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SN74LS245DW on a board, in 3D

SN74LS245DW

Texas Instruments

0℃~+70℃ 12ns@5V,45pF 15mA 24mA 4.75V~5.25V 74LS 8 Bidirectional Schmitt trigger Tri-State SOIC-20-300mil Buffers, Drivers, Receivers, Transceivers ROHS

Extended
DatasheetJLCPCBLCSCti/SN74LS245DW
Category
Buffers, Drivers, Receivers, Transceivers
Package
SOIC-20-300mil
Pins
20

Overview

The SN74LS245DW is a buffers, Drivers, Receivers, Transceiver made by Texas Instruments in a SOIC-20-300mil package with 20 pins. 0℃~+70℃ 12ns@5V,45pF 15mA 24mA 4.75V~5.25V 74LS 8 Bidirectional Schmitt trigger Tri-State SOIC-20-300mil Buffers, Drivers, Receivers, Transceivers ROHS.

PCBKit's library has its KiCad symbol (EasyEDA_Cloud:SN74ALS1640AN, from EasyEDA) and its footprint (Package_SO:SOIC-20W_7.5x12.8mm_P1.27mm, from KiCad's library), ready for a KiCad board. 3,665 are in stock at JLCPCB (part C129580).

Symbol

DIR1A12A23A34A45A56A67A78A89GND10B811B712B613B514B415B316B217B118OE#19VCC20
EasyEDA_Cloud:SN74ALS1640ANFrom EasyEDA

Footprint

1234567891011121314151617181920
Package_SO:SOIC-20W_7.5x12.8mm_P1.27mmFrom KiCad's library

From the datasheet

13
Supply, least
4.75 V · VCC, recommended operating min · p. 4
Supply, most
5.25 V · VCC, recommended operating max · p. 4
Supply, absolute maximum
7 V · VCC, absolute max · p. 4
Works from
0 °C · Operating free-air temperature min · p. 4
Works up to
70 °C · Operating free-air temperature max · p. 4
Junction, hottest
150 °C · Operating virtual junction temperature max · p. 4
Takes working
62 mA · VCC, outputs low and open, typical · p. 5
Takes at most
95 mA · VCC, outputs at high Z and open, max · p. 5
A pin gives at most
24 mA · Low-level output sink current max · p. 4
A pin gives at most
15 mA · High-level output source current magnitude max · p. 4
Junction to air (DW)
79 K/W · Junction-to-ambient thermal resistance · p. 4
Junction to case (DW)
44.4 K/W · Junction-to-case (top) thermal resistance · p. 4
Junction to board (DW)
46.9 K/W · Junction-to-board thermal resistance · p. 4

What it is and has

4
Function
Octal bus transceiver with 3-state outputs · p. 1
Inputs
PNP inputs reduce DC loading on bus lines · p. 1
Bus input hysteresis
Improves noise margins · p. 1
Package
SOIC (20), 12.80 mm × 7.50 mm · p. 1

Around it

1
cap 0.1 µF
between VCC and GND; Supply bypass capacitor; install as close to the power pin as possible. · p. 12

