Nexperia USA Inc. 74LV138BQ,115

Overview

74LV138BQ,115 from Nexperia is a 3-to-8 line inverting decoder/demultiplexer with three active-LOW enable inputs (E1, E2) and one active-HIGH enable input (E3), operating across 1.0 V to 5.5 V supply range. It delivers mutually exclusive active-LOW outputs (Y0–Y7), supports parallel expansion to 1-of-32 decoding, and functions as an 8-output demultiplexer. It is used in memory chip select decoding for microcontroller-based embedded systems requiring low-voltage logic interfacing.

For engineers reviewing the 74LV138BQ,115 datasheet, 74LV138BQ,115 pinout, 74LV138BQ,115 application, or 74LV138BQ,115 equivalent, this device is selected for precise address decoding in space-constrained industrial control modules, where thermal performance, wide VCC tolerance, and TTL-level compatibility are critical design requirements.

Technical Context

The 74LV138BQ implements standard binary decoding logic with strict mutual exclusivity: only one output goes LOW when all enables are satisfied (E1 = E2 = LOW, E3 = HIGH) and address inputs A0–A2 define the selected line. Its propagation delay ranges from 12 ns (VCC = 3.3 V, CL = 15 pF) to 55 ns (VCC = 2.0 V), ensuring timing predictability across voltage and temperature extremes.

Input clamping diodes allow safe interface to voltages exceeding VCC when used with current-limiting resistors. The device complies with JEDEC standards JESD8-7, JESD8-5, JESD8C, and JESD36, and meets HBM ESD >2000 V and CDM >1000 V per JS-001/JS-002.

Key Specifications

Pinout & Package

DHVQFN16 package (SOT763-1): 2.5 × 3.5 × 0.85 mm body, no leads, thermally enhanced exposed pad (terminal 1 index area), 16 terminals. Exposed pad is electrically unconnected unless tied to VCC or left floating per datasheet guidance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 3-to-8 decoder applications.

Compared with 74LVC138PW,118 and SN74HC138PWR, the 74LV138BQ,115 uniquely balances 1.0 V operability, +125 °C rating, and DHVQFN thermal performance - making it the only option for next-generation low-voltage industrial controllers requiring full automotive-grade temperature resilience.

Availability

74LV138BQ,115 is available at Aetrix Electronics and suitable for memory decoding, I/O expansion, automotive body control, and automated test equipment requiring stable component supply across extended temperature and low-voltage conditions.

Supply support for 74LV138BQ,115 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 focused on high-volume, high-reliability logic, discrete, and MOSFET solutions, with leadership in automotive-qualified components and energy-efficient packaging.

The 74LV logic family targets low-voltage embedded systems needing robust noise immunity, wide supply flexibility, and guaranteed operation down to 1.0 V - specifically engineered for battery-powered and mixed-rail industrial control applications.

FAQ

Can the 74LV138BQ,115 operate reliably at 1.2 V supply?

Yes. The device is fully specified and tested down to 1.0 V VCC, with guaranteed functionality including VIH/VIL thresholds, propagation delay, and output drive at 1.2 V. Static characteristics (e.g., VOH ≥ 0.9 V, VOL ≤ 0.3 V) and dynamic timing (tpd ≤ 75 ns) are validated across −40 °C to +125 °C at this voltage.

What is the function of the exposed thermal pad on the DHVQFN package?

The exposed pad (terminal 1 index area) is not electrically connected to any internal node. Per Nexperia's datasheet, it may be left floating or soldered to VCC - but must never be connected to GND or left un-soldered with solder paste residue. When tied to VCC, it improves thermal conduction and reduces junction-to-board thermal resistance by ~15 %.

How does the enable logic work for demultiplexer operation?

In demux mode, E3 serves as the data input (HIGH/LOW routed to selected output), while E1 and E2 act as strobe controls. When E1 and E2 are held LOW and E3 toggles, the state of E3 appears inverted on the selected Yx output (e.g., A0–A2 = 000 → Y0 = NOT E3). All unselected outputs remain HIGH regardless of E3 state.

Is the 74LV138BQ,115 qualified for automotive applications?

No. Although rated for −40 °C to +125 °C, the 74LV138BQ,115 is not AEC-Q100 qualified and lacks automotive-specific stress testing, failure analysis reporting, or PPAP documentation. It is intended for industrial and commercial applications; automotive use requires explicit validation by the end customer and carries no Nexperia warranty.