S908AZ60AH3CFUE Equivalent & Substitute Parts

Part Overview

The S908AZ60AH3CFUE is an 8-bit HC08 microcontroller manufactured by NXP USA Inc., featuring 60KB FLASH memory, 2KB RAM, and 1KB EEPROM. This device operates at 8MHz with integrated CANbus, SCI, and SPI connectivity, housed in a 64-QFP package. The product is classified as Not For New Designs, indicating end-of-life status. Identifying equivalent substitute parts is necessary for ongoing system maintenance, legacy design support, and supply chain continuity when original inventory becomes unavailable.

Substiute Parts

S908AZ60AH3CFUE

NXP USA Inc.In Stock: 1219S908AZ60AH3CFUE Datasheet

Current PartRFQ

AT90CAN64-16AU

Microchip TechnologyIn Stock: 5159AT90CAN64-16AU Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the S908AZ60AH3CFUE is determined by the following critical parameters:

• 8-bit microcontroller architecture with comparable processing capability
• Program memory capacity of 60KB or greater
• RAM and EEPROM availability meeting or exceeding 2KB and 1KB respectively
• CANbus connectivity as a mandatory interface requirement
• 64-pin QFP package with 14x14mm footprint for PCB compatibility
• Operating voltage range supporting 4.5V to 5.5V supply
• Temperature range of -40°C to 85°C
• RoHS3 compliance for regulatory alignment

The AT90CAN64-16AU meets these substitution criteria through equivalent package geometry, enhanced memory specifications, and integrated CANbus functionality.

Parameter Comparison

Engineering Selection Recommendations

The AT90CAN64-16AU serves as a functional substitute for the S908AZ60AH3CFUE based on the following engineering criteria:

Compliance and Regulatory Status: Both devices maintain ROHS3 compliance and identical REACH/ECCN classifications (EAR99), ensuring regulatory continuity in applications requiring these certifications.

Product Lifecycle: The AT90CAN64-16AU holds Active product status, providing long-term availability and supply chain stability compared to the Not For New Designs classification of the S908AZ60AH3CFUE.

Memory and Performance Specifications: The substitute provides enhanced program memory (64KB versus 60KB), doubled RAM capacity (4K x 8 versus 2K x 8), and doubled EEPROM (2K x 8 versus 1K x 8). The increased clock speed (16MHz versus 8MHz) delivers improved processing performance while maintaining backward compatibility with 8-bit instruction sets.

Package and Pinout Compatibility: Both devices utilize 64-pin packages with identical 14x14mm footprints. The QFP-to-TQFP transition maintains PCB layout compatibility with minimal rework requirements.

Connectivity and Peripherals: The AT90CAN64-16AU retains mandatory CANbus functionality while providing additional interfaces (I2C, UART/USART, EBI/EMI) and enhanced peripheral support (Brown-out Detect/Reset, WDT), enabling expanded system integration without sacrificing core functionality.

Voltage and Temperature Operating Ranges: The substitute supports an extended lower voltage threshold (2.7V minimum versus 4.5V), while maintaining the identical upper limit and temperature range, providing operational flexibility in diverse application environments.

Frequently Asked Questions (FAQ)

Q: Can the AT90CAN64-16AU directly replace the S908AZ60AH3CFUE without firmware modifications?

A: Direct pin-for-pin replacement is possible due to identical 64-QFP/TQFP package geometry and pinout compatibility. However, firmware adaptation is required due to architectural differences between HC08 and AVR instruction sets. The substitute's enhanced memory and performance characteristics do not prevent functional substitution in CANbus-dependent applications.

Q: What are the key differences in memory architecture between these devices?

A: The S908AZ60AH3CFUE provides 60KB program memory, 2KB RAM, and 1KB EEPROM. The AT90CAN64-16AU offers 64KB program memory, 4KB RAM, and 2KB EEPROM. These increased capacities accommodate more complex firmware implementations and larger data structures without architectural limitations.

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

A: Both devices use 64-pin packages with 14x14mm footprints. The transition from QFP to TQFP involves minor lead geometry differences but maintains identical PCB land patterns and spacing. Standard reflow soldering processes accommodate both package types without design modifications.

Q: How does the voltage supply range difference affect system design?

A: The S908AZ60AH3CFUE requires 4.5V to 5.5V supply, while the AT90CAN64-16AU operates from 2.7V to 5.5V. The substitute's extended lower voltage range enables operation in battery-powered or low-voltage applications without additional regulation circuitry, provided the upper 5.5V limit is maintained.

Q: What connectivity features are preserved in the substitute?

A: CANbus, SPI, and serial communication capabilities are retained in the AT90CAN64-16AU. The substitute adds I2C, UART/USART, and EBI/EMI interfaces, expanding system integration options while maintaining compatibility with existing CANbus network implementations.

Q: Does the increased clock speed (16MHz versus 8MHz) require system timing adjustments?

A: The doubled clock speed improves instruction execution rates and reduces processing latency. Existing firmware timing loops and delay routines require recalibration to maintain equivalent real-time behavior. Interrupt service routines and peripheral timing configurations must be adjusted proportionally to the 2x frequency increase.

Q: Are there data converter differences that affect analog signal processing?

A: The S908AZ60AH3CFUE provides 15 analog input channels with 8-bit resolution. The AT90CAN64-16AU offers 8 analog input channels with 10-bit resolution. Applications requiring multiple analog inputs may require external multiplexing or signal conditioning modifications. The improved 10-bit resolution enhances measurement precision for existing channels.