Texas Instruments SN74150N

Overview

SN74150N from Texas Instruments is a 16-input data selector/multiplexer with complementary W and Y outputs, TTL-compatible logic levels, 24-pin PDIP package, propagation delay of 25 ns (typical), and operating supply voltage of 4.75 V to 5.25 V. It enables high-reliability digital signal routing in legacy industrial control and test equipment.

For engineers reviewing the SN74150N datasheet, SN74150N pinout, SN74150N application, or SN74150N equivalent, this page delivers verified functional specifications, validated pin assignments, real-world use cases in deterministic logic systems, and confirmed drop-in alternatives for continuity design and obsolescence mitigation.

Technical Context

The SN74150N implements a single 16:1 multiplexer with active-low enable (G̅) and dual complementary outputs (Y and W). Its internal architecture uses cascaded 2-to-1 and 4-to-1 stages to route one of 16 data inputs (D0–D15) to Y based on four binary select lines (A, B, C, D).

It operates strictly within standard TTL voltage thresholds: input low ≤ 0.8 V, input high ≥ 2.0 V, output low ≤ 0.4 V (at I_OL = 16 mA), and output high ≥ 2.4 V (at I_OH = –0.4 mA). No internal latching or clocking is present - it is purely combinational.

Key Specifications

Pinout & Package

SN74150N uses a 24-pin plastic dual-in-line package (PDIP), JEDEC MS-010 compliant, with 0.300-inch body width and 0.100-inch lead pitch. Dimensions: 0.761 × 0.265 × 0.195 inches (19.3 × 6.7 × 5.0 mm).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16:1 multiplexer applications.

Compared with SN74LS150N and SN74S150N, the SN74150N occupies the mid-tier balance of speed, power, and compatibility - offering 25 ns delay at 80 mW, making it optimal for cost-sensitive, noise-immune commercial systems where LS speed is insufficient and S-series power is excessive.

Availability

SN74150N is available at Aetrix Electronics and suitable for industrial test fixtures, legacy computer maintenance, and avionics signal routing requiring stable component supply across long-lifecycle programs.

Supply support for SN74150N 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

Texas Instruments is a U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and logic ICs with broad industrial and aerospace heritage.

The SN74150N belongs to TI's original 7400-series TTL logic family, designed in the 1970s for robust, high-noise-margin digital control in mainframe peripherals, instrumentation, and defense systems.

FAQ

What is the maximum clock rate supported by SN74150N?

The SN74150N is a purely combinational device with no internal clock. Its usable switching rate depends on propagation delay (25 ns typical) and system-level setup/hold timing. In practice, SN74150N supports reliable operation up to approximately 20 MHz in well-designed TTL backplanes, assuming clean edges and proper termination. Always validate timing margins using worst-case 30 ns max delay in critical paths.

Does SN74150N support 3.3 V logic interfaces?

No, SN74150N is a standard TTL device requiring 4.75 V to 5.25 V supply and exhibiting TTL input thresholds (V_IL ≤ 0.8 V, V_IH ≥ 2.0 V). It is not 3.3 V tolerant. Direct connection to 3.3 V logic may cause undefined behavior or damage. Level translation (e.g., SN74LVC1T45) is required for mixed-voltage systems involving SN74150N.

Can SN74150N be used in place of SN74151?

No - SN74150N is a 16-input (16:1) multiplexer with 24 pins, while SN74151 is an 8-input (8:1) multiplexer in a 16-pin package. They differ in pin count, select line count (4 vs. 3), input count, and output structure (complementary Y/W vs. single Y and W̅). Substitution would require PCB redesign and logic re-architecting; they are not functionally or physically interchangeable.

What is the purpose of the W output on SN74150N?

The W output on SN74150N is the logical complement of Y (W = Y̅) and is implemented as an open-collector output. This allows wired-AND configurations, direct interfacing with TTL inputs without pull-ups, and simplified generation of differential control signals. When Y is high, W is pulled low externally; when Y is low, W floats unless pulled high - enabling flexible active-low signaling schemes in legacy systems.

Is SN74150N RoHS compliant?

Yes, SN74150N is RoHS compliant and Pb-Free (RoHS), with CU NIPDAU lead finish. It meets EU Directive 2011/65/EU requirements, containing ≤0.1% lead by weight in homogeneous materials. The "N" suffix denotes the PDIP package variant qualified under TI's green manufacturing program as of its production date.