74VHC244M Equivalent & Substitute Parts

Part Overview

The 74VHC244M is a non-inverting buffer IC manufactured by onsemi, featuring 2 elements with 4 bits per element and 3-state output capability. This component is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design support and procurement.

The 74VHC244M operates across a supply voltage range of 2V to 5.5V with output current capability of 8mA for both high and low states. The device is housed in a 20-SOIC package and is ROHS3 compliant with MSL rating of 1 (Unlimited).

Substiute Parts

74VHC244M

onsemiIn Stock: 112674VHC244M Datasheet

Current PartRFQ

MC74VHC244DWR2G

onsemiIn Stock: 2090MC74VHC244DWR2G Datasheet

UpgradeRFQ

SN74AHC244DW

Texas InstrumentsIn Stock: 2061SN74AHC244DW Datasheet

DirectRFQ

SN74AHC244DWR

Texas InstrumentsIn Stock: 4060SN74AHC244DWR Datasheet

DirectRFQ

74AHC244D,118

NXP USA Inc.In Stock: 301274AHC244D,118 Datasheet

UpgradeRFQ

SN74AHC244NSR

Texas InstrumentsIn Stock: 8058SN74AHC244NSR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74VHC244M is determined by the following critical parameters:

• Logic Type: Buffer, Non-Inverting
• Number of Elements: 2
• Number of Bits per Element: 4
• Output Type: 3-State
• Current - Output High, Low: 8mA, 8mA
• Voltage - Supply: 2V ~ 5.5V
• Package / Case: 20-SOIC (0.295", 7.50mm Width)
• Mounting Type: Surface Mount

Substitute parts are grouped into three categories based on their relationship to the main part:

Upgrade Substitutes: Parts with enhanced specifications (extended temperature range, active product status) that maintain full electrical and mechanical compatibility.

Direct Substitutes: Parts with identical electrical specifications and package dimensions, differing primarily in product status or packaging format.

Similar Substitutes: Parts with compatible electrical specifications but minor package dimension variations (different SOIC width) that may require board layout verification.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation - MC74VHC244DWR2G (onsemi): This upgrade substitute maintains the same manufacturer lineage as the original 74VHC244M while offering active product status and extended operating temperature range (-55°C to 125°C). The part is ROHS3 compliant and available in high volume. The MSL rating of 3 (168 Hours) is suitable for standard manufacturing environments.

Secondary Recommendation - SN74AHC244DWR (Texas Instruments): This direct substitute provides active product status with identical electrical specifications and package dimensions. The part maintains MSL rating of 1 (Unlimited) and is available in Cut Tape & Digi-Reel packaging format with 4044 units in stock.

Alternative Option - 74AHC244D,118 (NXP USA Inc.): This upgrade substitute from NXP (Nexperia) offers active product status and extended temperature range. The part is available in bulk packaging with 2962 units in stock and maintains full electrical compatibility.

Package Consideration - SN74AHC244NSR (Texas Instruments): This similar substitute features a narrower SOIC package (5.30mm width versus 7.50mm). While electrically compatible, board layout verification is required to confirm mechanical fit within existing PCB footprints.

Frequently Asked Questions (FAQ)

Q: Can the 74VHC244M be directly replaced with MC74VHC244DWR2G?

A: Yes. Both parts share identical logic type, element count, bit configuration, output type, current ratings, and supply voltage specifications. The MC74VHC244DWR2G offers extended temperature range and active product status. The package dimensions are identical (20-SOIC, 7.50mm width).

Q: What is the difference between SN74AHC244DW and SN74AHC244DWR?

A: Both parts are manufactured by Texas Instruments with identical electrical specifications. The primary difference is packaging format: SN74AHC244DW is supplied in Tube packaging, while SN74AHC244DWR is supplied in Cut Tape & Digi-Reel format. SN74AHC244DWR has higher inventory availability (4044 units versus 2000 units).

Q: Why is SN74AHC244NSR listed as a similar substitute rather than a direct substitute?

A: The SN74AHC244NSR features a narrower SOIC package (5.30mm width) compared to the standard 7.50mm width of the 74VHC244M. While electrically compatible, the different package width requires verification that the component footprint fits within existing PCB designs.

Q: Are all substitute parts ROHS3 compliant?

A: The 74VHC244M, MC74VHC244DWR2G, SN74AHC244DW, SN74AHC244DWR, and SN74AHC244NSR are all ROHS3 compliant. The 74AHC244D,118 does not specify RoHS status in the provided data.

Q: What is the significance of MSL rating differences?

A: The 74VHC244M and SN74AHC244DWR both carry MSL rating of 1 (Unlimited), indicating no moisture sensitivity restrictions. The MC74VHC244DWR2G carries MSL rating of 3 (168 Hours), requiring storage in controlled humidity environments and baking procedures if moisture absorption limits are exceeded during manufacturing.

Q: Which substitute offers the best long-term availability?

A: MC74VHC244DWR2G (onsemi) and SN74AHC244DWR (Texas Instruments) both carry active product status, indicating ongoing manufacturer support. The MC74VHC244DWR2G offers the advantage of remaining within the onsemi product family, maintaining design continuity with the original 74VHC244M.