DM74AS640N Equivalent & Substitute Parts

Part Overview

The DM74AS640N is an inverting transceiver logic integrated circuit manufactured by onsemi, designed for 8-bit data buffering and signal inversion applications. This device features a single element with 8 bits per element, 3-state output capability, and operates across a 4.5V to 5.5V supply voltage range. The DM74AS640N is classified as obsolete, making identification of compatible substitute components essential for ongoing system maintenance, design updates, and procurement continuity.

Substiute Parts

DM74AS640N

onsemiIn Stock: 1044DM74AS640N Datasheet

Current PartRFQ

SN74AS640N

Texas InstrumentsIn Stock: 2243SN74AS640N Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute components for the DM74AS640N are identified based on strict parametric equivalence across the following critical criteria:

Functional Parameters: Logic type (Transceiver, Inverting), number of elements (1), bits per element (8), and output configuration (3-State) must be identical.

Electrical Parameters: Supply voltage range (4.5V ~ 5.5V), output current specifications (15mA high, 64mA low), and operating temperature range (0°C ~ 70°C) must match exactly.

Physical Parameters: Package type (20-DIP), case dimensions (0.300", 7.62mm), and mounting method (Through Hole) must be identical to ensure mechanical and electrical compatibility in existing PCB layouts.

Series Compatibility: The 74AS logic series designation ensures functional and timing compatibility across substitute components.

Parameter Comparison

Engineering Selection Recommendations

The SN74AS640N manufactured by Texas Instruments is a direct parametric equivalent to the DM74AS640N. Both components share identical functional specifications, electrical characteristics, and physical packaging, enabling direct substitution in applications requiring 74AS series inverting transceiver logic.

The primary distinction between these components is product status: the DM74AS640N is obsolete, while the SN74AS640N maintains active production status. The SN74AS640N additionally carries ROHS3 compliance certification, providing enhanced environmental and regulatory alignment for new designs and long-term procurement strategies.

Selection between these components should be based on availability, supply chain requirements, and regulatory compliance mandates specific to the application environment.

Frequently Asked Questions (FAQ)

Q: Can the SN74AS640N directly replace the DM74AS640N in existing designs?

A: Yes. The SN74AS640N is a parametric equivalent with identical logic type, bit configuration, output characteristics, supply voltage, operating temperature range, and 20-DIP package dimensions. Direct substitution is supported without circuit modification.

Q: Are there differences in electrical performance between these components?

A: No. Both components specify identical output current ratings (15mA high, 64mA low) and supply voltage range (4.5V ~ 5.5V), ensuring equivalent electrical performance in circuit applications.

Q: What is the significance of the product status difference?

A: The DM74AS640N is classified as obsolete, indicating discontinued manufacturing. The SN74AS640N maintains active production status, ensuring long-term availability and supply chain continuity for new procurements and system maintenance.

Q: Does the ROHS3 compliance of the SN74AS640N affect compatibility?

A: ROHS3 compliance indicates adherence to environmental and hazardous substance restrictions. This certification does not affect electrical or functional compatibility; it reflects manufacturing and material standards that may be required for specific regulatory environments.

Q: Are there packaging or mounting differences between these components?

A: No. Both components use identical 20-DIP (0.300", 7.62mm) through-hole packaging, ensuring mechanical compatibility with existing PCB layouts and socket configurations.