 32PPR Equivalent & Substitute Parts
Part Overview
The Grayhill 25LB11-Q-Z is an active mechanical rotary encoder with 32 pulses per revolution (PPR) in quadrature (incremental) output configuration. 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 is ROHS3 compliant and REACH unaffected, with a minimum rotational life of 100,000 cycles.
Substitute parts are identified when equivalent mechanical encoders share the same core functional characteristics: mechanical encoder type, quadrature output, vertical orientation, 1/4" flatted end actuator, detent operation, PC pin termination, and compatible mounting methods. Alternative models may differ in pulses per revolution or rotational life specifications while maintaining electrical and mechanical compatibility within the 25L series or equivalent cross-manufacturer alternatives.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | 25LB11-Q-Z |
| Manufacturer | Grayhill Inc. |
| Series | 25L |
| Encoder Type | Mechanical |
| Output Type | Quadrature (Incremental) |
| Pulses per Revolution | 32 |
| 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 (Cycles Min) | 100K |
| Product Status | Active |
| RoHS Status | ROHS3 Compliant |
| REACH Status | REACH Unaffected |
Substitute Part Grouping Explanation
Substitute parts for the 25LB11-Q-Z are classified into two categories based on substitution criteria:
Category 1: Same PPR (32 Pulses per Revolution) - Direct Substitutes
The 25LB11-Q shares identical specifications with the main part except for termination designation suffix. This part maintains 32 PPR output, identical mechanical construction, and all core electrical parameters.
Category 2: Alternative PPR within 25L Series - Functional Alternatives
Parts 25LB15-Q, 25LB15-Q-Z, 25LB18-Q, 25LB22-Q, 25LB30-Q, and 25LB45-Q are mechanical encoders within the Grayhill 25L series that share the following compatible parameters:
- Mechanical encoder type
- Quadrature (incremental) output
- Vertical orientation
- 1/4" diameter flatted end actuator
- Detent mechanism
- PC pin termination
- Panel and PCB through-hole mounting compatibility
- 100,000 cycle minimum rotational life
- ROHS3 compliance and REACH unaffected status
These alternatives differ only in pulses per revolution specification (24, 20, 16, 12, or 8 PPR respectively), which affects resolution but not mechanical or electrical interface compatibility.
Category 3: Cross-Manufacturer Alternative
The Bourns ECW1D-C24-BC0024L is a mechanical encoder from an alternative manufacturer that shares mechanical and electrical interface characteristics with the main part. This part operates at 24 PPR with enhanced rotational life (200,000 cycles minimum) and maintains all other compatible parameters.
Parameter Comparison
| Parameter | 25LB11-Q-Z (Main) | 25LB11-Q | 25LB15-Q | 25LB15-Q-Z | 25LB18-Q | 25LB22-Q | 25LB30-Q | 25LB45-Q | ECW1D-C24-BC0024L |
|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | Grayhill Inc. | Grayhill Inc. | Grayhill Inc. | Grayhill Inc. | Grayhill Inc. | Grayhill Inc. | Grayhill Inc. | Grayhill Inc. | Bourns Inc. |
| Series | 25L | 25L | 25L | 25L | 25L | 25L | 25L | 25L | ECW |
| Encoder Type | Mechanical | Mechanical | Mechanical | Mechanical | Mechanical | Mechanical | Mechanical | Mechanical | Mechanical |
| Output Type | Quadrature (Incremental) | Quadrature (Incremental) | Quadrature (Incremental) | Quadrature (Incremental) | Quadrature (Incremental) | Quadrature (Incremental) | Quadrature (Incremental) | Quadrature (Incremental) | Quadrature (Incremental) |
| Pulses per Revolution | 32 | 32 | 24 | 24 | 20 | 16 | 12 | 8 | 24 |
| Actuator Type | 1/4" Dia Flatted End | 1/4" Dia Flatted End | 1/4" Dia Flatted End | 1/4" Dia Flatted End | 1/4" Dia Flatted End | 1/4" Dia Flatted End | 1/4" Dia Flatted End | 1/4" Dia Flatted End | 1/4" Dia Flatted End |
| Detent | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Built in Switch | No | No | No | No | No | No | No | No | No |
| Mounting Type | Panel, PCB Through Hole | Panel, PCB Through Hole | Panel, PCB Through Hole | Panel, PCB Through Hole | Panel, PCB Through Hole | Panel, PCB Through Hole | Panel, PCB Through Hole | Panel, PCB Through Hole | Panel, PCB Through Hole |
| Orientation | Vertical | Vertical | Vertical | Vertical | Vertical | Vertical | Vertical | Vertical | Vertical |
| Termination Style | PC Pin | PC Pin | PC Pin | PC Pin | PC Pin | PC Pin | PC Pin | PC Pin | PC Pin |
| Rotational Life (Cycles Min) | 100K | 100K | 100K | 100K | 100K | 100K | 100K | 100K | 200K |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| REACH Status | REACH Unaffected | REACH Unaffected | REACH Unaffected | REACH Unaffected | REACH Unaffected | REACH Unaffected | REACH Unaffected | REACH Unaffected | REACH Unaffected |
Engineering Selection Recommendations
Direct Substitution (Same Resolution)
The 25LB11-Q is the direct equivalent to the 25LB11-Q-Z, differing only in termination designation. Both parts maintain 32 PPR output and are suitable for applications requiring this specific resolution. Both are active products with ROHS3 compliance and REACH unaffected status.
