Nexperia USA Inc. 74LVC161DB,118

Overview

74LVC161DB,118 from Nexperia is a synchronous presettable 4-bit binary counter with asynchronous master reset (MR), internal look-ahead carry, and dual count-enable inputs (CEP/CET) for cascading. It operates from 1.2 V to 3.6 V, supports 3.3 V/5 V mixed-voltage interfacing via overvoltage-tolerant inputs (up to 5.5 V), and delivers terminal count (TC) pulse width ≈ Q0 HIGH duration for reliable multi-stage timing in digital control systems.

For engineers reviewing the 74LVC161DB,118 datasheet, 74LVC161DB,118 pinout, 74LVC161DB,118 application, or 74LVC161DB,118 equivalent, this device serves as a JEDEC-compliant, temperature-stable (–40 °C to +125 °C) building block for synchronous counting, address generation, and state-machine sequencing where deterministic load-on-clock, glitch-free TC propagation, and Schmitt-trigger noise immunity are required.

Technical Context

The 74LVC161DB,118 implements four edge-triggered D-type flip-flops with synchronous parallel loading via active-low PE and asynchronous clear via active-low MR. Its look-ahead carry architecture enables low-latency serial cascading: CET must be HIGH to enable TC output, which pulses HIGH only when counter reaches 15 (1111) and CET = HIGH - duration matches Q0 HIGH time.

Input logic includes Schmitt-trigger action on all pins for robustness against slow edges, and overvoltage tolerance (≤5.5 V) allows direct interfacing with 5 V TTL or LVTTL sources while powered from 1.2–3.6 V supplies. Timing is strictly positive-edge–triggered on CP; all functional transitions occur within 9.5 ns (VCC = 3.0–3.6 V, –40 °C to +125 °C).

Key Specifications

Pinout & Package

74LVC161DB,118 is packaged in SO16 (SOT109-1): plastic small outline, 16-pin, 3.9 mm body width, lead pitch 1.27 mm.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 4-bit synchronous binary counter applications.

Compared with SN74LVC161APWR and 74LVC163PW,118, the 74LVC161DB,118 uniquely combines asynchronous MR for fail-safe clearing, TC output for seamless cascading, and SO16 packaging for through-hole or legacy-compatible SMT assembly - making it optimal for industrial control and retrofit designs requiring deterministic reset and proven mechanical reliability.

Availability

74LVC161DB,118 is available at Aetrix Electronics and suitable for industrial motion control, digital power sequencing, programmable logic interface, and legacy system emulation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74LVC161DB,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, reliable logic, analog, and discrete components optimized for efficiency, miniaturization, and robustness in demanding applications.

The 74LVC161DB,118 belongs to Nexperia's LVC logic family - engineered for ultra-low power consumption, wide supply flexibility (1.2–3.6 V), and mixed-voltage interoperability in industrial, automotive, and computing systems.

FAQ

What is the maximum operating frequency of the 74LVC161DB,118 at 3.3 V and 125 °C?

The 74LVC161DB,118 supports a maximum clock frequency of 120 MHz under recommended operating conditions (VCC = 3.0–3.6 V, Tamb = –40 °C to +125 °C), as specified in Table 7 of the datasheet. This value accounts for worst-case process, voltage, and temperature (PVT) corners and includes margin for setup/hold timing compliance.

Can the 74LVC161DB,118 be used with a 5 V microcontroller driving its clock and control inputs?

Yes - all inputs are overvoltage tolerant up to 5.5 V, allowing direct connection to 5 V microcontrollers even when VCC is as low as 1.2 V. No external level shifters are required, simplifying mixed-voltage interface design while maintaining full timing and logic integrity.

How does the terminal count (TC) output behave during cascading, and what is its pulse width?

TC goes HIGH only when both CEP and CET are HIGH and the counter reaches 15 (1111). Its pulse width equals the HIGH time of Q0, enabling reliable triggering of the next cascaded stage. Propagation delay from CP to TC is ≤10.0 ns (VCC = 3.0–3.6 V, –40 °C to +125 °C), ensuring minimal inter-stage latency.

Is the asynchronous master reset (MR) functional independently of the clock and enable inputs?

Yes - MR is fully asynchronous and forces Q0–Q3 LOW immediately upon going LOW, regardless of CP, PE, CEP, or CET states. This behavior is guaranteed across the full operating temperature and voltage range and is unaffected by clock glitches or enable misconfiguration.