Nexperia USA Inc. HEF4050BT,653

Overview

HEF4050BT,653 from Nexperia is a hex non-inverting CMOS buffer with overvoltage-tolerant inputs rated to 15.0 V, enabling HIGH-to-LOW level shifting in mixed-voltage logic interfaces. It operates across 3.0 V to 15.0 V supply, delivers ±24 mA output drive at 15 V, and features symmetrical output characteristics with guaranteed TTL fan-out of 2. Used in LOCMOS-to-DTL/TTL conversion and industrial control I/O buffering.

For engineers reviewing the HEF4050BT,653 datasheet, HEF4050BT,653 pinout, HEF4050BT,653 application, or HEF4050BT,653 equivalent, key selection criteria include input overvoltage tolerance (15 V), wide VDD range (3–15 V), static operation, -40 °C to +85 °C temperature rating, and SO16 package compatibility with legacy 4000B-series designs.

Technical Context

The HEF4050BT,653 implements six independent non-inverting buffer stages using standard CMOS technology with input protection diodes clamping to VDD and VSS. Each input withstands up to 15.0 V regardless of VDD, allowing safe interfacing between higher-voltage logic domains and lower-voltage systems.

Its propagation delay scales with supply voltage and load capacitance: tPHL = 12 ns + (0.05 ns/pF)CL at VDD = 15 V, and output transition times remain under 14 ns (tTHL) and 40 ns (tTLH) under typical conditions. Static current remains below 120 μA across temperature and voltage.

Key Specifications

Pinout & Package

HEF4050BT,653 is housed in a plastic small outline package (SO16), SOT109-1 variant, with 16 leads, 3.9 mm body width, and standard 1.27 mm lead pitch. Pin 1 is marked by a notch or index dot; pins 13 and 16 are not connected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD4050BE and 74HC4050PW, HEF4050BT,653 uniquely combines 15 V input tolerance, 3–15 V operation, and industrial temperature range - making it the only drop-in solution for mixed-voltage legacy logic interfacing without redesign.

Availability

HEF4050BT,653 is available at Aetrix Electronics and suitable for industrial control systems, factory automation I/O modules, and legacy logic migration projects requiring stable component supply and long-term obsolescence management.

Supply support for HEF4050BT,653 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 logic, discrete, and MOSFET solutions with focus on efficiency, reliability, and sustainability.

The HEF4050BT,653 belongs to Nexperia's legacy 4000B-series logic portfolio, designed specifically for robust, wide-voltage-range interfacing in industrial, automotive (non-safety), and instrumentation applications.

FAQ

Can HEF4050BT,653 operate with VDD = 3.3 V while accepting 5 V inputs?

Yes. Its inputs tolerate up to 15.0 V regardless of VDD setting, so 5 V signals are safely accepted at VDD = 3.3 V. Output high-level voltage will be ~3.3 V, meeting 3.3 V logic thresholds. Propagation delay increases slightly (≈55 ns at CL = 50 pF), but remains functional for most control applications.

What is the maximum capacitive load per output?

The datasheet specifies dynamic performance up to 50 pF load capacitance in timing tests, and total power dissipation limits (500 mW) constrain sustained drive into heavier loads. For reliable operation beyond 50 pF, add series termination or reduce switching frequency - no absolute maximum CL is defined, but stability degrades above ~100 pF without buffering.

Are pins 13 and 16 internally connected or truly floating?

Pins 13 and 16 are explicitly designated "n.c." (not connected) in Table 2 and Fig. 4. They have no internal bond wires or silicon connections. Leaving them unconnected is mandatory; soldering or routing to any net may cause unpredictable behavior or damage due to parasitic coupling.

Does HEF4050BT,653 support hot insertion or live I/O swapping?

No. The device lacks hot-swap protection circuitry such as power-on reset, input current limiting, or slew-rate control. Applying input signals before VDD stabilization may forward-bias internal protection diodes, causing latch-up or excessive current draw. Power sequencing - VDD first, then inputs - is required.