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Note that although some ICs have the same logic functions different types are available i.e.
These differences are because of the way the internal circuitry functions and or the spesific use of the chip, these different types are not always interchangeable even if the physical pin-outs being the same.
As a general rule the 74 TTL series chips :-
| 74???? |
|
| Pin outs & Notes |
|
| 7400 | 7400 |
 2-input
NAND gate |
Pin outs & Notes |
| 7400 | 74LS00 |
2-input
NAND gate |
Pin outs & Notes |
| 7400 | ALS,F,HC |
2-input
NAND gate |
Pin outs & Notes |
| 7401 | 7401 |
2 -input
NAND  |
Pin outs & Notes |
| 7402 | 7402 |
2-input
NOR gate |
Pin outs & Notes |
| 7402 | ALS,HC,F,HCT |
2-input
NOR gate |
Pin outs & Notes |
| 7403 | 7403 |
2-input
NAND gate |
Pin outs & Notes |
| 7403 | LS, S, HC, HCT |
2-input
NAND gate |
Pin outs & Notes |
| 7404 | 7404 |
 inverter |
Pin outs & Notes |
| 7404 | 74LS04 |
inverter |
Pin outs & Notes |
| 7404 | F,ALS,HC,HCT |
inverter |
Pin outs & Notes |
| 7405 | 7405 |
inverter
|
Pin outs & Notes |
| 7406 | 7406 |
inverter
30V 40ma |
Pin outs & Notes |
| 7407 | 7407 |
Buffer/line
driver |
Pin outs & Notes |
| 7407 | N74F07 |
Buffer/line
driver |
Pin outs & Notes |
| 7408 | 7408 |
2-input
AND gate |
Pin outs & Notes |
| 7408 | ALS,F,HCT |
2-input
AND gate |
Pin outs & Notes |
| 7409 | 7409 |
2-input
AND gate |
Pin outs & Notes |
| 7410 | 7410 |
 3-input
NAND gate |
Pin outs & Notes |
| 7410 | ALS,F,HC,HCT |
3-input
NAND gate |
Pin outs & Notes |
| 7411 | 7411 |
3-input
AND gate |
Pin outs & Notes |
| 7411 | ALS,F,HC,HCT |
3-input
AND gate |
Pin outs & Notes |
| 7412 | 7412 |
3 -input
NAND gate |
Pin outs & Notes |
| 7413 | 7413 |
 4-input
NAND Schmitt |
Pin outs & Notes |
| 7414 | 7414 |
Schmitt
trigger inverter |
Pin outs & Notes |
| 7415 | 7415 |
3-input
AND |
Pin outs & Notes |
| 7416 | 7416 |
inverter
15V 40ma |
Pin outs & Notes |
| 7418 | 7418 |
4-input
NAND Schmitt |
Pin outs & Notes |
| 7419 | 7419 |
inverter
Schmitt |
Pin outs & Notes |
| 7420 | 7420 |
4-input
NAND gate |
Pin outs & Notes |
| 7420 | ALS,HC,HCT,F |
4-input
NAND gate |
Pin outs & Notes |
| 7421 | 7421 |
4 -input
AND gate |
Pin outs & Notes |
| 7422 | 7422 |
4-input
NAND |
Pin outs & Notes |
| 7423 | 7423 |
4-input
exp NOR w/strobe |
Pin outs & Notes |
| 7424 | 7424 |
2-input
NAND Schmitt |
Pin outs & Notes |
| 7425 | 7425 |
4-input
NOR w/strobe |
