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Nexperia USA Inc. 74HCT166D-Q100J
- Part No.:
- 74HCT166D-Q100J
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Shift Registers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
74HCT166D-Q100J.pdf
- Description:
- IC SHIFT REGISTER 8BIT 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,003
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Product details
Overview
74HCT166D-Q100 from Nexperia is an automotive-grade 8-bit parallel-in/serial-out shift register with TTL-compatible inputs, asynchronous master reset (MR), clock enable (CE), and parallel load capability via active-low PE. It operates from 4.5 V to 5.5 V, supports -40 °C to +125 °C ambient range, and delivers 25 MHz max clock frequency at VCC = 4.5 V. Used in automotive body control modules for LED driver expansion and sensor data serialization.
For engineers reviewing the 74HCT166D-Q100 datasheet, 74HCT166D-Q100 pinout, 74HCT166D-Q100 application, or 74HCT166D-Q100 equivalent, this page provides verified functional behavior, AEC-Q100 Grade 1 qualification status, SO16 package mechanical data, timing parameters under automotive temperature extremes, and validated drop-in alternatives for serial data path design.
Technical Context
This device implements synchronous 8-stage shift register logic with dual input modes: parallel load (when PE = LOW) on CP rising edge, or serial shift (when PE = HIGH) with DS as serial input. MR asynchronously clears all stages to LOW, independent of CP or CE state.
CE enables or disables clock propagation - when CE = LOW, CP transitions shift data; when CE = HIGH, CP is blocked regardless of other inputs. Input clamp diodes allow safe interfacing to voltages exceeding VCC, supporting robust signal conditioning in noisy automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | 8-bit parallel-in/serial-out shift register with asynchronous reset and clock enable |
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with 5 V automotive microcontroller I/O domains |
| Operating Temperature | -40 °C to +125 °C - qualified per AEC-Q100 Grade 1 for under-hood and powertrain applications |
| Max Clock Frequency | 25 MHz at VCC = 4.5 V - supports high-speed serial data chaining in lighting or actuator control |
| Propagation Delay (CP to Q7) | 23 ns (typ) to 60 ns (max) at VCC = 4.5 V - defines worst-case latency for time-critical feedback loops |
| Input Compatibility | TTL-level inputs - interfaces directly with legacy 5 V MCU GPIO without level translation |
| Output Drive | ±4.0 mA VOH/VOL at VCC = 4.5 V - sufficient to drive multiple CMOS inputs or small LED segments |
Pinout & Package
Package: SO16 plastic small outline package (SOT109-1), 16-pin, 3.9 mm body width, gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DS) | Serial data input | Accepts serial bit stream during shift mode; sampled on CP rising edge when PE = HIGH |
| 2–5, 10–12, 14 (D0–D7) | Parallel data inputs | Load 8-bit word into register on next CP rising edge when PE = LOW |
| 6 (CE) | Clock enable (active LOW) | Blocks CP propagation when HIGH - enables precise gating of shift operations |
| 7 (CP) | Clock input (rising-edge triggered) | Drives all internal flip-flops synchronously; edge-sensitive, not level-sensitive |
| 8 (GND) | Ground reference | 0 V return path for all internal logic and I/O; must be low-impedance in automotive PCB layout |
| 9 (MR) | Master reset (active LOW) | Asynchronously clears all 8 stages to logic LOW - no clock required, critical for fail-safe initialization |
| 13 (Q7) | Serial output | LSB-serial output of final stage; used for daisy-chaining or microcontroller input capture |
| 15 (PE) | Parallel enable (active LOW) | Selects parallel load mode (PE = LOW) vs. serial shift mode (PE = HIGH) |
| 16 (VCC) | Positive supply | Primary power rail; decoupling capacitor required within 10 mm per AEC-Q100 layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for automotive use from -40 °C to +125 °C ambient, including thermal cycling and HTOL stress |
| Asynchronous master reset (MR) | Guarantees known initial state at power-up or fault recovery without waiting for clock edges |
| Clamp diode protected inputs | Enables direct connection to 12 V signals using current-limiting resistors - eliminates external protection components |
| Synchronous parallel load + serial shift | Supports both burst data loading (e.g., configuration registers) and continuous streaming (e.g., sensor telemetry) |
| TTL-compatible input thresholds | VIL ≤ 0.8 V and VIH ≥ 2.0 V at VCC = 4.5 V - ensures reliable interfacing with standard 5 V logic families |
Applications
| Automotive LED Lighting Control | Body Control Module (BCM) I/O Expansion |
|---|---|
|
Use Scenario: Driving 64-channel LED matrix in headlamp assembly using cascaded shift registers. IC Role / Device Role / Timing Role: Serial-to-parallel converter that translates SPI-like microcontroller output into parallel enable signals for LED driver ICs. Use Value: Reduces MCU GPIO count by 8× per device; AEC-Q100 qualification ensures reliability across thermal cycles and vibration profiles. |
Use Scenario: Expanding digital input capability for door lock sensors, window position switches, and mirror controls in BCM. IC Role / Device Role / Timing Role: Parallel-input shift register capturing switch states synchronously on wake-up interrupt. Use Value: Enables single-shot 8-bit snapshot acquisition with deterministic timing - avoids missed edges during low-power sleep exit. |
| Engine Control Unit (ECU) Diagnostic Interface | Instrument Cluster Display Driver |
|
