Nexperia USA Inc. 74HC40103D,652

Overview

74HC40103D,652 from Nexperia is an 8-bit synchronous binary down counter with asynchronous master reset (MR), synchronous/asynchronous preset (PE/PL), terminal enable (TE), and active-low terminal count (TC) output. It operates across 2.0 V to 6.0 V, delivers ≤60 ns propagation delay at 4.5 V, supports cascading via TE/TC, and functions in industrial-temperature range (−40 °C to +125 °C). It is used in programmable timers and divide-by-N clock generation circuits.

For engineers reviewing the 74HC40103D,652 datasheet, 74HC40103D,652 pinout, 74HC40103D,652 application, or 74HC40103D,652 equivalent, key selection criteria include its dual-mode preset capability, guaranteed TC pulse width at zero count, SO16 package compatibility with legacy 74HC logic footprints, and verified operation under 125 °C ambient conditions.

Technical Context

This device implements a fully synchronous 8-bit decrementer with independent control paths: MR forces count = 255 asynchronously; PL loads jam inputs P0–P7 asynchronously; PE enables synchronous load on next CP rising edge; TE gates counting but does not affect preset or reset. The TC output asserts low for one full clock period upon reaching zero, enabling precise timing termination.

Internal architecture uses eight cascaded D-type flip-flops with shared clock (CP) and individual jam input routing. Input clamp diodes allow interfacing to voltages exceeding VCC when used with current-limiting resistors. Logic levels conform to standard CMOS thresholds, ensuring interoperability with 74HC/74HCT families.

Key Specifications

Pinout & Package

74HC40103D,652 is housed in a plastic small outline package (SO16, SOT109-1) with 16 leads and 3.9 mm body width. Pin 1 is marked by a notch or dot; pin numbering follows standard SOIC convention.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit synchronous down counter applications.

Compared with 74HC40103D,652, the PW variant offers superior thermal dissipation in compact layouts, while the SN74HC40103N provides mechanical robustness and ease of manual assembly-neither alters functional behavior or timing margins.

Availability

74HC40103D,652 is available at Aetrix Electronics and suitable for programmable timers, divide-by-N counters, interrupt timers, and cycle counters requiring stable component supply across automotive, industrial automation, and test equipment programs.

Supply support for 74HC40103D,652 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 discrete components with focus on efficiency, reliability, and sustainability.

The 74HC40103 belongs to Nexperia's high-speed CMOS logic family, designed specifically for robust timing control in industrial, automotive, and consumer systems where deterministic counting and low-power operation are critical.

FAQ

What is the minimum pulse width required on the CP input?

The minimum CP pulse width is 21 ns at VCC = 6.0 V, per dynamic characteristics table. This ensures reliable edge detection and internal state capture. At lower supply voltages, the required width increases - e.g., 28 ns at VCC = 4.5 V and 33 ns at VCC = 2.0 V. Pulse widths below these values risk metastability or missed transitions.

How does the TC output behave when TE is HIGH?

When TE is HIGH, counting is inhibited and the TC output remains HIGH regardless of counter value. TC only goes LOW when the count reaches zero AND TE is LOW. This behavior allows TC to serve as a clean, gated end-of-count signal without spurious pulses during disabled states.

Can P0–P7 be changed while the counter is running?

Yes - jam inputs P0–P7 may be updated at any time, but changes only take effect on the next valid preset event: either asynchronous load (PL = LOW) or synchronous load (PE = LOW + CP rising edge). No glitch or race condition occurs during updates, as inputs are latched only on control activation.

Is the 74HC40103D,652 compatible with 5 V TTL logic inputs?

No - it is a CMOS device with VIH ≥ 3.15 V (min) at VCC = 4.5 V, which exceeds standard TTL VOH (2.4 V). Direct connection to 5 V TTL outputs risks unreliable HIGH recognition. Use level-shifting buffers or 74HCT-series translators to ensure compatible voltage thresholds.