Pin outs & Notes |
| 7426 | 7426 |
2-input
NAND 15V |
Pin outs & Notes |
| 7427 | 7427 |
3-input
NOR |
Pin outs & Notes |
| 7427 | 74LS27 |
3-input
NOR |
Pin outs & Notes |
| 7427 | ALS,HC,HCT,F |
3-input
NOR gate |
Pin outs & Notes |
| 7428 | 7428 |
2-input
NOR |
Pin outs & Notes |
| 7430 | 7430 | 8-input NAND gate | Pin outs & Notes |
| 7430 | ALS,F,HC,HCT | 8-input NAND gate | Pin outs & Notes |
| 7432 | 7432 |
2-input
OR gate |
Pin outs & Notes |
| 7432 | ALS,F,LS |
2-input
OR gate |
Pin outs & Notes |
| 7433 | 7433 |
2 NOR
48ma |
Pin outs & Notes |
| 7437 | 7437 |
2 NAND
48ma |
Pin outs & Notes |
| 7437 | N74F37 |
2-input
NAND buffer |
Pin outs & Notes |
| 7438 | 7438 |
2 2-input
NAND 48 mA |
Pin outs & Notes |
| 7438 | 74LS38 |
2-input
NAND buffer |
Pin outs & Notes |
| 7439 | 7439 |
2-input
NAND |
Pin outs & Notes |
| 7440 | 7440 |
4-input
NAND |
Pin outs & Notes |
| 7440 | N74F40 |
4-input
NAND |
Pin outs & Notes |
| 7442 | 7442 | 4 line to 10 line decoder | Pin outs & Notes |
| 7442 | 74LS42 | 4 line to 10 line decoder | Pin outs & Notes |
| 7445 | 7445 | BCD-to-Decimal decoder/driver | Pin outs & Notes |
| 7446 | 7446 |
BCD-to-7 segment decoder/driver |
Pin outs & Notes |
| 7447 | 7447 |
BCD-to-7 segment decoder/driver |
Pin outs & Notes |
| 7447 | 74LS47 |
BCD-to-7 segment decoder/driver |
Pin outs & Notes |
| 7448 | 7448 | BCD-to-7 segment decoder/driver | Pin outs & Notes |
| 7448 | 74LS48 | BCD-to-7 segment decoder/driver | Pin outs & Notes |
| 7449 | 7449 |
BCD-to-7 segment decoder/driver |
Pin outs & Notes |
| 7450 | 7450 |
2-2 exp
 |
Pin outs & Notes |
| 7450 | 74H50 |
2-2 exp
|
Pin outs & Notes |
| 7451 | 7451 |
2-2 + 3-3 |
Pin outs & Notes |
| 7452 | 7452 | 3-2-2-2 exp AO | Pin outs & Notes |
| 7453 | 7453 |
2-2-2-2 exp |
Pin outs & Notes |
| 7453 | 74H53 |
3-2-2-2 exp |
Pin outs & Notes |
| 7454 | 7454 |
2-2-2-2 |
Pin outs & Notes |
| 7455 | 74LS55 |
4-4 |
Pin outs & Notes |
| 7458 | 7458 |
AND-OR
gate |
Pin outs & Notes |
| 7460 | 7460 |
4 expander
(for 7423, 7450, 7453, 7455) |
Pin outs & Notes |
| 7461 | 7461 |
3 expander
(for 7452) |
Pin outs & Notes |
| 7462 | 7462 | 3-3-2-2 AO expander (for 7450, 7453, 7455) | Pin outs & Notes |
| 7464 | 74S64 |
4-3-2-2 |
Pin outs & Notes |
| 7465 | 74S65 |
4-3-2-2 |
Pin outs & Notes |
| 7470 | 7470 | AND gated J-K Flip-Flop. | Pin outs & Notes |
| 7472 | 7472 | AND gated J-K Flip-Flop.(Mastre/Slave) | Pin outs & Notes |
| 7473 | 7473(A) |
J-K Flip-Flop.
