SN74ALS869NT Equivalent & Substitute Parts

Part Overview

The SN74ALS869NT is an 8-bit binary counter IC manufactured by Texas Instruments, housed in a 24-pin DIP package for through-hole mounting. This device functions as a synchronous binary counter with up/down counting capability, operating at a maximum count rate of 35 MHz with a supply voltage range of 4.5 V to 5.5 V. The part is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and production continuity.

Substiute Parts

SN74ALS869NT

Texas InstrumentsIn Stock: 2308SN74ALS869NT Datasheet

Current PartRFQ

SN74ALS869DW

Texas InstrumentsIn Stock: 993SN74ALS869DW Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The SN74ALS869DW qualifies as a direct functional substitute for the SN74ALS869NT based on the following criteria:

Matching Electrical Parameters:

• Identical logic type (Binary Counter)
• Identical bit width (8 Bit)
• Identical counting direction (Up, Down)
• Identical count rate (35 MHz)
• Identical trigger type (Positive Edge)
• Identical reset configuration (Synchronous)
• Identical timing architecture (Synchronous)
• Identical supply voltage range (4.5 V ~ 5.5 V)
• Identical operating temperature range (0°C ~ 70°C)

Mechanical Difference: The primary distinction between these parts is the package format: the SN74ALS869NT uses a 24-pin DIP (0.300", 7.62mm) through-hole package, while the SN74ALS869DW uses a 24-pin SOIC (0.295", 7.50mm) surface-mount package. Both packages contain the same die and pin configuration, making them electrically interchangeable when appropriate PCB layout and assembly methods are employed.

Parameter Comparison

Engineering Selection Recommendations

The SN74ALS869DW is the designated manufacturer substitute for the obsolete SN74ALS869NT. Both parts maintain identical electrical specifications and are manufactured by Texas Instruments under the same 74ALS series designation. The SN74ALS869DW carries active product status, ensuring continued availability and manufacturing support.

Selection between these parts depends on PCB assembly methodology: the SN74ALS869NT is appropriate for through-hole assembly processes, while the SN74ALS869DW is suitable for surface-mount assembly. Both parts satisfy ROHS3 compliance and REACH regulatory requirements, making either suitable for applications requiring environmental compliance certification.

Frequently Asked Questions (FAQ)

Q: Can the SN74ALS869DW replace the SN74ALS869NT in an existing design?

A: Yes, provided the PCB layout and assembly process support surface-mount components. The electrical functionality is identical. Through-hole designs require PCB redesign to accommodate the SOIC package footprint.

Q: What is the primary reason for substitution?

A: The SN74ALS869NT is classified as obsolete. The SN74ALS869DW is the active equivalent from the same manufacturer, ensuring long-term availability and production continuity.

Q: Are there any electrical performance differences between these parts?

A: No. Both parts share identical electrical specifications including count rate, supply voltage, operating temperature range, and logic functionality.

Q: What are the package dimension differences?

A: The SN74ALS869NT uses a 24-DIP package measuring 0.300" (7.62mm) in width for through-hole mounting. The SN74ALS869DW uses a 24-SOIC package measuring 0.295" (7.50mm) in width for surface-mount assembly.

Q: Do both parts meet the same regulatory standards?

A: Yes. Both parts are ROHS3 compliant, REACH unaffected, and carry identical moisture sensitivity levels (MSL 1 - Unlimited).