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|||RK_L Wide-Voltage Optical Encoder Kit — 2.7-5.5V Cost-Optimized for 3.3V Systems | EPOCH| EPOCH

[RK_L SERIES] wide-voltage 2-channel optical incremental encoder kit

RK_L Wide-Voltage Optical Encoder Kit — 2.7-5.5V, 60 kHz, Cost-Optimized for 3.3V Systems

The EPOCH RK_L optical encoder kit is a high-performance, low-cost, two-channel optical incremental encoder module designed for wide voltage range operation. Housed in a compact C-shaped plastic package, it features an 850nm infrared light source and delivers reliable quadrature position feedback when matched with a code disc or codestrip. With a supply range of 2.7V to 5.5V, the RK_L wide-voltage encoder kit is especially cost-optimized for 3.3V systems and battery-powered applications.

Quick Select: Mechanical Dimensions Tech Specs Ordering Guide FAQ RK Variant

RK_L Wide-Voltage Encoder Kit — Mechanical Dimensions Drawings (Fig.4–Fig.7)

Fig.4 — Straight Lead Dimensions Without Mounting Holes

[Upload: RK_L-Fig4-Straight-Lead-No-Holes.jpg]

Mechanical drawing — straight lead package dimensions without mounting holes (unit: mm)

RK_L Series Optical Encoder Modules Straight Lead Dimensions

Fig.5 — Straight Lead Dimensions With Mounting Holes

[Upload: RK_L-Fig5-Straight-Lead-With-Holes.jpg]

Mechanical drawing — straight lead package dimensions with mounting holes (unit: mm)

RK_L Series Optical Encoder Modules Straight Lead Dimensions

Fig.6 — Bent Lead Dimension Without Mounting Holes

[Upload: RK_L-Fig6-Bent-Lead-No-Holes.jpg]

Mechanical drawing — bent lead package dimensions without mounting holes (unit: mm)

RK_L Series Optical Encoder Modules Bent Lead Dimension

Fig.7 — Bent Lead Dimension With Mounting Holes

[Upload: RK_L-Fig7-Bent-Lead-With-Holes.jpg]

Mechanical drawing — bent lead package dimensions with mounting holes (unit: mm)

RK_L Series Optical Encoder Modules Bent Lead Dimension With Mounting Holes

RK_L Wide-Voltage Optical Incremental Encoder Kit — Description & Key Features

The EPOCH RK_L wide-voltage optical encoder kit is a high-performance, low-cost, two-channel optical incremental encoder module for wide voltage range operation. It consists of a highly collimated 850nm infrared light source and a detector IC enclosed in a small C-shaped plastic package. When matched with a code disc or codestrip, it provides precise rotary or linear position information. The RK_L series supports linear (LPI) encoder configurations with an extensive range of resolution options.

2-channel incremental encoder — Quadrature Aout and Bout outputs with TTL-compatible levels
Wide supply voltage range: 2.7V ~ 5.5V enabling both 3.3V and 5V operation
LPI-based resolution: 12 LPI options from 20 to 450 LPI for linear encoder applications
60 kHz response frequency suitable for general-purpose motion control feedback
850nm infrared light source for reliable optical sensing
Wide operating temperature: -20°C ~ +85°C
Multiple mechanical options: straight or bent leads, with or without mounting holes

RK_L C-Shape Optical Encoder Kit — Typical Applications

Typical applications of the RK_L C-shape optical encoder kit include printers, plotters, servo motors, DC motors, stepper motors, and office automation equipment. The wide-voltage encoder kit is particularly well-suited for battery-powered devices and 3.3V-based motion control systems requiring reliable 2-channel quadrature output.

Safety Note: This product is not recommended for use in safety-critical applications such as ABS braking systems.

RK_L Wide-Voltage Encoder Kit — Electrical & Mechanical Specifications Table

Parameter	Specification
Technology	Optical incremental encoder module, C-shape plastic package
Output Signals	2-channel (Aout, Bout) — TTL compatible
Resolution	LPI-based; LPI options: 20, 37, 45, 75, 90, 120, 150, 180, 254, 300, 360, 450
Supply Voltage	2.7V ~ 5.5V (wide voltage range)
Response Frequency	60 kHz
Operating Temperature	-20°C ~ +85°C
Storage Temperature	-40°C ~ +85°C
Light Source	850nm (infrared)

RK_L Wide-Voltage Encoder Kit — 850nm Light Source Characteristic Curves

RK_L Series Optical Encoder Modules Light Source Characteristic Curve

RK_L Optical Encoder Kit — A/B Output Waveform Diagram

Fig.3 — A/B Output Waveform Diagram

[Upload: RK_L-Fig3-AB-Output-Waveform.jpg]

Quadrature A/B output waveform — 2-channel incremental signals with 90° electrical phase shift

RK_L Series Optical Encoder Modules A/B Output Waveform Diagram

RK_L Wide-Voltage Optical Encoder Kit — Pin Definition Table

Pin Name	Function	Direction
An	Positive pole of light source (recommended If=10mA)
Ca	Negative pole of light source
Vcc	Power Supply +	Power Supply
Aout	A Channel output	Output
Bout	B Channel output	Output
Gnd	Ground	Ground

RK_L Wide-Voltage Encoder Kit — Ordering Information & Product Code Structure Guide

The RK_L wide-voltage optical encoder kit ordering code follows the format: RK [LPI] [Lead Type] [Light Source] [Mounting Holes]

The "L" in RK_L denotes the wide-voltage version (2.7V ~ 5.5V), supporting both 3.3V and 5V systems. The light source is fixed at 850nm infrared for the RK_L series.

