NXP Semiconductors HEF4068BT,652

Overview

HEF4068BT,652 from NXP Semiconductors (formerly Philips) is an 8-input NAND gate IC in a 14-lead SO plastic package (SOT108-1), operating at supply voltages of 5 V, 10 V, or 15 V, with propagation delays as low as 22 ns at 15 V and CL = 50 pF, used in digital logic control systems requiring high-noise-immunity combinational logic.

For engineers reviewing the HEF4068BT,652 datasheet, HEF4068BT,652 pinout, HEF4068BT,652 application, or HEF4068BT,652 equivalent, key selection criteria include input count (8), supply voltage range (5–15 V), output drive capability, propagation delay vs. load capacitance dependency, and SO package thermal/mechanical compatibility with surface-mount production.

Technical Context

The HEF4068BT,652 implements a single 8-input NAND function using LOCMOS technology, with fully buffered outputs to ensure stable output impedance across switching patterns and high noise immunity. Its logic behavior conforms strictly to positive-logic NAND: output is LOW only when all eight inputs are HIGH.

AC performance is specified at Tamb = 25 °C with CL = 50 pF and input transition times ≤20 ns; propagation delays scale linearly with load capacitance per published formulas (e.g., tPLH = 22 ns + 0.16 ns/pF × CL at VDD = 15 V), enabling accurate timing budgeting in synchronous logic designs.

Key Specifications

Pinout & Package

HEF4068BT,652 is housed in a 14-lead small outline (SO) plastic package (SOT108-1), with 0.35 mm lead pitch, gull-wing leads, and standard JEDEC MO-153 outline dimensions.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-input NAND gate applications.

Compared with CD4068BE and 74HC30PW,118, the HEF4068BT,652 uniquely supports 5/10/15 V operation in an SO package, bridging legacy voltage requirements and surface-mount manufacturing - making it irreplaceable in multi-rail industrial upgrades where voltage headroom and SMT compatibility are both mandatory.

Availability

HEF4068BT,652 is available at Aetrix Electronics and suitable for industrial control logic, test equipment signal conditioning, legacy instrumentation interface, and digital panel controller applications requiring stable component supply and long-term obsolescence management.

Supply support for HEF4068BT,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

NXP Semiconductors is a global semiconductor company formed from the spin-off of Philips' semiconductor division, specializing in secure connectivity, automotive, industrial, and IoT solutions.

The HEF4068BT,652 belongs to the HE4000B LOCMOS logic family, designed for robust, low-power digital control in harsh industrial and instrumentation environments where wide supply voltage tolerance and noise immunity are essential.

FAQ

What logic function does the HEF4068BT,652 implement?

The HEF4068BT,652 implements a single 8-input NAND gate function: its output is LOW only when all eight inputs (pins 1–8) are HIGH, and HIGH otherwise. This behavior is defined by positive-logic NAND truth table and verified in the original Philips datasheet. The HEF4068BT,652 uses fully buffered output circuitry to maintain consistent switching characteristics regardless of input pattern sequence.

What supply voltages are supported by the HEF4068BT,652?

The HEF4068BT,652 supports three nominal supply voltages: 5 V, 10 V, and 15 V, with full AC and DC specifications guaranteed across this range. Propagation delays and power dissipation scale predictably with VDD, as documented in the January 1995 Philips datasheet. The HEF4068BT,652 is not rated for operation outside this range, and exceeding 15 V may cause permanent damage.

Is the HEF4068BT,652 pin-compatible with other 8-input NAND packages?

No - the HEF4068BT,652 has a unique 14-pin SO (SOT108-1) pinout optimized for surface-mount use, differing from DIP (SOT27-1) and cerdip (SOT73) variants of the same HEF4068B family. While logic function and electrical specs align across variants, mechanical pin spacing and lead form prevent direct substitution without PCB redesign. The HEF4068BT,652 requires its specific SO footprint.

How does load capacitance affect propagation delay in the HEF4068BT,652?

Propagation delay in the HEF4068BT,652 increases linearly with load capacitance, per published formulas: e.g., tPLH = 22 ns + 0.16 ns/pF × CL at VDD = 15 V. These equations allow precise delay prediction across real-world PCB trace and fanout capacitances. The HEF4068BT,652 datasheet specifies CL = 50 pF as the reference test condition, but actual system CL must be measured or simulated for timing closure.

What is the maximum operating temperature range for the HEF4068BT,652?

The HEF4068BT,652 is characterized for operation from −40 °C to +85 °C, consistent with industrial-grade LOCMOS logic devices. All AC and DC parameters in the Philips datasheet are guaranteed within this ambient temperature range. The HEF4068BT,652 is not qualified for extended temperature ranges (e.g., −55 °C to +125 °C) or automotive AEC-Q100 stress testing.