1.3-inch OLED Display Module 128x40 SPI/I2C - REX012840A

1.3-inch OLED Display Module 128x40 SPI/I2C (SH1106G-0E IC)

Model No. REX012840A

The REX012840A is a 1.3 inch OLED display module with 128×40 resolution, built using a COG passive matrix structure. With compact 1.3 inch OLED display dimensions of 36.74 × 14.00 × 1.26 mm, this 1.3 OLED module supports monochrome white-on-black display, grayscale, and 256-step dimming. It integrates the SH1106G controller and supports both SPI and I2C interfaces, offering developers flexible system integration for 1.3 inch OLED applications.

Designed for stability and durability, the REX012840A operates across a wide temperature range from -40°C to +80°C. With low power consumption (typically 6.5–9.0 mA at 50% pixel on), this 1.3 OLED display is well-suited for handheld instruments, compact user interfaces, and space-constrained embedded systems requiring precise 1.3 inch OLED display dimensions.

This version is a pure COG type. If you need a COG+PCB version, please refer to REA012840A.

If you need technical support or product quotes for the REX012840A or other 1.3 inch OLED display modules, please feel free to contact our sales team!

Data Source ref: REX012840AWAP3N00000

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General Specs
Interface Pin Function
Contour Drawing
Absolute Maximum Ratings
Electrical Characteristics

Item	Dimension	Unit
Structure	COG
Size (Diagonal)	1.3	inch
Dot Matrix / Resolution	128 × 40	dots
Module Dimension	36.74 × 14.00 × 1.26	mm
Viewing Area	33.40 × 9.23	mm
Active Area	31.852 ×8.66	mm
Dot / Pixel Size	0.229 × 0.197	mm
Dot / Pixel Pitch	0.249 × 0.217	mm
Emitting Color	OLED, White
Support Grayscale	Yes
Display Mode	Passive Matrix
Gray Scale	1 bits
IC	SH1106G-0E
Interface	4-wire SPI, I2C
Power Supply	3V
Duty	1/40 duty
Operating Temperature	-40~+80	°C
Storage Temperature	-40~+85	°C
Polarizer Type	Polarizer Optional
Type	OLED Graphic Display

REX012840A 1.3-inch OLED Module - Supported Interfaces (SPI / I2C)

Pin No.	Symbol	I/O	Function
1	IXS	I	SPI/I2C Selection.
2	SCLK/ SCL	I	Clock.
3	SDIN/ SDA	I	Data.
4	DC	I	Data/Command Selection.
5	CSB	I	Chip Selection.
6	RSTB	I	Reset.
7	VDD	P	Logic Power Supply.
8	IREF	-	Segment Current Reference.
9	VCC	P	OLED Drive Power Supply.
10	VCOMH	O	This is a pad for the voltage output high level for common signals. A capacitor should be connected between this pad and VSS.
11	GND	P	GND.

1.3-inch OLED Display Module 128x40 SPI/I2C - REX012840A Contour Drawing

Operating Temperature & Power Efficiency

Parameter	Symbol	Min	Max	Unit
OLED Drive Power Supply Voltage	VCC	-0.3	14.5	V
Logic Power Supply Voltage	VDD	-0.3	3.6	V
Signal Input Voltage	Vi	-0.3	VDD+0.3	V
Operating Temperature	TOP	-40	+80	°C
Storage Temperature	TSTG	-40	+85	°C

DC Characteristics

Item	Symbol	Condition	Min	Typ	Max	Unit
OLED Drive Power Supply Voltage	VCC	－	6.4	12.0	12.5	V
Logic Power Supply Voltage	VDD	－	1.65	3.3	3.5	V
Input High Volt	VIH	－	0.8xVDD	－	VDD	V
Input Low Volt	VIL	－	0	－	0.2xVDD	V
Output High Volt	VOH	－	0.8xVDD	－	VDD	V
Output Low Volt	VOL	－	0	－	0.2xVDD	V
Display 50% Pixel on	ICC	VCC=12V	－	6.5	9.0	mA