Renesas 74LS139FP-E

Overview

74LS139FP-E from Renesas Electronics is a dual 2-line-to-4-line decoder/demultiplexer in SOP-16 package, operating at 4.75–5.25 V supply, with propagation delays as low as 13 ns (t_PLH) and output drive capability of 8 mA sink current. It implements active-low enable logic for independent channel control and supports TTL-compatible input thresholds (V_IL ≤ 0.8 V, V_VIH ≥ 2.0 V), commonly used in address decoding for microcontroller peripheral selection.

For engineers reviewing the 74LS139FP-E datasheet, 74LS139FP-E pinout, 74LS139FP-E application, or 74LS139FP-E equivalent, key selection considerations include its dual-decoder architecture with separate active-low enables, guaranteed operation across –20°C to +75°C, SOP-16 JEITA footprint compatibility, and direct replacement suitability for legacy 74LS139-based designs requiring surface-mount assembly.

Technical Context

The 74LS139FP-E integrates two independent TTL-compatible decoders, each accepting two binary select inputs (A, B) and one active-low enable (G), producing four active-low decoded outputs (Y0–Y3). Each decoder operates asynchronously with no internal clock or state retention.

Its logic function follows standard truth table behavior: when G = L, outputs reflect 2-bit binary decode of A/B; when G = H, all outputs remain high regardless of A/B states. Input clamp voltage (V_IK = –1.5 V) and short-circuit output current (I_OS = –5 to –42 mA) are specified per JEDEC standards for LS-family robustness.

Key Specifications

Pinout & Package

SOP-16 package (JEITA code PRSP0016DH-B, Renesas abbreviation FP), 10.06 mm × 5.5 mm body, 1.27 mm lead pitch, Ni/Pd/Au-plated terminals.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual 2-to-4 decoder applications.

Compared with SN74LS139DR and 74HCT139PW, the 74LS139FP-E offers guaranteed JEITA SOP-16 mechanical compatibility, tighter propagation delay consistency, and native LS-family noise immunity-making it optimal for retrofitting legacy DIP-16 designs into surface-mount production without layout revision.

Availability

74LS139FP-E is available at Aetrix Electronics and suitable for microcontroller peripheral decoding, memory address selection, LED segment driver enable, and industrial I/O multiplexing requiring stable component supply and long-term obsolescence management.

Supply support for 74LS139FP-E 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

Renesas Electronics Corporation is a Japanese semiconductor manufacturer specializing in microcontrollers, analog, and legacy logic solutions, with global design and manufacturing infrastructure.

The HD74LS139 product line delivers industry-standard TTL-compatible dual decoders for address/data routing in industrial control, test equipment, and legacy system upgrades-designed specifically for reliability in commercial and industrial ambient conditions.

FAQ

What is the maximum operating temperature range for the 74LS139FP-E?

The 74LS139FP-E is rated for operation from –20°C to +75°C, as confirmed in the Recommended Operating Conditions table of the Renesas datasheet (Rev.2.00, Feb.2005). This range applies to commercial and industrial applications but excludes automotive or extended-temperature use cases. The 74LS139FP-E must not be operated outside these limits to ensure compliance with its specified electrical characteristics, including propagation delay and output drive capability.

Does the 74LS139FP-E support true demultiplexing functionality?

Yes, the 74LS139FP-E supports demultiplexing by using its active-low enable input (1G or 2G) as a data line: when A and B are held constant, applying a logic signal to G routes that signal to the selected Y output (e.g., G → Y0 when A=B=0). This behavior is explicitly documented in the device description and function table of the Renesas HD74LS139 datasheet, confirming the 74LS139FP-E's dual role as both decoder and 1-to-4 demultiplexer.

Is the 74LS139FP-E pin-compatible with through-hole 74LS139 variants?

No-the 74LS139FP-E uses SOP-16 (JEITA PRSP0016DH-B), while through-hole versions like HD74LS139P use DIP-16 (PRDP0016AE-B). Although both share identical pin numbering and signal assignments (1G, 1A, 1B, 1Y0–1Y3, GND, 2Y0–2Y3, 2B, 2A, 2G, V_CC), the 74LS139FP-E requires a different PCB footprint and reflow assembly process. Mechanical compatibility is limited to SOP-16 land patterns, not DIP-16 sockets or pads.

What is the typical supply current consumption of the 74LS139FP-E?

The typical supply current (I_CC) for the 74LS139FP-E is 6.8 mA at V_CC = 5.25 V with outputs enabled and open, as specified in the Electrical Characteristics table (Rev.2.00, p.3). This value reflects quiescent draw under active decode conditions and excludes transient peaks during switching. The 74LS139FP-E's LS-family design balances this current draw against its 13–38 ns propagation performance, distinguishing it from lower-power HCT or higher-speed AS variants.

Can the 74LS139FP-E drive LEDs directly?

The 74LS139FP-E outputs can sink up to 8 mA per Y line (I_OL = 8 mA), sufficient to drive small indicator LEDs with appropriate series resistors (e.g., ~390 Ω for 5 V supply and 10 mA target). However, its active-low outputs require common-anode LED configurations. The 74LS139FP-E is not intended for high-current loads or sustained continuous drive; thermal limits and output voltage drop (V_OL ≤ 0.5 V at 8 mA) must be verified per application, as stated in the Absolute Maximum Ratings and Electrical Characteristics sections.