onsemi MC74ACT04DT

Overview

MC74ACT04DT from onsemi is a hex inverter IC with TTL-compatible inputs, designed for digital logic level translation and signal inversion in 5 V systems. It delivers ±24 mA output drive per channel, supports −40°C to +85°C operating temperature, and uses a 14-lead TSSOP package (Case 948G). It is commonly deployed in bus buffering, clock signal conditioning, and control logic circuits.

For engineers reviewing the MC74ACT04DT datasheet, pinout, applications, or equivalent options, key selection considerations include its 5.0 V nominal supply operation, 8.5 ns typical propagation delay (tPLH/tPHL), guaranteed VIH/VIL thresholds for TTL compatibility, and TSSOP-14 thermal and board-space advantages over SOIC or PDIP variants.

Technical Context

The MC74ACT04DT implements six independent CMOS inverters with buffered outputs and TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V). Its design targets high-speed 5 V logic interfacing where noise immunity and fanout capability are critical.

It operates strictly within 4.5 V to 5.5 V supply range, exhibits 4.5 pF typical input capacitance, and draws ≤40 µA quiescent ICC. Propagation delays are characterized at CL = 50 pF and TA = −40°C to +85°C, with tPLH/tPHL ≤9.0 ns max under worst-case conditions.

Key Specifications

Pinout & Package

TSSOP-14 package (Case 948G), 4.9 mm × 4.4 mm body, 0.65 mm pitch, lead-free compliant, moisture sensitivity level (MSL) 1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar hex inverter applications.

Compared with SN74ACT04DR and 74VHC04MTCX, the MC74ACT04DT provides identical logic functionality and TTL compatibility in a space-saving TSSOP-14 package with superior thermal performance-making it optimal for high-density industrial PCBs requiring 5 V signal integrity and long-term component availability.

Availability

MC74ACT04DT is available at Aetrix Electronics and suitable for industrial control logic, microcontroller peripheral buffering, legacy bus interface, and test equipment signal conditioning requiring stable component supply, RoHS compliance, and long-lifecycle support.

Supply support for MC74ACT04DT 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient silicon solutions for automotive, industrial, cloud, and IoT applications.

The MC74ACT04DT belongs to the 74ACT logic family, engineered for high-speed, TTL-compatible 5 V digital interfacing with enhanced noise immunity and drive strength-targeting industrial automation, instrumentation, and legacy system upgrades.

FAQ

What is the recommended operating voltage range for the MC74ACT04DT?

The MC74ACT04DT is specified for operation only between 4.5 V and 5.5 V. Operation below 4.5 V violates the guaranteed TTL-compatible input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V), and operation above 5.5 V exceeds absolute maximum ratings. The MC74ACT04DT must be powered from a well-regulated 5 V supply meeting these limits to ensure functional correctness and reliability.

Does the MC74ACT04DT support 3.3 V logic inputs?

No-the MC74ACT04DT does not guarantee correct operation with 3.3 V logic inputs. Its input thresholds are fixed for TTL compatibility: VIH minimum is 2.0 V and VIL maximum is 0.8 V at VCC = 4.5–5.5 V. A 3.3 V CMOS high signal (typically ~3.3 V) meets VIH, but a 3.3 V system's low signal (~0 V) remains valid; however, the MC74ACT04DT is not characterized or rated for VCC < 4.5 V, so 3.3 V supply operation is invalid. Use MC74VHC04 or similar for true 3.3 V compatibility.

What is the maximum capacitive load the MC74ACT04DT can drive while maintaining specified propagation delay?

The MC74ACT04DT AC specifications-including tPLH and tPHL-are characterized at CL = 50 pF. Driving loads significantly above 50 pF increases propagation delay nonlinearly and may degrade edge rates. For loads >50 pF, derating curves from the official datasheet (Figure 3–6) must be applied; the MC74ACT04DT is not intended for direct termination of transmission lines or heavy capacitive buses without buffering.

Is the MC74ACT04DT pin-compatible with the MC74AC04DT?

Yes-the MC74ACT04DT and MC74AC04DT share identical pinout, package (TSSOP-14), and function (hex inverter), but differ electrically: MC74ACT04DT has TTL-compatible inputs and is rated only for 4.5–5.5 V, whereas MC74AC04DT accepts 2.0–6.0 V and has CMOS-input thresholds. Substituting MC74AC04DT for MC74ACT04DT may cause incorrect logic interpretation in TTL-driven systems due to higher VIH/VIL.

What thermal considerations apply to the MC74ACT04DT in continuous operation?

The MC74ACT04DT has no specified junction-to-ambient thermal resistance (θJA) for TSSOP-14 in the datasheet, but typical θJA for this package on 1-layer 1 oz copper is ~180°C/W. At full 24 mA output load on all six channels, total power dissipation remains <15 mW-well within safe limits. However, PCB layout must include adequate copper pour on GND/VCC pins and avoid enclosing the MC74ACT04DT under shields to prevent localized heating.