DM74ALS540AN Equivalent & Substitute Parts

Part Overview

The DM74ALS540AN is an inverting buffer logic integrated circuit manufactured by onsemi, designed for 5.5V operation with 3-state output capability. This 20-pin DIP package device functions as a 1-element, 8-bit buffer with inverting logic configuration. The part is classified as obsolete, making equivalent substitute components necessary for ongoing design support and procurement continuity.

Substiute Parts

DM74ALS540AN

onsemiIn Stock: 2396DM74ALS540AN Datasheet

Current PartRFQ

SN74ALS540-1N

Texas InstrumentsIn Stock: 2255SN74ALS540-1N Datasheet

SimilarRFQ

SN74ALS540N

Texas InstrumentsIn Stock: 3900SN74ALS540N Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the DM74ALS540AN are qualified based on the following critical parameters:

• Logic Configuration: Buffer, Inverting topology with identical 1-element, 8-bit architecture
• Electrical Specifications: Voltage supply range 4.5V ~ 5.5V and operating temperature 0°C ~ 70°C
• Package Compatibility: 20-DIP (0.300", 7.62mm) through-hole mounting
• Output Characteristics: 3-state output capability
• Current Ratings: Output current specifications within acceptable operational limits

Two substitute parts meet these criteria: SN74ALS540-1N (Texas Instruments) and SN74ALS540N (Texas Instruments). Both maintain identical logic functionality, package form factor, and core electrical parameters required for direct substitution.

Parameter Comparison

Engineering Selection Recommendations

SN74ALS540N is the primary equivalent substitute for the DM74ALS540AN. This Texas Instruments part maintains identical output current specifications (15mA high, 24mA low) and all critical electrical parameters. The part is active in production status with ROHS3 compliance certification, ensuring long-term availability and regulatory alignment.

SN74ALS540-1N serves as an alternative substitute with the same logic configuration and package compatibility. This variant features increased output low current capability (48mA versus 24mA), which provides additional drive capability for applications requiring higher sink current. This part is also active in production with ROHS3 compliance.

Both substitutes are manufactured by Texas Instruments and share the 74ALS base product number, confirming parametric equivalence to the obsolete onsemi DM74ALS540AN.

Frequently Asked Questions (FAQ)

Q: Can SN74ALS540N directly replace DM74ALS540AN in existing designs?

A: Yes. Both parts share identical logic configuration (inverting buffer, 1 element, 8-bit), output type (3-state), voltage supply range (4.5V ~ 5.5V), operating temperature (0°C ~ 70°C), and package form factor (20-DIP through-hole). Output current specifications are identical (15mA high, 24mA low).

Q: What is the difference between SN74ALS540-1N and SN74ALS540N?

A: Both parts are functionally equivalent for the DM74ALS540AN substitution. The primary difference is output low current: SN74ALS540-1N provides 48mA while SN74ALS540N provides 24mA. Select SN74ALS540-1N if your application requires higher sink current capability.

Q: Are the substitute parts available in the same packaging?

A: Yes. Both SN74ALS540-1N and SN74ALS540N are supplied in 20-DIP (0.300", 7.62mm) through-hole packages, identical to the original DM74ALS540AN.

Q: Why is the original DM74ALS540AN marked as obsolete?

A: The DM74ALS540AN is classified as obsolete by onsemi. Texas Instruments maintains active production of equivalent 74ALS540 variants, making the SN74ALS540N and SN74ALS540-1N the recommended long-term solutions for new designs and ongoing procurement.

Q: Do the substitute parts meet current regulatory requirements?

A: Yes. Both SN74ALS540-1N and SN74ALS540N are ROHS3 compliant, meeting current environmental and regulatory standards for electronic components.