LM341T-12 Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LM341T-12 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 12V output applications with 500mA current capacity in a TO-220-3 package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The LM341T-12 provides over-current, over-temperature, and short-circuit protection, making it suitable for regulated power supply applications requiring fixed 12V output.

Substiute Parts

LM341T-12

Texas InstrumentsIn Stock: 2521LM341T-12 Datasheet

Current PartRFQ

MC78M12ACTG

onsemiIn Stock: 1799MC78M12ACTG Datasheet

MFR RecommendedRFQ

MC78M12BTG

onsemiIn Stock: 1175MC78M12BTG Datasheet

MFR RecommendedRFQ

MC78M12CTG

onsemiIn Stock: 5728MC78M12CTG Datasheet

MFR RecommendedRFQ

UA78M12CKCS

Texas InstrumentsIn Stock: 1318UA78M12CKCS Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LM341T-12 is determined by the following critical parameters:

• Output voltage fixed at 12V
• Output current rating of 500mA
• Maximum input voltage of 30V or higher
• Positive output configuration
• TO-220-3 package compatibility
• Through-hole mounting
• Protection features (over-current, over-temperature, short-circuit)
• ROHS3 compliance

The substitute parts listed maintain these core electrical and mechanical specifications, ensuring functional equivalence in applications designed for the LM341T-12. Variations in operating temperature range, PSRR specifications, and product status are noted but do not prevent substitution when the primary parameters align.

Parameter Comparison

Engineering Selection Recommendations

For new designs and ongoing procurement, MC78M12BTG and MC78M12CTG are the preferred substitutes due to their active product status. Both parts maintain full electrical and mechanical compatibility with the LM341T-12 while offering improved availability and long-term supply assurance.

MC78M12BTG supports the full operating temperature range of -40°C to 125°C, matching the LM341T-12 specification. MC78M12CTG operates from 0°C to 125°C, suitable for applications not requiring extended low-temperature operation.

MC78M12ACTG and UA78M12CKCS are functionally equivalent but carry obsolete product status, limiting their suitability for new designs despite current inventory availability.

All substitute parts maintain ROHS3 compliance and are suitable for applications requiring regulated 12V output at 500mA in TO-220-3 packages.

Frequently Asked Questions (FAQ)

Q: Can MC78M12BTG directly replace LM341T-12 in existing designs?

A: Yes. MC78M12BTG maintains identical output voltage (12V), output current (500mA), input voltage rating (35V maximum), and TO-220-3 package configuration. The operating temperature range of -40°C to 125°C matches the original specification.

Q: What is the difference between MC78M12BTG and MC78M12CTG?

A: Both parts are electrically identical with 12V output and 500mA current rating. The primary difference is operating temperature range: MC78M12BTG operates from -40°C to 125°C, while MC78M12CTG operates from 0°C to 125°C. Select MC78M12BTG for applications requiring extended low-temperature performance.

Q: Why is UA78M12CKCS listed as a substitute if it has a lower maximum input voltage (30V vs 35V)?

A: UA78M12CKCS maintains the core functional parameters of 12V output, 500mA current, and TO-220-3 package. The 30V maximum input voltage is sufficient for most applications. However, designs operating near the 35V input limit should use MC78M12 variants or verify input voltage requirements before substitution.

Q: Are there differences in protection features between substitutes?

A: LM341T-12 and UA78M12CKCS include over-current protection. MC78M12ACTG, MC78M12BTG, and MC78M12CTG provide over-temperature and short-circuit protection. For applications requiring over-current protection, UA78M12CKCS is the preferred substitute.

Q: What is the significance of PSRR differences between parts?

A: The LM341T-12 specifies 71dB PSRR at 120Hz, while all substitute parts provide 80dB. Higher PSRR indicates better rejection of input voltage ripple. Substitute parts offer improved noise performance in this specification.

Q: Can I use these substitutes in new product designs?

A: MC78M12BTG and MC78M12CTG are recommended for new designs due to active product status. MC78M12ACTG and UA78M12CKCS are obsolete and should be avoided for new development to ensure long-term supply availability.