STMicroelectronics 74LVX139MTR

Overview

74LVX139MTR from STMicroelectronics is a low-voltage CMOS dual 2-to-4 decoder/demultiplexer with 5V-tolerant inputs, operating from 2V to 3.6V supply. It features 6.0ns typical propagation delay at 3.3V, ±4mA symmetrical output drive, and active-low enable inputs for gating or data routing in 3.3V logic systems.

For engineers reviewing the 74LVX139MTR datasheet, 74LVX139MTR pinout, 74LVX139MTR application, or 74LVX139MTR equivalent, key selection factors include 5V input tolerance, low-noise 0.3V typical VOLP, 2µA max ICC quiescent current, and pin/function compatibility with standard 74-series 139 devices.

Technical Context

This device implements two independent 2-to-4 decoders with active-low enables (1G, 2G), each accepting two address inputs (1A/1B, 2A/2B) and driving four active-low outputs (1Y0–1Y3, 2Y0–2Y3). All inputs tolerate 0–7V regardless of VCC, enabling robust 5V-to-3.3V interfacing.

It uses sub-micron C2MOS technology with built-in ESD protection (2kV HBM), power-down input protection, and balanced tPLH/tPHL delays. The logic diagram confirms non-inverting address decoding with inverting outputs, and truth table operation is guaranteed across 1.2V–3.6V VCC.

Key Specifications

Pinout & Package

SOP-16 package (SO-16, 150 mil width), compliant with JEDEC MS-012, with gull-wing leads and 1.27 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74LVC139AD and SN74LV139ADR, the 74LVX139MTR uniquely combines 5V input tolerance, SOP-16 pin compatibility with legacy 74139, and sub-2µA quiescent current - making it optimal for drop-in upgrades of industrial 3.3V controllers with mixed-voltage I/O.

Availability

74LVX139MTR is available at Aetrix Electronics and suitable for memory address decoding, peripheral select logic, bus multiplexing, and low-power sensor interface applications requiring stable component supply and long-term obsolescence management.

Supply support for 74LVX139MTR 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, specializing in automotive, industrial, and power management ICs with strong analog and mixed-signal design heritage.

The 74LVX series targets low-voltage, low-noise 3.3V logic interoperability - designed specifically to bridge legacy 5V systems and emerging energy-efficient embedded platforms while maintaining pin and functional compatibility.

FAQ

Can 74LVX139MTR operate with VCC = 1.8V?

No. The recommended operating VCC range is 2.0V to 3.6V per Table 5. At 1.8V, DC parameters like VIH/VIL and output drive are not guaranteed, and functionality may fail. Data retention is specified down to 1.2V, but active operation requires minimum 2.0V.

Is the 74LVX139MTR pinout identical to the 74HC139?

Yes - pin-for-pin compatible with standard 74HC139 in SO-16 package. Pin 1 (1G), pins 2–3 (1A/1B), pins 4–7 (1Y0–1Y3), pin 8 (GND), pin 16 (VCC), and corresponding Decoder 2 pins match exactly, enabling direct replacement without layout changes.

What is the maximum capacitive load this device can drive reliably?

The AC characteristics table specifies timing with CL = 15pF and 50pF loads. While not explicitly rated beyond 50pF, the ±4mA output drive suggests reliable operation up to ~60pF with acceptable delay increase - verified by tPLH/tPHL degradation curves in Figure 5 and 6 of the datasheet.

Does the device support hot insertion when VCC is unpowered?

Yes. Power-down protection on all inputs allows 0–7V signals even when VCC = 0V. This prevents back-current flow and latch-up, making it safe for hot-swap applications such as modular I/O cards where supply sequencing is uncontrolled.