BA12T Linear Voltage Regulator IC - Equivalent & Substitute Parts

Part Overview

The BA12T is a linear voltage regulator IC manufactured by Rohm Semiconductor, designed for positive fixed 12V output applications with 1A current capacity. This through-hole TO-220-3 package component is classified as active product status and provides essential voltage regulation functionality in power management circuits. Substitute parts are identified when equivalent electrical performance, output specifications, and mechanical compatibility are maintained within the allowed parameter tolerances for this product category.

Key Parameters

Parameter	BA12T (Rohm)
Manufacturer	Rohm Semiconductor
Output Voltage (Fixed)	12V
Output Current	1A
Input Voltage (Max)	25V
Package Type	TO-220-3
Mounting Type	Through Hole
Operating Temperature Range	-40°C ~ 85°C
Protection Features	Over Current, Over Temperature, Over Voltage
Product Status	Active
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the BA12T are identified based on the following critical parameters that determine functional equivalence:

Fixed output voltage of 12V
Output current rating of 1A minimum
TO-220-3 package configuration for mechanical compatibility
Through-hole mounting type
Active product status
ROHS3 compliance for regulatory alignment
Protection features including over current and over temperature protection

The LM2940T-12.0/NOPB from Texas Instruments meets these substitution criteria with compatible electrical specifications and identical mechanical packaging.

Parameter Comparison

Parameter	BA12T (Rohm)	LM2940T-12.0/NOPB (Texas Instruments)
Output Voltage (Fixed)	12V	12V
Output Current	1A	1A
Input Voltage (Max)	25V	26V
Quiescent Current (Iq)	2.5 mA	10 mA
Voltage Dropout (Max)	Not specified	1V @ 1A
PSRR (120Hz)	55dB	66dB
Operating Temperature Range	-40°C ~ 85°C	-40°C ~ 125°C
Package Type	TO-220-3	TO-220-3
Protection Features	Over Current, Over Temperature, Over Voltage	Over Current, Over Temperature, Reverse Polarity, Short Circuit
Product Status	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Both the BA12T and LM2940T-12.0/NOPB are active products with ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements. The LM2940T-12.0/NOPB provides an extended operating temperature range (-40°C ~ 125°C versus -40°C ~ 85°C) and includes additional protection features for reverse polarity and short circuit conditions. Selection between these parts should be based on specific application temperature requirements and the necessity of extended protection features.

Frequently Asked Questions (FAQ)

Q: Can the LM2940T-12.0/NOPB directly replace the BA12T in existing designs?

A: Yes, both parts share identical 12V fixed output voltage, 1A output current rating, and TO-220-3 package configuration. Pin-to-pin compatibility is maintained for through-hole PCB applications.

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

A: The LM2940T-12.0/NOPB operates across a wider temperature range (-40°C ~ 125°C) compared to the BA12T (-40°C ~ 85°C), includes reverse polarity and short circuit protection, and has a specified 1V dropout voltage at 1A. The BA12T has lower quiescent current consumption at 2.5 mA versus 10 mA.

Q: Are both parts suitable for high-temperature applications?

A: The LM2940T-12.0/NOPB is rated to 125°C, making it suitable for elevated temperature environments. The BA12T is rated to 85°C and should be selected for applications within this temperature constraint.

Q: Do packaging differences affect PCB layout?

A: Both parts use identical TO-220-3 through-hole packaging. PCB footprints, lead spacing, and mounting hole requirements are equivalent.

Q: What compliance certifications apply to both parts?

A: Both the BA12T and LM2940T-12.0/NOPB are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards.

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