Pulse triggered (73A -ve triggered) |
Pin outs & Notes |
| 7474 | 7474 |
D-Type
Flip-Flop.+ve edge trig. |
Pin outs & Notes |
| 7474 | 74LS74 |
D-Type
Flip-Flop.+ve edge trig. |
Pin outs & Notes |
| 7475 | 7475 | 4-Bit Bi-stable latch | Pin outs & Notes |
| 7475 | LS,S | 4-Bit Bi-stable latch | Pin outs & Notes |
| 7476 | 7476 |
J-K Flip-Flop.+ve
edge trig. |
Pin outs & Notes |
| 7476 | 74LS76(A) |
J-K Flip-Flop.+ve
edge trig. |
Pin outs & Notes |
| 7480 | 7480 | 1-bit gated adder | Pin outs & Notes |
| 7482 | 7482 | 2-bit adder | Pin outs & Notes |
| 7483 | 74LS83 | 4-bit adder 24ns | Pin outs & Notes |
| 7485 | 7485 | 4-bit Magnitude Comparator | Pin outs & Notes |
| 7485 | 74LS85 | 4-bit Magnitude Comparator | Pin outs & Notes |
| 7486 | 7486,ALS,F, |
2-input
XOR gate |
Pin outs & Notes |
| 7486 | 74LS86 |
2-input
XOR gate |
Pin outs & Notes |
| 7490 | 7490A | Decade counter | Pin outs & Notes |
| 7490 | 74LS90 | Decade counter | Pin outs & Notes |
| 7491 | 7491 | 8-Bit Shift Register | Pin outs & Notes |
| 7491 | 74LS91 | 8-Bit Shift Register | Pin outs & Notes |
| 7492 | 7492A | Divide by 12 counter | Pin outs & Notes |
| 7492 | 74LS92A | Divide by 12 counter | Pin outs & Notes |
| 7493 | 7493A | 4-Bit Binary counter | Pin outs & Notes |
| 7493 | 74LS93 | 4-Bit Binary counter | Pin outs & Notes |
| 7495 | 7495A | 4-Bit Parallel-Access shift register | Pin outs & Notes |
| 7495 | 74LS95A | 4-Bit Parallel-Access shift register | Pin outs & Notes |
| 7496 | 7496 | 5-Bit shift register | Pin outs & Notes |
| 7496 | 74LS96 | 5-Bit shift register | Pin outs & Notes |
| 7497 | 7497 | Synchronous 6-Bit Binary rate multipliers | Pin outs & Notes |
| 74100 | 74100 |
4-Bit latch |
Pin outs & Notes |
| 74107 | 74107 |
J-K Flip-Flop. |
Pin outs & Notes |
| 74107 | 74LS107 |
J-K Flip-Flop. |
Pin outs & Notes |
| 74109 | 74109 |
J-K Flip-Flop
+ve edge, Pr. & clear |
Pin outs & Notes |
| 74109 | 74LS109 |
J-K Flip-Flop
+ve edge, Pr. & clear |
Pin outs & Notes |
| 74111 | 74111 |
J-K Flip-Flop
Master-Slave. |
Pin outs & Notes |
| 74111 | 74LS111 |
J-K Flip-Flop
Master-Slave. |
Pin outs & Notes |
| 74112 | 74LS112 |
J-K Flip-Flop
-ve edge, Pr. & clear |
Pin outs & Notes |
| 74112 | 74S112 |
J-K Flip-Flop
-ve edge, Pr. & clear |
Pin outs & Notes |
| 74113 | 74LS113 |
J-K Flip-Flop
-ve edge, Preset |
Pin outs & Notes |
| 74113 | 74S113 |
J-K Flip-Flop
-ve edge, Preset |
Pin outs & Notes |
| 74114 | 74S114 |
J-K Flip-Flop
-ve edge, Preset, common clear/clock |
Pin outs & Notes |
| 74120 | 74120 |
pulse synchronizer |
Pin outs & Notes |
| 74121 | 74121 | Monostable-multivibrator with Schmitt trig. | Pin outs & Notes |
| 74122 | 74122 | retrig one-shot w/clear | Pin outs & Notes |
| 74122 | 74LS122 | retrig one-shot w/clear | Pin outs & Notes |
| 74123 | 74123 | Re-triggerable Monostable-multivibrator | Pin outs & Notes |
| 74123 | 74LS123 | Re-triggerable Monostable-multivibrator | Pin outs & Notes |
| 74124 | 74S122 |
Voltage-controlled
oscillator |
Pin outs & Notes |
| 74126 | 74126 |
Bus buffers
with 
