Grayhill 25LB10-Q-Z Rotary Encoder: Equivalent & Substitute Parts

Part Overview

The Grayhill 25LB10-Q-Z is a mechanical rotary encoder with 36 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 Active status and ROHS3 compliant with unlimited moisture sensitivity rating (MSL 1).

Substitute parts are necessary when the original specification requires different pulse-per-revolution resolution, alternative termination styles, or when inventory constraints necessitate equivalent alternatives from the same or compatible manufacturer series.

Key Parameters

Parameter	Value
Manufacturer Part Number	25LB10-Q-Z
Manufacturer	Grayhill Inc.
Series	25L
Encoder Type	Mechanical
Output Type	Quadrature (Incremental)
Pulses per Revolution	36
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
MSL Rating	1 (Unlimited)
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitution logic for the 25LB10-Q-Z is based on the following allowed parameters:

Primary Substitution Criteria:

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
Product Status: Active
RoHS Compliance: ROHS3 Compliant

Variable Parameter (Resolution):

Pulses per Revolution: 36 PPR (main part) vs. 8, 12, 16, 20, 24, or 32 PPR (substitutes)

Grayhill 25L series substitutes maintain identical mechanical, electrical, and compliance characteristics while offering alternative pulse resolutions. The ECW1D-C24-BC0024L from Bourns Inc. provides cross-manufacturer substitution with 24 PPR resolution and enhanced rotational life (200K cycles vs. 100K cycles).

Parameter Comparison

Part Number	Manufacturer	Series	PPR	Encoder Type	Output Type	Actuator	Detent	Mounting	Termination	Rotational Life (Cycles)	RoHS Status
25LB10-Q-Z	Grayhill Inc.	25L	36	Mechanical	Quadrature	1/4" Flatted	Yes	Panel, PCB	PC Pin	100K	ROHS3
25LB10-Q	Grayhill Inc.	25L	36	Mechanical	Quadrature	1/4" Flatted	Yes	Panel, PCB	PC Pin	100K	ROHS3
25LB11-Q	Grayhill Inc.	25L	32	Mechanical	Quadrature	1/4" Flatted	Yes	Panel, PCB	PC Pin	100K	ROHS3
25LB15-Q	Grayhill Inc.	25L	24	Mechanical	Quadrature	1/4" Flatted	Yes	Panel, PCB	PC Pin	100K	ROHS3
25LB15-Q-Z	Grayhill Inc.	25L	24	Mechanical	Quadrature	1/4" Flatted	Yes	Panel, PCB	PC Pin	100K	ROHS3
25LB18-Q	Grayhill Inc.	25L	20	Mechanical	Quadrature	1/4" Flatted	Yes	Panel, PCB	PC Pin	100K	ROHS3
25LB22-Q	Grayhill Inc.	25L	16	Mechanical	Quadrature	1/4" Flatted	Yes	Panel, PCB	PC Pin	100K	ROHS3
25LB30-Q	Grayhill Inc.	25L	12	Mechanical	Quadrature	1/4" Flatted	Yes	Panel, PCB	PC Pin	100K	ROHS3
25LB45-Q	Grayhill Inc.	25L	8	Mechanical	Quadrature	1/4" Flatted	Yes	Panel, PCB	PC Pin	100K	ROHS3
ECW1D-C24-BC0024L	Bourns Inc.	ECW	24	Mechanical	Quadrature	1/4" Flatted	Yes	Panel, PCB	PC Pin	200K	ROHS3

Engineering Selection Recommendations

Direct Equivalent (Same Resolution): The 25LB10-Q is a direct equivalent to 25LB10-Q-Z, maintaining identical specifications with 36 PPR resolution. Both parts are Active status, ROHS3 compliant, and feature 100K rotational life cycles. Selection between these two depends on packaging designation requirements only.

Resolution-Based Substitutes (Grayhill 25L Series): The 25LB11-Q (32 PPR), 25LB15-Q/25LB15-Q-Z (24 PPR), 25LB18-Q (20 PPR), 25LB22-Q (16 PPR), 25LB30-Q (12 PPR), and 25LB45-Q (8 PPR) are all Active status, ROHS3 compliant mechanical encoders with identical mechanical interfaces and 100K rotational life. These substitutes are applicable when application requirements specify lower pulse resolution.

Cross-Manufacturer Substitute: The Bourns ECW1D-C24-BC0024L provides 24 PPR resolution with enhanced rotational life of 200K cycles. This part maintains ROHS3 compliance and identical mechanical mounting characteristics. The ECW1D series is suitable for applications requiring extended operational durability.

All substitute parts maintain Active product status and full regulatory compliance (ROHS3, REACH Unaffected, EAR99 ECCN classification).

Frequently Asked Questions (FAQ)

Q: Can the 25LB10-Q-Z be replaced with a lower PPR resolution encoder?

A: Yes. The 25L series encoders with 32, 24, 20, 16, 12, or 8 PPR maintain identical mechanical, electrical, and compliance specifications. Selection of lower resolution depends on application requirements for angular position resolution.

Q: What is the difference between 25LB10-Q-Z and 25LB10-Q?

A: Both parts are identical in electrical and mechanical specifications with 36 PPR resolution, 100K rotational life, and ROHS3 compliance. The difference is packaging designation only (Z suffix vs. no suffix).

Q: Is the Bourns ECW1D-C24-BC0024L a suitable substitute?

A: The ECW1D-C24-BC0024L is a cross-manufacturer substitute with 24 PPR resolution and 200K rotational life cycles. It maintains identical mechanical mounting, detent operation, and ROHS3 compliance. This part is suitable when extended operational life is required.

Q: Are all substitute parts panel and PCB through-hole mountable?

A: Yes. All listed substitute parts support both panel and PCB through-hole mounting with identical mechanical interfaces and 1/4" diameter flatted end actuators.

Q: Do all substitute parts have detent operation?

A: Yes. All substitute parts in the 25L series and the ECW1D-C24-BC0024L include detent mechanisms and lack built-in switches, maintaining functional equivalence to the 25LB10-Q-Z.

Q: What is the rotational life difference between Grayhill and Bourns options?

A: Grayhill 25L series parts specify 100K minimum rotational life cycles. The Bourns ECW1D-C24-BC0024L specifies 200K minimum cycles, providing extended durability for high-cycle applications.

Q: Are all parts ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating and REACH Unaffected status.

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