TL780-05CKC Equivalent & Substitute Parts

Part Overview

The TL780-05CKC 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 in a TO-220-3 package. The device features integrated protection against overcurrent, overtemperature, reverse polarity, and short circuit conditions, with a maximum input voltage of 25V and dropout voltage of 2V at 1A.

The TL780-05CKC is currently listed as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or maintenance requirements.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	5V
Output Current	1.5A
Input Voltage (Max)	25V
Dropout Voltage (Max)	2V @ 1A
Output Configuration	Positive Fixed
Package / Case	TO-220-3
Operating Temperature Range	0°C ~ 125°C
Protection Features	Over Current, Over Temperature, Reverse Polarity, Short Circuit
PSRR	85dB (120Hz)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the TL780-05CKC is determined by the following critical parameters:

Fixed output voltage of 5V
Output current capability of 1.5A or greater
TO-220-3 package configuration
Through-hole mounting type
Operating temperature range compatibility (0°C ~ 125°C minimum)
ROHS3 compliance
Positive fixed output configuration

Substitute parts are grouped into two categories:

MFR Recommended Substitutes: Parts with full parameter compatibility and active or last-time-buy product status from established manufacturers.

Parametric Equivalents: Parts meeting all electrical and mechanical substitution criteria with equivalent performance characteristics.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage (Max)	Package	Operating Temp	Product Status	Inventory
TL780-05CKC	Texas Instruments	5V	1.5A	25V	2V @ 1A	TO-220-3	0°C ~ 125°C	Obsolete	931 Pcs
LM340AT-5.0/NOPB	Texas Instruments	5V	1.5A	35V	2V @ 1A	TO-220-3	0°C ~ 125°C	Active	745 Pcs
LM340T-5.0/NOPB	Texas Instruments	5V	1.5A	35V	2V @ 1A	TO-220-3	0°C ~ 125°C	Active	2104 Pcs
TL780-05KCS	Texas Instruments	5V	1.5A	25V	2V @ 1A	TO-220-3	0°C ~ 125°C	Last Time Buy	6250 Pcs
TL780-05KCSE3	Texas Instruments	5V	1.5A	25V	2V @ 1A	TO-220-3	0°C ~ 125°C	Last Time Buy	1312 Pcs
AS7805AT-E1	Diodes Incorporated	5V	1A	25V	2V @ 1A (Typ)	TO-220-3	-40°C ~ 125°C	Active	21274 Pcs
MC7805CT-BP	Micro Commercial Co	5V	1.5A	35V	2V @ 1A (Typ)	TO-220-3	0°C ~ 125°C	Active	4165 Pcs

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

LM340T-5.0/NOPB and LM340AT-5.0/NOPB from Texas Instruments are the preferred substitutes. Both are active products with identical output specifications (5V, 1.5A), matching package configuration (TO-220-3), and equivalent operating temperature range. These parts maintain full design compatibility with the obsolete TL780-05CKC while offering improved input voltage tolerance (35V vs. 25V).

Secondary Substitutes (Full Parameter Match):

TL780-05KCS and TL780-05KCSE3 are direct parametric equivalents from the same manufacturer base product line. Both maintain identical electrical specifications and package configuration. These parts are designated as last-time-buy, indicating limited future availability.

Alternative Substitute (Current Output Consideration):

AS7805AT-E1 from Diodes Incorporated meets all substitution criteria with the exception of output current rating (1A vs. 1.5A). This part is suitable only for applications where the load current does not exceed 1A. The device offers extended operating temperature range (-40°C ~ 125°C) and is currently in active production with high inventory availability.

Supplementary Substitute (Enhanced Input Voltage Rating):

MC7805CT-BP from Micro Commercial Co provides 1.5A output current with enhanced input voltage rating (35V). This part is suitable for applications requiring higher input voltage tolerance while maintaining identical output specifications and package configuration.

All recommended substitutes are ROHS3 compliant and maintain through-hole mounting compatibility.

Frequently Asked Questions (FAQ)

Q: Can LM340AT-5.0/NOPB directly replace TL780-05CKC in my design?

A: Yes. Both parts deliver 5V at 1.5A in TO-220-3 packages with identical dropout voltage specifications and operating temperature ranges. The LM340AT-5.0/NOPB is an active product with higher input voltage rating (35V vs. 25V), making it a direct functional replacement.

Q: What is the difference between LM340AT-5.0/NOPB and LM340T-5.0/NOPB?

A: Both parts are functionally equivalent for the TL780-05CKC application. The primary difference is quiescent current (Iq): LM340AT-5.0/NOPB draws 6 mA while LM340T-5.0/NOPB draws 8 mA. Both maintain identical output voltage, current, and package specifications. LM340T-5.0/NOPB has higher inventory availability (2104 pcs vs. 745 pcs).

Q: Why is AS7805AT-E1 listed as a substitute if it only provides 1A output?

A: AS7805AT-E1 meets all electrical and mechanical substitution criteria except output current capacity. It is suitable only for applications where load current does not exceed 1A. The part offers extended temperature range and high inventory availability (21274 pcs), making it valuable for current-limited applications.

Q: Are TL780-05KCS and TL780-05KCSE3 still available?

A: Both parts are designated as last-time-buy, indicating limited future availability. TL780-05KCS has higher current inventory (6250 pcs) compared to TL780-05KCSE3 (1312 pcs). These parts are parametric equivalents to the obsolete TL780-05CKC and should be considered for immediate procurement if required.

Q: What is the advantage of MC7805CT-BP over other substitutes?

A: MC7805CT-BP provides 1.5A output current with enhanced input voltage rating (35V vs. 25V on the original TL780-05CKC). This makes it suitable for applications with higher input voltage requirements while maintaining identical output specifications and TO-220-3 package configuration.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant, matching the compliance status of the original TL780-05CKC.

Q: Can I use these substitutes interchangeably in production?

A: Substitutes with identical electrical specifications (5V, 1.5A, TO-220-3) are mechanically and electrically interchangeable. AS7805AT-E1 is interchangeable only in applications where output current does not exceed 1A. Verify PCB layout compatibility and thermal management requirements for your specific application.

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