Nexperia USA Inc. HEF4894BT-Q100,118

Overview

HEF4894BT-Q100 from Nexperia is a 12-stage automotive-qualified shift-and-store register LED driver in SO20 (SOT163-1) package, featuring open-drain parallel outputs QP0–QP11, dual serial outputs QS1/QS2 for cascading, strobe-controlled data latching, and output enable (OE). It operates from 3 V to 15 V over −40 °C to +125 °C and supports high-speed or slow-rise clock cascading via QS1 (positive-edge) and QS2 (negative-edge) outputs. Used in automotive interior lighting control systems with PWM dimming.

For engineers reviewing the HEF4894BT-Q100 datasheet, HEF4894BT-Q100 pinout, HEF4894BT-Q100 application, or HEF4894BT-Q100 equivalent, key selection criteria include AEC-Q100 Grade 1 qualification, 12-bit parallel drive capability with independent strobe/enable timing, dual-cascadable serial outputs, open-drain output current rating of 40 mA per channel, and wide-voltage CMOS compatibility across 5 V/10 V/15 V logic domains.

Technical Context

The HEF4894BT-Q100 implements a two-stage pipeline: a 12-bit serial-in shift register followed by a 12-bit storage latch. Data shifts on positive CP edges; STR pulse transfers all 12 bits from shift register to storage register simultaneously. Outputs QP0–QP11 reflect storage register state only when OE is HIGH - enabling precise timing control between data loading and display update.

QS1 delivers shifted-out data on each CP rising edge for high-speed daisy-chaining; QS2 provides the same data one clock phase later (on CP falling edge), accommodating slower clock rise times without added external delay. Both serial outputs support seamless multi-device expansion while maintaining deterministic timing alignment across the chain.

Key Specifications

Pinout & Package

HEF4894BT-Q100 is housed in a plastic small outline package (SO20, SOT163-1) with 20 leads and 7.5 mm body width. The package supports standard reflow soldering and offers adequate power dissipation (500 mW at ≤109 °C ambient) for LED driver duty cycles.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar shift-register LED driver applications.

Compared with TLC5916IDR and STP16DP05PTR, the HEF4894BT-Q100 uniquely combines AEC-Q100 qualification, dual-edge serial outputs for robust cascading, and strobe-gated latching - making it optimal for cost-sensitive, timing-critical automotive LED control where deterministic update synchronization is mandatory.

Availability

HEF4894BT-Q100 is available at Aetrix Electronics and suitable for automotive interior lighting, instrument cluster backlighting, center console indicators, and HVAC control panel LED applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for HEF4894BT-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 leading semiconductor manufacturer specializing in high-performance, high-reliability logic, analog, and discrete components, with deep expertise in automotive-grade silicon and rigorous AEC-Q100 qualification processes.

The HEF4894B-Q100 belongs to Nexperia's automotive logic portfolio designed specifically for robust serial-to-parallel conversion in harsh environment lighting control - emphasizing latch synchronization, ESD resilience, and wide-voltage interoperability.

FAQ

What is the maximum clock frequency supported by HEF4894BT-Q100?

The HEF4894BT-Q100 supports up to 28 MHz maximum clock frequency at 15 V supply, with typical propagation delays of 55 ns (CP to QPn). At 5 V, the maximum clock rate drops to 10 MHz due to slower internal switching. These values are specified in Table 7 of the datasheet and validated across the full −40 °C to +125 °C operating range.

Can HEF4894BT-Q100 drive LEDs directly without external current-limiting resistors?

No - while the HEF4894BT-Q100 provides 40 mA sink capability per QPn output, external series resistors are required to set precise LED current and ensure consistent brightness across voltage and temperature variations. The device does not regulate current; it acts as a controlled switch to ground.

How does the dual serial output (QS1/QS2) improve system reliability in cascaded configurations?

QS1 delivers data on CP rising edges for fast-clock systems; QS2 delivers identical data on the subsequent falling edge. This allows designers to select the output that aligns with their clock's edge integrity - avoiding setup/hold violations when clock rise time degrades due to PCB trace length or noise, thereby eliminating bit errors in long daisy chains.

Is there a recommended minimum pulse width for the STR signal?

Yes - the datasheet specifies a minimum STR HIGH pulse width of 12 ns at 15 V (Table 7). At lower supply voltages, the required width increases slightly due to slower internal logic; at 5 V, it is 30 ns. Meeting this ensures complete transfer of all 12 bits from shift register to storage latch without metastability.