SN74LS122DRE4 Equivalent & Substitute Parts

Part Overview

The SN74LS122DRE4 is a monostable multivibrator logic IC manufactured by Texas Instruments, designed for timing and pulse generation applications. It features a 28 ns propagation delay and operates within the 4.75 V to 5.25 V supply voltage range. The device is packaged in a 14-SOIC surface mount configuration.

This part is discontinued at DiGi Electronics, making identification of equivalent substitute parts essential for ongoing production and maintenance applications. Substitute parts must maintain identical electrical characteristics and package specifications to ensure direct compatibility in existing circuit designs.

Substiute Parts

SN74LS122DRE4

Texas InstrumentsIn Stock: 855SN74LS122DRE4 Datasheet

Current PartRFQ

SN74LS122DR

Texas InstrumentsIn Stock: 35689SN74LS122DR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SN74LS122DRE4 are identified based on the following critical parameters that determine functional and physical compatibility:

• Logic Type: Monostable multivibrator function
• Propagation Delay: 28 ns timing specification
• Supply Voltage Range: 4.75 V ~ 5.25 V
• Output Current Characteristics: 400µA (high), 8mA (low)
• Package Configuration: 14-SOIC surface mount
• Operating Temperature Range: 0°C ~ 70°C
• Series Classification: 74LS logic family

The SN74LS122DR qualifies as a direct substitute based on matching all electrical parameters and package specifications. The primary distinction is packaging format (Tape & Reel versus individual unit packaging) and product status (Active versus Discontinued).

Parameter Comparison

Engineering Selection Recommendations

The SN74LS122DR is the appropriate substitute for the discontinued SN74LS122DRE4. Both parts are manufactured by Texas Instruments and maintain identical electrical specifications, timing characteristics, and physical package dimensions. The substitute part is currently in active production status with substantial inventory availability (35,629 units), ensuring supply chain continuity.

Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for current manufacturing standards. The MSL rating of 1 (Unlimited) indicates no moisture sensitivity constraints for either part.

The primary operational difference is packaging format: the SN74LS122DR is supplied in Tape & Reel format, which is standard for high-volume production environments. This packaging format does not affect the electrical or functional characteristics of the component.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS122DR directly replace the SN74LS122DRE4 in existing circuit designs?

A: Yes. Both parts share identical electrical specifications, timing parameters, supply voltage requirements, output current ratings, and 14-SOIC package dimensions. Direct substitution is supported without circuit modification.

Q: What is the difference between SN74LS122DRE4 and SN74LS122DR?

A: The parts are electrically and functionally identical. The primary difference is packaging format: SN74LS122DRE4 is supplied as individual units, while SN74LS122DR is supplied in Tape & Reel format for automated assembly. The SN74LS122DR is currently in active production, whereas the SN74LS122DRE4 is discontinued.

Q: Are there any compatibility concerns with the 14-SOIC package?

A: No. Both parts use the identical 14-SOIC package with 0.154" (3.90mm) width. PCB footprints, solder pad layouts, and component placement are fully compatible.

Q: Do both parts meet current regulatory compliance standards?

A: Yes. Both the SN74LS122DRE4 and SN74LS122DR are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What is the MSL rating, and does it affect handling?

A: Both parts have an MSL rating of 1 (Unlimited), indicating no moisture sensitivity constraints. Standard handling procedures are sufficient without special moisture control measures.

Q: Is the 28 ns propagation delay specification identical between both parts?

A: Yes. Both parts specify 28 ns propagation delay, ensuring timing-critical applications maintain identical performance characteristics.