onsemi DM74ALS1005N

Overview

DM74ALS1005N from Fairchild Semiconductor is a hex inverting driver IC with six independent open-collector outputs, designed for TTL-level logic inversion and wired-OR interfacing. It operates at VCC = 4.5–5.5 V, delivers IOL = 24 mA per output, supports tPLH/tPHL ≤ 30/10 ns (CL = 50 pF), and is rated for 0°C to +70°C industrial temperature range - commonly used in bus buffering and level translation in legacy digital control systems.

For engineers reviewing the DM74ALS1005N datasheet, pinout, applications, or equivalent options, key selection considerations include open-collector drive capability, guaranteed AC performance across full VCC/temperature range, compatibility with Schottky TTL logic families, and PDIP-14 package suitability for through-hole prototyping and industrial backplane interfaces.

Technical Context

This device implements six identical inverting buffer stages, each with an open-collector NPN output stage requiring external pull-up resistors. Its oxide-isolated, ion-implanted Schottky TTL process ensures stable switching at 50 pF load with propagation delays specified from 2 ns (tPHL, typical) to 30 ns (tPLH, max).

All inputs meet standard TTL voltage thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V), and outputs support sink currents up to 24 mA while maintaining VOL ≤ 0.5 V. The device draws ICC = 0.9–3 mA (outputs HIGH) or 7–12 mA (outputs LOW) under recommended operating conditions.

Key Specifications

Pinout & Package

DM74ALS1005N is housed in a 14-lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" wide, with standard through-hole mounting and 0.100" lead pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ALS05N and MC74ALS05N, the DM74ALS1005N offers tighter tPLH timing (30 ns vs. 35 ns) and identical thermal performance in PDIP-14, making it optimal for timing-critical industrial bus interfaces where consistent propagation delay is prioritized over minor cost savings.

Availability

DM74ALS1005N is available at Aetrix Electronics and suitable for industrial control bus interface, legacy system level translation, and LED array driver applications requiring stable component supply and long-lifecycle availability.

Supply support for DM74ALS1005N 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 leading US-based analog and discrete semiconductor manufacturer, acquired by ON Semiconductor in 2016; known for high-reliability TTL, CMOS, and power products.

The DM74ALS1005N belongs to the advanced low-power Schottky (ALS) logic family, engineered specifically for high-speed, low-power digital interfacing in industrial and computing systems where pin compatibility and timing consistency across temperature/voltage were critical.

FAQ

What is the maximum sink current per output of the DM74ALS1005N?

The DM74ALS1005N supports a maximum low-level output current (IOL) of 24 mA per channel, tested under VCC = 4.5 V and VOL ≤ 0.5 V. This rating allows direct driving of multiple TTL inputs or indicator LEDs without external amplification. Exceeding this current risks violating VOL specifications or degrading long-term reliability. The DM74ALS1005N datasheet confirms this value in the Electrical Characteristics table under "LOW Level Output Current."

Does the DM74ALS1005N require external pull-up resistors on its outputs?

Yes, the DM74ALS1005N features open-collector outputs and requires external pull-up resistors to establish a valid HIGH logic level. Without them, outputs remain floating when inactive. Typical values range from 1 kΩ to 10 kΩ depending on bus capacitance and speed requirements. This design enables wired-OR functionality and voltage-level flexibility - a defining characteristic of the DM74ALS1005N.

Is the DM74ALS1005N pin-compatible with other hex inverter families?

Yes, the DM74ALS1005N is functionally and pin-for-pin compatible with 74S05, 74LS05, and 74ALS05 devices in the same 14-pin PDIP package. Input/output assignments and power pin locations match exactly. This compatibility allows seamless upgrades in legacy designs - the DM74ALS1005N retains identical pinout while delivering improved AC performance and lower power consumption.

What is the operating temperature range of the DM74ALS1005N?

The DM74ALS1005N is rated for operation from 0°C to +70°C (free-air temperature), meeting commercial and industrial ambient requirements. This range is explicitly defined in the Recommended Operating Conditions table of the official datasheet. Operation outside this range may result in parametric deviation or functional failure; the DM74ALS1005N is not qualified for extended temperature or automotive use.

Can the DM74ALS1005N be used with 3.3 V logic inputs?

No, the DM74ALS1005N is a 5 V TTL-family device with VIH = 2.0 V minimum and VIL = 0.8 V maximum - it does not guarantee recognition of 3.3 V logic HIGH levels, which typically swing to only ~3.3 V. While some 3.3 V outputs may exceed VIH marginally, interoperability is not assured. For mixed-voltage systems, level-shifting circuitry or a 3.3 V–compatible alternative should be used instead of relying on the DM74ALS1005N alone.