Nexperia USA Inc. 74HC238D,653

Overview

74HC238D,653 from Nexperia is a 3-to-8 line decoder/demultiplexer in SO16 package, featuring three binary address inputs (A0–A2), eight active-HIGH mutually exclusive outputs (Y0–Y7), and three enable inputs (E1, E2 active LOW; E3 active HIGH) for parallel expansion to 1-of-32 decoding. It operates from 2.0 V to 6.0 V and supports memory chip select decoding in industrial microcontroller systems.

For engineers reviewing the 74HC238D,653 datasheet, 74HC238D,653 pinout, 74HC238D,653 application, or 74HC238D,653 equivalent, key selection considerations include enable logic configuration (E1/E2 LOW + E3 HIGH), propagation delay at 4.5 V (17 ns typ), output drive capability (±25 mA), CMOS-level input compatibility, and -40 °C to +125 °C temperature rating.

Technical Context

The device implements combinational logic decoding with strict mutual exclusivity: only one output goes LOW when all enables are satisfied and address inputs match its binary index. Its triple-enable architecture (two active-LOW, one active-HIGH) enables hierarchical cascading without external inversion.

Input clamp diodes allow safe interfacing to voltages exceeding VCC when used with current-limiting resistors. Static characteristics confirm VIH = 3.15 V min and VOL = 0.26 V max at 4.5 V/4 mA, ensuring robust noise immunity and TTL-compatible output levels for downstream CMOS loads.

Key Specifications

Pinout & Package

74HC238D,653 uses the SOT109-1 plastic small outline package (SO16), 16-pin, 3.9 mm body width, with standard 1.27 mm lead pitch and gull-wing leads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HC238D,653, the 74HCT238D,653 offers lower input threshold compatibility at the cost of marginally higher supply current, while SN74HC238N trades surface-mount thermal performance for mechanical serviceability in non-volume production environments.

Availability

74HC238D,653 is available at Aetrix Electronics and suitable for memory chip select decoding, industrial I/O expansion, programmable logic interfaces, and test equipment signal routing requiring stable component supply across extended temperature ranges.

Supply support for 74HC238D,653 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 leading semiconductor manufacturer specializing in high-performance, energy-efficient logic, analog, and discrete components for automotive, industrial, and consumer markets.

The 74HC238 belongs to Nexperia's HC logic family, designed for low-power, high-noise-immunity digital interfacing in space-constrained industrial control and instrumentation systems.

FAQ

What is the maximum clock frequency supported by the 74HC238D,653?

The 74HC238D,653 is a combinational logic device with no internal clock; its speed is defined by propagation delay. At VCC = 4.5 V, tpd is 17 ns typical, supporting effective address switching up to ~58 MHz in ideal conditions. Real-world system timing depends on input slew rate, load capacitance, and PCB routing.

Can the 74HC238D,653 be used as a demultiplexer, and how is it configured?

Yes: configure E1 (or E2) as the data input (driven HIGH/LOW), A0–A2 as the 3-bit channel address, and the remaining two enables (E2/E3 or E1/E3) as global strobes. When strobes are asserted, the data appears on the selected Y output; all other outputs remain LOW. This requires no external logic.

Does the 74HC238D,653 support mixed-voltage operation between input and output sides?

No - it is a single-supply device: all inputs and outputs reference the same VCC and GND. Input voltage limits are 0 V to VCC, and outputs swing rail-to-rail within that range. For level translation, external buffers or dedicated level shifters are required.

Is the thermal pad on the DHVQFN variant (74HC238BQ) electrically connected?

The exposed thermal pad on SOT763-1 (74HC238BQ) is not electrically connected - it has no internal bond. Per Nexperia documentation, it may be left floating or connected to GND for thermal improvement, but must not be tied to any voltage rail. This does not apply to the SO16 74HC238D,653, which lacks a thermal pad.