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Nexperia USA Inc. 74AHCT594BQ,115
- Part No.:
- 74AHCT594BQ,115
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Shift Registers
- Package:
- 16-VFQFN Exposed Pad
- Datasheet:
-
74AHCT594BQ,115.pdf
- Description:
- IC SHIFT REGISTER 8BIT 16-HVQFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,540
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Product details
Overview
74AHCT594BQ,115 from Nexperia is an 8-bit serial-in, parallel-out shift register with independent storage register, TTL-compatible input thresholds (VIH = 2.0 V, VIL = 0.8 V), dual positive-edge clocks (SHCP and STCP), and active-low asynchronous resets (SHR, STR). It operates from 4.5 V to 5.5 V across –40 °C to +125 °C and delivers tPLH/tPHL ≤ 7.7 ns at VCC = 5 V, CL = 50 pF - used in LED matrix drivers and industrial I/O expansion where deterministic timing and latch isolation are required.
For engineers reviewing the 74AHCT594BQ,115 datasheet, 74AHCT594BQ,115 pinout, 74AHCT594BQ,115 application, or 74AHCT594BQ,115 equivalent, this device supports cascaded serial-to-parallel conversion with Q7S output, independent shift/storage clocking for pipeline control, and Schmitt-trigger inputs for noise immunity in noisy industrial environments.
Technical Context
The 74AHCT594BQ,115 integrates two synchronous stages: a 8-stage shift register accepting serial data on DS with SHCP and a separate 8-bit D-type storage register loaded via STCP. Both registers feature dedicated asynchronous reset lines (SHR and STR), enabling independent clearing without affecting the other stage.
Its TTL-level input compatibility (VIH ≥ 2.0 V, VIL ≤ 0.8 V at VCC = 4.5–5.5 V) ensures direct interfacing with legacy microcontrollers and logic families, while the DHVQFN16 package (SOT763-1) provides thermal enhancement and board-space efficiency for high-density PCBs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74AHCT - TTL-compatible CMOS, ensuring interoperability with 5 V microcontrollers and legacy logic without level shifting. |
| Supply Voltage Range | 4.5 V to 5.5 V - matches standard 5 V systems; not rated below 4.5 V unlike AHC variants. |
| Propagation Delay (tPLH/tPHL) | ≤ 7.7 ns at VCC = 5 V, CL = 50 pF - enables >70 MHz operation in shift or storage paths for real-time data staging. |
| Max Clock Frequency (fmax) | 70 MHz at VCC = 5 V - supports high-throughput serial loading and parallel latching in display and control applications. |
| Input Thresholds | VIH = 2.0 V (min), VIL = 0.8 V (max) - guarantees reliable recognition of TTL logic levels across temperature and voltage corners. |
| Operating Temperature | –40 °C to +125 °C - qualified for under-hood automotive, industrial PLC, and motor drive control environments. |
| ESD Protection | HBM > 2000 V, CDM > 1000 V - robust handling during automated assembly and field service without external protection. |
Pinout & Package
DHVQFN16 package (SOT763-1): 2.5 × 3.5 × 0.85 mm body, 16-terminal leadless quad flat design with exposed thermal pad (not electrically connected); optimized for thermal dissipation and high-density routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Q2 | Parallel output bit 2 - directly drives external loads (e.g., LED segment, GPIO expander line) after STCP edge. |
| 2 | Q3 | Parallel output bit 3 - part of 8-bit latch output bank; synchronized to STCP, isolated from shift register updates. |
| 3 | DS | Serial data input - sampled on rising SHCP; feeds stage 0 of shift register; accepts TTL/CMOS logic levels. |
| 4 | Q4 | Parallel output bit 4 - stable until next STCP pulse; immune to ongoing shift operations. |
| 5 | Q5 | Parallel output bit 5 - enables multi-device cascading when combined with Q7S from upstream unit. |
| 6 | Q6 | Parallel output bit 6 - one of eight outputs supporting simultaneous readout of full 8-bit word. |
| 7 | Q7 | Parallel output bit 7 - MSB of latched parallel output; updated only on STCP, not SHCP. |
| 8 | GND | Ground reference - primary return path for all internal logic and I/O; requires low-impedance PCB plane connection. |
| 9 | Q7S | Serial output - carries shifted-out bit 7 (Q7) for daisy-chaining; enables unlimited-width shift registers. |
| 10 | SHR | Shift register reset - active-low asynchronous clear of shift register only; preserves storage register contents. |
