Nexperia USA Inc. 74HC273DB,118

Overview

74HC273DB,118 from Nexperia is an octal positive-edge-triggered D-type flip-flop with asynchronous master reset (MR), operating from 2.0 V to 6.0 V supply, delivering 15 ns typical propagation delay at 4.5 V, and specified for -40 °C to +125 °C industrial temperature range. It functions as a synchronous data latch in digital control logic, bus interface buffering, and state register stages of microcontroller peripherals.

For engineers reviewing the 74HC273DB,118 datasheet, 74HC273DB,118 pinout, 74HC273DB,118 application, or 74HC273DB,118 equivalent, this device supports high-noise-immunity CMOS-level input compatibility, precise set-up/hold timing (12 ns / 3 ns at 4.5 V), and low-power operation (8 μA ICC typical), making it suitable for deterministic edge-triggered storage in embedded control and industrial I/O expansion.

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 captures the logic state of its Dn input on the LOW-to-HIGH transition of CP, provided set-up (12 ns min) and hold (3 ns min) timing requirements are met. MR overrides clock and data, forcing all Qn outputs LOW asynchronously.

Input clamping diodes enable safe interfacing to voltages exceeding VCC when used with current-limiting resistors. The design complies with JEDEC JESD7A (2.0–6.0 V) and JESD8C (2.7–3.6 V), supports HBM ESD >2000 V, and exhibits latch-up immunity >100 mA per JESD78 Class II Level B.

Key Specifications

Pinout & Package

74HC273DB,118 is supplied in the SOT339-1 (SO20) package: plastic small outline, 20-pin, 7.5 mm body width, gull-wing leads. Pin 1 is marked by a bevelled corner or index notch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HC273DB,118, the 74HCT273DB,118 offers superior TTL input compatibility at the cost of marginally higher supply current, while SN74HC273PWR provides identical functionality in a smaller TSSOP package-enabling compact layouts but demanding tighter assembly control.

Availability

74HC273DB,118 is available at Aetrix Electronics and suitable for industrial automation controllers, microcontroller peripheral interfaces, LED matrix drivers, and digital test equipment requiring stable component supply across extended temperature ranges.

Supply support for 74HC273DB,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 specializing in high-performance, energy-efficient logic, analog, and discrete components, headquartered in Nijmegen, Netherlands.

The 74HC273 belongs to Nexperia's standard logic portfolio designed for robust, pin-compatible replacements in industrial, automotive (where qualified), and consumer digital systems requiring predictable timing and wide supply flexibility.

FAQ

What is the maximum clock frequency supported by the 74HC273DB,118?

The 74HC273DB,118 supports a maximum clock frequency of 30 MHz at VCC = 4.5 V and CL = 50 pF, based on its 15 ns typical propagation delay and 16 ns minimum pulse width requirement. At VCC = 6.0 V, fmax increases to 35 MHz, but system-level timing margins must account for PCB trace delays and load capacitance beyond the 50 pF test condition.

Can the MR pin be left unconnected or pulled HIGH via a weak resistor?

No - the MR pin must be actively driven HIGH (≥VCC − 0.5 V) or pulled HIGH via ≤10 kΩ resistor to prevent unintended reset. Floating MR violates the recommended operating condition (VI = 0 to VCC) and risks metastable behavior due to noise coupling, as MR has no internal pull-up and is TTL/CMOS compatible with no default state.

Does the 74HC273DB,118 support hot insertion or live insertion into a powered backplane?

No - the 74HC273DB,118 lacks hot-swap protection features such as power-up 3-state or soft-start circuitry. Applying VCC before GND, or connecting inputs before supply stabilization, may exceed absolute maximum ratings (e.g., VI > VCC + 0.5 V), risking latch-up or permanent damage per JESD78 Class II Level B stress limits.

How does the input clamping diode affect interfacing with 12 V sensors?

The integrated input clamping diodes allow safe connection to 12 V signals when used with a series current-limiting resistor ≥560 Ω, limiting IIK to ≤20 mA per diode. This enables direct interface without external Schottky clamps, but resistor value must be calculated using (12 V − VCC − 0.7 V)/20 mA to ensure compliance with absolute maximum input clamping current.