Nexperia USA Inc. 74HCT393BQ-Q100X

Overview

74HCT393BQ-Q100 from Nexperia is an automotive-qualified dual 4-bit binary ripple counter IC with TTL-compatible inputs, asynchronous master reset per counter, and DHVQFN14 package. It advances on HIGH-to-LOW clock transitions, delivers up to 48 MHz max clock frequency at VCC = 4.5 V, features 3.5 pF input capacitance, and operates from −40 °C to +125 °C for engine control and body electronics timing functions.

For engineers reviewing the 74HCT393BQ-Q100 datasheet, 74HCT393BQ-Q100 pinout, 74HCT393BQ-Q100 application, or 74HCT393BQ-Q100 equivalent, this device serves as a low-power, AEC-Q100 Grade 1–qualified binary divider for automotive clock domain partitioning, pulse counting, and event synchronization where precise ripple-stage propagation delay (e.g., 6 ns typical nQx→nQ(x+1) at 4.5 V) and independent reset control are required.

Technical Context

This dual counter implements two independent 4-stage ripple chains using edge-triggered D-type flip-flops, each advancing on the HIGH-to-LOW transition of its dedicated clock input (1CP or 2CP). Each chain includes an active-HIGH asynchronous master reset (1MR/2MR) that forces all four outputs LOW regardless of clock state.

Input levels conform to TTL thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V at VCC = 4.5–5.5 V), enabling direct interfacing with legacy microcontroller GPIOs and logic families. The DHVQFN14 package supports AOI-capable solder joint inspection and thermal performance suitable for under-hood environments.

Key Specifications

Pinout & Package

DHVQFN14 package (SOT762-1), 2.5 × 3 × 0.85 mm body, side-wettable flanks for AOI, no leads, 14 terminals. Exposed thermal pad (terminal 1 index area) may be left floating or connected to VCC per datasheet guidance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HC393BQ-Q100, the HCT version provides guaranteed TTL compatibility essential for legacy automotive MCU interfaces, while SN74LV393APWR offers broader voltage operation at the expense of automotive qualification and slightly reduced speed - making the 74HCT393BQ-Q100 optimal for new AEC-Q100–mandated designs requiring drop-in TTL signal acceptance.

Availability

74HCT393BQ-Q100 is available at Aetrix Electronics and suitable for engine control units, ADAS sensor interfaces, body control modules, and instrument clusters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HCT393BQ-Q100 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, high-reliability logic, analog, and discrete components, with leadership in automotive-grade standard products.

The 74HCT393BQ-Q100 belongs to Nexperia's AEC-Q100–qualified logic portfolio, designed specifically for automotive timing, signal conditioning, and control applications demanding robustness across harsh environmental conditions.

FAQ

What is the maximum clock frequency supported by the 74HCT393BQ-Q100?

The 74HCT393BQ-Q100 supports a maximum clock frequency of 48 MHz at VCC = 4.5 V with CL = 15 pF, as specified in Table 7 of the datasheet. At VCC = 5.0 V and CL = 15 pF, it achieves 53 MHz. Performance degrades at higher temperatures and larger loads - e.g., 28 MHz at −40 °C to +125 °C with CL = 50 pF.

Can the two counters operate synchronously from a shared clock input?

No - the 74HCT393BQ-Q100 has separate clock inputs (1CP and 2CP) with no internal synchronization logic. Driving both clocks from the same source causes asynchronous ripple propagation between counters due to trace skew and internal gate delays, resulting in unpredictable relative output timing. For synchronized operation, external gating or a synchronous counter IC is required.

Is the exposed thermal pad on the DHVQFN14 package required to be soldered?

No. Per Figure 8 and datasheet note (1), the exposed pad (terminal 1 index area) has no electrical or mechanical requirement to be soldered. If connected, it must remain electrically floating or tied to VCC - grounding or leaving it unconnected is acceptable. Thermal performance meets spec without pad attachment, though soldering improves θ_JA by ~10 °C/W.

How does the asynchronous master reset affect output timing behavior?

The asynchronous master reset (1MR/2MR) forces all four associated outputs LOW within 42 ns (max) at VCC = 4.5 V, independent of clock state or propagation through the ripple chain. This immediate clearing enables precise event alignment - for example, resetting counter 1 upon detecting a fault condition while allowing counter 2 to continue measuring background activity.