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RK_L Wide-Voltage Optical Encoder Kit — 60 KHz 850nm IR 12 LPI Options 2.7-5.5V | EPOCH| EPOCH

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

RK_L Optical Encoder Kit — Wide-Voltage Range, 60 kHz, 12 LPI Options, 2.7-5.5V Supply

Name: RK_L Series Wide-Voltage Optical Incremental Encoder Kit
Brand: EPOCH
SKU: RK_L
Price: Contact for quote USD
Availability: InStock

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. It consists of a highly collimated 850nm infrared light source and a detector IC enclosed in a compact C-shaped plastic package. When matched with a code disc or code strip, it provides precise rotary or linear position information. The RK_L series offers 12 linear (LPI) resolution options from 20 to 450 LPI, with a response frequency of 60 kHz and a wide 2.7V ~ 5.5V single-end supply range, making it ideal for flexible system integration.

Quick Select: Tech Specs Ordering Guide FAQ RK Standard Variant

Mechanical Dimensions

Fig.4 — Straight Lead Dimensions Without Mounting Holes

RK_L Straight Lead Dimensions Without Mounting Holes Mechanical drawing — straight lead package without mounting holes (all dimensions in mm)

Fig.5 — Straight Lead Dimensions With Mounting Holes

RK_L Straight Lead Dimensions With Mounting Holes

Mechanical drawing — straight lead package with mounting holes (all dimensions in mm)

Fig.6 — Bent Lead Dimension Without Mounting Holes

Bent Lead Dimension Without Mounting Holes

Mechanical drawing — bent lead package without mounting holes (all dimensions in mm)

Fig.7 — Bent Lead Dimension With Mounting Holes

RK_L Bent Lead Dimension With Mounting Holes

Mechanical drawing — bent lead package with mounting holes (all dimensions in mm)

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

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. 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 features 12 linear (LPI) resolution options covering a broad spectrum of applications.

2-channel incremental encoder — Quadrature Aout and Bout outputs with TTL-compatible levels
Wide supply voltage range: 2.7V ~ 5.5V single-end supply (typical 5V)
12 linear LPI options: 20, 37, 45, 75, 90, 120, 150, 180, 254, 300, 360, 450 LPI for flexible linear encoder configurations
60 kHz response frequency for reliable motion control feedback
850nm infrared light source with high collimation for consistent optical performance
Photo-detector array for accurate position sensing
Wide operating temperature: -20°C ~ +85°C
C-Shape structure — compact plastic package, easy to mount
Multiple mechanical options: straight or bent leads, with or without mounting holes
TTL compatible outputs for straightforward interface design

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 well-suited for industrial automation systems requiring reliable 2-channel quadrature output across varying supply conditions.

Note: Not recommended for use in safety critical applications, e.g. ABS braking systems.

RK_L Wide-Voltage Encoder Kit — Absolute Maximum Ratings

Parameter	Symbol	Rating
Storage Temperature	T_s	-40 ~ +85 °C
Supply Voltage	V_cc	-0.5 ~ 7 V
Soldering Temperature	—	≤260 °C (t≤5s)
Response Frequency	f	60 KHz
Reverse Voltage	V_r	5V
Forward Current (850nm Light Source)	I_f	60 mA

RK_L Wide-Voltage Encoder Kit — Electrical Characteristics

Under recommended operating range, typical at 25 °C

Parameter	Symbol	Min.	Typ.	Max.	Unit	Condition
Operating Temperature	T	-20		+85	°C
Operating Voltage	V_cc	2.7	5	5.5	V	Ripple voltage <100mV
Light Source (850nm) Forward Voltage	V_f	1.4		1.9	V	I_f=20mA
Light Source (850nm) Wavelength	λ_p	840		860	nm
Low Level Output Voltage	V_OL		0.2	0.4	V
High Level Output Voltage	V_OH	V_cc*0.8	V_cc-0.5		V
AB Duty Ratio	D_t	40	50	60	%
A/B Phase Difference	θ	60	90	120	°e
Response Frequency	f			60	KHz

