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Nexperia USA Inc. HEF4894BT,112
- Part No.:
- HEF4894BT,112
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Shift Registers
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
HEF4894BT,112.pdf
- Description:
- IC REGISTER SHIFT 12STAGE 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:151
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Product details
Overview
HEF4894BT,112 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 is used in LED matrix drivers, segment displays, and industrial status indicators requiring synchronized data latching and high-voltage drive capability.
For engineers reviewing the HEF4894BT,112 datasheet, HEF4894BT,112 pinout, HEF4894BT,112 application, or HEF4894BT,112 equivalent, key selection considerations include its dual-edge cascading outputs (QS1 on CP↑, QS2 on CP↓), 12-bit storage latch timing, open-drain output current rating (40 mA per QPn), wide supply range, and SO20 package compatibility with legacy 4000-series logic footprints.
Technical Context
The HEF4894BT implements a two-stage pipeline: a 12-bit serial shift register followed by a parallel storage register. Data shifts on each positive CP edge and transfers to the storage register when STR is HIGH - decoupling serial loading from output update. This enables asynchronous data streaming and synchronous display refresh.
Its dual serial outputs support both fast-rise (QS1) and slow-rise (QS2) clock environments for reliable daisy-chaining. All 12 QPn outputs are open-drain, allowing direct connection to LEDs with external pull-ups or higher-voltage supplies up to 15 V, while OE provides global output disable with sub-100 ns enable/disable timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | 12-stage shift-and-store register with open-drain LED driver outputs |
| Supply Voltage Range | 3 V to 15 V - supports mixed-voltage systems and direct LED anode biasing |
| Output Type | Open-drain QP0–QP11 - enables high-side LED switching with external pull-up to up to 15 V |
| Max Clock Frequency | 28 MHz at VDD = 15 V - allows >300 kSPS serial load rate for full 12-bit update |
| Propagation Delay (CP→QPn) | 55–120 ns at VDD = 15 V - ensures tight timing control for synchronized multi-device displays |
| Strobe Pulse Width (STR) | Minimum 12 ns at VDD = 15 V - permits short, glitch-immune latch strobes in high-speed systems |
| Operating Temperature | –40 °C to +125 °C - qualified for under-hood, industrial control, and power-conversion environments |
Pinout & Package
HEF4894BT,112 is packaged in SO20 (SOT163-1): plastic small outline, 20-pin, 7.5 mm body width, standard JEDEC MS-013 footprint compatible with legacy 4000B-series layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (STR) | Strobe input | Transfers all 12 bits from shift register to storage latch on HIGH level; enables synchronous output update |
| 2 (D) | Serial data input | Accepts CMOS-level serial data; shifted into stage 0 on each CP↑ transition |
| 3 (CP) | Positive-edge clock | Drives internal shift register; rising edge advances data one stage and updates QS1 |
| 4–9, 13–18 (QP0–QP11) | Parallel open-drain outputs | 12 individually controllable outputs; sink up to 40 mA each; require external pull-up for LED drive |
| 11 (QS1) | Primary serial output | Outputs Q10S on CP↑ - optimized for fast-clock cascading (e.g., ≥10 MHz systems) |
| 12 (QS2) | Secondary serial output | Outputs Q11S on CP↓ - compensates for slow clock rise times in long daisy chains |
| 19 (OE) | Output enable | Active-HIGH; places all QPn outputs in high-impedance state within ≤100 ns |
| 10 (VSS) | Ground reference | 0 V return for logic and output stages; must be low-impedance for stable LED current sinking |
| 20 (VDD) | Power supply | 3–15 V CMOS supply; powers logic core and output drivers; decoupling required near pin |
Key Features
| Feature | Design Value |
|---|---|
| Dual-edge cascading outputs | QS1 (CP↑) and QS2 (CP↓) eliminate setup/hold violations in multi-device chains with varying clock slew rates |
| Wide voltage operation | 3–15 V supply supports direct interface with 3.3 V microcontrollers and 12 V LED arrays without level shifters |
| High-noise immunity | CMOS input thresholds (VIH ≥ 11 V @ 15 V, VIL ≤ 4 V @ 15 V) reject >4 V noise spikes on control lines |
| ESD robustness | HBM >2000 V and CDM >1000 V - reduces field failure risk in manual assembly and industrial handling |
| Temperature range | Specified from –40 °C to +125 °C - validated for automotive under-dash, motor drives, and outdoor signage |
Applications
| LED Matrix Display Driver | Industrial Status Indicator |
|---|---|
|
Use Scenario: Driving 12×N LED matrices in vending machines, HVAC panels, and programmable logic controllers. IC Role / Device Role / Timing Role: Serial-to-parallel converter with strobe-synchronized output update; QS1/QS2 enable daisy-chained expansion across multiple rows/columns. Use Value: Eliminates need for external latches and reduces MCU GPIO count by 12; open-drain outputs tolerate 12 V LED strings without external transistors. |
Use Scenario: Real-time status reporting via discrete LEDs on factory floor HMIs, power supply monitors, and safety interlock panels. IC Role / Device Role / Timing Role: Buffered output expander with OE-controlled blanking; STR synchronizes visual feedback to system events (e.g., fault detection). Use Value: Sub-100 ns OE response enables flicker-free LED blanking during fault transitions; 125 °C rating ensures reliability in enclosed enclosures. |
| Segmented Display Controller | Programmable Logic I/O Expander |
|
Use Scenario: Driving 7-segment + decimal point digits in test equipment, multimeters, and bench power supplies. IC Role / Device Role / Timing Role: Shift-register-based digit multiplexing controller; QS2 supports chaining to drive multiple 4-digit displays from one SPI bus. Use Value: Dual serial outputs simplify firmware - no bit-banging required for display refresh; 15 V tolerance allows direct common-anode drive. |
