Nexperia USA Inc. 74HCT573DB-Q100J

Overview

74HCT573DB-Q100 from Nexperia is an automotive-grade octal D-type transparent latch with 3-state outputs, latch enable (LE) and output enable (OE) control inputs, TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V), propagation delay of 20–53 ns (VCC = 4.5 V, CL = 50 pF), and operation across -40 °C to +125 °C for use in automotive body control modules interfacing microcontroller data buses.

For engineers reviewing the 74HCT573DB-Q100 datasheet, 74HCT573DB-Q100 pinout, 74HCT573DB-Q100 application, or 74HCT573DB-Q100 equivalent, key selection criteria include its AEC-Q100 Grade 1 qualification, 3-state bus-driving capability, TTL-level input compatibility, SO20 package pin mapping, and latch transparency timing behavior under LE control.

Technical Context

This device implements eight independent D-type latches with shared LE and OE controls, enabling simultaneous capture of 8-bit parallel data on a HIGH-to-LOW LE transition while maintaining prior state otherwise. Its 3-state outputs support bidirectional bus arbitration without external logic.

The latch operates with CMOS output stages delivering VOH ≥ 3.98 V and VOL ≤ 0.26 V at IO = ±6 mA (VCC = 4.5 V), and features input clamp diodes allowing safe interfacing to voltages exceeding VCC when used with current-limiting resistors.

Key Specifications

Pinout & Package

74HCT573DB-Q100 uses the SOT163-1 (SO20) plastic small outline package: 20-pin, 7.5 mm body width, 1.27 mm pitch, 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 74HCT573DB-Q100, the 74HCT573D-Q100 offers identical functionality with assured long-term supply, while SN74HCT573QPWRQ1 provides slightly faster timing but introduces second-source validation overhead and potential layout requalification.

Availability

74HCT573DB-Q100 is available at Aetrix Electronics and suitable for automotive body control units, industrial PLC I/O expansion, instrument cluster interfaces, and HVAC control panels requiring stable component supply with AEC-Q100 compliance.

Supply support for 74HCT573DB-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 focused on essential efficiency-enhancing components, with leadership in logic, discrete, and MOSFET technologies for automotive, industrial, and consumer markets.

The 74HCT573-Q100 series belongs to Nexperia's automotive-qualified logic portfolio, designed specifically to meet stringent reliability, temperature, and ESD requirements of modern vehicle ECUs and control modules.

FAQ

What is the maximum clock/data rate supported by 74HCT573DB-Q100?

The device does not operate on a clock signal but responds to latch enable (LE) edges. With propagation delay (D→Q) of 20–53 ns at VCC = 4.5 V and CL = 50 pF, it supports reliable data capture at effective rates up to ~10 MHz when LE is toggled synchronously. Minimum LE pulse width is 5 ns (VCC = 4.5 V), limiting maximum toggle frequency to 100 MHz in ideal conditions - though system-level timing margins and PCB trace effects typically constrain practical use to ≤20 MHz.

Can 74HCT573DB-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 minimum recommended VCC is 4.5 V per datasheet Table 5. Operating below 4.5 V risks violating VOH/VOL specifications and may cause unreliable 3-state control. For 3.3 V systems, use 74LVC573A or similar 3.3 V logic family latches instead.

How does the latch behave when OE is HIGH and LE transitions?

When OE = HIGH, all Qn outputs enter high-impedance (Z) regardless of LE state or Dn values. LE transitions have no effect on output states during OE = HIGH - the internal latches retain their last stored value, but outputs remain disconnected from the bus. Only when OE returns LOW do Qn outputs reflect the latched data, either transparently (LE = HIGH) or statically (LE = LOW).

Is there a recommended decoupling strategy for 74HCT573DB-Q100 in automotive PCB layouts?

Place a 100 nF X7R ceramic capacitor between VCC (pin 20) and GND (pin 10) with trace length < 5 mm and via placement adjacent to the pins. Add a 4.7 μF tantalum or polymer capacitor nearby (≤20 mm) for bulk low-frequency filtering. Avoid shared power planes with high-noise circuits like motor drivers; use dedicated local VCC/GND pours tied at a single point to the main power plane.