NXP Semiconductors HEF4514BT,653

Overview

HEF4514BT,653 from NXP Semiconductors (formerly Philips) is a 1-of-16 decoder/demultiplexer with input latches, used for address decoding and digital multiplexing in MSI logic systems. It features four binary-weighted address inputs (A0–A3), active LOW enable (E), latch enable (EL), and 16 mutually exclusive active HIGH outputs (O0–O15). Operates at VDD = 5 V, 10 V, or 15 V with propagation delays as low as 45 ns (E → On, VDD = 15 V, CL = 50 pF).

For engineers reviewing the HEF4514BT,653 datasheet, HEF4514BT,653 pinout, HEF4514BT,653 application, or HEF4514BT,653 equivalent, this page delivers verified functional behavior, latch-controlled output stability, SO-24 package mapping, AC timing under defined load conditions, and direct alternatives for legacy LOCMOS system upgrades.

Technical Context

The HEF4514BT,653 implements a 4-bit binary-to-1-of-16 decoding function with transparent latching: when EL is HIGH, outputs follow A0–A3 in real time; when EL goes LOW, the current address is latched and held independent of further A-input changes. The E input enables/disables all outputs without affecting latch state.

It belongs to the HE4000B LOCMOS family, optimized for low power and high noise immunity. All 16 outputs are active HIGH and mutually exclusive - only one output is HIGH per valid address + enable condition. No internal pull-ups or open-drain configuration is present.

Key Specifications

Pinout & Package

HEF4514BT,653 is housed in a 24-pin plastic small-outline (SO) package per SOT137-1 outline, with 300 mil body width and standard gull-wing leads. Pin pitch is 0.050 inch (1.27 mm).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 1-of-16 decoder/demultiplexer applications.

Compared with CD4514BE and 74HC4514, the HEF4514BT,653 uniquely supports 15 V operation with LOCMOS efficiency and sub-50 ns enable-path delay - making it irreplaceable in legacy industrial controllers and mixed-voltage instrumentation where latch stability and wide supply range are mandatory.

Availability

HEF4514BT,653 is available at Aetrix Electronics and suitable for memory address decoding, digital multiplexing, hexadecimal display driving, and industrial I/O expansion requiring stable component supply across long-lifecycle embedded programs.

Supply support for HEF4514BT,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 HEF4514BT,653 belongs to the HE4000B LOCMOS logic family, designed specifically for high-noise industrial environments requiring wide supply voltage tolerance, latch-based address stability, and low static power in medium-scale integration systems.

FAQ

What is the maximum operating voltage for HEF4514BT,653?

The HEF4514BT,653 supports a maximum supply voltage of 15 V, as specified in its AC and DC characteristics tables. This allows direct use in legacy 12 V and 15 V industrial control systems without level-shifting circuitry. Operation above 15 V risks permanent damage. The device remains fully functional down to 5 V, enabling interoperability with modern 5 V microcontrollers. Always reference the absolute maximum ratings section of the original Philips HEF4514B datasheet for derating guidance at elevated temperatures.

Does HEF4514BT,653 require external pull-up resistors on its outputs?

No, HEF4514BT,653 does not require external pull-up resistors. Its 16 outputs (O0–O15) are buffered active HIGH push-pull drivers capable of sourcing up to 4.2 mA (VDD = 5 V) or 8.8 mA (VDD = 15 V) per output, as defined in the DC electrical characteristics. These outputs directly drive TTL/CMOS inputs or low-power LEDs without external components. Pull-ups would conflict with the active HIGH logic polarity and risk excessive current draw during output transitions.

How does the latch enable (EL) function interact with the enable input (E) in HEF4514BT,653?

In the HEF4514BT,653, EL and E operate independently: EL controls whether address inputs A0–A3 are latched (EL LOW) or transparent (EL HIGH), while E gates output activity (E LOW enables one output; E HIGH forces all outputs LOW). Critically, changing E has no effect on latch content - the stored address remains intact even when E toggles. This decoupling allows asynchronous output enable/disable while preserving decoded address state, a key feature for glitch-free chip select generation in microprocessor systems.

Is HEF4514BT,653 pin-compatible with HEF4514BD or HEF4514BP packages?

No, HEF4514BT,653 is not pin-compatible with HEF4514BD or HEF4514BP. While all three share identical logic functionality and pin functions, they differ in physical package: HEF4514BT,653 uses a 24-pin SO (SOT137-1), HEF4514BD uses 24-pin CERDIP (SOT94), and HEF4514BP uses 24-pin DIP (SOT101-1). Footprints, thermal profiles, and reflow compatibility differ significantly. PCB layout must match the specific package variant - no mechanical interchangeability exists despite functional equivalence.

What is the minimum pulse width required on EL for reliable latching in HEF4514BT,653?

The minimum EL HIGH pulse width required for reliable latching in HEF4514BT,653 is 30 ns at VDD = 15 V, per the "Minimum EL pulse width" specification in the AC Characteristics table. At lower supply voltages, the requirement increases: 40 ns at VDD = 10 V and 120 ns at VDD = 5 V. This pulse must occur while A0–A3 are stable, and the set-up/hold times (30 ns/0 ns at 15 V) must also be met. Failure to meet these timing constraints may result in metastable latch states or incorrect output selection.