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Nexperia USA Inc. 74HCT166DB,118
- Part No.:
- 74HCT166DB,118
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Shift Registers
- Package:
- 16-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74HCT166DB,118.pdf
- Description:
- IC SHIFT REG 8BIT PI-SO 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,740
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Product details
Overview
74HCT166DB,118 from Nexperia is an 8-bit parallel-in/serial-out shift register with TTL-compatible inputs, asynchronous master reset (MR), clock enable (CE), and serial output Q7. It operates from 4.5 V to 5.5 V, supports -40 °C to +125 °C ambient range, and delivers 23 ns typical propagation delay (CP to Q7) at 4.5 V - used in microcontroller GPIO expansion and LED matrix controllers.
For engineers reviewing the 74HCT166DB,118 datasheet, 74HCT166DB,118 pinout, 74HCT166DB,118 application, or 74HCT166DB,118 equivalent, this device serves as a synchronous serial interface bridge for legacy parallel data sources, requiring precise setup/hold timing, low-power CMOS logic compatibility, and robust noise immunity in industrial control panels.
Technical Context
The 74HCT166DB,118 implements an 8-stage D-type flip-flop shift register with parallel load capability. Its dual-mode operation-parallel load when PE is LOW and serial shift when PE is HIGH-is synchronized to the rising edge of CP, while CE gates clock acceptance. MR forces all outputs LOW asynchronously, independent of clock state.
Input levels conform to TTL thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V at VCC = 4.5–5.5 V), ensuring direct interfacing with 5 V microcontrollers. Internal clamp diodes allow safe interfacing to voltages exceeding VCC when current-limiting resistors are used, supporting mixed-voltage system integration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74HCT - TTL-input compatible CMOS, enabling direct connection to 5 V MCU I/O without level shifters |
| Supply Voltage Range | 4.5 V to 5.5 V - matches standard 5 V rail; not operable below 4.5 V (unlike 74HC variant) |
| Propagation Delay (CP → Q7) | 23 ns typ. at 4.5 V - enables reliable 25 MHz operation in synchronous serial chains |
| Operating Temperature | -40 °C to +125 °C - qualified for under-hood automotive modules and industrial PLC backplanes |
| Input Clamp Diodes | Integrated - permits safe interface to signals up to VCC + 0.5 V using external current-limiting resistors |
| ESD Protection | HBM > 2000 V, CDM > 1000 V - reduces board-level ESD hardening requirements in assembly environments |
| Power Dissipation | 8 μA ICC typ. at 4.5 V - supports always-on status monitoring in low-power remote sensors |
Pinout & Package
74HCT166DB,118 is housed in a 16-lead SSOP package (SOT338-1), 5.3 mm × 6.2 mm body, 0.65 mm pitch - optimized for high-density PCB layouts with improved thermal dissipation over SO16.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DS) | Serial Data Input | Accepts bitstream during serial-shift mode; sampled on CP rising edge when PE = HIGH |
| 2–5, 10–14 (D0–D7) | Parallel Data Inputs | 8-bit parallel word loaded synchronously on CP rising edge when PE = LOW |
| 6 (CE) | Clock Enable | Active-LOW gate: disables CP input when HIGH, freezing register state without resetting |
| 7 (CP) | Clock Input | Rising-edge triggered; controls both parallel load and serial shift timing |
| 8 (GND) | Ground Reference | 0 V return path for all logic and power currents; must be low-impedance for noise immunity |
| 9 (MR) | Master Reset | Asynchronous active-LOW: forces Q7 and internal stages LOW regardless of CP or PE state |
| 13 (Q7) | Serial Output | MSB output of shift register; cascades to DS of next stage for multi-byte chaining |
| 15 (PE) | Parallel Enable | Active-LOW control: selects parallel-load mode (PE = LOW) vs. serial-shift mode (PE = HIGH) |
| 16 (VCC) | Positive Supply | 4.5–5.5 V power rail; decoupling capacitor required within 10 mm of pin for stable switching |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | VIH ≥ 2.0 V, VIL ≤ 0.8 V at 5 V - eliminates need for external level translators when driving from 5 V MCUs |
| Asynchronous master reset | MR asserts within 22 ns (typ.) at 4.5 V - enables deterministic fault recovery in safety-critical sequencers |
| Synchronous parallel load | 8-bit data captured on single CP edge with PE = LOW - reduces firmware overhead vs. bit-banged serial loading |
| Serial cascade capability | Q7 directly drives DS of identical device - supports N×8-bit shift chains without glue logic |
| Wide temperature operation | Specified from -40 °C to +125 °C - validated for use in motor drive control boards and outdoor metering enclosures |
Applications
| Industrial PLC I/O Expansion | LED Matrix Row Drivers |
|---|---|
Use Scenario: Adding 8 digital output lines to a compact PLC controller with limited GPIO. IC Role / Device Role / Timing Role: Parallel-loaded with scan pattern via MCU bus, then shifted out at 1 kHz to drive row transistors. Use Value: Reduces MCU pin count by 8 while maintaining deterministic 23 ns timing margin between rows. |
Use Scenario: Driving 64-row LED display using 8 cascaded 74HCT166DB,118 devices. IC Role / Device Role / Timing Role: Serial-shift register accepting SPI data at 2 MHz; Q7 feeds DS of next stage for daisy-chained refresh. Use Value: Enables full 64-bit update in <10 μs with no software overhead beyond SPI frame generation. |
| Legacy Parallel-to-Serial Bridge | Microcontroller Peripheral Interface |
