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Nexperia USA Inc. 74HCT594DB,112
- Part No.:
- 74HCT594DB,112
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Shift Registers
- Package:
- 16-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74HCT594DB,112.pdf
- Description:
- IC 8BIT SHIFT REGISTER 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,037
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Product details
Overview
74HCT594DB,112 from Nexperia is an 8-bit serial-in/parallel-out shift register with independent shift and storage registers, TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V), 100 MHz typical maximum clock frequency, and operation across -40 °C to +125 °C. It enables serial-to-parallel data conversion in LED matrix drivers and industrial I/O expanders where cascaded output staging and synchronous latch control are required.
For engineers reviewing the 74HCT594DB,112 datasheet, 74HCT594DB,112 pinout, 74HCT594DB,112 application, or 74HCT594DB,112 equivalent, key selection criteria include independent SHCP/STCP timing control, active-low SHR/STR reset independence, Q7S serial cascade capability, and SSOP16 package thermal performance under sustained 5 V operation.
Technical Context
The device implements two synchronized but electrically isolated 8-bit registers: a shift register accepting serial data on DS at SHCP rising edges, and a storage register transferring latched data to Q0–Q7 outputs on STCP rising edges. This dual-clock architecture prevents output glitches during ongoing serial loading.
Each register has dedicated asynchronous active-low reset (SHR for shift register, STR for storage register), enabling selective clearing without disrupting the other stage. Input clamp diodes allow safe interfacing to voltages exceeding VCC when used with current-limiting resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74HCT - TTL-compatible inputs, CMOS outputs; ensures robust interfacing with legacy 5 V microcontrollers and FPGAs. |
| Supply Voltage Range | 4.5 V to 5.5 V - specified for stable operation in standard 5 V systems; not rated for 3.3 V logic domains. |
| Max Clock Frequency | 92 MHz (typ) at VCC = 4.5 V - supports high-speed serial data ingestion up to ~11.5 MB/s in cascaded configurations. |
| Propagation Delay | 18 ns (SHCP→Q7S), 18 ns (STCP→Qn) - enables sub-55 ns total latency from serial input to stable parallel output. |
| Output Drive | ±6 mA (Qn), ±4 mA (Q7S) at VCC = 4.5 V - sufficient to directly drive LEDs or standard CMOS/TTL inputs without external buffers. |
| Operating Temperature | -40 °C to +125 °C - qualified for under-hood automotive, industrial motor control, and outdoor embedded applications. |
| ESD Rating | HBM > 2000 V, CDM > 1000 V - meets IEC 61000-4-2 Level 2 requirements for board-level ESD robustness. |
Pinout & Package
74HCT594DB,112 is housed in a 16-lead SSOP package (SOT338-1), 5.3 mm body width, 0.65 mm pitch, with exposed pad not electrically connected. Thermal resistance θJA derates linearly at 8.5 mW/K above 91 °C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–7, 15 | Q0–Q7 parallel outputs | CMOS buffered latched outputs; Q0 (pin 15) is MSB, Q7 (pin 7) is LSB of storage register. |
| 8 | GND | Ground reference for all internal logic and output stages; must be low-impedance connection. |
| 9 | Q7S serial output | Shift register MSB output; enables daisy-chaining multiple 74HCT594 devices without external wiring. |
| 10 | SHR | Active-low asynchronous reset for shift register only; clears shift stage independently of storage register. |
| 11 | SHCP | Rising-edge-triggered clock for shift register; data advances on LOW→HIGH transition. |
| 12 | STCP | Rising-edge-triggered clock for storage register; transfers shift register contents to Q0–Q7 outputs. |
| 13 | STR | Active-low asynchronous reset for storage register only; clears Q0–Q7 outputs without affecting shift register. |
| 14 | DS | Serial data input; sampled on each SHCP rising edge; synchronous with shift clock domain. |
| 16 | VCC | Positive supply; must be decoupled locally with 100 nF ceramic capacitor near pin 16. |
Key Features
| Feature | Design Value |
|---|---|
| Independent shift/storage clocks | Enables continuous serial loading while holding stable parallel outputs - critical for glitch-free display refresh. |
| Dual asynchronous resets | SHR and STR allow selective clearing of shift or output stage without disturbing the other, simplifying state recovery. |
| TTL-compatible inputs | VIH ≥ 2.0 V, VIL ≤ 0.8 V at 5 V supply - ensures reliable interface with legacy 5 V MCUs, CPLDs, and discrete logic families. |
| Clamp diode protection | Permits safe use of series current-limiting resistors when interfacing to signals > VCC (e.g., 12 V sensor lines). |
| SSOP16 thermal profile | Lower θJA than SO16; supports higher sustained clock rates in compact PCB layouts with limited airflow. |
Applications
| LED Matrix Driver | Industrial I/O Expander |
|---|---|
|
Use Scenario: Driving 8×8 monochrome LED displays using microcontroller GPIO-constrained designs. IC Role / Device Role / Timing Role: Serial-to-parallel converter with output latching; accepts SPI-like bitstream via DS/SHCP, then presents stable column/row data on Q0–Q7 at STCP edge. Use Value: Eliminates need for 8-bit parallel bus; reduces MCU pin count by 7 vs. direct GPIO control; Q7S enables vertical expansion to 16×8 or larger arrays. |
Use Scenario: Adding isolated digital outputs to PLC modules or programmable logic controllers. IC Role / Device Role / Timing Role: Output staging buffer; receives configuration bits over RS-485 UART, shifts into register, then atomically updates all 8 outputs on STCP. Use Value: Prevents partial-output transitions during update; SHR/STR allows safe reinitialization after communication error without disturbing field actuators. |
