Nexperia USA Inc. 74HCT139DB-Q100J

Overview

74HCT139DB-Q100 from Nexperia is an automotive-qualified dual 2-to-4 line decoder/demultiplexer with TTL-compatible inputs, active-LOW outputs, and AEC-Q100 Grade 1 qualification (−40 °C to +125 °C). It features two independent decoders, each with address inputs (A0/A1), enable (nE), and four mutually exclusive active-LOW outputs (nY0–nY3), used in memory decoding and data routing within automotive body control modules.

For engineers reviewing the 74HCT139DB-Q100 datasheet, 74HCT139DB-Q100 pinout, 74HCT139DB-Q100 application, or 74HCT139DB-Q100 equivalent, key selection criteria include TTL-level input compatibility, propagation delay ≤51 ns at VCC = 4.5 V, SO16 package footprint, −40 °C to +125 °C operation, and AEC-Q100 compliance for under-hood ECUs.

Technical Context

This device implements two independent 2-to-4 binary decoders, each accepting two address bits and one active-LOW enable signal to drive four active-LOW outputs. All outputs are mutually exclusive: only one output per decoder is LOW for any valid input combination when enabled.

Input clamping diodes allow safe interfacing to voltages exceeding VCC using current-limiting resistors. The TTL-input variant (74HCT) ensures compatibility with legacy 5 V logic families while maintaining CMOS power efficiency and noise immunity.

Key Specifications

Pinout & Package

74HCT139DB-Q100 is housed in a 16-pin SSOP (Shrink Small Outline Package) with 0.65 mm lead pitch, body width 5.3 mm, and JEDEC MO-153 compliant outline (SOT338-1). This compact surface-mount package supports high-density PCB layouts in space-constrained automotive modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HCT139D-Q100, the DB variant offers higher board density via SSOP; versus SN74HCT139QPWRQ1, it delivers tighter propagation delay consistency and superior thermal derating above 90 °C - critical for under-hood ECU reliability.

Availability

74HCT139DB-Q100 is available at Aetrix Electronics and suitable for automotive body control modules, instrument cluster electronics, power distribution units, and ADAS camera interface systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HCT139DB-Q100 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

Nexperia is a global semiconductor expert delivering high-performance, reliable logic, discrete, and MOSFET solutions optimized for automotive, industrial, and consumer applications.

The 74HCT139-Q100 series belongs to Nexperia's automotive-qualified logic portfolio, designed specifically for robust, low-power decoding and demultiplexing in harsh-temperature electronic control units.

FAQ

What is the maximum clock frequency supported by 74HCT139DB-Q100?

The 74HCT139DB-Q100 is not a clocked sequential device - it is combinational logic with no internal clock. Its usable switching rate depends on propagation delay (≤51 ns) and system-level timing margins. For reliable operation, input address changes should be stable for ≥55 ns before and after enable assertion to avoid output glitches.

Can 74HCT139DB-Q100 drive LEDs directly?

Yes - each active-LOW output can sink up to 4 mA while maintaining VOL ≤ 0.4 V at VCC = 4.5 V, sufficient to illuminate low-current indicator LEDs (e.g., 2 mA @ 1.8 V forward voltage) with a series resistor. For higher-brightness or multi-LED loads, external buffer transistors are recommended.

Is 74HCT139DB-Q100 compatible with 3.3 V microcontrollers?

No - its TTL-compatible inputs require VIH ≥ 2.0 V and VIL ≤ 0.8 V, but it is specified only for VCC = 4.5–5.5 V operation. Driving it from a 3.3 V MCU requires level translation; for native 3.3 V systems, consider the 74LVC139A-Q100 instead.

How does the enable input function in demultiplexer mode?

When used as a 1-to-4 demultiplexer, the nE pin serves as the data input, while nA0/nA1 act as address selectors. With nE LOW, the selected output (e.g., nY2 for A1A0 = 10) goes LOW; all others remain HIGH. This provides true 1:4 signal routing without additional logic.