onsemi DM7406M

Overview

DM7406M from Fairchild Semiconductor is a hex inverting buffer IC with six independent open-collector outputs rated for up to 30V, designed for level translation and wired-OR logic interfacing in 5V TTL systems. It operates across 0°C to +70°C, supports 40mA sink current per output, and requires external pull-up resistors for HIGH-level operation.

For engineers reviewing the DM7406M datasheet, pinout, applications, or equivalent options, key selection considerations include its 30V output voltage rating, 40mA IOL capability, open-collector architecture, and SOIC-14 package compatibility with legacy 7400-series logic designs.

Technical Context

The DM7406M implements six identical inverting buffer stages, each with an open-collector NPN output stage capable of sinking up to 40mA at VCC = 5V. Its logic inversion function (Y = A̅) is defined by standard TTL input thresholds: VIH ≥ 2.0V and VIL ≤ 0.8V.

It operates within a 4.75–5.25V supply range and delivers propagation delays of tPLH ≤ 15ns and tPHL ≤ 23ns under CL = 15pF and RL = 110Ω conditions. Output voltage tolerance extends to 30V, enabling direct interface with higher-voltage peripherals without level-shifting circuitry.

Key Specifications

Pinout & Package

DM7406M is housed in a 14-lead SOIC package (JEDEC MS-012, 0.150" narrow body), designated Package Number M14A.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN7406N and 74LVX06M, the DM7406M uniquely combines SOIC-14 packaging, 30V output tolerance, and 40mA sink current - making it the only option among the three suitable for mixed-voltage industrial control interfaces requiring surface-mount assembly.

Availability

DM7406M is available at Aetrix Electronics and suitable for industrial control panels, LED driver interfaces, legacy TTL system expansion, and wired-OR bus interfaces requiring stable component supply and long-term obsolescence management.

Supply support for DM7406M 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 deployed in industrial and automotive systems.

The DM7406M belongs to Fairchild's 7400-series TTL-compatible logic family, engineered specifically for robust level translation and high-voltage interfacing in commercial-grade industrial control applications.

FAQ

What is the maximum output voltage rating of the DM7406M?

The DM7406M features open-collector outputs rated for up to 30V. This allows the device to safely interface with higher-voltage loads such as 12V or 24V relays, lamps, or sensors without external protection components. The 30V rating applies when the output is in the OFF (HIGH-impedance) state and no current is flowing - critical for ensuring safe operation in mixed-voltage systems where the DM7406M serves as a level-shifting buffer.

Does the DM7406M require external pull-up resistors?

Yes, the DM7406M requires external pull-up resistors on all six open-collector outputs to establish a valid HIGH logic level. Since the outputs lack internal pull-ups, connecting each Y pin to a positive supply rail (e.g., 5V, 12V, or 24V) via a resistor is mandatory for proper logic operation. The value depends on load current and rise time requirements - typical values range from 1kΩ to 10kΩ based on the target voltage and fan-out.

Can the DM7406M operate from a 3.3V supply?

No, the DM7406M is specified only for 4.75V to 5.25V operation and is not guaranteed to function correctly at 3.3V. Its TTL-compatible input thresholds (VIH ≥ 2.0V, VIL ≤ 0.8V) and internal transistor biasing assume a 5V supply. Attempting to power the DM7406M from 3.3V may result in marginal or non-functional behavior - use 74LVX06 or similar 3.3V logic families instead for low-voltage designs.

What is the propagation delay of the DM7406M at 5V?

The DM7406M exhibits a maximum propagation delay of 15ns for LOW-to-HIGH transitions (tPLH) and 23ns for HIGH-to-LOW transitions (tPHL), measured at VCC = 5V, TA = 25°C, CL = 15pF, and RL = 110Ω. These values reflect worst-case performance under standard test conditions and support reliable timing in medium-speed digital control circuits such as PLC scan cycles or sensor polling loops using the DM7406M.

Is the DM7406M pin-compatible with other 7406 variants?

Yes, the DM7406M is pin-compatible with industry-standard 7406 devices in the same SOIC-14 package, including the SN7406D and MC7406. All share identical pin assignments: inputs on odd-numbered pins (1,3,5,9,11,13), outputs on even-numbered pins (2,4,6,10,12,14), plus VCC (pin 14) and GND (pin 7). This ensures drop-in replacement capability in existing SOIC-14 layouts designed for 7406 logic.