Marking of AVR microcontrollers

There is quite big variety of AVR microcontrollers that ATMEL company produces. This article is about how to Extract information about AVR microcontroller using its marking on package.

Each microcontroller has its own mark on package: numbers and letters. First is microcontroller type. After follows suffix of three fields.

First field is one or two digits what indicates maximal operation frequency MHz. Second field is a letter showing package type. And third field shows the temperature range of working environment. There are couple more marking letters „L“ and „V“ after microcontroller type. This means that microcontroller operates at low or very low voltages (and frequencies of course).

Table of microcontroller packaging types

Letter	Package	Lead Pitch (mm)
A	TQFP	0.8
J	PLCC	1.27
M	MLF	0.5
P	PDIP	2.54
S	SOIC	1.27
Y	SSOP	0.65

There are two types of operating temperature ranges:

Letter	T, ºC
C	0…70
I	-40…+85

And couple examples at the end:

Marking	VCC, (V)	Fmax, (MHz)	Package
Attiny15L-1PI	2.7-5.5	1.6	8pin PDIP
Atmega64-16AI	4.5-5.5	16	64lead TQFP
Atmega325V-8MC	1.8-5.5	8	64lead MLF
Attiny2313-20SI	2.7-5.5	20	20lead SOIC

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This entry was posted on Thursday, June 22nd, 2006 at 12:32 pm and is filed under AVR Microcontrollers. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.