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WANT MORE?? Dont forget to see everything else in the Part selector index!


General notes:

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

Where else to find chips

Hopefully we (and other nice people) will be able to keep the distributor links current. But if we cant you can always search at or 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.

Power Supply

Please see vreg for regulators & other power converters

Op amps!

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.
ts922_t.jpg 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.
tlc551_t.jpg 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
74hc595_t.jpg 74HC595N 8-bit serial-to-parallel latch
Can be cascaded for controlling dozens of digital outputs
Mouser Digikey
74hc595_t.jpg TPIC6C596N Just like the 74'595 but is the current sinking version of the 74HC595
Specifically for driving lots of LEDs
Mouser Digikey
74hc595_t.jpg 74HC165N 8-bit parallel-to-serial latch
Can be cascaded for reading dozens of digital inputs
Digikey Mouser
74hc595_t.jpg 74AHC125N Tri-stateable buffer, 5V compliant
We use these for logic level shifting 5v → 3v
Mouser 74xx:74*125
74hc595_t.jpg 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
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
24lc256_t.jpg 24x256 (i.e. 24LC256, etc) 256Kbit / 64KB i2c EEPROM
1.8V, 400 KHz
Mouser Digikey microchip:24C* or 24LC*
eeprom_t.jpg 25x320 (i.e. 25LC320, CAT25320 or AT25320) 32 Kbit / 4 KB SPI EEPROM
1.8V 5MHz+
Digikey Mouser microchip:25C*

Motor control

  • 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
74hc595_t.jpg 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
74hc595_t.jpg 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

LED / Display drives

Image Part # & Datasheet Description Distributor Eaglie lib
LM3914N (DIP) Analog input 10-LED driver Digikey Mouser


Real time clocks!

Image Part # and datasheet Description Distributor Eagle lib.
ds1307_t.jpg 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

I/O Expanders and MUXes

Image Part # and datasheet Description Distributor Eagle lib.
PCA9685 16-bit Free-running PWM Driver
I2C control
Digikey Adafruit:PCA9685
MCP23008 8-bit input/output with pull-ups and interrupt support Digikey Mouser Adafruit:MCP23008
74HCT4067 16:1 analog multiplexer w/60 ohm resistance Digikey Mouser 40xx:4067
74HC4051 8:1 analog multiplexer Digikey Mouser 40xx:4051
74HC4052 Dual 4:1 analog mulitplexer Digikey Mouser 40xx:4052

Mystical (Obsolete)

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

Image Part # and datasheet Description Distributor
20-dip ICL8038 and MAX038 "The MAX038 is (was) a high-frequency, precision function generator producing accurate, high-frequency triangle, sawtooth, sine, square, and pulse waveforms with a minimum of external components. The output frequency can be controlled over a frequency range of 0.1Hz to 20MHz No longer made
28-dip SN76477 "The SN76477 'complex sound generator' was a sound chip produced by Texas Instruments (TI). The chip came to market in 1978, and TI production of the part ceased some time ago. More recently, a 100% compatible version, identified as ICS76477, has been listed as 'in stock' by at least one US-based component stockist. The chip was typically used as a sound effects generator in arcade games & toys and for hobby projects." No longer made
/home/ladyada/public_html/wiki/data/pages/partfinder/ic.txt · Last modified: 2016/01/28 18:05 (external edit)