SN74ALS259DRE4 Equivalent & Substitute Parts

Part Overview

The SN74ALS259DRE4 is an 8-bit addressable latch IC manufactured by Texas Instruments, classified as a D-Type, Addressable logic component with a 1:8 circuit configuration. This device is packaged in a 16-SOIC surface mount package and operates within a 4.5V to 5.5V supply voltage range. The part is currently discontinued at DiGi Electronics, making identification of equivalent substitute parts essential for ongoing design support and procurement.

Substiute Parts

SN74ALS259DRE4

Texas InstrumentsIn Stock: 1041SN74ALS259DRE4 Datasheet

Current PartRFQ

SN74ALS259DR

Texas InstrumentsIn Stock: 1053SN74ALS259DR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74ALS259DRE4 is determined by strict equivalence across the following critical parameters:

• Logic Type and Circuit Configuration (D-Type, Addressable 1:8)
• Output Type (Standard)
• Supply Voltage Range (4.5V ~ 5.5V)
• Propagation Delay (2ns)
• Output Current Specifications (400µA, 8mA)
• Operating Temperature Range (0°C ~ 70°C)
• Package Type (16-SOIC surface mount)
• Compliance Standards (ROHS3, REACH Unaffected)

The SN74ALS259DR qualifies as a direct substitute based on identical electrical characteristics and package specifications. The primary distinction is packaging format: the SN74ALS259DRE4 is supplied in tube packaging, while the SN74ALS259DR is supplied in Tape & Reel (TR) format.

Parameter Comparison

Engineering Selection Recommendations

The SN74ALS259DR is the manufacturer-recommended substitute for the discontinued SN74ALS259DRE4. Both parts are manufactured by Texas Instruments and maintain identical electrical and functional specifications. The SN74ALS259DR carries Active product status, ensuring continued availability and supply chain support.

Both parts meet ROHS3 compliance requirements and carry REACH Unaffected status, satisfying regulatory requirements for industrial and commercial applications. The MSL rating of 1 (Unlimited) indicates minimal moisture sensitivity, reducing handling and storage constraints.

The substitution is electrically and mechanically transparent. The only operational difference is packaging format: Tape & Reel (TR) for the SN74ALS259DR versus tube packaging for the SN74ALS259DRE4. This distinction affects procurement and assembly processes but does not impact device performance or functionality.

Frequently Asked Questions (FAQ)

Q: Can the SN74ALS259DR directly replace the SN74ALS259DRE4 in existing designs?

A: Yes. Both parts are electrically and functionally identical. They share the same logic type, circuit configuration, supply voltage, propagation delay, output current specifications, operating temperature range, and 16-SOIC package dimensions. Direct substitution requires no circuit modifications.

Q: What is the difference between the SN74ALS259DRE4 and SN74ALS259DR?

A: The parts are functionally equivalent. The primary difference is packaging format: the SN74ALS259DRE4 is supplied in tube packaging, while the SN74ALS259DR is supplied in Tape & Reel (TR) format. This affects procurement and automated assembly processes but not device performance.

Q: Why is the SN74ALS259DRE4 discontinued?

A: The SN74ALS259DRE4 is discontinued at DiGi Electronics. The functionally equivalent SN74ALS259DR remains in active production and is the recommended alternative for new procurement.

Q: Are there any compliance or regulatory differences between these parts?

A: No. Both parts are ROHS3 compliant and carry REACH Unaffected status. Both have an MSL rating of 1 (Unlimited), indicating identical moisture sensitivity characteristics.

Q: What are the critical parameters for substitution?

A: Substitution is valid when the following parameters match: Logic Type (D-Type, Addressable), Circuit Configuration (1:8), Output Type (Standard), Supply Voltage (4.5V ~ 5.5V), Propagation Delay (2ns), Output Current (400µA, 8mA), Operating Temperature (0°C ~ 70°C), and Package Type (16-SOIC surface mount).