AT90LS2343-1SC Equivalent & Substitute Parts

Part Overview

The AT90LS2343-1SC 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 1MHz. 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 requiring equivalent or enhanced functionality.

Key Parameters

Parameter	AT90LS2343-1SC
Core Processor	AVR
Core Size	8-Bit
Speed	1MHz
Program Memory Size	2KB (1K x 16)
Program Memory Type	FLASH
EEPROM Size	128 x 8
RAM Size	128 x 8
Voltage - Supply (Vcc/Vdd)	2.7V ~ 6V
Package / Case	8-SOIC (0.209", 5.30mm Width)
Mounting Type	Surface Mount
Operating Temperature	0°C ~ 70°C (TA)
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

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

Core Architecture: AVR processor family
Core Size: 8-Bit
Program Memory: 2KB FLASH minimum
EEPROM/RAM: 128 x 8 bytes minimum
Package: 8-SOIC form factor with identical 0.209" (5.30mm) width
Mounting Type: Surface Mount
Pin Count: 8 pins

The ATTINY25V-10SU meets these core substitution criteria. Both devices share identical program memory capacity (2KB FLASH), EEPROM and RAM sizes (128 x 8), package geometry (8-SOIC), and AVR architecture. The substitute part maintains full pin-count and footprint compatibility, enabling direct replacement in existing PCB designs.

Parameter Comparison

Parameter	AT90LS2343-1SC	ATTINY25V-10SU
Manufacturer	Microchip Technology	Microchip Technology
Core Processor	AVR	AVR
Core Size	8-Bit	8-Bit
Speed	1MHz	10MHz
Program Memory Size	2KB (1K x 16)	2KB (1K x 16)
Program Memory Type	FLASH	FLASH
EEPROM Size	128 x 8	128 x 8
RAM Size	128 x 8	128 x 8
Voltage - Supply (Vcc/Vdd)	2.7V ~ 6V	1.8V ~ 5.5V
Number of I/O	5	6
Connectivity	SPI	USI
Peripherals	Brown-out Detect/Reset, POR, WDT	Brown-out Detect/Reset, POR, PWM, WDT
Oscillator Type	Internal	Internal
Operating Temperature	0°C ~ 70°C (TA)	-40°C ~ 85°C (TA)
Package / Case	8-SOIC (0.209", 5.30mm Width)	8-SOIC (0.209", 5.30mm Width)
Mounting Type	Surface Mount	Surface Mount
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

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

Memory Equivalence: Both devices provide identical 2KB FLASH program memory, 128-byte EEPROM, and 128-byte RAM, ensuring software compatibility for applications developed for the original part.

Package and Footprint Compatibility: Identical 8-SOIC package geometry (0.209" width, 5.30mm) enables direct PCB placement without layout modifications.

Product Status and Availability: The ATTINY25V-10SU is classified as Active with 22,661 units in stock, compared to the obsolete status of the AT90LS2343-1SC. This ensures long-term supply chain continuity and design support.

Compliance and Certification: The ATTINY25V-10SU is ROHS3 compliant, meeting current environmental and regulatory requirements, whereas the original part is RoHS non-compliant.

Enhanced Specifications: The substitute part offers improved operating temperature range (-40°C to 85°C versus 0°C to 70°C), higher clock speed (10MHz versus 1MHz), lower minimum supply voltage (1.8V versus 2.7V), and additional I/O pins (6 versus 5) and peripherals (PWM addition).

Frequently Asked Questions (FAQ)

Q: Can the ATTINY25V-10SU be used as a direct replacement for the AT90LS2343-1SC?

A: Yes. Both devices share identical program memory (2KB FLASH), EEPROM (128 x 8), RAM (128 x 8), and 8-SOIC package geometry. The substitute part is pin-compatible and footprint-compatible, enabling direct PCB replacement without design modifications.

Q: What are the key differences between these two parts?

A: The ATTINY25V-10SU operates at 10MHz compared to 1MHz for the AT90LS2343-1SC, supports a lower minimum supply voltage (1.8V versus 2.7V), provides a wider operating temperature range (-40°C to 85°C versus 0°C to 70°C), includes one additional I/O pin (6 versus 5), and adds PWM peripheral functionality. The substitute part is also ROHS3 compliant and currently in active production.

Q: Are there any voltage supply considerations when substituting?

A: The ATTINY25V-10SU supports a supply voltage range of 1.8V to 5.5V, which overlaps with the original part's 2.7V to 6V range. Applications operating at 2.7V to 5.5V are fully compatible. Applications requiring operation above 5.5V or below 2.7V require design evaluation.

Q: Does the higher clock speed of the substitute part affect software compatibility?

A: Software written for the AT90LS2343-1SC will execute on the ATTINY25V-10SU. The higher clock speed (10MHz) results in faster instruction execution. Applications with timing-dependent code may require adjustment of delay loops or timer configurations to maintain equivalent timing behavior.

Q: What is the significance of the package designation "8-SOIC"?

A: 8-SOIC refers to an 8-pin Small Outline Integrated Circuit package with 0.209 inches (5.30mm) body width. Both the original and substitute parts use this identical package, ensuring mechanical and electrical compatibility on existing PCBs without layout changes.

Q: Is the ATTINY25V-10SU suitable for new designs?

A: Yes. The ATTINY25V-10SU is classified as Active with verified programmability and current production status. It is suitable for both legacy system maintenance and new product development.

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