1. General description
The 74HC21 is a dual 4-inp ut AND gate. Inputs include clamp diodes. This enables the
use of current limit ing res ist ors to interface inputs to voltages in excess of VCC.
2. Features and benefits
Low-power dissipation
Complies with JEDEC standard no. 7A
ESD protection:
HBM JESD22-A114E exceeds 2000 V
MM JESD22-A115-A exceeds 200 V
Multiple package options
Specified from 40 Cto+85C and from 40 Cto+125C.
3. Ordering information
74HC21
Dual 4-input AND gate
Rev. 7 — 30 November 2015 Product data sheet
Table 1. Ordering information
Type number Package
Temperature range Name Description Version
74HC21D 40 C to +125 C SO14 plastic small outline package; 14 leads;
body width 3.9 mm SOT108-1
74HC21DB 40 C to +125 C SSOP14 plastic shrink small outline package; 14 leads;
body width 5.3 mm SOT337-1
74HC21PW 40 C to +125 C TSSOP14 plastic thin shrink small outlin e package; 14 leads;
body width 4.4 mm SOT402-1
© Nexperia B.V. 2017. All rights reserved
74HC21 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 7 — 30 November 2015 2 of 14
Nexperia 74HC21
Dual 4-input AND gate
4. Functional diagram
5. Pinning information
5.1 Pinning
Fig 1. Functional diagram Fig 2. Logic symbol
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Fig 3. IEC Logic symbol Fig 4. Logic diagram
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© Nexperia B.V. 2017. All rights reserved
74HC21 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 7 — 30 November 2015 3 of 14
Nexperia 74HC21
Dual 4-input AND gate
5.2 Pin description
6. Functional description
[1] H = HIGH voltage level; L = LOW voltage level; X = don’t care.
7. Limiting values
[1] The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
[2] For SO14 package: Ptot derates linearly with 8 mW/K above 70 C.
For (T)SSOP14 packages: Ptot derates linearly with 5.5 mW/K above 60 C.
Table 2. Pin description
Symbol Pin Description
1A, 1B, 1C, 1D 1, 2, 4, 5 data input
n.c. 3, 11 not connected
1Y 6 data output
GND 7 ground (0 V)
2Y 8 data output
2A, 2B, 2C, 2D 9, 10, 12, 13 data input
VCC 14 supply voltage
Table 3. Function table[1]
Input Output
nA nB nC nD nY
LXXXL
XLXXL
XXLXL
XXXLL
HHHHH
Table 4. Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134). Voltages are referenced to GND (ground = 0 V).
Symbol Parameter Conditions Min Max Unit
VCC supply voltage 0.5 +7 V
IIK input clamping current VI < 0.5 V or VI>V
CC +0.5 V [1] -20 mA
IOK output clamping current VO<0.5 V or VO>V
CC +0.5V [1] -20 mA
IOoutput curren t 0.5 V < VO < VCC +0.5V - 25 mA
ICC supply current - 50 mA
IGND ground current 50 - mA
Tstg storage temperature 65 +150 C
Ptot total power dissipation SO14 and (T)SSOP14 packages [2] -500mW
© Nexperia B.V. 2017. All rights reserved
74HC21 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 7 — 30 November 2015 4 of 14
Nexperia 74HC21
Dual 4-input AND gate
8. Recommended operating conditions
9. Static characteristics
Table 5. Recommended operating con ditions
Voltages are referenced to GND (ground = 0 V)
Symbol Parameter Conditions Min Typ Max Unit
VCC supply voltage 2.0 5.0 6.0 V
VIinput voltage 0 - VCC V
VOoutput voltage 0 - VCC V
t/V input transition rise and fall
rate VCC = 2.0 V - - 625 ns/V
VCC = 4.5 V - 1.67 139 ns/V
VCC = 6.0 V - - 83 ns/V
Tamb ambient temperature 40 - +125 C
Table 6. Static characteristics
At recommended operating conditions; voltages are referenced to GND (ground = 0 V).
