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Nexperia USA Inc. 74AHC594DB,118
- Part No.:
- 74AHC594DB,118
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Shift Registers
- Package:
- 16-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74AHC594DB,118.pdf
- Description:
- IC SHIFT REGISTER 8BIT 16-SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,768
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Product details
Overview
74AHC594DB,118 from Nexperia is an 8-bit serial-in, parallel-out shift register with independent storage register, dual positive-edge-triggered clocks (SHCP and STCP), active-low asynchronous resets (SHR and STR), and cascading serial output Q7S. It operates from 2.0 V to 5.5 V, supports -40 °C to +125 °C, and delivers ≤7.8 ns propagation delay at 5 V with 50 pF load. It enables reliable serial-to-parallel data conversion in LED matrix drivers and microcontroller GPIO expanders.
For engineers reviewing the 74AHC594DB,118 datasheet, 74AHC594DB,118 pinout, 74AHC594DB,118 application, or 74AHC594DB,118 equivalent, this device is selected for deterministic timing control in synchronous digital systems requiring isolated shift and latch stages, Schmitt-trigger inputs for noise immunity, and overvoltage-tolerant I/O up to 5.5 V.
Technical Context
The 74AHC594DB,118 integrates two synchronized but independently clocked register stages: a 8-stage shift register accepting serial data on DS and shifting on SHCP, and an 8-bit D-type storage register capturing shifted data on STCP. Both SHR and STR provide dedicated asynchronous reset paths - SHR clears only the shift register, STR clears only the storage register - enabling precise stage-level initialization without cross-stage interference.
Its dual-clock architecture allows strict separation of data loading (SHCP) and output latching (STCP), preventing metastability during cascaded operation. With Schmitt-trigger inputs, it tolerates slow-rising signals and rejects high-frequency noise, while CMOS-level input thresholds (VIH ≥ 3.85 V at VCC = 5.5 V) ensure compatibility with 3.3 V and 5 V logic families.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | AHC - Advanced High-Speed CMOS, optimized for low power and high speed at 2.0–5.5 V supply |
| Function | 8-bit serial-in/parallel-out shift register with separate output storage register and Q7S cascade output |
| Propagation Delay | ≤7.8 ns (tPLH/tPHL, VCC = 4.5–5.5 V, CL = 50 pF) - enables >100 MHz clock operation in clean signal environments |
| Supply Voltage Range | 2.0 V to 5.5 V - supports mixed-voltage system interfacing and battery-powered 3.3 V designs |
| Input Thresholds | VIH = 3.85 V min, VIL = 1.65 V max at VCC = 5.5 V - ensures robust TTL/CMOS logic level compatibility |
| Operating Temperature | -40 °C to +125 °C - qualified for automotive under-hood and industrial control applications |
| ESD Protection | HBM >2000 V, CDM >1000 V - reduces handling sensitivity and improves board-level reliability |
Pinout & Package
74AHC594DB,118 uses the SOT338-1 (SSOP16) package: plastic shrink small outline package, 16 leads, body width 5.3 mm, pitch 0.65 mm. Pin 1 index located at top-left corner with beveled edge marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Q0 | Parallel output bit 0 - driven by storage register; stable until next STCP edge |
| 2 | Q1 | Parallel output bit 1 - matches Q0 timing and drive strength; used for 8-bit bus alignment |
| 3 | Q2 | Parallel output bit 2 - identical electrical characteristics to Q0–Q7; no internal buffering difference |
| 4 | Q3 | Parallel output bit 3 - provides deterministic setup/hold relative to STCP for synchronous capture |
| 5 | Q4 | Parallel output bit 4 - shares same output structure as Q0–Q7; supports 8 mA sink/source per pin |
| 6 | Q5 | Parallel output bit 5 - low-impedance CMOS output stage; VOL ≤ 0.55 V at 8 mA sink (VCC = 4.5 V) |
| 7 | Q6 | Parallel output bit 6 - directly connected to storage register Q6; no additional logic delay |
| 8 | GND | Ground reference - all internal logic and I/O referenced to this node; requires low-impedance PCB return path |
| 9 | Q7S | Serial output - reflects internal Q6S after SHCP edge; enables daisy-chaining multiple 74AHC594 devices |
| 10 | SHR | Shift register reset - active-low asynchronous clear of shift register only; does not affect storage register |
| 11 | SHCP | Shift clock - positive-edge-triggered; advances serial data through shift register stages |
| 12 | STCP | Storage clock - positive-edge-triggered; transfers current shift register contents to parallel outputs |
| 13 | STR | Storage register reset - active-low asynchronous clear of storage register only; leaves shift register unchanged |
| 14 | DS | Data serial input - sampled on rising SHCP edge; accepts standard CMOS-level signals |
| 15 | Q7 | Parallel output bit 7 - final bit of storage register; aligned with Q0–Q6 for byte-wide readout |
| 16 | VCC | Supply voltage - powers both shift and storage registers; decoupling capacitor required near pin |
Key Features
| Feature | Design Value |
|---|---|
| Independent shift and storage clocks | Enables pipelined operation: new data can be loaded into shift register while previous data remains latched on outputs |
| Dual asynchronous reset (SHR/STR) | Allows selective clearing of shift or storage stage without disturbing the other - critical for error recovery in real-time systems |
| Schmitt-trigger inputs | Provides hysteresis (≥0.5 V typical) on all control inputs (SHCP, STCP, SHR, STR, DS), rejecting noise on long traces or unfiltered switches |
| Overvoltage-tolerant inputs | Accepts VI up to 5.5 V regardless of VCC setting - simplifies level-shifting in mixed-supply systems |
| High noise immunity | CMOS input structure with >40 % VCC noise margin at VCC = 5 V - prevents false triggering in electrically noisy industrial environments |
Applications
| LED Matrix Driver | Microcontroller GPIO Expander |
|---|---|
Use Scenario: Driving 8×8 monochrome LED displays using SPI-controlled column scanning. IC Role / Device Role / Timing Role: Serial data from MCU is shifted in via DS/SHCP, then latched to outputs via STCP to drive LED columns simultaneously. Use Value: Eliminates need for 8-bit parallel MCU ports; enables compact PCB layout with single SPI line and two clock lines. |
