onsemi DM74AS00N

Overview

DM74AS00N from Fairchild Semiconductor is a quad 2-input NAND gate IC in a 14-lead PDIP package, operating at VCC = 4.5–5.5 V, with tPLH/tPHL propagation delays of 1–4.5 ns and guaranteed performance across 0°C to +70°C. It delivers IOL = 20 mA sink capability and VOH ≥ VCC − 2 V under IOH = −2 mA, used in TTL-compatible digital logic interfacing and control signal conditioning.

For engineers reviewing the DM74AS00N datasheet, pinout, applications, or equivalent options, key selection criteria include its Schottky TTL process, 50 pF load switching specs, pin-for-pin compatibility with standard TTL families, and verified operation across full industrial temperature and supply voltage ranges.

Technical Context

The DM74AS00N implements four independent 2-input NAND gates using oxide-isolated, ion-implanted Schottky TTL technology-enabling faster switching than standard LS-TTL while maintaining DC compatibility. Its input thresholds (VIL = 0.8 V, VIH = 2.0 V) and output drive (IOL = 20 mA, IOH = −2 mA) align with legacy TTL logic families.

Propagation delay is characterized at CL = 50 pF and RL = 500 Ω, with tPLH/tPHL specified from 1 ns (typical) to 4.5 ns (max), and ICC ranging from 2.2 mA (all outputs HIGH) to 17.4 mA (all outputs LOW) at VCC = 5.5 V.

Key Specifications

Pinout & Package

DM74AS00N is housed in a 14-lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" wide, with through-hole mounting and industry-standard lead pitch (0.100"). Thermal resistance θJA = 84.0°C/W enables stable operation at full rated load without forced airflow.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar NAND gate logic applications.

Compared with SN74AS00N, DM74AS00N offers identical performance and fit; versus 74VHC00N, DM74AS00N provides 2.5× higher output drive and ~2× faster propagation-critical for TTL-loaded or high-speed control paths.

Availability

DM74AS00N is available at Aetrix Electronics and suitable for industrial control logic, test equipment signal gating, legacy system repair, and power supply sequencing requiring stable component supply over extended production lifecycles.

Supply support for DM74AS00N 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 analog and discrete semiconductor manufacturer, acquired by ON Semiconductor in 2016; its legacy logic portfolio remains widely supported and distributed.

The DM74AS00N belongs to the 74AS (Advanced Schottky) TTL logic family, designed specifically for high-speed, low-noise digital control in industrial and instrumentation systems where legacy TTL compatibility and predictable timing are essential.

FAQ

What is the maximum operating temperature range for DM74AS00N?

The DM74AS00N is rated for operation from 0°C to +70°C ambient temperature. This industrial-grade range is fully guaranteed for all electrical parameters including propagation delay, output drive, and input thresholds. The device's thermal resistance (θJA = 84.0°C/W) allows it to sustain this range under typical PCB copper and airflow conditions without derating. DM74AS00N maintains specification compliance across the entire range without requiring external thermal management.

Is DM74AS00N pin-compatible with older TTL NAND gate variants?

Yes, DM74AS00N is explicitly specified as functionally and pin-for-pin compatible with 74S00, 74LS00, and 74ALS00 devices. All four NAND gates occupy identical positions on the 14-pin PDIP layout, with matching VCC (pin 14), GND (pin 7), and I/O assignments. This compatibility enables direct replacement in legacy designs without modifications to schematics or PCB footprints, preserving signal integrity and timing behavior.

What load capacitance is used to specify DM74AS00N switching characteristics?

DM74AS00N switching characteristics-including tPLH and tPHL-are specified at CL = 50 pF, with RL = 500 Ω, across the full recommended operating range. This reflects typical board-level loading from trace capacitance plus input capacitance of downstream TTL gates. The 50 pF condition ensures real-world applicability in dense digital logic assemblies and validates timing margins under realistic interconnect conditions for DM74AS00N.

Can DM74AS00N drive standard TTL inputs directly?

Yes, DM74AS00N can directly drive standard TTL inputs: its IOL = 20 mA sink current exceeds the 1.6 mA worst-case input requirement of a 74LS gate, and its VOH ≥ VCC − 2 V meets the 2.7 V minimum high-level threshold for TTL. With VIH = 2.0 V and VIL = 0.8 V, DM74AS00N maintains full noise margin when interfacing with legacy TTL loads-no level-shifting circuitry is needed for DM74AS00N in mixed-family systems.

Does DM74AS00N require external decoupling capacitors?

Yes, DM74AS00N requires a 0.1 µF ceramic decoupling capacitor placed as close as possible to pins 14 (VCC) and 7 (GND). This mitigates high-frequency supply transients caused by simultaneous gate switching, especially critical given its sub-5 ns propagation delays. Without proper decoupling, DM74AS00N may exhibit output instability, increased jitter, or false triggering-particularly in multi-gate or high-density logic implementations.