Use Scenario: Adding 12 configurable digital outputs to microcontroller-based PLC modules and sensor gateways. IC Role / Device Role / Timing Role: General-purpose parallel output expander with strobe-gated update; OE enables safe hot-swap of output states during runtime. Use Value: 40 mA per output supports direct relay coil or optocoupler drive; wide VDD range simplifies integration with 5 V or 12 V backplanes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit shift-and-store register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HC595D,653 | 8-bit shift register with push-pull outputs; no QS2; max VDD = 6 V | Lacks dual-edge cascade and 12-bit depth; unsuitable for >6 V LED drive or large displays | Select only for 3.3/5 V systems needing basic 8-bit expansion without strobe synchronization |
| TLC59283DBQR | 16-bit constant-current LED driver; I²C interface; no serial cascade outputs | Provides precise current regulation but requires protocol stack; no native daisy-chain capability | Choose when uniform LED brightness is critical and microcontroller resources allow I²C overhead |
Compared with 74HC595D,653 and TLC59283DBQR, the HEF4894BT,112 uniquely combines 12-bit depth, dual-edge serial cascading, open-drain 15 V-tolerant outputs, and strobe-synchronized latching - making it optimal for high-reliability, multi-device LED display systems operating across wide voltage and temperature ranges.
Availability
HEF4894BT,112 is available at Aetrix Electronics and suitable for LED matrix displays, industrial HMI status indicators, segmented instrumentation displays, and programmable logic I/O expansion requiring stable component supply across extended temperature and voltage ranges.
Supply support for HEF4894BT,112 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 applications.
The HEF4894B belongs to Nexperia's legacy-compatible logic family, designed specifically for robust serial-to-parallel conversion in LED driving and industrial control systems where wide supply range, thermal resilience, and cascading flexibility are essential.
FAQ
What is the maximum sink current per QPn output, and how is it affected by temperature?
Each QPn output sinks up to 40 mA continuously at Tamb = 25 °C. At +125 °C, the absolute maximum remains 40 mA, but total power dissipation must stay within 500 mW (SO20 package), derating linearly above 109 °C. Derated output current per pin at +125 °C is ~25 mA assuming uniform load distribution and proper PCB copper area.
Can QS1 and QS2 be used simultaneously in the same daisy-chain configuration?
No - QS1 and QS2 serve complementary clock-slew scenarios, not concurrent operation. QS1 is intended for fast-rising clocks (≥10 ns rise time); QS2 for slow-rising clocks (≥100 ns). Using both in one chain causes timing misalignment. Select QS1 for high-speed systems and QS2 for long traces or RC-filtered clocks.
Is a pull-up resistor required on the OE pin, and what happens if it's left floating?
Yes - OE is active-HIGH and has CMOS input structure. If left floating, leakage currents may cause indeterminate output states or oscillation. Per datasheet Section 1, unused inputs must be tied to VDD, VSS, or another driven input. Tie OE to VSS for permanent output disable or to VDD for always-enabled operation.
How does the strobe (STR) signal interact with ongoing serial shifting?
STR operates independently of CP: while CP shifts new data into the shift register, STR captures the *current* 12-bit contents into the storage latch. This allows continuous serial loading (e.g., next frame data) while holding previous data stable on outputs - enabling seamless display refresh without visible tearing or glitches.
HEF4894BT,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 4000B
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Logic Type:
- Shift Register
- Output Type:
- Open Drain
- Number of Elements:
- 1
- Number of Bits per Element:
- 12
- Function:
- Serial to Parallel, Serial
- Voltage - Supply:
- 3V ~ 15V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
HEF4894BT,112 FAQ
1.How can I place an order for HEF4894BT,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for HEF4894BT,112 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for HEF4894BT,112 reliable?
The price and inventory of HEF4894BT,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HEF4894BT,112 is usually 5 days.
3.What payment methods are accepted for HEF4894BT,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HEF4894BT,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HEF4894BT,112?
HEF4894BT,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HEF4894BT,112 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for HEF4894BT,112?
For technical support, including HEF4894BT,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HEF4894BT,112 requirements.
6.How does Aetrix verify that HEF4894BT,112 is sourced from the original manufacturer or authorized distributors?
All HEF4894BT,112 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that HEF4894BT,112 meets industry standards.
7.What is the process for return or replacement of HEF4894BT,112?
All HEF4894BT,112 units undergo pre-shipment inspection (PSI). If there is an issue with HEF4894BT,112, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The HEF4894BT,112 part is unused and in its original packaging.
Return procedure for HEF4894BT,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
HEF4894BT,112 Tags
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Texas Instruments
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74HC165D,653
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