AT90LS2343-1PI Equivalent & Substitute Parts

Part Overview

The AT90LS2343-1PI is an 8-bit AVR microcontroller from Microchip Technology's AVR 90LS series, featuring 2KB of FLASH program memory, 128 bytes of EEPROM, and 128 bytes of RAM. Designed for embedded applications requiring low-speed operation at 1MHz with a supply voltage range of 2.7V to 6V, this device integrates brown-out detection, power-on reset, and watchdog timer functionality in an 8-PDIP package.

The AT90LS2343-1PI is classified as obsolete. Locating equivalent or substitute components is necessary to support legacy system maintenance, design updates, or when original inventory becomes unavailable. Substitute parts must maintain functional compatibility across core processor architecture, memory configuration, package type, and operating temperature range.

Substiute Parts

AT90LS2343-1PI

Microchip TechnologyIn Stock: 721AT90LS2343-1PI Datasheet

Current PartRFQ

ATTINY25V-10PU

Microchip TechnologyIn Stock: 5149ATTINY25V-10PU Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the AT90LS2343-1PI is determined by the following critical parameters:

• Core Processor Architecture: Must be AVR to ensure instruction set compatibility and firmware portability
• Core Size: Must remain 8-Bit for register and instruction compatibility
• Program Memory Configuration: Must provide minimum 2KB (1K x 16) FLASH to accommodate existing firmware
• Memory Type: FLASH program memory is mandatory; EEPROM and RAM must match or exceed 128 x 8 bytes
• Package Type: Must be 8-PDIP (0.300", 7.62mm) for PCB layout compatibility and through-hole mounting
• Operating Temperature Range: Must support -40°C to 85°C minimum to maintain thermal specification compliance
• Supply Voltage: Substitute must operate within or encompass the 2.7V to 6V range

The ATTINY25V-10PU meets these substitution criteria while offering enhanced capabilities including higher clock speed (10MHz), expanded I/O count (6 vs. 5), integrated analog-to-digital conversion, and active product status with current manufacturing support.

Parameter Comparison

Engineering Selection Recommendations

The ATTINY25V-10PU is a direct functional substitute for the AT90LS2343-1PI based on the following engineering criteria:

Product Status and Availability: The AT90LS2343-1PI is obsolete with no active manufacturing. The ATTINY25V-10PU maintains active product status with current production and established supply chain availability, ensuring long-term component sourcing for new designs and legacy system support.

Regulatory Compliance: The ATTINY25V-10PU is ROHS3 compliant, meeting current environmental and hazardous substance restrictions. The original AT90LS2343-1PI is RoHS non-compliant, making the substitute the appropriate choice for applications requiring regulatory adherence.

Electrical and Functional Compatibility: Both devices share identical core architecture (AVR 8-Bit), memory configuration (2KB FLASH, 128 bytes EEPROM and RAM), package type (8-PDIP), and operating temperature range (-40°C to 85°C). The ATTINY25V-10PU operates at 10MHz versus 1MHz, providing performance headroom without requiring firmware modification. The supply voltage range of the substitute (1.8V to 5.5V) overlaps the original specification (2.7V to 6V) within the 2.7V to 5.5V common operating window.

Physical and Mechanical Compatibility: Identical 8-DIP package dimensions (0.300", 7.62mm) ensure direct PCB footprint compatibility and through-hole mounting without layout changes.

Frequently Asked Questions (FAQ)

Q: Can the ATTINY25V-10PU directly replace the AT90LS2343-1PI without firmware changes?

A: Yes. Both devices use the AVR instruction set architecture and share identical memory organization (2KB FLASH, 128 bytes EEPROM, 128 bytes RAM). Existing firmware compiled for the AT90LS2343-1PI will execute on the ATTINY25V-10PU. The higher clock speed (10MHz vs. 1MHz) may affect timing-dependent code; review any delay loops or timing-critical sections to ensure they remain valid at the faster clock rate.

Q: Are there supply voltage considerations when substituting?

A: The AT90LS2343-1PI operates from 2.7V to 6V. The ATTINY25V-10PU operates from 1.8V to 5.5V. The overlapping range is 2.7V to 5.5V. If your application requires operation above 5.5V, the substitute cannot be used. Verify your actual supply voltage specification before substitution.

Q: Does the ATTINY25V-10PU have the same peripheral set?

A: Both devices include brown-out detection/reset, power-on reset, and watchdog timer. The ATTINY25V-10PU adds PWM capability and a 4-channel 10-bit analog-to-digital converter, which the AT90LS2343-1PI does not have. These additional features do not interfere with existing firmware and may be utilized in updated designs.

Q: Is the 8-DIP package identical between both parts?

A: Yes. Both use 8-DIP (0.300", 7.62mm) through-hole packaging. Pin assignments and PCB footprints are identical, allowing direct socket substitution without layout modifications.

Q: What is the significance of the ATTINY25V-10PU being ROHS3 compliant?

A: ROHS3 compliance indicates the substitute meets current environmental regulations restricting hazardous substances (lead, cadmium, mercury, etc.). The original AT90LS2343-1PI is RoHS non-compliant. For new designs, regulatory applications, or procurement policies requiring RoHS compliance, the ATTINY25V-10PU is the appropriate choice.

Q: Can I use the ATTINY25V-10PU in legacy systems designed for the AT90LS2343-1PI?

A: Yes. The identical package, pinout, memory configuration, and instruction set ensure functional compatibility. Verify that your application's timing requirements are satisfied at the higher 10MHz clock speed. No PCB modifications are required.