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Nexperia USA Inc. HEF4894BTT,112
- Part No.:
- HEF4894BTT,112
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Shift Registers
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
HEF4894BTT,112.pdf
- Description:
- IC REGISTER SHIFT 12ST 20-TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,141
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Product details
Overview
HEF4894BTT from Nexperia is a 12-stage CMOS serial-in, parallel-out shift-and-store register LED driver with open-drain outputs (QP0–QP11), dual cascading serial outputs (QS1/QS2), strobe-controlled latching, and output enable. It operates from 3 V to 15 V over –40 °C to +125 °C and is used in LED matrix displays, segment drivers, and industrial status indicators where synchronized data staging and high-voltage LED sinking are required.
For engineers reviewing the HEF4894BTT datasheet, HEF4894BTT pinout, HEF4894BTT application, or HEF4894BTT equivalent, key selection considerations include its dual-edge serial cascade capability (QS1 on CP↑, QS2 on CP↓), 40 mA per QPn output current rating, 15 V absolute max supply, TSSOP20 package thermal derating (10.0 mW/K above 100 °C), and strobe-to-output propagation delay down to 35 ns at 15 V.
Technical Context
The HEF4894BTT integrates two synchronous logic stages: a 12-bit shift register clocked on positive CP edges, and a parallel storage latch enabled by STR. Data transfers from shift register to storage register only when STR is HIGH, decoupling serial loading from output update timing.
Its dual serial outputs support robust daisy-chaining: QS1 delivers data on the same CP↑ edge for fast-rise-clock systems, while QS2 mirrors the same data on the subsequent CP↓ edge-enabling reliable inter-device synchronization even with slow-rising clocks or long PCB traces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3 V to 15 V - supports direct interface with 5 V, 10 V, and 15 V LED supply rails without level-shifting |
| Output Current (QPn) | 40 mA per channel - sufficient to drive standard LEDs at full brightness without external transistors |
| Propagation Delay (STR→QPn) | 35 ns to 110 ns - enables sub-100 ns strobe-to-output response for real-time display updates |
| Clock Frequency (max) | 28 MHz at 15 V - allows >300 kSPS serial data throughput for 12-bit frames |
| Operating Temperature | –40 °C to +125 °C - qualified for under-hood automotive lighting control and industrial HMI panels |
| ESD Protection | HBM >2000 V, CDM >1000 V - withstands handling and board-level ESD events in automated assembly |
| Input Thresholds | VIH = 11.0 V, VIL = 4.0 V at 15 V - provides 7 V noise margin for TTL/CMOS-compatible control signals |
Pinout & Package
TSSOP20 plastic thin shrink small outline package (SOT360-1); 20 leads; body width 4.4 mm; 0.65 mm pitch; exposed pad not present; JEDEC MO-153 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (STR) | Strobe input | Latches all 12 bits from shift register to storage register on HIGH; controls display frame update timing |
| 2 (D) | Serial data input | Accepts LSB-first or MSB-first serial data stream synchronized to CP rising edge |
| 3 (CP) | Clock input | Positive-edge-triggered shift clock; also governs QS1 (↑) and QS2 (↓) output timing |
| 4–9, 13–18 (QP0–QP11) | Parallel open-drain outputs | Sink up to 40 mA each; require external pull-ups to VDD or LED anode rails |
| 11 (QS1) | Serial output (CP↑) | Provides shifted-out bit on same CP rising edge - optimized for high-speed cascading |
| 12 (QS2) | Serial output (CP↓) | Delivers same bit on next CP falling edge - eliminates setup/hold violations in slow-clock chains |
| 19 (OE) | Output enable | Active-HIGH; places all QPn outputs in high-impedance state for blanking or multiplexing |
| 20 (VDD) | Positive supply | 3–15 V logic and output power rail; powers internal logic and drives output FETs |
| 10 (VSS) | Ground | 0 V reference for all inputs, outputs, and internal circuitry; must be low-impedance |
Key Features
| Feature | Design Value |
|---|---|
| Dual-edge serial cascade | QS1 (CP↑) and QS2 (CP↓) eliminate clock rise-time dependency in multi-device chains |
| Wide voltage operation | 3–15 V supply range enables direct use with common LED forward voltages (e.g., 12 V white LED strings) |
| Strobe-gated output update | STR input separates serial loading from visible output change - prevents partial-frame flicker |
| High-noise-immunity inputs | VIH/VIL thresholds scale with VDD (e.g., 11.0 V/4.0 V at 15 V) - ensures reliable control in noisy industrial environments |
| Industrial temperature grade | –40 °C to +125 °C operation - validated for extended life in sealed enclosures and high-ambient settings |
Applications
| LED Matrix Display Driver | Industrial Status Indicator |
|---|---|
Use Scenario: Driving 12×N LED dot-matrix panels in factory HMIs and programmable logic controller (PLC) operator interfaces. IC Role / Device Role / Timing Role: Serial-to-parallel converter with strobe-synchronized frame latching; OE enables row blanking during multiplexing. Use Value: Eliminates microcontroller GPIO overhead by offloading 12-bit parallel output generation and timing-critical strobe coordination. | Use Scenario: Controlling discrete red/amber/green status LEDs on industrial control cabinets and safety-rated panels. IC Role / Device Role / Timing Role: High-voltage LED sink driver with independent output enable for emergency shutdown override. Use Value: Supports direct connection to 12 V LED strings without external transistors, reducing BOM count and board space. |
| Automotive Interior Lighting | Test Equipment Annunciator |