Symbol Parameter Conditions 25 C40 C to +85 C40 C to +125 CUnit
Min Typ Max Min Max Min Max
VIH HIGH-level
input voltage VCC = 2.0 V 1.5 1.2 - 1.5 - 1.5 - V
VCC = 4.5 V 3.15 2.4 - 3.15 - 3.15 - V
VCC = 6.0 V 4.2 3.2 - 4.2 - 4.2 - V
VIL LOW-level
input voltage VCC = 2.0 V - 0.8 0.5 - 0.5 - 0.5 V
VCC = 4.5 V - 2.1 1.35 - 1.35 - 1.35 V
VCC = 6.0 V - 2.8 1.8 - 1.8 - 1.8 V
VOH HIGH-level
output voltage VI = VIH or VIL
IO = 20 A; VCC = 2.0 V 1.9 2.0 - 1.9 - 1.9 - V
IO = 20 A; VCC = 4.5 V 4.4 4.5 - 4.4 - 4.4 - V
IO = 20 A; VCC = 6.0 V 5.9 6.0 - 5.9 - 5.9 - V
IO = 4.0 mA; VCC = 4.5 V 3.98 4.32 - 3.84 - 3.7 - V
IO = 5.2 mA; VCC = 6.0 V 5.48 5.81 - 5.34 - 5.2 - V
VOL LOW-level
output voltage VI = VIH or VIL
IO = 20 A; VCC = 2.0 V - 0 0.1 - 0.1 - 0.1 V
IO = 20 A; VCC = 4.5 V - 0 0.1 - 0.1 - 0.1 V
IO = 20 A; VCC = 6.0 V - 0 0.1 - 0.1 - 0.1 V
IO = 4.0 mA; VCC = 4.5 V - 0.15 0.26 - 0.33 - 0.4 V
IO = 5.2 mA; VCC = 6.0 V - 0.16 0.26 - 0.33 - 0.4 V
IIinput leakage
current VI = VCC or GND;
VCC =6.0V --0.1 - 1-1A
ICC supply current VI = VCC or GND; IO=0A;
VCC =6.0V --2.0- 20 - 40A
CIinput
capacitance -3.5- - - - -pF
© Nexperia B.V. 2017. All rights reserved
74HC21 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 7 — 30 November 2015 5 of 14
Nexperia 74HC21
Dual 4-input AND gate
10. Dynamic characteristics
[1] tpd is the same as tPHL and tPLH.
[2] tt is the same as tTHL and tTLH.
[3] CPD is used to determine the dynamic power dissipation (PD in W):
PD=C
PD VCC2fiN+ (CLVCC2fo) where:
fi= input frequency in MHz;
fo= output frequency in MHz;
CL= output load capacitance in pF;
VCC = supply voltage in V;
N = number of inputs switching;
(CLVCC2fo) = sum of outputs.
Table 7. Dynamic characteristics
GND = 0 V; test circuit see Figure 8.
Symbol Parameter Conditions 25 C40 C to +85 C40 C to +125 CUnit
Min Typ Max Min Max Min Max
tpd propagation
delay nA, nB, nC or nD to nY;
see Figure 7 [1]
VCC = 2.0 V - 33 110 - 140 - 165 ns
VCC = 4.5 V - 12 22 - 28 - 33 ns
VCC = 6.0 V - 10 19 - 24 - 28 ns
VCC =5.0V; C
L=15pF-10-----ns
tttransition time nY output; see Figure 7 [2]
VCC = 2.0 V - 19 75 - 95 - 110 ns
VCC = 4.5 V - 7 15 - 1 9 - 22 ns
VCC = 6.0 V - 6 13 - 1 6 - 19 ns
CPD power
dissipation
capacitance
VI= GND to VCC [3] -15-----pF
© Nexperia B.V. 2017. All rights reserved
74HC21 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 7 — 30 November 2015 6 of 14
Nexperia 74HC21
Dual 4-input AND gate
11. Waveforms
Measurement points are given in Table 8.
VOL and VOH are typical voltage output levels that occur with the output load.
Fig 7. Waveforms showing the input (nA, nB, nC, nD) to output (nY) propagation delays and the output
transition times
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Table 8. Measur ement points
Type Input Output
VMVMVXVY
74HC21 0.5VCC 0.5VCC 0.1VCC 0.9VCC
© Nexperia B.V. 2017. All rights reserved
74HC21 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 7 — 30 November 2015 7 of 14
Nexperia 74HC21
Dual 4-input AND gate
Test data is given in Table 9.
Definitions test circuit:
RT = termination resistance should be equal to output impedance Zo of the pulse generator.
CL = load capacitance including jig and probe capacitance.
