R5F10266ASP#X0 Equivalent & Substitute Parts

Part Overview

The R5F10266ASP#X0 is a 16-bit RL78/G12 microcontroller manufactured by Renesas Electronics Corporation, featuring 2KB FLASH program memory, 256 bytes of RAM, and integrated peripherals including UART/USART, I2C, CSI connectivity, DMA, PWM, and watchdog timer functionality. The device operates at 24MHz with a supply voltage range of 1.8V to 5.5V and is housed in a 20-LSSOP surface mount package.

The R5F10266ASP#X0 carries an Obsolete product status. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support long-term product availability for applications currently utilizing this microcontroller.

Key Parameters

Parameter	Value
Core Processor	RL78
Core Size	16-Bit
Speed	24MHz
Program Memory Size	2KB (2K x 8)
Program Memory Type	FLASH
EEPROM Size	2K x 8
RAM Size	256 x 8
Voltage - Supply (Vcc/Vdd)	1.8V ~ 5.5V
Number of I/O	14
Connectivity	CSI, I2C, UART/USART
Peripherals	DMA, LVD, POR, PWM, WDT
Data Converters	A/D 11x8/10b
Oscillator Type	Internal
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Package / Case	20-LSSOP (0.173", 4.40mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)

Substitute Part Grouping Explanation

Substitute parts for the R5F10266ASP#X0 are identified based on strict equivalence across all critical electrical and mechanical parameters. The substitution logic is based on the following key parameters that must remain identical:

Core processor architecture (RL78)
Core size (16-Bit)
Operating frequency (24MHz)
Program memory capacity and type (2KB FLASH)
EEPROM and RAM configuration (2K x 8 and 256 x 8 respectively)
Supply voltage range (1.8V ~ 5.5V)
I/O count (14 pins)
Connectivity interfaces (CSI, I2C, UART/USART)
Peripheral set (DMA, LVD, POR, PWM, WDT)
Data converter specifications (A/D 11x8/10b)
Package type and dimensions (20-LSSOP)
Compliance certifications (ROHS3, REACH Unaffected)

Substitute parts differ only in packaging format (Cut Tape vs. Tape & Reel) or minor device designation variants that do not affect functional or electrical characteristics.

Parameter Comparison

Parameter	R5F10266ASP#X0	R5F10266ASP#55	R5F10266DSP#55
Manufacturer	Renesas Electronics Corporation	Renesas Electronics Corporation	Renesas Electronics Corporation
Series	RL78/G12	RL78/G12	RL78/G12
Core Processor	RL78	RL78	RL78
Core Size	16-Bit	16-Bit	16-Bit
Speed	24MHz	24MHz	24MHz
Program Memory Size	2KB (2K x 8)	2KB (2K x 8)	2KB (2K x 8)
Program Memory Type	FLASH	FLASH	FLASH
EEPROM Size	2K x 8	2K x 8	2K x 8
RAM Size	256 x 8	256 x 8	256 x 8
Voltage - Supply (Vcc/Vdd)	1.8V ~ 5.5V	1.8V ~ 5.5V	1.8V ~ 5.5V
Number of I/O	14	14	14
Connectivity	CSI, I2C, UART/USART	CSI, I2C, UART/USART	CSI, I2C, UART/USART
Peripherals	DMA, LVD, POR, PWM, WDT	DMA, LVD, POR, PWM, WDT	DMA, LVD, POR, PWM, WDT
Data Converters	A/D 11x8/10b	A/D 11x8/10b	A/D 11x8/10b
Oscillator Type	Internal	Internal	Internal
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	20-LSSOP (0.173", 4.40mm Width)	20-LSSOP (0.173", 4.40mm Width)	20-LSSOP (0.173", 4.40mm Width)
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected
Packaging Format	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)	Not Specified

Engineering Selection Recommendations

Both R5F10266ASP#55 and R5F10266DSP#55 are functionally equivalent to the R5F10266ASP#X0 across all electrical and mechanical specifications. The primary distinction is product status: R5F10266ASP#X0 is classified as Obsolete, while R5F10266ASP#55 and R5F10266DSP#55 are Active products.

For new designs or ongoing production requiring long-term supply assurance, R5F10266ASP#55 or R5F10266DSP#55 are the appropriate selections. Both substitute parts maintain full compliance with ROHS3 and REACH requirements, identical operating temperature ranges, and equivalent moisture sensitivity specifications.

The choice between R5F10266ASP#55 and R5F10266DSP#55 depends on packaging format requirements. R5F10266ASP#55 is supplied in Tape & Reel format, while R5F10266DSP#55 packaging format is not specified in the provided data.

Frequently Asked Questions (FAQ)

Q: Can R5F10266ASP#55 or R5F10266DSP#55 be used as direct replacements for R5F10266ASP#X0?

A: Yes. Both parts are parametrically equivalent across all critical electrical and mechanical parameters, including core processor, clock speed, memory configuration, I/O count, connectivity interfaces, peripherals, supply voltage range, package type, and compliance certifications. The primary advantage is that both substitute parts carry Active product status, ensuring continued availability.

Q: What is the difference between R5F10266ASP#55 and R5F10266DSP#55?

A: Both parts are parametrically identical in electrical specifications and package dimensions. The difference lies in the device designation suffix (ASP vs. DSP). R5F10266ASP#55 is specified with Tape & Reel packaging format. The packaging format for R5F10266DSP#55 is not specified in the provided technical data.

Q: Are there any compatibility concerns when substituting these parts?

A: No compatibility concerns exist. All three parts share identical pinout, package dimensions (20-LSSOP, 0.173" × 4.40mm), and electrical characteristics. PCB layout, footprint, and firmware compatibility remain unchanged.

Q: What is the significance of the Obsolete status for R5F10266ASP#X0?

A: Obsolete status indicates that Renesas Electronics Corporation has discontinued active production and support for this part number. Existing inventory may be available through authorized distributors, but long-term supply cannot be guaranteed. Transitioning to Active alternatives (R5F10266ASP#55 or R5F10266DSP#55) is recommended for designs requiring extended product lifecycle support.

Q: Do all three parts meet the same compliance requirements?

A: Yes. All three parts are ROHS3 Compliant, REACH Unaffected, and carry identical Moisture Sensitivity Level (MSL) ratings of 3 (168 Hours). Compliance certifications are equivalent across all variants.

Q: What inventory levels are available for each part?

A: R5F10266ASP#X0 has 940 pieces in stock. R5F10266ASP#55 has 811 pieces in stock. R5F10266DSP#55 has 1056 pieces in stock. Inventory levels are subject to change and should be verified with the supplier for current availability.

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