DM74ALS175SJ Equivalent & Substitute Parts

Part Overview

The DM74ALS175SJ is a flip-flop logic integrated circuit featuring a single D-type element with 4-bit configuration and complementary outputs. Manufactured by onsemi in a 16-SOIC package, this component operates at a maximum clock frequency of 50 MHz with a propagation delay of 17ns at 5V with 50pF load. The part is currently classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements.

Substiute Parts

DM74ALS175SJ

onsemiIn Stock: 1032DM74ALS175SJ Datasheet

Current PartRFQ

SN74ALS175NSR

Texas InstrumentsIn Stock: 4710SN74ALS175NSR Datasheet

DirectRFQ

SN74ALS175D

Texas InstrumentsIn Stock: 2772SN74ALS175D Datasheet

SimilarRFQ

SN74ALS175DR

Texas InstrumentsIn Stock: 6208SN74ALS175DR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the DM74ALS175SJ are qualified based on the following critical parameters that must remain identical:

• Base product number (74ALS175)
• Function (Master Reset)
• Type (D-Type Flip Flop)
• Number of Elements (1)
• Number of Bits per Element (4)
• Output Type (Complementary)
• Clock Frequency (50 MHz)
• Max Propagation Delay (17ns @ 5V, 50pF)
• Trigger Type (Positive Edge)
• Voltage Supply Range (4.5V ~ 5.5V)
• Current ratings (Output High/Low: 400µA, 8mA; Quiescent: 14 mA)
• Operating Temperature (0°C ~ 70°C)
• Mounting Type (Surface Mount)

Substitute parts are grouped into two categories based on package dimensions:

Group 1 (Direct Substitutes): SN74ALS175NSR maintains identical 16-SOIC package dimensions (0.209", 5.30mm Width) as the original DM74ALS175SJ.

Group 2 (Similar Substitutes): SN74ALS175D and SN74ALS175DR feature 16-SOIC packaging with different dimensions (0.154", 3.90mm Width), requiring PCB layout verification before implementation.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: SN74ALS175NSR (Texas Instruments)

The SN74ALS175NSR is the optimal substitute for the obsolete DM74ALS175SJ. This part maintains identical package dimensions (16-SOIC 0.209", 5.30mm Width), ensuring direct PCB compatibility without layout modifications. The SN74ALS175NSR carries Active product status with ROHS3 compliance, providing long-term availability and regulatory alignment for new production designs.

Secondary Recommendation: SN74ALS175DR (Texas Instruments)

The SN74ALS175DR offers an alternative with Active product status and ROHS3 compliance. However, this part features different package dimensions (16-SOIC 0.154", 3.90mm Width) compared to the original DM74ALS175SJ. PCB layout verification is required before implementation to confirm pad spacing and footprint compatibility.

Alternative Consideration: SN74ALS175D (Texas Instruments)

The SN74ALS175D is classified as Last Time Buy, indicating limited future availability. While electrically equivalent and ROHS3 compliant, this part should be considered only when SN74ALS175NSR and SN74ALS175DR are unavailable. Like SN74ALS175DR, it requires PCB layout verification due to different package dimensions (16-SOIC 0.154", 3.90mm Width).

Frequently Asked Questions (FAQ)

Q: Can SN74ALS175NSR be used as a direct replacement for DM74ALS175SJ without PCB modifications?

A: Yes. The SN74ALS175NSR maintains identical 16-SOIC package dimensions (0.209", 5.30mm Width) as the DM74ALS175SJ, allowing direct substitution without PCB layout changes.

Q: What is the difference between SN74ALS175NSR and SN74ALS175DR?

A: Both parts are electrically equivalent with identical functional parameters. The primary difference is package dimensions: SN74ALS175NSR uses 16-SOIC (0.209", 5.30mm Width), while SN74ALS175DR uses 16-SOIC (0.154", 3.90mm Width). SN74ALS175NSR is recommended for direct replacement of the original DM74ALS175SJ.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All Texas Instruments substitute parts (SN74ALS175NSR, SN74ALS175D, and SN74ALS175DR) are ROHS3 compliant, meeting current environmental and regulatory requirements.

Q: What does "Last Time Buy" status mean for SN74ALS175D?

A: Last Time Buy indicates that the manufacturer has announced end-of-life for this part. While currently available, future availability is limited. SN74ALS175NSR or SN74ALS175DR should be prioritized for new designs.

Q: Are there any electrical performance differences between the substitute parts?

A: No. All substitute parts maintain identical electrical specifications including clock frequency (50 MHz), propagation delay (17ns @ 5V, 50pF), supply voltage range (4.5V ~ 5.5V), and output current ratings (400µA, 8mA).

Q: Can SN74ALS175D or SN74ALS175DR be used if PCB layout cannot be modified?

A: No. Both parts feature different package dimensions (16-SOIC 0.154", 3.90mm Width) compared to the original DM74ALS175SJ (16-SOIC 0.209", 5.30mm Width). PCB layout modifications are required for these substitutes.

Q: What is the moisture sensitivity level for all parts?

A: All parts, including the original DM74ALS175SJ and all substitutes, have Moisture Sensitivity Level (MSL) 1 (Unlimited), indicating no moisture sensitivity restrictions during storage and handling.