TL780-05CKTER Equivalent & Substitute Parts

Part Overview

The TL780-05CKTER is a linear voltage regulator IC from Texas Instruments designed for positive fixed 5V output at 1.5A in a DPAK-2 (TO-252-4) surface mount package. This device provides regulated power supply functionality with integrated protection features including over-current, over-temperature, reverse polarity, and short-circuit protection. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	TL780-05CKTER
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Voltage (Fixed)	5V
Output Current	1.5A
Input Voltage (Max)	25V
Voltage Dropout (Max)	2V @ 1A
Package / Case	TO-252-4, DPAK (3 Leads + Tab)
Operating Temperature	0°C ~ 125°C
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

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

Output Voltage Match: All substitute parts must provide fixed 5V output to maintain circuit compatibility.

Output Current Rating: All substitutes must support minimum 1.5A output current.

Package Compatibility: Substitutes are grouped by package type. The original DPAK (TO-252-4) package can be replaced with TO-263 (DDPAK-3) variants, which share similar thermal and electrical characteristics despite different physical form factors.

Input Voltage Rating: Substitutes must support the maximum input voltage requirements of the application. The original part specifies 25V maximum input; substitutes with higher ratings (35V) provide additional design margin.

Protection Features: The original part includes over-current, over-temperature, reverse polarity, and short-circuit protection. Substitute selection should consider protection feature availability.

Product Status: Active status substitutes ensure long-term availability and ongoing manufacturer support.

Parameter Comparison

Parameter	TL780-05CKTER (Main)	LM340S-5.0/NOPB	LM340SX-5.0/NOPB	TL780-05CKTTR	LM340SX-12/NOPB
Output Voltage	5V	5V	5V	5V	12V
Output Current	1.5A	1.5A	1.5A	1.5A	1.5A
Input Voltage (Max)	25V	35V	35V	25V	35V
Voltage Dropout (Max)	2V @ 1A	2V @ 1A	2V @ 1A	2V @ 1A	2V @ 1A
Package / Case	TO-252-4, DPAK	TO-263-4, D2PAK	TO-263-4, D2PAK	TO-263-4, D2PAK	TO-263-4, D2PAK
Operating Temperature	0°C ~ 125°C	0°C ~ 125°C	0°C ~ 125°C	0°C ~ 125°C	0°C ~ 125°C
Product Status	Obsolete	Active	Active	Obsolete	Active
PSRR	85dB (120Hz)	80dB (120Hz)	80dB (120Hz)	85dB (120Hz)	80dB (120Hz)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Functional Replacement (5V Output):

LM340SX-5.0/NOPB is the primary substitute for the TL780-05CKTER. This part is active status, ensuring long-term availability. It provides identical 5V output and 1.5A current rating with higher input voltage tolerance (35V vs. 25V). The TO-263 package requires PCB layout modification but offers superior thermal performance. This part is available in high inventory (19,540 units).

LM340S-5.0/NOPB is an alternative active-status substitute in TO-263 packaging with equivalent electrical specifications. Inventory availability is 5,300 units.

For Package-Compatible Replacement (Same DPAK Package):

TL780-05CKTTR maintains the original TO-263 package footprint compatibility and is from the same manufacturer base product line. However, this part is also obsolete status, providing only temporary procurement relief.

For Applications Requiring Different Output Voltage:

LM340SX-12/NOPB provides 12V fixed output with identical 1.5A current rating and TO-263 packaging. This substitute applies only to applications where 12V output is functionally acceptable.

Compliance Considerations:

All substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the original part's regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can LM340SX-5.0/NOPB directly replace TL780-05CKTER without PCB modification?

A: No. The LM340SX-5.0/NOPB uses TO-263 (DDPAK-3) packaging while the original uses TO-252-4 (DPAK). The pinout and footprint differ, requiring PCB layout changes. However, the electrical specifications are compatible.

Q: What is the difference between LM340S-5.0/NOPB and LM340SX-5.0/NOPB?

A: Both parts provide identical 5V output at 1.5A in TO-263 packaging. The primary difference is packaging format: LM340S-5.0/NOPB is supplied in Tube packaging, while LM340SX-5.0/NOPB is supplied in Cut Tape (CT) & Digi-Reel format. Electrical performance is equivalent.

Q: Why does the input voltage rating differ between the original and substitutes?

A: The TL780-05CKTER specifies 25V maximum input, while LM340 series substitutes support 35V maximum input. The higher rating in substitutes provides additional design margin and does not affect compatibility in applications operating within the original 25V specification.

Q: Can I use LM340SX-12/NOPB as a substitute?

A: LM340SX-12/NOPB is electrically compatible only in applications where 12V output is required. It is not suitable for circuits designed for 5V output.

Q: What protection features should I verify when substituting?

A: The original TL780-05CKTER includes over-current, over-temperature, reverse polarity, and short-circuit protection. LM340 series substitutes provide over-temperature and short-circuit protection. Reverse polarity and over-current protection availability should be confirmed for your specific application requirements.

Q: Are all substitute parts currently in stock?

A: LM340SX-5.0/NOPB has the highest inventory availability at 19,540 units. LM340S-5.0/NOPB has 5,300 units available. TL780-05CKTTR (obsolete) has 1,766 units. Verify current inventory status with your supplier before design commitment.

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