6.4 Thermal Information

THERMAL METRIC(1)

SN74HC74

SN54HC74

UNIT

D (SOIC)

DB

(SSOP)

N (PDIP)

NS (SO)

PW

(TSSOP)

J (CDIP)

W (CFP)

FK

(LCCC)

14 PINS

14 PINS

14 PINS

14 PINS

14 PINS

14 PINS

14 PINS

20 PINS

RθJA

Junction-to-ambient

thermal resistance

133.6

107.7

61.9

122.6

151.7

N/A

N/A

N/A

°C/W

Rθ

JC(to

p)

Junction-to-case (top)

thermal resistance

89.0

57.4

49.7

81.8

79.4

15.05

14.65

5.61

°C/W

RθJB

Junction-to-board

thermal resistance

89.5

57.9

41.7

83.8

94.7

N/A

N/A

N/A

°C/W

ΨJT

Junction-to-top

characterization

parameter

45.5

17.6

29.3

45.4

25.2

N/A

N/A

N/A

°C/W

ΨJB

Junction-to-board

characterization

parameter

89.1

57.2

41.4

83.4

94.1

N/A

N/A

N/A

°C/W

Rθ

JC(bo

t)

Junction-to-case

(bottom) thermal

resistance

N/A

N/A

N/A

N/A

N/A

N/A

N/A

N/A

°C/W

(1)

For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application

report.

6.5 Electrical Characteristics - 74

over operating free-air temperature range; typical values measured at TA = 25°C (unless otherwise noted).

PARAMETER

TEST CONDITIONS

VCC

Operating free-air temperature (TA)

UNIT

25°C

-40°C to 85°C

MIN

TYP

MAX

MIN

TYP

MAX

VOH

High-level

output voltage

VI = VIH

or VIL

IOH = –20 µA

2 V

1.9

1.998

1.9

V

4.5 V

4.4

4.499

4.4

6 V

5.9

5.999

5.9

IOH = –4 mA

4.5 V

3.98

4.3

3.84

IOH = –5.2 mA

6 V

5.48

5.8

5.34

VOL

Low-level output

voltage

VI = VIH

or VIL

IOL = 20 µA

2 V

0.002

0.1

0.1

V

4.5 V

0.001

0.1

0.1

6 V

0.001

0.1

0.1

IOL = 4 mA

4.5 V

0.17

0.26

0.33

IOL = 5.2 mA

6 V

0.15

0.26

0.33

II

Input leakage

current

VI = VCC or 0

6 V

±0.1

±1

µA

ICC

Supply current

VI = VCC

or 0

IO = 0

6 V

4

40

µA

Ci

Input

capacitance

2 V to 6 V

3

10

10

pF

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SN74HC74, SN54HC74

SCLS094F – DECEMBER 1982 – REVISED JUNE 2021

Copyright © 2021 Texas Instruments Incorporated

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