SN74LVC08ADG4 Equivalent & Substitute Parts

Part Overview

The SN74LVC08ADG4 is a 4-channel 2-input AND gate logic integrated circuit manufactured by Texas Instruments in 14-SOIC surface mount packaging. This part is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives. The device operates across a supply voltage range of 1.65V to 3.6V with low quiescent current consumption of 1 µA maximum and propagation delay of 3.9ns at 3.3V with 50pF load. Equivalent substitute parts maintain the same logic function, pin configuration, and electrical performance characteristics within specified operating parameters.

Key Parameters

Parameter	Value	Unit
Logic Type	AND Gate	—
Number of Circuits	4	Channels
Number of Inputs	2	Per Circuit
Voltage - Supply	1.65V ~ 3.6V	V
Current - Quiescent (Max)	1	µA
Current - Output High, Low	24mA, 24mA	mA
Max Propagation Delay @ 3.3V, 50pF	3.9	ns
Operating Temperature	-40°C ~ 125°C	°C
Mounting Type	Surface Mount	—
Package / Case	14-SOIC (0.154", 3.90mm Width)	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution eligibility for the SN74LVC08ADG4 is determined by the following critical parameters:

Functional Requirements:

Logic Type: AND Gate (4 channels, 2 inputs per channel)
Pin Configuration: 14-SOIC package footprint compatibility

Electrical Compatibility:

Supply Voltage Range: Must encompass or overlap with 1.65V ~ 3.6V
Output Drive Current: 24mA minimum for both high and low states
Propagation Delay: Maximum 3.9ns at 3.3V with 50pF load

Environmental & Compliance:

Operating Temperature: -40°C ~ 125°C minimum
RoHS3 Compliance required
MSL rating of 1 (Unlimited) preferred

Substitute parts are grouped into two categories based on voltage supply range and quiescent current specifications:

Category A (Direct Substitutes - Identical Supply Range):

SN74LVC08AD (Texas Instruments)
74LVC08AD,118 (Nexperia USA Inc.)
74LVC08AS14-13 (Diodes Incorporated)

Category B (Compatible Substitutes - Reduced Supply Range):

74LCX08M (Fairchild Semiconductor)
MC74LCX08DG (onsemi)
MC74LCX08DR2G (onsemi)

Parameter Comparison

Part Number	Manufacturer	Voltage - Supply (V)	Current - Quiescent Max (µA)	Output Current (mA)	Propagation Delay @ 3.3V, 50pF (ns)	Operating Temp (°C)	Package	Product Status
SN74LVC08ADG4	Texas Instruments	1.65 ~ 3.6	1	24, 24	3.9	-40 ~ 125	14-SOIC	Discontinued
SN74LVC08AD	Texas Instruments	1.65 ~ 3.6	1	24, 24	3.9	-40 ~ 125	14-SOIC	Active
74LVC08AD,118	Nexperia USA Inc.	1.2 ~ 3.6	40	24, 24	4.1	-40 ~ 125	14-SOIC	Active
74LVC08AS14-13	Diodes Incorporated	1.65 ~ 5.5	10	24, 24	3.9	-40 ~ 125	14-SOIC	Active
74LCX08M	Fairchild Semiconductor	2.0 ~ 3.6	10	24, 24	5.5	-40 ~ 85	14-SOIC	Active
MC74LCX08DG	onsemi	2.0 ~ 3.6	10	24, 24	5.5	-40 ~ 85	14-SOIC	Active
MC74LCX08DR2G	onsemi	2.0 ~ 3.6	10	24, 24	5.5	-40 ~ 85	14-SOIC	Active

Engineering Selection Recommendations

Primary Recommendation: SN74LVC08AD (Texas Instruments)

The SN74LVC08AD is the direct functional equivalent of the discontinued SN74LVC08ADG4. Both parts share identical electrical specifications including supply voltage range (1.65V ~ 3.6V), quiescent current (1 µA maximum), output drive current (24mA), and propagation delay (3.9ns at 3.3V, 50pF). The SN74LVC08AD maintains active product status with 1900 pieces in stock. Both parts are ROHS3 compliant with MSL rating of 1 (Unlimited). Packaging is 14-SOIC surface mount. This substitution requires no circuit redesign or performance verification.

