LM7810CT Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LM7810CT is a linear voltage regulator IC manufactured by onsemi, designed to provide a fixed positive 10V output at 1A current capacity in a TO-220-3 package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The LM7810CT serves applications requiring stable 10V regulation from input sources up to 35V with integrated over-temperature and short-circuit protection.

Substiute Parts

LM7810CT

onsemiIn Stock: 2084LM7810CT Datasheet

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L78S10CV

STMicroelectronicsIn Stock: 10101L78S10CV Datasheet

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LM2940T-10.0/NOPB

Texas InstrumentsIn Stock: 2234LM2940T-10.0/NOPB Datasheet

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UA7810CKCS

Texas InstrumentsIn Stock: 1816UA7810CKCS Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LM7810CT are selected based on the following critical parameters that determine functional compatibility:

• Fixed output voltage of 10V
• TO-220-3 package configuration for mechanical and thermal compatibility
• Output current rating equal to or greater than 1A
• Input voltage maximum rating of 26V or higher
• Operating temperature range that encompasses or exceeds -40°C ~ 125°C
• Protection features including over-temperature and short-circuit protection

The three substitute parts listed below meet these criteria with varying enhancements in current capacity, input voltage tolerance, and protection features.

Parameter Comparison

Engineering Selection Recommendations

LM2940T-10.0/NOPB (Texas Instruments) is the primary substitute for new designs and production continuity. This part maintains identical output voltage and current specifications while offering active product status, ensuring long-term availability. The lower dropout voltage (1V vs. 2V) provides improved efficiency. RoHS3 compliance and reverse polarity protection enhance design robustness. The input voltage maximum of 26V is suitable for most 10V regulation applications, though designs requiring the full 35V input range of the original LM7810CT should verify compatibility.

UA7810CKCS (Texas Instruments) provides increased output current capacity (1.5A vs. 1A) with superior PSRR performance (78dB vs. 71dB), making it suitable for applications requiring enhanced noise rejection or higher current delivery. Last Time Buy status indicates limited future availability. The input voltage maximum of 28V accommodates most standard applications.

L78S10CV (STMicroelectronics) offers the highest output current rating (2A) and maintains the original 35V input voltage maximum. This part is suitable for designs requiring current headroom or operating at the upper input voltage limit. Obsolete status and lower PSRR (47dB) should be considered for new designs.

Frequently Asked Questions (FAQ)

Q: Can the LM2940T-10.0/NOPB directly replace the LM7810CT in existing designs?

A: Yes, for applications where input voltage does not exceed 26V. Both parts share identical TO-220-3 packaging, 10V fixed output, and 1A current rating. Pin configuration is identical. Verify your input voltage specification before substitution.

Q: What is the primary advantage of the L78S10CV substitute?

A: The L78S10CV provides double the output current capacity (2A vs. 1A) while maintaining the original 35V maximum input voltage specification. This makes it suitable for designs requiring current margin or operating at higher input voltages.

Q: Why does the UA7810CKCS have a higher PSRR value?

A: PSRR (Power Supply Rejection Ratio) measures the regulator's ability to reject input voltage ripple. The UA7810CKCS achieves 78dB at 120Hz compared to the LM7810CT's 71dB, providing superior noise attenuation for sensitive analog circuits.

Q: Are all substitute parts RoHS3 compliant?

A: The LM2940T-10.0/NOPB, UA7810CKCS, and L78S10CV are all RoHS3 compliant. The original LM7810CT RoHS status is not specified in available documentation.

Q: What is the significance of "Last Time Buy" status for the UA7810CKCS?

A: Last Time Buy indicates that Texas Instruments has announced end-of-life for this part. Existing inventory may be available, but future production is not guaranteed. For new designs requiring long-term support, the active-status LM2940T-10.0/NOPB is recommended.

Q: Can I use a substitute with higher current rating in place of the LM7810CT?

A: Yes. A regulator with higher current capacity (such as the L78S10CV at 2A or UA7810CKCS at 1.5A) can safely replace a 1A device. The circuit will draw only the current it requires. Ensure thermal management is adequate for your application's actual current draw.

Q: What is the impact of different dropout voltages on circuit design?

A: Dropout voltage determines the minimum input-to-output voltage differential required for regulation. The LM2940T-10.0/NOPB's 1V dropout is more efficient than the LM7810CT's 2V dropout, allowing operation with lower input voltages or reducing heat dissipation in the regulator.