Nexperia USA Inc. 74AHCT273PW,118

Overview

74AHCT273PW,118 from Nexperia is an octal positive-edge-triggered D-type flip-flop with asynchronous master reset (MR), designed for synchronous data latching in digital logic systems. It operates from 4.5 V to 5.5 V, delivers propagation delays as low as 4.0 ns (CL = 15 pF), supports -40 °C to +125 °C ambient operation, and features TTL-compatible inputs for seamless integration with legacy 5 V logic families. It is commonly used in address/data register buffering and clock-synchronized I/O expansion.

For engineers reviewing the 74AHCT273PW,118 datasheet, 74AHCT273PW,118 pinout, 74AHCT273PW,118 application, or 74AHCT273PW,118 equivalent, this device is selected for high-speed, single-clock-cycle data capture in industrial control registers, microcontroller peripheral interfacing, and bus-hold latch circuits where deterministic timing and robust reset behavior are required.

Technical Context

This device implements eight independent D-type flip-flops sharing a common clock (CP) and active-low master reset (MR). Each flip-flop samples its D input on the LOW-to-HIGH transition of CP and holds the state until the next valid edge or MR assertion. The MR input forces all Q outputs LOW independently of CP or D, enabling system-wide initialization without clock dependency.

Input thresholds are TTL-compatible (VIH ≥ 2.0 V, VIL ≤ 0.8 V at VCC = 4.5–5.5 V), ensuring reliable interfacing with standard 5 V logic. Overvoltage-tolerant inputs (up to 5.5 V) allow safe use in mixed-voltage domains, while Schmitt-trigger action on all inputs improves noise immunity against slow or noisy signal edges.

Key Specifications

Pinout & Package

TSSOP20 package (SOT360-1): 20-pin thin shrink small outline, 4.4 mm body width, 0.65 mm pitch, lead-free and RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74AHC273PW,118 and SN74ACT273PWR, the 74AHCT273PW,118 uniquely balances TTL-level interoperability, industrial-grade temperature resilience, and sub-5 ns propagation delay - making it optimal for cost-sensitive, high-volume industrial control designs where legacy logic compatibility is non-negotiable.

Availability

74AHCT273PW,118 is available at Aetrix Electronics and suitable for industrial automation, programmable logic controllers, and embedded microcontroller peripheral interfaces requiring stable component supply across long production lifecycles.

Supply support for 74AHCT273PW,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.

The 74AHCT series belongs to Nexperia's advanced logic portfolio, engineered specifically for robust 5 V system interfacing with TTL compatibility, industrial temperature resilience, and low dynamic power consumption.

FAQ

What is the maximum clock frequency supported by the 74AHCT273PW,118?

The 74AHCT273PW,118 supports up to 120 MHz maximum frequency under ideal conditions (VCC = 5 V, CL = 15 pF, Tamb = 25 °C). At full industrial temperature (-40 °C to +125 °C) and 50 pF load, the guaranteed minimum fmax is 70 MHz per datasheet Table 7. This reflects actual timing margins needed for reliable operation in real-world PCB layouts with trace capacitance and noise.

Can the 74AHCT273PW,118 operate with a 3.3 V supply?

No - the 74AHCT273PW,118 is specified only for 4.5 V to 5.5 V operation (Table 5). Its TTL-compatible input thresholds require ≥4.5 V VCC to guarantee VIH ≥2.0 V and VIL ≤0.8 V. Using 3.3 V risks undervoltage lockout, incorrect logic interpretation, and potential output contention; the 74AHC273 variant is recommended for 3.3 V systems.

Is the master reset (MR) pin synchronous or asynchronous?

The MR pin is fully asynchronous: asserting MR LOW forces all Q outputs LOW immediately, regardless of CP state or timing. This behavior is confirmed in Table 3 (Function table) and Section 6 (Functional description), where "Reset (clear)" mode is defined as MR = L, CP = X, resulting in Qn = L. No clock edge is required for reset activation or release.

Does the 74AHCT273PW,118 require external pull-up or pull-down resistors on unused inputs?

No - all inputs feature integrated Schmitt-trigger action and have no floating-state requirement. However, unused inputs must still be terminated to a defined logic level (VCC or GND) to prevent oscillation, increased ICC, and EMI. This is mandated by Section 2 ("Features and benefits") and JEDEC standards for CMOS devices; unconnected inputs may draw excessive current or cause unpredictable output states.