DM74ALS161BMX Equivalent & Substitute Parts

Part Overview

The DM74ALS161BMX is a 4-bit binary counter IC manufactured by onsemi, designed for synchronous counting applications with a maximum count rate of 40 MHz. This component features asynchronous reset capability and positive edge triggering, housed in a 16-SOIC surface mount package. The part is currently classified as obsolete, making identification of equivalent and substitute components essential for ongoing design support and production continuity.

Substiute Parts

DM74ALS161BMX

onsemiIn Stock: 1053DM74ALS161BMX Datasheet

Current PartRFQ

SN74ALS161BD

Texas InstrumentsIn Stock: 1374SN74ALS161BD Datasheet

DirectRFQ

SN74ALS161BNSR

Texas InstrumentsIn Stock: 3415SN74ALS161BNSR Datasheet

SimilarRFQ

SN74ALS161BDR

Texas InstrumentsIn Stock: 2623SN74ALS161BDR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the DM74ALS161BMX are classified based on strict parameter alignment within the 74ALS logic family. All identified substitutes maintain identical functional specifications: 4-bit binary counter architecture, 40 MHz count rate, asynchronous reset, positive edge triggering, and 4.5 V to 5.5 V supply voltage operation across the 0°C to 70°C temperature range.

Substitution eligibility is determined by the following critical parameters:

• Logic Type: Binary Counter (1 Element, 4 Bit)
• Timing: Synchronous with Asynchronous Reset
• Count Rate: 40 MHz minimum
• Trigger Type: Positive Edge
• Supply Voltage: 4.5 V ~ 5.5 V
• Package compatibility: 16-SOIC or 16-SO form factors

Differences in packaging format (tube vs. tape & reel), product status, and manufacturer do not affect functional equivalence when these core parameters are maintained.

Parameter Comparison

Engineering Selection Recommendations

For applications currently using the DM74ALS161BMX, the following substitution path is recommended based on product lifecycle status and regulatory compliance:

Primary Selection: SN74ALS161BDR (Texas Instruments) This part maintains full functional and pin compatibility with identical package dimensions (16-SOIC, 0.154" width). The SN74ALS161BDR carries Active product status with ROHS3 compliance, ensuring long-term availability and regulatory alignment for new designs and production continuity.

Secondary Selection: SN74ALS161BD (Texas Instruments) Functionally equivalent with identical package specifications. This part is classified as Last Time Buy, indicating limited future availability. Selection is appropriate for near-term production requirements where inventory can be secured.

Alternative Selection: SN74ALS161BNSR (Texas Instruments) Maintains all functional parameters with Active product status and ROHS3 compliance. Package width differs (0.209" vs. 0.154"), requiring PCB layout verification for mechanical fit. This option provides extended availability for applications where package footprint adjustment is feasible.

All three substitutes are qualified equivalents within the 74ALS logic family and require no circuit redesign when functional parameters are the controlling specification.

Frequently Asked Questions (FAQ)

Q: Can SN74ALS161BDR be used as a direct replacement for DM74ALS161BMX? A: Yes. Both parts are 4-bit binary counters with identical electrical specifications (40 MHz count rate, 4.5 V to 5.5 V supply, asynchronous reset, positive edge triggering) and package dimensions (16-SOIC, 0.154" width). Pin configuration and functional behavior are equivalent.

Q: What is the difference between SN74ALS161BD and SN74ALS161BDR? A: Both parts are functionally and electrically identical. The primary difference is packaging format: SN74ALS161BD is supplied in tube packaging, while SN74ALS161BDR is supplied in tape & reel format. SN74ALS161BDR carries Active product status compared to Last Time Buy for SN74ALS161BD.

Q: Why does SN74ALS161BNSR have a different package width? A: SN74ALS161BNSR uses a 16-SO package with 0.209" width compared to the standard 16-SOIC 0.154" width. Both are surface mount packages with identical pin counts and electrical specifications. PCB layout verification is required to confirm mechanical compatibility before substitution.

Q: Are there any temperature or voltage derating considerations when substituting these parts? A: No. All substitute parts operate within the same temperature range (0°C to 70°C) and supply voltage range (4.5 V to 5.5 V) as the original DM74ALS161BMX. No circuit modifications are required.

Q: What is the significance of ROHS3 compliance on the Texas Instruments substitutes? A: ROHS3 compliance indicates conformance to Restriction of Hazardous Substances regulations. The Texas Instruments parts (SN74ALS161BD, SN74ALS161BDR, SN74ALS161BNSR) all carry ROHS3 certification, supporting regulatory requirements for new product designs and manufacturing in restricted markets.

Q: Can I mix different substitute parts in the same production run? A: Yes. All three Texas Instruments substitutes are functionally equivalent and can be used interchangeably in the same circuit. Packaging format differences (tube vs. tape & reel) and package width variations do not affect electrical performance or pin compatibility.