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Nexperia USA Inc. 74HCT595BQ,115
- Part No.:
- 74HCT595BQ,115
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Shift Registers
- Package:
- 16-VFQFN Exposed Pad
- Datasheet:
-
74HCT595BQ,115.pdf
- Description:
- IC 8BIT SHIFT REGISTER 16-DHVQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,375
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Product details
Overview
74HCT595BQ,115 from Nexperia is an 8-bit serial-in/serial-or-parallel-out shift register with storage latch and 3-state outputs, designed for TTL-level input compatibility (VIL ≤ 0.8 V, VIH ≥ 2.0 V at VCC = 4.5–5.5 V), 100 MHz typical shift-out frequency, and operation across –40 °C to +125 °C. It enables cascaded LED driver interfaces and microcontroller GPIO expansion in industrial control panels.
For engineers reviewing the 74HCT595BQ,115 datasheet, 74HCT595BQ,115 pinout, 74HCT595BQ,115 application, or 74HCT595BQ,115 equivalent, key selection criteria include TTL-compatible input thresholds, DHVQFN16 thermal performance (11.2 mW/K derating above 106 °C), 3-state output enable timing (ten = 21–53 ns), and MR-driven asynchronous reset behavior.
Technical Context
The device implements two independent clock domains: SHCP controls 8-stage shift register progression (data enters via DS, exits via Q7S), while STCP latches shifted data into the 8-bit storage register. Outputs Q0–Q7 reflect storage register contents only when OE is LOW; a HIGH on OE forces all outputs into high-impedance state without affecting internal registers.
MR is an asynchronous active-LOW reset that clears only the shift register-not the storage register-allowing safe initialization without disrupting held output states. Input clamp diodes permit interfacing with 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 microcontrollers and FPGAs. |
| Supply Voltage Range | 4.5 V to 5.5 V - matches standard 5 V systems; supports stable operation under ±5 % rail tolerance. |
| Max Clock Frequency | 52 MHz (fmax, VCC = 5 V) - enables >10 Mbps serial data throughput for real-time display refresh or sensor data aggregation. |
| Propagation Delay | tpd(SHCP→Q7S) = 25–63 ns - defines minimum inter-bit timing for reliable daisy-chained shift register chains. |
| Output Drive Strength | ±6 mA (Qn), ±4 mA (Q7S) at VCC = 5 V - sufficient to directly drive LEDs or interface with 74-series logic inputs without external buffers. |
| Operating Temperature | –40 °C to +125 °C - qualified for under-hood automotive modules, motor drives, and industrial PLC I/O expansion. |
| ESD Rating | HBM > 2000 V, CDM > 1000 V - meets IEC 61000-4-2 Level 3 requirements for board-level ESD robustness. |
Pinout & Package
DHVQFN16 package (SOT763-1): 2.5 mm × 3.5 mm × 0.85 mm body, 16-terminal leadless construction with exposed thermal pad; optimized for high-density PCB layouts and improved thermal dissipation over SO16/TSSOP variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Q1) | Parallel output bit 1 | Drives external load (e.g., LED anode or logic input); enabled only when OE = LOW and STCP has latched valid data. |
| 2 (GND) | Ground reference | Primary return path for all internal logic and output currents; must be low-impedance connection to minimize ground bounce. |
| 3 (Q3) | Parallel output bit 3 | One of eight buffered parallel outputs; shares same 3-state control and timing as Q0–Q7. |
| 4 (Q4) | Parallel output bit 4 | Provides synchronized parallel data after STCP edge; critical for simultaneous update of multi-segment displays. |
| 5 (Q5) | Parallel output bit 5 | Used in cascaded configurations where multiple 74HCT595s feed a common bus; requires precise OE timing coordination. |
| 6 (Q6) | Parallel output bit 6 | Supports high-speed data routing in test equipment digital pattern generators with minimal skew vs. adjacent bits. |
| 7 (Q7) | Parallel output bit 7 / MSB | Final parallel output; also feeds internal Q7S for daisy-chaining - enables seamless expansion beyond 8 bits. |
| 8 (GND) | Second ground terminal | Reduces package inductance; improves noise immunity during simultaneous switching of all eight outputs. |
| 9 (Q7S) | Serial output | Shifted-out MSB from current device; connects to DS of next 74HCT595 in cascade chain for N×8-bit extension. |
| 10 (MR) | Master reset | Asynchronous active-LOW signal; clears shift register only - preserves stored output state until next STCP pulse. |
