Nexperia USA Inc. HEF4077BT,652

Overview

HEF4077BT,652 from Nexperia is a quad 2-input EXCLUSIVE-NOR gate in SO14 package, operating across 3.0 V to 15.0 V supply, with symmetrical CMOS output drive (±3.6 mA at 15 V), propagation delay as low as 25 ns (15 V, CL = 50 pF), and full industrial temperature range (-40 °C to +85 °C). It serves as a logic-level signal combiner in digital control interfaces, bus arbitration circuits, and parity generation in legacy industrial controllers.

For engineers reviewing the HEF4077BT,652 datasheet, HEF4077BT,652 pinout, HEF4077BT,652 application, or HEF4077BT,652 equivalent, key selection criteria include supply voltage flexibility (3–15 V), input clamping diodes enabling overvoltage-tolerant interfacing, guaranteed static operation, JEDEC JESD13-B compliance, and SO14 footprint compatibility with legacy 4000B-series designs.

Technical Context

The HEF4077BT,652 implements four independent EXNOR logic functions using complementary metal-oxide-semiconductor (CMOS) technology, with fully static operation and no minimum clock or refresh requirement. Each gate accepts two inputs (nA/nB) and delivers a single inverted XOR output (nY), per IEEE Std 91-1984 logic convention.

Input clamping diodes allow safe interface to signals exceeding VDD when used with current-limiting resistors; output stages provide matched rise/fall times (e.g., 20 ns typical at 15 V, CL = 50 pF) and rail-to-rail swing (VOH ≥ 14.95 V, VOL ≤ 0.05 V at 15 V). Propagation delay scales predictably with supply voltage and load capacitance via published extrapolation formulas.

Key Specifications

Pinout & Package

HEF4077BT,652 is housed in a plastic small outline package (SO14), SOT108-1 variant, with 14 leads, 3.9 mm body width, and standard 1.27 mm lead pitch. Pin 1 is marked by a bevelled corner or notch; pin numbering follows counter-clockwise sequence from top-left when viewed face-up with marking side up.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar EXCLUSIVE-NOR logic applications.

Compared with CD4077BE and 74HC86, the HEF4077BT,652 uniquely combines JEDEC-compliant XNOR functionality, 3–15 V operation, industrial temperature rating, and integrated input clamping-making it the sole choice for robust, voltage-flexible, standards-aligned discrete logic in legacy-compatible designs.

Availability

HEF4077BT,652 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, legacy bus parity generation, digital panel meter logic, and power sequencing verification requiring stable component supply and long-term obsolescence management.

Supply support for HEF4077BT,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 delivering high-performance logic, discrete, and MOSFET solutions optimized for efficiency, reliability, and manufacturability in industrial, automotive, and consumer applications.

The HEF4077BT,652 belongs to Nexperia's 4000B-series CMOS logic family, engineered for backward compatibility with legacy 4000-series designs while enhancing ESD robustness, parametric consistency, and JEDEC standard alignment.

FAQ

Can HEF4077BT,652 operate at 3.3 V?

Yes - the device is fully specified from 3.0 V to 15.0 V, including VIH/VIL thresholds and output drive at 3.3 V. At VDD = 3.3 V, VIH ≥ 2.31 V and VIL ≤ 1.1 V (per Table 6), and IOH/IOL remain functional though reduced versus higher voltages. Propagation delay increases to ~100 ns (typical) at 3.3 V with 50 pF load.

Does HEF4077BT,652 require external pull-up or pull-down resistors on unused inputs?

No - unused inputs must be tied to VDD or VSS to prevent floating nodes and undefined output states. The device has no internal pull-ups/pull-downs; leaving inputs unconnected risks increased supply current, oscillation, or excessive power dissipation due to intermediate input voltage levels.

What is the maximum capacitive load the outputs can drive reliably?

The outputs are characterized up to 50 pF (per Table 10 test conditions), with propagation delay and transition time scaling linearly per published formulas (e.g., tPHL = 22 ns + 0.16 ns/pF × CL at 15 V). For stable operation beyond 50 pF, add a series resistor (e.g., 33 Ω) near the driver to dampen ringing and maintain signal integrity.

Is HEF4077BT,652 pin-compatible with older HEF4077B variants in DIP or TSSOP packages?

Yes - the SO14 (SOT108-1) pinout matches the original HEF4077B in plastic DIP (SOT27-1) and TSSOP (SOT402-1) packages for pins 1–14. Functional behavior, timing, and DC specs are identical; only package dimensions and thermal characteristics differ. PCB layout adaptation is required solely for footprint geometry.