Fig 8. Test circuit for measuring switching times
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Table 9. Test data
Type Input Load Test
VItr, tfCL
74HC21 VCC 6.0 ns 15 pF, 50 pF tPLH, tPHL
© Nexperia B.V. 2017. All rights reserved
74HC21 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 7 — 30 November 2015 8 of 14
Nexperia 74HC21
Dual 4-input AND gate
12. Package outline
Fig 9. Package outline SOT108-1 (SO14)
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© Nexperia B.V. 2017. All rights reserved
74HC21 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 7 — 30 November 2015 9 of 14
Nexperia 74HC21
Dual 4-input AND gate
Fig 10. Package outline SOT337-1 (SSOP14)
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© Nexperia B.V. 2017. All rights reserved
74HC21 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 7 — 30 November 2015 10 of 14
Nexperia 74HC21
Dual 4-input AND gate
Fig 11. Package outline SOT402-1 (TSSOP14)
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© Nexperia B.V. 2017. All rights reserved
74HC21 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 7 — 30 November 2015 11 of 14
Nexperia 74HC21
Dual 4-input AND gate
13. Abbreviations
14. Revision history
Table 10 . Abbreviations
Acronym Description
CMOS Complementary Metal Oxide Semiconductor
DUT Device Under Test
ESD ElectroSt atic Discharge
HBM Human Body Model
MM Machine Model
TTL Transistor-Transistor Logic
Table 11. Revision history
Document ID Release date Data sheet status Change notice Supersedes
74HC21 v.7 20151130 Product data sheet - 74HC21 v.6
Modifications: •Type numbers 74HC21N (SOT27-1) removed.
74HC21 v.6 20130208 Product data sheet - 74HC21 v.5
Modifications: Section 2: Typo corrected in the specified temperature range.
74HC21 v.5 20090507 Product data sheet - 74HC21 v.4
Modifications: Table 1: Type number 74HCT21PW changed to 74HC21PW.
74HC21 v.4 20090407 Product data sheet - 74HC21 v.3
Modifications: •The format of this data sheet has been redesigned to comply with the new identity guidelines
of NXP Semiconductors.
•Legal texts have been adapted to the new company name where appropriate.
•Added type number 74HC21PW (TSSOP14 package).
74HC21 v.3 20041112 Product data sheet - 74HC_HCT21_CNV v.2
74HC_HCT21_CNV v.2 19970828 Product specification - 74HC_HCT21 v.1
74HC_HCT21 v.1 19901201 Product specification - -
© Nexperia B.V. 2017. All rights reserved
74HC21 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 7 — 30 November 2015 12 of 14
Nexperia 74HC21
Dual 4-input AND gate
15. Legal information
15.1 Data sheet status
[1] Please consult the most recently issued document before initiating or completing a design.
[2] The term ‘short data sheet’ is explained in section “Definitions”.
[3] The product status of de vice(s) descr ibed in th is document m ay have cha nged since thi s document w as publish ed and may di ffe r in case of multiple devices. The latest product status
information is available on the Internet at URL http://www.nexperia.com.
15.2 Definitions
Draft — The document is a draft version only. The content is still under
internal review and subject to formal approval, which may result in
modifications or additions. Nexperia does not give any
representations or warranties as to the accuracy or completeness of
information included herein and shall have no liab ility for the consequences of
use of such information.
Short data sheet — A short data sheet is an extract from a full data sheet
with the same product type number(s) and tit le. A short data sh eet is intended
for quick reference only and shou ld not b e relied u pon to cont ain det ailed and
full information. For detailed and full information se e the relevant full data
sheet, which is available on request via the local Nexperia sales
office. In case of any inconsistency or conflict with the short data sheet, the
full data sheet shall pre va il.
Product specificat io n — The information and data provided in a Product
data sheet shall define the specification of the product as agreed between
Nexperia and its customer, unless Nexperia and
customer have explicitly agreed otherwise in writing. In no event however,
shall an agreement be valid in which the Nexperia product is
deemed to off er functions and qualities beyond those described in the
Product data sheet.
15.3 Disclaimers
Limited warr a nty and liability — Information in this document is believed to
be accurate and reliable. However, Nexperia does not give any
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In no event shall Nexperia be liable for any indirect, incidental,
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Notwithstanding any damages that customer might incur for any reason
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Right to make changes — Nexperia reserves the right to make
changes to information published in this document, including without
limitation specifications and product descriptions, at any time and without
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damage. Nexperia and its suppliers accept no liability for
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applications and ther efore such inclu sion and/or use is at the cu stomer’s own
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Applications — Applications that are described herein for any of these
products are for illustrative purposes only. Nexperia makes no
representation or warranty that such applications will be suitable for the
specified use without further testing or modification.
Customers are responsible for the design and ope ration of their applications
and products using Nexperia products, and Nexperia
accepts no liability for any assistance with applications or customer product
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product is suitable and fit for the customer’s applications and
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Nexperia does not accept any liability related to any default,
damage, costs or problem which is based on any weakness or default in the
customer’s applications or products, or the application or use by customer’s
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testing for the customer’s applications and products using Nexperia
products in order to avoid a default of the applications and
the products or of the application or use by customer’s third party
customer(s). Nexperia does not accept any liability in this respect.