outputs |
Pin outs & Notes |
| 74128 | 74128 |
2 NOR
50 ohm line driver |
Pin outs & Notes |
| 74130 | 74130 | --- | Pin outs & Notes |
| 74132 | 74132 |
2-input
NAND Schmitt trigger |
Pin outs & Notes |
| 74132 | 74LS132 |
2-input
NAND Schmitt trigger |
Pin outs & Notes |
| 74133 | 74S133 | 13-input NAND gate | Pin outs & Notes |
| 74134 | 74S134 |
12-input NAND |
Pin outs & Notes |
| 74135 | 74S135 |
2 XOR/XNOR |
Pin outs & Notes |
| 74136 | 74136 |
2 XOR
|
Pin outs & Notes |
| 74137 | 74LS137 | 3-line to 8-line decoders/multiplexers | Pin outs & Notes |
| 74138 | 74LS138 | 3-line to 8-line decoders/multiplexers | Pin outs & Notes |
| 74138 | 74S138 | 3-line to 8-line decoders/multiplexers | Pin outs & Notes |
| 74139 | 74LS139 |
2-line to
4-line decoders/multiplexers |
Pin outs & Notes |
| 74139 | 74S139 |
2-line to
4-line decoders/multiplexers |
Pin outs & Notes |
| 74140 | 74S140 |
4 I/P +ve
NAND 50 ohm driver |
Pin outs & Notes |
| 74143 | 74143 | 4-Bit Counter/latch 7 Segment LED/Lamp driver | Pin outs & Notes |
| 74145 | 74145 | BCD-to-Decimal decoders/drivers | Pin outs & Notes |
| 74148 | 74148 | 10-line to 4-line & 8-line to 3-line priority encoders | Pin outs & Notes |
| 74148 | 74LS148 | 10-line to 4-line & 8-line to 3-line priority encoders | Pin outs & Notes |
| 74153 | 74153 |
4-1 multiplexer |
Pin outs & Notes |
| 74154 | 74154 | 4-line to 16-line decoders/demultiplexers | Pin outs & Notes |
| 74154 | 74LS154 | 4-line to 16-line decoders/demultiplexers | Pin outs & Notes |
| 74157 | 74157/8 |
2-line
to 1-line data selectors/multiplexers |
Pin outs & Notes |
| 74157 | 74LS157/8 |
2-line
to 1-line data selectors/multiplexers |
Pin outs & Notes |
| 74159 | 74159 |
4-line to 16-line decoders/demultiplexers |
Pin outs & Notes |
| 74160-163 | 74LS160,1,2&3 | Various Synchronous Presettable 4-Bit Binary Counters | Pin outs & Notes |
| 74164 | 74164 | 8-Bit Parallel-Out serial shift registers | Pin outs & Notes |
| 74164 | 74LS164 | 8-Bit Parallel-Out serial shift registers | Pin outs & Notes |
| 74165-173 | |||
| 74174 | 74LS174 |
D-Type flip-flops
with clear |
Pin outs & Notes |
| 74175 | 74LS175 |
D-Type
flip-flops with clear |
Pin outs & Notes |
| 74176-180 | 74176-180 | Pin outs & Notes | |
| 74181 | 74LS181 | Arithmetic Logic units/Functions Generators | Pin outs & Notes |
| 74182 | 74182 | look ahead carry generator | Pin outs & Notes |
| 74182 | F,HC,HCT | Look-ahead carry generator | Pin outs & Notes |
| 74183 | 74183 |
carry save
adder |
Pin outs & Notes |
| 74190/1 | 74LS190/1 | Presettable Synchronous 4-Bit Binary Counters | Pin outs & Notes |
| 74192/3 | 74LS192/3 | Presettable Synchronous 4-Bit Binary Counters with clear | Pin outs & Notes |
| 74194 | 74LS194 | 4-Bit Bidirectional universal shift registar | Pin outs & Notes |
| 74195 | 74 LS195 | 4-Bit Parallel-Access shift Registers | Pin outs & Notes |
| 74196/7 | 74196/7 | 50MHz presettable Decade or Binary counter/latches | Pin outs & Notes |
| 74198/9 | 74198/9 | 8-Bit shift Registers | Pin outs & Notes |