Alternative Resolution Selection (25L Series)
When application requirements allow for alternative pulse-per-revolution specifications, the following 25L series encoders provide equivalent mechanical and electrical interface compatibility:
- 25LB15-Q or 25LB15-Q-Z: 24 PPR alternative
- 25LB18-Q: 20 PPR alternative
- 25LB22-Q: 16 PPR alternative
- 25LB30-Q: 12 PPR alternative
- 25LB45-Q: 8 PPR alternative
All 25L series alternatives maintain 100,000 cycle minimum rotational life, ROHS3 compliance, and REACH unaffected status. Selection among these alternatives depends on the required encoder resolution for the specific application.
Cross-Manufacturer Alternative
The Bourns ECW1D-C24-BC0024L provides a cross-manufacturer option with 24 PPR output and enhanced rotational life specification (200,000 cycles minimum). This part maintains mechanical and electrical interface compatibility with the main part and is ROHS3 compliant and REACH unaffected. The ECW1D-C24-BC0024L is suitable for applications requiring extended operational life or cross-vendor qualification.
All substitute parts listed are active products with confirmed inventory availability and meet the same regulatory compliance standards as the main part.
Frequently Asked Questions (FAQ)
Q: Can the 25LB11-Q be used as a direct replacement for the 25LB11-Q-Z?
A: Yes. The 25LB11-Q is a direct substitute with identical electrical and mechanical specifications. The difference in part number suffix does not affect functional compatibility or performance characteristics.
Q: What determines whether a substitute encoder from the 25L series is compatible?
A: Compatibility is determined by matching the following parameters: mechanical encoder type, quadrature output configuration, vertical orientation, 1/4" flatted end actuator, detent mechanism, PC pin termination, and panel/PCB through-hole mounting capability. Pulses per revolution may differ based on application resolution requirements.
Q: Can I use a 24 PPR encoder (25LB15-Q) in place of the 32 PPR encoder (25LB11-Q-Z)?
A: The 25LB15-Q shares all mechanical and electrical interface characteristics with the 25LB11-Q-Z. However, the difference in resolution (24 PPR versus 32 PPR) affects the encoder output frequency and position resolution. Substitution is only appropriate if the application can accommodate the lower resolution specification.
Q: What is the difference between the Grayhill 25L series and the Bourns ECW1D series encoders?
A: Both series share identical mechanical and electrical interface specifications including actuator type, mounting method, termination style, and output configuration. The primary difference is the rotational life specification: Grayhill 25L series encoders are rated for 100,000 cycles minimum, while the Bourns ECW1D-C24-BC0024L is rated for 200,000 cycles minimum. Both are ROHS3 compliant and REACH unaffected.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All substitute parts listed in this reference are ROHS3 compliant and REACH unaffected, matching the regulatory status of the main part 25LB11-Q-Z.
Q: What is the significance of the "-Z" suffix in the part number 25LB11-Q-Z?
A: The "-Z" suffix indicates a specific termination or packaging designation variant. The 25LB11-Q (without the "-Z" suffix) is functionally equivalent and serves as a direct substitute.
Q: Can the ECW1D-C24-BC0024L be used in applications originally designed for the 25LB11-Q-Z?
A: The ECW1D-C24-BC0024L maintains mechanical and electrical interface compatibility with the 25LB11-Q-Z. However, the difference in pulses per revolution (24 PPR versus 32 PPR) and the enhanced rotational life specification (200,000 cycles versus 100,000 cycles) must be evaluated against specific application requirements before substitution.
Q: What mounting options are available for these encoders?
A: All listed encoders support both panel mounting and PCB through-hole mounting configurations with vertical orientation and PC pin termination.
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