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Nexperia USA Inc. HEF4794BT,118
- Part No.:
- HEF4794BT,118
- Manufacturer:
- Nexperia USA Inc.
- Category:
- LED Drivers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
HEF4794BT,118.pdf
- Description:
- IC LED DRIVER LINEAR 40MA 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,087
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Product details
Overview
HEF4794BT,118 from Nexperia is an 8-stage CMOS serial-in/parallel-out shift-and-store register with open-drain LED driver outputs (QP0–QP7), dual serial outputs (QS1/QS2), strobe-controlled latching, and output enable (OE). It operates from 3 V to 15 V, supports -40 °C to +125 °C ambient, and delivers 40 mA per output. It is used in LED matrix drivers, segment displays, and industrial status indicators where cascaded serial-to-parallel conversion is required.
For engineers reviewing the HEF4794BT,118 datasheet, HEF4794BT,118 pinout, HEF4794BT,118 application, or HEF4794BT,118 equivalent, key selection criteria include its dual-edge serial cascade capability (QS1 on CP↑, QS2 on CP↓), wide VDD range enabling direct 5 V/12 V system integration, open-drain output flexibility for common-anode LED configurations, and guaranteed operation up to 28 MHz at 15 V.
Technical Context
The HEF4794BT,118 implements a two-stage pipeline: an 8-bit shift register followed by an 8-bit storage latch, both clocked by CP and controlled independently by STR. Data shifts on each rising edge of CP; STR high transfers all 8 bits from shift register to latch simultaneously, decoupling data loading from output update timing.
Its dual serial outputs serve distinct signal integrity roles: QS1 provides low-latency forwarding for fast-rising clocks, while QS2 offers phase-aligned cascading for slow-rising clocks-enabling robust daisy-chaining across mixed-slew-rate systems without external delay compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3 V to 15 V - Enables direct interface with 5 V microcontrollers, 12 V industrial rails, and legacy 15 V logic without level-shifting. |
| Output Drive Capability | 40 mA per QPn output - Sufficient to directly drive standard 20 mA LEDs or interface with external MOSFETs for higher-current loads. |
| Maximum Clock Frequency | 28 MHz at VDD = 15 V - Supports high-speed serial data loading for real-time display updates or rapid configuration changes. |
| Propagation Delay (CP to QPn) | 55 ns to 120 ns (VDD = 15 V) - Ensures deterministic timing for synchronized multi-device LED refresh cycles. |
| Operating Temperature | -40 °C to +125 °C - Qualified for under-hood automotive lighting control, industrial HMIs, and outdoor signage applications. |
| ESD Protection | HBM > 2000 V, CDM > 1000 V - Robust handling during PCB assembly and field service without additional protection circuitry. |
| Input Thresholds | VIL ≤ 4.0 V, VIH ≥ 11.0 V at VDD = 15 V - Provides wide noise margin for reliable operation in electrically noisy environments. |
Pinout & Package
HEF4794BT,118 is housed in a 16-pin SO16 plastic small outline package (SOT109-1), 3.9 mm body width, surface-mount compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (STR) | Strobe input | Latches all 8 bits from shift register into output storage register on HIGH; enables synchronous parallel output update. |
| 2 (D) | Serial data input | Accepts LSB-first serial data stream; sampled on each rising edge of CP. |
| 3 (CP) | Clock input | Rising edge shifts data; falling edge has no effect on shift register but triggers QS2 output. |
| 4–7, 11–14 (QP0–QP7) | Parallel open-drain outputs | Drive LEDs or external transistors; require external pull-up; support common-anode configurations. |
| 9 (QS1) | Primary serial output | Outputs shifted data on CP rising edge - optimized for high-speed cascading with fast-clock systems. |
| 10 (QS2) | Secondary serial output | Outputs same data on CP falling edge - eliminates setup/hold violations when clock rise time exceeds 100 ns. |
| 15 (OE) | Output enable | Active-HIGH; disables all QPn outputs to high-impedance state for dynamic blanking or bus sharing. |
