UPD78F9502MA-CAC-A Equivalent & Substitute Parts

Part Overview

The UPD78F9502MA-CAC-A is an 8-bit microcontroller from Renesas Electronics Corporation's 78K0S/Kx1+ series, featuring 4KB FLASH memory and operating at 10MHz. This device is classified as obsolete, making equivalent and substitute parts necessary for new designs and production continuity. The part is housed in a 10-LSSOP surface mount package and operates across an industrial temperature range of -40°C to 85°C with supply voltage tolerance from 2V to 5.5V.

Key Parameters

Parameter	Value
Core Size	8-Bit
Program Memory Size	4KB (4K x 8)
Program Memory Type	FLASH
RAM Size	128 x 8
Speed	10MHz
Voltage - Supply (Vcc/Vdd)	2V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Package / Case	10-LSSOP
Number of I/O	7
Peripherals	LVD, POR, PWM, WDT
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the UPD78F9502MA-CAC-A is determined by the following critical parameters:

Program Memory Size: 4KB FLASH (4K x 8) — exact match required
Supply Voltage Range: 2V ~ 5.5V — substitute must operate within or encompass this range
Mounting Type: Surface Mount — package form factor compatibility
Operating Temperature Range: -40°C ~ 85°C — industrial temperature compliance
Core Processor Architecture: 8-bit architecture preferred for direct functional replacement
Package Compatibility: 10-pin LSSOP or equivalent pin-count packages

The identified substitute parts meet the primary memory and voltage specifications. Variations in core architecture (8-bit vs. 16-bit), speed, RAM size, and I/O count are acceptable where the application requirements permit, provided that the FLASH memory capacity and supply voltage specifications are maintained.

Parameter Comparison

Parameter	UPD78F9502MA-CAC-A	R5F10Y17ASP#30	ATTINY402-SSNR
Manufacturer	Renesas Electronics Corporation	Renesas Electronics Corporation	Microchip Technology
Core Size	8-Bit	16-Bit	8-Bit
Program Memory Size	4KB (4K x 8)	4KB (4K x 8)	4KB (4K x 8)
Program Memory Type	FLASH	FLASH	FLASH
RAM Size	128 x 8	512 x 8	256 x 8
Speed	10MHz	20MHz	20MHz
Voltage - Supply (Vcc/Vdd)	2V ~ 5.5V	2V ~ 5.5V	1.8V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 105°C (TA)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	10-LSSOP (0.225", 5.72mm Width)	10-LSSOP (0.173", 4.40mm Width)	8-SOIC (0.154", 3.90mm Width)
Number of I/O	7	6	6
Peripherals	LVD, POR, PWM, WDT	DMA, LVD, POR, PWM, WDT	Brown-out Detect/Reset, POR, PWM, WDT
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

R5F10Y17ASP#30 (Renesas Electronics Corporation RL78/G10 series) is an active product with identical FLASH memory capacity (4KB) and matching supply voltage range (2V ~ 5.5V). This part operates at 20MHz with enhanced RAM capacity (512 x 8) and includes additional connectivity options (CSI, I2C, LINbus, UART/USART) and DMA functionality. The 10-LSSOP package maintains pin compatibility with the original part. Selection of this substitute is appropriate where the 16-bit architecture and higher performance are compatible with application requirements.

ATTINY402-SSNR (Microchip Technology tinyAVR 0 series) is an active product with matching 8-bit core architecture and identical FLASH memory capacity (4KB). This part operates at 20MHz with extended supply voltage tolerance (1.8V ~ 5.5V) and broader operating temperature range (-40°C ~ 105°C). The 8-SOIC package differs from the original 10-LSSOP form factor, requiring PCB layout modification. Selection of this substitute is appropriate where the AVR architecture and lower pin count are compatible with application requirements and where package redesign is feasible.

Both substitute parts maintain ROHS3 compliance and industrial-grade certifications consistent with the original device.

Frequently Asked Questions (FAQ)

Q: Can R5F10Y17ASP#30 directly replace UPD78F9502MA-CAC-A without firmware modification?

A: R5F10Y17ASP#30 shares identical FLASH memory size (4KB) and supply voltage specifications (2V ~ 5.5V). However, the 16-bit RL78 core architecture differs from the 8-bit 78K0S core. Firmware porting is required. The 10-LSSOP package pinout must be verified for compatibility.

Q: What are the package differences between the substitute parts?

A: UPD78F9502MA-CAC-A uses 10-LSSOP (0.225", 5.72mm width). R5F10Y17ASP#30 uses 10-LSSOP (0.173", 4.40mm width) — same pin count but different physical dimensions. ATTINY402-SSNR uses 8-SOIC (0.154", 3.90mm width) — different pin count and package type, requiring PCB redesign.

Q: Are all substitute parts RoHS compliant?

A: Yes. UPD78F9502MA-CAC-A, R5F10Y17ASP#30, and ATTINY402-SSNR are all ROHS3 compliant.

Q: Which substitute part has the widest operating temperature range?

A: ATTINY402-SSNR operates from -40°C to 105°C, extending 20°C above the original part's upper limit of 85°C.

Q: Can ATTINY402-SSNR be used as a direct pin-compatible replacement?

A: No. ATTINY402-SSNR is an 8-pin SOIC package, while UPD78F9502MA-CAC-A is a 10-pin LSSOP package. PCB layout modification is required.

Q: What is the minimum supply voltage for each part?

A: UPD78F9502MA-CAC-A and R5F10Y17ASP#30 both require minimum 2V. ATTINY402-SSNR operates at a lower minimum of 1.8V, providing extended low-voltage capability.

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