Nexperia USA Inc. 74HCT573BQ-Q100,11

Overview

74HCT573BQ-Q100 from Nexperia is an automotive-qualified octal D-type transparent latch with 3-state outputs, latch enable (LE) and output enable (OE) control, TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 5 V), operating from -40 °C to +125 °C, and housed in a 20-terminal DHVQFN package (2.5 × 4.5 × 0.85 mm). It serves as a bidirectional bus interface or microprocessor I/O port in automotive body control modules.

For engineers reviewing the 74HCT573BQ-Q100 datasheet, 74HCT573BQ-Q100 pinout, 74HCT573BQ-Q100 application, or 74HCT573BQ-Q100 equivalent, this device supports transparent latching with sub-20 ns propagation delay (VCC = 4.5 V, CL = 50 pF), high-impedance bus isolation via OE, and AEC-Q100 Grade 1 qualification for under-hood electronics.

Technical Context

The 74HCT573BQ-Q100 implements eight independent D-type latches with synchronous LE control and shared active-low OE. Its TTL-level inputs ensure compatibility with legacy 5 V logic families while maintaining CMOS power efficiency. Latch transparency occurs only when LE is HIGH; data is captured on the HIGH-to-LOW transition of LE.

Outputs drive to defined logic levels (VOH ≥ 3.98 V, VOL ≤ 0.26 V at IO = ±6 mA, VCC = 4.5 V) or enter high-impedance state when OE is HIGH - a behavior decoupled from latch state. Input clamp diodes allow safe interfacing to voltages exceeding VCC when used with current-limiting resistors.

Key Specifications

Pinout & Package

DHVQFN20 package (SOT764-1), 2.5 × 4.5 × 0.85 mm body, side-wettable flanks for AOI-compatible solder joint inspection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HCT573PW-Q100, the BQ variant offers superior manufacturability via AOI-ready side-wettable flanks; versus SN74HCT573QPWRQ1, it delivers identical electrical performance with Nexperia's optimized thermal pad layout for higher-power automotive derating.

Availability

74HCT573BQ-Q100 is available at Aetrix Electronics and suitable for automotive body control modules, instrument clusters, engine control units, and ADAS camera power sequencers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HCT573BQ-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 specializing in high-performance, high-reliability logic, discrete, and MOSFET solutions for automotive, industrial, and consumer markets.

The 74HCT573-Q100 series belongs to Nexperia's automotive-qualified logic portfolio, engineered specifically for robust bus interfacing in harsh-temperature environments with stringent AEC-Q100 compliance.

FAQ

What is the maximum clock/data toggle frequency supported by the 74HCT573BQ-Q100?

The device does not operate on a clock signal but functions as a level-sensitive transparent latch. Its usable data rate is governed by propagation delay (20 ns typ D→Q at VCC = 4.5 V) and setup/hold times (13 ns su / 9 ns h at VCC = 4.5 V), supporting reliable operation up to approximately 25 MHz in synchronous bus systems with proper timing margining.

Can the 74HCT573BQ-Q100 interface directly with 3.3 V microcontrollers?

No - its TTL-compatible inputs require VIH ≥ 2.0 V, which is met by 3.3 V logic, but its outputs swing rail-to-rail (VOH ≈ VCC, VOL ≈ 0 V) and are specified only for VCC = 4.5–5.5 V. Driving a 3.3 V receiver requires external voltage translation or clamping, as 5 V outputs exceed absolute maximum ratings of most 3.3 V ICs.

Is the thermal pad on the DHVQFN package required to be soldered to ground?

No - per Nexperia's datasheet, the exposed pad (terminal 1) has no electrical or mechanical requirement to be soldered. If connected, it must remain floating or be tied to GND; it is not internally bonded to any die potential and serves only as a thermal conduction path when soldered.

How does the 74HCT573BQ-Q100 behave during power-up when VCC ramps from 0 V to 5 V?

During power-up, outputs remain in high-impedance state until VCC exceeds ~1.5 V and OE is actively driven LOW. Inputs are protected by clamp diodes, preventing damage from early signal assertion. The latch state is undefined until first valid LE transition occurs post-power-stabilization, requiring system-level initialization sequencing.