NXP Semiconductors HEF4025BT,653

Overview

HEF4025BT,653 from NXP Semiconductors (formerly Philips) is a triple 3-input NOR gate IC in the HE4000B LOCMOS logic family, operating at supply voltages of 5 V, 10 V, or 15 V, with propagation delays as low as 12 ns at 15 V and CL = 50 pF, used in digital control logic, reset generation, and combinational logic synthesis in industrial timing and interface circuits.

For engineers reviewing the HEF4025BT,653 datasheet, HEF4025BT,653 pinout, HEF4025BT,653 application, or HEF4025BT,653 equivalent, key selection considerations include supply voltage range compatibility, output drive capability under capacitive load, noise immunity due to full buffering, and SO-14 package suitability for surface-mount production environments.

Technical Context

The HEF4025BT,653 implements three independent 3-input NOR gates using LOCMOS (Low-power CMOS) technology, ensuring high noise immunity via fully buffered outputs and pattern-insensitive output impedance. Each gate exhibits symmetric propagation delay behavior across HIGH-to-LOW and LOW-to-HIGH transitions.

AC performance is specified at Tamb = 25 °C with CL = 50 pF and input transition times ≤20 ns; delay values scale linearly with load capacitance per published extrapolation formulas, enabling accurate timing budgeting in synchronous logic designs.

Key Specifications

Pinout & Package

HEF4025BT,653 is housed in a 14-lead small-outline (SO) plastic package (SOT108-1), compatible with standard reflow soldering processes and offering reduced footprint versus DIP variants.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 3-input NOR gate applications.

Compared with CD4025BM96 and 74HC25D,653, the HEF4025BT,653 uniquely balances wide-voltage operation (3–15 V), robust noise immunity, and predictable delay scaling-making it the only option for retrofitting legacy 10 V/15 V logic while maintaining SO-14 surface-mount compatibility.

Availability

HEF4025BT,653 is available at Aetrix Electronics and suitable for industrial control sequencing, power-on reset generation, and legacy system logic retrofit requiring stable component supply and long-lifecycle support.

Supply support for HEF4025BT,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

NXP Semiconductors is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT applications, with roots in Philips' pioneering analog and logic IC development.

The HE4000B LOCMOS logic family-including HEF4025BT,653-was engineered for high-noise industrial environments requiring wide supply tolerance, low static power, and deterministic timing across temperature and voltage extremes.

FAQ

What is the maximum supply voltage rating for HEF4025BT,653?

The HEF4025BT,653 is rated for operation up to 15 V DC on VDD, with full AC and DC specifications guaranteed across the 3 V to 15 V range. Exceeding 15 V risks permanent damage to the LOCMOS gate oxides. The HEF4025BT,653 maintains specified propagation delay, output drive, and noise margin throughout this entire range, making it suitable for mixed-voltage industrial systems where 10 V or 15 V rails remain in use.

Does HEF4025BT,653 support 3.3 V operation?

Yes, the HEF4025BT,653 operates down to 3 V, with verified functionality and AC timing at that level-though propagation delay increases to 135 ns (max) and output drive reduces to ±1.2 mA. The HEF4025BT,653 remains fully compliant with its logic truth table and noise immunity specs at 3.3 V, enabling use in hybrid systems transitioning from legacy 5 V/15 V to modern low-voltage domains without logic-level translation.

Is HEF4025BT,653 pin-compatible with HEF4025BP,652?

No-HEF4025BT,653 uses a 14-lead SO package (SOT108-1), while HEF4025BP,652 is a 14-lead DIP (SOT27-1). Pin numbering and functions are identical, but physical dimensions, thermal characteristics, and soldering requirements differ. The HEF4025BT,653 cannot be substituted without PCB footprint revision, though logic behavior and electrical specs are identical across both packages.

What is the input capacitance of HEF4025BT,653?

The typical input capacitance of HEF4025BT,653 is 5 pF per input pin, measured at 1 MHz with VDD = 10 V. This low value minimizes loading on upstream drivers and supports high fan-out without excessive delay accumulation. All nine inputs (three gates × three inputs) exhibit matched capacitance, ensuring balanced timing across the HEF4025BT,653's internal logic array.

Can HEF4025BT,653 drive a 50 pF capacitive load reliably?

Yes-the HEF4025BT,653 AC specifications are explicitly characterized at CL = 50 pF, with propagation delays and transition times guaranteed under those conditions. At VDD = 15 V, the HEF4025BT,653 delivers 12 ns tPHL/tPLH and 6 ns tTHL/tTLH into 50 pF, confirming robust performance for typical PCB trace + input gate loading. No external buffering is needed for such loads.