74HCT153DB,112 Equivalent & Substitute Parts

Part Overview

The 74HCT153DB,112 is a dual 4:1 multiplexer logic integrated circuit manufactured by Nexperia USA Inc. in a 16-SSOP surface mount package. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity. The 74HCT series operates from a single 4.5V to 5.5V supply and is designed for applications requiring multiplexing of multiple input signals to a single output line.

Substiute Parts

74HCT153DB,112

Nexperia USA Inc.In Stock: 112074HCT153DB,112 Datasheet

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SN74HC253DBR

Texas InstrumentsIn Stock: 4092SN74HC253DBR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74HCT153DB,112 is determined by the following critical parameters:

• Circuit Configuration: Both main and substitute parts must implement a 2 x 4:1 multiplexer topology with identical pin functionality
• Package Type: 16-SSOP surface mount package with 0.209" width (5.30mm) ensures mechanical and electrical compatibility with existing PCB layouts
• Supply Voltage Compatibility: The substitute must operate within or encompass the 4.5V to 5.5V supply range of the original part
• Output Current Capability: Minimum output current specifications must meet or exceed the 4mA requirement
• Temperature Range: Operating temperature specifications must cover the -40°C to 125°C range or be suitable for the intended application environment
• Compliance Standards: RoHS3 compliance and MSL rating ensure regulatory and manufacturing process compatibility

The SN74HC253DBR from Texas Instruments meets these substitution criteria as an active product with identical circuit configuration and package specifications.

Parameter Comparison

Engineering Selection Recommendations

The SN74HC253DBR is a direct functional substitute for the obsolete 74HCT153DB,112 based on the following engineering criteria:

• Identical Circuit Topology: Both parts implement a 2 x 4:1 multiplexer with the same pin configuration and functional behavior
• Package Compatibility: The 16-SSOP package dimensions are identical, allowing direct PCB layout compatibility without redesign
• Supply Voltage: The SN74HC253DBR operates across a wider voltage range (2V to 6V) that fully encompasses the original 4.5V to 5.5V specification
• Output Drive Capability: The substitute provides 7.8mA output current, exceeding the original 4mA specification and ensuring adequate drive capability for downstream logic
• Regulatory Compliance: Both parts are ROHS3 compliant with MSL 1 rating, maintaining manufacturing process compatibility and environmental standards
• Active Production Status: The SN74HC253DBR is in active production, ensuring long-term availability and supply chain stability

The primary design consideration is the operating temperature range. The substitute supports -40°C to 85°C, which is narrower than the original -40°C to 125°C range. Applications requiring operation above 85°C must evaluate alternative solutions or confirm that the substitute's temperature range is acceptable for the intended use case.

Frequently Asked Questions (FAQ)

Q: Can the SN74HC253DBR be used as a direct replacement for the 74HCT153DB,112 without PCB modifications?

A: Yes. Both parts use the 16-SSOP package with identical pin assignments and circuit configuration. No PCB layout changes are required for mechanical or electrical compatibility.

Q: What is the difference between the 74HCT and 74HC series designations?

A: The 74HCT series is designed for TTL-level input compatibility (4.5V to 5.5V supply), while the 74HC series operates across a broader voltage range (2V to 6V). The SN74HC253DBR maintains functional compatibility with the original part when operated within the 4.5V to 5.5V range.

Q: Does the higher output current of the SN74HC253DBR (7.8mA vs. 4mA) affect circuit operation?

A: No. Higher output current capability is a beneficial characteristic that provides greater drive strength for downstream logic without introducing compatibility issues. The substitute can source or sink more current than the original part, which is advantageous for signal integrity.

Q: Is the narrower operating temperature range of the SN74HC253DBR (-40°C to 85°C vs. -40°C to 125°C) a concern?

A: This depends on the application environment. If the circuit operates within the -40°C to 85°C range, the substitute is fully compatible. Applications requiring operation above 85°C must confirm that alternative solutions are available or that the narrower range is acceptable for the specific use case.

Q: Are both parts RoHS3 compliant?

A: Yes. Both the 74HCT153DB,112 and SN74HC253DBR are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with modern manufacturing processes and environmental regulations.

Q: What is the availability status of these parts?

A: The 74HCT153DB,112 is obsolete and no longer in production. The SN74HC253DBR is an active product with current manufacturing availability, making it the recommended choice for new designs and production continuity.