| 74221 | 74LS221 |
precision
one-shot Multivibrator Schmitt trigger i/ps |
Pin outs & Notes |
| 74231 | 74AS231 |
4-bit
inverter |
Pin outs & Notes |
| 74238 | 74238 | 1 of 8 Decoders | Pin outs & Notes |
| 74240-1 | 74LS240-1 |
 Buffer
and line driver with
output |
Pin outs & Notes |
| 74242-3 | 74LS242-3 |
Bus Transceivers |
Pin outs & Notes |
| 74244 | 74LS244 |
Buffer
and line driver with
output |
Pin outs & Notes |
| 74245 | 74LS245 |
Buffer
and line driver with
output |
Pin outs & Notes |
| 74247 | 74LS247 | BCD-to-7 segment Decoders/Drivers | Pin outs & Notes |
| 74251 | 74LS251 |
Data Selectors/Multiplexers with
output |
Pin outs & Notes |
| 74253 | 74LS253 |
4-line to
1-line Sel./Multiplexer with
output |
Pin outs & Notes |
| 74257 | 74LS257 |
2-line
to 1-line Selectors/Multiplexers |
Pin outs & Notes |
| 74258 | 74LS258 |
2-line
to 1-line Selectors/Multiplexers |
Pin outs & Notes |
| 74258 | 74LS258B |
as above
but 3 times current sink capability |
Pin outs & Notes |
| 74259 | 74LS259 | 8-Bit Addressable latches | Pin outs & Notes |
| 74259 | 74LS259B | 8-Bit Addressable latches | Pin outs & Notes |
| 74260 | 74LS260 |
5-input
NOR gate |
Pin outs & Notes |
| 74261 | 74LS261 | 2-Bit by 4-Bit Parallel Binary Multiplexers | Pin outs & Notes |
| 74265 | 74265 |
complementary
output elements |
Pin outs & Notes |
| 74266 | 74LS266 |
2-Input
XNOR 30ns |
Pin outs & Notes |
| 74273 | 74273 |
D-type
Flip-Flop with Clear |
Pin outs & Notes |
| 74273 | 74LS273 |
D-type
Flip-Flop with Clear |
Pin outs & Notes |
| 74276 | 74276 |
J-K Flip-Flop |
Pin outs & Notes |
| 74278 | 74278 | 4-Bit Cascadable Priority Registers | Pin outs & Notes |
| 74279 | 74279 |
S-R latch |
Pin outs & Notes |
| 74279 | 74LS279 |
S-R latch |
Pin outs & Notes |
| 74280 | 74280 | 9-bit parity generator/checker | Pin outs & Notes |
| 74282 | 74282 | look ahead carry generator | Pin outs & Notes |
| 74283 | 74283 | 4-bit binary full adder with fast carry | Pin outs & Notes |
| 74283 | F,LS,S | 4-bit binary full adder with fast carry | Pin outs & Notes |
| 74285 | 74285 | 4-Bit by 4-Bit Parallel Binary Multipliers | Pin outs & Notes |
| 74290 | 74290 | Decade Counter | Pin outs & Notes |
| 74290 | 74LS290 | Decade Counter | Pin outs & Notes |
| 74293 | 74293 | 4-Bit Binary Counter | Pin outs & Notes |
| 74293 | 74LS293 | 4-Bit Binary Counter | Pin outs & Notes |
| 74292/4 | 74292/4 | Programmable Freqency Divider/Digital Timer | Pin outs & Notes |
| 74292/4 | 74LS292/4 | Programmable Freqency Divider/Digital Timer | Pin outs & Notes |
| 74295 | 74LS295B |
4-Bit Right-Shift Left -Shift
output |
Pin outs & Notes |
| 74297 | 74LS297 | Digital Phase-Locked-Loop Filters | Pin outs & Notes |
| 74298 | 74298 |
2-Input
Multiplexers with Storage |
Pin outs & Notes |
| 74299 | 74LS299 | 8-Bit Universal Shift Register | Pin outs & Notes |
| 74320/1 | 74LS320/1 | Cystal-Controlled Oscillators 1MHz-20MHz | Pin outs & Notes |
| 74322 | 74LS322 | 8-Bit Shift Registers with Sign Extend | Pin outs & Notes |
