To make a long story short: use the MAX6921 for your VFD project. Serial input, 20 outputs (can be cascaded for more outputs), max 76V and only €2.36 on Ali. For the filament I used a TC4425, which may be a strange choice since it is intended for driving MOSFETs, but hey, it’s 8 pin DIP, has one normal and one inverted output and it does the business. Super!

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I needed a few drivers for a project with a Vacuum Fluorescent display (VFD) with 13 digits and 9 segments. It needed 25V and I needed another one for the filament. Ashrae psychrometric software free download. I didn’t want to make it from discrete transistors, the prospect of having 22 transistors and associated resistors did not appeal to me. And I wanted to connect it to a microcontroller using a serial protocol, preferably SPI. Abcd same game.

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So I started browsing the internet for suitable ICs. I soon found out that most driver ICs that can withstand 25V or more have NPN open collector outputs. And that makes them unusable for a VFD, because the VFD digit and segment connections all sink current, so they need a driver that can source current. And NPN open collector outputs just can’t do that! License for microwind 3.5. PNP open collector ouputs don’t seem to exist, you can only build them yourself from discrete components.

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I ended up using the MAX6921, which is especially intended for driving VFD displays, has SPI input (good!), goes up to 76V (good) and has 20 outputs (just 2 short of the 22 I need). It’s €2.36 on Aliexpress. It can be cascaded, so two make 40 outputs (which is 18 too many). It comes from a whole family of ICs (MAX6920-6934) but only the MAX6921 seems to be currently (2017) available.

In my queste I found a whole bunch of driver ICs, so I decided to make an overview. I use the following definition. A driver IC is an IC that transforms signals from a digital circuit at digital level (5V or less) to a higher current and/or voltage so it can drive a display (incandescent/LED/VFD/Nixie/etc), a motor, a solenoid, etc.

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So here is the overview. The price is in Euro per piece (if you buy 10 of them).

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TypePricefromInputOutput type# portsUmax Max Output Voltage (V)Source Current (mA)Sink Current (mA)Remarks
UDN61180,66Aliexpressparallelpush885250,5VFD
SN754681,06Conradparallelopen collector71000500pin compat ULN2003
ULN20030,07Aliexpressparallelopen collector7500500
ULN28030,10Aliexpressparallelopen collector8500500
SN75480 DS88802,25eBaybcd parallelopen collector712001,57 segment decoder full hex; programmable current, for gas-filled displays
L293D0,24Aliexpressparallelpush pull436600600
SN7544100,50Aliexpressparallelpush pull43610001000pin compat L293D, more current, peak current 2amp
MAX69212,36AliexpressSPIpush pull2076404VFD, SMD
SN74LS2470,41Aliexpressbcd parallelopen collector7150247 segment decoder
SN74LS2481,10Aliexpressbcd parallelpull up resistor760,167 segment decoder
SN74LS249bcd parallelopen collector76087 segment decoder
SN74LS47bcd parallelopen collector7150247 segment decoder with tailless 6 and 9
ICM7218C1,80Aliexpressbcd parallelopen collector1560407 segment decoder by 8 digits multiplexed common anode display
ICM7218Bbcd parallel1562007 segment decoder by 8 digits multiplexed common cathode display
MC145110,35Futurlecparallelpush7180107 segment decoder with tailless 6 and 9
MC144951,00Aliexpressparallelopen collector81801,25hex to 7 segment common cathode LED driver
MC144892,35Aliexpressserialpush136007 segment decoder by 5 digits multiplexed common cathode display
MC144991,00Aliexpressserialpush127007 segment decoder by 4 digits multiplexed common cathode display
DM93707,00ebaybcd parallelopen collector7503,27 segment common anode
DM93748,50ebaybcd parallelopen collector7100187 segment common anode
OL72726,17eBayparalleltri state430100100differential outputs
UDN29810,57Aliexpressparallelpush8503500or MIC2981
UDN29820,81Aliexpressparallelpush8503500or A2982, MIC2982
MMH00260,31Aliexpressparallel00pin compat with TC426
DS00260,45Aliexpressparallel00pin compat with TC426
TC4260,14Aliexpressparallelpush pull215001500peak current; 2x inverting; mosfet driver
TC44260,23Aliexpressparallelpush pull200
TC427parallelpush pull215001500peak current; 2x noniverting; mosfet driver
TC428parallelpush pull215001500peak current; 1 inverting, 1 noninverting; mosfet driver
TC4423parallelpush pull21830003000peak current; 2x inverting; mosfet driver
TC4424parallelpush pull21830003000peak current; 2x noninverting; mosfet driver
TC44253,00Conradparallelpush pull21830003000peak current; 1 inverting, 1 noninverting; mosfet driver
L91100,22Aliexpressparallelpush pull212800800peak 1500mA; motor driver; eq HG7881; hi-low transition is slow: 30ms
74HC5950,05Aliexpressserial863535TTL shift register
74LS59611,00eBayserialopen collector85024open collector version of HC595
TPIC65954,45eBayserialopen drain8450250power version of 74HC595 not pin compatible
TPIC6B5950,29Aliexpressserialopen drain8500150power version of 74HC595 not pin compatible
TLC59250,62Aliexpressserialcurrent sink1617045LED driver constant current common anode
SN741411,30Aliexpressbcd parallelopen collector106007Nixie driver
K155ID11,34eBaybcd parallelopen collector106000Russian equivalent of SN74141
HEF4000 series1800
CD401094,80eBaypush pull4186,86,8level shifter
HCF40941,00eBayserialpush pull8156,86,88 stage shift and store register
HEF40940,20Aliexpressserialpush pull8153,43,48 stage shift and store register
M6600427,00Aliexpressserial524000,5VFD controller IC, 16 digit 7×5 segment
LC75710, 11, 121,00eBayserial545000VFD controller IC, 16 digit 7×5 segment
HA120103,70eBayanalog122400VFD bar graph driver
LM90221,03Aliexpresspush pull25430430VFD filament driver 2W