onsemi DM7406N

Overview

DM7406N from Fairchild Semiconductor is a hex inverting buffer IC with six independent open-collector outputs rated for up to 30V, operating at 4.75–5.25V supply, with 15 ns tPLH and 23 ns tPHL propagation delays at 5V and 25°C. It serves as a level-shifting logic interface in industrial control I/O modules.

For engineers reviewing the DM7406N datasheet, pinout, applications, or equivalent options, key selection criteria include its 30V output voltage rating, 40mA sink capability per output, open-collector topology requiring external pull-up resistors, and compatibility with TTL/CMOS input logic levels.

Technical Context

The DM7406N implements six identical inverting buffer stages, each with an open-collector NPN output stage enabling wired-AND logic and high-voltage interfacing beyond standard 5V rails. Its input thresholds (VIH = 2.0V min, VIL = 0.8V max) ensure robust TTL compatibility.

Electrical behavior is defined under recommended conditions: VCC = 4.75–5.25V, TA = 0–70°C. Output voltage swing reaches up to 30V when off, while sinking up to 40mA per channel at VOL ≤ 0.7V (IOL = 16mA) or ≤ 0.4V (IOL = 40mA).

Key Specifications

Pinout & Package

DM7406N is housed in a 14-lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" wide, with through-hole mounting and standard 0.1" pin pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN7406N and MC74F06N, the DM7406N offers proven industrial reliability at standard speed and power, making it optimal for cost-sensitive, thermally stable 5V control interfaces where exact pin-and-function equivalence is required.

Availability

DM7406N is available at Aetrix Electronics and suitable for industrial PLC I/O modules, legacy system bus interfaces, and LED matrix drivers requiring stable component supply and long-term obsolescence management.

Supply support for DM7406N 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 DM7406N belongs to Fairchild's 7400-series TTL-compatible logic family, designed specifically for robust level translation, high-voltage interfacing, and wired-logic applications in industrial control and instrumentation.

FAQ

What is the maximum output voltage rating for DM7406N?

The DM7406N features open-collector outputs rated for up to 30V. This allows the device to switch loads referenced to voltages significantly higher than its 5V supply rail-such as 12V or 24V industrial sensors or actuators-without external level-shifting circuitry. The 30V rating is absolute maximum; sustained operation should remain within recommended conditions specified in the datasheet.

Does DM7406N require external pull-up resistors on its outputs?

Yes, DM7406N requires external pull-up resistors on all six open-collector outputs to establish a valid HIGH logic state. Without them, outputs float when inactive. Pull-up value depends on load current, speed requirements, and supply voltage-for example, a 10kΩ resistor to 5V yields ~0.5mA static current and supports moderate switching speeds.

Can DM7406N be used as a level shifter between 3.3V and 5V logic?

No-DM7406N inputs are TTL-compatible (VIH ≥ 2.0V), but they are not 3.3V-tolerant in the modern sense; applying 3.3V to an input may result in marginal or unreliable HIGH detection depending on noise margin and temperature. For 3.3V-to-5V translation, a dedicated level shifter or buffer with guaranteed 3.3V VIH is recommended instead of DM7406N.

What is the supply current consumption of DM7406N under typical operation?

DM7406N draws ICCH = 30–48 mA when all outputs are HIGH (open, no load), and ICCL = 27–51 mA when all outputs are LOW (sinking current). Actual current depends on number of active outputs and load conditions. At idle (all outputs open), supply current is dominated by ICCH and remains within this range.

Is DM7406N RoHS compliant?

Original DM7406N devices were manufactured prior to RoHS enforcement and are not RoHS compliant. However, modern re-manufactured or drop-in replacements-such as SN7406N from TI or ON Semiconductor's equivalent-offer RoHS-compliant versions in the same PDIP package. Always verify compliance status with current lot documentation when ordering DM7406N.