BA178M24T Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The BA178M24T is a linear voltage regulator IC manufactured by Rohm Semiconductor, designed to deliver a fixed positive 24V output at 500mA in a TO-220-3 through-hole package. This component is classified as Not For New Designs, indicating it has been superseded in Rohm's product portfolio. Finding equivalent or substitute parts is necessary for maintenance applications, legacy system repairs, and inventory management where the original part may be unavailable or discontinued.

Substiute Parts

BA178M24T

Rohm SemiconductorIn Stock: 1179BA178M24T Datasheet

Current PartRFQ

BA178M24T

Rohm SemiconductorIn Stock: 1179BA178M24T Datasheet

Parametric EquivalentRFQ

L78M24CV

STMicroelectronicsIn Stock: 4660L78M24CV Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the BA178M24T is determined by the following critical parameters:

• Fixed output voltage of 24V
• Minimum output current capability of 500mA
• Through-hole TO-220 package family
• Maximum input voltage rating of 33V or higher
• Operating temperature range compatibility
• RoHS3 compliance

The L78M24CV from STMicroelectronics qualifies as a functional substitute based on matching output voltage (24V), output current (500mA), package type (TO-220), and regulatory compliance (ROHS3). Differences in input voltage rating, dropout voltage specification, and operating temperature range are noted but do not prevent substitution in applications where the BA178M24T specifications are met.

Parameter Comparison

Engineering Selection Recommendations

The L78M24CV is the primary substitute for the BA178M24T. Both parts deliver 24V at 500mA in compatible TO-220 packages and meet ROHS3 compliance requirements. The L78M24CV offers the advantage of Active product status, indicating ongoing manufacturer support and availability. The higher maximum input voltage rating (40V vs. 33V) and extended operating temperature range (0°C ~ 125°C vs. -40°C ~ 85°C) of the L78M24CV provide additional design margin in applications where the BA178M24T was previously specified. The inclusion of integrated protection features (Over Current, Over Temperature, Short Circuit) in the L78M24CV enhances circuit reliability compared to the BA178M24T.

Frequently Asked Questions (FAQ)

Q: Can the L78M24CV directly replace the BA178M24T without PCB modifications?

A: Yes. Both parts use the TO-220-3 package with identical pin configurations and through-hole mounting. No PCB layout changes are required for mechanical or electrical compatibility.

Q: What are the key differences between these parts?

A: The L78M24CV has a higher maximum input voltage (40V vs. 33V), wider operating temperature range (0°C ~ 125°C vs. -40°C ~ 85°C), integrated protection features, and Active product status. Output voltage and current ratings are identical.

Q: Is the L78M24CV suitable for applications requiring the -40°C ~ 85°C temperature range of the BA178M24T?

A: The L78M24CV operates from 0°C ~ 125°C. Applications requiring operation below 0°C must verify that the L78M24CV meets their minimum temperature requirement, or alternative parts must be sourced.

Q: Are there packaging differences between BA178M24T and L78M24CV?

A: The BA178M24T is supplied in Bulk packaging, while the L78M24CV is supplied in Tube packaging. Both use the TO-220-3 package type. Packaging format does not affect electrical performance or PCB compatibility.

Q: What is the significance of the BA178M24T being marked "Not For New Designs"?

A: This designation indicates the part is obsolete or superseded in Rohm's product line. The L78M24CV, with Active status, is the recommended alternative for new applications and ongoing production.