Limiting values — Stress above one or more limiting values (as defined in
the Absolute Maximum Ratings System of IEC 60134) will cause permanent
damage to the device. Limiting values are stress ratings only and (proper)
operation of the device at these or any other conditions above those given in
the Recommended operating conditions section (if present) or the
Characteristics sections of this document is not warranted. Constant or
repeated exposure to limiting values will permanently and irreversibly affect
the quality and reliability of the device.
Terms and conditions of commercial sale — Nexperia
products are sold subject to the general terms and conditions of commercial
sale, as published at http://www.nexperia.com/profile/terms, unless otherwise
agreed in a valid written individual agreement. In case an individual
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No offer to sell or license — Nothing i n this document may be interpreted or
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other industrial or inte llectual property rights.
Document status[1][2] Product status[3] Definition
Objective [short] data sheet Development This document contain s data from the objective specification for product development.
Preliminary [short] dat a sheet Qualification This document contains data from the preliminary specification.
Product [short] data sheet Production This document contains the product specification.
© Nexperia B.V. 2017. All rights reserved
74HC21 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 7 — 30 November 2015 13 of 14
Nexperia 74HC21
Dual 4-input AND gate
Export control — This document as well as the item(s) described herein
may be subject to export control regulations. Export might require a prior
authorization from competent authorities.
Non-automotive qualified products — Unless this data sheet expressly
states that this specific Nexperia product is automotive qualified,
the product is not suitable for automo tive use. It i s neither qua lif ied nor test ed
in accordance with automotive testing or application requirements. Nexperia
accepts no liability for inclusion and/or use of
non-automotive qualified products in automotive equipment or applications.
In the event that customer uses the product for design-in and use in
automotive applications to automot ive specifications and standards, custome r
(a) shall use the product without Nexperia’s warranty of the
product for such au tomotive applicat ions, use and specifications, and (b)
whenever customer uses the product for automotive applications beyond
Nexperia’s specifications such use shall be solely at customer’s
own risk, and (c) customer fully indemnifies Nexperia for any
liability, damages or failed product claims resulting from customer design an d
use of the product for automotive applications beyond Nexperia’s
standard warranty and Nexperia’s product specifications.
Translations — A non-English (translated) version of a document is for
reference only. The English version shall prevail in case of any discrepancy
between the translated and English versions.
15.4 Trademarks
Notice: All referenced b rands, produc t names, service names and trademarks
are the property of their respective ow ners.
16. Contact information
For more information, please visit: http://www.nexperia.com
For sales office addresses, please send an email to: salesaddresses@nexperia.com
Nexperia 74HC21
Dual 4-input AND gate
17. Contents
1 General description. . . . . . . . . . . . . . . . . . . . . . 1
2 Features and benefits . . . . . . . . . . . . . . . . . . . . 1
3 Ordering information. . . . . . . . . . . . . . . . . . . . . 1
4 Functional diagram . . . . . . . . . . . . . . . . . . . . . . 2
5 Pinning information. . . . . . . . . . . . . . . . . . . . . . 2
5.1 Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
5.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 3
6 Functional description . . . . . . . . . . . . . . . . . . . 3
7 Limiting values. . . . . . . . . . . . . . . . . . . . . . . . . . 3
8 Recommended operating conditions. . . . . . . . 4
9 Static characteristics. . . . . . . . . . . . . . . . . . . . . 4
10 Dynamic characteristics . . . . . . . . . . . . . . . . . . 5
11 Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
12 Package outline . . . . . . . . . . . . . . . . . . . . . . . . . 8
13 Abbreviations. . . . . . . . . . . . . . . . . . . . . . . . . . 11
14 Revision history. . . . . . . . . . . . . . . . . . . . . . . . 11
15 Legal information. . . . . . . . . . . . . . . . . . . . . . . 12
15.1 Data sheet status . . . . . . . . . . . . . . . . . . . . . . 12
15.2 Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
15.3 Disclaimers. . . . . . . . . . . . . . . . . . . . . . . . . . . 12
15.4 Trademarks. . . . . . . . . . . . . . . . . . . . . . . . . . . 13
16 Contact information. . . . . . . . . . . . . . . . . . . . . 13
17 Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
© Nexperia B.V. 2017. All rights reserved
For more information, please visit: http://www.nexperia.com
For sales office addresses, please send an email to: salesaddresses@nexperia.com
Date of release:
30 November 2015