Use Scenario: Serializing diagnostic status bits (e.g., injector health, knock sensor flags) for CAN FD message packing. IC Role / Device Role / Timing Role: High-speed serial output shifter feeding data to UART or CAN transceiver input buffer. Use Value: 25 MHz max clock supports >200 kbps serial throughput - meets ECU diagnostic response time requirements. |
Use Scenario: Driving segmented LCD or OLED display elements in digital instrument clusters with minimal MCU overhead. IC Role / Device Role / Timing Role: Parallel-output shift register converting microcontroller frame buffer bytes into segment enable lines. Use Value: Eliminates software bit-banging; deterministic 23 ns CP→Q7 delay ensures pixel update timing stability across temperature. |
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 |
|---|---|---|---|
| 74HC166D-Q100 | CMOS-level inputs (VIH ≥ 3.15 V @ VCC = 4.5 V); wider 2.0–6.0 V supply range | Better suited for mixed-voltage systems with 3.3 V controllers; less tolerant of slow-rising 5 V signals | Select when interfacing with 3.3 V MCUs or requiring extended VCC flexibility beyond 5 V nominal |
| SN74LV165AQPWRQ1 | 3.3 V only (2.0–5.5 V), 8-bit parallel-load shift register with complementary Q7̅ output | Includes inverted output and higher noise immunity; lacks MR pin - reset handled externally | Prefer for new 3.3 V designs needing Q7̅ for differential signaling or where external reset is acceptable |
Compared with 74HC166D-Q100, the 74HCT166D-Q100 offers tighter TTL-compatible input thresholds for legacy 5 V systems, while SN74LV165AQPWRQ1 provides enhanced noise margin and complementary output at the cost of losing integrated master reset - making it suitable only where system-level reset coordination is feasible.
Availability
74HCT166D-Q100 is available at Aetrix Electronics and suitable for automotive lighting control, body electronics, engine management diagnostics, and instrument cluster display subsystems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74HCT166D-Q100 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 optimized for automotive, industrial, and consumer applications.
The 74HCT166-Q100 belongs to Nexperia's automotive-qualified logic portfolio, designed specifically to meet stringent AEC-Q100 Grade 1 requirements for under-hood and safety-critical electronic control units.
FAQ
What is the function of the MR (master reset) pin?
The MR pin is an asynchronous active-LOW input that forces all eight internal register stages to logic LOW immediately, regardless of clock or enable states. It requires no clock edge and overrides all other inputs, enabling deterministic fail-safe initialization in automotive safety systems. Pull-up resistor (typically 10 kΩ to VCC) is recommended for default HIGH operation.
Can 74HCT166D-Q100 operate at 3.3 V supply?
No - the 74HCT166D-Q100 is specified only for 4.5 V to 5.5 V operation per its Recommended Operating Conditions table. At 3.3 V, input thresholds (VIH ≥ 2.0 V) become marginal and output drive degrades significantly; use 74HC166D-Q100 or 74LV165AQPWRQ1 instead for true 3.3 V compatibility.
How does CE (clock enable) interact with PE (parallel enable)?
CE and PE operate independently: CE gates the clock signal (blocking CP when HIGH), while PE selects data source (parallel load when LOW, serial shift when HIGH). When CE = HIGH, no shifting or loading occurs - even if PE toggles or CP rises. Both must be active (CE = LOW, PE = LOW/HIGH as needed) for functional operation.
Is daisy-chaining supported, and how is it implemented?
Yes - daisy-chaining is supported by connecting Q7 of one device to DS of the next. Each CP rising edge shifts data one position forward across the chain. To load parallel data into multiple devices simultaneously, tie all PE and CP pins together and assert PE = LOW before the first CP edge. All devices load their D0–D7 inputs concurrently.
74HCT166D-Q100J Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HCT
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- 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:
- Parallel to Serial
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
74HCT166D-Q100J FAQ
1.How can I place an order for 74HCT166D-Q100J through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT166D-Q100J 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 74HCT166D-Q100J reliable?
The price and inventory of 74HCT166D-Q100J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT166D-Q100J is usually 5 days.
3.What payment methods are accepted for 74HCT166D-Q100J?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT166D-Q100J transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT166D-Q100J?
74HCT166D-Q100J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT166D-Q100J 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 74HCT166D-Q100J?
For technical support, including 74HCT166D-Q100J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT166D-Q100J requirements.
6.How does Aetrix verify that 74HCT166D-Q100J is sourced from the original manufacturer or authorized distributors?
All 74HCT166D-Q100J 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 74HCT166D-Q100J meets industry standards.
7.What is the process for return or replacement of 74HCT166D-Q100J?
All 74HCT166D-Q100J units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT166D-Q100J, 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 74HCT166D-Q100J part is unused and in its original packaging.
Return procedure for 74HCT166D-Q100J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74HCT166D-Q100J 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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