BA7818CP-E2 Equivalent & Substitute Parts

Part Overview

The BA7818CP-E2 is a linear voltage regulator IC manufactured by Rohm Semiconductor, designed to deliver a fixed positive 18V output at 1A maximum current in a TO-220-3 package configuration. This device functions as a positive fixed output regulator with integrated over-current and over-temperature protection features.

The BA7818CP-E2 is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or maintenance requirements for systems utilizing this regulator.

Substiute Parts

BA7818CP-E2

Rohm SemiconductorIn Stock: 1033BA7818CP-E2 Datasheet

Current PartRFQ

MC7818BTG

onsemiIn Stock: 17164MC7818BTG Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the BA7818CP-E2 are identified based on the following critical parameters that determine functional equivalence:

• Fixed output voltage of 18V
• Maximum output current of 1A
• Maximum input voltage rating of 33V or greater
• Voltage dropout specification of 2V or less at 1A
• Through-hole mounting in TO-220-3 package configuration
• Positive fixed output configuration with single regulator
• Over-temperature protection as minimum protection requirement
• ROHS3 compliance and REACH unaffected status

The MC7818BTG meets these substitution criteria and is classified as an active product with current manufacturing availability.

Parameter Comparison

Engineering Selection Recommendations

The MC7818BTG is a direct functional substitute for the BA7818CP-E2. Both devices meet the core electrical specifications for 18V fixed output regulation at 1A maximum current with identical dropout characteristics.

The MC7818BTG offers the following advantages: active product status with established supply chain availability (17,100 units in stock versus 945 units for the obsolete BA7818CP-E2), extended operating temperature range (-40°C to 125°C versus -40°C to 85°C), and higher maximum input voltage rating (35V versus 33V). Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements.

The MC7818BTG includes short-circuit protection in addition to over-temperature protection, providing enhanced circuit protection compared to the BA7818CP-E2. The PSRR specification of the BA7818CP-E2 (61dB at 120Hz) is marginally higher than the MC7818BTG (57dB at 120Hz), a difference of 4dB that is not significant for typical linear regulator applications.

Frequently Asked Questions (FAQ)

Q: Can the MC7818BTG directly replace the BA7818CP-E2 in existing designs?

A: Yes. Both devices deliver 18V fixed output at 1A maximum current with identical 2V dropout specifications. The TO-220-3 package pinout is compatible. The MC7818BTG's higher input voltage rating (35V versus 33V) and extended temperature range provide additional design margin.

Q: What is the difference in protection features between these parts?

A: The BA7818CP-E2 includes over-current and over-temperature protection. The MC7818BTG includes over-temperature and short-circuit protection. Both provide thermal shutdown capability. The short-circuit protection in the MC7818BTG offers additional safeguarding against output short conditions.

Q: Are there package compatibility concerns?

A: Both parts use TO-220-3 through-hole packages. The BA7818CP-E2 specifies cropped leads while the MC7818BTG uses standard TO-220 leads. Both configurations are mechanically compatible with standard TO-220-3 PCB footprints and mounting hardware.

Q: What is the significance of the PSRR difference?

A: The BA7818CP-E2 has 61dB PSRR at 120Hz while the MC7818BTG has 57dB. This 4dB difference represents approximately 60% higher noise rejection in the BA7818CP-E2. For most linear regulator applications, both values provide adequate power supply rejection. Applications requiring maximum noise rejection should evaluate this specification against system requirements.

Q: Why is the BA7818CP-E2 obsolete?

A: The BA7818CP-E2 is classified as obsolete by Rohm Semiconductor. The MC7818BTG from onsemi is an active product with current manufacturing support and established supply availability, making it the recommended choice for new designs and ongoing production.