| 11 (SHCP) | Shift clock input | LOW-to-HIGH edge shifts DS bit into stage 0; all internal stages advance synchronously - defines serial bit rate. |
| 12 (STCP) | Storage clock input | LOW-to-HIGH edge transfers full 8-bit shift register content to storage register; enables glitch-free parallel output update. |
| 13 (OE) | Output enable | Active-LOW control: OE = LOW enables Q0–Q7; OE = HIGH places outputs in high-Z - essential for bus sharing. |
| 14 (DS) | Serial data input | Accepts new bit on each SHCP rising edge; compatible with MCU SPI MOSI or GPIO bit-banged streams. |
| 15 (Q0) | Parallel output bit 0 / LSB | First parallel output; often used for least-significant digit in numeric displays or status indicators. |
| 16 (VCC) | Supply voltage | 5 V nominal; powers all logic and output drivers; requires local 100 nF ceramic decoupling adjacent to pin 16. |
Key Features
| Feature | Design Value |
|---|---|
| Independent shift/storage clocks | Enables continuous serial loading while holding stable parallel outputs - eliminates visual flicker in LED matrix refresh. |
| TTL-compatible inputs | VIL ≤ 0.8 V and VIH ≥ 2.0 V at 5 V supply - ensures direct connection to 5 V microcontrollers without level-shifting. |
| 3-state parallel outputs | OE-controlled high-impedance mode allows multiple 74HCT595s to share a common data bus without contention. |
| Asynchronous master reset | MR clears shift register independently of clocks - simplifies power-on initialization and error recovery sequences. |
| Thermally enhanced DHVQFN16 | SOT763-1 package provides 11.2 mW/K thermal derating above 106 °C - supports sustained operation in enclosed industrial enclosures. |
Applications
| LED Display Driver | Microcontroller GPIO Expander |
|---|---|
|
Use Scenario: Driving 8-segment alphanumeric displays or 8×8 LED matrices in HVAC control panels. IC Role / Device Role / Timing Role: Serial-to-parallel converter that accepts SPI data from MCU and updates all segments simultaneously on STCP edge. Use Value: Reduces MCU pin count by 8 while enabling flicker-free multiplexed display updates via precise STCP timing control. |
Use Scenario: Adding 8 digital output lines to an STM32F4-based motor controller with limited GPIO availability. IC Role / Device Role / Timing Role: Output expander synchronized to MCU's hardware SPI peripheral; OE managed via separate GPIO for bus isolation. Use Value: Eliminates need for discrete transistors or additional MCUs; supports hot-plug detection via MR-initiated reset sequence. |
| Industrial I/O Module | Test Equipment Pattern Generator |
|
Use Scenario: Isolated digital output card in programmable logic controller (PLC) backplane with 125 °C ambient rating. IC Role / Device Role / Timing Role: Latched output stage buffering field-side relays; MR tied to system watchdog for fail-safe shutdown. Use Value: Guarantees known output state during power-up/failure; DHVQFN16 package withstands convection-cooled enclosure temperatures. |
Use Scenario: Generating synchronized 8-bit stimulus patterns for IC functional testing in automated test equipment (ATE). IC Role / Device Role / Timing Role: High-speed shift register clocked at 50 MHz to produce deterministic bit sequences on Q0–Q7. Use Value: Achieves <1 ns inter-output skew via matched internal routing; supports repeatable test vector execution without software overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit serial-to-parallel shift register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HC595BQ,115 | CMOS-input variant; VIL/VIH referenced to VCC; wider 2–6 V supply range. | Better suited for mixed-voltage systems (e.g., 3.3 V MCU driving 5 V peripherals) due to rail-relative thresholds. | Select when interfacing with 3.3 V logic or variable-supply designs; avoid in strict 5 V TTL environments due to higher VIL. |
| SN74HC595PWR | Texas Instruments TSSOP16 variant; identical logic function but different package (SOT403-1) and thermal profile. | Larger footprint and lower thermal efficiency than DHVQFN16; suitable for prototyping or low-volume manual assembly. | Choose for compatibility with existing TI-based BOMs or when DHVQFN reflow capability is unavailable. |
Compared with 74HC595BQ,115 and SN74HC595PWR, the 74HCT595BQ,115 offers guaranteed TTL input thresholds for robust 5 V system integration, superior thermal performance in space-constrained layouts, and tighter propagation delay consistency across temperature - making it optimal for high-reliability industrial timing-critical applications.
