BA178M08FP-E2 Equivalent & Substitute Parts

Part Overview

The BA178M08FP-E2 is a linear voltage regulator IC manufactured by Rohm Semiconductor, designed to deliver a fixed positive 8V output at 500mA. This Surface Mount device in TO-252-3 (DPAK) packaging is classified as Active product status and is RoHS3 compliant. Substitute parts are necessary when the primary part becomes unavailable, when alternative sourcing reduces lead times, or when design flexibility requires selection from multiple qualified manufacturers while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Manufacturer	Rohm Semiconductor
Part Number	BA178M08FP-E2
Category	Power Management (PMIC)
Output Voltage (Fixed)	8V
Output Current	500mA
Input Voltage (Max)	23V
Voltage Dropout (Max)	2V @ 500mA (Typ)
Package / Case	TO-252-3, DPAK (2 Leads + Tab), SC-63
Mounting Type	Surface Mount
Operating Temperature	-40°C ~ 85°C
RoHS Status	RoHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitution eligibility for the BA178M08FP-E2 is determined by the following critical parameters:

Fixed output voltage of 8V
Output current rating of 500mA minimum
TO-252-3 (DPAK) package compatibility
Surface Mount technology
RoHS3 compliance
Input voltage tolerance (minimum 23V maximum rating)
Operating temperature range overlap

The substitute parts L78M08ABDT-TR and UA78M08CKVURG3 meet these core electrical and mechanical requirements, enabling direct functional replacement in applications where the BA178M08FP-E2 is specified.

Parameter Comparison

Parameter	BA178M08FP-E2 (Rohm)	L78M08ABDT-TR (STMicroelectronics)	UA78M08CKVURG3 (Texas Instruments)
Output Voltage (Fixed)	8V	8V	8V
Output Current	500mA	500mA	500mA
Input Voltage (Max)	23V	35V	25V
Voltage Dropout (Max)	2V @ 500mA (Typ)	Not specified	2V @ 350mA
Quiescent Current (Iq)	4.5 mA	6 mA	Not specified
PSRR (120Hz)	69dB	56dB	80dB
Package / Case	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK
Operating Temperature	-40°C ~ 85°C	-40°C ~ 125°C	0°C ~ 125°C
Protection Features	Not specified	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit
RoHS Status	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant
Product Status	Active	Active	Last Time Buy

Engineering Selection Recommendations

L78M08ABDT-TR (STMicroelectronics): This substitute maintains Active product status and offers extended input voltage tolerance (35V maximum) compared to the BA178M08FP-E2 (23V maximum). The device includes integrated protection features for Over Current, Over Temperature, and Short Circuit conditions. Operating temperature range extends to 125°C, providing broader thermal coverage. RoHS3 compliance and identical TO-252-3 packaging ensure direct mechanical compatibility.

UA78M08CKVURG3 (Texas Instruments): This substitute carries Last Time Buy product status, indicating limited future availability. The device provides superior PSRR performance (80dB at 120Hz) and integrated protection features. Operating temperature range extends to 125°C. However, the minimum operating temperature begins at 0°C rather than -40°C, which may restrict use in extended cold environments. Moisture Sensitivity Level (MSL) is rated at 3 (168 Hours), requiring controlled storage conditions compared to the BA178M08FP-E2 MSL-1 rating.

Selection between substitutes should prioritize L78M08ABDT-TR for new designs and long-term production due to Active status and broader electrical specifications. UA78M08CKVURG3 remains compatible but requires consideration of Last Time Buy status and MSL-3 storage requirements.

Frequently Asked Questions (FAQ)

Q: Can L78M08ABDT-TR directly replace BA178M08FP-E2 on existing PCBs?

A: Yes. Both devices use identical TO-252-3 (DPAK) packaging with the same pinout and lead configuration. No PCB modifications are required for mechanical or electrical interface compatibility.

Q: What is the significance of the 35V input voltage rating on L78M08ABDT-TR versus 23V on BA178M08FP-E2?

A: The L78M08ABDT-TR accepts higher input voltages, providing design flexibility for applications with variable supply sources. The BA178M08FP-E2 is limited to 23V maximum input. Both devices deliver identical 8V fixed output and are suitable for applications within the BA178M08FP-E2's 23V input specification.

Q: Why is UA78M08CKVURG3 marked as Last Time Buy?

A: Last Time Buy status indicates Texas Instruments has announced end-of-life for this product. Existing inventory remains available, but future production is not planned. This status does not affect electrical performance but impacts long-term supply chain planning.

Q: What does MSL-3 (168 Hours) on UA78M08CKVURG3 mean compared to MSL-1 on BA178M08FP-E2?

A: Moisture Sensitivity Level (MSL) defines storage and handling requirements. MSL-1 (Unlimited) allows indefinite storage without moisture control. MSL-3 (168 Hours) requires the device to be used within 168 hours of package opening in standard humidity conditions, or stored in controlled dry environments. This affects inventory management and handling procedures.

Q: Are all three devices RoHS3 compliant?

A: Yes. BA178M08FP-E2, L78M08ABDT-TR, and UA78M08CKVURG3 are all RoHS3 compliant, meeting environmental and hazardous substance restrictions for EU and global markets.

Q: What protection features does the BA178M08FP-E2 include?

A: Protection features are not specified in the BA178M08FP-E2 datasheet parameters. L78M08ABDT-TR and UA78M08CKVURG3 both include Over Current, Over Temperature, and Short Circuit protection, providing additional circuit safeguards.

Q: Can UA78M08CKVURG3 be used in applications requiring -40°C operation?

A: No. UA78M08CKVURG3 operates from 0°C to 125°C, excluding the -40°C lower limit of BA178M08FP-E2. Applications requiring -40°C operation must use BA178M08FP-E2 or L78M08ABDT-TR.

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