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Nexperia USA Inc. HEF4794BT/C4J
- Part No.:
- HEF4794BT/C4J
- Manufacturer:
- Nexperia USA Inc.
- Category:
- LED Drivers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
HEF4794BT/C4J.pdf
- Description:
- HEF4794B - 8-stage shift-and-sto
- Quantity:
- Payment:
- Shipping:
Inventory:37,500
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Product details
Overview
HEF4794BT/C4J 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 enables cascaded LED matrix control in industrial signage and display drivers.
For engineers reviewing the HEF4794BT/C4J datasheet, HEF4794BT/C4J pinout, HEF4794BT/C4J application, or HEF4794BT/C4J equivalent, key selection considerations include its dual-edge serial cascade capability (QS1 on CP↑, QS2 on CP↓), 40 mA per QPn output drive, 125 °C extended temperature rating, and SO16 package compatibility with legacy 4000-series logic footprints.
Technical Context
The HEF4794BT/C4J integrates two synchronized register stages: an 8-bit shift register clocked on CP rising edges, and a parallel storage latch triggered by STR high. Data propagates from D through all 8 stages before being captured into the storage register, decoupling shift timing from output update timing.
Its dual serial outputs provide hardware-level flexibility for clock rise-time compensation: QS1 delivers shifted data on CP↑ for fast-clock systems, while QS2 provides the same data on CP↓ for slow-rising clocks-enabling reliable daisy-chaining without external delay elements or clock inversion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage (VDD) | 3 V to 15 V - supports direct interface with 5 V, 10 V, and 15 V logic or LED supply rails without level shifting |
| Output current (QPn) | 40 mA per channel - drives standard LEDs directly without external transistors in low-density displays |
| Operating temperature | -40 °C to +125 °C - qualified for under-hood industrial control panels and outdoor signage |
| Propagation delay (CP to QPn) | 55 ns to 120 ns at VDD = 15 V - enables >8 MHz operation in static LED grid updates |
| Input transition rate | 0.08 μs/V at VDD = 15 V - tolerates slow microcontroller GPIO edges without added Schmitt triggers |
| ESD protection | HBM >2000 V, CDM >1000 V - robust against handling and board-level ESD in factory assembly |
Pinout & Package
HEF4794BT/C4J uses the SOT109-1 (SO16) plastic small outline package: 16-pin, 3.9 mm body width, 1.27 mm lead pitch, gull-wing leads, JEDEC MS-012 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (STR) | Strobe input | Latches all 8 bits from shift register to storage register on HIGH; controls synchronous output update timing |
| 2 (D) | Serial data input | Accepts bitstream for sequential loading; compatible with SPI, GPIO bit-banging, or UART TX via software framing |
| 3 (CP) | Clock input | Rising edge shifts data; internal synchronization ensures metastability immunity across VDD range |
| 4–7, 11–14 (QP0–QP7) | Parallel open-drain outputs | Sink up to 40 mA each; require external pull-up to VDD or LED anode rail; support common-anode LED matrices |
| 9 (QS1) | Serial output (CP↑) | Delivers stage-6 data on CP rising edge - used for high-speed cascading with minimal inter-device skew |
| 10 (QS2) | Serial output (CP↓) | Delivers stage-7 data on CP falling edge - eliminates need for inverted clock in slow-rise applications |
| 15 (OE) | Output enable | Active-HIGH; places QPn outputs in high-impedance state for dynamic blanking or shared bus isolation |
| 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 required near pin for stable operation across full voltage range |
Key Features
| Feature | Design Value |
|---|---|
| Dual-edge serial cascade | QS1 (CP↑) and QS2 (CP↓) eliminate clock inversion requirements and reduce inter-device timing jitter in multi-chip chains |
| Wide VDD range (3–15 V) | Enables direct use with 5 V microcontrollers and 12 V LED strings without regulators or level translators |
| Open-drain QPn outputs | Supports flexible LED anode configurations (common-anode matrices) and mixed-voltage interfacing via external pull-ups |
| Strobe-synchronized latching | Decouples data shifting (asynchronous to system clock) from output update (synchronous to STR), preventing partial-frame glitches |
| Extended temperature grade | -40 °C to +125 °C operation verified per JEDEC JESD22-A108 - suitable for uncooled industrial enclosures |
Applications
| Industrial LED Signage | Automated Test Equipment (ATE) Indicators |
|---|---|
|
Use Scenario: Driving 8×N LED character displays in factory HMIs where ambient temperature exceeds 85 °C. IC Role / Device Role / Timing Role: Serial-to-parallel converter with strobe-gated output update; isolates display refresh from microcontroller SPI timing jitter. Use Value: Eliminates frame tearing during rapid text updates by synchronizing all 8 outputs to a single STR pulse, even when shift clock varies. |
Use Scenario: Controlling status LEDs on modular ATE backplanes with mixed 3.3 V and 12 V supply domains. IC Role / Device Role / Timing Role: Level-shifting LED driver with open-drain outputs; OE enables shared bus arbitration between test modules. Use Value: Single device replaces discrete MOSFETs and level shifters, reducing BOM count and PCB area while supporting hot-swap-safe LED control. |
| Programmable Logic Controller (PLC) I/O Expansion | Legacy Instrument Panel Retrofits |
|
Use Scenario: Adding 8-channel LED status indicators to DIN-rail PLCs operating in 70 °C cabinet environments. IC Role / Device Role / Timing Role: Robust shift register with 125 °C qualification; QPn outputs sink PLC indicator LEDs directly from 24 V rails via external resistors. Use Value: Avoids derating concerns of standard 85 °C logic ICs, enabling long-term reliability without forced air cooling or thermal margin penalties. |