Use Scenario: Extending limited GPIO count on ARM Cortex-M0+ microcontrollers for sensor interface and status indicators. IC Role / Device Role / Timing Role: Acts as synchronous output expander - MCU writes serial data, then asserts STCP to update all 8 outputs atomically. Use Value: Provides glitch-free output updates and eliminates software bit-banging delays; supports hot-plug detection via STR reset. |
| Cascaded Display Controller | Industrial PLC Output Module |
Use Scenario: Controlling 24-bit RGB LED strips using three daisy-chained 74AHC594s. IC Role / Device Role / Timing Role: First device's Q7S feeds DS of second, and so on; SHCP and STCP shared across chain for synchronized update. Use Value: Enables scalable output expansion with minimal MCU pin usage - only 3 pins (DS, SHCP, STCP) control N×8 outputs. |
Use Scenario: Isolating PLC CPU from 24 V DC output loads via optocoupler-driven relay banks. IC Role / Device Role / Timing Role: Shift register buffers digital command words from PLC backplane; STR allows emergency output shutdown independent of data stream. Use Value: Provides fail-safe output reset capability and EMI-resistant serial control in harsh factory environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit serial-in/parallel-out shift register with storage register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74AHCT594DB,118 | TTL-compatible input thresholds (VIH = 2.0 V min at VCC = 4.5 V); otherwise identical pinout, timing, and function | Better suited for legacy 5 V systems with LSTTL outputs; less suitable for 3.3 V-only designs due to reduced noise margin | Select when interfacing directly with 74LS/74ALS logic; verify VIH/VIL margins against driver specs |
| SN74HC595PWR | Single clock (SRCLK + RCLK), no independent SHR/STR; Q7S present but no dedicated storage reset; TI packaging (TSSOP) | Lacks independent storage reset - cannot clear outputs without shifting new data; lower max fmax (100 MHz vs 170 MHz) | Choose for cost-sensitive, non-safety-critical applications where atomic output reset is unnecessary |
Compared with 74AHCT594DB,118, the AHC version offers superior noise immunity and wider VCC range, while SN74HC595PWR trades functional safety (independent reset) and speed for broader vendor availability and lower unit cost in high-volume consumer designs.
Availability
74AHC594DB,118 is available at Aetrix Electronics and suitable for LED display drivers, microcontroller peripheral expansion, industrial PLC output modules, and cascaded lighting controllers requiring stable component supply across automotive and industrial temperature ranges.
Supply support for 74AHC594DB,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, discrete, and MOSFET technologies.
The 74AHC594DB,118 belongs to Nexperia's AHC logic family - engineered for high-speed, low-power operation across wide supply and temperature ranges, targeting noise-immune digital control and interface applications.
FAQ
What is the maximum clock frequency supported by the 74AHC594DB,118?
The 74AHC594DB,118 supports up to 170 MHz for SHCP and STCP at VCC = 4.5–5.5 V and 25 °C (typical). At full industrial temperature range (-40 °C to +125 °C), guaranteed minimum fmax is 70 MHz. This rating assumes proper PCB layout, 50 pF load, and clean power supply decoupling.
Can SHCP and STCP be tied together for simplified control?
Yes, SHCP and STCP may be connected, but doing so causes the shift register to advance one position ahead of the storage register on each clock edge. Outputs will reflect data shifted in two cycles earlier - e.g., data entered on cycle N appears on Q0–Q7 at cycle N+2. For predictable behavior, use separate clocks.
Does the 74AHC594DB,118 support hot insertion or live swapping?
No - the device lacks Ioff protection or power-off isolation. Applying signals to inputs while VCC = 0 V may cause latch-up or excessive current flow. Always power VCC before applying input signals, and sequence power-down with inputs inactive to avoid damage.
How does the Schmitt-trigger input improve system reliability?
Schmitt-trigger action on all control inputs (SHCP, STCP, SHR, STR, DS) introduces hysteresis (~0.5 V at VCC = 5 V), rejecting noise spikes and slow-rising edges that could cause double-clocking or metastability. This is especially valuable in long-trace industrial wiring or switch-debounced interfaces.
74AHC594DB,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74AHC
- Package/Case:
- 16-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 2V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
74AHC594DB,118 FAQ
1.How can I place an order for 74AHC594DB,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AHC594DB,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 74AHC594DB,118 reliable?
The price and inventory of 74AHC594DB,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AHC594DB,118 is usually 5 days.
3.What payment methods are accepted for 74AHC594DB,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AHC594DB,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AHC594DB,118?
74AHC594DB,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AHC594DB,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 74AHC594DB,118?
For technical support, including 74AHC594DB,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AHC594DB,118 requirements.
6.How does Aetrix verify that 74AHC594DB,118 is sourced from the original manufacturer or authorized distributors?
All 74AHC594DB,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 74AHC594DB,118 meets industry standards.
7.What is the process for return or replacement of 74AHC594DB,118?
All 74AHC594DB,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74AHC594DB,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 74AHC594DB,118 part is unused and in its original packaging.
Return procedure for 74AHC594DB,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74AHC594DB,118 Tags
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74HC165D,653
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SN74LV165APWR
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