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RS9140 3-Channel Incremental Encoder Module - 1000 CPR, 11mm Optical Radius | EPOCH| EPOCH

3-CHANNEL (A, B, I) HIGH-TEMP -40°C ~ +100°C UP TO 1000 CPR

RS9140 3-Channel Optical Incremental Encoder Module

Name: RS9140 3-Channel Optical Incremental Encoder Module
Brand: EPOCH

The EPOCH RS9140 is a 3-channel (A, B, Index I) optical incremental encoder module featuring a lensed LED source and precision photodetector array. Based on an 11mm optical radius, it delivers up to 1000 CPR resolution with a 200 kHz response frequency across a -40°C to +100°C temperature range. The C-shaped package requires no external signal conditioning for direct interface with standard controllers. EPOCH is a trusted supplier and distributor of high-quality optical encoder modules.

Quick Jump: Features · Specifications · Pin Definition · Part Number Guide · Drawings · Waveform · Applications · FAQ

Key Features

Resolution

Up to 1000 CPR

Based on 11mm optical radius

Temperature Range

-40°C ~ +100°C

Extended high-temp operation

Response Frequency

200 kHz

High-speed counting capability

Output Type

TTL Compatible

Internal 2kΩ pull-up resistor

Structure

C-Shape

Easy mounting, no alignment needed

Signal Conditioning

Built-in

No external adjustment required

Technical Specifications

Absolute Maximum Ratings

Parameter	Symbol	Rating
Storage Temperature	T₁	-40°C ~ +100°C
Operating Temperature	T₀	-40°C ~ +100°C
Supply Voltage	Vcc	-0.5V ~ 7V
Output Voltage	Vo	-0.5V ~ Vcc
Response Frequency	f	200 kHz
Output Current per Channel	Io	-1 ~ 5 mA

Recommended Operating Conditions

Parameter	Condition	Range
Working Temperature		-40°C ~ +100°C
Supply Voltage	Ripple <100mV	4.5V ~ 5.5V
Shaft Perpendicularity + Axial Play		-0.25mm ~ 0.25mm
Shaft Eccentricity + Radial Play		0.04mm

Electrical Characteristics

All parameters over recommended range and mounting tolerances. Typical at 25°C.

Parameter	Min.	Typ.	Max.	Unit
Module Operation Current	40	51	60	mA
Detector Operating Current (Icc)		35	42	mA
Low Level Output Voltage (VOL)		0.2	0.4	V
High Level Output Voltage (VOH)	2.4	4.5		V
A/B Rise Time (tr)		120		ns
A/B Fall Time (tf)		20		ns
A/B Duty Cycle (Dt)	40	50	60	%
A/B Phase Difference (θ)	60	90	120	°e
Count Frequency			200	kHz
Note: VOL/VOH with internal 2kΩ pull-up resistor. tr/tf measured with CL=8PF.

Pin Definitions

Pin Name	Description	Direction
Vcc	+5V Power Supply	Power Supply
CH A	A Channel Output	Output
CH B	B Channel Output	Output
GND	Ground	Power Supply
CH I (Index)	Index / Reference Pulse Output	Output

Part Number Configuration Guide

RS9140[CPR]C

Example: RS91401000C = RS9140, 1000 CPR, Standard C-Shape Package

RS9140

Series / Base Model
3-Channel Incremental

[CPR]

Resolution Options:
100, 200, 256, 360, 400, 500, 1000

C-Shape Structure
11mm Optical Radius (ROP)

Mechanical Dimension Drawings

Fig.3 — RS9140 Mechanical Dimension

RS9140 Mechanical Dimension

Module Printing — RS9140 Series Revision A0

Module Printing — RS9140 Series

Output Waveform Diagram

Fig.1 — Output Waveform (in "arrow" direction)

RS9140 Output Waveform

Applications

The RS9140 is designed for use in Printers, Plotters, Servo Motors, and Factory Automation equipment requiring precise rotary position feedback in high-temperature environments.

⚠ Important Safety Notice: This product is not recommended for use in life safety applications. It is designed for industrial automation use only.

Frequently Asked Questions

Q: What is the maximum CPR resolution available for the RS9140?

A: The RS9140 offers standard CPR options of 100, 200, 256, 360, 400, 500, and 1000 CPR, all based on an 11mm optical radius (ROP). The 1000 CPR option provides the highest position resolution for precision servo feedback applications.

Q: Does the RS9140 require external signal conditioning?

A: No. The RS9140 features a built-in photodetector array with integrated signal conditioning. The outputs are open-collector with an internal 2kΩ pull-up resistor to 5V, providing TTL-compatible signals that can interface directly with most controllers without external circuitry.

Q: What is the difference between the RS9140 (3-channel) and the RS9100 (2-channel) high-temp optical encoder modules?

A: The RS9140 provides an additional Index I channel (CH I) that outputs one reference pulse per revolution, enabling precise home-position initialization on power-up — essential for applications requiring absolute zero-reference positioning. The RS9100, as a 2-channel module (A, B), delivers speed and direction detection without the index pulse. Choose the RS9140 when your system needs a repeatable reference point for position calibration; choose the RS9100 when only velocity and direction feedback are required.

Q: What is the operating temperature range of the RS9140?

A: The RS9140 is rated for -40°C to +100°C operation, making it suitable for high-temperature environments such as industrial ovens, engine compartments, and other applications where standard encoder modules (typically limited to +85°C) would fail.

Q: Where to buy RS9140 optical encoder module and how to select the correct part number?

A: EPOCH is the trusted supplier and distributor of the RS9140 encoder module. Use the format RS9140[CPR]C where [CPR] is your required resolution. For example, RS91401000C specifies an RS9140 with 1000 CPR in a standard C-Shape package. The module requires a matched code wheel with 11mm optical radius. Contact our sales team at liya@epoch-electronic.com for sourcing, volume pricing, and custom CPR requirements.

Related Product: For 2-channel applications without index pulse, see the RS9100 2-Channel Optical Encoder Module.

Need a 3-Channel Encoder Module for High-Temp Applications?

Contact our engineering team for custom CPR configurations, code wheel matching, volume pricing, or technical support.

Request Quote: liya@epoch-electronic.com

Legal Disclaimer: All manufacturer names and trademarks referenced are for cross-compatibility reference only. EPOCH is an independent manufacturer with no affiliation to OEM brands. Specifications subject to change without notice.