BA17809T Linear Voltage Regulator - Equivalent & Substitute Parts

Part Overview

The BA17809T is a linear voltage regulator IC manufactured by Rohm Semiconductor, designed for positive fixed 9V output applications with 1A current capacity. This through-hole component operates across a wide temperature range (-40°C to 85°C) and is actively produced. Alternative equivalent parts may be required due to inventory constraints, regional availability, or specific application requirements such as enhanced protection features or extended operating temperature ranges.

Substiute Parts

BA17809T

Rohm SemiconductorIn Stock: 3874BA17809T Datasheet

Current PartRFQ

LM2940T-9.0/NOPB

Texas InstrumentsIn Stock: 2085LM2940T-9.0/NOPB Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the BA17809T is determined by the following critical parameters:

• Fixed output voltage of 9V
• Output current rating of 1A minimum
• Maximum input voltage of 26V or greater
• TO-220-3 package configuration for through-hole mounting
• ROHS3 compliance and REACH unaffected status
• Active product status

The LM2940T-9.0/NOPB from Texas Instruments meets all substitution criteria. Both devices share identical output voltage, current rating, input voltage specification, and package type. Both are ROHS3 compliant and REACH unaffected, ensuring regulatory compatibility.

Parameter Comparison

Engineering Selection Recommendations

Both the BA17809T and LM2940T-9.0/NOPB are suitable for 9V/1A linear regulation applications with identical electrical specifications for output voltage, current capacity, and input voltage range. Selection between these devices should be based on the following factors:

The LM2940T-9.0/NOPB offers superior dropout voltage performance (1V versus 2V) and extended operating temperature range (-40°C to 125°C versus -85°C), making it suitable for applications requiring operation at elevated temperatures. The LM2940T-9.0/NOPB also includes integrated protection features for over-current, over-temperature, reverse polarity, and short-circuit conditions.

The BA17809T maintains lower quiescent current consumption (4.5 mA versus 10 mA), which may be advantageous in battery-powered or low-power standby applications.

Both devices are ROHS3 compliant and REACH unaffected, ensuring regulatory compliance for industrial and commercial applications. Both maintain active product status with established supply chains.

Frequently Asked Questions (FAQ)

Q: Can the LM2940T-9.0/NOPB directly replace the BA17809T in existing designs?

A: Yes. Both devices share identical output voltage (9V), output current (1A), input voltage specifications (26V max), and TO-220-3 package configuration. Pin-to-pin compatibility is maintained for through-hole mounting applications.

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

A: The LM2940T-9.0/NOPB provides lower dropout voltage (1V versus 2V), extended operating temperature range to 125°C, integrated protection features, and higher quiescent current (10 mA versus 4.5 mA). The BA17809T offers lower standby current consumption.

Q: Are both devices suitable for industrial temperature applications?

A: The LM2940T-9.0/NOPB operates to 125°C and is suitable for extended industrial temperature ranges. The BA17809T operates to 85°C, suitable for standard industrial applications.

Q: Do these devices require identical PCB layout and thermal management?

A: Both devices use the TO-220-3 package and require similar thermal management approaches. PCB layout considerations for input/output filtering and thermal dissipation remain consistent between devices.

Q: Are both devices available in the same packaging format?

A: Yes. Both the BA17809T and LM2940T-9.0/NOPB use TO-220-3 through-hole packaging, ensuring mechanical compatibility in existing PCB designs.