| 8 (VSS) | Ground reference | 0 V return path; must be low-inductance connection to minimize ground bounce during simultaneous output switching. |
| 16 (VDD) | Positive supply | 3–15 V power rail; bypass capacitor (100 nF) recommended near pin for stable operation. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-edge serial cascade outputs | QS1 (CP↑) and QS2 (CP↓) eliminate clock slew dependency in multi-device chains - no external delay elements needed. |
| Wide VDD operating range | 3 V to 15 V allows single-supply operation across 5 V MCU systems, 12 V industrial panels, and legacy 15 V backplanes. |
| Open-drain parallel outputs | Each QPn sinks up to 40 mA - supports direct LED driving, high-side switch control, or wired-OR logic implementation. |
| Strobe-synchronized latching | STR input decouples serial loading from output visibility - enables glitch-free display updates and precise timing control. |
| Industrial temperature grade | -40 °C to +125 °C operation - qualified for use in motor control HMI, railway signaling, and outdoor kiosk electronics. |
Applications
| LED Matrix Display Driver | Industrial Status Indicator Panel |
|---|---|
Use Scenario: Driving 8×8 monochrome LED matrices in embedded control panels using SPI-compatible serial data. IC Role / Device Role / Timing Role: Shift-and-store register converts microcontroller SPI output into parallel column/row enable signals; STR synchronizes full-frame updates. Use Value: Eliminates need for 64 GPIOs; QS2 ensures reliable cascading across multiple panels even with slow-rising system clocks. |
Use Scenario: Controlling 16 discrete status LEDs (e.g., fault, ready, active, alarm) on factory-floor PLC I/O modules. IC Role / Device Role / Timing Role: LED driver with OE pin enables dynamic blinking via PWM on OE, while STR allows batch reconfiguration without flicker. Use Value: 40 mA per output drives high-brightness LEDs directly; 125 °C rating ensures reliability inside sealed enclosures. |
| Segmented Alphanumeric Display | Automotive Interior Lighting Control |
Use Scenario: Driving 7-segment + decimal point digits in HVAC or instrument cluster displays. IC Role / Device Role / Timing Role: Serial interface reduces wiring count; open-drain outputs interface with common-anode digit drivers. Use Value: Dual QS outputs allow daisy-chaining to drive multiple digits with one SPI line; VDD range accommodates 5 V MCU and 12 V backlight supplies. |
Use Scenario: Controlling ambient LED strips and button backlights in vehicle door modules and center consoles. IC Role / Device Role / Timing Role: Shift register sequences lighting patterns; OE enables synchronized dimming via external PWM controller. Use Value: -40 °C to +125 °C rating meets automotive under-dash thermal requirements; ESD robustness withstands assembly and service handling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit shift-and-store LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC595DR | Push-pull outputs (not open-drain); no QS2 output; max VDD = 6 V; 35 mA per output. | Suitable only for 5 V systems; requires external pull-ups for common-anode LED use; no slow-clock cascade support. | Select when cost is primary and system uses 5 V logic with common-cathode LEDs. |
| TPIC6B595N | High-voltage DMOS outputs (up to 50 V); 150 mA per output; no QS2; wider VDD (4.5–5.5 V only). | Designed for high-side LED strings or solenoid drivers; not pin-compatible; lacks dual-edge cascade capability. | Select when driving 24 V LED arrays or needing >100 mA per channel; not suitable for low-voltage or cascade-critical designs. |
Compared with SN74HC595DR and TPIC6B595N, the HEF4794BT,118 uniquely combines open-drain flexibility, dual-edge serial cascade, and 3–15 V operation - making it the only choice for robust, voltage-agile, multi-device LED control in industrial and automotive-adjacent applications.
Availability
HEF4794BT,118 is available at Aetrix Electronics and suitable for LED matrix displays, industrial status panels, segmented alphanumeric interfaces, and automotive interior lighting requiring stable component supply across extended temperature and voltage ranges.