Use Scenario: Converting parallel data from an older sensor ASIC (8-bit parallel bus) into UART-compatible serial stream. IC Role / Device Role / Timing Role: Loaded once per measurement cycle via PE pulse; shifted out LSB-first at fixed baud rate clock derived from CP. Use Value: Eliminates FPGA or dedicated protocol converter; leverages existing 5 V logic rails and timing budgets. |
Use Scenario: Offloading GPIO toggling tasks from an ARM Cortex-M0+ running real-time control firmware. IC Role / Device Role / Timing Role: Acts as peripheral shift buffer: CPU writes byte to parallel bus, triggers PE/CP, then proceeds to next task. Use Value: Frees ≥12 μs of CPU time per I/O update - measurable improvement in control loop jitter. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit parallel-in/serial-out shift register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HCT165DB,118 | Parallel-in/serial-out but with complementary (inverted) Q7 output; lacks MR pin | Requires external inverter for non-inverted serial output; unsuitable where hardware reset is mandatory | Select only if inverted output aligns with downstream receiver polarity and MR is managed elsewhere |
| SN74LV165APWR | 3.3 V–5.5 V supply; LV logic family; 16 ns tpd at 3.3 V; no MR pin | Lower voltage operation enables direct interface with 3.3 V FPGAs; incompatible with 5 V-only systems without translation | Prefer for mixed-voltage designs where 3.3 V logic dominates and MR is implemented in firmware |
Compared with 74HCT166DB,118, the 74HCT165DB,118 trades master reset for output inversion, while SN74LV165APWR sacrifices reset and 5 V noise margin for speed and dual-voltage flexibility - making the 74HCT166DB,118 optimal for deterministic reset-driven 5 V industrial interfaces.
Availability
74HCT166DB,118 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, LED matrix row drivers, legacy parallel-to-serial bridges, and microcontroller peripheral interfaces requiring stable component supply across extended temperature ranges.
Supply support for 74HCT166DB,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 logic, analog, and MOSFET solutions with focus on efficiency, reliability, and sustainability.
The 74HCT166DB,118 belongs to Nexperia's 74HCT logic family - engineered for robust 5 V TTL-compatible interfacing in industrial automation, building control, and instrumentation where noise immunity and wide temperature operation are critical.
FAQ
What is the minimum VCC required for guaranteed 74HCT166DB,118 operation?
The 74HCT166DB,118 is specified only for 4.5 V to 5.5 V operation. Below 4.5 V, input thresholds (VIH ≥ 2.0 V) and output drive strength (VOH ≥ 3.98 V at 4 mA) are not guaranteed. Operation at 4.0 V may result in metastability or increased propagation delay, and is outside JEDEC JESD7A compliance.
Can 74HCT166DB,118 be used with a 3.3 V microcontroller?
No - its TTL input thresholds require VIH ≥ 2.0 V, but more critically, its VCC must be 4.5–5.5 V to meet output VOH specifications. Driving it from a 3.3 V MCU violates absolute maximum ratings if VCC = 5 V and inputs exceed VCC + 0.5 V. A level-shifting buffer or 74LVC166 is required for 3.3 V systems.
How does the master reset (MR) interact with clock enable (CE)?
MR is fully asynchronous and overrides all other controls: when MR = LOW, Q7 and all internal flip-flops force LOW immediately, regardless of CE, PE, or CP state. CE only gates CP when MR = HIGH; it has no effect during MR assertion. This allows fail-safe reset independent of clock domain timing.
Is the 74HCT166DB,118 pin-compatible with 74HC166 variants?
Yes - all 74HC/HCT166 variants (including DB, D, PW packages) share identical pinouts per SOT338-1, SO16, and TSSOP16 footprints. However, electrical behavior differs: 74HC166 uses CMOS input thresholds (VIH = 0.7×VCC), while 74HCT166DB,118 requires TTL thresholds and operates only at 4.5–5.5 V, making direct substitution electrically invalid without verifying input drive strength.
74HCT166DB,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HCT
- 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:
- Parallel or Serial to Serial
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
74HCT166DB,118 FAQ
1.How can I place an order for 74HCT166DB,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT166DB,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 74HCT166DB,118 reliable?
The price and inventory of 74HCT166DB,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT166DB,118 is usually 5 days.
3.What payment methods are accepted for 74HCT166DB,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT166DB,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT166DB,118?
74HCT166DB,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT166DB,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 74HCT166DB,118?
For technical support, including 74HCT166DB,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT166DB,118 requirements.
6.How does Aetrix verify that 74HCT166DB,118 is sourced from the original manufacturer or authorized distributors?
All 74HCT166DB,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 74HCT166DB,118 meets industry standards.
7.What is the process for return or replacement of 74HCT166DB,118?
All 74HCT166DB,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT166DB,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 74HCT166DB,118 part is unused and in its original packaging.
Return procedure for 74HCT166DB,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74HCT166DB,118 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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