BA17812T Linear Voltage Regulator - Equivalent & Substitute Parts

Part Overview

The BA17812T is a linear voltage regulator IC manufactured by Rohm Semiconductor, designed to provide a fixed 12V positive 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 This device is classified as Not For New Designs, indicating it has been superseded in Rohm's product portfolio.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 this regulator is currently deployed.

Substiute Parts

BA17812T

Rohm SemiconductorIn Stock: 2745BA17812T Datasheet

Current PartRFQ

LM2940T-12.0/NOPB

Texas InstrumentsIn Stock: 6690LM2940T-12.0/NOPB Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BA17812T is determined by the following critical parameters:

• Fixed Output Voltage: 12V (non-adjustable)
• Output Current Rating: 1A minimum
• Package Type: TO-220-3 (mechanical and thermal compatibility)
• Input Voltage Range: Maximum 26V or higher
• Voltage Dropout: Acceptable at or below 2V @ 1A for circuit operation
• Operating Temperature: Minimum -40°C to 85°C coverage
• Regulatory Compliance: ROHS3 compliance required

The LM2940T-12.0/NOPB from Texas Instruments meets all substitution criteria. Both devices provide identical fixed 12V output, 1A current capacity, and TO-220-3 packaging. Electrical parameters remain within acceptable tolerances for direct replacement in existing circuit designs.

Parameter Comparison

Engineering Selection Recommendations

The LM2940T-12.0/NOPB is a direct functional equivalent for BA17812T replacement applications. Both devices are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements.

The LM2940T-12.0/NOPB offers superior performance characteristics: lower dropout voltage (1V vs 2V), extended operating temperature range (-40°C to 125°C vs -40°C to 85°C), and integrated protection features (over current, over temperature, reverse polarity, and short circuit protection). The LM2940T-12.0/NOPB maintains Active product status, ensuring continued availability and manufacturing support.

The BA17812T Not For New Designs status indicates Rohm has discontinued active development. For new circuit designs, the LM2940T-12.0/NOPB is the recommended selection. For legacy system maintenance where BA17812T components are currently installed, the LM2940T-12.0/NOPB provides direct pin-compatible replacement with enhanced reliability.

Frequently Asked Questions (FAQ)

Q: Can the LM2940T-12.0/NOPB directly replace the BA17812T in existing circuits?

A: Yes. Both devices share identical pinout (TO-220-3), fixed 12V output voltage, and 1A current rating. No circuit modifications are required for direct substitution.

Q: What are the key differences between these regulators?

A: The LM2940T-12.0/NOPB features lower dropout voltage (1V vs 2V), higher maximum operating temperature (125°C vs 85°C), and integrated protection circuits. Input voltage maximum is 26V (LM2940T) versus 27V (BA17812T), a negligible difference for most applications.

Q: Why does the LM2940T-12.0/NOPB have higher quiescent current?

A: The 10 mA quiescent current of the LM2940T-12.0/NOPB reflects integrated protection circuitry. For applications where quiescent current is critical, verify the 5.5 mA difference against system power budget requirements.

Q: Are both devices suitable for industrial temperature applications?

A: The BA17812T operates -40°C to 85°C. The LM2940T-12.0/NOPB extends to -40°C to 125°C, providing broader industrial temperature coverage. Select based on specific application temperature requirements.

Q: What is the significance of the protection features in the LM2940T-12.0/NOPB?

A: Integrated over current, over temperature, reverse polarity, and short circuit protection enhance circuit reliability and fault tolerance. These features are absent in the BA17812T, making the LM2940T-12.0/NOPB more robust for demanding applications.

Q: Are both parts RoHS compliant?

A: Yes. Both BA17812T and LM2940T-12.0/NOPB are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards.