Nexperia USA Inc. 74HCT4514D,653

Overview

74HCT4514D,653 from Nexperia is a 4-to-16 line decoder/demultiplexer with input latches, implementing binary-to-one-hot decoding and data storage in a single TSSOP24 package. It features four address inputs (A0–A3), latch enable (LE) and active-low enable (E), 16 active-HIGH outputs (Q0–Q15), TTL-compatible input thresholds (VIH = 2.0 V min at VCC = 4.5–5.5 V), and operates from −40 °C to +125 °C. It is used in hexadecimal address decoding for microcontroller peripheral selection.

For engineers reviewing the 74HCT4514D,653 datasheet, 74HCT4514D,653 pinout, 74HCT4514D,653 application, or 74HCT4514D,653 equivalent, key selection criteria include latch-controlled output stability, TTL-level input compatibility, propagation delay (tPD = 30 ns max at VCC = 4.5 V), output drive strength (IO = ±4 mA), and TSSOP24 thermal performance under industrial temperature cycling.

Technical Context

The device integrates four independent D-type latches followed by a 4-bit binary decoder, enabling asynchronous address capture via LE and synchronous output activation via E. Its dual-control architecture decouples input sampling (on LE edge) from output enable timing (via E level), supporting glitch-free bus arbitration in multiplexed memory or I/O expansion systems.

Input clamping diodes allow safe interfacing to voltages exceeding VCC when used with current-limiting resistors. The 74HCT variant's reduced VIH/VIL thresholds (2.0 V/0.8 V) ensure robust logic-level translation between legacy TTL and modern CMOS subsystems without level shifters.

Key Specifications

Pinout & Package

TSSOP24 (SOT355-1) package: 24-pin plastic thin shrink small outline, 4.4 mm body width, 0.65 mm pitch, 1.1 mm max height - optimized for high-density PCB layouts and automated SMT assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 4-to-16 decoder/demultiplexer applications.

Compared with 74HC4514D,653 and SN74LS4514N, the 74HCT4514D,653 uniquely balances TTL input compatibility, industrial temperature resilience, and low dynamic power - making it optimal for new designs bridging legacy and modern logic families in harsh environments.

Availability

74HCT4514D,653 is available at Aetrix Electronics and suitable for microcontroller peripheral decoding, hexadecimal display multiplexing, programmable logic address mapping, and industrial sensor multiplexing requiring stable component supply across extended temperature ranges.

Supply support for 74HCT4514D,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 global semiconductor expert delivering high-performance logic, analog, and MOSFET solutions with focus on efficiency, reliability, and sustainability - headquartered in Nijmegen, Netherlands.

The 74HCT4514 belongs to Nexperia's industry-standard logic family designed specifically for robust level translation and address decoding in industrial, automotive, and computing applications where interoperability with legacy TTL systems is essential.

FAQ

What is the maximum clock frequency supported by the 74HCT4514D,653 for address decoding?

The device does not operate on a clock signal but responds to edge- and level-sensitive control inputs. With a maximum propagation delay of 30 ns (VCC = 4.5 V), it supports address decode cycles up to approximately 16 MHz in systems where LE and E timing margins permit. Real-world throughput depends on setup/hold times (tsu = 9 ns, th = −3 ns) and bus stabilization requirements.

Can the 74HCT4514D,653 drive LEDs directly without current-limiting resistors?

No. While its outputs source/sink ±4 mA at VOH/VOL specifications, direct LED connection risks exceeding absolute maximum ratings and causing forward voltage mismatch. A series resistor (e.g., 330 Ω for 5 V supply and 2 V LED drop) is mandatory to limit current to ≤4 mA and ensure VOL ≤ 0.26 V under load.

How does the latch enable (LE) function interact with the enable input (E)?

LE and E operate independently: LE controls when A0–A3 values are captured into internal latches (on rising edge), while E determines whether the latched value is reflected at the outputs (Qn = HIGH only when E = LOW). Outputs remain frozen at prior state when E = HIGH, regardless of LE or A0–A3 activity - enabling safe address hold during bus contention.

Is the 74HCT4514D,653 qualified for automotive applications?

No. Although rated for −40 °C to +125 °C, this part is not AEC-Q100 qualified and lacks automotive-specific reliability testing, failure-in-time (FIT) data, or PPAP documentation. For automotive use, consult Nexperia's dedicated automotive-grade variants such as the 74HCT4514-Q100, which undergoes additional stress screening and qualification.