AT90LS2343-4SC Equivalent & Substitute Parts

Part Overview

The AT90LS2343-4SC is an 8-bit AVR microcontroller from Microchip Technology's AVR 90LS series, featuring 2KB FLASH program memory, 128 bytes each of EEPROM and RAM, and operating at 4MHz. The device is packaged in 8-SOIC surface mount configuration with a supply voltage range of 2.7V to 6V and operating temperature range of 0°C to 70°C.

This part is classified as obsolete. Identifying suitable substitute components is necessary to support legacy system maintenance, design updates, and continued product availability for applications where the AT90LS2343-4SC is currently deployed.

Substiute Parts

AT90LS2343-4SC

Microchip TechnologyIn Stock: 1337AT90LS2343-4SC Datasheet

Current PartRFQ

ATTINY25V-10SU

Microchip TechnologyIn Stock: 22738ATTINY25V-10SU Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the AT90LS2343-4SC is determined by the following critical parameters:

• Core Architecture: AVR processor family compatibility
• Memory Configuration: Minimum 2KB FLASH program memory, 128 bytes EEPROM, 128 bytes RAM
• Package Type: 8-SOIC surface mount form factor with identical 0.209" (5.30mm) width
• Pin Count: 8-pin configuration
• Supply Voltage Range: Must accommodate the original 2.7V to 6V specification or provide compatible operating range
• I/O Count: Minimum 5 I/O pins required

The ATTINY25V-10SU meets these substitution criteria while offering enhanced specifications including higher clock speed (10MHz), extended temperature range (-40°C to 85°C), improved voltage range (1.8V to 5.5V), and active product status with RoHS3 compliance.

Parameter Comparison

Engineering Selection Recommendations

The ATTINY25V-10SU is a qualified substitute for the AT90LS2343-4SC based on the following engineering criteria:

Memory and Architecture Compatibility: Both devices feature identical 2KB FLASH program memory, 128-byte EEPROM, and 128-byte RAM configurations with AVR core architecture, ensuring firmware compatibility for applications designed for the original part.

Package and Pinout Equivalence: Both components utilize the 8-SOIC surface mount package with identical 0.209" (5.30mm) width, enabling direct PCB layout compatibility without redesign.

Product Status and Supply Chain: The AT90LS2343-4SC is obsolete with limited availability. The ATTINY25V-10SU is actively manufactured by Microchip Technology with verified inventory levels, ensuring long-term supply chain reliability.

Compliance and Certification: The ATTINY25V-10SU is ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements. The original part is RoHS non-compliant, making the substitute preferable for new designs and regulatory compliance.

Performance Enhancement: The substitute operates at 10MHz versus 4MHz, providing 2.5x performance improvement while maintaining backward compatibility with existing firmware. Extended operating temperature range (-40°C to 85°C) and lower minimum supply voltage (1.8V) expand application flexibility.

Frequently Asked Questions (FAQ)

Q: Can the ATTINY25V-10SU directly replace the AT90LS2343-4SC without PCB modifications?

A: Yes. Both devices share identical 8-SOIC package dimensions and pinout configuration. Direct component substitution on existing PCBs is possible without layout changes.

Q: Are there firmware compatibility concerns when switching from AT90LS2343-4SC to ATTINY25V-10SU?

A: No firmware modifications are required. Both devices feature identical memory configurations (2KB FLASH, 128-byte EEPROM, 128-byte RAM) and AVR core architecture. Existing compiled firmware is compatible. The higher clock speed (10MHz vs 4MHz) may affect timing-dependent code; review timing-critical sections if present.

Q: What is the voltage supply compatibility between these parts?

A: The AT90LS2343-4SC operates at 2.7V to 6V. The ATTINY25V-10SU operates at 1.8V to 5.5V. The substitute supports lower minimum voltage but has a slightly reduced maximum voltage. For applications operating at 6V, verify that the ATTINY25V-10SU's 5.5V maximum is acceptable for your design.

Q: Does the ATTINY25V-10SU offer additional features beyond the AT90LS2343-4SC?

A: Yes. The substitute includes PWM capability, A/D converter (4x10-bit), and one additional I/O pin (6 vs 5). These features are backward compatible; existing applications will function without utilizing the additional capabilities.

Q: What is the difference between the connectivity specifications (SPI vs USI)?

A: The AT90LS2343-4SC features SPI (Serial Peripheral Interface). The ATTINY25V-10SU features USI (Universal Serial Interface), which provides SPI-compatible functionality plus additional serial communication options. USI is a superset of SPI capability.

Q: Is the ATTINY25V-10SU suitable for applications requiring the full 0°C to 70°C temperature range of the original part?

A: Yes. The ATTINY25V-10SU operates across -40°C to 85°C, which fully encompasses the original 0°C to 70°C specification. The extended range provides additional margin for extreme operating conditions.