LM2940CS-9.0 Equivalent & Substitute Parts

Part Overview

The LM2940CS-9.0 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 9V output at 1A current capacity in a TO-263 (DDPAK-3) surface mount package. This device provides regulated power with integrated protection features including over-current, over-temperature, reverse polarity, and short-circuit protection. The main part is classified as obsolete, making equivalent substitute parts necessary for ongoing production and maintenance applications where 9V regulated power supply is required.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	9V
Output Current	1A
Input Voltage (Max)	26V
Voltage Dropout (Max)	0.8V @ 1A
Quiescent Current	10 mA
PSRR	64dB (120Hz)
Operating Temperature Range	0°C ~ 125°C
Package Type	TO-263 (DDPAK-3)
Protection Features	Over Current, Over Temperature, Reverse Polarity, Short Circuit

Substitute Part Grouping Explanation

Substitution for the LM2940CS-9.0 is determined by strict equivalence across the following critical parameters:

Output voltage specification: 9V fixed
Output current rating: 1A minimum
Input voltage tolerance: 26V maximum
Voltage dropout characteristics: 0.8V @ 1A maximum
Package configuration: TO-263 (DDPAK-3) surface mount
Protection feature set: Over-current, over-temperature, reverse polarity, and short-circuit protection
Operating temperature range: 0°C ~ 125°C

The LM2940CS-9.0/NOPB from National Semiconductor meets all these criteria and qualifies as a direct substitute. Both parts share identical electrical specifications and mechanical packaging, enabling direct board-level replacement without circuit modification.

Parameter Comparison

Parameter	LM2940CS-9.0 (TI)	LM2940CS-9.0/NOPB (NSM)
Manufacturer	Texas Instruments	National Semiconductor
Product Status	Obsolete	Active
Output Voltage	9V	9V
Output Current	1A	1A
Input Voltage (Max)	26V	26V
Voltage Dropout (Max)	0.8V @ 1A	0.8V @ 1A
Quiescent Current	10 mA	10 mA
PSRR	64dB (120Hz)	64dB (120Hz)
Operating Temperature	0°C ~ 125°C	0°C ~ 125°C
Package	TO-263 (DDPAK-3)	TO-263 (DDPAK-3)
Protection Features	Over Current, Over Temperature, Reverse Polarity, Short Circuit	Over Current, Over Temperature, Reverse Polarity, Short Circuit

Engineering Selection Recommendations

The LM2940CS-9.0/NOPB is the appropriate substitute for the obsolete LM2940CS-9.0. The substitute part carries Active product status, ensuring continued availability and manufacturing support. Both parts are classified under ECCN EAR99 and HTSUS 8542.39.0001, maintaining consistent regulatory and trade compliance. The National Semiconductor variant is available in bulk packaging with confirmed inventory stock, supporting production requirements without design or layout modifications.

Frequently Asked Questions (FAQ)

Q: Can the LM2940CS-9.0/NOPB replace the LM2940CS-9.0 in existing designs?

A: Yes. Both parts are electrically and mechanically identical across all specified parameters. Direct substitution is possible without circuit redesign or PCB layout changes.

Q: What does the "/NOPB" suffix indicate?

A: The "/NOPB" designation indicates the part is supplied without lead (Pb) plating, reflecting RoHS compliance in the manufacturing process.

Q: Are there any differences in protection features between the two parts?

A: No. Both parts provide identical protection: over-current, over-temperature, reverse polarity, and short-circuit protection.

Q: What is the significance of the product status difference?

A: The original LM2940CS-9.0 is obsolete and no longer manufactured. The LM2940CS-9.0/NOPB maintains Active status, ensuring long-term availability and supply chain continuity.

Q: Do both parts require the same PCB footprint?

A: Yes. Both parts use the TO-263 (DDPAK-3) package, requiring identical PCB footprints and mounting procedures.

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