DM7438N NAND Gate IC Equivalent & Substitute Parts

Part Overview

The DM7438N is a 4-channel 2-input NAND gate IC manufactured by onsemi, housed in a 14-pin DIP package. This logic gate operates as an open collector device within the 7400 series logic family. The DM7438N is classified as obsolete, making identification of functionally equivalent active alternatives essential for new designs and production continuity.

Substiute Parts

DM7438N

onsemiIn Stock: 1940DM7438N Datasheet

Current PartRFQ

SN7438N

Texas InstrumentsIn Stock: 4564SN7438N Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DM7438N is determined by strict equivalence across the following critical parameters:

• Logic Function: NAND gate with 4 channels, 2 inputs per channel
• Output Configuration: Open collector topology
• Electrical Specifications: Supply voltage 4.75V–5.25V, output current 48mA (low), input thresholds 0.8V (low) and 2V (high), propagation delay 22ns @ 5V with 45pF load
• Package Compatibility: 14-pin DIP form factor (0.300", 7.62mm pitch) with through-hole mounting
• Series Classification: 7400 logic family

The SN7438N manufactured by Texas Instruments meets all substitution criteria. Both devices share identical functional specifications, electrical parameters, and physical packaging, enabling direct pin-for-pin replacement.

Parameter Comparison

Engineering Selection Recommendations

The SN7438N is the direct equivalent substitute for the DM7438N. Selection is based on the following factors:

Product Status: The DM7438N is obsolete, while the SN7438N maintains active production status, ensuring long-term availability and supply chain reliability.

Compliance & Certifications: The SN7438N is RoHS3 compliant and carries REACH Unaffected status, meeting modern regulatory requirements. Both devices share identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications.

Functional Equivalence: All electrical parameters, logic specifications, and physical packaging are identical between the two devices, enabling direct substitution without circuit modification.

Inventory Availability: The SN7438N is available in higher quantities (4550 pcs) compared to the DM7438N (1842 pcs), supporting production requirements.

Frequently Asked Questions (FAQ)

Q: Can the SN7438N replace the DM7438N in existing designs?

A: Yes. The SN7438N is a direct pin-for-pin equivalent. All electrical parameters, logic function, and package dimensions are identical. No circuit modifications are required.

Q: Are there differences in packaging between these devices?

A: Both devices use 14-pin DIP packaging with 0.300" (7.62mm) pitch. The DM7438N is supplied in standard packaging, while the SN7438N is available in tube packaging. Both are through-hole mount components compatible with the same PCB footprints.

Q: What is the significance of the DM7438N being obsolete?

A: Obsolete status indicates the manufacturer (onsemi) has discontinued production. The SN7438N, maintained in active production by Texas Instruments, provides continuity for applications requiring this logic function.

Q: Are there compliance differences between the two parts?

A: The SN7438N is RoHS3 compliant, while the DM7438N does not carry this certification. Both are REACH Unaffected. For applications requiring RoHS compliance, the SN7438N is the appropriate selection.

Q: What are the critical substitution parameters for this device?

A: Substitution is valid when the following parameters match: 4-channel NAND gate configuration, 2 inputs per channel, open collector output, 4.75V–5.25V supply voltage, 48mA output current, 22ns propagation delay @ 5V with 45pF load, and 14-pin DIP package with 0.300" pitch.