BA09T Linear Voltage Regulator - Equivalent & Substitute Parts

Part Overview

The BA09T is a linear voltage regulator IC manufactured by ROHM Semiconductor, designed to deliver a fixed 9V output at 1A current capacity in a TO-220-3 through-hole package. This device is classified as Not For New Designs, indicating it has been superseded in ROHM's product portfolio.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 applications requiring continued support, legacy system maintenance, or when the primary part becomes unavailable.

Key Parameters

Parameter	BA09T
Manufacturer	ROHM Semiconductor
Output Voltage (Fixed)	9V
Output Current	1A
Input Voltage (Max)	25V
Mounting Type	Through Hole
Package	TO-220-3
Operating Temperature Range	-40°C to 85°C
Protection Features	Over Current, Over Temperature, Over Voltage
RoHS Status	ROHS3 Compliant
Product Status	Not For New Designs

Substitute Part Grouping Explanation

Substitute parts for the BA09T are identified based on the following critical parameters that determine functional compatibility:

Fixed output voltage of 9V
Output current capability of 1A or greater
Input voltage rating of 25V or higher
Through-hole or surface-mount packaging options
RoHS3 compliance
Operating temperature range spanning -40°C minimum

Two substitute categories are available:

Parametric Equivalent (Same Mounting Type): LM2940T-9.0/NOPB maintains the through-hole TO-220-3 package format, enabling direct board-level replacement without layout modification.

Functional Substitute (Enhanced Specifications): BD90FD0WHFP-TR provides higher output current (2A) and improved input voltage rating (32V) in a surface-mount HRP-5 package, requiring PCB redesign but offering superior performance margins.

Parameter Comparison

Parameter	BA09T	LM2940T-9.0/NOPB	BD90FD0WHFP-TR
Manufacturer	ROHM Semiconductor	Texas Instruments	ROHM Semiconductor
Output Voltage (Fixed)	9V	9V	9V
Output Current	1A	1A	2A
Input Voltage (Max)	25V	26V	32V
Quiescent Current (Iq)	2.5 mA	10 mA	1 mA
PSRR @ 120Hz	55dB	64dB	50dB
Mounting Type	Through Hole	Through Hole	Surface Mount
Package	TO-220-3	TO-220-3	HRP-5
Operating Temperature Range	-40°C to 85°C	-40°C to 125°C	-40°C to 105°C
Protection Features	Over Current, Over Temperature, Over Voltage	Over Current, Over Temperature, Reverse Polarity, Short Circuit	Over Current, Over Temperature, Short Circuit
Product Status	Not For New Designs	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (No PCB Modification): Select LM2940T-9.0/NOPB. This part maintains identical through-hole TO-220-3 packaging and equivalent 1A output current specification. The LM2940T-9.0/NOPB is manufactured by Texas Instruments with Active product status, ensuring long-term availability and support. All three parts meet ROHS3 compliance requirements.

For Performance Enhancement (PCB Redesign Required): Select BD90FD0WHFP-TR when design constraints permit surface-mount implementation. This part delivers doubled output current capacity (2A), higher input voltage tolerance (32V), and lower quiescent current (1 mA), providing improved efficiency and thermal performance. The BD90FD0WHFP-TR maintains ROHM Semiconductor manufacturing with Active product status.

Availability Consideration: Both substitute parts carry Active product status, indicating current production and long-term supply availability, contrasting with the BA09T's Not For New Designs classification.

Frequently Asked Questions (FAQ)

Q: Can LM2940T-9.0/NOPB replace BA09T without PCB changes? A: Yes. Both parts use TO-220-3 through-hole packaging with identical pin configuration and 1A output current rating. No board layout modification is required for direct substitution.

Q: What are the key differences between LM2940T-9.0/NOPB and BA09T? A: The LM2940T-9.0/NOPB offers extended operating temperature range (-40°C to 125°C versus -40°C to 85°C), higher PSRR (64dB versus 55dB), and additional reverse polarity protection. Quiescent current is higher at 10 mA compared to 2.5 mA.

Q: When should BD90FD0WHFP-TR be selected over LM2940T-9.0/NOPB? A: Select BD90FD0WHFP-TR when the application requires 2A output current, higher input voltage margin (32V), or lower quiescent current consumption. This part requires PCB redesign due to surface-mount HRP-5 packaging.

Q: Are all three parts RoHS compliant? A: Yes. BA09T, LM2940T-9.0/NOPB, and BD90FD0WHFP-TR are all ROHS3 compliant.

Q: What is the significance of BA09T being "Not For New Designs"? A: This classification indicates ROHM Semiconductor has discontinued active development and recommends alternative parts for new applications. Existing inventory remains available, but long-term supply cannot be guaranteed.

Q: Can BD90FD0WHFP-TR be used in applications designed for 1A output? A: Yes. The BD90FD0WHFP-TR 2A rating exceeds the 1A requirement, providing design margin. However, thermal management and PCB layout must accommodate surface-mount HRP-5 packaging.

Q: What protection features differ between these parts? A: BA09T includes over voltage protection. LM2940T-9.0/NOPB adds reverse polarity protection. BD90FD0WHFP-TR includes short circuit protection. All three provide over current and over temperature protection.

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