TL780-15CKC Equivalent & Substitute Parts

Part Overview

The TL780-15CKC is a linear voltage regulator IC from Texas Instruments, delivering a fixed positive 15V output at 1.5A in a TO-220-3 package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The TL780-15CKC provides over-current, over-temperature, reverse polarity, and short-circuit protection, suitable for applications requiring regulated 15V power delivery in through-hole configurations.

Key Parameters

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

Substitute Part Grouping Explanation

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

Fixed output voltage of 15V
TO-220-3 package configuration
Through-hole mounting compatibility
ROHS3 compliance
Operating temperature range of 0°C ~ 125°C or wider

Substitute parts are grouped into two categories:

Category 1: Direct Parametric Equivalents (1.5A Output Current) Parts maintaining the full 1.5A output current specification with identical electrical characteristics and protection features.

Category 2: Functional Equivalents (1A Output Current) Parts with reduced output current (1A) but compatible voltage regulation and package, suitable for applications not requiring the full 1.5A capacity.

Category 3: Manufacturer-Recommended Alternatives (Active Status) Parts from active product lines offering improved availability and extended product lifecycle support.

Parameter Comparison

Part Number	Manufacturer	Output Current	Input Voltage (Max)	Dropout Voltage (Max)	Product Status	Operating Temperature	Protection Features	Inventory
TL780-15CKC	Texas Instruments	1.5A	30V	2V @ 1A	Obsolete	0°C ~ 125°C	OC, OT, RP, SC	789 Pcs
LM340T-15/NOPB	Texas Instruments	1.5A	35V	2V @ 1A	Active	0°C ~ 125°C	OT, SC	5091 Pcs
UA7815CKCSE3	Texas Instruments	1.5A	30V	2V @ 1A	Last Time Buy	0°C ~ 125°C	OC, OT, RP, SC	2186 Pcs
TL780-15KCS	Texas Instruments	1.5A	30V	2V @ 1A	Last Time Buy	0°C ~ 125°C	OC, OT, RP, SC	1307 Pcs
TL780-15KCSE3	Texas Instruments	1.5A	30V	2V @ 1A	Last Time Buy	0°C ~ 125°C	OC, OT, RP, SC	1464 Pcs
UA7815CKCS	Texas Instruments	1.5A	30V	2V @ 1A	Last Time Buy	0°C ~ 125°C	OC, OT, RP, SC	4506 Pcs
MC7815ABTG	onsemi	1A	35V	2V @ 1A	Active	-40°C ~ 125°C	OT, SC	24809 Pcs
MC7815ACTG	onsemi	1A	35V	2V @ 1A	Active	0°C ~ 125°C	OT, SC	1989 Pcs
MC7815BTG	onsemi	1A	35V	2V @ 1A	Active	-40°C ~ 125°C	OT, SC	20100 Pcs
MC7815CTG	onsemi	1A	35V	2V @ 1A	Active	0°C ~ 125°C	OT, SC	158550 Pcs
NCV7815BTG	onsemi	1A	35V	2V @ 1A	Obsolete	-40°C ~ 125°C	OT, SC	906 Pcs

Legend: OC = Over Current, OT = Over Temperature, RP = Reverse Polarity, SC = Short Circuit

Engineering Selection Recommendations

Primary Recommendation: LM340T-15/NOPB This Texas Instruments part is the manufacturer-recommended substitute with active product status, ensuring long-term availability and support. It maintains 1.5A output current and TO-220-3 packaging. The higher maximum input voltage (35V vs. 30V) provides additional design margin. Inventory of 5091 units supports immediate procurement.

Secondary Recommendation: MC7815CTG This onsemi part offers the highest inventory availability (158550 units) with active product status. While output current is reduced to 1A, it maintains full TO-220-3 compatibility and ROHS3 compliance. Suitable for applications where 1A output current meets system requirements.

Alternative for Extended Temperature Range: MC7815ABTG or MC7815BTG Both onsemi parts support -40°C ~ 125°C operating temperature, extending the lower temperature limit by 40°C compared to the original TL780-15CKC. MC7815CTG is preferred for standard 0°C ~ 125°C applications due to superior inventory levels.

Last-Time-Buy Alternatives: UA7815CKCS, TL780-15KCS, TL780-15KCSE3 These Texas Instruments parts maintain full parametric equivalence (1.5A output, identical protection features) but carry Last Time Buy status. Suitable for existing inventory management or applications requiring exact feature parity with the original part.

Frequently Asked Questions (FAQ)

Q: Can I use a 1A-rated substitute in place of the 1.5A TL780-15CKC? A: Yes, provided your application does not require output current exceeding 1A. The MC7815 series (MC7815ACTG, MC7815CTG, MC7815ABTG, MC7815BTG) are functionally compatible at reduced current capacity. Verify your circuit's maximum current draw before substitution.

Q: What is the difference between LM340T-15/NOPB and the original TL780-15CKC? A: Both deliver 1.5A at 15V in TO-220-3 packages. The LM340T-15/NOPB has a higher maximum input voltage (35V vs. 30V) and is currently in active production. The original TL780-15CKC is obsolete. Protection features differ: LM340T-15/NOPB includes over-temperature and short-circuit protection; the TL780-15CKC adds over-current and reverse-polarity protection.

Q: Are all substitute parts ROHS3 compliant? A: Yes, all listed substitute parts carry ROHS3 compliance certification, matching the original TL780-15CKC.

Q: Can I use NCV7815BTG as a direct replacement? A: NCV7815BTG is automotive-grade (AEC-Q100 qualified) with 1A output current and obsolete product status. It is functionally compatible but not recommended for new designs due to obsolescence and reduced current capacity.

Q: What is the significance of "Last Time Buy" status? A: Last Time Buy indicates the manufacturer will discontinue production after a specified date. Parts with this status (UA7815CKCS, TL780-15KCS, TL780-15KCSE3) remain available but should not be selected for new long-term production designs. Prioritize active-status alternatives.

Q: Do all substitute parts use 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 TL780-15CKC footprint.

Q: Which substitute offers the best long-term availability? A: MC7815CTG from onsemi provides the highest inventory (158550 units) with active product status, ensuring sustained availability for production and support applications.

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