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Nexperia USA Inc. 74HC594BQX
- Part No.:
- 74HC594BQX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Shift Registers
- Package:
- 16-VFQFN Exposed Pad
- Datasheet:
-
74HC594BQX.pdf
- Description:
- 74HC594BQ/SOT763/DHVQFN16
- Quantity:
- Payment:
- Shipping:
Inventory:1,491
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Product details
Overview
74HC594BQX from Nexperia is an 8-bit serial-in/parallel-out shift register with independent shift and storage registers, dual active-low reset inputs (SHR, STR), and cascading-capable serial output (Q7S). It operates from 2.0 V to 6.0 V, supports up to 100 MHz typical clock frequency, and delivers ±35 mA parallel output drive. It is used in LED matrix drivers and industrial I/O expansion where synchronized data latching and noise-immune serial control are required.
For engineers reviewing the 74HC594BQX datasheet, 74HC594BQX pinout, 74HC594BQX application, or 74HC594BQX equivalent, key selection criteria include independent SHCP/STCP timing control, 16-pin DHVQFN thermal performance, TTL-compatible 74HCT594BQX variant availability, and guaranteed operation across –40 °C to +125 °C.
Technical Context
The device implements two synchronous 8-stage registers: a shift register accepting serial data on SHCP rising edges and a storage register capturing shift register contents on STCP rising edges. This separation enables glitch-free parallel output updates without disrupting ongoing serial loading.
Both registers feature dedicated asynchronous active-low resets (SHR, STR), allowing independent clearing of shift or storage stages. Input clamp diodes permit safe interfacing with voltages exceeding VCC when used with current-limiting resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | 8-bit serial-in/parallel-out shift register with output latch and serial cascade capability |
| Supply Voltage Range | 2.0 V to 6.0 V - supports mixed-voltage system interfacing and battery-powered operation |
| Max Clock Frequency | 100 MHz (typical at VCC = 6.0 V) - enables high-speed data streaming in real-time control loops |
| Parallel Output Drive | ±35 mA per Qn pin - directly drives LEDs or logic inputs without external buffers |
| Operating Temperature | –40 °C to +125 °C - qualified for under-hood automotive and industrial motor control environments |
| ESD Protection | HBM >2000 V, CDM >1000 V - robust handling in automated assembly and field-replaceable modules |
| Propagation Delay | 14 ns (STCP to Qn, VCC = 6.0 V) - ensures tight timing margins in synchronous digital systems |
Pinout & Package
DHVQFN16 (SOT763-1) package: 2.5 × 3.5 × 0.85 mm body, 16-terminal no-lead thermal-enhanced quad flat design with exposed thermal pad (non-soldered by default).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Q0 | LSB parallel output - provides first bit of latched 8-bit data word |
| 2 | Q1 | Parallel output - stage 1 of storage register output |
| 3 | Q2 | Parallel output - stage 2 of storage register output |
| 4 | Q3 | Parallel output - stage 3 of storage register output |
| 5 | Q4 | Parallel output - stage 4 of storage register output |
| 6 | Q5 | Parallel output - stage 5 of storage register output |
| 7 | Q6 | Parallel output - stage 6 of storage register output |
| 8 | GND | Ground reference - return path for all internal logic and output currents |
| 9 | Q7S | Serial output - shifted-out MSB enables daisy-chaining to next 74HC594 |
| 10 | SHR | Shift register reset - active-low asynchronous clear of shift register only |
| 11 | SHCP | Shift clock input - rising edge loads DS and advances shift register |
| 12 | STCP | Storage clock input - rising edge transfers shift register to Q0–Q7 outputs |
| 13 | STR | Storage register reset - active-low asynchronous clear of Q0–Q7 latch only |
| 14 | DS | Serial data input - feeds LSB into shift register on each SHCP rising edge |
| 15 | Q7 | MSB parallel output - final bit of latched 8-bit data word |
| 16 | VCC | Supply voltage - powers both shift and storage logic sections |
Key Features
| Feature | Design Value |
|---|---|
| Independent clocks for shift and storage registers | Enables continuous serial loading while holding stable parallel outputs - critical for real-time display refresh |
| Separate active-low reset for each register | Allows selective clearing of shift pipeline or output latch without disturbing the other - simplifies error recovery |
| Clamp diode-equipped inputs | Permits direct connection to 5 V or 12 V control signals using series resistors - eliminates level-shifter ICs |
| 100 MHz typical maximum clock frequency | Supports >10 Mbps serial data rates - suitable for high-resolution LED scanning and fast GPIO expansion |
| –40 °C to +125 °C operating range | Validated for engine control units and power converter monitoring - no derating required at max ambient |
Applications
| LED Matrix Driver | Industrial I/O Expander |
|---|---|
Use Scenario: Driving 8×8 monochrome LED displays in embedded signage and HMI panels. IC Role / Device Role / Timing Role: Serially receives pixel data from MCU, latches full row/column values on STCP, and sources/sinks current via Q0–Q7 outputs. Use Value: Eliminates 8-bit parallel bus routing; single SHCP/STCP pair synchronizes display update with minimal MCU GPIO usage. |
Use Scenario: Adding isolated digital outputs to PLC backplanes or sensor interface modules. IC Role / Device Role / Timing Role: Shifts command bits from SPI interface, holds steady output states during bus arbitration, and resets outputs independently via STR. Use Value: Provides deterministic output hold time during communication gaps - prevents spurious actuator activation. |
