Nexperia USA Inc. HEF40244BT-Q100J

Overview

HEF40244BT-Q100 from Nexperia is an automotive-qualified octal 3-state buffer/line driver with dual independent output-enable controls (1OE and 2OE), operating across 3.0 V to 15.0 V supply, delivering ±25 mA output drive at 15 V, and supporting -40 °C to +85 °C ambient for body control modules and infotainment data bus isolation.

For engineers reviewing the HEF40244BT-Q100 datasheet, HEF40244BT-Q100 pinout, HEF40244BT-Q100 application, or HEF40244BT-Q100 equivalent, key selection criteria include dual 4-bit enable partitioning, CMOS-level input clamping for overvoltage-tolerant interfacing, AEC-Q100 Grade 3 qualification, and propagation delay scalability with load capacitance (e.g., 30–60 ns at 15 V, CL = 50 pF).

Technical Context

The HEF40244BT-Q100 implements two independent 4-bit buffer sections (A and B), each with active-low output enables (EOA on Pin 1, EOB on Pin 19) controlling high-impedance state transitions. Its CMOS output stage uses complementary P-channel and N-channel transistors, enabling rail-to-rail output swing and bidirectional current sourcing/sinking capability up to ±25 mA per output.

Input clamping diodes allow safe interface to signals exceeding VDD when used with external current-limiting resistors. The device supports variable-speed operation via supply-voltage-dependent propagation delays - tPHL/tPLH range from 95 ns (5 V) to 30 ns (15 V) under 50 pF load - and exhibits hysteresis (320 mV typical at 15 V) for noise-immune signal conditioning in noisy automotive environments.

Key Specifications

Pinout & Package

HEF40244BT-Q100 is housed in a plastic small outline package (SO20), SOT163-1 variant, with 20 leads, 7.5 mm body width, and standard 1.27 mm lead pitch - compatible with automated surface-mount assembly and IPC-7351B land patterns.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal 3-state buffer applications.

Compared with SN74LVCH16244A-Q1 and 74HC244-Q100, the HEF40244BT-Q100 uniquely combines wide-voltage operation (3–15 V), integrated input clamping, and AEC-Q100 Grade 3 qualification - making it the sole option for robust, overvoltage-tolerant, dual-lane buffering in production automotive ECUs.

Availability

HEF40244BT-Q100 is available at Aetrix Electronics and suitable for body control modules, instrument clusters, infotainment head units, and telematics control units requiring stable component supply across automotive production lifecycles.

Supply support for HEF40244BT-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 leading semiconductor manufacturer specializing in high-performance, high-reliability logic, analog, and discrete components optimized for automotive, industrial, and mobile applications.

The HEF40244BT-Q100 belongs to Nexperia's automotive-qualified logic portfolio, designed specifically to meet AEC-Q100 Grade 3 requirements for robust signal buffering in electrically noisy, thermally demanding vehicle subsystems.

FAQ

What is the maximum allowable input voltage relative to VDD?

The HEF40244BT-Q100 features integrated input clamp diodes that permit safe operation with input voltages up to VDD + 0.5 V, provided external current-limiting resistors are used to restrict IIK to ≤ ±10 mA. This enables direct interfacing with 12 V wake-up signals or LIN transceivers without additional protection circuitry.

Can both output groups be enabled simultaneously without performance degradation?

Yes - the HEF40244BT-Q100 supports concurrent enablement of both Group A (EOA = LOW) and Group B (EOB = LOW). Total power dissipation remains within the 500 mW limit even with all eight outputs driving 25 mA loads at 15 V, as verified by dynamic power formulas in Table 8 of the datasheet.

Is the SO20 (SOT163-1) package RoHS and REACH compliant?

Yes - the HEF40244BT-Q100 in SOT163-1 packaging meets RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006, with lead-free terminations and halogen-free molding compound. Compliance documentation is available through Nexperia's product change notifications and material declarations portal.

How does propagation delay vary with supply voltage and load capacitance?

Propagation delay scales inversely with VDD and linearly with load capacitance: e.g., tPHL = 26 ns + (0.07 ns/pF) × CL at 15 V, versus 83 ns + (0.24 ns/pF) × CL at 5 V. This relationship is defined in Table 7 and enables precise timing budgeting across automotive voltage rails and PCB trace loads.