Grayhill 25LR11-Q Rotary Encoder Mechanical 32PPR: Equivalent & Substitute Parts

Part Overview

The Grayhill 25LR11-Q is an active mechanical rotary encoder with 32 pulses per revolution (PPR), quadrature output, and vertical orientation. This component is designed for panel and PCB through-hole mounting applications requiring incremental position feedback. The 25LR11-Q features a 1/4" diameter flatted end actuator with detent operation and PC pin termination. Finding equivalent and substitute parts is necessary when the 25LR11-Q is unavailable, when alternative packaging formats are required, or when different pulse-per-revolution specifications are acceptable for system requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	25LR11-Q
Manufacturer	Grayhill Inc.
Series	25L
Encoder Type	Mechanical
Output Type	Quadrature (Incremental)
Pulses per Revolution (PPR)	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
RoHS Status	RoHS Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the 25LR11-Q are grouped based on the following critical parameters that determine functional compatibility:

Primary Compatibility Criteria:

Encoder Type: Mechanical
Output Type: Quadrature (Incremental)
Actuator Type: 1/4" Dia Flatted End
Detent: Yes
Mounting Type: Panel, PCB Through Hole
Orientation: Vertical
Termination Style: PC Pin

Secondary Variation Parameter:

Pulses per Revolution (PPR): Varies by substitute model

Substitutes are divided into two categories:

Category 1: Grayhill 25L Series (Same Manufacturer, Same Series) Parts 25LB11-Q, 25LB15-Q, 25LB15-Q-Z, 25LB18-Q, 25LB22-Q, 25LB30-Q, and 25LB45-Q maintain all primary compatibility criteria but offer different PPR specifications (32, 24, 24, 20, 16, 12, and 8 PPR respectively). These parts share identical mechanical interfaces, mounting characteristics, and electrical output protocols.

Category 2: Cross-Manufacturer Alternative The Bourns ECW1D-C24-BC0024L provides mechanical and electrical compatibility with 24 PPR output. This part maintains all primary compatibility criteria and offers extended rotational life (200K cycles versus 100K cycles).

Parameter Comparison

Part Number	Manufacturer	Series	PPR	Encoder Type	Output Type	Actuator Type	Detent	Mounting Type	Orientation	Termination	Rotational Life (Cycles)	RoHS Status
25LR11-Q	Grayhill Inc.	25L	32	Mechanical	Quadrature (Incremental)	1/4" Dia Flatted End	Yes	Panel, PCB Through Hole	Vertical	PC Pin	100K	RoHS Compliant
25LB11-Q	Grayhill Inc.	25L	32	Mechanical	Quadrature (Incremental)	1/4" Dia Flatted End	Yes	Panel, PCB Through Hole	Vertical	PC Pin	100K	ROHS3 Compliant
25LB15-Q	Grayhill Inc.	25L	24	Mechanical	Quadrature (Incremental)	1/4" Dia Flatted End	Yes	Panel, PCB Through Hole	Vertical	PC Pin	100K	ROHS3 Compliant
25LB15-Q-Z	Grayhill Inc.	25L	24	Mechanical	Quadrature (Incremental)	1/4" Dia Flatted End	Yes	Panel, PCB Through Hole	Vertical	PC Pin	100K	ROHS3 Compliant
25LB18-Q	Grayhill Inc.	25L	20	Mechanical	Quadrature (Incremental)	1/4" Dia Flatted End	Yes	Panel, PCB Through Hole	Vertical	PC Pin	100K	ROHS3 Compliant
25LB22-Q	Grayhill Inc.	25L	16	Mechanical	Quadrature (Incremental)	1/4" Dia Flatted End	Yes	Panel, PCB Through Hole	Vertical	PC Pin	100K	ROHS3 Compliant
25LB30-Q	Grayhill Inc.	25L	12	Mechanical	Quadrature (Incremental)	1/4" Dia Flatted End	Yes	Panel, PCB Through Hole	Vertical	PC Pin	100K	ROHS3 Compliant
25LB45-Q	Grayhill Inc.	25L	8	Mechanical	Quadrature (Incremental)	1/4" Dia Flatted End	Yes	Panel, PCB Through Hole	Vertical	PC Pin	100K	ROHS3 Compliant
ECW1D-C24-BC0024L	Bourns Inc.	ECW	24	Mechanical	Quadrature (Incremental)	1/4" Dia Flatted End	Yes	Panel, PCB Through Hole	Vertical	PC Pin	200K	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalent (Same PPR): The 25LB11-Q is the direct equivalent to the 25LR11-Q. Both parts maintain 32 PPR output and identical mechanical specifications. The 25LB11-Q carries ROHS3 Compliant status compared to the RoHS Compliant designation of the 25LR11-Q, indicating updated compliance documentation. Selection between these parts depends on packaging requirements: 25LR11-Q is supplied in standard packaging, while 25LB11-Q is supplied in bulk packaging.