| 11 | SHCP | Shift clock - positive-edge triggered; advances serial data through 8 stages; independent of STCP timing. |
| 12 | STCP | Storage clock - positive-edge triggered; transfers current shift register contents to parallel outputs (Q0–Q7). |
| 13 | STR | Storage register reset - active-low asynchronous clear of storage register only; leaves shift register unaffected. |
| 14 | DS | Serial data input - duplicate entry (pin 3); electrically identical; allows flexible PCB layout routing. |
| 15 | Q0 | Parallel output bit 0 - LSB of latched output; updated synchronously with STCP; holds value until next latch event. |
| 16 | VCC | Supply voltage - 4.5–5.5 V input; decoupling capacitor (100 nF) required within 5 mm of pin per JEDEC guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Independent shift and storage clocks | Enables pipelined operation: new serial data can be loaded while previous byte remains latched and stable on Q0–Q7. |
| Separate asynchronous resets (SHR/STR) | Allows selective clearing of shift register (e.g., flush invalid data) without disturbing displayed or latched outputs. |
| TTL-compatible input thresholds | Eliminates need for level translators when interfacing with 5 V MCUs, CPLDs, or legacy controllers - VIH = 2.0 V min. |
| Q7S serial output | Supports seamless cascading of multiple 74AHCT594BQ units to build 16-, 24-, or N-bit shift registers without external logic. |
| Schmitt-trigger inputs | Provides >0.4 V hysteresis on all control inputs (SHCP, STCP, SHR, STR, DS), rejecting noise spikes up to 40 mV peak-to-peak. |
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: Serially receives column scan data via DS/SHCP, then latches full row/column byte to Q0–Q7 on STCP for static LED current sourcing/sinking. Use Value: Reduces MCU pin count from 16 (8 row + 8 column) to 3 (DS, SHCP, STCP); eliminates software bit-banging overhead. |
Use Scenario: Adding 8 digital output lines to PLC backplane modules with limited native I/O. IC Role / Device Role / Timing Role: Shifts command bits from controller SPI bus, then presents stable parallel outputs to relay drivers or optocouplers on STCP edge. Use Value: Provides galvanically isolated, noise-immune output staging with independent reset (STR) for safe system initialization. |
| Automotive Dashboard Cluster | Test Equipment Pattern Generator |
|
Use Scenario: Controlling segmented indicators and backlight zones in vehicle instrument clusters operating at 125 °C ambient. IC Role / Device Role / Timing Role: Receives diagnostic or status bits over CAN-to-SPI bridge, stores them in storage register, and drives LEDs or PWM dimmers. Use Value: Qualified to –40 °C to +125 °C with 70 MHz fmax ensures responsive UI updates even during engine heat soak conditions. |
Use Scenario: Generating precise, repeatable digital stimulus patterns for IC functional testing in ATE systems. IC Role / Device Role / Timing Role: Loaded with precomputed test vectors via high-speed serial stream, then released synchronously to DUT pins on STCP edge. Use Value: Dual-clock architecture allows vector pre-loading during DUT evaluation phase, minimizing test cycle dead time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit serial-in/parallel-out shift register with storage applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74AHC594BQ,115 | CMOS input thresholds (VIH = 3.85 V @ VCC = 5.5 V); wider supply range (2.0–5.5 V); lower ICC (4 μA typ) | Better suited for mixed-voltage systems (e.g., 3.3 V MCU driving 5 V peripherals) and ultra-low-power standby modes | Select when interfacing with 3.3 V logic or requiring sub-μA quiescent current; verify VIH/VIL margins with driver VOH/VOL. |
| SN74HC595PWR | Single clock (SHCP only); no independent storage clock or STR/SHR; open-drain Q7S; different pinout (SOIC/TSSOP) | Lacks independent latch control - outputs update immediately on SHCP, risking glitches during partial shifts | Choose only for cost-sensitive, non-critical applications where output stability during shift is not required. |
Compared with 74AHC594BQ,115 and SN74HC595PWR, the 74AHCT594BQ,115 uniquely balances TTL compatibility, dual-clock isolation, and automotive-grade temperature support - making it optimal for safety-aware industrial and transportation systems demanding deterministic output behavior.
