TL780-15KCSE3 Equivalent & Substitute Parts

Part Overview

The TL780-15KCSE3 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 15V output at 1.5A in a TO-220-3 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 Last Time Buy, indicating limited future availability. Equivalent and substitute parts are necessary to ensure design continuity, maintain supply chain flexibility, and support long-term production requirements.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	15V
Output Current	1.5A
Input Voltage (Max)	30V
Voltage Dropout (Max)	2V @ 1A
Package Type	TO-220-3
Mounting Type	Through Hole
Operating Temperature Range	0°C ~ 125°C
Protection Features	Over Current, Over Temperature, Reverse Polarity, Short Circuit
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the TL780-15KCSE3 is determined by the following critical parameters:

Output voltage must be fixed at 15V
Output current capability must be ≥1.5A (or ≥1A for current-limited applications)
Package must be TO-220-3 or compatible TO-220 variant
Input voltage rating must support maximum 30V or higher
Operating temperature range must cover 0°C ~ 125°C minimum
RoHS3 compliance required
Mounting type must be Through Hole

Parts are grouped into two categories: MFR Recommended substitutes (active product status, higher availability) and Parametric Equivalents (matching electrical specifications, including Last Time Buy status parts).

Parameter Comparison

Part Number	Manufacturer	Output Current	Input Voltage (Max)	Output Voltage	Package	Product Status	Inventory
TL780-15KCSE3	Texas Instruments	1.5A	30V	15V	TO-220-3	Last Time Buy	1464 Pcs
LM7815CT/NOPB	Texas Instruments	1A	35V	15V	TO-220-3	Active	3400 Pcs
LM340T-15/NOPB	Texas Instruments	1.5A	35V	15V	TO-220-3	Active	5091 Pcs
UA7815CKCSE3	Texas Instruments	1.5A	30V	15V	TO-220-3	Last Time Buy	2186 Pcs
L7815ACV-DG	STMicroelectronics	1.5A	35V	15V	TO-220-3	Active	4100 Pcs
MC7815ABTG	onsemi	1A	35V	15V	TO-220-3	Active	24809 Pcs
MC7815ACTG	onsemi	1A	35V	15V	TO-220-3	Active	1989 Pcs
MC7815BTG	onsemi	1A	35V	15V	TO-220-3	Active	20100 Pcs
MC7815CTG	onsemi	1A	35V	15V	TO-220-3	Active	158550 Pcs
NCV7815BTG	onsemi	1A	35V	15V	TO-220-3	Obsolete	906 Pcs
TL780-15KCS	Texas Instruments	1.5A	30V	15V	TO-220-3	Last Time Buy	1307 Pcs

Engineering Selection Recommendations

Primary Recommendation for Full Specification Match: LM340T-15/NOPB (Texas Instruments) provides identical 1.5A output current capability with Active product status, ensuring long-term availability. Input voltage rating of 35V exceeds the original 30V specification, providing additional design margin. This part is the preferred direct replacement.

Alternative for Active Supply Chain: L7815ACV-DG (STMicroelectronics) matches 1.5A output current and TO-220-3 package with Active status. Higher input voltage rating (35V) and established inventory (4100 Pcs) support production continuity.

Current-Limited Substitutes (1A Output): MC7815CTG (onsemi) offers the highest inventory availability (158550 Pcs) with Active status. Suitable for applications where 1A output current is acceptable. MC7815ABTG and MC7815ACTG provide equivalent specifications with lower inventory levels.

Parametric Equivalents (Last Time Buy Status): UA7815CKCSE3 and TL780-15KCS maintain identical electrical specifications and 1.5A output current. These parts share Last Time Buy status with the original TL780-15KCSE3 and should be prioritized only if supply chain constraints prevent access to Active alternatives.

Not Recommended: NCV7815BTG is classified as Obsolete and should not be selected for new designs despite automotive qualification.

Frequently Asked Questions (FAQ)

Q: Can I use a 1A output part to replace the 1.5A TL780-15KCSE3? A: Only if your application circuit draws maximum 1A. The 1A-rated parts (MC7815 series) will operate within specification at reduced current levels. Verify your actual load current before substitution.

Q: What is the difference between TO-220-3 and TO-220 package designations? A: Both refer to the same three-pin through-hole package. The "-3" suffix explicitly indicates three pins. All listed substitutes use compatible TO-220-3 pinouts and are mechanically interchangeable.

Q: Why do some substitutes have higher input voltage ratings (35V vs 30V)? A: Higher input voltage ratings provide additional design margin and protection against transient overvoltage conditions. Parts rated for 35V input are fully compatible with 30V maximum input designs.

Q: Should I select parts with Last Time Buy status? A: Last Time Buy parts have limited future availability. For new designs or long-term production, select Active status parts such as LM340T-15/NOPB or L7815ACV-DG to ensure supply continuity.

Q: Are all listed parts RoHS3 compliant? A: Yes. All parts in this reference meet ROHS3 compliance requirements and are suitable for applications requiring RoHS certification.

Q: What protection features should I verify when substituting? A: The TL780-15KCSE3 includes over-current, over-temperature, reverse polarity, and short-circuit protection. Most substitutes include over-temperature and short-circuit protection. Verify reverse polarity protection availability if your application requires it.

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