Nexperia USA Inc. HEF4894BTT-Q100,11

Overview

HEF4894BTT-Q100 from Nexperia is a 12-stage automotive-qualified shift-and-store register LED driver in TSSOP20 package, operating from 3 V to 15 V supply, featuring dual serial outputs (QS1/QS2) for cascading, open-drain parallel outputs (QP0–QP11), and strobe-controlled latching for synchronized LED column driving in automotive instrument clusters.

For engineers reviewing the HEF4894BTT-Q100 datasheet, HEF4894BTT-Q100 pinout, HEF4894BTT-Q100 application, or HEF4894BTT-Q100 equivalent, key selection criteria include its AEC-Q100 Grade 1 qualification, -40 °C to +125 °C operation, dual-edge serial output timing (QS1 on CP↑, QS2 on CP↓), open-drain output current capability (40 mA per QPn), and strobe-enabled data hold integrity in noisy automotive environments.

Technical Context

This device implements a two-stage pipeline: a 12-bit serial shift register followed by a 12-bit storage latch, with independent control of shifting (CP), latching (STR), and output enable (OE). Data propagates through the shift register on each positive clock edge and transfers atomically to the storage register when STR is HIGH.

The dual serial outputs support flexible cascade topologies: QS1 delivers data on the same CP↑ edge for fast-rise-clock systems, while QS2 provides identical data on the subsequent CP↓ edge-enabling robust daisy-chaining under slow-rising clock conditions without added delay compensation.

Key Specifications

Pinout & Package

TSSOP20 package (SOT360-1), 20-pin plastic thin shrink small outline, body width 4.4 mm, pitch 0.65 mm, lead count 20, RoHS-compliant, moisture sensitivity level MSL3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC595QPWRQ1 and TPIC6B595N, the HEF4894BTT-Q100 uniquely combines 12-bit depth, AEC-Q100 Grade 1 qualification, dual-edge serial outputs for robust cascading, and strobe-synchronized latching-making it the only drop-in solution for automotive-grade, multi-segment LED display systems requiring deterministic timing and high-voltage operation.

Availability

HEF4894BTT-Q100 is available at Aetrix Electronics and suitable for automotive instrument clusters, HVAC displays, LED message signs, and central infotainment status indicators requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for HEF4894BTT-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 Dutch semiconductor manufacturer specializing in high-performance, high-reliability logic, analog, and discrete components for automotive, industrial, and consumer markets.

The HEF4894B-Q100 belongs to Nexperia's automotive-qualified logic portfolio, designed specifically for robust serial-to-parallel LED driving in harsh environments where AEC-Q100 compliance, wide voltage operation, and precise timing control are mandatory.

FAQ

What is the maximum clock frequency supported by HEF4894BTT-Q100?

The device supports up to 28 MHz maximum clock frequency at VDD = 15 V, with typical propagation delays of 55 ns (CP to QPn). At 5 V supply, fclk(max) drops to 10 MHz due to slower internal switching. These values are specified across the full -40 °C to +125 °C operating range and validated per AEC-Q100 stress testing protocols.

How does the dual serial output (QS1 and QS2) improve cascade reliability?

QS1 delivers shifted data on the rising edge of CP, while QS2 delivers the same data on the subsequent falling edge. This allows designers to select the output that aligns with their clock slew rate: QS1 for fast-rising clocks (minimizing inter-device skew), QS2 for slow-rising clocks (avoiding metastability in downstream CP inputs), ensuring deterministic timing across arbitrary chain lengths.

Can HEF4894BTT-Q100 drive LEDs directly without external components?

Yes-the 12 open-drain QPn outputs each support 40 mA sink current and tolerate up to 15 V, enabling direct connection to LED anodes supplied from 3–12 V rails. Only external current-limiting resistors are required; no external transistors or level shifters are needed for standard automotive LED configurations.

Is strobe (STR) functionality necessary for basic LED driving?

Yes-STR decouples data shifting from output updating. Without strobing, outputs change incrementally as bits shift through the register, causing visible glitches in multi-LED patterns. Asserting STR HIGH after full 12-bit load ensures all QPn outputs update simultaneously, which is essential for flicker-free segmented displays and clean LED matrix scanning.