DM74LS259N Equivalent & Substitute Parts

Part Overview

The DM74LS259N is an 8-bit addressable latch IC manufactured by onsemi, designed for digital logic applications requiring addressable storage and output control. This component features D-type addressable logic with a 1:8 circuit configuration and standard output type. The DM74LS259N is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The SN74LS259BN from Texas Instruments serves as a direct functional equivalent with active product status and improved compliance certifications.

Substiute Parts

DM74LS259N

onsemiIn Stock: 1647DM74LS259N Datasheet

Current PartRFQ

SN74LS259BN

Texas InstrumentsIn Stock: 2704SN74LS259BN Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the DM74LS259N is determined by the following critical parameters:

• Logic type and circuit configuration (D-Type, Addressable 1:8)
• Voltage supply range (4.75V ~ 5.25V)
• Output type (Standard)
• Package and mounting specifications (16-DIP through hole)
• Current output ratings (400µA high, 8mA low)
• Operating temperature range (0°C ~ 70°C)

The SN74LS259BN meets all these substitution criteria. Both parts share identical functional specifications, electrical ratings, and physical packaging. The primary distinction lies in product status and compliance certifications, with the SN74LS259BN offering active availability and enhanced RoHS compliance.

Parameter Comparison

Engineering Selection Recommendations

The SN74LS259BN is the appropriate substitute for the DM74LS259N based on the following factors:

Functional equivalence is established through identical logic type, circuit configuration, output type, voltage supply range, current ratings, operating temperature range, and package specifications. Both components are pin-compatible 16-DIP through-hole devices with matching electrical performance within the specified parameters.

Product status favors the SN74LS259BN, which maintains active manufacturing status from Texas Instruments, ensuring long-term availability and supply chain reliability. The DM74LS259N is classified as obsolete, limiting future procurement options.

Compliance certifications provide additional justification for substitution. The SN74LS259BN achieves ROHS3 compliance, meeting current regulatory requirements for electronic component manufacturing and distribution. The DM74LS259N is RoHS non-compliant, presenting potential restrictions in regulated markets and applications.

The SN74LS259BN demonstrates improved propagation delay performance at 19ns compared to the DM74LS259N at 35ns, providing enhanced timing characteristics while maintaining full backward compatibility.

Frequently Asked Questions (FAQ)

Q: Are the DM74LS259N and SN74LS259BN pin-compatible?

A: Yes. Both components use the 16-DIP package with identical pin assignments and electrical specifications. Direct socket substitution is possible without circuit modifications.

Q: What are the key differences between these parts?

A: The primary differences are product status, RoHS compliance, and propagation delay. The SN74LS259BN is actively manufactured, ROHS3 compliant, and offers faster propagation delay (19ns vs. 35ns). All functional and electrical parameters remain identical.

Q: Can the SN74LS259BN replace the DM74LS259N in existing designs?

A: Yes. The SN74LS259BN is a direct functional equivalent meeting all electrical and mechanical requirements of the DM74LS259N. No design changes are required.

Q: What is the voltage supply requirement for both parts?

A: Both the DM74LS259N and SN74LS259BN require a supply voltage range of 4.75V to 5.25V for proper operation.

Q: Are there any packaging differences?

A: No. Both parts are supplied in 16-DIP (0.300", 7.62mm) through-hole packages. The DM74LS259N is available in standard packaging, while the SN74LS259BN is supplied in tube packaging.

Q: What is the operating temperature range for these components?

A: Both parts operate within the temperature range of 0°C to 70°C.

Q: Why is the DM74LS259N classified as obsolete?

A: Obsolete status indicates that onsemi has discontinued manufacturing and support for this component. The SN74LS259BN from Texas Instruments provides continued availability and support for this logic function.