Availability
74HCT595BQ,115 is available at Aetrix Electronics and suitable for LED display drivers, microcontroller GPIO expanders, industrial I/O modules, and test equipment pattern generators requiring stable component supply across extended temperature ranges.
Supply support for 74HCT595BQ,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 focused on high-volume, high-reliability logic, analog, and MOSFET solutions for automotive, industrial, and consumer markets.
The 74HCT595 belongs to Nexperia's industry-standard logic portfolio, engineered specifically for robust serial-to-parallel data conversion in harsh environments where TTL compatibility, thermal resilience, and long-term supply stability are mandatory.
FAQ
Can 74HCT595BQ,115 operate at 3.3 V supply?
No - the 74HCT595 variant is specified only for 4.5 V to 5.5 V operation per its recommended conditions table. At 3.3 V, input thresholds fall outside TTL specification (VIH min = 2.0 V requires ≥60% VCC), risking unreliable logic recognition. Use 74HC595BQ,115 instead for true 3.3 V compatibility.
What is the purpose of the dual ground pins (pins 2 and 8)?
Pins 2 and 8 are separate GND terminals assigned to distinct internal power domains: pin 2 serves core logic and shift register, while pin 8 grounds the output driver stage. This separation minimizes ground bounce during simultaneous switching of all eight outputs, preserving signal integrity in noise-sensitive applications like precision test equipment.
How does MR interact with the storage register during reset?
MR resets only the 8-bit shift register to zero; it leaves the storage register and parallel outputs (Q0–Q7) unchanged. This allows safe initialization of incoming serial data flow without disturbing currently displayed or actuated outputs - critical for maintaining system state during fault recovery.
Is the DHVQFN16 package RoHS and REACH compliant?
Yes - the SOT763-1 package used for 74HCT595BQ,115 complies with EU RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006, including restrictions on lead, cadmium, mercury, hexavalent chromium, PBB, PBDE, and SVHC substances. Full compliance documentation is available from Nexperia upon request.
74HCT595BQ,115 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HCT
- Package/Case:
- 16-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- Shift Register
- Output Type:
- Tri-State
- 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)
74HCT595BQ,115 FAQ
1.How can I place an order for 74HCT595BQ,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT595BQ,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 74HCT595BQ,115 reliable?
The price and inventory of 74HCT595BQ,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT595BQ,115 is usually 5 days.
3.What payment methods are accepted for 74HCT595BQ,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT595BQ,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT595BQ,115?
74HCT595BQ,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT595BQ,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 74HCT595BQ,115?
For technical support, including 74HCT595BQ,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT595BQ,115 requirements.
6.How does Aetrix verify that 74HCT595BQ,115 is sourced from the original manufacturer or authorized distributors?
All 74HCT595BQ,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 74HCT595BQ,115 meets industry standards.
7.What is the process for return or replacement of 74HCT595BQ,115?
All 74HCT595BQ,115 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT595BQ,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 74HCT595BQ,115 part is unused and in its original packaging.
Return procedure for 74HCT595BQ,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74HCT595BQ,115 Tags
-
SN74HC164DR
Texas Instruments
-
SN74HC595DR
Texas Instruments
-
74HC595PW,118
Nexperia USA Inc.
-
SN74HC165PWR
Texas Instruments
-
HEF4094BT,653
Nexperia USA Inc.
-
74HC595D,118
Nexperia USA Inc.
-
SN74HC595PWR
Texas Instruments
-
74HC165D,653
Nexperia USA Inc.
-
SN74LV165APWR
Texas Instruments
-
74HC595BQ,115
Nexperia USA Inc.
-
74HC165BQ,115
Nexperia USA Inc.
-
CD4094BPWR
Texas Instruments
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