Secondary Recommendation: 74LVC08AS14-13 (Diodes Incorporated)

The 74LVC08AS14-13 provides identical logic function and electrical performance (3.9ns propagation delay) with extended supply voltage range (1.65V ~ 5.5V). This part is active with 2158 pieces in stock and maintains ROHS3 compliance. The extended voltage range provides additional design flexibility for applications requiring higher supply voltages. Operating temperature range matches the original part (-40°C ~ 125°C). Packaging is 14-SOIC surface mount.

Alternative Recommendation: 74LVC08AD,118 (Nexperia USA Inc.)

The 74LVC08AD,118 offers the widest supply voltage range (1.2V ~ 3.6V) among available substitutes, enabling operation in ultra-low voltage applications. This part is active with 20953 pieces in stock and maintains ROHS3 compliance. Operating temperature range matches the original part (-40°C ~ 125°C). Propagation delay is 4.1ns at 3.3V with 50pF load, representing a 5% increase from the original specification. Quiescent current is 40 µA maximum, higher than the original 1 µA. Packaging is 14-SOIC surface mount.

Compatibility Note for 74LCX Series (74LCX08M, MC74LCX08DG, MC74LCX08DR2G):

The 74LCX series parts (Fairchild Semiconductor and onsemi) operate within reduced supply voltage range (2.0V ~ 3.6V), excluding operation below 2.0V. These parts exhibit higher propagation delay (5.5ns at 3.3V, 50pF) and reduced operating temperature range (-40°C ~ 85°C). These parts are suitable only for applications where minimum supply voltage is 2.0V or higher and maximum operating temperature does not exceed 85°C.

Frequently Asked Questions (FAQ)

Q1: Can SN74LVC08AD directly replace SN74LVC08ADG4 without circuit modification?

Yes. The SN74LVC08AD is a direct functional equivalent with identical electrical specifications, pin configuration, and 14-SOIC package. No circuit redesign is required. Both parts operate at 1.65V ~ 3.6V supply voltage with 1 µA quiescent current and 3.9ns propagation delay at 3.3V with 50pF load.

Q2: What is the key difference between 74LVC and 74LCX series parts?

The 74LVC series operates at supply voltages from 1.65V (or lower), while 74LCX series requires minimum 2.0V supply voltage. The 74LCX series also exhibits higher propagation delay (5.5ns versus 3.9ns) and reduced operating temperature range (-40°C ~ 85°C versus -40°C ~ 125°C). Select 74LVC series for low-voltage or extended temperature applications.

Q3: Is the 74LVC08AS14-13 suitable for 5V applications?

Yes. The 74LVC08AS14-13 supports supply voltage range of 1.65V ~ 5.5V, making it compatible with 5V system designs. The original SN74LVC08ADG4 is limited to 3.6V maximum. This extended range provides design flexibility for mixed-voltage systems.

Q4: What is the impact of higher quiescent current in substitute parts?

The original SN74LVC08ADG4 specifies 1 µA maximum quiescent current. The 74LVC08AD,118 specifies 40 µA maximum, and 74LVC08AS14-13 specifies 10 µA maximum. Higher quiescent current increases standby power consumption. For battery-powered or ultra-low-power applications, select parts with lower quiescent current specifications.

Q5: Can 74LCX08M be used in applications requiring -40°C ~ 125°C operating temperature?

No. The 74LCX08M operates only within -40°C ~ 85°C temperature range. Applications requiring operation above 85°C must use 74LVC series parts, which support -40°C ~ 125°C. Verify application temperature requirements before selecting 74LCX series substitutes.

Q6: Are all substitute parts ROHS3 compliant?

All recommended substitute parts are ROHS3 compliant. Compliance certifications are provided in the parameter comparison table. Verify specific compliance requirements for your application or regulatory jurisdiction.

Q7: What packaging options are available for these substitutes?

All substitute parts are available in 14-SOIC surface mount package with 0.154" (3.90mm) width. Packaging variants include Tube, Bulk, and Tape & Reel (TR) options. Verify packaging format availability with your supplier for production requirements.

Q8: Is propagation delay difference between 3.9ns and 5.5ns significant?

The 1.6ns difference represents a 41% increase in propagation delay. For timing-critical applications operating at high frequencies, this difference may be significant. Verify timing margins in your circuit design before selecting 74LCX series parts with 5.5ns propagation delay.

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