SN74AS163NSR Equivalent & Substitute Parts

Part Overview

The SN74AS163NSR is a 4-bit binary counter IC manufactured by Texas Instruments, designed for synchronous counting applications with a maximum count rate of 40 MHz. This component features positive edge triggering, synchronous reset, and operates across a supply voltage range of 4.5 V to 5.5 V with an operating temperature range of 0°C to 70°C. The part is classified as obsolete, making identification of active equivalent and substitute parts essential for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Logic Type	Binary Counter
Number of Bits per Element	4
Direction	Up
Reset Type	Synchronous
Timing	Synchronous
Count Rate	40 MHz
Trigger Type	Positive Edge
Voltage - Supply	4.5 V ~ 5.5 V
Operating Temperature	0°C ~ 70°C
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the SN74AS163NSR is determined by strict equivalence across the following critical parameters:

Logic Type: Binary Counter
Number of Bits per Element: 4
Direction: Up
Reset Type: Synchronous
Timing: Synchronous
Count Rate: 40 MHz
Trigger Type: Positive Edge
Voltage - Supply: 4.5 V ~ 5.5 V
Operating Temperature: 0°C ~ 70°C
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

The identified substitutes maintain full parametric equivalence across all functional and electrical specifications. Differences exist only in product status (active vs. obsolete) and packaging configuration (tape & reel vs. tube).

Parameter Comparison

Parameter	SN74AS163NSR	SN74ALS163BNSR	SN74AS163D
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments
Series	74AS	74ALS	74AS
Logic Type	Binary Counter	Binary Counter	Binary Counter
Number of Bits per Element	4	4	4
Direction	Up	Up	Up
Reset Type	Synchronous	Synchronous	Synchronous
Timing	Synchronous	Synchronous	Synchronous
Count Rate	40 MHz	40 MHz	40 MHz
Trigger Type	Positive Edge	Positive Edge	Positive Edge
Voltage - Supply	4.5 V ~ 5.5 V	4.5 V ~ 5.5 V	4.5 V ~ 5.5 V
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	16-SOIC (0.209", 5.30mm Width)	16-SOIC (0.209", 5.30mm Width)	16-SOIC (0.154", 3.90mm Width)
Packaging	Tape & Reel (TR)	Tape & Reel (TR)	Tube
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

SN74ALS163BNSR is a parametric equivalent substitute with active product status. This part maintains identical electrical and functional specifications while offering improved long-term availability. The 74ALS series designation indicates advanced low-power Schottky logic technology, providing equivalent performance to the 74AS series within the specified operating parameters. Both parts are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements.

SN74AS163D is a manufacturer-recommended substitute within the same 74AS series. This part maintains full parametric equivalence and active product status. The primary distinction is the package width specification (0.154" vs. 0.209"), which may affect PCB layout considerations. Packaging format differs (tube vs. tape & reel), influencing procurement and assembly processes.

Selection between SN74ALS163BNSR and SN74AS163D should be based on packaging requirements, supply chain availability, and PCB layout constraints. Both parts satisfy all functional and electrical requirements for direct substitution.

Frequently Asked Questions (FAQ)

Q: Can SN74ALS163BNSR replace SN74AS163NSR in existing designs?

A: Yes. The SN74ALS163BNSR maintains identical electrical specifications, count rate, supply voltage range, operating temperature range, and functional behavior. The 74ALS series is fully compatible with 74AS series applications within the specified parameters.

Q: What is the difference between the package widths listed for SN74AS163D?

A: SN74AS163D uses a 16-SOIC package with 0.154" width, compared to the 0.209" width of the original part. This represents a different SOIC variant and may require PCB layout verification to ensure footprint compatibility.

Q: Are all three parts ROHS3 compliant?

A: Yes. SN74AS163NSR, SN74ALS163BNSR, and SN74AS163D are all ROHS3 compliant with MSL rating of 1 (Unlimited), meeting current environmental and regulatory standards.

Q: What is the significance of product status (Obsolete vs. Active)?

A: The SN74AS163NSR is classified as obsolete, indicating discontinued manufacturing. SN74ALS163BNSR and SN74AS163D are active products with ongoing production and supply availability, making them suitable for new designs and long-term procurement.

Q: Does packaging format affect electrical performance?

A: No. Tape & Reel (TR) and Tube packaging formats do not affect electrical performance or functional specifications. The difference is operational, affecting assembly processes and procurement logistics.

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