| Remote Control Decoder Buffer | Test Fixture Pattern Generator |
Use Scenario: Holding decoded IR remote commands in consumer audio/video receivers before execution. IC Role / Device Role / Timing Role: Captures serial NEC or RC-5 protocol bits via DS/SHCP, stores complete command byte in storage register, and presents it as parallel Q0–Q7. Use Value: Decouples slow IR demodulation timing from fast CPU interrupt response - avoids missed command capture. |
Use Scenario: Generating precise stimulus patterns for ASIC validation and board-level functional test. IC Role / Device Role / Timing Role: Loaded with precomputed test vectors via microcontroller UART-to-SPI bridge, then clocked out synchronously to DUT pins. Use Value: Delivers sub-15 ns edge alignment between Qn outputs - meets setup/hold requirements for high-speed digital interfaces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit shift-and-latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HCT594BQX | TTL-compatible input thresholds (VIH = 2.0 V min); identical pinout and function | Better interoperability with legacy 5 V microcontrollers lacking CMOS-level outputs | Select when driving from standard 5 V logic families without level translation |
| SN74HC595QPWRQ1 | Automotive-grade (AEC-Q100 Grade 1); same functionality but different pin 10 (OE instead of SHR) | Lacks independent shift register reset; requires external logic for full reset isolation | Choose for automotive infotainment displays requiring qualification, accepting reduced reset flexibility |
Compared with 74HCT594BQX, the TTL input version eases integration with older controllers, while SN74HC595QPWRQ1 trades reset independence for automotive qualification - neither offers the exact combination of dual-reset, wide VCC, and industrial temperature range found in the 74HC594BQX.
Availability
74HC594BQX is available at Aetrix Electronics and suitable for LED display drivers, industrial I/O expanders, and remote control buffer circuits requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74HC594BQX 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, and consumer applications, with leadership in logic, discrete, and MOSFET technologies.
The 74HC594 belongs to Nexperia's HC logic family - designed for low-power, high-noise-immunity digital interfacing in space-constrained and thermally demanding environments.
FAQ
What is the difference between SHCP and STCP in the 74HC594BQX?
SHCP (shift clock) controls data movement through the 8-bit shift register on each rising edge, while STCP (storage clock) captures the current shift register contents and transfers them to the parallel output latches (Q0–Q7). This separation allows continuous serial loading without affecting stable output states - essential for flicker-free LED driving and deterministic I/O control.
Can the 74HC594BQX drive LEDs directly?
Yes - each Qn output delivers ±35 mA sink/source current at VCC = 6.0 V, sufficient to drive standard 20 mA LEDs with appropriate current-limiting resistors. The device's 100 MHz clock capability also supports high-refresh-rate multiplexed displays without visible flicker or ghosting.
Is the thermal pad on the DHVQFN16 package required to be soldered?
No - the exposed thermal pad (terminal 1 index area) has no electrical function and requires no solder connection. If soldered, it must remain floating or be tied to VCC; it is not a ground connection. Thermal performance is validated with the pad unsoldered per SOT763-1 specification.
How does the 74HC594BQX handle input voltages above VCC?
Input pins include integrated clamp diodes to VCC and GND. When interfacing with signals exceeding VCC (e.g., 5 V logic driving a 3.3 V system), a series current-limiting resistor must be used to restrict diode conduction current to ≤20 mA, preventing damage and ensuring reliable operation per Absolute Maximum Ratings.
74HC594BQX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HC
- Package/Case:
- 16-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- Shift Register
- Output Type:
- Push-Pull
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Function:
- Serial to Parallel, Serial
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-DHVQFN (2.5x3.5)
74HC594BQX FAQ
1.How can I place an order for 74HC594BQX through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HC594BQX 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 74HC594BQX reliable?
The price and inventory of 74HC594BQX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC594BQX is usually 5 days.
3.What payment methods are accepted for 74HC594BQX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC594BQX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HC594BQX?
74HC594BQX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HC594BQX 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 74HC594BQX?
For technical support, including 74HC594BQX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC594BQX requirements.
6.How does Aetrix verify that 74HC594BQX is sourced from the original manufacturer or authorized distributors?
All 74HC594BQX 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 74HC594BQX meets industry standards.
7.What is the process for return or replacement of 74HC594BQX?
All 74HC594BQX units undergo pre-shipment inspection (PSI). If there is an issue with 74HC594BQX, 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 74HC594BQX part is unused and in its original packaging.
Return procedure for 74HC594BQX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74HC594BQX Tags
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