DM74ALS161BN Equivalent & Substitute Parts

Part Overview

The DM74ALS161BN is a 4-bit binary counter IC manufactured by onsemi, housed in a 16-DIP package. This component functions as a synchronous counter with asynchronous reset, capable of counting at rates up to 40 MHz. The part is currently classified as obsolete, making equivalent substitutes necessary for ongoing design support and procurement.

Substiute Parts

DM74ALS161BN

onsemiIn Stock: 1421DM74ALS161BN Datasheet

Current PartRFQ

SN74ALS161BN

Texas InstrumentsIn Stock: 2102SN74ALS161BN Datasheet

Parametric EquivalentRFQ

SN74AS161N

Texas InstrumentsIn Stock: 2132SN74AS161N Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DM74ALS161BN is determined by strict equivalence across the following parameters:

• Logic Type: Binary Counter
• Bit Configuration: 4-bit, single element
• Count Direction: Up
• Reset Architecture: Asynchronous
• Timing Mode: Synchronous
• Trigger Mechanism: Positive Edge
• Maximum Count Rate: 40 MHz
• Supply Voltage Range: 4.5 V ~ 5.5 V
• Operating Temperature Range: 0°C ~ 70°C
• Physical Package: 16-DIP (0.300", 7.62mm)
• Mounting Configuration: Through Hole

The identified substitutes maintain full parametric equivalence across all functional and electrical specifications. Differences in manufacturer, product status, and compliance certifications do not affect functional interchangeability.

Parameter Comparison

Engineering Selection Recommendations

The SN74ALS161BN (Texas Instruments) is the primary substitute for the DM74ALS161BN. Both parts share identical series designation (74ALS) and maintain full parametric equivalence. The Texas Instruments variant carries Active product status and ROHS3 compliance, ensuring long-term availability and regulatory alignment.

The SN74AS161N (Texas Instruments) provides an alternative substitute within the 74-series logic family. While classified under the 74AS series rather than 74ALS, it maintains all functional and electrical parameters required for direct substitution. This part also carries Active status and ROHS3 compliance.

Selection between the two Texas Instruments options should be based on procurement availability and supply chain requirements, as both deliver equivalent performance in the DM74ALS161BN application.

Frequently Asked Questions (FAQ)

Q: Can the SN74ALS161BN directly replace the DM74ALS161BN?

A: Yes. The SN74ALS161BN maintains identical functional specifications, electrical parameters, and physical packaging. Direct substitution is supported without circuit modification.

Q: What is the difference between the 74ALS and 74AS series variants?

A: Both series are TTL-compatible logic families. The 74ALS and 74AS variants provided maintain equivalent count rates, voltage specifications, and operating temperature ranges. Series designation reflects internal logic family implementation but does not affect functional interchangeability for this counter application.

Q: Are there any compliance or regulatory differences between the substitutes?

A: The DM74ALS161BN is classified as obsolete. Both Texas Instruments substitutes carry Active product status and ROHS3 compliance, providing regulatory alignment for new designs and ongoing production.

Q: Does the 16-DIP package remain consistent across all variants?

A: Yes. All three parts utilize the 16-DIP (0.300", 7.62mm) through-hole package, ensuring mechanical and electrical compatibility on existing PCB layouts.

Q: Are there inventory considerations for these substitutes?

A: The SN74ALS161BN and SN74AS161N are both available in active inventory from Texas Instruments, with stock levels exceeding 2000 units. The original DM74ALS161BN remains available in limited quantities (1409 units) as new original stock.