Nexperia USA Inc. HEF4049BT,652

Overview

HEF4049BT,652 from Nexperia is a hex CMOS inverting buffer with overvoltage-tolerant inputs rated to 15.0 V, enabling HIGH-to-LOW level shifting between logic families. It operates across 3.0–15.0 V supply, delivers ±24 mA output sink/source at 15 V, and features symmetrical output drive with guaranteed TTL fan-out of 2. It is used in LOCMOS-to-DTL/TTL interfacing and mixed-voltage system bus buffering.

For engineers reviewing the HEF4049BT,652 datasheet, HEF4049BT,652 pinout, HEF4049BT,652 application, or HEF4049BT,652 equivalent, key selection criteria include input overvoltage tolerance, static CMOS operation across wide V_DD, symmetrical output drive strength, temperature range (-40 °C to +85 °C), and SO16 package compatibility with legacy 4000-series footprints.

Technical Context

The HEF4049BT,652 implements six independent CMOS inverter stages with fully static operation and no minimum clock or refresh requirement. Each gate uses complementary MOSFET pairs with standardized output impedance and rail-to-rail swing, supporting direct interface to TTL, DTL, and 5/10/15 V logic systems.

Input protection includes clamping diodes rated for ±10 mA clamp current and 15 V overvoltage tolerance-enabling safe connection to higher-voltage signal sources without external components. The device complies with JEDEC JESD13-B and achieves HBM ESD >2000 V and CDM >1000 V.

Key Specifications

Pinout & Package

HEF4049BT,652 is housed in a plastic small outline package (SO16) per SOT109-1 standard: 16-pin, 3.9 mm body width, 1.27 mm lead pitch, gull-wing leads, and surface-mount compatible footprint.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar hex inverting buffer applications.

Compared with CD4049UBE and 74HC04PW, the HEF4049BT,652 uniquely combines 15 V input tolerance, 3–15 V operation, and JEDEC compliance-making it the sole option for robust HIGH-to-LOW level shifting in industrial mixed-voltage designs.

Availability

HEF4049BT,652 is available at Aetrix Electronics and suitable for industrial control backplanes, retro-computing interface modules, mixed-voltage test equipment, and LOCMOS-based instrumentation requiring stable component supply across extended temperature ranges.

Supply support for HEF4049BT,652 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, reliable discrete, logic, and MOSFET solutions for automotive, industrial, and consumer markets.

The HEF4049BT,652 belongs to Nexperia's legacy-compatible logic portfolio, designed specifically to replace aging 4000-series devices with enhanced robustness, wider voltage operation, and modern reliability qualifications.

FAQ

Can HEF4049BT,652 operate with VDD = 3.3 V while accepting 5 V inputs?

Yes. Its inputs are overvoltage tolerant to 15.0 V regardless of VDD setting, so 5 V signals may be applied safely even when powered from 3.3 V. Output swing will be 0–3.3 V, preserving logic levels for downstream 3.3 V receivers.

What is the maximum capacitive load each output can drive while meeting timing specs?

Each output meets guaranteed propagation delay (≤40 ns t_PLH) and transition time (≤40 ns t_TLH) with up to 50 pF load capacitance at VDD = 15 V. Exceeding 50 pF increases delay nonlinearly per the CL-dependent extrapolation formulas in the datasheet.

Are Pins 13 and 16 internally connected or truly unused?

Pins 13 and 16 are explicitly designated "n.c." (not connected) in the official pin description table. They are unconnected die bond pads with no internal circuit attachment-safe to leave floating or tie to VSS for mechanical stability, but not required.

Does HEF4049BT,652 support partial power-down or I²C bus hold functionality?

No. It lacks bus-hold or power-down modes. All six inverters remain active whenever VDD is within specification. For I²C applications, external pull-ups and open-drain configuration are required; this device functions only as a push-pull inverter, not a bidirectional buffer.