Nexperia USA Inc. 74HC393DB,118

Overview

74HC393DB,118 from Nexperia is a dual 4-bit binary ripple counter IC with two independent asynchronous master reset inputs (1MR, 2MR), two edge-triggered clock inputs (1CP, 2CP), and eight buffered outputs (1Q0–1Q3, 2Q0–2Q3). It operates from 2.0 V to 6.0 V, advances on HIGH-to-LOW clock transitions, and clears all flip-flops to LOW when MR is HIGH - used in frequency division, timing control, and digital logic state sequencing within industrial control panels and instrumentation.

For engineers reviewing the 74HC393DB,118 datasheet, 74HC393DB,118 pinout, 74HC393DB,118 application, or 74HC393DB,118 equivalent, this device supports precise binary division by 2ⁿ (n ≤ 4) per counter, delivers sub-25 ns propagation delay at 4.5 V, maintains CMOS-level input compatibility, and enables independent reset of each 4-bit stage - critical for multi-channel event counting and cascaded timing architectures.

Technical Context

This dual counter implements two independent 4-stage T-type flip-flop chains, each advancing synchronously on the falling edge of its dedicated clock input. The asynchronous master reset overrides clock activity and forces all four outputs LOW regardless of current count state or clock phase.

Each counter's output stages drive standard CMOS loads with VOH ≥ 4.4 V and VOL ≤ 0.26 V at VCC = 4.5 V and IO = ±4 mA, while input clamping diodes allow safe interfacing to voltages exceeding VCC when used with current-limiting resistors.

Key Specifications

Pinout & Package

74HC393DB,118 is packaged in SO14 (SOT108-1): plastic small outline, 14-pin, 3.9 mm body width, with gull-wing leads and pin 1 index marker.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual binary counter applications.

Compared with 74HCT393DB,118, the original part offers broader supply flexibility and superior noise immunity at low VCC, while SN74LV393AIPW reduces power and simplifies 3.3 V system design but sacrifices 2.0 V startup capability and 6.0 V tolerance.

Availability

74HC393DB,118 is available at Aetrix Electronics and suitable for industrial timer modules, microcontroller peripheral expansion, test equipment event counters, and legacy system bus glue logic requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HC393DB,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 delivering high-performance logic, analog, and MOSFET solutions with focus on efficiency, reliability, and scalability for industrial, automotive, and consumer applications.

The 74HC393DB,118 belongs to Nexperia's HC logic family - engineered for low-power, high-noise-immunity digital signal routing and timing control in harsh industrial environments and space-constrained embedded systems.

FAQ

What is the maximum clock frequency supported by 74HC393DB,118?

The 74HC393DB,118 achieves up to 107 MHz maximum clock frequency at VCC = 6.0 V with CL = 15 pF load, as specified in Table 7 of the Rev. 9 datasheet. At 4.5 V, fclk(max) is 90 MHz under the same conditions. Performance degrades linearly below 4.5 V, dropping to 625 kHz at VCC = 2.0 V due to increased propagation delay.

Can 74HC393DB,118 be used with 3.3 V microcontrollers?

Yes - the 74HC393DB,118 operates reliably from 2.0 V to 6.0 V and features CMOS-compatible inputs with VIH(min) = 1.5 V at VCC = 2.0 V and 3.15 V at VCC = 4.5 V. When powered at 3.3 V, it accepts standard 3.3 V logic levels and drives outputs to ≥2.9 V (VOH) and ≤0.33 V (VOL) at 4 mA load, ensuring clean interfacing with ARM Cortex-M or ESP32 GPIOs.

How does the asynchronous reset behave during clock activity?

The 1MR and 2MR inputs are fully asynchronous: asserting either HIGH immediately forces its associated counter's outputs (1Q0–1Q3 or 2Q0–2Q3) LOW, overriding any ongoing clock transitions or internal state. This occurs independently per counter, with no setup/hold timing requirements relative to nCP, and completes within tPHL ≤ 36 ns at VCC = 6.0 V as measured from MR assertion to first output transition.

Is 74HC393DB,118 pin-compatible with 74HC393D or 74HC393PW?

Yes - all three variants (74HC393DB,118, 74HC393D, and 74HC393PW) share identical pin functions and electrical specifications. The "DB" suffix denotes SO14 (SOT108-1), "D" is also SO14, and "PW" is TSSOP14 (SOT402-1). Mechanical footprint differs between SO14 and TSSOP14, but signal mapping, timing, and logic behavior are fully interchangeable across packages.