Supply support for HEF4794BT,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 components for automotive, industrial, mobile, and computing markets, with leadership in logic, analog, and discrete devices.
The HEF4794BT,118 belongs to Nexperia's legacy HEF logic family, designed specifically for robust serial-to-parallel conversion in LED-driven human-machine interfaces and industrial control systems.
FAQ
What is the maximum capacitive load the HEF4794BT,118 can drive on its QPn outputs?
The HEF4794BT,118 does not specify a maximum capacitive load limit for QPn outputs in its datasheet. However, dynamic characteristics tables show timing parameters tested up to 50 pF load capacitance, and output current capability remains stable up to 40 mA per pin. For loads exceeding 50 pF, propagation delays increase linearly per the CL-dependent formulas in Table 7 - design verification with actual board parasitics is recommended.
Can the HEF4794BT,118 operate reliably with a 3.3 V microcontroller SPI interface?
Yes - at VDD = 3.3 V, the HEF4794BT,118 meets VIH ≥ 2.31 V and VIL ≤ 1.0 V (per Table 6 extrapolation), fully compatible with standard 3.3 V CMOS logic levels. Its minimum VDD of 3 V and guaranteed operation down to -40 °C ensure robust interfacing without level shifters in battery-powered or low-power embedded systems.
How does the QS1/QS2 dual-output architecture improve system-level timing margin?
QS1 (CP↑) and QS2 (CP↓) provide identical serial data on complementary clock edges, allowing designers to select the output that aligns with their clock's dominant edge transition. This eliminates setup/hold violations in cascaded systems where clock rise time exceeds 100 ns - removing the need for external delay lines or clock conditioning circuits and simplifying PCB layout.
Is the HEF4794BT,118 suitable for automotive applications?
The HEF4794BT,118 is rated for -40 °C to +125 °C and meets JEDEC JESD13-B, but Nexperia explicitly states it is "non-automotive qualified" in its legal disclaimers. It lacks AEC-Q100 qualification, automotive-specific reliability testing, and PPAP documentation. Use in automotive applications is at the customer's own risk and requires full system-level validation.
HEF4794BT,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Linear
- Topology:
- Shift Register
- Internal Switch(s):
- Yes
- Number of Outputs:
- 8
- Voltage - Supply (Min):
- 3V
- Voltage - Supply (Max):
- 15V
- Voltage - Output:
- -
- Current - Output / Channel:
- 40mA
- Frequency:
- 28MHz
- Dimming:
- -
- Applications:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
HEF4794BT,118 FAQ
1.How can I place an order for HEF4794BT,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for HEF4794BT,118 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 HEF4794BT,118 reliable?
The price and inventory of HEF4794BT,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HEF4794BT,118 is usually 5 days.
3.What payment methods are accepted for HEF4794BT,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HEF4794BT,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HEF4794BT,118?
HEF4794BT,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HEF4794BT,118 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 HEF4794BT,118?
For technical support, including HEF4794BT,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HEF4794BT,118 requirements.
6.How does Aetrix verify that HEF4794BT,118 is sourced from the original manufacturer or authorized distributors?
All HEF4794BT,118 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 HEF4794BT,118 meets industry standards.
7.What is the process for return or replacement of HEF4794BT,118?
All HEF4794BT,118 units undergo pre-shipment inspection (PSI). If there is an issue with HEF4794BT,118, 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 HEF4794BT,118 part is unused and in its original packaging.
Return procedure for HEF4794BT,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
HEF4794BT,118 Tags
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BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
Infineon Technologies
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BCR420UE6327HTSA1
Infineon Technologies
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BCR421UE6327HTSA1
Infineon Technologies
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LYT1604D-TL
Power Integrations
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HV9910CLG-G
Microchip Technology
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CL2N8-G
Microchip Technology
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BCR420UW6-7
Diodes Incorporated
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BCR421UW6-7
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BCR420UFD-7
Diodes Incorporated
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BCR421UFD-7
Diodes Incorporated
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