General notes:

• The C or I after the name is Commercial or Industrial temp.
• The P or N after the name indicates DIP package

Hopefully we (and other nice people) will be able to keep the distributor links current. But if we cant you can always search at http://www.findchips.com or http://www.octopart.com for other distributors such as Arrow, Avnet, Future, Jameco, etc. If you have a non-US distributor you use please add the links below so people outside the US can buy from their local shops.

Please see vreg for regulators & other power converters

Op amps are like the flavor crystals of electronics!

Some notes on op-amps:

• Op amps, of course, vary -widely- but here are some common ones
• The single '741' layout opamps have the same pinout in an 8-DIP package
• The double 'TL082' layout opamps have the same pinout in an 8-DIP package
• The quad 'TL084' layout opamps have the same pinout in a 14-DIP package

Image	Part # & Datasheet	Description	Package notes	Op-amp notes	Distributor	Eagle lib.
	TS922IN or TS922AIN	Rail-to-rail low voltage dual opamp	Dual '082' style	2.7-12V supply Rail-to-rail in & out 50+mA output current	Digikey Mouser	linear:tl082
"	LM741CN	Ye Olde Op amp. This is the 'classic' first internally compensated op-amp. They arent very good but were so popular in older designs, you'll run across them	Single '741' style	10V-46V supply not rail-to-rail	Digikey Mouser	linear:*741
"	Tl082CN	A nice general purpose dual opamp w/JFET inputs	Dual '082' style	6-36V supply Not rail-to-rail	Digikey Mouser	linear:tl082
"	Tl084CN	Quad opamp with JFET inputs (effectively two TL082's)	Quad '084' style	6-36V supply Not rail-to-rail	Digikey Mouser	linear:tl084
"	AD620	An instrumentation amplifier that can be programmed for gains of 1-10,000 with a single resistor.	8 pin DIP or SOIC	±2.3 V to ±18 V, Low noise	Digikey	analog-devices:AD620
PDIP-14/no image yet	LM324N	General purpose quad opamp - same pinout as TL084, but higher PSRR and lower minimum supply voltage. BJT inputs.	Quad '084' style	3-32V supply Not rail-to-rail	Digikey Mouser	linear:lm324

Some notes on timer chips:

• The most common timer chip is the 555, but it comes in a few flavors!
• 555s are commidified, you'll see them made by dozens of manufacturers.
• Pretty much any '555 is pin compatible with different power ratings, voltage ratings, max frequency etc.
• NE555, SE555 LM555 is the 'original' TTL version but is power hungry, and needs 4.5V or higher to run! In general the CMOS versions are better
• The LMC555 /TLC555 is the lighter-weight CMOS version, it can run as low as 1.5V, with much less power dissipation. These are your bread and butter!
• The TLC551CP is ultra low voltage, can run on 1V, making it perfect for single-alkaline-battery operation

Image	Part # & Datasheet	Description	Distributor	Eagle lib.
	LM555CN	TTL, 4.5V-15V @ ~10mA	Mouser Digikey	linear:*555
"	LMC555CN / TLC555CP	CMOS, 1.5-12V @ 0.1mA	Mouser Digikey	linear:*555
"	TLC551CP	CMOS, 1V @ 0.001mA	Digikey Mouser	linear:*555

Some notes on 74' logic chips:

• They are for the most part 1.8-5.5v devices, and can be clocked as fast as 100MHz.
• HC is the most common CMOS logic. AHC has 5V compliant logic even when running with a VCC of 3.3v.
• The N at the end means DIP package, which is what you want for breadboarding.
• There are dozens of manufacturers that may add prefixes, and they're pretty much the same so grab whatever you can! Especially look for MM74HCxxx (fairchild) and SN74HCxxx (texas instruments)

Image	Part # & Datasheet	Description	Distributor	Eagle library
	74HC595N	8-bit serial-to-parallel latch Can be cascaded for controlling dozens of digital outputs	Mouser Digikey
	TPIC6C596N	Just like the 74'595 but is the current sinking version of the 74HC595 Specifically for driving lots of LEDs	Mouser Digikey
	74HC165N	8-bit parallel-to-serial latch Can be cascaded for reading dozens of digital inputs	Digikey Mouser
	74AHC125N	Tri-stateable buffer, 5V compliant We use these for logic level shifting 5v → 3v	Mouser	74xx:74*125
	CD4050	6-channel level shifter, 5V compliant We use these for logic level shifting 5v → 3v	Mouser Digikey	40xx:4050N
	TXB0108	Bi-directional level shifter w/auto-detection	Digikey Mouser	adafruit:TXB0108PWR

Notes on EEPROMS:

• EEPROMs are commodified so the part numbers may vary a little
• EEPROMs are generally I2C (2 wire) - starts with 24, or SPI (3 wire) - starts with 25. SPI is a bit faster but more $.
• I2C and SPI are completely incompatible and if you need one or the other for an existing design you cannot swap them
• They have a voltage range that can be 5V only or 1.8-5V. This list specifies 1.8V+ EEPROMs since those will work in the most situations
• The numbers in the end indicate kilobits (not KB!): '08 is 1 KB, '160 is 2 KB, '320 is 4 KB, '640 is 8 KB, '128 is 16 KB, '256 is 32KB, '512 is 64KB, etc.

Image	Part # & Datasheet	Description	Distributor	Eagle library part
	24x256 (i.e. 24LC256, etc)	256Kbit / 64KB i2c EEPROM 1.8V, 400 KHz	Mouser Digikey	microchip:24C* or 24LC*
	25x320 (i.e. 25LC320, CAT25320 or AT25320)	32 Kbit / 4 KB SPI EEPROM 1.8V 5MHz+	Digikey Mouser	microchip:25C*

• Notes on using the SN754410 v L293D: Some people use the SN754410 motor driver chip because it is pin-compatible, has output diodes and can provide 1A per motor, 2A peak. After careful reading of the datasheet and discussion with TI tech support and power engineers it appears that the output diodes were designed for ESD protection only and that using them as kickback-protection is a hack and not guaranteed for performance. For that reason Adafruit kits do not come with the SN754410 and instead use the L293D with integrated kickback-protection diodes. If you're willing to risk it, and need the extra currrent, feel free to buy SN754410s and replace the provided chips!
• Only the L293D(N), includes kickback diodes so you'll need 'em! You can use Schottky diodes such as 1N5818 (preferred) or 1N4001s

Image	Part # & Datasheet	Description	Distributor	Eaglie lib
	L293D or L293DN	2 H-bridges w/built-in diodes 0.6A per channel 4V-36V 1 stepper / 2 DC motors / 4 solenoids	Mouser Digikey Digikey Jameco Allied Arrow Avnet	st-microelectronics:L293D
	SN754410N	2 H-bridges w/ESD diodes 1 A per channel 4V-36V 1 stepper / 2 DC motors / 4 solenoids	Mouser Digikey	st-microelectronics:L293D
'multiwatt' package	L298N	2 H-bridges 2.5+ Amp per channel 4V-48V	Digikey Mouser	st-microelectronics:L298

Real time clocks!

Image	Part # and datasheet	Description	Distributor	Eagle lib.
	DS1307	Real time clock with battery backup	Mouser Digikey Maxim	Adafruit:DS1307
	Maxim DS3231	High precision real time clock with built in oscillator	Digikey Mouser Newark Maxim Direct
""	NXP PCF2129	Ditto, but only up to 4V	Digikey Mouser	microbuilder:pcf2129

These chips dont really exist anymore, but when they did it was AWESOME