NXP Semiconductors 74HCT4066DB,112

Overview

74HCT4066DB,112 from Nexperia is a quad SPST analog switch IC with TTL-compatible enable inputs, 45 Ω typical ON resistance at 5 V, ±25 mA switch current rating, and operation across -40 °C to +125 °C. It routes bidirectional analog or digital signals in test equipment multiplexers, sensor interface conditioning, and audio signal path selection.

For engineers reviewing the 74HCT4066DB,112 datasheet, 74HCT4066DB,112 pinout, 74HCT4066DB,112 application, or 74HCT4066DB,112 equivalent, key selection criteria include its 5 V TTL-level enable compatibility, low 12 pF power dissipation capacitance, 18 ns max turn-on time at 4.5 V, -60 dB crosstalk suppression, and SO14 package thermal performance up to 125 °C ambient.

Technical Context

The 74HCT4066DB,112 implements four independent bilateral analog switches, each controlled by an active-HIGH TTL-compatible enable (nE) input. Its CMOS transmission gate architecture supports rail-to-rail analog signal switching with no polarity restriction on Y/Z terminals.

Each switch features integrated input clamp diodes enabling safe interfacing to voltages exceeding VCC when used with current-limiting resistors. The device complies with JEDEC standard no. 7A and meets ANSI/ESDA/JEDEC JS-001 Class 2 (≥2000 V HBM) and JS-002 Class C3 (≥1000 V CDM) ESD protection requirements.

Key Specifications

Pinout & Package

74HCT4066DB,112 is supplied in a plastic small outline package (SO14), SOT108-1, with 14 leads and 3.9 mm body width. The exposed pad is not electrically connected and requires no soldering.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar analog switch applications.

Compared with 74HC4066DB,112 and TS5A23157DCUR, the 74HCT4066DB,112 provides guaranteed TTL-level compatibility and robust 125 °C operation-making it optimal for industrial control and automotive environments where logic family interoperability and thermal reliability outweigh ultra-low RON requirements.

Availability

74HCT4066DB,112 is available at Aetrix Electronics and suitable for test equipment multiplexers, sensor interface conditioning, and audio signal path selection requiring stable component supply across extended temperature ranges.

Supply support for 74HCT4066DB,112 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 leading semiconductor manufacturer specializing in high-performance logic, analog, and discrete components for automotive, industrial, and consumer applications.

The 74HCT4066 product line delivers robust, temperature-hardened analog switching solutions designed specifically for signal routing in harsh-environment embedded systems and precision instrumentation.

FAQ

What is the maximum supply voltage for the 74HCT4066DB,112?

The 74HCT4066DB,112 has an absolute maximum supply voltage (VCC) of +11.0 V, but its recommended operating range is strictly 4.5 V to 5.5 V per JEDEC-compliant specifications. Operating outside this window risks violating TTL input thresholds and degrading ON resistance linearity. Always refer to Table 5 in the official Nexperia datasheet for 74HCT4066DB,112 to confirm valid voltage margins under your thermal and load conditions.

Does the 74HCT4066DB,112 support bidirectional analog signal switching?

Yes, the 74HCT4066DB,112 supports fully bidirectional analog signal routing between each Y and Z terminal pair. Its CMOS transmission gate structure imposes no polarity constraints-signals can flow from Y to Z or Z to Y with identical RON, THD, and bandwidth performance. This symmetry is confirmed in Figure 3 (schematic diagram) and Table 9 (dynamic characteristics) of the 74HCT4066DB,112 datasheet.

What is the thermal derating behavior of the 74HCT4066DB,112 in SO14 package?

The 74HCT4066DB,112 in SOT108-1 (SO14) package has a total power dissipation limit of 500 mW at Tamb ≤ 100 °C, derating linearly at 10.1 mW/K above that temperature. At 125 °C ambient, the usable power drops to approximately 247 mW. This derating is specified in Table 4 of the 74HCT4066DB,112 datasheet and must be applied when calculating worst-case junction temperature in sealed enclosures or high-power-density PCB layouts.

Can the 74HCT4066DB,112 be used with 3.3 V logic control signals?

No-the 74HCT4066DB,112 requires a minimum VIH of 2.0 V for reliable enable activation, but its TTL-input design expects VCC = 4.5–5.5 V. Driving 1E–4E with 3.3 V logic may result in marginal or undefined switching behavior, especially over temperature. For 3.3 V systems, use the 74HC4066DB,112 variant instead, which guarantees VIH ≥ 3.15 V at VCC = 4.5 V per Table 7 of the 74HCT4066DB,112 datasheet.

How does the 74HCT4066DB,112 handle overvoltage conditions on Y/Z terminals?

The 74HCT4066DB,112 integrates input clamp diodes on all Y and Z terminals, allowing safe operation with voltages up to VCC + 0.5 V or down to GND − 0.5 V-provided external current-limiting resistors restrict IIK and ISK to ±20 mA (Table 4). This feature eliminates need for external protection diodes in many sensor or mixed-signal interface designs, as explicitly stated in Section 1 (General description) of the 74HCT4066DB,112 datasheet.