| Remote Control Decoder | Test Fixture Sequencer |
|
Use Scenario: Latching IR remote command codes in consumer electronics receiver boards. IC Role / Device Role / Timing Role: Holding register for decoded 8-bit opcodes; stores incoming pulse-width-modulated data until validated, then releases to system logic on STCP. Use Value: Decouples timing-sensitive IR demodulation from main processor interrupt latency; STR enables immediate command abort on invalid checksum. |
Use Scenario: Controlling stimulus sequence in automated PCB functional test rigs. IC Role / Device Role / Timing Role: Programmable pattern generator; preloaded via JTAG or UART, then stepped through using SHCP, with final output frozen on STCP for DUT interaction. Use Value: Enables deterministic, repeatable signal timing; Q7S cascade supports multi-board synchronization across fixture zones. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit serial-in/parallel-out shift register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HCT595DB,112 | Lacks independent storage register reset (STR); shares single SRCLR pin for both shift and storage stages. | Cannot clear outputs without also clearing shift register - unsuitable for applications requiring output hold during reload. | Select when cost sensitivity outweighs need for independent output reset; verify system-level reset sequencing. |
| SN74HC595PWR | CMOS-input variant (VIH = 3.15 V min at 4.5 V); higher propagation delay (30 ns typ STCP→Qn); TSSOP package. | Requires stronger drive from controller; less suitable for marginal 3.3 V → 5 V level translation without buffer. | Prefer when interfacing exclusively with 3.3 V logic families with adequate drive strength; avoid in mixed-voltage noise environments. |
Compared with 74HCT594DB,112, the 74HCT595DB,112 sacrifices output-stage isolation for lower gate count, while SN74HC595PWR trades input compatibility and speed for broader voltage flexibility - making the 74HCT594DB,112 optimal for deterministic, fault-tolerant 5 V I/O expansion.
Availability
74HCT594DB,112 is available at Aetrix Electronics and suitable for LED display drivers, industrial PLC I/O modules, and remote control receiver circuits requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74HCT594DB,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 global semiconductor expert delivering high-performance logic, analog, and MOSFET solutions with focus on reliability, efficiency, and miniaturization for automotive, industrial, and consumer markets.
The 74HCT594 belongs to Nexperia's industry-standard 74HCT logic family, engineered for robust 5 V system interfacing with guaranteed TTL-compatible inputs, rail-to-rail CMOS outputs, and extended temperature qualification.
FAQ
Can 74HCT594DB,112 operate at 3.3 V supply?
No. The 74HCT594DB,112 is specified only for 4.5 V to 5.5 V operation per its recommended conditions table. At 3.3 V, input thresholds (VIH ≥ 2.0 V) become marginal, and output drive (VOH/VOL) falls outside guaranteed limits. Use 74HC594 variants for true 2.0–6.0 V operation.
What is the minimum pulse width for SHCP and STCP?
At VCC = 4.5 V, the minimum HIGH or LOW pulse width for both SHCP and STCP is 4 ns (typical) and 20 ns (maximum) across -40 °C to +125 °C. Designers must ensure clock sources meet the 20 ns minimum to guarantee reliable register advancement and output latching.
How does Q7S differ from Q7 in cascade operation?
Q7S is the serial output of the *shift register* (MSB of shifted data), while Q7 is the parallel output of the *storage register*. In cascade mode, Q7S feeds DS of the next device, allowing continuous 16-/24-bit shift chains; Q7 remains latched and stable until STCP asserts, preventing output corruption during shifting.
Is the exposed pad on SSOP16 (SOT338-1) electrically connected?
No. The exposed thermal pad on the 74HCT594DB,112 SSOP16 package (SOT338-1) has no electrical function. Per Nexperia's package drawing, it may remain floating or be connected to VCC for thermal enhancement - but must never be tied to GND or left unconnected in high-reliability thermal designs.
74HCT594DB,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HCT
- Package/Case:
- 16-SSOP (0.209", 5.30mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
74HCT594DB,112 FAQ
1.How can I place an order for 74HCT594DB,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT594DB,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 74HCT594DB,112 reliable?
The price and inventory of 74HCT594DB,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT594DB,112 is usually 5 days.
3.What payment methods are accepted for 74HCT594DB,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT594DB,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT594DB,112?
74HCT594DB,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT594DB,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 74HCT594DB,112?
For technical support, including 74HCT594DB,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT594DB,112 requirements.
6.How does Aetrix verify that 74HCT594DB,112 is sourced from the original manufacturer or authorized distributors?
All 74HCT594DB,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 74HCT594DB,112 meets industry standards.
7.What is the process for return or replacement of 74HCT594DB,112?
All 74HCT594DB,112 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT594DB,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 74HCT594DB,112 part is unused and in its original packaging.
Return procedure for 74HCT594DB,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74HCT594DB,112 Tags
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