SN74AS869DW Equivalent & Substitute Parts

Part Overview

The SN74AS869DW is an 8-bit binary counter IC manufactured by Texas Instruments in the 74AS logic series. This component functions as a synchronous counter with positive edge triggering, capable of counting up or down at rates up to 45 MHz. The device is classified as obsolete, making identification of suitable alternatives essential for new designs and production continuity. The 24-SOIC surface mount package and 4.5V to 5.5V supply voltage range define its operational envelope. Due to its obsolete status, equivalent or substitute parts must be evaluated based on functional capability, electrical compatibility, and package availability.

Key Parameters

Parameter	Value
Manufacturer Part Number	SN74AS869DW
Manufacturer	Texas Instruments
Logic Type	Binary Counter
Number of Bits per Element	8 Bit
Direction	Up, Down
Count Rate	45 MHz
Voltage - Supply	4.5 V ~ 5.5 V
Operating Temperature	0°C ~ 70°C
Package / Case	24-SOIC (0.295", 7.50mm Width)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the SN74AS869DW is constrained by the following critical parameters:

Logic Function: Binary counter with synchronous operation and positive edge triggering
Bit Width: 8-bit counting capability
Count Direction: Bidirectional (up/down counting)
Supply Voltage Compatibility: 4.5V to 5.5V operation
Synchronous Reset: Required for timing-critical applications
Package Type: Surface mount configuration

The SN74LV163APWR is identified as a manufacturer-recommended substitute. However, this part exhibits functional differences that must be evaluated:

Bit Width Reduction: 4-bit counter versus 8-bit original
Direction Limitation: Up-counting only, versus bidirectional capability
Enhanced Speed: 90 MHz count rate versus 45 MHz original
Expanded Supply Range: 2V to 5.5V versus 4.5V to 5.5V original
Extended Temperature Range: -40°C to 85°C versus 0°C to 70°C original
Package Change: 16-TSSOP versus 24-SOIC original

Parameter Comparison

Parameter	SN74AS869DW (Original)	SN74LV163APWR (Substitute)
Manufacturer	Texas Instruments	Texas Instruments
Logic Type	Binary Counter	Binary Counter
Number of Bits per Element	8 Bit	4 Bit
Direction	Up, Down	Up
Reset	Synchronous	Synchronous
Timing	Synchronous	Synchronous
Count Rate	45 MHz	90 MHz
Trigger Type	Positive Edge	Positive Edge
Voltage - Supply	4.5 V ~ 5.5 V	2 V ~ 5.5 V
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount
Package / Case	24-SOIC (0.295", 7.50mm Width)	16-TSSOP (0.173", 4.40mm Width)
Product Status	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

The SN74LV163APWR is an active product with current manufacturing support and full RoHS3 compliance, addressing the obsolescence risk of the SN74AS869DW. Both devices employ synchronous architecture with positive edge triggering and are manufactured by Texas Instruments.

Selection of the SN74LV163APWR requires evaluation of application-specific requirements:

Functional Compatibility Assessment: The substitute operates as a 4-bit counter with up-counting capability only. Applications requiring 8-bit counting width or bidirectional (up/down) counting cannot use this substitute without circuit redesign. Multiple SN74LV163APWR devices may be cascaded to achieve 8-bit functionality, but this introduces additional component count and PCB area.

Electrical Compatibility: The SN74LV163APWR operates across 2V to 5.5V, encompassing the original 4.5V to 5.5V range. The 90 MHz count rate exceeds the original 45 MHz specification, providing timing margin. Extended operating temperature range (-40°C to 85°C) accommodates broader environmental conditions than the original (0°C to 70°C).

Package Consideration: The 16-TSSOP package is smaller than the 24-SOIC original, reducing PCB footprint. Pin-to-pin compatibility does not exist; circuit board redesign is required.

Compliance Status: Both devices maintain ROHS3 compliance and EAR99 export classification, ensuring regulatory continuity.

Frequently Asked Questions (FAQ)

Q: Can the SN74LV163APWR directly replace the SN74AS869DW without circuit modification?

A: No. The SN74LV163APWR is a 4-bit counter versus the 8-bit original, and supports up-counting only versus bidirectional counting. Pin assignments differ between the 24-SOIC and 16-TSSOP packages. Circuit redesign is required for substitution.

Q: What is the functional difference between the 8-bit SN74AS869DW and the 4-bit SN74LV163APWR?

A: The SN74AS869DW counts from 0 to 255 (8-bit range) in both up and down directions. The SN74LV163APWR counts from 0 to 15 (4-bit range) in the up direction only. For applications requiring 8-bit counting, two SN74LV163APWR devices can be cascaded, but this increases component complexity.

Q: Are there supply voltage compatibility concerns when using the SN74LV163APWR?

A: The SN74LV163APWR operates from 2V to 5.5V, which fully encompasses the original 4.5V to 5.5V range. No voltage compatibility issues exist for systems operating within the original specification.

Q: Does the higher count rate of the SN74LV163APWR (90 MHz versus 45 MHz) create any issues?

A: No. The higher count rate provides additional timing margin and does not create compatibility issues. Applications designed for 45 MHz operation will function correctly with the 90 MHz device.

Q: What package considerations apply to the SN74LV163APWR?

A: The SN74LV163APWR uses a 16-TSSOP package (0.173" width) versus the original 24-SOIC package (0.295" width). The smaller package reduces PCB footprint but requires new PCB layout and routing. Pin assignments are not compatible; direct socket substitution is not possible.

Q: Are both devices RoHS compliant?

A: Yes. Both the SN74AS869DW and SN74LV163APWR are ROHS3 compliant, ensuring regulatory alignment for new designs and production.

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