BA178M06FP-E2 Equivalent & Substitute Parts

Part Overview

The BA178M06FP-E2 is a linear voltage regulator IC manufactured by Rohm Semiconductor, designed to deliver a fixed 6V output at 500mA maximum current. This positive fixed output regulator operates across an input voltage range up to 21V and is housed in a TO-252-3 (DPAK) surface mount package. The device is currently in active production status with substantial inventory availability (16,731 pcs in stock).

Finding equivalent and substitute parts becomes necessary when the primary part reaches end-of-life status, experiences supply constraints, or when design requirements necessitate alternative performance characteristics such as higher input voltage tolerance, enhanced thermal performance, or extended operating temperature ranges.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	6V
Output Current	500mA
Input Voltage (Max)	21V
Voltage Dropout (Max)	2V @ 500mA (Typ)
Quiescent Current	4.5 mA
PSRR	74dB (120Hz)
Operating Temperature Range	-40°C ~ 85°C
Package	TO-252-3 (DPAK)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the BA178M06FP-E2 is determined by the following critical parameters:

Fixed output voltage of 6V
Minimum output current capability of 500mA
Surface mount DPAK (TO-252-3) package compatibility
Input voltage tolerance sufficient for the application (minimum 21V max input)
Operating temperature range compatibility with system requirements
RoHS3 compliance and REACH unaffected status

The identified substitute parts meet these core electrical and mechanical requirements while offering variations in input voltage rating, quiescent current, PSRR performance, and operating temperature ranges. These variations allow designers to select alternatives based on specific application constraints without compromising the fundamental voltage regulation function.

Parameter Comparison

Parameter	BA178M06FP-E2 (Rohm)	L78M06ABDT-TR (STMicroelectronics)	UA78M06CKVURG3 (Texas Instruments)
Output Voltage	6V	6V	6V
Output Current	500mA	500mA	500mA
Input Voltage (Max)	21V	35V	25V
Voltage Dropout (Max)	2V @ 500mA	Not specified	2V @ 350mA
Quiescent Current	4.5 mA	6 mA	Not specified
PSRR	74dB (120Hz)	59dB (120Hz)	80dB (120Hz)
Operating Temperature	-40°C ~ 85°C	-40°C ~ 125°C	0°C ~ 125°C
Package	TO-252-3 (DPAK)	TO-252-3 (DPAK)	TO-252-3 (DPAK)
Protection Features	None 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

L78M06ABDT-TR (STMicroelectronics) is suitable for applications requiring higher input voltage tolerance (35V maximum) compared to the BA178M06FP-E2 (21V maximum). This part maintains active production status and includes integrated protection features for over-current, over-temperature, and short-circuit conditions. The extended operating temperature range (-40°C ~ 125°C) accommodates wider thermal environments. Quiescent current is slightly elevated at 6 mA versus 4.5 mA on the primary part.

UA78M06CKVURG3 (Texas Instruments) offers superior PSRR performance at 80dB (120Hz) compared to the BA178M06FP-E2 at 74dB, making it advantageous for noise-sensitive applications. This part includes integrated protection features and operates across -40°C ~ 125°C. However, this part carries a Last Time Buy status, indicating limited future availability. The operating temperature lower limit begins at 0°C rather than -40°C, which may restrict use in extreme cold environments.

Selection between substitutes should prioritize application-specific requirements: input voltage range, noise performance, thermal operating range, and long-term supply availability.

Frequently Asked Questions (FAQ)

Q: Can the L78M06ABDT-TR replace the BA178M06FP-E2 in all applications?

A: The L78M06ABDT-TR is electrically compatible for applications where the input voltage does not exceed 21V. The higher 35V input rating provides additional design margin. Both parts deliver 6V at 500mA in identical DPAK packages. Verify that the slightly higher quiescent current (6 mA vs 4.5 mA) does not impact battery-powered or low-power standby applications.

Q: What is the significance of the UA78M06CKVURG3 Last Time Buy status?

A: Last Time Buy status indicates that Texas Instruments has announced end-of-life for this part. New orders may still be accepted for a limited period, but long-term availability cannot be guaranteed. For new designs or long-term production requirements, the BA178M06FP-E2 or L78M06ABDT-TR are preferred due to active production status.

Q: Are all three parts pin-compatible?

A: Yes. All three parts use the TO-252-3 (DPAK) package with identical pinout: input, ground, and output. Direct PCB footprint compatibility is confirmed.

Q: Which substitute offers the best noise performance?

A: The UA78M06CKVURG3 provides the highest PSRR at 80dB (120Hz), compared to 74dB for the BA178M06FP-E2 and 59dB for the L78M06ABDT-TR. Select the UA78M06CKVURG3 for applications requiring superior power supply rejection ratio performance.

Q: Do all parts include protection features?

A: The BA178M06FP-E2 does not specify integrated protection features. Both L78M06ABDT-TR and UA78M06CKVURG3 include over-current, over-temperature, and short-circuit protection, providing enhanced reliability in fault conditions.

Q: What is the temperature range limitation for the UA78M06CKVURG3?

A: The UA78M06CKVURG3 operates from 0°C to 125°C, whereas the BA178M06FP-E2 operates from -40°C to 85°C. Applications requiring operation below 0°C must use the BA178M06FP-E2 or L78M06ABDT-TR.

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