Nexperia USA Inc. HEF4894BT,118

Overview

HEF4894BT,118 from Nexperia is a 12-stage CMOS serial-in/parallel-out shift-and-store register with open-drain LED driver outputs (QP0–QP11), dual cascading serial outputs (QS1/QS2), strobe-controlled latch transfer, 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-time clock cascading via QS1 (positive-edge) and QS2 (negative-edge). Used in LED matrix drivers and serial-to-parallel data conversion for industrial displays.

For engineers reviewing the HEF4894BT,118 datasheet, HEF4894BT,118 pinout, HEF4894BT,118 application, or HEF4894BT,118 equivalent, key selection criteria include its dual-edge serial cascade capability, 12-bit storage latch timing, open-drain output drive strength (40 mA per QPn), wide VDD range (3–15 V), and SO20 package compatibility with legacy PCB footprints.

Technical Context

The HEF4894BT implements a two-stage pipeline: a 12-bit shift register accepting serial data on CP rising edges, followed by a parallel storage register loaded synchronously when STR is HIGH. Data remains latched until the next STR pulse, decoupling shift timing from display update timing.

Its dual serial outputs provide architectural flexibility: QS1 delivers shifted data on CP↑ for fast-clock systems, while QS2 mirrors the same data on CP↓-enabling reliable daisy-chaining even with slow-rising clocks. All 12 QPn outputs are open-drain, requiring external pull-ups for LED anode driving or logic-level translation.

Key Specifications

Pinout & Package

HEF4894BT,118 is housed in a plastic small outline package (SO20, SOT163-1) with 20 leads and 7.5 mm body width. Pin 1 is marked by a notch or dot; pin numbering follows standard counter-clockwise convention from top-left corner.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit shift-and-store LED driver applications.

Compared with TLC5916IDR and STP16DP05PTR, HEF4894BT,118 offers deterministic strobe-synchronized output updates, zero-config serial cascade, and direct 3–15 V compatibility - making it optimal for cost-sensitive, timing-critical, or thermally demanding LED driver applications where constant-current precision is secondary to timing control and supply flexibility.

Availability

HEF4894BT,118 is available at Aetrix Electronics and suitable for industrial HMIs, automotive interior lighting, POS terminal backlighting, and LED matrix signage requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for HEF4894BT,118 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 delivering high-performance, reliable, and energy-efficient logic, analog, and MOSFET solutions for automotive, industrial, and consumer markets.

The HEF4894B belongs to Nexperia's legacy CMOS logic portfolio designed for robust serial-to-parallel data conversion in LED-driven human-machine interfaces, emphasizing latch-controlled timing, wide supply tolerance, and cascading flexibility.

FAQ

What is the maximum sink current per QPn output, and how is it affected by supply voltage?

The HEF4894BT,118 specifies a maximum output current of 40 mA per QPn pin across the full –40 °C to +125 °C range and 3–15 V VDD. This rating is independent of supply voltage - confirmed in Table 4 (Limiting Values) and Table 6 (Static Characteristics) where IOL min = 4.2 mA @ 15 V, 10 V, and 5 V with VO = 1.5 V and |IO| < 20 mA. Derating is not required within recommended operating conditions.

Can QS1 and QS2 be used simultaneously in the same cascade chain?

No - QS1 and QS2 deliver identical serial data but on opposite clock edges (QS1 on CP↑, QS2 on CP↓). Using both in one chain would cause timing misalignment and data corruption. The datasheet explicitly positions them as alternatives: QS1 for fast-rising clocks, QS2 for slow-rising clocks. Select one based on system clock slew rate, not both.

How does the strobe (STR) input interact with ongoing serial shifting?

STR operates independently of CP and D. While serial data shifts into the 12-stage register on every CP↑, STR controls only the transfer from shift register to storage latch. When STR goes HIGH, all 12 bits present in the shift register are copied to the latch simultaneously - freezing the output state until the next STR pulse, regardless of further CP activity.

Is the HEF4894BT,118 suitable for automotive applications?

Yes - the HEF4894BT,118 is qualified for –40 °C to +125 °C operation (per Table 1 Ordering Information), features >2000 V HBM ESD protection, and meets JEDEC JESD13-B. Though not AEC-Q100 certified, its parametric ratings and thermal performance align with non-safety-critical automotive interior lighting and indicator applications where customer validation is performed.