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ATMEGA8-16PI Equivalent & Substitute Parts
Part Overview
The ATMEGA8-16PI is an 8-bit AVR microcontroller manufactured by Microchip Technology, featuring 8KB of FLASH program memory, 1KB of RAM, and 512 bytes of EEPROM. This device operates at 16MHz with integrated peripherals including I2C, SPI, and UART/USART connectivity, along with brown-out detection, power-on reset, PWM, and watchdog timer functionality. The part is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and production continuity.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Core Processor | AVR |
| Core Size | 8-Bit |
| Speed | 16MHz |
| Program Memory Size | 8KB (4K x 16) |
| Program Memory Type | FLASH |
| RAM Size | 1K x 8 |
| EEPROM Size | 512 x 8 |
| Number of I/O | 23 |
| Voltage Supply (Vcc/Vdd) | 4.5V ~ 5.5V |
| Data Converters | A/D 6x10b |
| 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) |
Substitute Part Grouping Explanation
Substitution of the ATMEGA8-16PI is determined by strict equivalence across the following critical parameters:
- Core Architecture: AVR processor family
- Memory Configuration: 8KB FLASH, 1KB RAM, 512 bytes EEPROM
- Clock Speed: 16MHz operation
- I/O Count: 23 I/O pins
- Peripheral Set: I2C, SPI, UART/USART, brown-out detection, PWM, watchdog timer
- Voltage Range: 4.5V to 5.5V supply
- Package Type: 28-DIP through-hole form factor
- Pin Compatibility: Identical pinout and electrical characteristics
The ATMEGA8-16PU meets all substitution criteria as a direct functional equivalent with identical electrical specifications and pinout.
Parameter Comparison
| Parameter | ATMEGA8-16PI | ATMEGA8-16PU |
|---|---|---|
| Manufacturer | Microchip Technology | Microchip Technology |
| Core Processor | AVR | AVR |
| Core Size | 8-Bit | 8-Bit |
| Speed | 16MHz | 16MHz |
| Program Memory Size | 8KB (4K x 16) | 8KB (4K x 16) |
| Program Memory Type | FLASH | FLASH |
| RAM Size | 1K x 8 | 1K x 8 |
| EEPROM Size | 512 x 8 | 512 x 8 |
| Number of I/O | 23 | 23 |
| Voltage Supply (Vcc/Vdd) | 4.5V ~ 5.5V | 4.5V ~ 5.5V |
| Data Converters | A/D 6x10b | A/D 6x10b |
| Connectivity | I2C, SPI, UART/USART | I2C, SPI, UART/USART |
| Peripherals | Brown-out Detect/Reset, POR, PWM, WDT | Brown-out Detect/Reset, POR, PWM, WDT |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) |
| Mounting Type | Through Hole | Through Hole |
| Package / Case | 28-DIP (0.300", 7.62mm) | 28-DIP (0.300", 7.62mm) |
| Product Status | Obsolete | Active |
| RoHS Status | RoHS non-compliant | ROHS3 Compliant |
Engineering Selection Recommendations
The ATMEGA8-16PU is the direct substitute for the ATMEGA8-16PI. Both parts share identical electrical specifications, memory configuration, peripheral set, and 28-DIP pinout. The primary distinction is product lifecycle status: the ATMEGA8-16PI is obsolete, while the ATMEGA8-16PU maintains active production status with current availability.
The ATMEGA8-16PU additionally provides ROHS3 compliance, meeting modern environmental and regulatory requirements. The ATMEGA8-16PI is RoHS non-compliant. For new designs or production requiring regulatory compliance, the ATMEGA8-16PU is the appropriate selection. For legacy system maintenance where RoHS compliance is not a requirement, either part functions identically within the application circuit.
Frequently Asked Questions (FAQ)
Q: Are ATMEGA8-16PI and ATMEGA8-16PU pin-compatible?
A: Yes. Both parts use the 28-DIP package with identical pinout and electrical characteristics. Direct socket substitution is possible without circuit modification.
Q: What is the difference between the PI and PU package designations?
A: The package designation indicates the tape and reel format. PI and PU both refer to 28-DIP through-hole packages but differ in packaging method. This does not affect electrical performance or pinout compatibility.
Q: Can I use ATMEGA8-16PU in a design originally specified for ATMEGA8-16PI?
A: Yes. The ATMEGA8-16PU is functionally and electrically equivalent. All memory, peripheral, timing, and I/O specifications are identical. The circuit will operate without modification.
Q: Why is ATMEGA8-16PI listed as obsolete?
A: Microchip Technology has transitioned production to the ATMEGA8-16PU. The ATMEGA8-16PI remains available from existing inventory but is no longer manufactured.
Q: Does the RoHS compliance difference affect circuit operation?
A: No. RoHS compliance relates to material composition and environmental standards, not electrical performance. Both parts function identically within the application circuit.
Q: Are there any thermal or reliability differences between these parts?
A: No. Both parts share identical operating temperature range (-40°C to 85°C) and thermal characteristics. Reliability and lifespan are equivalent.
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