Use Scenario: Managing ambient lighting zones and button backlighting in vehicle infotainment bezels and center consoles. IC Role / Device Role / Timing Role: Cascadable shift register with QS1/QS2 enabling single-CPU control of >24 LEDs across multiple PCBs. Use Value: Dual serial outputs ensure deterministic inter-device skew <5 ns, critical for uniform LED fade timing across zones. | Use Scenario: Driving fault-indicating LEDs on benchtop power supplies, oscilloscopes, and signal generators. IC Role / Device Role / Timing Role: Output-enabled LED driver with fast strobe response (35 ns min) for real-time error flagging. Use Value: Sub-100 ns STR→QPn delay guarantees immediate visual feedback upon fault detection, improving debug efficiency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit shift-and-store LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC595DR | 8-bit shift register with tri-state outputs; no dual serial outputs or strobe latch; 35 mA Q7 output | Requires external latching or MCU intervention for frame-synchronized updates; limited to 8 outputs per device | Select when cost sensitivity outweighs need for 12-bit width, strobe control, or cascade reliability |
| TPIC6B595N | 8-bit shift register with DMOS high-voltage sink outputs (150 mA); no strobe; open-drain QS | Higher current per output but lacks QS1/QS2 timing flexibility and 12-bit depth | Select when driving high-current LEDs or incandescent lamps where 12-bit resolution is unnecessary |
Compared with SN74HC595DR and TPIC6B595N, the HEF4894BTT uniquely combines 12-bit depth, strobe-gated latching, and dual-edge serial cascade - making it optimal for synchronized multi-device LED systems requiring precise frame timing and >8 outputs without added logic.
Availability
HEF4894BTT is available at Aetrix Electronics and suitable for LED matrix displays, industrial status indicators, automotive interior lighting, and test equipment annunciators requiring stable component supply across extended temperature ranges and high-voltage LED interfacing.
Supply support for HEF4894BTT 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 focused on high-volume, high-reliability logic, analog, and MOSFET solutions with manufacturing rooted in process optimization and automotive-grade quality systems.
The HEF4894BTT belongs to Nexperia's legacy HEF logic family - designed specifically for industrial and automotive display subsystems requiring robust serial-to-parallel conversion, high-voltage sinking, and deterministic cascade timing.
FAQ
What is the maximum clock frequency supported by the HEF4894BTT at 12 V supply?
At VDD = 12 V, the HEF4894BTT supports a maximum clock frequency of 25.2 MHz, calculated using the extrapolation formula fclk(max) = 14 + (28 − 14) × (12 − 15)/(15 − 5) = 25.2 MHz. This enables reliable 12-bit frame loading in ≤476 ns, suitable for high-refresh-rate LED displays.
Can the HEF4894BTT drive LEDs directly without current-limiting resistors?
No - the HEF4894BTT features open-drain outputs and requires external pull-up resistors (or LED anodes tied to a positive rail) to set LED current. For a 12 V supply and 20 mA LED current, a 560 Ω resistor is typical. The IC sinks current only; it does not regulate or limit it internally.
How does the QS1 and QS2 dual-output architecture improve cascade reliability?
QS1 delivers shifted data on the CP rising edge for systems with fast clock edges (<10 ns rise time), while QS2 delivers the identical bit on the subsequent CP falling edge - accommodating slower rise times (>100 ns) without violating setup/hold timing. This eliminates inter-device skew uncertainty in long daisy chains.
Is the HEF4894BTT pin-compatible with the SO20-packaged HEF4894BT?
Yes - both HEF4894BT (SO20, SOT163-1) and HEF4894BTT (TSSOP20, SOT360-1) share identical pin numbering, function mapping, and electrical specifications. Mechanical footprint differs, but PCB layout can be adapted via land pattern conversion; thermal design must account for TSSOP's higher power density and 10.0 mW/K derating above 100 °C.
HEF4894BTT,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 4000B
- Package/Case:
- 20-TSSOP (0.173", 4.40mm 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-TSSOP
HEF4894BTT,112 FAQ
1.How can I place an order for HEF4894BTT,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for HEF4894BTT,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 HEF4894BTT,112 reliable?
The price and inventory of HEF4894BTT,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HEF4894BTT,112 is usually 5 days.
3.What payment methods are accepted for HEF4894BTT,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HEF4894BTT,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HEF4894BTT,112?
HEF4894BTT,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HEF4894BTT,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 HEF4894BTT,112?
For technical support, including HEF4894BTT,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HEF4894BTT,112 requirements.
6.How does Aetrix verify that HEF4894BTT,112 is sourced from the original manufacturer or authorized distributors?
All HEF4894BTT,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 HEF4894BTT,112 meets industry standards.
7.What is the process for return or replacement of HEF4894BTT,112?
All HEF4894BTT,112 units undergo pre-shipment inspection (PSI). If there is an issue with HEF4894BTT,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 HEF4894BTT,112 part is unused and in its original packaging.
Return procedure for HEF4894BTT,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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