74HC166; 74HCT166

8-bit parallel-in/serial out shift register

The 74HC166; 74HCT166 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 which enable the use of current limiting resistors to interface inputs to voltages in excess of V_CC.

Features and benefits

Wide supply voltage range from 2.0 V to 6.0 V
CMOS low power dissipation
High noise immunity
Latch-up performance exceeds 100 mA per JESD 78 Class II Level B
Synchronous parallel-to-serial applications
Synchronous serial input for easy expansion
Input levels:
- For 74HC166: CMOS level
- For 74HCT166: TTL level
Complies with JEDEC standards:
- JESD8C (2.7 V to 3.6 V)
- JESD7A (2.0 V to 6.0 V)
ESD protection:
- HBM: ANSI/ESDA/JEDEC JS-001 class 2 exceeds 2000 V
- CDM: ANSI/ESDA/JEDEC JS-002 class C3 exceeds 1000 V
Specified from -40 °C to +85 °C and from -40 °C to +125 °C

Parametrics

Type number	Product status	V_CC (V)	Logic switching levels	Output drive capability (mA)	t_pd (ns)	f_max (MHz)	Nr of bits	Power dissipation considerations	T_amb (°C)	R_th(j-a) (K/W)	Ψ_th(j-top) (K/W)	R_th(j-c) (K/W)	Package name
74HC166D	Production	2.0 - 6.0	CMOS	± 5.2	15	63	8	low	-40~125	74	1.2	32	SO16
74HC166PW	Production	2.0 - 6.0	CMOS	± 5.2	15	63	8	low	-40~125	108	1.0	35.9	TSSOP16
74HCT166D	Production	4.5 - 5.5	TTL	± 4	23	50	8	low	-40~125	76	2.1	34	SO16
74HCT166PW	Production	4.5 - 5.5	TTL	± 4	23	50	8	low	-40~125	108	1.0	36	TSSOP16

Package

Type number	Package	Package information	Reflow-/Wave soldering	Packing	Status	Marking	Orderable part number, (Ordering code (12NC))
74HC166D	SO16 (SOT109-1)	SOT109-1	SO-SOJ-REFLOW SO-SOJ-WAVE	SOT109-1_653	Active	74HC166D	74HC166D,653 ( 9337 145 50653 )
74HC166PW	TSSOP16 (SOT403-1)	SOT403-1	SSOP-TSSOP-VSO-WAVE	SOT403-1_118	Active	HC166	74HC166PW,118 ( 9351 889 60118 )
74HCT166D	SO16 (SOT109-1)	SOT109-1	SO-SOJ-REFLOW SO-SOJ-WAVE	SOT109-1_653	Active	74HCT166D	74HCT166D,653 ( 9337 150 30653 )
74HCT166PW	TSSOP16 (SOT403-1)	SOT403-1	SSOP-TSSOP-VSO-WAVE	SOT403-1_118	Active	4HCT166	74HCT166PWJ ( 9356 912 22118 )

The variants in the table below are discontinued. See the table Discontinuation information for more information.

Type number	Package	Package information	Reflow-/Wave soldering	Packing	Status	Marking	Orderable part number, (Ordering code (12NC))
74HC166D	SO16 (SOT109-1)	SOT109-1	SO-SOJ-REFLOW SO-SOJ-WAVE	SOT109-1_652	Withdrawn / End-of-life	74HC166D	74HC166D,652 ( 9337 145 50652 )
74HC166PW	TSSOP16 (SOT403-1)	SOT403-1	SSOP-TSSOP-VSO-WAVE	SOT403-1_112	Withdrawn / End-of-life	HC166	74HC166PW,112 ( 9351 889 60112 )

Discontinuation information

Type number	Orderable part number, (Ordering code (12NC))	Last time buy date	Last time delivery date	Replacement product
74HC166D	933714550652	2021-12-31	2022-06-30	74HC166D
74HC166PW	935188960112	2021-12-31	2022-06-30	74HC166PW
74HCT166D	933715030652	2021-12-31	2022-06-30	74HCT166D

Environmental information

Type number	Orderable part number	Chemical content	Leadfree conversion date
74HC166D	74HC166D,653	74HC166D	week 6, 2004
74HC166PW	74HC166PW,118	74HC166PW	week 10, 2005
74HCT166D	74HCT166D,653	74HCT166D	week 6, 2004
74HCT166PW	74HCT166PWJ	74HCT166PW

The variants in the table below are discontinued. See the table Discontinuation information for more information.

Type number	Orderable part number	Chemical content	RoHS	RHF-indicator	Leadfree conversion date
74HC166D	74HC166D,652	74HC166D			week 6, 2004
74HC166PW	74HC166PW,112	74HC166PW			week 10, 2005

Quality and reliability disclaimer

Documentation (9)

File name	Title	Type	Date
74HC_HCT166	8-bit parallel-in/serial out shift register	Data sheet	2024-03-11
AN11044	Pin FMEA 74HC/74HCT family	Application note	2019-01-09
HCT_USER_GUIDE	HC/T User Guide	User manual	1997-10-31
SO-SOJ-WAVE	Footprint for wave soldering	Wave soldering	2009-10-08
SO-SOJ-REFLOW	Footprint for reflow soldering	Reflow soldering	2009-10-08
WAVE_BG-BD-1	Wave soldering profile	Wave soldering	2021-09-08
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
SSOP-TSSOP-VSO-WAVE	Footprint for wave soldering	Wave soldering	2009-10-08

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