Alternative PPR Specifications (Grayhill 25L Series): When system requirements permit different pulse-per-revolution specifications, the following Grayhill 25L series parts provide mechanical and electrical compatibility:

25LB15-Q and 25LB15-Q-Z (24 PPR)
25LB18-Q (20 PPR)
25LB22-Q (16 PPR)
25LB30-Q (12 PPR)
25LB45-Q (8 PPR)

All Grayhill 25L series substitutes maintain 100K minimum rotational life cycles and ROHS3 Compliant status.

Cross-Manufacturer Alternative: The Bourns ECW1D-C24-BC0024L provides mechanical and electrical compatibility with 24 PPR output. This part offers extended rotational life of 200K cycles, exceeding the 100K cycle specification of the 25LR11-Q. The ECW1D-C24-BC0024L carries ROHS3 Compliant status and maintains all primary compatibility criteria for mounting, orientation, and termination.

All substitute parts listed maintain REACH Unaffected status and EAR99 ECCN classification consistent with the 25LR11-Q.

Frequently Asked Questions (FAQ)

Q: Can the 25LB11-Q replace the 25LR11-Q in existing designs? A: Yes. The 25LB11-Q is mechanically and electrically identical to the 25LR11-Q, maintaining 32 PPR output and all mounting specifications. The primary difference is packaging format: 25LR11-Q uses standard packaging while 25LB11-Q uses bulk packaging.

Q: What is the significance of different PPR values in the 25L series substitutes? A: Pulses per revolution directly affects the resolution of position feedback. The 25LR11-Q provides 32 PPR. Substitutes with lower PPR values (25LB45-Q at 8 PPR through 25LB30-Q at 12 PPR) provide coarser resolution, while 25LB15-Q and 25LB15-Q-Z at 24 PPR provide finer resolution than the 32 PPR specification. Selection depends on the application's resolution requirements.

Q: Are there differences between 25LB15-Q and 25LB15-Q-Z? A: Both parts are identical in electrical and mechanical specifications, maintaining 24 PPR output and all compatibility criteria. The "-Z" suffix indicates a variant designation but does not affect functional performance or substitution capability.

Q: Why does the Bourns ECW1D-C24-BC0024L have higher rotational life? A: The ECW1D-C24-BC0024L specifies 200K minimum rotational life cycles compared to 100K cycles for the 25LR11-Q. This represents a design difference between manufacturers and indicates extended operational durability for the Bourns component.

Q: Can I use a substitute with different PPR if my application allows it? A: Yes, provided your system firmware or hardware can accommodate the different resolution. All listed substitutes maintain identical mechanical interfaces, mounting types, orientation, and termination styles. PPR compatibility depends on your specific application requirements.

Q: What is the difference between RoHS Compliant and ROHS3 Compliant designations? A: Both designations indicate compliance with Restriction of Hazardous Substances regulations. ROHS3 Compliant represents updated compliance documentation. Both are acceptable for applications requiring RoHS compliance.

Q: Are all substitute parts currently in stock? A: Inventory availability varies by part number. Refer to the provided inventory data: 25LR11-Q (818 Pcs), 25LB11-Q (1020 Pcs), 25LB15-Q (1555 Pcs), 25LB15-Q-Z (707 Pcs), 25LB18-Q (1022 Pcs), 25LB22-Q (1987 Pcs), 25LB30-Q (1060 Pcs), 25LB45-Q (1024 Pcs), and ECW1D-C24-BC0024L (1155 Pcs).

Q: Do all parts share the same termination style? A: Yes. All listed parts use PC Pin termination, ensuring compatibility with existing PCB designs and panel mounting configurations.

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