SN74AS869NT Equivalent & Substitute Parts

Part Overview

The SN74AS869NT is an 8-bit binary counter IC manufactured by Texas Instruments in the 74AS logic family. This component functions as a synchronous counter with up/down capability, designed for positive edge triggering at a maximum count rate of 45 MHz. The part is packaged in a 24-pin DIP (Dual In-line Package) configuration for through-hole mounting.

The SN74AS869NT is classified as obsolete. Locating equivalent or substitute parts is necessary for legacy system maintenance, board redesigns, or when original inventory becomes unavailable. Substitutes must maintain functional equivalence while accommodating packaging and mounting differences in modern designs.

Substiute Parts

SN74AS869NT

Texas InstrumentsIn Stock: 4025SN74AS869NT Datasheet

Current PartRFQ

SN74AS869DW

Texas InstrumentsIn Stock: 938SN74AS869DW Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74AS869NT is determined by the following critical parameters:

• Logic Function: Binary counter with 8-bit capacity, up/down counting direction, and synchronous reset
• Electrical Characteristics: 45 MHz count rate, 4.5 V to 5.5 V supply voltage, positive edge triggering
• Timing Behavior: Synchronous operation with single element configuration
• Operating Conditions: 0°C to 70°C temperature range

The SN74AS869DW is identified as a manufacturer-recommended substitute. Both parts share identical electrical specifications, logic function, and operational parameters. The primary difference is packaging: the SN74AS869NT uses through-hole 24-DIP mounting, while the SN74AS869DW uses surface-mount 24-SOIC packaging. This distinction affects board layout and assembly methodology but does not alter functional equivalence.

Parameter Comparison

Engineering Selection Recommendations

The SN74AS869DW is functionally equivalent to the SN74AS869NT. Both parts maintain identical electrical performance, logic operation, and compliance certifications (ROHS3 Compliant, REACH Unaffected). Selection between these parts depends on board assembly requirements:

• SN74AS869NT (24-DIP): Select for through-hole assembly or legacy board designs requiring DIP packaging
• SN74AS869DW (24-SOIC): Select for surface-mount assembly or modern PCB designs utilizing SMD components

Both parts carry obsolete status. Inventory availability should be confirmed with component distributors prior to design commitment. Compliance requirements (RoHS3, REACH) are satisfied by both options.

Frequently Asked Questions (FAQ)

Q: Can the SN74AS869DW replace the SN74AS869NT in an existing design?

A: Electrical and functional replacement is complete. Pin configuration and logic operation are identical. Physical mounting differs: the SN74AS869NT requires through-hole sockets, while the SN74AS869DW requires surface-mount pads. PCB redesign is necessary if switching between these package types.

Q: Are there performance differences between the SN74AS869NT and SN74AS869DW?

A: No. Both parts operate at 45 MHz count rate, accept 4.5 V to 5.5 V supply voltage, and provide identical 8-bit up/down counter functionality with synchronous reset and positive edge triggering.

Q: What is the significance of the 24-DIP versus 24-SOIC package designation?

A: Package designation indicates physical form factor and mounting method. 24-DIP (Dual In-line Package) is a through-hole component with 0.300" lead spacing. 24-SOIC (Small Outline Integrated Circuit) is a surface-mount component with 0.295" body width. Electrical performance is identical; assembly process differs.

Q: Are both parts RoHS compliant?

A: Yes. Both the SN74AS869NT and SN74AS869DW are ROHS3 Compliant and REACH Unaffected, meeting current environmental and regulatory standards.

Q: Why is the SN74AS869NT classified as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The part remains functional and available through existing inventory channels, but new production is not available. Substitute parts should be evaluated for long-term supply chain planning.