74HCS166
8-bit parallel-in/serial out shift register with Schmitt-trigger inputs
The 74HCS166 is an 8-bit serial or parallel-in/serial-out shift register. The device features a serial data input (DS), eight parallel data inputs (D0 to D7) and a serial output (Q7). When the parallel enable input (PE) is LOW, the data from D0 to D7 is loaded into the shift register on the next LOW-to-HIGH transition of the clock input (CP). When PE is HIGH, data enters the register serially at DS with each LOW-to-HIGH transition of CP. When the clock enable input (CE) is LOW data is shifted on the LOW-to-HIGH transitions of CP. A HIGH on CE disables the CP input. Inputs include clamp diodes. This enables the use of current limiting resistors to interface inputs to voltages in excess of VCC.
All inputs are Schmitt-trigger inputs, capable of transforming slowly changing input signals into sharply defined, jitter-free output signals.
Features and benefits
Wide supply voltage range from 2.0 V to 6.0 V
- Schmitt-trigger inputs
- Low power consumption
- Typical supply current (ICC) of 100 nA
- Typical input leakage current (II) of ±10 nA
- ±7.8 mA output drive at 6 V
8-bit serial input and 8-bit serial or parallel output
Storage register with 3-state outputs
Shift register with direct clear
- Latch-up performance exceeds 100 mA per JESD 78 Class II Level B
-
Complies with JEDEC standards:
- JESD7A (2.0 V to 6.0 V)
ESD protection:
HBM ANSI/ESDA/JEDEC JS-001 class 3A exceeds 4000 V
CDM ANSI/ESDA/JEDEC JS-002 class C3 exceeds 1500 V
Multiple package options
Specified from -40 °C to +85 °C and from -40 °C to +125 °C
Parametrics
| Type number | VCC (V) | Logic switching levels | Output drive capability (mA) | tpd (ns) | fmax (MHz) | Nr of bits | Power dissipation considerations | Tamb (°C) | Package name |
|---|---|---|---|---|---|---|---|---|---|
| 74HCS166BQ | 2.0 - 6.0 | CMOS | ± 7.8 | 7 | 220 | 8 | low | -40~125 | DHVQFN16 |
| 74HCS166D | 2.0 - 6.0 | CMOS | ± 7.8 | 7 | 220 | 8 | low | -40~125 | SO16 |
| 74HCS166PW | 2.0 - 6.0 | CMOS | ± 7.8 | 7 | 220 | 8 | low | -40~125 | TSSOP16 |
Package
| Type number | Orderable part number, (Ordering code (12NC)) | Status | Marking | Package | Package information | Reflow-/Wave soldering | Packing |
|---|---|---|---|---|---|---|---|
| 74HCS166BQ | 74HCS166BQX (935691473115) |
Active | HCS166 |
DHVQFN16 (SOT763-1) |
SOT763-1 | SOT763-1_115 | |
| 74HCS166D | 74HCS166DJ (935691475118) |
Active | 74HCS166D |
SO16 (SOT109-1) |
SOT109-1 |
SO-SOJ-REFLOW
SO-SOJ-WAVE WAVE_BG-BD-1 |
SOT109-1_118 |
| 74HCS166PW | 74HCS166PWJ (935691476118) |
Active | HCS166 |
TSSOP16 (SOT403-1) |
SOT403-1 |
SSOP-TSSOP-VSO-WAVE
|
SOT403-1_118 |
Environmental information
| Type number | Orderable part number | Chemical content | RoHS | RHF-indicator |
|---|---|---|---|---|
| 74HCS166BQ | 74HCS166BQX | 74HCS166BQ |
|
|
| 74HCS166D | 74HCS166DJ | 74HCS166D |
|
|
| 74HCS166PW | 74HCS166PWJ | 74HCS166PW |
|
|
Documentation (17)
| File name | Title | Type | Date |
|---|---|---|---|
| 74HCS166 | 8-bit parallel-in/serial out shift register with Schmitt-trigger inputs | Data sheet | 2025-06-18 |
| AN90063 | Questions about package outline drawings | Application note | 2025-06-13 |
| SOT763-1 | 3D model for products with SOT763-1 package | Design support | 2019-10-03 |
| SOT109-1 | 3D model for products with SOT109-1 package | Design support | 2020-01-22 |
| SOT403-1 | 3D model for products with SOT403-1 package | Design support | 2020-01-22 |
| 74hcs166 | 74HCS166 IBIS Model | IBIS model | 2025-06-30 |
| Nexperia_package_poster | Nexperia package poster | Leaflet | 2020-05-15 |
| DHVQFN16_SOT763-1_mk | plastic, dual in-line compatible thermal enhanced very thin quad flat package; 16 terminals; 0.5 mm pitch; 3.5 mm x 2.5 mm x 0.85 mm body | Marcom graphics | 2017-01-28 |
| SO16_SOT109-1_mk | plastic, small outline package; 16 leads; 1.27 mm pitch; 9.9 mm x 3.9 mm x 1.35 mm body | Marcom graphics | 2017-01-28 |
| TSSOP16_SOT403-1_mk | plastic, thin shrink small outline package; 16 leads; 0.65 mm pitch; 5 mm x 4.4 mm x 1.1 mm body | Marcom graphics | 2017-01-28 |
| SOT763-1 | plastic, leadless dual in-line compatible thermal enhanced very thin quad flat package; 16 terminals; 0.5 mm pitch; 3.5 mm x 2.5 mm x 1 mm body | Package information | 2023-05-11 |
| SOT109-1 | plastic, small outline package; 16 leads; 1.27 mm pitch; 9.9 mm x 3.9 mm x 1.75 mm body | Package information | 2023-11-07 |
| SOT403-1 | plastic, thin shrink small outline package; 16 leads; 5 mm x 4.4 mm x 1.2 mm body | Package information | 2023-11-08 |
| SO-SOJ-REFLOW | Footprint for reflow soldering | Reflow soldering | 2009-10-08 |
| SO-SOJ-WAVE | Footprint for wave soldering | Wave soldering | 2009-10-08 |
| WAVE_BG-BD-1 | Wave soldering profile | Wave soldering | 2021-09-08 |
| SSOP-TSSOP-VSO-WAVE | Footprint for wave soldering | Wave soldering | 2009-10-08 |
Support
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Models
| File name | Title | Type | Date |
|---|---|---|---|
| SOT763-1 | 3D model for products with SOT763-1 package | Design support | 2019-10-03 |
| SOT109-1 | 3D model for products with SOT109-1 package | Design support | 2020-01-22 |
| SOT403-1 | 3D model for products with SOT403-1 package | Design support | 2020-01-22 |
| 74hcs166 | 74HCS166 IBIS Model | IBIS model | 2025-06-30 |
Ordering, pricing & availability
Sample
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