Nexperia USA Inc. 74HC573DB-Q100J

Overview

74HC573DB-Q100 from Nexperia is an AEC-Q100 Grade 1 qualified octal D-type transparent latch with 3-state outputs, designed for automotive bus interfacing. It operates from 2.0 V to 6.0 V, features independent latch enable (LE) and output enable (OE) controls, and delivers propagation delay as low as 14 ns at VCC = 6.0 V - enabling reliable data latching in engine control units and ADAS domain controllers.

For engineers reviewing the 74HC573DB-Q100 datasheet, 74HC573DB-Q100 pinout, 74HC573DB-Q100 application, or 74HC573DB-Q100 equivalent, this device serves as a high-noise-immunity, CMOS-level input latch for microprocessor I/O expansion, memory address latching, and bidirectional bus buffering in temperature-stressed automotive environments.

Technical Context

This device implements eight independent D-type latches with synchronous transparency: when LE is HIGH, Qn follows Dn in real time; when LE transitions LOW, the input state is captured and held. OE operates independently to place all outputs in high-impedance mode without affecting latch contents.

It supports dual logic families: 74HC573DB-Q100 uses CMOS-compatible input thresholds (VIH ≥ 3.15 V at VCC = 4.5 V), while its 74HCT variant accepts TTL-level inputs. Input clamp diodes allow safe interfacing with voltages exceeding VCC when used with current-limiting resistors.

Key Specifications

Pinout & Package

74HC573DB-Q100 is supplied in SOT339-1 (SSOP20) package - a 20-pin shrink small outline package with 0.65 mm pitch, body width 5.3 mm, and exposed thermal pad. Pin numbering follows standard JEDEC MS-012AA orientation with pin 1 index marker at top-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HC573PW-Q100, the DB variant provides AOI-capable solder joints for higher automotive yield; versus 74HCT573BQ-Q100, it trades TTL input tolerance for lower static current and tighter VIH/VIL thresholds at 3.3 V operation.

Availability

74HC573DB-Q100 is available at Aetrix Electronics and suitable for engine control units, ADAS domain controllers, and body electronics requiring stable component supply across extended temperature ranges and automotive lifecycle commitments.

Supply support for 74HC573DB-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 technologies, delivering high-performance logic, discrete, and MOSFET solutions optimized for automotive, industrial, and mobile markets.

The 74HC573-Q100 series belongs to Nexperia's automotive-qualified logic portfolio, engineered specifically for robust data latching in harsh-temperature, high-reliability vehicle subsystems with stringent AEC-Q100 compliance.

FAQ

What is the maximum clock frequency supported by 74HC573DB-Q100?

The 74HC573DB-Q100 does not operate on a clock signal - it is a transparent latch controlled by level-sensitive LE and OE inputs. Its usable data rate is governed by propagation delay (14 ns min at VCC = 6.0 V) and setup/hold times (9 ns/5 ns), supporting effective latching frequencies up to ~35 MHz in synchronous bus applications with proper timing margin.

Can 74HC573DB-Q100 be used with 3.3 V microcontrollers?

Yes. The 74HC573DB-Q100 operates down to 2.0 V and specifies VIH = 2.1 V (min) at VCC = 3.3 V, ensuring reliable recognition of 3.3 V logic HIGH from modern MCUs. Its CMOS inputs draw negligible current (<0.1 μA), avoiding loading issues on low-drive GPIOs.

Does this device require external pull-up or pull-down resistors on LE or OE?

No. LE and OE are active-HIGH and active-LOW digital inputs with standard CMOS thresholds and internal protection. However, in floating-input scenarios (e.g., unconnected test points), a 10 kΩ pull-down on OE and pull-up on LE is recommended to prevent unintended output enable or latch triggering during power-up or reset.

How does the SOT339-1 package differ thermally from SO20?

The SOT339-1 (SSOP20) package has a junction-to-ambient thermal resistance (RθJA) of 110 K/W, compared to 130 K/W for SO20 (SOT163-1). Its thinner profile and tighter lead pitch improve heat conduction through PCB copper, allowing 15 % higher continuous power dissipation (500 mW max) under identical board layout conditions.