Specifications

39
ParameterConditionsAs printedPage
Supply voltage VCCOver operating free-air temperature range; with respect to GNDmax 7 V4
Input voltage VIOver operating free-air temperature range; with respect to GNDmax 7 V4
Operating virtual junction temperature TJmax 150 °C4
Storage temperature Tstgmin -65 · max 150 °C4
Electrostatic discharge V(ESD)Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001min -2500 · max 2500 V4
Electrostatic discharge V(ESD)Charged-device model (CDM), per JEDEC specification JESD22-C101min -1500 · max 1500 V4
Supply voltage VCCSN74LS245min 4.75 · typ 5 · max 5.25 V4
High-level output current IOHSN74LS245max -15 mA4
Low-level output current IOLSN74LS245max 24 mA4
Operating free-air temperature TASN74LS245min 0 · max 70 °C4
Junction-to-ambient thermal resistance RθJADW (SOIC), 20 PINStyp 79 °C/W4
Junction-to-case (top) thermal resistance RθJC(top)DW (SOIC), 20 PINStyp 44.4 °C/W4
Junction-to-board thermal resistance RθJBDW (SOIC), 20 PINStyp 46.9 °C/W4
Junction-to-top characterization parameter ψJTDW (SOIC), 20 PINStyp 18 °C/W4
Junction-to-board characterization parameter ψJBDW (SOIC), 20 PINStyp 46.3 °C/W4
High-level input voltage VIHOver recommended operating free-air temperature rangemin 2 V5
Low-level input voltage VILSN74LS245; over recommended operating free-air temperature rangemax 0.8 V5
Input clamp voltage VIKVCC = MIN, II = –18 mAmax -1.5 V5
Hysteresis (VT+ – VT–)A or B; VCC = MINmin 0.2 · typ 0.4 V5
High-level output voltage VOHVCC = MIN, VIL = VIL(max), VIH = 2 V, IOH = –3 mAmin 2.4 · typ 3.4 V5
High-level output voltage VOHVCC = MIN, VIL = VIL(max), VIH = 2 V, IOH = MAXmin 2 V5
Low-level output voltage VOLVCC = MIN, VIH = 2 V, VIL = VIL(max), IOL = 12 mAmax 0.4 V5
Low-level output voltage VOLSN74LS245; VCC = MIN, VIH = 2 V, VIL = VIL(max), IOL = 24 mAmax 0.5 V5
Off-state output current, high-level voltage applied IOZHVCC = MAX, OE at 2 V, VO = 2.7 Vmax 20 uA5
Off-state output current, low-level voltage applied IOZLVCC = MAX, OE at 2 V, VO = 0.4 Vmax -200 uA5
Input current at maximum input voltage IIA or B; VCC = MAX, VI = 5.5 Vmax 0.1 mA5
Input current at maximum input voltage IIDIR or OE; VCC = MAX, VI = 7 Vmax 0.1 mA5
High-level input current IIHVCC = MAX, VIH = 2.7 Vmax 20 uA5
Low-level input current IILVCC = MAX, VIL = 0.4 Vmax -0.2 mA5
Short-circuit output current IOSVCC = MAX; no more than one output shorted at a time, for no more than one secondmin -40 · max -225 mA5
Supply current ICCVCC = MAX, outputs open; total, outputs hightyp 48 · max 70 mA5
Supply current ICCVCC = MAX, outputs open; total, outputs lowtyp 62 · max 90 mA5
Supply current ICCVCC = MAX, outputs open; outputs at high Ztyp 64 · max 95 mA5
Propagation delay time, low- to high-level output tPLHVCC = 5 V, TA = 25°C; CL = 45 pF, RL = 667 Ωtyp 8 · max 12 ns5
Propagation delay time, high- to low-level output tPHLVCC = 5 V, TA = 25°C; CL = 45 pF, RL = 667 Ωtyp 8 · max 12 ns5
Output enable time to low level tPZLVCC = 5 V, TA = 25°C; CL = 45 pF, RL = 667 Ωtyp 27 · max 40 ns5
Output enable time to high level tPZHVCC = 5 V, TA = 25°C; CL = 45 pF, RL = 667 Ωtyp 25 · max 40 ns5
Output disable time from low level tPLZVCC = 5 V, TA = 25°C; CL = 5 pF, RL = 667 Ωtyp 15 · max 25 ns5
Output disable time from high level tPHZVCC = 5 V, TA = 25°C; CL = 5 pF, RL = 667 Ωtyp 15 · max 28 ns5

