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Texas Instruments SN74HC688N — Analog & Data Acquisition

SN74HC688N Texas Instruments 74HC Identity Comparator, 8-bit

MPNSN74HC688N
End of Life

Texas Instruments 74HC series SN74HC688N 8-bit identity comparator, active-low output, through-hole 20-DIP (0.300", 7.62mm), 2V~6V supply, -40°C~85°C.

$1.54Ref. price · indicative, final on quote
Texas Instruments SN74HC688N datasheet (PDF)
Packaging20-DIP (0.300", 7.62mm)
RoHSROHS3 Compliant
Series74HC
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

SN74HC688N specifications
ParameterValue
TypeIdentity Comparator
Series74HC
MountingThrough Hole
Supply voltage2V ~ 6V
Current - quiescent8 µA
Current - output high, low5.2mA, 5.2mA
Operating temperature-40°C ~ 85°C
OutputActive Low
PackageTube
Number of bits8
Case20-DIP (0.300\", 7.62mm)
Output functionA=B
Max propagation delay @ v, max CL36ns @ 6V, 50pF

Product details

8-bit identity comparison in a through-hole DIP

The Texas Instruments SN74HC688N is an 8-bit identity comparator from the 74HC family, comparing two 8-bit words and asserting an active-low output when they match. The 8 µA quiescent current keeps the static power draw negligible in always-on monitoring circuits.

Parametric fit for timing and temperature

For a 5 V system driving a 50 pF bus, the output settles within 36 ns, so the downstream latch must wait at least that long before reading the result.

Frequently asked questions

What is the SN74HC688N used for?

It is an 8-bit identity comparator: it compares two 8-bit words and pulls its output low when they match. Typical uses include address decoding in memory-mapped I/O systems, data-bus monitoring, and fault-detection circuits where a specific binary pattern triggers an alert.