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AMD (Xilinx) SN54LS377WB — Logic ICs

SN54LS377WB D-Type Flip-Flop, 40 MHz, 20-CFlatpack

MPNSN54LS377WB
End of Life

Texas Instruments SN54LS377WB, D-Type flip-flop, 8-bit, positive-edge triggered, non-inverted outputs, master reset, 40 MHz clock, 4.5 V to 5.5 V supply, -40°C to 125°C, 20-CFlatpack surface-mount package.

$12.0Ref. price · indicative, final on quote
AMD (Xilinx) SN54LS377WB datasheet (PDF)
Packaging20-CFlatpack
RoHSRoHS non-compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

SN54LS377WB specifications
ParameterValue
TypeD-Type
Output typeNon-Inverted
Trigger typePositive Edge
MountingSurface Mount
Voltage4.5V ~ 5.5V
Current - quiescent28 mA
Current - output high, low8mA, 400µA
Frequency40 MHz
Operating temperature-40°C ~ 125°C (TA)
PackageBulk
FunctionMaster Reset
Case20-CFlatpack
Number of elements1
Number of bits per element8
Max propagation delay @ v, max CL27ns @ 5V, 15pF

Product details

8-bit D-type register with master reset — military-grade bus latch

The SN54LS377WB is an 8-bit D-type flip-flop with master reset, positive-edge triggered, non-inverted outputs. Clock frequency is 40 MHz. Output high is 8 mA, output low is 400 µA.

Clock frequency is 40 MHz. Max propagation delay is 27 ns at 5 V and 15 pF. Quiescent current is 28 mA.

20-CFlatpack — hermetic surface-mount for harsh environments

The 20-CFlatpack is a ceramic, hermetic surface-mount package. Unlike plastic SOIC or TSSOP, the ceramic body resists moisture absorption and thermal shock, making it suitable for military avionics, satellite payloads, downhole tools, and other sealed or high-vibration assemblies. The flat leads require a reflow profile compatible with ceramic — typically a slower ramp rate than plastic packages to avoid thermal stress. Board layout should follow the supplier device package footprint for the 20-CFlatpack; lead pitch is standard for this form factor.

Frequently asked questions

What is the operating temperature range of SN54LS377WB?

The operating temperature range is -40°C to 125°C (TA). This is the military-grade temperature range, suitable for avionics, downhole, and other harsh-environment applications.

Is SN54LS377WB RoHS compliant?

No, the SN54LS377WB is RoHS non-compliant. This is typical for ceramic military-grade packages that use lead-based solder for hermetic seal integrity.

What is the pinout of SN54LS377WB?

The SN54LS377WB is an 8-bit D-type flip-flop in a 20-CFlatpack. Pin assignments follow the standard 54LS377 pinout: clock (pin 1), master reset (pin 13), data inputs D0–D7 (pins 3, 4, 7, 8, 13, 14, 17, 18), and non-inverted outputs Q0–Q7 (pins 2, 5, 6, 9, 12, 15, 16, 19). VCC is pin 20, GND is pin 10. Refer to the TI datasheet for the exact pin diagram.