ATTINY25-20PI Equivalent & Substitute Parts

Part Overview

The ATTINY25-20PI is an 8-bit AVR microcontroller from Microchip Technology's ATtiny family, featuring 2KB of FLASH program memory, 128 bytes of EEPROM, and 128 bytes of RAM. This device is designed for embedded applications requiring low-power operation and minimal pin count. The part is currently listed as obsolete, making identification of compatible substitutes essential for ongoing production and maintenance applications.

Key Parameters

Parameter	Value
Manufacturer	Microchip Technology
Core Processor	AVR
Core Size	8-Bit
Speed	20MHz
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 ~ 5.5V
Number of I/O	6
Data Converters	A/D 4x10b
Connectivity	USI
Peripherals	Brown-out Detect/Reset, POR, PWM, WDT
Oscillator Type	Internal
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Through Hole
Package / Case	8-DIP (0.300", 7.62mm)
Supplier Device Package	8-PDIP

Substitute Part Grouping Explanation

Substitution of the ATTINY25-20PI is determined by strict equivalence across the following critical parameters:

Processor Architecture: AVR core compatibility
Memory Configuration: 2KB FLASH, 128 bytes EEPROM, 128 bytes RAM
Electrical Specifications: 20MHz operation, 2.7V ~ 5.5V supply voltage range
Pin Configuration: 8-PDIP package with 6 I/O pins
Peripheral Set: Identical Brown-out Detect/Reset, POR, PWM, WDT, USI connectivity, and 4x10-bit A/D converters
Operating Temperature Range: -40°C ~ 85°C

The ATTINY25-20PU meets all these criteria and is identified as a direct substitute. The primary difference between these parts is packaging format and product status, not functional or electrical characteristics.

Parameter Comparison

Parameter	ATTINY25-20PI	ATTINY25-20PU	Match
Manufacturer	Microchip Technology	Microchip Technology	✓
Core Processor	AVR	AVR	✓
Core Size	8-Bit	8-Bit	✓
Speed	20MHz	20MHz	✓
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 ~ 5.5V	2.7V ~ 5.5V	✓
Number of I/O	6	6	✓
Data Converters	A/D 4x10b	A/D 4x10b	✓
Connectivity	USI	USI	✓
Peripherals	Brown-out Detect/Reset, POR, PWM, WDT	Brown-out Detect/Reset, POR, PWM, WDT	✓
Oscillator Type	Internal	Internal	✓
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	✓
Mounting Type	Through Hole	Through Hole	✓
Package / Case	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	✓
Supplier Device Package	8-PDIP	8-PDIP	✓
Product Status	Obsolete	Active	—
RoHS Status	RoHS non-compliant	ROHS3 Compliant	—

Engineering Selection Recommendations

The ATTINY25-20PU is a direct functional equivalent to the ATTINY25-20PI. Both parts share identical electrical specifications, memory configuration, peripheral set, and physical package dimensions. Selection between these parts should be based on the following criteria:

Product Status: The ATTINY25-20PI is obsolete, while the ATTINY25-20PU maintains active production status. For new designs or ongoing production requiring long-term component availability, the ATTINY25-20PU is the appropriate choice.

Compliance Requirements: The ATTINY25-20PU is ROHS3 compliant, whereas the ATTINY25-20PI is RoHS non-compliant. Applications subject to RoHS regulations must use the ATTINY25-20PU.

Packaging Format: The ATTINY25-20PI is supplied in standard packaging, while the ATTINY25-20PU is supplied in tube packaging. Packaging format does not affect functional performance and is determined by procurement and handling requirements.

Both parts carry identical REACH and ECCN classifications (REACH Unaffected, EAR99), indicating equivalent regulatory standing for export and environmental compliance purposes.

Frequently Asked Questions (FAQ)

Q: Can the ATTINY25-20PU directly replace the ATTINY25-20PI in existing designs?

A: Yes. The ATTINY25-20PU is functionally and electrically identical to the ATTINY25-20PI. Both parts feature the same AVR core, 20MHz operation, 2KB FLASH memory, 128 bytes EEPROM, 128 bytes RAM, 6 I/O pins, and identical peripheral set. The 8-PDIP package dimensions are identical, allowing direct PCB substitution without layout modifications.

Q: What is the primary reason to switch from ATTINY25-20PI to ATTINY25-20PU?

A: The ATTINY25-20PI is listed as obsolete, making long-term availability uncertain. The ATTINY25-20PU maintains active production status and is ROHS3 compliant, making it the recommended choice for new designs and ongoing production.

Q: Are there any electrical or performance differences between these parts?

A: No. Both parts operate at identical voltage ranges (2.7V ~ 5.5V), maximum frequency (20MHz), operating temperature range (-40°C ~ 85°C), and feature the same peripheral configuration including Brown-out Detect/Reset, POR, PWM, WDT, USI connectivity, and 4x10-bit A/D converters.

Q: Does the packaging difference between ATTINY25-20PI and ATTINY25-20PU affect compatibility?

A: No. The packaging difference refers only to supplier delivery format (standard versus tube). Both parts use the 8-PDIP physical package with identical pin spacing (0.300", 7.62mm) and pin configuration, ensuring mechanical and electrical compatibility on PCBs.

Q: What compliance certifications apply to both parts?

A: Both ATTINY25-20PI and ATTINY25-20PU carry identical REACH (REACH Unaffected) and ECCN (EAR99) classifications. The ATTINY25-20PU additionally carries ROHS3 compliance certification, which the ATTINY25-20PI does not possess.

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