NXP Semiconductors HEF4514BT,652

Overview

HEF4514BT,652 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,652 datasheet, HEF4514BT,652 pinout, HEF4514BT,652 application, or HEF4514BT,652 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,652 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 transitions LOW, the current address is latched and held independently of further address changes. The E input enables/disables all outputs without affecting latch state.

It belongs to the HE4000B LOCMOS family, optimized for low power consumption and high noise immunity. Output transition times scale linearly with load capacitance (e.g., tTHL = 11 ns + 0.28 ns/pF × CL at VDD = 15 V), and dynamic power dissipation follows P = 16,000 fi + ∑(foCL) × VDD² (µW) at VDD = 15 V.

Key Specifications

Pinout & Package

HEF4514BT,652 uses a 24-pin plastic small-outline (SO) package per SOT137-1 outline, with 300 mil body width and standard gull-wing leads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD4514BE and 74HC4514, the HEF4514BT,652 provides deterministic latch timing under 15 V operation, LOCMOS-level noise rejection, and guaranteed sub-50 ns enable-to-output delay - making it irreplaceable in legacy industrial control systems where signal integrity and voltage headroom are constrained.

Availability

HEF4514BT,652 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 extended product lifecycles.

Supply support for HEF4514BT,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 leader focused on secure connectivity solutions for automotive, industrial, and IoT applications, with roots in Philips' pioneering IC development.

The HEF4514BT,652 belongs to the HE4000B LOCMOS logic family, designed specifically for robust, low-power MSI functions in harsh industrial environments where voltage variation and EMI resilience are critical.

FAQ

What is the function of the EL pin on the HEF4514BT,652?

The EL (Latch Enable) pin on the HEF4514BT,652 controls latching of the A0–A3 address inputs: when EL transitions from HIGH to LOW, the current address is stored in internal latches and held stable. Outputs remain unchanged until EL goes HIGH again and a new address is presented. This allows asynchronous address capture independent of the enable (E) signal. The HEF4514BT,652 datasheet specifies a minimum EL pulse width of 30 ns at VDD = 15 V to ensure reliable latching.

Does the HEF4514BT,652 support 5 V-only operation?

Yes, the HEF4514BT,652 operates across VDD = 5 V to 15 V, with full AC/DC specifications guaranteed at 5 V, 10 V, and 15 V. At 5 V, propagation delays increase (e.g., E→On max = 350 ns), and dynamic power drops significantly (P = 1100 fi + ∑(foCL) × 25 µW). Its LOCMOS process ensures TTL-compatible input thresholds and noise margins even at 5 V, making it suitable for mixed-voltage legacy systems. The HEF4514BT,652 remains fully functional and characterized across this entire range.

How does the HEF4514BT,652 behave when both E and EL are HIGH?

When both E and EL are HIGH, the HEF4514BT,652 operates in transparent decode mode: outputs O0–O15 respond immediately to changes on A0–A3, with propagation delay dependent on VDD and load. All outputs remain LOW if E is HIGH, regardless of EL or address state - E is the master output enable and overrides all other controls. Only when E is LOW do the latched or real-time address values determine which single output goes HIGH. This behavior is confirmed in the truth table and functional description of the HEF4514BT,652 datasheet.

Is the HEF4514BT,652 pin-compatible with the HEF4514BD(F) ceramic DIP version?

No - the HEF4514BT,652 uses a 24-pin SO package (SOT137-1), while the HEF4514BD(F) uses a 24-pin ceramic DIP (SOT94). Although both share identical pin numbering and logic function, their physical footprints, thermal characteristics, and soldering requirements differ. PCB layout must be revised to accommodate the SO package's gull-wing leads and smaller body size. The HEF4514BT,652 is not a drop-in replacement for through-hole variants without board redesign.

What is the maximum capacitive load the HEF4514BT,652 can drive reliably?

The HEF4514BT,652 is characterized up to CL = 50 pF in its AC specifications, with extrapolation formulas provided (e.g., tPHL = 57 ns + 0.16 ns/pF × CL at VDD = 15 V). While not explicitly rated beyond 50 pF, the LOCMOS output stage can typically drive ≥100 pF with acceptable timing degradation in non-critical paths. For designs exceeding 50 pF, users must recalculate delays using the published formulas and verify setup/hold margins. The HEF4514BT,652 datasheet does not guarantee performance beyond the tested 50 pF load.