BA040LBSG2-TR Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The BA040LBSG2-TR is a linear voltage regulator IC manufactured by Rohm Semiconductor, designed to deliver a fixed 4V output at 150mA with low dropout voltage of 0.15V @ 50mA. This device features integrated over-current and over-temperature protection with enable control functionality. The part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain compatibility with the 4V fixed output specification, surface mount packaging requirements, and protection feature set while accommodating variations in output current capacity and input voltage ratings.

Key Parameters

Parameter	BA040LBSG2-TR
Manufacturer	Rohm Semiconductor
Output Voltage (Fixed)	4V
Output Current	150mA
Input Voltage (Max)	7V
Dropout Voltage (Max)	0.15V @ 50mA
Quiescent Current	15 µA
Operating Temperature Range	-40°C ~ 85°C
Package Type	SC-74A, SOT-753 (SMP5)
Control Features	Enable
Protection Features	Over Current, Over Temperature
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the BA040LBSG2-TR are selected based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

Fixed output voltage of 4V or 4.2V (acceptable tolerance for 4V applications)
Output current capacity of 50mA or greater (minimum 50mA for reduced-load applications; 100mA and 150mA for full-load compatibility)
Input voltage rating of 6V or greater (accommodates the original 7V maximum)
Surface mount packaging (SOT-23-5 or equivalent)
Enable control functionality
Over-current and over-temperature protection
ROHS3 compliance and REACH unaffected status

Grouping Logic:

Group 1 (50mA Output): TC1014-4.0VCT713 - suitable for reduced-load applications
Group 2 (100mA Output): TC1015-4.0VCT713 - intermediate current capacity
Group 3 (150mA Output): TC1185-4.0VCT713 - direct current capacity match
Group 4 (200mA Output): TPS79942DDCR, TPS79942DDCT - enhanced current capacity with extended protection features

All substitute parts are manufactured by Microchip Technology or Texas Instruments and maintain active product status, ensuring long-term availability and supply chain stability.

Parameter Comparison

Parameter	BA040LBSG2-TR	TC1014-4.0VCT713	TC1015-4.0VCT713	TC1185-4.0VCT713	TPS79942DDCR	TPS79942DDCT
Manufacturer	Rohm Semiconductor	Microchip Technology	Microchip Technology	Microchip Technology	Texas Instruments	Texas Instruments
Output Voltage (Fixed)	4V	4V	4V	4V	4.2V	4.2V
Output Current	150mA	50mA	100mA	150mA	200mA	200mA
Input Voltage (Max)	7V	6V	6V	6V	6.5V	6.5V
Dropout Voltage (Max)	0.15V @ 50mA	0.12V @ 50mA	0.25V @ 100mA	0.4V @ 150mA	0.16V @ 200mA	0.16V @ 200mA
Quiescent Current	15 µA	80 µA	80 µA	80 µA	60 µA	60 µA
Operating Temperature Range	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Package Type	SC-74A, SOT-753	SC-74A, SOT-753	SC-74A, SOT-753	SC-74A, SOT-753	SOT-23-5 Thin, TSOT-23-5	SOT-23-5 Thin, TSOT-23-5
Control Features	Enable	Enable	Enable	Enable	Enable	Enable
Protection Features	Over Current, Over Temperature	Over Current, Over Temperature	Over Current, Over Temperature	Over Current, Over Temperature	Over Current, Over Temperature, Reverse Polarity, UVLO	Over Current, Over Temperature, Reverse Polarity, UVLO
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

TC1014-4.0VCT713 Selection Criteria: Select this 50mA substitute when circuit load requirements do not exceed 50mA. This part maintains 4V fixed output voltage and active product status. Operating temperature range extends to 125°C, providing thermal margin beyond the original BA040LBSG2-TR specification. ROHS3 compliance and REACH unaffected status ensure regulatory alignment.

TC1015-4.0VCT713 Selection Criteria: Select this 100mA substitute for applications requiring intermediate current capacity between 50mA and 150mA. Fixed 4V output voltage matches the original specification. Active product status and extended temperature range to 125°C support long-term production. ROHS3 compliance maintained.

TC1185-4.0VCT713 Selection Criteria: Select this 150mA substitute for direct current capacity replacement of the BA040LBSG2-TR. Maintains 4V fixed output voltage and 150mA output current specification. Active product status ensures supply chain continuity. Extended operating temperature range to 125°C and ROHS3 compliance provide design flexibility and regulatory compliance.

TPS79942DDCR and TPS79942DDCT Selection Criteria: Select these 200mA substitutes when enhanced current capacity and extended protection features are required. Output voltage is 4.2V, acceptable for 4V-specified applications. Both parts feature reverse polarity protection and under-voltage lockout (UVLO) in addition to over-current and over-temperature protection. Active product status and ROHS3 compliance confirmed. TPS79942DDCR is supplied in cut tape packaging; TPS79942DDCT is supplied in tape and reel packaging. Select based on procurement and assembly requirements.

Frequently Asked Questions (FAQ)

Q: Can TC1014-4.0VCT713 replace BA040LBSG2-TR in all applications? A: TC1014-4.0VCT713 is suitable only for applications where output current does not exceed 50mA. If the circuit requires 150mA output current, this substitute is not appropriate. For full 150mA capacity, select TC1185-4.0VCT713.

Q: What is the difference between TPS79942DDCR and TPS79942DDCT? A: Both parts are electrically identical with 4.2V output and 200mA current capacity. The difference is packaging: TPS79942DDCR is supplied in cut tape format, while TPS79942DDCT is supplied in tape and reel format. Select based on your assembly process requirements.

Q: Is the 4.2V output of TPS79942 compatible with a 4V specification? A: The 4.2V output is within acceptable tolerance for most 4V applications. However, verify that your circuit design and downstream components can tolerate the 0.2V higher output voltage before implementation.

Q: Why do Microchip substitutes have higher quiescent current than the original BA040LBSG2-TR? A: Microchip TC1014, TC1015, and TC1185 devices specify 80 µA quiescent current compared to 15 µA for the BA040LBSG2-TR. This difference reflects different IC design architectures. For battery-powered or ultra-low-power applications, evaluate the impact of this 65 µA increase on system power consumption.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All substitute parts listed (TC1014-4.0VCT713, TC1015-4.0VCT713, TC1185-4.0VCT713, TPS79942DDCR, and TPS79942DDCT) are ROHS3 compliant and REACH unaffected, matching the regulatory status of the original BA040LBSG2-TR.

Q: Can I use a higher-current substitute in place of the BA040LBSG2-TR? A: Yes. Higher-current substitutes such as TC1185-4.0VCT713 (150mA) or TPS79942DDCR/DDCT (200mA) are backward compatible with lower-current applications. The regulator will supply only the current demanded by the load circuit. Verify that input voltage ratings and package dimensions are compatible with your PCB layout.

Q: What is the operating temperature difference between BA040LBSG2-TR and its substitutes? A: The original BA040LBSG2-TR operates from -40°C to 85°C. All active substitutes extend the upper temperature limit to 125°C. If your application operates above 85°C, substitutes provide additional thermal margin. If your application is limited to 85°C or below, both the original and substitute specifications are acceptable.

Q: Do the substitute parts require different PCB layout or circuit design changes? A: All substitute parts maintain the same functional pinout and control features (Enable, Over-Current, Over-Temperature protection). PCB layout should follow the regulator manufacturer's datasheet recommendations for decoupling capacitors and trace routing. No circuit topology changes are required for functional substitution.

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