Nexperia USA Inc. HEF4520BT-Q100J

Overview

HEF4520BT-Q100 from Nexperia is an automotive-qualified dual 4-bit synchronous binary counter IC with two independent clock inputs (nCP0 and nCP1), buffered Q0–Q3 outputs per counter, and asynchronous master reset (nMR). It operates across 3.0 V to 15.0 V supply, supports -40 °C to +85 °C ambient, and advances on either LOW-to-HIGH nCP0 (with nCP1 HIGH) or HIGH-to-LOW nCP1 (with nCP0 LOW), enabling flexible clock/enable routing in timing control circuits for engine management and body electronics.

For engineers reviewing the HEF4520BT-Q100 datasheet, HEF4520BT-Q100 pinout, HEF4520BT-Q100 application, or HEF4520BT-Q100 equivalent, this device serves as a drop-in AEC-Q100 Grade 3–compliant replacement for legacy 4000-series counters in automotive timing, event counting, and state sequencing where dual independent 4-bit counting with asymmetric edge-triggered clocks is required.

Technical Context

The HEF4520BT-Q100 implements two identical 4-bit binary counters sharing no internal coupling-each has dedicated clock inputs (nCP0/nCP1), master reset (nMR), and four buffered outputs (nQ0–nQ3). Clocking logic is fully static and tolerant of slow input transitions, supporting both edge-triggered modes within one package without external gating.

Its dual-clock architecture allows one input to serve as active clock while the other acts as enable: counter advances only when nCP0 rises while nCP1 = HIGH, or when nCP1 falls while nCP0 = LOW. Asynchronous nMR forces all eight outputs low regardless of clock state, ensuring deterministic reset in safety-critical automotive subsystems.

Key Specifications

Pinout & Package

HEF4520BT-Q100 is housed in a 16-pin SO16 plastic small outline package (SOT109-1), 3.9 mm body width, with gull-wing leads and standard JEDEC MS-012 footprint.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual binary counter applications.

Compared with CD4020BE and SN74HC4040DR, the HEF4520BT-Q100 uniquely delivers certified dual 4-bit synchronous counting with asymmetric edge triggering and full automotive temperature/voltage robustness - eliminating design compromises in powertrain and ADAS timing subsystems.

Availability

HEF4520BT-Q100 is available at Aetrix Electronics and suitable for engine control units, transmission control modules, and ADAS radar subsystems requiring stable component supply with guaranteed automotive-grade traceability and lifecycle continuity.

Supply support for HEF4520BT-Q100 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 specializing in high-performance, high-reliability logic, analog, and discrete components for automotive, industrial, and consumer markets.

The HEF4520BT-Q100 belongs to Nexperia's automotive-qualified logic portfolio, designed specifically to replace legacy 4000-series devices in safety-critical timing applications while meeting AEC-Q100 Grade 3 and ISO/TS 16949 manufacturing standards.

FAQ

Can HEF4520BT-Q100 operate reliably at 12 V in an automotive battery environment?

Yes. The device is specified for 3.0 V to 15.0 V operation and qualified across -40 °C to +85 °C. Its wide VDD range accommodates nominal 12 V battery systems, including cold-crank dips (~6 V) and load-dump transients (up to 15 V), without derating or external regulation.

Does HEF4520BT-Q100 support synchronous reset across both counters?

No. It features independent asynchronous master reset inputs (1MR and 2MR) on pins 7 and 15. There is no shared synchronous reset; each counter must be reset separately using its dedicated nMR line, enabling selective counter hold or initialization.

What is the maximum capacitive load the outputs can drive without degrading timing?

Dynamic characteristics are characterized up to 50 pF load capacitance (Table 9). At 15 V supply, propagation delay remains ≤50 ns and transition time ≤40 ns with CL = 50 pF. For heavier loads, add series termination or buffer stages to maintain timing integrity.

Is there internal protection against overvoltage on clock inputs when interfacing to 24 V sensors?

Yes. Inputs include integrated clamp diodes referenced to VSS and VDD. When used with appropriate current-limiting resistors (e.g., 10 kΩ), the device safely interfaces to 24 V signals without external TVS diodes or level shifters - confirmed by VI limits of -0.5 V to VDD + 0.5 V.