74HC540; 74HCT540

Octal buffer/line driver; 3-state; inverting

The 74HC540; 74HCT540 is an 8-bit inverting buffer/line driver with 3-state outputs. The device features two output enables (OE1 and OE2). A HIGH on OEn causes the outputs to assume a high-impedance OFF-state. Inputs include clamp diodes. This enables 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
Inverting outputs
Input levels:
- For 74HC540: CMOS level
- For 74HCT540: 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 JESD22-A114F exceeds 2 kV
- MM JESD22-A115-A exceeds 200 V
Multiple package options
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)	f_max (MHz)	Nr of bits	Power dissipation considerations	T_amb (°C)	R_th(j-a) (K/W)	R_th(j-c) (K/W)	Package name
74HC540D	Production	2.0 - 6.0	CMOS	± 7.8	36	8	low	-40~125	70	46	SO20
74HC540PW	Production	2.0 - 6.0	CMOS	± 7.8	36	8	low	-40~125	112	39.4	TSSOP20
74HCT540D	Production	4.5 - 5.5	TTL	± 6	36	8	low	-40~125	70	46	SO20
74HCT540PW	Production	4.5 - 5.5	TTL	± 6	36	8	low	-40~125	70	46	TSSOP20

Package

Type number	Package	Package information	Reflow-/Wave soldering	Packing	Status	Marking	Orderable part number, (Ordering code (12NC))
74HC540D	SO20 (SOT163-1)	SOT163-1	WAVE_BG-BD-1	SOT163-1_653	Active	74HC540D	74HC540D,653 ( 9337 154 90653 )
74HC540PW	TSSOP20 (SOT360-1)	SOT360-1	SSOP-TSSOP-VSO-WAVE	SOT360-1_118	Active	74HC540	74HC540PWJ ( 9356 912 19118 )
74HCT540D	SO20 (SOT163-1)	SOT163-1	WAVE_BG-BD-1	SOT163-1_653	Active	74HCT540D	74HCT540D,653 ( 9337 156 00653 )
74HCT540PW	TSSOP20 (SOT360-1)	SOT360-1	SSOP-TSSOP-VSO-WAVE	SOT360-1_118	Active	4HCT540	74HCT540PWJ ( 9356 912 11118 )

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))
74HC540D	SO20 (SOT163-1)	SOT163-1	WAVE_BG-BD-1	SOT163-1_652	Withdrawn / End-of-life	74HC540D	74HC540D,652 ( 9337 154 90652 )
74HCT540D	SO20 (SOT163-1)	SOT163-1	WAVE_BG-BD-1	SOT163-1_652	Withdrawn / End-of-life	74HCT540D	74HCT540D,652 ( 9337 156 00652 )

Discontinuation information

Type number	Orderable part number, (Ordering code (12NC))	Last time buy date	Last time delivery date	Replacement product	Status	Comments
74HC540D	933715490652	2021-12-31	2022-06-30	74HC540D
74HCT540D	933715600652	2021-12-31	2022-06-30	74HCT540D

Environmental information

Type number	Orderable part number	Chemical content	Leadfree conversion date
74HC540D	74HC540D,653	74HC540D	week 30, 2004
74HC540PW	74HC540PWJ	74HC540PW
74HCT540D	74HCT540D,653	74HCT540D	week 30, 2004
74HCT540PW	74HCT540PWJ	74HCT540PW

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
74HC540D	74HC540D,652	74HC540D			week 30, 2004
74HCT540D	74HCT540D,652	74HCT540D			week 30, 2004

Quality and reliability disclaimer

Documentation (7)

File name	Title	Type	Date
74HC_HCT540	Octal buffer/line driver; 3-state; inverting	Data sheet	2021-10-19
AN11044	Pin FMEA 74HC/74HCT family	Application note	2019-01-09
HCT_USER_GUIDE	HC/T User Guide	User manual	1997-10-31
SSOP-TSSOP-VSO-WAVE	Footprint for wave soldering	Wave soldering	2009-10-08
SOT360-1	plastic, thin shrink small outline package; 20 leads; 0.65 mm pitch; 6.5 mm x 4.4 mm x 1.1 mm body	Package information	2022-06-21
SOT163-1	plastic, small outline package; 20 leads; 1.27 mm pitch; 12.8 mm x 7.5 mm x 2.65 mm body	Package information	2022-06-20
WAVE_BG-BD-1	Wave soldering profile	Wave soldering	2021-09-08

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