NXP Semiconductors N74F139D,602

Overview

N74F139D,602 from NXP Semiconductors (formerly Philips) is a dual 1-of-4 decoder/demultiplexer IC in 16-pin SO package, operating at 5 V ±10%, with 5.3 ns typical propagation delay, 13 mA typical supply current, and active-Low outputs. It implements two independent decoders for address decoding in TTL-compatible digital systems such as memory selection and peripheral interface logic.

For engineers reviewing the N74F139D,602 datasheet, N74F139D,602 pinout, N74F139D,602 application, or N74F139D,602 equivalent, key selection criteria include dual-decoder independence, active-Low enable/data routing capability, guaranteed operation across 0°C to +70°C, TTL-level input thresholds (V_IL = 0.8 V, V_IH = 2.0 V), and SO16 mechanical compatibility with legacy 74F footprint layouts.

Technical Context

The N74F139D,602 integrates two fully isolated 1-of-4 decoders, each with binary-addressed inputs (A0n, A1n), active-Low enable (En), and four mutually exclusive active-Low outputs (Q0n–Q3n). No shared internal logic exists between decoder 'a' and decoder 'b' - enabling concurrent, independent decoding paths.

Each decoder supports demultiplexing via its Enable pin: when En is Low, the selected output mirrors the data state; when High, all outputs are forced High. This dual functionality is implemented using standard TTL-compatible bipolar transistor-transistor logic (BTL), not CMOS or ECL, ensuring direct interoperability with 74F-series logic families.

Key Specifications

Pinout & Package

Package: 16-pin plastic small outline (SO16), SOT109-1, 3.9 mm body width, gull-wing leads, JEDEC MS-012 compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual 1-of-4 decoder/demultiplexer applications.

Compared with SN74F139N, N74F139D,602 offers superior thermal performance and PCB space efficiency in SMT production; compared with 74ACT139M, it provides guaranteed TTL-level interoperability without level translation but consumes higher quiescent current.

Availability

N74F139D,602 is available at Aetrix Electronics and suitable for memory address decoding, peripheral select logic, LED segment driver control, and industrial I/O multiplexing requiring stable component supply and long-term obsolescence management.

Supply support for N74F139D,602 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

NXP Semiconductors, headquartered in Eindhoven, Netherlands, is a global semiconductor leader delivering high-performance analog, logic, and interface solutions for automotive, industrial, and communication markets.

The 74F logic family - including N74F139D,602 - was engineered for high-speed TTL-compatible digital systems requiring sub-10 ns propagation delays and robust noise margins in commercial-temperature environments.

FAQ

What is the maximum output sink current rating for each Qn pin on the N74F139D,602?

Each Qn output on the N74F139D,602 is rated for 20 mA sink current under recommended operating conditions (I_OL = 20 mA). This value is specified at V_CC = 5.5 V and T_amb = +70°C, and applies individually per output - simultaneous sinking on multiple outputs requires derating based on total package power dissipation. The N74F139D,602 datasheet confirms this limit in the DC Electrical Characteristics table.

Can the N74F139D,602 operate reliably at 4.5 V supply voltage?

Yes, the N74F139D,602 is fully specified to operate at 4.5 V minimum supply voltage per the Recommended Operating Conditions table. At V_CC = 4.5 V, propagation delay increases to 7.0 ns max (vs. 5.3 ns typ at 5.0 V), and output voltage margins remain compliant: V_OH ≥ 2.5 V and V_OL ≤ 0.5 V. The N74F139D,602 maintains full functionality across the entire 4.5–5.5 V range.

Is the N74F139D,602 pin-compatible with the SN74F139N?

Yes, the N74F139D,602 and SN74F139N share identical pin assignments, signal definitions, and electrical specifications - differing only in package type (SO16 vs. DIP16). Both use SOT109-1 and SOT38-4 footprints respectively, and the N74F139D,602 pinout matches the SN74F139N exactly per the Philips IC15 Data Handbook. No PCB redesign is needed when migrating from DIP to SO.

Does the N74F139D,602 support demultiplexing functionality, and how is it implemented?

Yes, the N74F139D,602 supports demultiplexing via its active-Low Enable (En) inputs. When En is Low, the selected Qn output follows the inverse of the address state; when En is High, all Qn outputs go High. This allows the En pin to serve as the data input, with A0/A1 selecting the output channel - a true 1-to-4 demux. The N74F139D,602 datasheet explicitly defines this behavior in the Function Table and Description sections.

What is the input loading specification for address pins A0a and A1a on the N74F139D,602?

The N74F139D,602 specifies 1.0 FAST unit load for A0a and A1a inputs, defined as 20 µA High-state current and 0.6 mA Low-state current. This matches standard 74F-series input loading, ensuring predictable fan-out behavior when driven by other 74F devices. The value is confirmed in the Input and Output Loading and Fan-Out Table of the Philips product specification for N74F139D,602.