ATTINY22L-1PI Equivalent & Substitute Parts

Part Overview

The ATTINY22L-1PI is an 8-bit AVR microcontroller manufactured by Microchip Technology, featuring 2KB FLASH program memory, 128 bytes EEPROM, and 128 bytes RAM. Designed for embedded applications requiring low-power operation across a 2.7V to 6V supply range, this device operates at 1MHz with integrated peripherals including Power-On Reset (POR) and Watchdog Timer (WDT). The ATTINY22L-1PI is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements.

Substiute Parts

ATTINY22L-1PI

Microchip TechnologyIn Stock: 957ATTINY22L-1PI Datasheet

Current PartRFQ

ATTINY25-20PU

Microchip TechnologyIn Stock: 2359ATTINY25-20PU Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ATTINY22L-1PI is determined by the following critical parameters:

• Core Architecture: AVR 8-bit processor compatibility
• Memory Configuration: 2KB FLASH program memory, 128 x 8 EEPROM, 128 x 8 RAM
• Package Format: 8-DIP (0.300", 7.62mm) through-hole mounting
• Voltage Supply Range: Minimum 2.7V operation capability
• Operating Temperature Range: -40°C to 85°C support
• Peripheral Set: Compatibility with POR and WDT functions

The ATTINY25-20PU qualifies as a direct substitute based on matching core architecture, identical memory specifications, compatible package format, overlapping voltage supply range (2.7V ~ 5.5V), and equivalent operating temperature range. The substitute maintains functional compatibility while offering enhanced performance characteristics and active product status.

Parameter Comparison

Engineering Selection Recommendations

The ATTINY25-20PU is the qualified substitute for the obsolete ATTINY22L-1PI based on the following engineering criteria:

Product Status: The ATTINY22L-1PI is classified as obsolete, creating supply chain risk. The ATTINY25-20PU maintains active product status with verified availability, ensuring long-term procurement viability.

Regulatory Compliance: The ATTINY25-20PU achieves ROHS3 compliance, whereas the ATTINY22L-1PI is non-compliant. This compliance status is critical for applications subject to environmental and regulatory requirements.

Memory and Architecture Compatibility: Both devices share identical core architecture (AVR 8-bit), program memory (2KB FLASH), EEPROM (128 x 8), and RAM (128 x 8) specifications, ensuring software and firmware compatibility.

Package and Pinout: Both devices utilize the 8-DIP (0.300", 7.62mm) through-hole package format, enabling direct PCB layout compatibility without redesign.

Voltage Supply Range: The ATTINY25-20PU operates within 2.7V ~ 5.5V, which overlaps the ATTINY22L-1PI range of 2.7V ~ 6V. Applications operating above 5.5V require voltage regulation or alternative solutions.

Operating Temperature: Both devices support the identical -40°C to 85°C operating temperature range, maintaining thermal compatibility.

Frequently Asked Questions (FAQ)

Q: Can the ATTINY25-20PU directly replace the ATTINY22L-1PI without PCB modifications?

A: Yes. Both devices use the 8-DIP (0.300", 7.62mm) package format with compatible through-hole mounting. No PCB layout changes are required for physical installation.

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

A: The primary differences are operating speed (1MHz vs. 20MHz), product status (obsolete vs. active), and regulatory compliance (non-compliant vs. ROHS3 compliant). Memory configurations and core architecture are identical.

Q: Is the ATTINY25-20PU suitable for applications requiring 6V supply operation?

A: The ATTINY25-20PU maximum supply voltage is 5.5V. Applications requiring 6V operation must implement voltage regulation to reduce supply voltage to the 2.7V ~ 5.5V range or select alternative components rated for higher voltages.

Q: Are there firmware compatibility concerns when switching from ATTINY22L-1PI to ATTINY25-20PU?

A: No firmware modifications are required. Both devices share the AVR core architecture and identical memory specifications. Existing firmware compiled for the ATTINY22L-1PI will execute on the ATTINY25-20PU without changes.

Q: What is the significance of the ROHS3 compliance difference?

A: ROHS3 compliance indicates the ATTINY25-20PU meets current environmental and hazardous substance restrictions. The ATTINY22L-1PI non-compliance status may restrict use in regulated markets or applications with environmental requirements.

Q: Can the higher operating speed of the ATTINY25-20PU cause compatibility issues?

A: The ATTINY25-20PU operates at 20MHz versus 1MHz for the ATTINY22L-1PI. Applications designed for 1MHz operation will function correctly at 20MHz. However, timing-sensitive applications or those with specific clock-dependent requirements should be evaluated for the new operating speed.