BA05T Linear Voltage Regulator - Equivalent & Substitute Parts

Part Overview

The BA05T is a linear voltage regulator IC manufactured by Rohm Semiconductor, designed to provide a fixed 5V output at 1A current capacity in a TO-220-3 package. This device is classified as not for new designs, indicating it has been superseded in Rohm's product portfolio. Finding equivalent substitute parts is necessary for ongoing maintenance, repair, and legacy system support where BA05T components are no longer readily available or where design flexibility permits component substitution.

Substiute Parts

BA05T

Rohm SemiconductorIn Stock: 19786BA05T Datasheet

Current PartRFQ

LM2940T-5.0/LF08

Texas InstrumentsIn Stock: 3719LM2940T-5.0/LF08 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the BA05T is determined by the following critical parameters:

• Fixed output voltage of 5V
• Output current capability of 1A minimum
• TO-220-3 package compatibility (mechanical and thermal interface)
• Maximum input voltage rating of 25V or higher
• Operating temperature range spanning -40°C to 85°C minimum
• RoHS3 compliance for regulatory alignment
• Protection features including over-current and over-temperature protection

The LM2940T-5.0/LF08 from Texas Instruments meets these substitution criteria. Both devices share identical output voltage and current specifications, compatible package geometry, and equivalent protection mechanisms. Differences in quiescent current, PSRR, and maximum input voltage do not prevent functional substitution in applications designed for the BA05T.

Parameter Comparison

Engineering Selection Recommendations

The LM2940T-5.0/LF08 is a direct functional substitute for the BA05T in applications requiring a fixed 5V, 1A linear regulator in TO-220-3 package format. Both devices maintain ROHS3 compliance and equivalent regulatory status. The LM2940T-5.0/LF08 offers the advantage of active product status, ensuring continued availability and manufacturer support. The extended operating temperature range (-40°C to 125°C versus -40°C to 85°C) and additional protection features (reverse polarity and short circuit) provide enhanced robustness in the substitute device. The higher quiescent current (10 mA versus 2.5 mA) should be evaluated in applications where standby power consumption is critical.

Frequently Asked Questions (FAQ)

Q: Can the LM2940T-5.0/LF08 directly replace the BA05T without circuit modifications?

A: Yes. Both devices provide identical 5V fixed output at 1A in the same TO-220-3 package. Pin configuration and functional behavior are compatible. No circuit modifications are required for direct substitution.

Q: What is the significance of the product status difference?

A: The BA05T is marked "Not For New Designs," indicating Rohm has discontinued active development and support. The LM2940T-5.0/LF08 maintains "Active" status, ensuring ongoing availability, technical support, and manufacturing consistency.

Q: How does the higher quiescent current of the LM2940T-5.0/LF08 affect system performance?

A: The LM2940T-5.0/LF08 draws 10 mA quiescent current compared to the BA05T's 2.5 mA. In applications with continuous operation, this represents a 7.5 mA increase in standby power consumption. For battery-powered or low-power standby applications, this difference should be evaluated against system requirements.

Q: Are there thermal considerations when substituting these devices?

A: Both devices use the TO-220-3 package with identical mechanical dimensions. Thermal performance depends on PCB layout, heatsinking, and ambient conditions. The LM2940T-5.0/LF08 supports operation to 125°C versus the BA05T's 85°C maximum, providing additional thermal margin in high-temperature environments.

Q: What protection features distinguish the LM2940T-5.0/LF08?

A: The LM2940T-5.0/LF08 includes reverse polarity and short circuit protection in addition to over-current and over-temperature protection found in the BA05T. These additional protections enhance system robustness against fault conditions.