SN74LS221NG4 Equivalent & Substitute Parts

Part Overview

The SN74LS221NG4 is a monostable multivibrator logic IC manufactured by Texas Instruments, featuring dual independent circuits with 45 ns propagation delay in a 16-DIP through-hole package. This part is discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing production and maintenance applications. The part operates within the 4.75 V to 5.25 V supply voltage range and is rated for 0°C to 70°C operating temperature.

Substiute Parts

SN74LS221NG4

Texas InstrumentsIn Stock: 1060SN74LS221NG4 Datasheet

Current PartRFQ

SN74LS221N

Texas InstrumentsIn Stock: 2179SN74LS221N Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74LS221NG4 is based on strict equivalence across the following critical parameters:

• Logic Type: Monostable Multivibrator
• Independent Circuits: 2
• Propagation Delay: 45 ns
• Current - Output High, Low: 400µA, 8mA
• Voltage - Supply: 4.75 V ~ 5.25 V
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 16-DIP (0.300", 7.62mm)
• Mounting Type: Through Hole
• Series: 74LS
• RoHS Status: ROHS3 Compliant

The SN74LS221N qualifies as a direct substitute, maintaining identical electrical specifications and package configuration while differing only in packaging format (tube vs. individual) and product status (active vs. discontinued).

Parameter Comparison

Engineering Selection Recommendations

The SN74LS221N is the primary substitute for the discontinued SN74LS221NG4. Both parts are manufactured by Texas Instruments and maintain identical electrical and mechanical specifications. The SN74LS221N carries active product status, ensuring continued availability and supply chain reliability. Both parts meet ROHS3 compliance requirements and are suitable for applications requiring monostable multivibrator functionality in 5V logic systems.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS221N directly replace the SN74LS221NG4 in existing designs?

A: Yes. The SN74LS221N is electrically and mechanically equivalent to the SN74LS221NG4. Both parts feature identical propagation delay (45 ns), output current ratings (400µA high, 8mA low), supply voltage range (4.75 V ~ 5.25 V), operating temperature range (0°C ~ 70°C), and 16-DIP through-hole package configuration. No circuit modifications are required.

Q: What is the difference between SN74LS221NG4 and SN74LS221N?

A: The primary differences are packaging format and product status. The SN74LS221NG4 is supplied in individual packaging and is discontinued at DiGi Electronics. The SN74LS221N is supplied in tube packaging and maintains active product status with higher inventory availability (2124 pcs vs. 1019 pcs).

Q: Are both parts RoHS compliant?

A: Yes. Both the SN74LS221NG4 and SN74LS221N are ROHS3 compliant and REACH unaffected, meeting environmental regulatory requirements for electronic components.

Q: What applications require the 74LS221 monostable multivibrator?

A: The 74LS221 is used in timing circuits, pulse generation, frequency division, and delay applications within 5V TTL logic systems. The dual independent circuits allow two independent monostable functions within a single package.

Q: Can this part be used in new designs?

A: The SN74LS221N is recommended for new designs due to its active product status and assured supply availability. The SN74LS221NG4 is discontinued and should not be specified for new production.