NXP Semiconductors 74AHCT377D,112

Overview

74AHCT377D,112 from Nexperia is an octal positive-edge-triggered D-type flip-flop with data enable (active LOW), designed for synchronous data latching in digital logic systems. It operates at 4.5 V to 5.5 V supply voltage, delivers propagation delay as low as 4.0 ns (CL = 15 pF), supports maximum clock frequency up to 140 MHz, and functions across −40 °C to +125 °C - used in address register buffering and control-state capture in industrial microcontroller peripherals.

For engineers reviewing the 74AHCT377D,112 datasheet, 74AHCT377D,112 pinout, 74AHCT377D,112 application, or 74AHCT377D,112 equivalent, this page provides verified functional identity, SO20 package mapping, TTL-level input compatibility, timing parameters under 5 V operation, and direct alternatives for register-stage replacement in legacy LSTTL-compatible designs.

Technical Context

The 74AHCT377D,112 implements eight independent D-type flip-flops sharing a common clock (CP) and a single active-LOW data enable (E). All outputs update synchronously on the LOW-to-HIGH transition of CP when E is asserted, with setup/hold times of 4.5 ns / 2.0 ns respectively at VCC = 4.5–5.5 V.

Its TTL-compatible inputs accept 2.0 V minimum VIH and 0.8 V maximum VIL, enabling direct interfacing with 5 V LSTTL logic without level shifting. The device features Schmitt-trigger action on all inputs, balanced propagation delays between flip-flops, and ESD protection exceeding 2000 V HBM.

Key Specifications

Pinout & Package

74AHCT377D,112 is housed in a plastic small outline package (SO20) per SOT163-1, with 20 leads, 7.5 mm body width, and standard 1.27 mm lead pitch. Pin 1 is marked by a notch or dot; the package is RoHS-compliant and lead-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74AHCT374D,112, the 74AHCT377D,112 provides fixed-drive outputs ideal for static register banks, while SN74AHCT377N offers identical logic in through-hole form - both preserve the same 4.5–5.5 V operation, 140 MHz speed, and −40 °C to +125 °C range as the original.

Availability

74AHCT377D,112 is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, legacy microcontroller expansion, and test equipment design requiring stable component supply over extended temperature ranges and long production lifecycles.

Supply support for 74AHCT377D,112 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 high-volume, high-reliability logic, analog, and discrete components - spun off from NXP in 2017 and headquartered in Nijmegen, Netherlands.

The 74AHCT377D,112 belongs to Nexperia's 74AHCT logic family, engineered specifically for seamless migration from LSTTL in 5 V systems while delivering CMOS power efficiency and enhanced noise immunity.

FAQ

What is the supply voltage range for the 74AHCT377D,112?

The 74AHCT377D,112 operates strictly within 4.5 V to 5.5 V. Unlike its AHC counterpart, it is not rated for 2.0–5.5 V operation. Operation below 4.5 V may result in undefined input thresholds and unreliable output switching, as confirmed in Table 5 of the Nexperia datasheet Rev. 02.

Is the 74AHCT377D,112 pin-compatible with the 74AHC377D?

Yes, the 74AHCT377D,112 is pin-compatible with the 74AHC377D in the same SO20 package. Both share identical pinout, terminal functions, and physical dimensions per SOT163-1. However, their input voltage thresholds differ: 74AHCT377D,112 requires TTL-level inputs (VIH ≥ 2.0 V), whereas 74AHC377D accepts CMOS-level inputs (VIH ≥ 70% VCC).

Does the 74AHCT377D,112 support hot insertion or live insertion?

No, the 74AHCT377D,112 is not designed for hot insertion. Its absolute maximum ratings do not include powered-insertion stress conditions, and the absence of Ioff (power-off protection) or IOZ (high-impedance on power-down) features means back-driving outputs during insertion can exceed IOK limits (±20 mA) and cause damage.

What is the maximum clock frequency guaranteed across temperature for the 74AHCT377D,112?

The 74AHCT377D,112 guarantees a minimum clock frequency of 80 MHz across −40 °C to +125 °C when loaded with 50 pF (Table 7). At 25 °C and 15 pF load, typical performance reaches 140 MHz, but full-temperature compliance is specified at 80 MHz for robust design margins.

Can the 74AHCT377D,112 be used with a 3.3 V microcontroller interface?

No - the 74AHCT377D,112 requires a 4.5–5.5 V supply and has TTL-level inputs (VIH ≥ 2.0 V, VIL ≤ 0.8 V). A 3.3 V MCU cannot reliably drive its inputs high without external translation, and powering the 74AHCT377D,112 at 3.3 V violates its minimum supply specification and risks functional failure.