Nexperia USA Inc. 74LVC161PW,118

Overview

74LVC161PW,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. Used in digital timing control, address sequencing, and multi-stage counter chains in industrial PLCs and instrumentation.

For engineers reviewing the 74LVC161PW,118 datasheet, 74LVC161PW,118 pinout, 74LVC161PW,118 application, or 74LVC161PW,118 equivalent, this device is selected for synchronous counting with deterministic preset load, low-power CMOS operation, Schmitt-trigger input noise immunity, and guaranteed -40 °C to +125 °C performance across TSSOP16 packaging.

Technical Context

The 74LVC161PW implements four edge-triggered D-type flip-flops clocked synchronously on the positive-going edge of CP. Counting requires both CEP and CET asserted HIGH; TC asserts HIGH only when CET = HIGH and Q3–Q0 = 1111, enabling direct feed-forward to next stage. Preset loading occurs synchronously on CP edge when PE = LOW, independent of CE states.

Asynchronous MR forces Q0–Q3 LOW regardless of CP, PE, CEP, or CET state. All inputs feature Schmitt-trigger action for robust handling of slow-rising signals, and overvoltage tolerance allows interfacing with 5 V logic while powered at 1.2–3.6 V. Propagation delay from CP to Qn is ≤9.5 ns (VCC = 3.0–3.6 V, -40 °C to +125 °C).

Key Specifications

Pinout & Package

TSSOP16 package (SOT403-1): plastic thin shrink small outline, 16 leads, 4.4 mm body width, 0.65 mm pitch, exposed pad not electrically connected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74LVC161PW,118, the 74LVC163PW lacks asynchronous reset but offers identical cascading and preset functionality, while SN74LV161APW trades 1.2 V compatibility for broader 5 V interoperability - making the original optimal for mixed-voltage, low-power, and safety-critical clear-on-fail designs.

Availability

74LVC161PW,118 is available at Aetrix Electronics and suitable for industrial motion control, programmable logic controller (PLC) I/O sequencing, and digital panel meter display driver applications requiring stable component supply across extended temperature and mixed-voltage environments.

Supply support for 74LVC161PW,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 optimized for efficiency, reliability, and manufacturability in high-volume applications.

The 74LVC161PW belongs to Nexperia's LVC logic family, designed specifically for low-voltage, mixed-signal systems requiring robust noise immunity, wide supply flexibility, and seamless 3.3 V/5 V interface translation.

FAQ

What is the minimum supply voltage for reliable operation of the 74LVC161PW,118?

The 74LVC161PW,118 is fully specified down to 1.2 V supply voltage across its entire operating temperature range (-40 °C to +125 °C). At 1.2 V, VIH is guaranteed ≥1.08 V and VOL ≤0.12 V with 100 μA load, enabling use in energy-constrained battery-powered systems where higher-voltage logic cannot operate.

Can the 74LVC161PW,118 be used to cascade more than two counter stages reliably?

Yes - the look-ahead carry architecture ensures TC propagates within one clock cycle regardless of cascade depth. With CEP and CET inputs, up to 16-bit or longer counters can be built by feeding TC of stage N to CET of stage N+1, maintaining synchronous alignment and avoiding ripple-delay accumulation seen in ripple-carry designs.

Does the Schmitt-trigger input on the 74LVC161PW,118 eliminate the need for external debouncing circuitry?

Schmitt-trigger inputs provide hysteresis (typical 0.3–0.5 V) that rejects noise and stabilizes slow transitions, making them suitable for direct connection to mechanical switches or RC-filtered signals. However, for high-reliability applications subject to ESD or contact bounce exceeding 100 μs, external RC filtering or firmware debouncing remains recommended.

Is the TSSOP16 package (SOT403-1) of the 74LVC161PW,118 compatible with standard reflow profiles?

Yes - the SOT403-1 package is qualified for standard lead-free reflow per JEDEC J-STD-020. Peak temperature must not exceed 260 °C, with time above 217 °C limited to 60–150 seconds. The package's 0.65 mm pitch and thermal characteristics support automated assembly in high-yield SMT lines without special tooling.