Nexperia USA Inc. 74AHCT245D-Q100J

Overview

74AHCT245D-Q100 from Nexperia is an automotive-grade octal bus transceiver with 3-state outputs, direction control (DIR), and active-low output enable (OE). It operates from 4.5 V to 5.5 V, supports -40 °C to +125 °C ambient range, features TTL-level inputs, overvoltage-tolerant inputs up to 5.5 V, and delivers propagation delay as low as 3.5 ns (VCC = 5 V, CL = 15 pF). It is used in bidirectional data bus interfacing between microcontrollers and peripheral ICs in engine control units.

For engineers reviewing the 74AHCT245D-Q100 datasheet, 74AHCT245D-Q100 pinout, 74AHCT245D-Q100 application, or 74AHCT245D-Q100 equivalent, key selection criteria include its AEC-Q100 Grade 1 qualification, SO20 package compatibility, TTL input threshold (VIH = 2.0 V, VIL = 0.8 V), 8-bit bidirectional data translation capability, and 3-state output isolation for bus contention prevention.

Technical Context

This device implements a dual-rail 8-bit bidirectional bus interface with independent DIR and OE controls. Its TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V) ensure reliable interfacing with legacy 5 V logic families, while overvoltage-tolerant inputs (up to 5.5 V) support mixed-voltage domain bridging without level shifters.

The SO20 (SOT163-1) package provides 20-pin surface-mount compatibility with 7.5 mm body width and 1.27 mm lead pitch. Propagation delays are balanced across all eight channels (tpd ≤ 7.7 ns typ at VCC = 5 V, CL = 15 pF), and enable/disable timing (ten ≤ 10.0 ns, tdis ≤ 12.5 ns) ensures fast bus arbitration in real-time automotive subsystems.

Key Specifications

Pinout & Package

74AHCT245D-Q100 uses the SO20 plastic small outline package (SOT163-1), 20-lead, 7.5 mm body width, 1.27 mm pitch, with gull-wing leads suitable for reflow soldering and AOI inspection.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal bus transceiver applications.

Compared with 74AHCT245PW-Q100, the D-package offers superior thermal performance and mechanical robustness for under-hood mounting; compared with SN74LVC245A-Q1, it provides guaranteed automotive qualification, wider voltage tolerance, and proven reliability in harsh environments.

Availability

74AHCT245D-Q100 is available at Aetrix Electronics and suitable for engine control units, ADAS sensor hubs, and infotainment head units requiring stable component supply across automotive production lifecycles.

Supply support for 74AHCT245D-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 delivering high-performance, reliable components for automotive, industrial, and consumer markets, with leadership in logic, discrete, and MOSFET technologies.

The 74AHCT-Q100 series is designed specifically for automotive applications demanding AEC-Q100 Grade 1 reliability, extended temperature operation, and robust ESD/latch-up immunity in safety-critical electronic control units.

FAQ

Is 74AHCT245D-Q100 pin-compatible with standard 74HC245 or 74LS245 devices?

No. While functionally similar, 74AHCT245D-Q100 uses TTL-level inputs (VIH = 2.0 V min), whereas 74HC245 uses CMOS-level inputs (VIH ≈ 3.5 V at 5 V) and 74LS245 has different drive strength and timing. Pinout matches industry-standard 20-pin SO bus transceivers (e.g., DIR on pin 1, OE on pin 19), but electrical interface behavior differs significantly.

Can 74AHCT245D-Q100 operate reliably at 3.3 V supply?

No. The 74AHCT245 variant is specified only for 4.5 V to 5.5 V operation. At 3.3 V, input thresholds become undefined and output drive falls outside specification. For 3.3 V systems, use the 74AHC245D-Q100 variant (CMOS inputs) or 74LVC245A-Q1 (if AEC-Q100 compliance is not required).

What is the maximum capacitive load this device can drive while maintaining timing specs?

The datasheet guarantees timing performance up to 50 pF load capacitance (CL). At CL = 50 pF and VCC = 5 V, propagation delay remains ≤ 8.7 ns (74AHCT245), enable time ≤ 16.0 ns, and disable time ≤ 19.5 ns. Exceeding 50 pF increases delay nonlinearly and may violate setup/hold margins in high-speed bus designs.

Does the SO20 package (SOT163-1) support automatic optical inspection (AOI)?

Yes. The SO20 package used for 74AHCT245D-Q100 features gull-wing leads with defined solder fillet geometry and coplanarity compliant with IPC-A-610 Class 3 standards, enabling reliable AOI detection of solder joint voids, bridging, and insufficient wetting in automotive manufacturing lines.