TL780-05KCS Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The TL780-05KCS is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. It delivers a fixed positive 5V output at 1.5A maximum current in a TO-220-3 through-hole package. This device is currently in Last Time Buy status, indicating discontinued production. Finding equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications requiring 5V regulation.

Key Parameters

Parameter	Value
Manufacturer Part Number	TL780-05KCS
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Package / Case	TO-220-3
Output Voltage (Fixed)	5V
Output Current	1.5A
Input Voltage (Max)	25V
Voltage Dropout (Max)	2V @ 1A
PSRR	85dB (120Hz)
Operating Temperature	0°C ~ 125°C
Protection Features	Over Current, Over Temperature, Reverse Polarity, Short Circuit
Product Status	Last Time Buy
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the TL780-05KCS is determined by the following critical parameters:

Output Voltage: Must be fixed at 5V
Output Current Capability: Minimum 1.5A required
Package Type: TO-220-3 through-hole mounting
Input Voltage Rating: Maximum input voltage of 25V or higher
Voltage Dropout: Maximum 2V @ 1A or lower
Operating Temperature Range: 0°C to 125°C minimum
Protection Features: Over current, over temperature, and short circuit protection required

Substitute parts are grouped into two categories:

MFR Recommended Substitutes (Active product status, full feature parity):

LM7805CT/NOPB
LM340AT-5.0/NOPB
LM340T-5.0/NOPB

Parametric Equivalent (Identical electrical specifications):

TL780-05KCSE3

Cross-Manufacturer Alternative (Diodes Incorporated):

AS7805AT-E1

Parameter Comparison

Parameter	TL780-05KCS	LM7805CT/NOPB	LM340AT-5.0/NOPB	LM340T-5.0/NOPB	TL780-05KCSE3	AS7805AT-E1
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Diodes Incorporated
Output Voltage	5V	5V	5V	5V	5V	5V
Output Current	1.5A	1.5A	1.5A	1.5A	1.5A	1A
Input Voltage (Max)	25V	35V	35V	35V	25V	25V
Voltage Dropout (Max)	2V @ 1A	2V @ 1A	2V @ 1A	2V @ 1A	2V @ 1A	2V @ 1A (Typ)
PSRR	85dB (120Hz)	80dB (120Hz)	70dB (120Hz)	80dB (120Hz)	85dB (120Hz)	70dB (120Hz)
Package / Case	TO-220-3	TO-220-3	TO-220-3	TO-220-3	TO-220-3	TO-220-3
Operating Temperature	0°C ~ 125°C	0°C ~ 125°C	0°C ~ 125°C	0°C ~ 125°C	0°C ~ 125°C	-40°C ~ 125°C
Product Status	Last Time Buy	Active	Active	Active	Last Time Buy	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Recommended for New Designs)

LM7805CT/NOPB and LM340AT-5.0/NOPB are the preferred alternatives. Both are active products from Texas Instruments with identical output current capability (1.5A) and voltage dropout specifications. LM7805CT/NOPB offers higher input voltage tolerance (35V vs. 25V) and is suitable for applications with variable input sources. LM340AT-5.0/NOPB maintains the same electrical performance with ROHS3 compliance and unlimited moisture sensitivity rating.

Secondary Substitute (Parametric Equivalent)

TL780-05KCSE3 provides identical electrical specifications and protection features to the TL780-05KCS. However, this part is also in Last Time Buy status and should not be selected for new designs requiring long-term supply assurance.

Cross-Manufacturer Alternative

AS7805AT-E1 from Diodes Incorporated is an active product with compatible TO-220-3 packaging and 5V fixed output. This part has a reduced output current rating of 1A, making it suitable only for applications requiring less than 1A. The extended operating temperature range (-40°C to 125°C) provides additional thermal margin for demanding environments.

Compliance Considerations

All substitute parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with the original TL780-05KCS.

Frequently Asked Questions (FAQ)

Q: Can I use AS7805AT-E1 as a direct replacement for TL780-05KCS?

A: AS7805AT-E1 is compatible in package and output voltage but has a reduced maximum output current of 1A compared to the 1.5A rating of TL780-05KCS. Use this substitute only if your application requires 1A or less.

Q: What is the difference between LM7805CT/NOPB and LM340AT-5.0/NOPB?

A: Both parts deliver 1.5A at 5V output with identical voltage dropout. LM7805CT/NOPB accepts input voltages up to 35V, while LM340AT-5.0/NOPB is rated to 35V as well. LM340AT-5.0/NOPB has lower PSRR (70dB vs. 80dB). Both are suitable for the TL780-05KCS application.

Q: Why is TL780-05KCSE3 not recommended for new designs?

A: TL780-05KCSE3 is in Last Time Buy status, indicating discontinued production. For long-term supply reliability, select active products such as LM7805CT/NOPB or LM340AT-5.0/NOPB.

Q: Are all substitute parts available in the same TO-220-3 package?

A: Yes. All listed substitutes use TO-220-3 through-hole packaging, ensuring mechanical and thermal compatibility with the original TL780-05KCS footprint.

Q: What protection features should I verify when selecting a substitute?

A: The TL780-05KCS includes over current, over temperature, reverse polarity, and short circuit protection. LM7805CT/NOPB and LM340T-5.0/NOPB provide over current, over temperature, and short circuit protection. AS7805AT-E1 provides over temperature and short circuit protection. Verify that your application does not depend on reverse polarity protection if selecting AS7805AT-E1.

Q: Can I use these substitutes in applications with input voltages above 25V?

A: LM7805CT/NOPB and LM340AT-5.0/NOPB are rated for input voltages up to 35V and can be used in higher voltage applications. TL780-05KCSE3 and AS7805AT-E1 are limited to 25V maximum input, matching the original TL780-05KCS specification.

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