SN74HC20DBR Equivalent & Substitute Parts

Part Overview

The SN74HC20DBR is a dual 4-input NAND gate logic IC manufactured by Texas Instruments in 14-SSOP surface mount packaging. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and production continuity. The 74HC20 logic family provides standard NAND gate functionality suitable for digital logic applications requiring low-power CMOS operation across industrial temperature ranges.

Substiute Parts

SN74HC20DBR

Texas InstrumentsIn Stock: 1056SN74HC20DBR Datasheet

Current PartRFQ

74HC20PW,118

NXP USA Inc.In Stock: 5360374HC20PW,118 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74HC20DBR is based on the following critical parameters that must remain consistent:

• Logic Function: Dual 4-input NAND gate (2 circuits, 4 inputs per circuit)
• Supply Voltage Range: 2V ~ 6V compatibility
• Mounting Technology: Surface mount configuration
• Base Product Series: 74HC logic family
• Electrical Performance: Quiescent current, output drive capability, and propagation delay characteristics

The 74HC20PW,118 from NXP USA Inc. maintains functional equivalence through identical logic configuration, supply voltage range, and electrical specifications. Package differences (14-TSSOP vs. 14-SSOP) represent physical form factor variations within the same footprint class, both suitable for surface mount assembly.

Parameter Comparison

Engineering Selection Recommendations

The 74HC20PW,118 from NXP USA Inc. is the primary substitute for the obsolete SN74HC20DBR. Selection is justified on the following engineering criteria:

Functional Equivalence: Both parts implement identical dual 4-input NAND gate logic with matching electrical specifications for supply voltage, quiescent current, and output drive characteristics.

Active Product Status: The NXP part maintains active production status, ensuring long-term availability and supply chain continuity compared to the obsolete Texas Instruments variant.

Enhanced Operating Range: The NXP substitute supports extended operating temperature range (-40°C ~ 125°C) compared to the original part (-40°C ~ 85°C), providing broader application flexibility.

Improved Propagation Delay: The 74HC20PW,118 delivers faster propagation delay (15ns vs. 19ns at 6V, 50pF), meeting or exceeding timing requirements for existing designs.

Compliance Alignment: Both parts share identical ECCN (EAR99) and HTSUS classifications, maintaining regulatory consistency in procurement and export documentation.

Package Compatibility: The 14-TSSOP package maintains pinout and footprint compatibility with 14-SSOP designs, supporting direct board-level substitution with standard surface mount assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the 74HC20PW,118 directly replace the SN74HC20DBR in existing designs?

A: Yes. Both parts implement dual 4-input NAND gate logic with identical pin configurations, electrical specifications, and supply voltage requirements. The 14-TSSOP package is footprint-compatible with 14-SSOP designs for surface mount assembly.

Q: What are the key differences between these parts?

A: The primary differences are manufacturer (Texas Instruments vs. NXP), product status (obsolete vs. active), operating temperature range (-40°C to 85°C vs. -40°C to 125°C), and propagation delay (19ns vs. 15ns). All functional and electrical parameters remain equivalent.

Q: Why is the NXP part faster in propagation delay?

A: The 15ns propagation delay for the 74HC20PW,118 represents improved manufacturing process technology compared to the original Texas Instruments design. This performance enhancement is transparent to designs meeting the original 19ns specification.

Q: Are there any package considerations for substitution?

A: Both parts use surface mount technology with 14-pin configurations. The 14-TSSOP package (4.40mm width) is slightly narrower than 14-SSOP (5.30mm width) but maintains identical pinout and footprint compatibility for standard PCB assembly.

Q: What compliance certifications apply to the substitute part?

A: The 74HC20PW,118 maintains ROHS3 compliance and shares identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications with the original part, ensuring regulatory consistency.

Q: Is the extended temperature range of the NXP part beneficial?

A: The extended operating range (-40°C to 125°C vs. -40°C to 85°C) provides additional design margin for applications requiring higher temperature operation, though existing designs specified for -40°C to 85°C remain fully compatible.