BA08ST Linear Voltage Regulator - Equivalent & Substitute Parts

Part Overview

The BA08ST is a linear voltage regulator IC manufactured by Rohm Semiconductor, designed to deliver a fixed 8V output at 1A maximum current in a TO-220-3 package. This device provides positive fixed output regulation with integrated protection features including over-current, over-temperature, and over-voltage protection. The BA08ST is classified as "Not For New Designs," making identification of active equivalent parts essential for ongoing maintenance, repair, and legacy system support applications.

Substiute Parts

BA08ST

Rohm SemiconductorIn Stock: 1925BA08ST Datasheet

Current PartRFQ

LM2940T-8.0/NOPB

Texas InstrumentsIn Stock: 1087LM2940T-8.0/NOPB Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the BA08ST is determined by strict alignment of the following electrical and mechanical parameters:

• Fixed output voltage of 8V
• Output current capability of 1A minimum
• TO-220-3 package footprint compatibility
• Positive output configuration
• Through-hole mounting compatibility
• Integrated protection against over-current and over-temperature conditions

The LM2940T-8.0/NOPB from Texas Instruments meets all substitution criteria. Both devices share identical output voltage and current specifications, compatible package geometry, and equivalent protection feature sets. Mechanical and electrical pin compatibility is maintained across both parts.

Parameter Comparison

Engineering Selection Recommendations

The LM2940T-8.0/NOPB is a direct functional equivalent for BA08ST replacement applications. Both devices are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards. The LM2940T-8.0/NOPB carries Active product status, ensuring long-term availability and continued manufacturer support, whereas the BA08ST is designated Not For New Designs.

The LM2940T-8.0/NOPB provides an extended operating temperature range (-40°C to 125°C versus -40°C to 85°C), offering improved thermal performance margin in high-temperature environments. Maximum input voltage specification is marginally higher (26V versus 25V), providing additional input headroom. Both devices maintain identical pin configuration and TO-220-3 package geometry, enabling direct PCB-level substitution without layout modification.

Frequently Asked Questions (FAQ)

Q: Can the LM2940T-8.0/NOPB directly replace the BA08ST in existing designs?

A: Yes. Both devices share identical output voltage (8V), output current (1A), TO-220-3 package footprint, and pin configuration. Direct PCB substitution is mechanically and electrically compatible.

Q: What are the key differences between these two parts?

A: The LM2940T-8.0/NOPB offers Active product status (versus Not For New Designs), extended operating temperature range to 125°C, and marginally higher maximum input voltage (26V). Both provide equivalent protection features and regulatory compliance.

Q: Are there any thermal considerations when substituting?

A: The LM2940T-8.0/NOPB supports operation to 125°C, providing 40°C additional thermal margin compared to the BA08ST. Thermal management requirements remain equivalent for identical load conditions.

Q: Is packaging compatibility guaranteed?

A: Yes. Both devices use TO-220-3 through-hole packages with identical pin assignments and mechanical dimensions, ensuring direct board-level compatibility.

Q: Do both parts meet current regulatory requirements?

A: Yes. Both the BA08ST and LM2940T-8.0/NOPB are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards.