ATTINY85-20PI Equivalent & Substitute Parts

Part Overview

The ATTINY85-20PI is an 8-bit AVR microcontroller from Microchip Technology's ATtiny family, featuring 8KB of FLASH program memory, 512 bytes of EEPROM, and 512 bytes of RAM. This device operates at 20MHz with a supply voltage range of 2.7V to 5.5V and includes integrated peripherals such as brown-out detection, power-on reset, PWM, and watchdog timer functionality. The part is currently listed as obsolete, necessitating identification of active equivalent alternatives for new designs and ongoing production requirements.

Substiute Parts

ATTINY85-20PI

Microchip TechnologyIn Stock: 1205ATTINY85-20PI Datasheet

Current PartRFQ

ATTINY85-20PU

Microchip TechnologyIn Stock: 15730ATTINY85-20PU Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ATTINY85-20PI is determined by strict equivalence across the following critical parameters:

• Core Architecture: AVR processor family
• Memory Configuration: 8KB FLASH, 512 bytes EEPROM, 512 bytes RAM
• Operating Frequency: 20MHz
• Supply Voltage Range: 2.7V ~ 5.5V
• I/O Count: 6 pins
• Peripheral Set: Brown-out Detect/Reset, POR, PWM, WDT
• Package Type: 8-PDIP through-hole configuration
• Temperature Range: -40°C ~ 85°C

The ATTINY85-20PU meets all electrical and mechanical substitution criteria. The primary difference is packaging format (tube versus DIP) and product status (active versus obsolete), with no variation in functional specifications or pinout.

Parameter Comparison

Engineering Selection Recommendations

The ATTINY85-20PU is the direct functional equivalent of the ATTINY85-20PI. Both devices share identical electrical specifications, memory configuration, peripheral set, and pinout. Selection between these parts is determined by product lifecycle and regulatory compliance requirements:

ATTINY85-20PI is obsolete and should not be selected for new designs or production runs requiring long-term component availability.

ATTINY85-20PU is the active equivalent and is recommended for all new applications. This part maintains full electrical and mechanical compatibility while offering ROHS3 compliance, addressing modern regulatory requirements. Inventory availability is significantly higher (15,649 units versus 1,130 units), supporting production continuity.

Frequently Asked Questions (FAQ)

Q: Are ATTINY85-20PI and ATTINY85-20PU pin-for-pin compatible?

A: Yes. Both devices use the 8-PDIP package with identical pinout and electrical characteristics. No circuit modifications are required for substitution.

Q: What is the difference between the PI and PU package designations?

A: The PI designation indicates DIP packaging, while PU indicates tube packaging. Both use the same 8-PDIP physical form factor. The difference is in the delivery and storage format.

Q: Can ATTINY85-20PU be used in existing designs originally specified for ATTINY85-20PI?

A: Yes. The ATTINY85-20PU is a direct substitute with identical functional specifications, memory configuration, and operating parameters. No design changes are necessary.

Q: Why is ATTINY85-20PI listed as obsolete?

A: Product obsolescence is determined by the manufacturer. The ATTINY85-20PU remains in active production and is the current equivalent offering from Microchip Technology.

Q: Does ROHS3 compliance affect electrical performance?

A: No. ROHS3 compliance reflects manufacturing process and material composition standards. Electrical specifications, performance characteristics, and operating parameters remain unchanged.

Q: Are there any thermal or reliability differences between these parts?

A: No. Both parts operate across the same temperature range (-40°C to 85°C) and share identical peripheral functionality and reliability characteristics.