Use Scenario: Replacing obsolete 4094B in analog instrument clusters requiring LED backlighting with minimal board rework. IC Role / Device Role / Timing Role: Pin-compatible upgrade with identical SO16 footprint, enhanced ESD, and wider VDD tolerance. Use Value: Maintains legacy firmware and layout while improving noise immunity and eliminating external clamping diodes previously needed for 12 V operation. |
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; no 125 °C rating | Requires external pull-downs for common-anode LEDs; unsuitable for 12 V LED strings or high-temp enclosures | Select only for 5 V-only, low-temperature consumer designs where cost is primary and open-drain flexibility is unnecessary |
| TPIC6B595N | Higher output current (150 mA); 50 V output rating; no QS2; requires external 5 V logic supply for control inputs | Designed for high-power LED strips and solenoid drivers; lacks dual-edge cascade for precise timing-critical chaining | Choose when driving high-current loads (>40 mA) or needing 50 V fault tolerance; avoid if QS2-based skew reduction is required |
Compared with SN74HC595DR and TPIC6B595N, the HEF4794BT/C4J uniquely balances wide-voltage open-drain drive, dual-edge cascade, and extended temperature operation-making it optimal for industrial LED control where reliability, timing precision, and supply flexibility intersect.
Availability
HEF4794BT/C4J is available at Aetrix Electronics and suitable for industrial LED signage, automated test equipment indicators, and programmable logic controller I/O expansion requiring stable component supply across extended temperature ranges and mixed-voltage systems.
Supply support for HEF4794BT/C4J 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 essential efficiency technologies, delivering high-performance logic, discrete, and MOSFET solutions for automotive, industrial, and consumer markets.
The HEF4794BT/C4J belongs to Nexperia's legacy-compatible logic portfolio, designed specifically for robust, wide-supply LED driving in harsh environments where reliability and pin compatibility with older HEF/CD4000 series matter.
FAQ
What is the maximum clock frequency supported by HEF4794BT/C4J at 15 V supply?
At VDD = 15 V, the HEF4794BT/C4J supports a maximum clock frequency of 28 MHz, as specified in Table 7 of the datasheet. This value assumes CL ≤ 50 pF and accounts for propagation delays and setup/hold timing margins. Real-world achievable frequency depends on load capacitance and PCB routing inductance.
Can HEF4794BT/C4J drive LEDs directly without current-limiting resistors?
No. The QPn outputs are open-drain and rated for 40 mA absolute maximum sink current, but external current-limiting resistors are mandatory to set LED forward current and prevent damage. Resistor value is calculated using (VDD − VF_LED) / I_LED, where VF_LED is the LED forward voltage and I_LED is the desired current within the 40 mA limit.
How does the dual serial output (QS1 and QS2) improve daisy-chained system timing?
QS1 outputs data on CP rising edges for fast-clock systems, minimizing inter-device skew. QS2 outputs the same data on CP falling edges, allowing cascaded devices to sample data without requiring an inverted clock signal-reducing timing uncertainty and PCB routing complexity in systems with slow clock rise times.
Is HEF4794BT/C4J automotive-qualified?
No. The HEF4794BT/C4J is not automotive-qualified. It is rated for industrial temperature range (-40 °C to +125 °C) and complies with JEDEC standards for commercial and industrial applications, but it has not undergone AEC-Q100 stress testing or automotive-specific qualification procedures.
HEF4794BT/C4J Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- 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:
- General Purpose
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
HEF4794BT/C4J FAQ
1.How can I place an order for HEF4794BT/C4J through Aetrix?
Please submit a Request for Quotation (RFQ) for HEF4794BT/C4J 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/C4J reliable?
The price and inventory of HEF4794BT/C4J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HEF4794BT/C4J is usually 5 days.
3.What payment methods are accepted for HEF4794BT/C4J?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HEF4794BT/C4J transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HEF4794BT/C4J?
HEF4794BT/C4J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HEF4794BT/C4J 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/C4J?
For technical support, including HEF4794BT/C4J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HEF4794BT/C4J requirements.
6.How does Aetrix verify that HEF4794BT/C4J is sourced from the original manufacturer or authorized distributors?
All HEF4794BT/C4J 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/C4J meets industry standards.
7.What is the process for return or replacement of HEF4794BT/C4J?
All HEF4794BT/C4J units undergo pre-shipment inspection (PSI). If there is an issue with HEF4794BT/C4J, 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/C4J part is unused and in its original packaging.
Return procedure for HEF4794BT/C4J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
HEF4794BT/C4J Tags
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BCR402RE6327HTSA1
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BCR430UXTSA2
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BCR420UE6433HTMA1
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BCR420UE6327HTSA1
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BCR421UE6327HTSA1
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HV9910CLG-G
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CL2N8-G
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BCR420UW6-7
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BCR421UW6-7
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BCR420UFD-7
Diodes Incorporated
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BCR421UFD-7
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