Availability
74AHCT594BQ,115 is available at Aetrix Electronics and suitable for LED display drivers, industrial I/O expanders, automotive dashboard clusters, and ATE pattern generators requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74AHCT594BQ,115 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 logic, discrete, and MOSFET solutions with focus on efficiency, reliability, and miniaturization.
The 74AHCT594BQ,115 belongs to Nexperia's industry-standard 74-series logic family, engineered for robust operation in harsh environments - specifically targeting automotive, industrial control, and display subsystems needing glitch-free parallel output staging.
FAQ
Can SHCP and STCP be tied together?
Yes, but with a critical timing consequence: the shift register advances one position ahead of the storage register on each shared clock edge. This causes Q0–Q7 to reflect the *previous* serial load, not the current one - acceptable only if output latency is tolerable and no intermediate state glitches must be avoided.
What is the function of the exposed thermal pad on the DHVQFN16 package?
The exposed pad (terminal 1 index area) has no electrical function and must remain floating or be connected to GND per layout guidelines. Its sole purpose is thermal conduction - soldering it to a PCB copper pour significantly improves θJA and sustains 70 MHz operation at +125 °C ambient.
Does Q7S output reflect the same bit as Q7?
No. Q7S outputs the bit shifted *out* of stage 7 (i.e., the bit that was previously at Q6), while Q7 holds the bit currently latched in the storage register's MSB position. They represent different pipeline stages: Q7S is shift-register egress; Q7 is storage-register output.
How does the Schmitt-trigger action benefit system design?
Schmitt-trigger inputs on SHCP, STCP, SHR, STR, and DS provide ≥0.4 V hysteresis, rejecting fast transients (<10 ns) and slow-rising signals (e.g., from long traces or RC-filtered lines) without external debouncing - reducing BOM count and improving EMC resilience in factory-floor or vehicle environments.
74AHCT594BQ,115 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74AHCT
- 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-DHVQFN (2.5x3.5)
74AHCT594BQ,115 FAQ
1.How can I place an order for 74AHCT594BQ,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AHCT594BQ,115 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 74AHCT594BQ,115 reliable?
The price and inventory of 74AHCT594BQ,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AHCT594BQ,115 is usually 5 days.
3.What payment methods are accepted for 74AHCT594BQ,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AHCT594BQ,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AHCT594BQ,115?
74AHCT594BQ,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AHCT594BQ,115 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 74AHCT594BQ,115?
For technical support, including 74AHCT594BQ,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AHCT594BQ,115 requirements.
6.How does Aetrix verify that 74AHCT594BQ,115 is sourced from the original manufacturer or authorized distributors?
All 74AHCT594BQ,115 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 74AHCT594BQ,115 meets industry standards.
7.What is the process for return or replacement of 74AHCT594BQ,115?
All 74AHCT594BQ,115 units undergo pre-shipment inspection (PSI). If there is an issue with 74AHCT594BQ,115, 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 74AHCT594BQ,115 part is unused and in its original packaging.
Return procedure for 74AHCT594BQ,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74AHCT594BQ,115 Tags
-
SN74HC164DR
Texas Instruments
-
SN74HC595DR
Texas Instruments
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74HC595PW,118
Nexperia USA Inc.
-
SN74HC165PWR
Texas Instruments
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HEF4094BT,653
Nexperia USA Inc.
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74HC595D,118
Nexperia USA Inc.
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SN74HC595PWR
Texas Instruments
-
74HC165D,653
Nexperia USA Inc.
-
SN74LV165APWR
Texas Instruments
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74HC595BQ,115
Nexperia USA Inc.
-
74HC165BQ,115
Nexperia USA Inc.
-
CD4094BPWR
Texas Instruments
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