| 74323 | 74LS323 | 8-Bit Universal Shift/Storage Registers | Pin outs & Notes |
| 74340 | 74S340 |
4-bit inverter
|
Pin outs & Notes |
| 74348 | 74LS348 |
8-Line to 3-Line Priority Encoders
output |
Pin outs & Notes |
| 74352 | 74LS352 |
4-line to
1-line data selectors/multiplexers |
Pin outs & Notes |
| 74353 | 74LS353 |
4-line to
1-line data sel../multiplexers
output |
Pin outs & Notes |
| 74355/6 | 74LS355/6 | 8-line to 1-line data sel../multiplexers/Registers | Pin outs & Notes |
| 74365/7 | 74365/7 |
Bus Drivers
with
output |
Pin outs & Notes |
| 74366/8 | 74366/8 |
Bus Drivers
with
output Inverted O/P |
Pin outs & Notes |
| 74373 | 74LS373 |
D-Type
Transparent Latchs
output |
Pin outs & Notes |
| 74374 | 74LS374 |
Edge
Triggered Flip-Flops
output |
Pin outs & Notes |
| 74375 | 74LS375 | 4-Bit Bistable Latches | Pin outs & Notes |
| 74376 | 74376 |
J-K Flip-Flops |
Pin outs & Notes |
| 74377 | 74LS377 |
D-Type
Flip-Flops Single-rail Outputs with Enable |
Pin outs & Notes |
| 74378 | 74LS378 |
D-Type
Flip-Flops Single-rail Outputs with Enable |
Pin outs & Notes |
| 74379 | 74LS377 |
D-Type
Flip-Flops Double-rail Outputs with Enable |
Pin outs & Notes |
| 74381/2 | 74LS381/2 | 4-Bit arithmetic logic unit | Pin outs & Notes |
| 74384 | 74LS384 | 8-Bit by 1-Bit Two's-Complement Multipliers | Pin outs & Notes |
| 74385 | 74LS385 |
serial
adder/subtractor |
Pin outs & Notes |
| 74386 | 74LS386A |
2 XOR
Gates |
Pin outs & Notes |
| 74390 | 74LS390 |
Version
of the 7490 Gates |
Pin outs & Notes |
| 74393 | 74LS393 |
Version
of the 7493 Gates |
Pin outs & Notes |
| 74395 | 74LS395A |
8-Bit Cascadable Shift Registers
output |
Pin outs & Notes |
| 74396 | 74LS396 |
Storage
Registers |
Pin outs & Notes |
| 74399 | 74LS399 |
2-Input
Multiplexers with Storage |
Pin outs & Notes |
| 74422 | 74422 | Retriggerable Monostable Multivibrator | Pin outs & Notes* |
| 74423 | 74423 |
Retriggerable
Monostable Multivibrators |
Pin outs & Notes* |
| 74440-4 | 74LS440-4 |
Tri-directional
Bus Transceivers |
Pin outs & Notes |
| 74445 | 74LS445 | BCD-to-Decimal (Low Voltage versions on 74145) | Pin outs & Notes |
| 74446/9 | 74LS446/9 |
Bus Transcievers
with individual Direction controls |
Pin outs & Notes |
| 74465/7 | 74LS465/7 |
Buffers
|
Pin outs & Notes |
| 74466/8 | 74LS466/8 |
Buffers
Inverting |
Pin outs & Notes |
| 74490 | 74LS490 |
4-Bit Decade
counters (Dual version of 7490) |
Pin outs & Notes |
| 74540 | 74540 |
8-bit
flow-through invertering |
Pin outs & Notes |
| 74541 | 74541 |
8-bit
flow-through |
Pin outs & Notes |
| 74590 | 74LS590 |
8-bit Binary Counters with Output Registers |
Pin outs & Notes |
| 74591 | 74LS591 |
8-bit Binary Counters with Output Registers |
Pin outs & Notes |
| 74616 | 74616 |
16-bit |
Pin outs & Notes |
| 74617 | 74617 |
16-bit |
Pin outs & Notes |
| 74618 | 74618 |
4 NAND
Schmitt |
Pin outs & Notes |
| 74624 | N74F624 | 4-2-3-2-input AND-OR-invert gate | Pin outs & Notes |
| 74640 | 74640 | Inverting Transceiver | Pin outs & Notes |
| 74655 | 74F655 |
8-bit inverter + parity gen |
Pin outs & Notes |
