TL780-12KCS Equivalent & Substitute Parts

Part Overview

The TL780-12KCS is a linear voltage regulator IC from Texas Instruments designed for positive fixed 12V output applications. It delivers 1.5A output current in a TO-220-3 package and is classified as Last Time Buy, indicating end-of-life status. Finding equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for new production runs and long-term support.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	12V
Output Current	1.5A
Input Voltage (Max)	30V
Voltage Dropout (Max)	2V @ 1A
Package / Case	TO-220-3
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 for the TL780-12KCS is determined by the following critical parameters:

Output Voltage: Must be fixed at 12V
Output Current Capability: Minimum 1.5A required for direct replacement; 1A variants are acceptable for reduced-load applications
Package Type: TO-220-3 form factor for mechanical and thermal compatibility
Input Voltage Rating: Maximum 30V or higher
Operating Temperature Range: 0°C to 125°C minimum
Protection Features: Over temperature and short circuit protection required; over current and reverse polarity protection preferred

Substitute parts are grouped into two categories:

MFR Recommended Substitutes: Parts with active product status and full feature parity or enhanced specifications
Parametric Equivalents: Parts with matching electrical characteristics but different product status or manufacturer

Parameter Comparison

Part Number	Manufacturer	Output Current	Input Voltage (Max)	Voltage Dropout	Package	Operating Temp	Product Status	Protection Features
TL780-12KCS	Texas Instruments	1.5A	30V	2V @ 1A	TO-220-3	0°C ~ 125°C	Last Time Buy	OC, OT, RP, SC
LM7812CT/NOPB	Texas Instruments	1A	35V	2V @ 1A	TO-220-3	0°C ~ 125°C	Active	OC, OT, SC
LM340T-12/NOPB	Texas Instruments	1.5A	35V	2V @ 1A	TO-220-3	0°C ~ 125°C	Active	OT, SC
MC7812ACTG	onsemi	1A	35V	2V @ 1A (Typ)	TO-220-3	0°C ~ 125°C	Active	OT, SC
MC7812BTG	onsemi	1A	35V	2V @ 1A (Typ)	TO-220-3	-40°C ~ 125°C	Active	OT, SC
MC7812CTG	onsemi	1A	35V	2V @ 1A (Typ)	TO-220-3	0°C ~ 125°C	Active	OT, SC
UA7812CKCS	Texas Instruments	1.5A	30V	2V @ 1A	TO-220-3	0°C ~ 125°C	Last Time Buy	OC, OT, RP, SC
UA7812CKCSE3	Texas Instruments	1.5A	30V	2V @ 1A	TO-220-3	0°C ~ 125°C	Last Time Buy	OC, OT, RP, SC
UA7812CKCT	Texas Instruments	1.5A	30V	2V @ 1A	TO-220-3	0°C ~ 125°C	Obsolete	OC, OT, RP, SC

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

Engineering Selection Recommendations

For Direct Replacement (Full Current Capability)

LM340T-12/NOPB is the primary recommended substitute. It maintains 1.5A output current, is manufactured by Texas Instruments, carries Active product status, and is ROHS3 compliant. The higher input voltage rating (35V vs. 30V) provides additional design margin. This part is suitable for applications requiring the full 1.5A output specification.

For Reduced-Load Applications (1A Output)

LM7812CT/NOPB, MC7812ACTG, MC7812BTG, and MC7812CTG are suitable where output current requirements do not exceed 1A. All are Active products with ROHS3 compliance. The onsemi MC7812 variants (ACTG, BTG, CTG) offer higher input voltage ratings (35V) and are available in larger quantities. MC7812BTG extends the operating temperature range to -40°C, suitable for industrial applications.

Parametric Equivalents (Same Electrical Characteristics)

UA7812CKCS and UA7812CKCSE3 provide identical electrical specifications to the TL780-12KCS, including 1.5A output current and full protection features. Both are Last Time Buy status. UA7812CKCT is electrically equivalent but classified as Obsolete and should be avoided for new designs.

Compliance and Certification

All recommended substitutes are ROHS3 compliant and REACH unaffected, meeting regulatory requirements equivalent to the original part.

Frequently Asked Questions (FAQ)

Q: Can I use a 1A regulator as a direct replacement for the TL780-12KCS?

A: Only if your application circuit draws a maximum of 1A. The TL780-12KCS is rated for 1.5A output. Using a 1A-rated part in a 1.5A application will cause thermal stress and potential failure. Verify your actual load current before substitution.

Q: What is the difference between LM7812CT/NOPB and LM340T-12/NOPB?

A: Both are Texas Instruments 12V regulators in TO-220-3 packages. The LM340T-12/NOPB delivers 1.5A (matching the original part) while LM7812CT/NOPB delivers 1A. The LM340T-12/NOPB is the preferred substitute for full current compatibility.

Q: Are onsemi MC7812 variants pin-compatible with the TL780-12KCS?

A: Yes. All MC7812 variants (ACTG, BTG, CTG) use the TO-220-3 package with identical pin configuration. However, they are rated for 1A output, not 1.5A. Verify load requirements before selection.

Q: Why is the input voltage rating higher on some substitutes?

A: Newer designs often include higher input voltage ratings for improved design margin and robustness. A 35V maximum input rating provides additional protection against transient overvoltage compared to the original 30V specification. This is a beneficial enhancement.

Q: Can I use UA7812CKCS or UA7812CKCSE3 instead of LM340T-12/NOPB?

A: Electrically, yes. Both UA7812 variants match the TL780-12KCS specifications exactly. However, both are Last Time Buy status, indicating limited future availability. For new designs, LM340T-12/NOPB is preferred due to Active product status and better long-term supply assurance.

Q: What does "Last Time Buy" mean?

A: Last Time Buy indicates the manufacturer will no longer produce the part after a specified date. Existing inventory may be available, but no new manufacturing runs are planned. For long-term production, select an Active status part.

Q: Is the TO-220-3 package the same across all these parts?

A: Yes. All listed parts use the TO-220-3 package, ensuring mechanical and thermal compatibility. Mounting and heatsinking requirements remain identical.

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