ATMEGA168-20PI Equivalent & Substitute Parts

Part Overview

The ATMEGA168-20PI is an 8-bit AVR microcontroller manufactured by Microchip Technology, featuring 16KB of FLASH program memory, 1KB of RAM, and 512 bytes of EEPROM. This device operates at 20MHz with a supply voltage range of 2.7V to 5.5V and includes integrated peripherals such as I2C, SPI, UART/USART connectivity, PWM, watchdog timer, and brown-out detection. The part is mounted in a 28-pin DIP package through-hole configuration.

The ATMEGA168-20PI is classified as obsolete. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain flexibility, and support long-term product availability for applications currently utilizing this microcontroller.

Substiute Parts

ATMEGA168-20PI

Microchip TechnologyIn Stock: 1071ATMEGA168-20PI Datasheet

Current PartRFQ

ATMEGA168-20PU

Microchip TechnologyIn Stock: 5000275ATMEGA168-20PU Datasheet

DirectRFQ

ATMEGA168P-20PU

Microchip TechnologyIn Stock: 1054ATMEGA168P-20PU Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ATMEGA168-20PI are identified based on strict equivalence of the following critical parameters:

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 20MHz
• Program Memory Size: 16KB (8K x 16)
• Program Memory Type: FLASH
• RAM Size: 1K x 8
• EEPROM Size: 512 x 8
• Voltage Supply Range: 2.7V ~ 5.5V
• Data Converters: A/D 6x10b
• Number of I/O: 23
• Connectivity: I2C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Operating Temperature: -40°C ~ 85°C (TA)
• Mounting Type: Through Hole
• Package / Case: 28-DIP (0.300", 7.62mm)

Two substitute parts meet these criteria with identical electrical and mechanical specifications. Differences exist only in packaging format and product status.

Parameter Comparison

Engineering Selection Recommendations

ATMEGA168-20PU is the primary substitute for ATMEGA168-20PI. Both parts are electrically and mechanically identical with matching core specifications, memory configuration, I/O count, and peripheral set. The ATMEGA168-20PU holds Active product status and carries ROHS3 compliance, providing superior supply chain availability and regulatory alignment compared to the obsolete ATMEGA168-20PI.

ATMEGA168P-20PU is a secondary parametric equivalent. This part maintains identical electrical and mechanical specifications but is classified as Obsolete. ROHS3 compliance is present; however, limited inventory availability may restrict its practical application as a long-term substitute.

For new designs or production continuity requiring an active, readily available part, ATMEGA168-20PU is the recommended selection. Both substitute parts are pin-compatible and functionally equivalent for applications currently using ATMEGA168-20PI.

Frequently Asked Questions (FAQ)

Q: Are ATMEGA168-20PU and ATMEGA168P-20PU direct pin-for-pin replacements for ATMEGA168-20PI?

A: Yes. All three parts share identical 28-pin DIP package configuration, pin assignments, and electrical specifications. No PCB layout modifications are required for substitution.

Q: What is the difference between ATMEGA168-20PI and ATMEGA168-20PU?

A: The primary difference is packaging format. ATMEGA168-20PI uses tube packaging, while ATMEGA168-20PU also uses tube packaging. Both are electrically identical. ATMEGA168-20PU has Active product status and ROHS3 compliance, whereas ATMEGA168-20PI is Obsolete and RoHS non-compliant.

Q: Why is ATMEGA168-20PU preferred over ATMEGA168P-20PU?

A: ATMEGA168-20PU maintains Active product status with significantly higher inventory availability (5,000,200 units in stock) compared to ATMEGA168P-20PU (1,021 units in stock). Both are ROHS3 compliant and electrically equivalent; however, ATMEGA168-20PU provides superior supply chain reliability.

Q: Can ATMEGA168-20PI be used interchangeably with ATMEGA168-20PU in existing applications?

A: Yes. The parts are functionally equivalent with identical electrical characteristics, memory specifications, and peripheral functionality. Existing firmware and hardware designs require no modification.

Q: Are there any compliance differences between these parts?

A: ATMEGA168-20PI is RoHS non-compliant. Both ATMEGA168-20PU and ATMEGA168P-20PU are ROHS3 compliant. All three parts are REACH Unaffected. For applications requiring RoHS compliance, ATMEGA168-20PU or ATMEGA168P-20PU must be selected.

Q: What is the significance of the "P" designation in ATMEGA168P-20PU?

A: The "P" designation indicates a picoPower variant. However, all three parts maintain identical electrical specifications, memory configuration, and operating parameters as provided in the technical data.