onsemi DM74AS04SJX

Overview

DM74AS04SJX from Fairchild Semiconductor is a hex inverter IC implementing six independent TTL-compatible logic inverters in a 14-lead SOP (EIAJ TYPE II, 5.3 mm wide) package. It operates at VCC = 4.5–5.5 V, delivers IOL = 20 mA sink current per gate, achieves tPLH/tPHL ≤ 5 ns/4 ns at CL = 50 pF, and is rated for 0°C to +70°C industrial temperature range - used in digital control logic buffering and signal polarity inversion.

For engineers reviewing the DM74AS04SJX datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed AC performance over full VCC and temperature range, Schottky TTL compatibility, output drive strength, propagation delay consistency, and SOIC package thermal resistance (θJA = 115.0°C/W).

Technical Context

The DM74AS04SJX uses an advanced oxide-isolated, ion-implanted Schottky TTL process to deliver improved AC performance versus standard Schottky and low-power Schottky TTL families. Its logic function is strictly inverting (Y = A̅), with no internal feedback or enable controls.

It guarantees switching specifications at 50 pF load across the full recommended operating range (VCC = 4.5–5.5 V, TA = 0–70°C), and exhibits input clamp voltage VIK = −1.2 V under −18 mA injection - enabling robust noise immunity and bus-driving capability in mixed-signal digital systems.

Key Specifications

Pinout & Package

DM74AS04SJX is housed in a 14-lead Small Outline Package (SOP), EIAJ TYPE II, 5.3 mm wide (Package Number M14D), with gull-wing leads and standard JEDEC footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AS04DR and 74ACT04PW, the DM74AS04SJX offers the fastest propagation (≤4 ns), best drive strength-to-speed ratio, and widest legacy TTL interoperability - making it optimal for timing-critical industrial control and legacy system upgrades where Schottky TTL compatibility is mandatory.

Availability

DM74AS04SJX is available at Aetrix Electronics and suitable for industrial control logic, digital test equipment, bus interface translation, and legacy system repair requiring stable component supply and long-term obsolescence management.

Supply support for DM74AS04SJX 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

Fairchild Semiconductor was a U.S.-based semiconductor company specializing in analog and discrete power products, acquired by ON Semiconductor in 2016. Known for high-reliability logic and power devices.

The DM74AS04SJX belongs to Fairchild's Advanced Schottky TTL logic family, designed specifically for high-speed, noise-immune digital control in industrial automation and instrumentation systems where legacy TTL compatibility and deterministic timing are essential.

FAQ

What is the maximum operating temperature for the DM74AS04SJX?

The DM74AS04SJX is rated for a free-air operating temperature range of 0°C to +70°C, as specified in the Recommended Operating Conditions table. This makes it suitable for commercial and industrial environments without extended thermal derating. The device's absolute maximum storage temperature is −65°C to +150°C, but sustained operation outside the 0–70°C range is not guaranteed. Always verify ambient and junction temperatures using θJA = 115.0°C/W in thermal design.

Is the DM74AS04SJX pin-compatible with the 74LS04?

Yes, the DM74AS04SJX is functionally and pin-for-pin compatible with the 74LS04 and other standard Schottky TTL hex inverters. Its pinout matches the industry-standard 14-lead configuration: inputs on pins 1,3,5,9,11,13; outputs on pins 2,4,6,8,10,12; VCC on pin 14; GND on pin 7. No PCB changes are required when upgrading from 74LS04 to DM74AS04SJX in existing designs.

What load capacitance is used to specify the switching characteristics of the DM74AS04SJX?

The DM74AS04SJX switching characteristics - including tPLH and tPHL - are guaranteed at CL = 50 pF, as explicitly stated in the Switching Characteristics table. This value reflects a typical capacitive load seen in board traces and TTL fan-out conditions. Performance remains valid across the full VCC (4.5–5.5 V) and temperature (0–70°C) range when loaded with 50 pF and driven by RL = 500 Ω.

Does the DM74AS04SJX have built-in input protection diodes?

Yes, the DM74AS04SJX includes input clamp diodes, evidenced by the VIK parameter (−1.2 V at −18 mA). These diodes protect against negative input transients and allow safe wired-OR bus configurations. However, external current-limiting resistors are still recommended when interfacing with voltages exceeding VCC or ground by more than ±0.5 V to prevent excessive forward conduction.

Can the DM74AS04SJX drive multiple standard TTL inputs directly?

Yes, the DM74AS04SJX can directly drive up to 20 standard TTL inputs per output, based on its IOL = 20 mA rating and standard TTL input current (IIL ≈ −1.6 mA). Its IOH = −2 mA also supports driving up to two TTL inputs in HIGH state. This fan-out capability is validated across the full operating temperature and supply range, making DM74AS04SJX suitable for dense logic interconnects without buffer amplification.