Nexperia USA Inc. 74AHCT377D,118

Overview

74AHCT377D,118 from Nexperia is an octal positive-edge-triggered D-type flip-flop with individual D inputs and Q outputs, a shared clock (CP), and active-low data enable (E). It operates at 4.5 V to 5.5 V, delivers propagation delay as low as 4.0 ns (CL = 15 pF), supports −40 °C to +125 °C ambient range, and is pin-compatible with LSTTL logic. It serves as an addressable register in microcontroller I/O expansion and synchronous data latching circuits.

For engineers reviewing the 74AHCT377D,118 datasheet, 74AHCT377D,118 pinout, 74AHCT377D,118 application, or 74AHCT377D,118 equivalent, key selection criteria include TTL-level input compatibility, 8-bit edge-triggered storage with enable control, SO20 package thermal performance, and guaranteed setup/hold timing (tsu = 4.5 ns, th = 2.0 ns) under industrial temperature conditions.

Technical Context

This device implements eight independent D-type flip-flops sharing one clock and one global enable signal. Each flip-flop captures the state of its D input on the LOW-to-HIGH transition of CP, provided E is LOW and stable one setup time prior - enabling synchronized parallel loading of 8-bit data streams.

Input thresholds are TTL-compatible (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V), output drive capability reaches ±8 mA, and all inputs feature Schmitt-trigger action for noise immunity. The design supports reliable operation across full industrial and extended automotive temperature ranges without derating below 125 °C.

Key Specifications

Pinout & Package

74AHCT377D,118 is housed in a plastic small outline package (SO20, SOT163-1) with 20 leads and 7.5 mm body width, rated for surface-mount reflow and compatible with standard SOIC footprints.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal D-type flip-flop applications.

Compared with SN74AHCT377N and 74LVC377PW, the 74AHCT377D,118 uniquely combines 5 V TTL compatibility, SO20 thermal reliability, and Schmitt-trigger noise immunity - making it the optimal choice for industrial control upgrades requiring drop-in replacement of legacy 74LS377 while maintaining signal integrity across noisy environments.

Availability

74AHCT377D,118 is available at Aetrix Electronics and suitable for microcontroller I/O expansion, industrial bus interface, address register for memory mapping, and high-speed data capture buffer applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74AHCT377D,118 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Nexperia is a global semiconductor expert focused on essential efficiency technologies, delivering high-performance logic, discrete, and MOSFET solutions optimized for reliability and energy efficiency in industrial, automotive, and consumer applications.

The 74AHCT series targets robust 5 V digital interfacing, bridging legacy TTL systems with modern CMOS design practices - specifically engineered for noise-immune, temperature-stable operation in harsh electromagnetic environments.

FAQ

What is the maximum clock frequency supported by the 74AHCT377D,118?

The 74AHCT377D,118 supports up to 110 MHz maximum frequency at VCC = 5.0 V with CL = 15 pF load, and 75 MHz at CL = 50 pF. This is derived from measured propagation delay (tpd = 4.0 ns typ, 11.5 ns max) and pulse width (tW ≥ 5.0 ns) specifications under recommended operating conditions. Frequency degrades predictably with increased capacitive loading or reduced supply voltage.

Does the 74AHCT377D,118 require external pull-up or pull-down resistors on its inputs?

No external pull-up or pull-down resistors are required on E or CP inputs because all inputs feature integrated Schmitt-trigger action, providing hysteresis that ensures clean switching even with slow or noisy signals. However, unused D inputs should be tied to VCC or GND to prevent floating states and minimize ICC current - especially critical in low-power or thermally constrained designs.

Can the 74AHCT377D,118 operate reliably at 3.3 V supply?

No - the 74AHCT377D,118 is specified only for 4.5 V to 5.5 V operation. At 3.3 V, VIH (2.0 V min) and VOL (≤0.55 V max) margins collapse, and propagation delay increases beyond specification. For 3.3 V systems, use the pin-compatible 74LVC377 instead, which is characterized for 1.65–3.6 V and provides LVCMOS input thresholds.

How does the data enable (E) input affect timing behavior during clock transitions?

When E is HIGH, the 74AHCT377D,118 holds all Q outputs regardless of CP transitions - no state change occurs. When E is LOW, the device requires E to be stable for at least 4.5 ns before the LOW-to-HIGH CP edge (tsu) to guarantee predictable D-to-Q transfer. Violating this setup time may result in metastable or indeterminate outputs, as confirmed in the function table and timing diagrams of the official Nexperia datasheet.