BA05ST Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The BA05ST is a linear voltage regulator IC manufactured by Rohm Semiconductor, designed for positive fixed 5V output at 1A current capacity in a TO-220-5 package. This device provides regulated power supply functionality with integrated protection features including over-current, over-temperature, and over-voltage protection.

The BA05ST carries a "Not For New Designs" product status, indicating that Rohm Semiconductor has discontinued active development for this component. Organizations requiring this functionality for new or ongoing applications must evaluate qualified substitute parts that maintain electrical and mechanical compatibility within the specified parameter ranges.

Substiute Parts

BA05ST

Rohm SemiconductorIn Stock: 2649BA05ST Datasheet

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LM2941T/NOPB

Texas InstrumentsIn Stock: 2388LM2941T/NOPB Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the BA05ST must satisfy the following critical parameters to ensure functional and mechanical compatibility:

Electrical Compatibility Requirements:

• Output Configuration: Positive
• Number of Regulators: 1
• Current - Output: 1A minimum
• Voltage - Input (Max): 25V or greater
• Operating Temperature Range: Must encompass or exceed -40°C ~ 85°C
• Mounting Type: Through Hole
• Package / Case: TO-220-5 or equivalent pin-compatible variant

Regulatory & Compliance Requirements:

• RoHS3 Compliant
• REACH Unaffected status
• Active or equivalent product status preferred for new applications

The LM2941T/NOPB from Texas Instruments meets these substitution criteria. While the LM2941T/NOPB features adjustable output voltage capability (5V to 20V) compared to the BA05ST's fixed 5V output, it maintains full electrical and mechanical compatibility when configured for 5V fixed operation. The higher quiescent current (10 mA vs. 2.5 mA) and maximum supply current (15 mA vs. 5 mA) represent acceptable trade-offs for applications where the BA05ST is no longer available.

Parameter Comparison

Engineering Selection Recommendations

The LM2941T/NOPB qualifies as a direct substitute for the BA05ST based on the following engineering criteria:

Compliance & Regulatory Status: Both components maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for equivalent component selection.

Product Lifecycle: The LM2941T/NOPB carries Active product status, ensuring continued manufacturer support, availability, and technical documentation. This addresses the primary limitation of the BA05ST's "Not For New Designs" designation.

Electrical Performance: The LM2941T/NOPB delivers equivalent output current (1A) and fixed voltage capability (5V) when properly configured. The extended operating temperature range (-40°C ~ 125°C) provides additional thermal margin compared to the BA05ST (-40°C ~ 85°C).

Mechanical Compatibility: Both components utilize identical TO-220-5 through-hole packaging, enabling direct PCB footprint compatibility without layout modifications.

Trade-off Considerations: The LM2941T/NOPB exhibits higher quiescent and supply currents (10 mA and 15 mA respectively versus 2.5 mA and 5 mA). For power-sensitive applications, this increased standby consumption should be evaluated against the availability and lifecycle advantages of the substitute part.

Frequently Asked Questions (FAQ)

Q: Can the LM2941T/NOPB directly replace the BA05ST without circuit modifications?

A: The LM2941T/NOPB is pin-compatible and can occupy the same PCB footprint. However, the LM2941T/NOPB is an adjustable regulator requiring external resistive divider networks to set output voltage. To achieve 5V fixed output equivalent to the BA05ST, external resistors must be added to the feedback network. Consult the LM2941T/NOPB datasheet for specific resistor values and circuit configuration.

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

A: The primary difference is output voltage configuration. The BA05ST provides fixed 5V output internally, while the LM2941T/NOPB requires external resistor configuration to set output voltage. Both deliver 1A output current and accept input voltages up to 25-26V. The LM2941T/NOPB operates across a wider temperature range (-40°C to 125°C versus -40°C to 85°C) and exhibits higher quiescent current consumption.

Q: Are there packaging or pinout differences?

A: Both components use TO-220-5 through-hole packages with identical pin configurations. No PCB layout changes are required for mechanical compatibility.

Q: Why is the BA05ST marked "Not For New Designs"?

A: This designation indicates that Rohm Semiconductor has concluded active development and support for this component. Manufacturers typically apply this status when transitioning product lines or consolidating portfolios. The LM2941T/NOPB, with Active status, represents the current-generation equivalent offering from a major semiconductor manufacturer.

Q: What compliance certifications apply to both parts?

A: Both the BA05ST and LM2941T/NOPB are ROHS3 compliant and REACH unaffected, satisfying environmental and regulatory requirements for equivalent component selection in regulated markets.