TL780-12CKC Equivalent & Substitute Parts

Part Overview

The TL780-12CKC is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. It delivers a fixed 12V 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 30V and dropout voltage of 2V at 1A.

The TL780-12CKC 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)	12V
Output Current	1.5A
Input Voltage (Max)	30V
Dropout Voltage (Max)	2V @ 1A
Output Configuration	Positive Fixed
Package / Case	TO-220-3
Protection Features	Over Current, Over Temperature, Reverse Polarity, Short Circuit
Operating Temperature	0°C ~ 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the TL780-12CKC is determined by the following critical parameters:

Fixed output voltage of 12V
Output current capability of 1.5A or greater
TO-220-3 package compatibility
Maximum input voltage of 30V or greater
Operating temperature range of 0°C to 125°C or wider
ROHS3 compliance

Substitute parts are grouped into two categories:

Manufacturer Recommended Substitutes: Parts explicitly recommended by Texas Instruments or alternative manufacturers with active or last-time-buy product status, matching or exceeding the electrical specifications of the original part.

Parametric Equivalents: Parts with identical or superior electrical characteristics and package compatibility, though some may have different product status classifications.

Parameter Comparison

Part Number	Manufacturer	Output Current	Input Voltage (Max)	Dropout Voltage (Max)	Product Status	Package	Protection Features
TL780-12CKC	Texas Instruments	1.5A	30V	2V @ 1A	Obsolete	TO-220-3	OC, OT, RP, SC
LM340T-12/NOPB	Texas Instruments	1.5A	35V	2V @ 1A	Active	TO-220-3	OT, SC
TL780-12KCS	Texas Instruments	1.5A	30V	2V @ 1A	Last Time Buy	TO-220-3	OC, OT, RP, SC
MC7812ACTG	onsemi	1A	35V	2V @ 1A	Active	TO-220-3	OT, SC
MC7812BTG	onsemi	1A	35V	2V @ 1A	Active	TO-220-3	OT, SC
MC7812CTG	onsemi	1A	35V	2V @ 1A	Active	TO-220-3	OT, SC
UA7812CKCS	Texas Instruments	1.5A	30V	2V @ 1A	Last Time Buy	TO-220-3	OC, OT, RP, SC
UA7812CKCSE3	Texas Instruments	1.5A	30V	2V @ 1A	Last Time Buy	TO-220-3	OC, OT, RP, SC
UA7812CKCT	Texas Instruments	1.5A	30V	2V @ 1A	Obsolete	TO-220-3	OC, OT, RP, SC

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

Engineering Selection Recommendations

For Active Product Status: LM340T-12/NOPB from Texas Instruments is the primary recommended substitute. It maintains 1.5A output current capability, exceeds the input voltage specification at 35V maximum, and carries active product status with ROHS3 compliance. The MC7812 series from onsemi (MC7812ACTG, MC7812BTG, MC7812CTG) are alternative active options with 1A output current and extended temperature range variants.

For Last Time Buy Status: TL780-12KCS and UA7812CKCS/UA7812CKCSE3 provide direct electrical equivalence to the original part with 1.5A output current and identical protection features. These options maintain supply availability during transition periods.

For Obsolete Designs: When the original TL780-12CKC cannot be sourced, LM340T-12/NOPB is the preferred path forward due to active status and superior input voltage rating. All substitute options maintain ROHS3 compliance and TO-220-3 package compatibility.

Current Output Consideration: Designs requiring the full 1.5A output capability should prioritize LM340T-12/NOPB, TL780-12KCS, UA7812CKCS, or UA7812CKCSE3. The MC7812 series variants are suitable only for applications requiring 1A or less.

Frequently Asked Questions (FAQ)

Q: Can MC7812ACTG replace TL780-12CKC directly?

A: MC7812ACTG is mechanically compatible in TO-220-3 package and maintains 12V output with 2V dropout voltage. However, it provides 1A maximum output current versus the original 1.5A specification. Use MC7812ACTG only if your application requires 1A or less. For full 1.5A capability, use LM340T-12/NOPB or UA7812CKCS.

Q: What is the difference between LM340T-12/NOPB and TL780-12KCS?

A: Both deliver 12V at 1.5A in TO-220-3 package. LM340T-12/NOPB has active product status and 35V maximum input voltage. TL780-12KCS is last-time-buy status with 30V maximum input voltage. LM340T-12/NOPB is preferred for new designs due to active status and higher input voltage rating.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification, matching the original TL780-12CKC specification.

Q: Can I use UA7812CKCT as a substitute?

A: UA7812CKCT matches electrical specifications and package requirements with 1.5A output current. However, it is classified as obsolete. Use only if supply constraints prevent access to active alternatives like LM340T-12/NOPB.

Q: What protection features does LM340T-12/NOPB provide?

A: LM340T-12/NOPB includes over-temperature and short-circuit protection. The original TL780-12CKC provides additional overcurrent and reverse-polarity protection. Verify your circuit design does not depend on these additional protection features before substitution.

Q: Are there temperature range differences between substitutes?

A: Most substitutes operate 0°C to 125°C, matching the original. MC7812BTG extends to -40°C to 125°C for low-temperature applications. Verify your operating environment requirements before selection.

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