onsemi DM74ALS37AMX

Overview

DM74ALS37AMX from Fairchild Semiconductor is a quadruple 2-input NAND buffer IC in SOIC-14 package, operating at VCC = 4.5–5.5 V, with tPLH/tPHL ≤ 8 ns (CL = 50 pF), IOL = 24 mA sink capability, and guaranteed performance across 0°C to +70°C. It serves as a logic-level signal conditioner and fanout extender in TTL-compatible digital control subsystems.

For engineers reviewing the DM74ALS37AMX datasheet, pinout, applications, or equivalent options, key selection criteria include propagation delay under 50 pF load, output drive strength for driving multiple LS-TTL inputs, thermal resistance (θJA = 114°C/W), input clamp voltage (VIK = –1.5 V), and compatibility with legacy 74LS37-based designs.

Technical Context

The DM74ALS37AMX implements four independent NAND gates using advanced oxide-isolated, ion-implanted Schottky TTL process, enabling improved AC performance over standard LS37. Its logic function Y = AB is strictly combinatorial with no internal latching or timing elements.

It operates within a defined VCC range of 4.5–5.5 V and supports full industrial temperature range (0°C to +70°C) with guaranteed switching specs at 50 pF capacitive load. Input thresholds are VIH ≥ 2.0 V and VIL ≤ 0.8 V; output levels meet VOH ≥ 2.4 V (IOH = –2.6 mA) and VOL ≤ 0.4 V (IOL = 12 mA).

Key Specifications

Pinout & Package

Package: 14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" narrow body, package code M14A.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DM74ALS37AMX, SN74ALS37N offers identical logic and timing but requires through-hole layout, while MC74ALS37DG provides identical SOIC-14 form factor with potential lifecycle advantages and extended temperature qualification in select versions.

Availability

DM74ALS37AMX is available at Aetrix Electronics and suitable for industrial control logic, legacy system upgrade, and instrumentation front-end applications requiring stable component supply and long-term obsolescence management.

Supply support for DM74ALS37AMX 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 mixed-signal ICs, acquired by ON Semiconductor in 2016. It pioneered high-speed TTL and logic families in the 1980s.

The DM74ALS37AMX belongs to the 74ALS (Advanced Low-Power Schottky) logic family, designed for high-speed, low-power digital control in commercial-grade systems where LS-TTL compatibility and improved AC response were critical.

FAQ

What is the logic function implemented by DM74ALS37AMX?

The DM74ALS37AMX implements four independent 2-input NAND gates, each performing Y = AB. Each gate has two inputs and one output; the device contains no internal feedback, latches, or clocks. All logic is purely combinational, with truth table entries L/L→H, L/H→H, H/L→H, H/H→L confirmed across its full operating range.

Is DM74ALS37AMX pin-compatible with standard 74LS37 devices?

Yes, DM74ALS37AMX is functionally and pin-for-pin compatible with the 74LS37. Pin assignments, supply connections (VCC on pin 14, GND on pin 7), and input/output mapping match exactly. This allows direct substitution in existing LS-TTL designs without PCB modification, provided thermal and timing margins remain acceptable.

What is the maximum capacitive load DM74ALS37AMX can drive while meeting timing specs?

The DM74ALS37AMX switching characteristics-including tPLH ≤ 8 ns and tPHL ≤ 7 ns-are guaranteed only at CL = 50 pF. Driving heavier loads increases propagation delay nonlinearly and may violate setup/hold timing in synchronous systems. For loads > 50 pF, external buffering or layout optimization is recommended to maintain timing integrity.

Does DM74ALS37AMX support operation at 3.3 V supply?

No, DM74ALS37AMX is specified only for VCC = 4.5 V to 5.5 V. Operation below 4.5 V is not characterized and may result in undefined logic states, increased propagation delay, or failure to meet VOL/VOH thresholds. It is not compatible with 3.3 V logic families without level-shifting circuitry.

What is the thermal resistance (θJA) of DM74ALS37AMX in its SOIC-14 package?

The DM74ALS37AMX has a typical junction-to-ambient thermal resistance (θJA) of 114.0°C/W in the M14A SOIC-14 package. This value assumes standard JEDEC 2S2P test board conditions. Actual θJA in end-user PCBs depends on copper area, layer count, and airflow; derating is advised above +50°C ambient.