TL780-05KCSE3 Equivalent & Substitute Parts

Part Overview

The TL780-05KCSE3 is a linear voltage regulator IC from Texas Instruments, delivering a fixed 5V positive output at 1.5A in a TO-220-3 package. This device is classified as Last Time Buy, indicating discontinued production with limited remaining inventory. Finding equivalent and substitute parts is necessary to ensure design continuity and long-term supply chain reliability for applications requiring 5V regulation in through-hole configurations.

Key Parameters

Parameter	Value
Manufacturer Part Number	TL780-05KCSE3
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Package / Case	TO-220-3
Output Voltage (Fixed)	5V
Output Current	1.5A
Input Voltage (Max)	25V
Voltage Dropout (Max)	2V @ 1A
Operating Temperature Range	0°C ~ 125°C
Protection Features	Over Current, Over Temperature, Reverse Polarity, Short Circuit
Product Status	Last Time Buy
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the TL780-05KCSE3 is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

Output voltage: 5V fixed
Package type: TO-220-3 through-hole
Output current capability: minimum 1.5A
Input voltage tolerance: maximum 25V or higher
Operating temperature range: 0°C ~ 125°C or wider
Protection features: Over current, over temperature, and short circuit protection

Substitution Categories:

Parametric Equivalents maintain identical electrical specifications and protection feature sets. These parts are direct replacements with no design modifications required.

Manufacturer Recommended Substitutes are active production alternatives from Texas Instruments with equivalent or superior electrical performance. These parts may have minor differences in quiescent current, PSRR, or protection feature subsets, but remain functionally compatible within the same application context.

Cross-Manufacturer Alternatives from Diodes Incorporated meet the core electrical requirements and package specification, enabling supply chain flexibility while maintaining design compatibility.

Parameter Comparison

Part Number	Manufacturer	Output Current	Input Voltage (Max)	Voltage Dropout (Max)	Operating Temp Range	Protection Features	Product Status	Inventory
TL780-05KCSE3	Texas Instruments	1.5A	25V	2V @ 1A	0°C ~ 125°C	OCP, OTP, Reverse Polarity, SCP	Last Time Buy	1312 Pcs
TL780-05KCS	Texas Instruments	1.5A	25V	2V @ 1A	0°C ~ 125°C	OCP, OTP, Reverse Polarity, SCP	Last Time Buy	6250 Pcs
LM7805CT/NOPB	Texas Instruments	1.5A	35V	2V @ 1A	0°C ~ 125°C	OCP, OTP, SCP	Active	7310 Pcs
LM340AT-5.0/NOPB	Texas Instruments	1.5A	35V	2V @ 1A	0°C ~ 125°C	OCP, SCP	Active	745 Pcs
LM340T-5.0/NOPB	Texas Instruments	1.5A	35V	2V @ 1A	0°C ~ 125°C	OTP, SCP	Active	2104 Pcs
AS7805AT-E1	Diodes Incorporated	1A	25V	2V @ 1A (Typ)	-40°C ~ 125°C	OTP, SCP	Active	21274 Pcs

Engineering Selection Recommendations

First Priority: TL780-05KCS

The TL780-05KCS is the parametric equivalent to the TL780-05KCSE3, offering identical electrical specifications, protection feature set, and input voltage rating. Both devices are Last Time Buy status from Texas Instruments. The TL780-05KCS maintains higher inventory availability (6250 Pcs vs. 1312 Pcs), making it the preferred choice for immediate procurement and design continuity.

Second Priority: LM7805CT/NOPB

The LM7805CT/NOPB is an active production part from Texas Instruments with superior input voltage tolerance (35V vs. 25V maximum). This part maintains equivalent output current (1.5A), dropout voltage, and operating temperature range. The LM7805CT/NOPB includes over current protection, over temperature protection, and short circuit protection. Active product status ensures long-term availability. Inventory is substantial at 7310 Pcs.

Third Priority: LM340AT-5.0/NOPB and LM340T-5.0/NOPB

Both LM340 variants are active production alternatives from Texas Instruments with 35V maximum input voltage rating. The LM340AT-5.0/NOPB includes over current and short circuit protection. The LM340T-5.0/NOPB includes over temperature and short circuit protection. Both maintain 1.5A output current and 2V dropout voltage specifications. These parts are suitable where the reduced protection feature set aligns with application requirements.

Fourth Priority: AS7805AT-E1

The AS7805AT-E1 from Diodes Incorporated is an active production cross-manufacturer alternative. This part matches the 25V maximum input voltage and TO-220-3 package of the original TL780-05KCSE3. The AS7805AT-E1 delivers 1A output current (vs. 1.5A), which is suitable for applications with lower current demands. Extended operating temperature range (-40°C ~ 125°C) provides additional thermal margin. High inventory availability (21274 Pcs) supports supply chain flexibility.

All substitute parts are ROHS3 compliant and REACH unaffected, maintaining regulatory alignment with the original device.

Frequently Asked Questions (FAQ)

Q: Can I use LM7805CT/NOPB as a direct replacement for TL780-05KCSE3?

A: Yes. The LM7805CT/NOPB is functionally compatible. Both devices deliver 5V fixed output at 1.5A in TO-220-3 packages with 2V dropout voltage and 0°C ~ 125°C operating range. The LM7805CT/NOPB has a higher maximum input voltage (35V vs. 25V), which provides additional design margin. Reverse polarity protection is not included in the LM7805CT/NOPB, so verify your circuit design does not depend on this feature.

Q: What is the difference between TL780-05KCSE3 and TL780-05KCS?

A: These parts are parametric equivalents with identical electrical specifications, protection features, and input voltage ratings. Both are Last Time Buy status from Texas Instruments. The primary difference is packaging designation (SE3 vs. standard). The TL780-05KCS has higher inventory availability, making it preferable for new procurement.

Q: Why does AS7805AT-E1 have lower output current (1A vs. 1.5A)?

A: The AS7805AT-E1 is rated for 1A continuous output current, while the TL780-05KCSE3 is rated for 1.5A. This part is suitable only for applications requiring 1A or less. Verify your circuit's maximum current demand before selecting this substitute.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, maintaining regulatory alignment with the original TL780-05KCSE3.

Q: What protection features should I verify when selecting a substitute?

A: The TL780-05KCSE3 includes over current, over temperature, reverse polarity, and short circuit protection. When selecting substitutes, confirm that your application design does not depend on reverse polarity protection, as some alternatives (LM7805CT/NOPB, LM340AT-5.0/NOPB, LM340T-5.0/NOPB, AS7805AT-E1) do not include this feature. Over current and short circuit protection are present in all listed alternatives.

Q: Can I use parts with higher maximum input voltage ratings?

A: Yes. Parts with higher maximum input voltage ratings (LM7805CT/NOPB and LM340 variants at 35V) are compatible with circuits designed for 25V maximum input. The higher rating provides additional design margin and protection against input voltage transients.

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