SN74LS221DRE4 Equivalent & Substitute Parts Reference

Part Overview

The SN74LS221DRE4 is a monostable multivibrator logic IC manufactured by Texas Instruments, belonging to the 74LS series. It features two independent circuits within a 16-SOIC package, with a propagation delay of 45 ns, and operates in the 4.75 V to 5.25 V supply voltage range. The device is surface mount and ROHS3 compliant. The SN74LS221DRE4 is currently discontinued at Digi-Key, necessitating identification of alternative model numbers for continued design support and replacement in existing applications.

Substiute Parts

SN74LS221DRE4

Texas InstrumentsIn Stock: 919SN74LS221DRE4 Datasheet

Current PartRFQ

SN74LS221DR

Texas InstrumentsIn Stock: 5140SN74LS221DR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution is based strictly on matching category, logic type, electrical and mechanical specifications, and compliance attributes. The substitute part SN74LS221DR is grouped as an equivalent due to alignment in the following key parameters:

• Manufacturer: Texas Instruments
• Series: 74LS
• Logic Type: Monostable
• Number of Circuits: 2
• Supply Voltage Range: 4.75 V ~ 5.25 V
• Propagation Delay: 45 ns
• Package Type: 16-SOIC, Surface Mount
• ROHS and REACH Compliance
• MSL: 1 (Unlimited)

No assumptions or unlisted parameters are considered in the substitution grouping.

Parameter Comparison

Engineering Selection Recommendations

Selection of SN74LS221DR as an equivalent or substitute for SN74LS221DRE4 is technically valid because all key electrical and mechanical parameters are identical. Both parts comply with ROHS3 and REACH requirements, MSL 1 rating, and supply chain criteria. No deviation in certification status or base part number is present. The substitution is supported for maintaining part compliance and ensuring continued availability due to the discontinued status of SN74LS221DRE4.

Frequently Asked Questions (FAQ)

Q1: What are the primary selection factors for substituting SN74LS221DRE4?
A1: Selection is determined by matching manufacturer, series, logic type, key electrical parameters (voltage range, propagation delay, output current), package type, mounting method, and compliance attributes.

Q2: Is the package specification for SN74LS221DR identical to SN74LS221DRE4?
A2: Yes; both are surface mount devices in 16-SOIC (0.154", 3.90mm width) packages.

Q3: Are there any differences in RoHS or REACH compliance between the two parts?
A3: No; both SN74LS221DRE4 and its substitute SN74LS221DR are ROHS3 compliant and REACH unaffected.

Q4: Do substitute parts have the same logic functionality and independent circuit count?
A4: Yes; both provide monostable multivibrator logic with two independent circuits.

Q5: Can users substitute SN74LS221DRE4 with SN74LS221DR without altering the board design?
A5: Yes; matching package, pinout, and all supplied parameters enable direct substitution within existing designs.

Q6: Does product status affect substitution choice?
A6: Yes; SN74LS221DRE4 is discontinued, making SN74LS221DR an appropriate substitute based on availability and identical key parameters.