Pins, by the datasheet

20
1 DIR
Controls signal direction; Low = Bx to Ax, High = Ax to Bx. · p. 3
2 A1
Channel 1, A side. · p. 3
3 A2
Channel 2, A side. · p. 3
4 A3
Channel 3, A side. · p. 3
5 A4
Channel 4, A side. · p. 3
6 A5
Channel 5, A side. · p. 3
7 A6
Channel 6, A side. · p. 3
8 A7
Channel 7, A side. · p. 3
9 A8
Channel 8, A side. · p. 3
10 GND
Ground. · p. 3
11 B8
Channel 8, B side. · p. 3
12 B7
Channel 7, B side. · p. 3
13 B6
Channel 6, B side. · p. 3
14 B5
Channel 5, B side. · p. 3
15 B4
Channel 4, B side. · p. 3
16 B3
Channel 3, B side. · p. 3
17 B2
Channel 2, B side. · p. 3
18 B1
Channel 1, B side. · p. 3
19 OE
Active low output enable; Low = all channels active, High = all channels disabled (high impedance). · p. 3
20 VCC
Power supply. · p. 3

Ordering codes, by the datasheet

8
SN74LS245DW
SOIC (DW), 20 pins · Obsolete; 0 to 70 °C · p. 15
SN74LS245DWR
SOIC (DW), 20 pins · Active; 2000, LARGE T&R; 0 to 70 °C · p. 15
SN74LS245DWR.A
SOIC (DW), 20 pins · Active; 2000, LARGE T&R; 0 to 70 °C · p. 15
SN74LS245N
PDIP (N), 20 pins · Active; 20, TUBE; 0 to 70 °C · p. 15
SN74LS245N.A
PDIP (N), 20 pins · Active; 20, TUBE; 0 to 70 °C · p. 15
SN74LS245NE4
PDIP (N), 20 pins · Active; 20, TUBE; 0 to 70 °C · p. 15
SN74LS245NSR
SOP (NS), 20 pins · Active; 2000, LARGE T&R; 0 to 70 °C · p. 15
SN74LS245NSR.A
SOP (NS), 20 pins · Active; 2000, LARGE T&R; 0 to 70 °C · p. 15

Parameters

20
Channel Type
Bidirectional
Current - Output High(IOH)
15mA
Current - Output Low(IOL)
24mA
Current - Supply(Max)
95mA
Features
Output enable
Input type
Schmitt trigger
Junction Temperature(Max)
150℃
Logic Family
74LS
Number of Bits per Element
8
Number of Elements
1
Operating Temperature
0℃~+70℃
Output Current per Pin(Max)
24mA
Propagation Delay
12ns@5V,45pF
Quiescent Current
62mA
Thermal Resistance(Junction to Ambient)
79℃/W
Thermal Resistance(Junction to Board)
46.9℃/W
Thermal Resistance(Junction to Case)
44.4℃/W
Voltage - Supply
4.75V~5.25V
Voltage - Supply(Absolute Max)
7V
output type
Tri-State

Order codes

2

Pinout

20
The pins of the SN74LS245DW
PinNameType
1DIRUnspecified
2A1Unspecified
3A2Unspecified
4A3Unspecified
5A4Unspecified
6A5Unspecified
7A6Unspecified
8A7Unspecified
9A8Unspecified
10GNDUnspecified
11B8Unspecified
12B7Unspecified
13B6Unspecified
14B5Unspecified
15B4Unspecified
16B3Unspecified
17B2Unspecified
18B1Unspecified
19OE#Unspecified
20VCCUnspecified

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Questions

Is there a KiCad symbol and footprint for the SN74LS245DW?

Yes. The symbol is EasyEDA_Cloud:SN74ALS1640AN and the footprint Package_SO:SOIC-20W_7.5x12.8mm_P1.27mm, both drawn on this page. PCBKit places them on a board for you when you design with it.

What package is the SN74LS245DW?

SOIC-20-300mil, with 20 pins. Its footprint is drawn on this page.

Where is the SN74LS245DW datasheet?

Texas Instruments publishes it: the Datasheet link on this page opens it.

Where can I order the SN74LS245DW?

JLCPCB lists it as part C129580, with 3,665 in stock; the sellers' links on this page open their listings.

What can replace the SN74LS245DW?

Parts like it in the library: the 74HC245D by Nexperia, the 74HCT244D by Nexperia, the 74HCT245D by Nexperia and the SN74HC244DW by Texas Instruments. Check their datasheets: a part that fits the footprint may still differ in its ratings.

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