LM2940CT-9.0 Equivalent & Substitute Parts

Part Overview

The LM2940CT-9.0 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. It delivers a fixed positive 9V output at 1A maximum current in a TO-220-3 through-hole package. The device incorporates integrated protection features including over-current, over-temperature, reverse polarity, and short-circuit protection, making it suitable for applications requiring regulated 9V power supplies with moderate current demands.

The LM2940CT-9.0 is currently listed as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support legacy system maintenance or redesigns.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	9V
Maximum Output Current	1A
Maximum Input Voltage	26V
Dropout Voltage (Max)	0.8V @ 1A
Quiescent Current	10 mA
PSRR	64dB (120Hz)
Operating Temperature Range	0°C ~ 125°C
Package / Case	TO-220-3
Mounting Type	Through Hole
Protection Features	Over Current, Over Temperature, Reverse Polarity, Short Circuit

Substitute Part Grouping Explanation

Substitute parts for the LM2940CT-9.0 are identified based on strict electrical and mechanical parameter matching within the allowed tolerances for this product category:

Primary Substitution Criteria:

Fixed output voltage of 9V
Output current capability of 1A or greater
Maximum input voltage of 26V or greater
TO-220-3 package configuration
Through-hole mounting compatibility
Protection features including over-current and over-temperature

Substitute Classification:

Direct Equivalent: LM2940CT-9.0/NOPB (National Semiconductor) — Identical electrical specifications and package. Product status is Active, providing improved supply chain availability compared to the obsolete main part.

Functional Substitute: LF90CV (STMicroelectronics) — Meets core functional requirements with the same 9V fixed output and TO-220-3 package. Operates within compatible input voltage and temperature ranges. Output current is rated at 500mA, which is lower than the 1A specification of the main part. This part is suitable for applications where maximum output current does not exceed 500mA.

Parameter Comparison

Parameter	LM2940CT-9.0 (Main)	LM2940CT-9.0/NOPB (Direct Equivalent)	LF90CV (Functional Substitute)
Manufacturer	Texas Instruments	National Semiconductor	STMicroelectronics
Output Voltage (Fixed)	9V	9V	9V
Maximum Output Current	1A	1A	500mA
Maximum Input Voltage	26V	26V	16V
Dropout Voltage (Max)	0.8V @ 1A	0.8V @ 1A	0.7V @ 500mA
Quiescent Current	10 mA	10 mA	1.5 mA
PSRR	64dB (120Hz)	64dB (120Hz)	71dB ~ 56dB (120Hz ~ 10kHz)
Operating Temperature Range	0°C ~ 125°C	0°C ~ 125°C	-40°C ~ 125°C
Package / Case	TO-220-3	TO-220-3	TO-220-3
Product Status	Obsolete	Active	Obsolete
RoHS Status	RoHS non-compliant	Not specified	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement: LM2940CT-9.0/NOPB is the preferred substitute. It maintains identical electrical specifications and package configuration while offering Active product status, ensuring continued availability and supply chain support. This part is suitable for all applications currently using the LM2940CT-9.0.

For Current-Limited Applications: LF90CV is applicable only in designs where the maximum output current requirement does not exceed 500mA. The lower maximum input voltage (16V versus 26V) must be considered in the power supply design. This part offers improved RoHS3 compliance and an extended lower operating temperature limit (-40°C).

Compliance Considerations: The LM2940CT-9.0/NOPB does not specify RoHS status in the provided data. The LF90CV is ROHS3 compliant, which may be required for new designs or specific regulatory environments. Both parts are REACH Unaffected and classified as EAR99 for export control purposes.

Frequently Asked Questions (FAQ)

Q: Can LF90CV be used as a direct replacement for LM2940CT-9.0 in all applications?

A: No. LF90CV has a maximum output current rating of 500mA compared to the 1A rating of LM2940CT-9.0. It is suitable only for applications where the load current does not exceed 500mA. Additionally, the maximum input voltage is limited to 16V versus 26V for the main part.

Q: What is the difference between LM2940CT-9.0 and LM2940CT-9.0/NOPB?

A: Both parts have identical electrical specifications and package configuration. The primary difference is product status: LM2940CT-9.0 is obsolete, while LM2940CT-9.0/NOPB is active. The "/NOPB" designation indicates lead-free (no lead) packaging, which is standard for modern manufacturing.

Q: Are all substitute parts compatible with the TO-220-3 footprint?

A: Yes. All listed substitute parts use the TO-220-3 package and are compatible with existing through-hole PCB layouts designed for the LM2940CT-9.0.

Q: Which substitute part offers the best compliance for new designs?

A: LF90CV is ROHS3 compliant, making it suitable for applications with RoHS requirements. LM2940CT-9.0/NOPB does not specify RoHS compliance in the provided data and should be evaluated against specific regulatory requirements.

Q: What is the impact of the lower quiescent current in LF90CV?

A: LF90CV has a quiescent current of 1.5 mA compared to 10 mA for the main part. This results in lower standby power consumption, which may be beneficial in battery-powered or low-power applications. However, this advantage applies only when output current requirements do not exceed 500mA.

Q: Can the extended temperature range of LF90CV (-40°C to 125°C) be used as a substitute for the 0°C to 125°C range of LM2940CT-9.0?

A: Yes. The extended lower temperature limit of LF90CV (-40°C) is compatible with applications requiring the 0°C to 125°C range of the main part. This provides additional operational margin in cold environments.

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