onsemi DM74ALS08M

Overview

DM74ALS08M from Fairchild Semiconductor is a quad 2-input AND gate IC in 14-lead SOIC (M14A) package, operating at VCC = 4.5–5.5 V, with propagation delays as low as 3 ns (tPHL) and 4 ns (tPLH), rated for 0°C to +70°C industrial temperature range, and delivering 8 mA sink current (IOL) - used in digital logic control and signal gating in embedded interface circuits.

For engineers reviewing the DM74ALS08M datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed AC performance over full VCC/temperature range, Schottky TTL-compatible logic levels, 50 pF load switching specs, and SOIC-14 footprint compatibility with legacy 74-series designs.

Technical Context

The DM74ALS08M implements four independent AND gates using advanced oxide-isolated, ion-implanted Schottky TTL process, ensuring compatibility with standard TTL input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) and output drive capability (IOH = −0.4 mA, IOL = 8 mA). It operates strictly within 4.5–5.5 V supply and requires no external biasing.

Its switching characteristics are fully specified at CL = 50 pF and RL = 500 Ω, with tPHL/tPLH bounded at 3–10 ns and 4–14 ns respectively across temperature and voltage extremes - enabling reliable use in synchronous logic interconnects and combinational glue logic.

Key Specifications

Pinout & Package

DM74ALS08M uses a 14-lead Small Outline Integrated Circuit (SOIC) package per JEDEC MS-012, 0.150" narrow body width, with thermal resistance θJA = 120°C/W. Pin numbering follows standard dual-in-line convention, viewed from top with notch/left index mark.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad 2-input AND gate applications.

Compared with SN74ALS08DR, DM74ALS08M offers identical logic behavior and timing but differs in thermal profile; versus 74VHC08M, it provides assured TTL interoperability and tighter propagation delay bounds at 5 V, making it preferable for legacy system upgrades where signal integrity and timing predictability are critical.

Availability

DM74ALS08M is available at Aetrix Electronics and suitable for industrial PLC input conditioning, digital panel meter interfaces, legacy test equipment signal routing, and automated test fixture handshaking requiring stable component supply and long-term obsolescence management.

Supply support for DM74ALS08M 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 designer of analog and mixed-signal semiconductors, acquired by ON Semiconductor in 2016; known for robust, industry-standard logic and power products.

The DM74ALS08M belongs to Fairchild's 74ALS (Advanced Low-Power Schottky) logic family, engineered for high-speed, low-power digital systems requiring TTL compatibility and guaranteed AC performance across commercial temperature ranges.

FAQ

What logic family does DM74ALS08M belong to, and how does it differ from standard 74LS?

DM74ALS08M belongs to the 74ALS (Advanced Low-Power Schottky) family. It improves upon 74LS with faster propagation delays (3–10 ns vs. 15–25 ns), lower power consumption (ICC ≈ 1.3–4 mA vs. 5–10 mA), and guaranteed switching performance at 50 pF load. The DM74ALS08M retains full pin and functional compatibility with 74LS08, allowing direct substitution in most designs without modification.

Is DM74ALS08M pin-compatible with other 74xx08 variants like 74S08 or 74F08?

Yes - DM74ALS08M is explicitly documented as functionally and pin-for-pin compatible with both 74S08 and 74LS08. Its input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V), output drive (IOL = 8 mA), and 14-pin SOIC footprint match these families. However, DM74ALS08M offers superior speed-power trade-offs and tighter AC specs than 74S08, and lower power than 74F08.

What is the maximum capacitive load DM74ALS08M can drive while maintaining guaranteed timing?

The DM74ALS08M switching characteristics are guaranteed specifically at CL = 50 pF, as stated in the datasheet's "Switching Characteristics" table. While it may operate with higher capacitance, timing parameters (tPLH/tPHL) exceed published max values beyond 50 pF. For reliable 3–14 ns propagation delays, keep total load capacitance at or below 50 pF per output when designing with DM74ALS08M.

Does DM74ALS08M support operation outside the 0°C to +70°C range?

No - DM74ALS08M is rated only for 0°C to +70°C free-air operating temperature, per its "Recommended Operating Conditions." Absolute maximum ratings extend to −65°C to +150°C for storage, but electrical specifications are not guaranteed outside the commercial temperature range. For extended temperature use, consider alternatives such as military-spec 54ALS08 or modern industrial-grade equivalents.

Can DM74ALS08M outputs directly drive LEDs or relays?

DM74ALS08M outputs can sink up to 8 mA (IOL) but source only −0.4 mA (IOH), making them suitable for sinking current to ground - e.g., driving common-anode LEDs with current-limiting resistors. Direct relay coil driving is not recommended due to inductive kickback risk and insufficient peak current; use an external transistor or dedicated driver stage when interfacing with DM74ALS08M in such applications.