54AC20/SDA-R NAND Gate IC Equivalent & Substitute Parts

Part Overview

The 54AC20/SDA-R is a NAND Gate IC featuring 2 channels with 4 inputs per channel in a 14-CFlatPack surface mount package. This logic component is manufactured by Rochester Electronics, LLC and is classified as obsolete. The part operates across a 2V to 6V supply voltage range with a maximum propagation delay of 8.5ns at 5V with 50pF load. Due to its obsolete product status, identifying parametrically equivalent substitute parts is necessary to maintain design continuity and ensure component availability for production and repair applications.

Key Parameters

Parameter	Value
Logic Type	NAND Gate
Number of Circuits	2
Number of Inputs	4
Voltage - Supply	2V ~ 6V
Current - Quiescent (Max)	40 µA
Current - Output High, Low	24mA, 24mA
Input Logic Level - Low	0.9V ~ 1.65V
Input Logic Level - High	2.1V ~ 3.85V
Max Propagation Delay @ V, Max CL	8.5ns @ 5V, 50pF
Operating Temperature	-55°C ~ 125°C
Package / Case	14-CFlatPack
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution of the 54AC20/SDA-R is determined by strict equivalence across the following critical parameters:

Functional Parameters:

Logic Type: NAND Gate
Number of Circuits: 2 channels
Number of Inputs: 4 inputs per channel

Electrical Parameters:

Voltage - Supply: 2V ~ 6V
Current - Quiescent (Max): 40 µA
Current - Output High, Low: 24mA, 24mA
Input Logic Level - Low: 0.9V ~ 1.65V
Input Logic Level - High: 2.1V ~ 3.85V
Max Propagation Delay @ V, Max CL: 8.5ns @ 5V, 50pF
Operating Temperature: -55°C ~ 125°C

Physical Parameters:

Package / Case: 14-CFlatPack
Mounting Type: Surface Mount

The substitute part JM54AC20SDA-RH meets all specified parameters identically, ensuring direct functional and physical compatibility.

Parameter Comparison

Parameter	54AC20/SDA-R (Rochester Electronics)	JM54AC20SDA-RH (National Semiconductor)
Manufacturer Part Number	54AC20/SDA-R	JM54AC20SDA-RH
Manufacturer	Rochester Electronics, LLC	National Semiconductor
Product Status	Obsolete	Active
Logic Type	NAND Gate	NAND Gate
Number of Circuits	2	2
Number of Inputs	4	4
Voltage - Supply	2V ~ 6V	2V ~ 6V
Current - Quiescent (Max)	40 µA	40 µA
Current - Output High, Low	24mA, 24mA	24mA, 24mA
Input Logic Level - Low	0.9V ~ 1.65V	0.9V ~ 1.65V
Input Logic Level - High	2.1V ~ 3.85V	2.1V ~ 3.85V
Max Propagation Delay @ V, Max CL	8.5ns @ 5V, 50pF	8.5ns @ 5V, 50pF
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C
Package / Case	14-CFlatPack	14-CFlatPack
Mounting Type	Surface Mount	Surface Mount
Supplier Device Package	14-CFP	14-CFP
Base Product Number	54AC20	54AC20
ECCN	EAR99	EAR99
HTSUS	8542.39.0001	8542.39.0001

Engineering Selection Recommendations

The JM54AC20SDA-RH manufactured by National Semiconductor is a direct parametric equivalent to the obsolete 54AC20/SDA-R. Selection of the substitute part is based on the following engineering criteria:

Product Status: The 54AC20/SDA-R is classified as obsolete, while the JM54AC20SDA-RH maintains active product status with current manufacturing and distribution support.

Electrical Equivalence: All electrical parameters, including supply voltage range, quiescent current, output current capabilities, input logic levels, propagation delay, and operating temperature range, are identical between the main part and substitute.

Physical Compatibility: Both parts utilize the 14-CFlatPack surface mount package with identical pin configurations and mounting requirements, enabling direct board-level substitution without layout modifications.

Compliance: Both parts share identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications, ensuring consistent regulatory treatment.

The JM54AC20SDA-RH is suitable for direct replacement in applications currently using the 54AC20/SDA-R without circuit redesign or functional compromise.

Frequently Asked Questions (FAQ)

Q: Can the JM54AC20SDA-RH be used as a direct replacement for the 54AC20/SDA-R?

A: Yes. The JM54AC20SDA-RH is a parametric equivalent with identical electrical specifications, logic configuration, and package type. Direct substitution is supported without circuit modification.

Q: Are there differences in the package or pin configuration between these parts?

A: No. Both parts use the 14-CFlatPack surface mount package with identical pin assignments and physical dimensions. Board-level compatibility is maintained.

Q: What is the primary advantage of using the JM54AC20SDA-RH over the 54AC20/SDA-R?

A: The JM54AC20SDA-RH maintains active product status with current manufacturing support, whereas the 54AC20/SDA-R is obsolete. This ensures long-term availability and supply chain continuity.

Q: Do the supply voltage and operating temperature ranges differ between these parts?

A: No. Both parts operate across 2V to 6V supply voltage and -55°C to 125°C operating temperature range with identical electrical performance characteristics.

Q: Are the propagation delay specifications the same?

A: Yes. Both parts specify a maximum propagation delay of 8.5ns at 5V with 50pF load, ensuring equivalent timing performance in digital logic applications.

Q: What are the output current capabilities of these NAND gate ICs?

A: Both parts provide 24mA output current capability for both high and low logic states, supporting equivalent fan-out and drive requirements.

Q: Are there any compliance or regulatory differences between these parts?

A: No. Both parts share identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications, ensuring consistent export control and tariff treatment.

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