DM7405N Equivalent & Substitute Parts

Part Overview

The DM7405N is a 6-channel inverter logic IC with open collector output configuration, manufactured by onsemi in a 14-pin DIP package. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing production and maintenance applications. The DM7405N operates within the standard 7400 logic series family and is suitable for applications requiring inverting logic functions with open collector outputs in through-hole mounting configurations.

Substiute Parts

DM7405N

onsemiIn Stock: 1994DM7405N Datasheet

Current PartRFQ

SN7405N

Texas InstrumentsIn Stock: 5622SN7405N Datasheet

DirectRFQ

SN74ALS05AN

Texas InstrumentsIn Stock: 2029SN74ALS05AN Datasheet

SimilarRFQ

SN74ALS1005NSR

Texas InstrumentsIn Stock: 1931SN74ALS1005NSR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the DM7405N is determined by strict equivalence in the following core parameters: logic type (inverter), circuit count (6 channels), input count (1 per channel), and open collector output configuration. All substitute parts must maintain identical input logic levels (0.8V low, 2V high) and compatible supply voltage ranges. Package compatibility is evaluated separately based on mounting requirements.

The substitute parts are grouped into two categories:

Direct Equivalent (Pin and Functional Compatible): SN7405N maintains identical electrical specifications, supply voltage range (4.75V ~ 5.25V), output current (16mA), propagation delay (55ns @ 5V, 15pF), and through-hole 14-DIP packaging. This part is a direct replacement.

Functional Equivalent with Parameter Variations: SN74ALS05AN and SN74ALS1005NSR provide the same logic function and open collector configuration but operate within an expanded supply voltage range (4.5V ~ 5.5V) and feature different output current and propagation delay characteristics. SN74ALS1005NSR uses surface mount packaging (14-SO) rather than through-hole.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement: SN7405N is the primary substitute for DM7405N. This part maintains identical electrical specifications, supply voltage range, output current, and propagation delay characteristics. Both components use through-hole 14-DIP packaging, enabling direct board-level substitution without circuit modification. SN7405N carries active product status and ROHS3 compliance, addressing the obsolescence and regulatory limitations of the original DM7405N.

For Expanded Voltage Range Applications: SN74ALS05AN provides functional equivalence with an expanded supply voltage operating range (4.5V ~ 5.5V) compared to the DM7405N (4.75V ~ 5.25V). This part features reduced output current (8mA versus 16mA) and maintains through-hole 14-DIP packaging. Selection of this part requires verification that the reduced output current meets circuit load requirements.

For Surface Mount Implementations: SN74ALS1005NSR provides functional equivalence in a surface mount 14-SOIC package. This part operates within the expanded voltage range (4.5V ~ 5.5V) and features increased output current (24mA) with improved propagation delay (30ns @ 5V, 50pF). This option is suitable only for new designs or board redesigns incorporating surface mount technology.

Frequently Asked Questions (FAQ)

Q: Can SN7405N be used as a direct replacement for DM7405N without circuit modifications?

A: Yes. SN7405N maintains identical electrical specifications including supply voltage range (4.75V ~ 5.25V), output current (16mA), propagation delay (55ns @ 5V, 15pF), and through-hole 14-DIP packaging. Direct board-level substitution is possible without circuit design changes.

Q: What are the key differences between SN74ALS05AN and DM7405N?

A: SN74ALS05AN operates within an expanded supply voltage range (4.5V ~ 5.5V) and features reduced output current (8mA versus 16mA). Propagation delay is comparable (54ns @ 5V, 50pF). Both use through-hole 14-DIP packaging. Circuit load requirements must be evaluated to confirm compatibility with the reduced output current specification.

Q: Why would SN74ALS1005NSR be selected over SN7405N?

A: SN74ALS1005NSR is selected only when surface mount packaging is required for new designs or board redesigns. This part features improved propagation delay (30ns @ 5V, 50pF) and increased output current (24mA). It is not suitable for through-hole board retrofits of the original DM7405N.

Q: Are all substitute parts RoHS compliant?

A: SN7405N, SN74ALS05AN, and SN74ALS1005NSR are all ROHS3 compliant. The original DM7405N is RoHS non-compliant. Regulatory requirements may necessitate substitution with compliant alternatives.

Q: What is the impact of different output current ratings on circuit compatibility?

A: Output current determines the maximum load-driving capability. SN74ALS05AN (8mA) has reduced capability compared to DM7405N and SN7405N (16mA), while SN74ALS1005NSR (24mA) has increased capability. Circuit load impedance and fan-out requirements must be evaluated to ensure the selected part can drive the intended load.

Q: Can these parts be used interchangeably in existing designs?

A: SN7405N is fully interchangeable with DM7405N. SN74ALS05AN requires load verification due to reduced output current. SN74ALS1005NSR requires board redesign due to different packaging (surface mount versus through-hole).