Nexperia USA Inc. 74HCT373D,652

Overview

74HCT373D,652 from Nexperia is an octal D-type transparent latch with 3-state outputs, used for data latching and bus isolation in digital systems. It features TTL-compatible inputs (VIH = 2.0 V min), operates from 4.5 V to 5.5 V, supports -40 °C to +125 °C ambient range, and delivers 17 ns propagation delay (Dn→Qn) at VCC = 4.5 V - enabling reliable interface between microcontrollers and peripheral buses.

For engineers reviewing the 74HCT373D,652 datasheet, 74HCT373D,652 pinout, 74HCT373D,652 application, or 74HCT373D,652 equivalent, this device serves as a bus-oriented latch where precise timing control, output enable coordination, and high-noise-immunity level translation are critical selection criteria.

Technical Context

The 74HCT373D,652 implements eight independent D-type latches with shared active-HIGH latch enable (LE) and active-LOW 3-state output enable (OE). Latch transparency occurs when LE is HIGH, allowing real-time D-input tracking; data is captured on the HIGH-to-LOW LE transition with 12 ns minimum setup time and 4 ns minimum hold time at VCC = 4.5 V.

Its 3-state outputs support bidirectional bus sharing, with OE controlling all eight outputs simultaneously without affecting internal latch states. Input clamp diodes permit safe interfacing to voltages exceeding VCC when current-limiting resistors are used, and CMOS construction ensures low static power consumption (8 μA typical ICC at VCC = 5.5 V).

Key Specifications

Pinout & Package

74HCT373D,652 is supplied in SO20 (SOT163-1) package: plastic small outline, 20 leads, 7.5 mm body width, gull-wing leads, JEDEC MS-013 compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal transparent latch applications.

Compared with 74HCT373D,652, the PW variant offers superior density and thermal performance in compact layouts, while the SN74HCT373N trades electrical precision and manufacturability for mechanical simplicity - making the D,652 optimal for automated SMT production targeting industrial temperature stability and bus integrity.

Availability

74HCT373D,652 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, microcontroller bus interface, and legacy instrument cluster interface requiring stable component supply across extended temperature ranges.

Supply support for 74HCT373D,652 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 emphasis on reliability, efficiency, and automotive-grade quality.

The 74HCT373 series belongs to Nexperia's standard logic portfolio, designed specifically for robust 5 V bus interfacing, data latching, and signal isolation in industrial, automotive, and computing applications.

FAQ

What is the minimum pulse width required on the LE input?

The minimum LE HIGH pulse width is 16 ns at VCC = 4.5 V, as specified in Table 7. This ensures reliable capture of input data without metastability. Shorter pulses risk incomplete latch operation or undefined output states, especially under worst-case temperature and voltage conditions.

Can OE be toggled while LE is HIGH without corrupting latched data?

Yes. The OE input controls only the output drivers and has no effect on internal latch states. When LE is HIGH and OE is toggled, Q outputs enter or exit high-impedance mode while retaining their current logic values - enabling dynamic bus sharing without data loss.

Is the 74HCT373D,652 compatible with 3.3 V microcontrollers?

No. Its TTL-compatible inputs require VIH ≥ 2.0 V but are rated only for VCC = 4.5–5.5 V operation. Driving it from a 3.3 V MCU violates recommended operating conditions and risks unreliable recognition of HIGH inputs. Use 74LVC373 or level-shifting circuitry instead.

How does the SO20 package affect thermal performance in continuous operation?

The SO20 (SOT163-1) package has a thermal resistance θJA of approximately 81 °C/W. At 50 mW dissipation (typical under full bus loading), junction temperature rise is ~4 °C above ambient - well within the 125 °C limit. Derating begins linearly at 12.3 mW/K above 109 °C ambient.