Light Source Characteristic Curves — 850nm Infrared

Fig.1 — 850nm Forward Voltage And Forward Current

RK_L 850nm Forward Voltage And Forward Current

I-V Graph — Forward Voltage (V) vs Forward Current (mA) for 850nm light source

Fig.2 — 850nm Forward Current And Relative Luminous Intensity

RK_L 850nm Forward Current And Relative Luminous Intensity

L-I Graph — Forward Current (mA) vs Relative Luminous Intensity for 850nm light source

A/B Output Waveform Diagram

Fig.3 — A/B Output Waveform Diagram

RK_L A/B Output Waveform Diagram

Quadrature Aout and Bout waveform timing diagram showing 90° electrical phase shift between channels

RK_L Optical Encoder Kit — Pin Definition

Pin Name	Function	Direction
An	Positive pole of light source (recommended I_f=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

Ordering Information / Part Number — RK_L Series

Code Structure: RK L [LPI Code] - [Lead Type] [Mounting Holes]

R

→

K

→

L

→

LPI Code

→

Lead Type

→

Mtg Holes

Series Prefix

Wide Voltage

e.g. 02=20, F5=450 LPI

e.g. (omit)=Straight
1=Bent

e.g. (omit)=no holes
1=with holes

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

Lead Code	(omit)	1
Configuration	Straight lead	Bent lead

Holes Code	(omit)	1
Mounting	Without holes	With holes

Note: When the 450 LPI module (code F5) is used, the code-wheel needs to be placed within the 1/3 area of the C port close to the receive chip.

Example Ordering Code:

RKL30

= RK_L Series · L=Wide Voltage · 30=300 LPI · (omit)=Straight lead · (omit)=No mounting holes

RKL021

= RK_L Series · L=Wide Voltage · 02=20 LPI · 1=Bent lead · 1=With mounting holes

RKLF5

= RK_L Series · L=Wide Voltage · F5=450 LPI · (omit)=Straight lead · (omit)=No mounting holes

Module Printing — Product Marking

RKL-Module-Printing-Label

Product marking label on module body (refer to datasheet for detailed code mapping).

Related Product — RK Standard Optical Encoder Kit

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

Technical FAQs — RK_L Wide-Voltage Optical Encoder Kit

Q: What is the difference between the RK_L and the standard RK optical encoder kit?

A: The RK_L is the wide-voltage variant supporting 2.7V ~ 5.5V supply (vs. 4.5V ~ 5.5V for RK), with a 60 kHz response frequency and 12 LPI options (20, 37, 45, 75, 90, 120, 150, 180, 254, 300, 360, 450 LPI). It uses an 850nm infrared light source only and does not include internal pull-up resistors on the outputs.

Q: What output type does the RK_L optical encoder kit provide?

A: The RK_L optical encoder kit provides TTL-compatible 2-channel quadrature outputs (Aout and Bout). Note that the RK_L does not include internal pull-up resistors — external pull-up resistors may be required depending on your interface circuit design.

Q: What LPI resolution options are available for the RK_L encoder kit?

A: The RK_L offers 12 linear LPI options: 20, 37, 45, 75, 90, 120, 150, 180, 254, 300, 360, and 450 LPI. The 450 LPI option requires special placement of the code-wheel within the 1/3 area of the C port close to the receive chip.

Q: What applications is the RK_L C-shape optical encoder kit suitable for?

A: The RK_L C-shape optical encoder kit is suitable for printers, plotters, servo motors, DC motors, stepper motors, office automation equipment, and industrial automation systems requiring reliable 2-channel incremental position sensing across a wide voltage range.

Need help selecting the right RK_L encoder kit?

Contact EPOCH for application-specific guidance and ordering assistance.

Contact Sales →

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 use in safety critical applications. EPOCH and the EPOCH logo are trademarks of POCH Electronics. All other product names and trademarks mentioned are the property of their respective owners.

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