Ordering Code Structure Flowchart

→

LPI

→

Lead

→

Light Src

→

Mtg Holes

Legend: Blue = LPI | Orange = Lead Type | Purple = Light Source | Pink = Mounting Holes

LPI — Linear Resolution Options
Code	LPI	Description
02	20	20 LPI
37	37	37 LPI
45	45	45 LPI
75	75	75 LPI
09	90	90 LPI
12	120	120 LPI
15	150	150 LPI
18	180	180 LPI
25	254	254 LPI
30	300	300 LPI
36	360	360 LPI
F5	450	450 LPI

Lead Type — Mechanical Configuration
Code	Type	Description
0	Straight	Straight lead package
1	Bent	Bent lead package

Light Source — Optical Wavelength
Code	Wavelength	Description
8	850nm	Infrared light source (RK_L series)

Mounting Holes — Package Option
Code	Option	Description
(omit)	Without holes	Standard package without mounting holes
1	With holes	Package with mounting holes

Ordering Examples: RK30-08 = RK_L series, 300 LPI (code 30), straight lead (0), 850nm light source (8), without mounting holes (omitted). RK09-181 = RK_L series, 90 LPI (code 09), bent lead (1), 850nm light source (8), with mounting holes (1).

Note: When using 450 LPI modules, the code-wheel must be placed within the 1/3 area of the C port closest to the receive chip for proper optical alignment.

RK_L Wide-Voltage Encoder Kit — Module Printing Marking

The RK_L wide-voltage optical encoder kit module includes laser marking on the package for identification. The printing typically includes the series designation, LPI code, and date code for traceability.

Module Printing — RK_L Housing Marking Diagram

[Upload: RK_L-Module-Printing-Marking.jpg]

Module printing marking diagram showing RK_L series identification, LPI code, and date code on the C-shape plastic housing

RK_L-Module-Printing-Marking

Related Product — RK Standard Optical Encoder Kit Cross-Reference

For applications requiring a higher response frequency (200 kHz), rotary CPR resolution (up to 600 CPR), selectable 650nm/850nm light sources, or integrated 2kΩ pull-up resistors, consider the RK Series Optical Encoder Kit. The RK variant shares the same C-shape mechanical design and package but operates with a standard 5V supply (4.5V ~ 5.5V).

Technical FAQs — RK_L Wide-Voltage Optical Encoder Kit

Q: What voltage range does the RK_L wide-voltage optical encoder kit support?

A: The RK_L wide-voltage optical encoder kit supports a wide supply voltage range of 2.7V to 5.5V, making it ideal for both 3.3V and 5V systems. This wide-voltage encoder kit eliminates the need for additional voltage regulation in battery-powered devices.

Q: What LPI options are available for the RK_L C-shape optical encoder kit?

A: The RK_L C-shape optical encoder kit offers 12 LPI resolution options: 20, 37, 45, 75, 90, 120, 150, 180, 254, 300, 360, and 450 LPI. The RK_L series uniquely includes 37, 75, 120, 254, and 450 LPI variants not available in the standard RK series.

Q: What applications is the RK_L C-shape wide-voltage cost-optimized encoder kit suitable for?

A: The RK_L C-shape wide-voltage cost-optimized encoder kit is suitable for printers, servo motors, DC motors, stepper motors, plotters, and office automation equipment. It is especially well-suited for battery-powered and 3.3V-based embedded systems where its wide voltage range eliminates the need for additional voltage regulation.

Need help selecting the right RK_L encoder kit?

Contact EPOCH for application-specific guidance and ordering assistance.

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Disclaimer: The information provided in this datasheet is for general reference only. EPOCH reserves the right to make product changes without prior notice. Customers should verify that the product is suitable for their intended application. Not recommended for safety-critical or life-support systems without explicit written approval from EPOCH.

Ordering Information

Ordering Information / Part Number

RK_L series is available in a variety of options, as shown in the table below.

RK Series Optical Encoder Modules Ordering Information

*When the 450LPI module is used, the code-wheel needs to be placed within the 1/3 area of the C port close to the receive chip.

Module Printing

RK Series Optical Encoder Modules Module Printing

Packaging Information

Item	Description	QTY/Tray	Trays/Carton	G.W	N.W	QTY/Carton	Package Size
RK Series	RK Series Optical Encoder Modules	160 pcs	10 trays	1.96 kgs	0.8 kgs	1600 pcs	375314165 (mm)
RK Series	RK Series Optical Encoder Modules	160 pcs	40 trays	6.94 kgs	3.2 kgs	6400 PCS	560270320 (mm)

Material Weight Schedule

Material	Optical Encoder Module	Tray	Carton/Small	Carton/Big
Weight	0.5g/pc	74g/pc	420g/pc	780g/pc
QTY/Carton	1,600pcs / 6,400pcs	10trays / 40 trays	1pc	1pc
Weight/Carton	800g / 3,200g	740g / 2,960g	420g	780g
			1,960g/1600pcs	6,940g/6400pcs