Renesas 74HC139TELL-E

Overview

74HC139TELL-E from Renesas is a dual 2-to-4-line decoder/demultiplexer in TSSOP-16 package, operating from 2 V to 6 V supply, with 14 ns typical propagation delay (CL = 50 pF), active-low enable inputs (1G/2G), and four active-low outputs per section. It enables address decoding in microcontroller peripheral selection and memory-mapped I/O expansion.

For engineers reviewing the 74HC139TELL-E datasheet, 74HC139TELL-E pinout, 74HC139TELL-E application, or 74HC139TELL-E equivalent, this page delivers verified functional behavior, validated timing under load, package-specific thermal and layout constraints, and real-world substitution guidance for industrial control and embedded logic design.

Technical Context

The 74HC139TELL-E integrates two independent decoders, each accepting two binary select inputs (A/B) and one active-low enable (G) to drive four complementary-active-low outputs (Y0–Y3). Each decoder operates asynchronously with no internal latching or clocking.

Logic levels comply with high-speed CMOS thresholds: VIH ≥ 4.2 V (VCC = 6 V), VIL ≤ 1.8 V (VCC = 6 V); output drive capability supports ±5.2 mA sink/source at VCC = 6 V, enabling direct interface with LSTTL loads without level-shifting.

Key Specifications

Pinout & Package

TSSOP-16 package (PTSP00016JB-A / TTP-16DAV), 4.4 mm × 5.0 mm body, 0.65 mm pitch, Ni/Pd/Au plating, 0.05 g mass. Designed for fine-pitch PCB assembly with thermal pad compatibility and moisture sensitivity level (MSL) 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HC139TELL-E, SN74HC139DR offers wider temperature tolerance at the cost of slightly higher static current, while MC74HC139ADTR2G provides identical electrical performance with alternate packaging logistics-both require no schematic or layout changes but differ in qualification scope and procurement routing.

Availability

74HC139TELL-E is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, microcontroller peripheral selection, and memory-mapped device interface requiring stable component supply, long-term manufacturability, and RoHS-compliant TSSOP packaging.

Supply support for 74HC139TELL-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 is a Japanese semiconductor manufacturer specializing in microcontrollers, analog, and logic devices for industrial, automotive, and infrastructure markets.

The HD74HC139 product line delivers standardized high-speed CMOS logic building blocks optimized for reliability in harsh-environment embedded systems, with emphasis on wide-voltage operation and low-power static behavior.

FAQ

What is the maximum clock frequency supported by the 74HC139TELL-E for address decoding?

The 74HC139TELL-E is not a clocked device-it has no internal clock and operates asynchronously. Its usable signal frequency depends on propagation delay and system timing margins. With 14 ns typical tPLH/tPHL at VCC = 4.5 V and CL = 50 pF, it reliably supports address bus transitions up to approximately 35 MHz in well-decoupled layouts, assuming adequate setup/hold times for downstream latches.

Can the 74HC139TELL-E drive LEDs directly without current-limiting resistors?

No. While the 74HC139TELL-E can sink up to 5.2 mA per output at VCC = 6 V, driving LEDs directly risks exceeding absolute maximum ratings and causing premature wear. Each output must include a series resistor sized to limit current to ≤4 mA (e.g., 220 Ω for red LED at 5 V), ensuring safe operation within VOH/VOL specifications and thermal limits.

Is the 74HC139TELL-E pin-compatible with the older HD74LS139P DIP version?

No. The 74HC139TELL-E uses TSSOP-16 (0.65 mm pitch, 4.4 × 5.0 mm), while HD74LS139P uses DIP-16 (2.54 mm pitch, 6.3 × 19.2 mm). Pin numbering and functions match (1G, 1A, 1B, 1Y0–1Y3, GND, VCC, etc.), but physical layout, soldering requirements, and thermal characteristics differ significantly-PCB redesign is required for replacement.

Does the 74HC139TELL-E support mixed-voltage operation between input and output sides?

No. The 74HC139TELL-E is a single-supply CMOS device: all inputs and outputs reference the same VCC and GND. It does not support level translation. Inputs must stay within 0–VCC, and outputs swing rail-to-rail. For mixed-voltage interfacing (e.g., 3.3 V MCU to 5 V peripherals), external level shifters or buffer ICs are required.

What is the recommended PCB layout practice for minimizing noise coupling on the 74HC139TELL-E?

Place a 100 nF X7R ceramic capacitor between VCC (Pin 16) and GND (Pin 8) within 3 mm of the package. Route GND connections with minimum loop area; avoid running sensitive analog traces near pins 1G–2B or Y0–Y3. Use solid ground plane beneath the TSSOP-16 footprint and isolate high-speed switching nodes from clock or RF sections using guard traces.