BA178M24FP-E2 Equivalent & Substitute Parts

Part Overview

The BA178M24FP-E2 is a linear voltage regulator IC manufactured by Rohm Semiconductor, designed to deliver a fixed positive 24V 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 identified when equivalent electrical specifications and mechanical compatibility are maintained across the same output voltage, current rating, and package form factor.

Key Parameters

Parameter	Value
Manufacturer Part Number	BA178M24FP-E2
Manufacturer	Rohm Semiconductor
Category	Power Management (PMIC)
Output Voltage (Fixed)	24V
Output Current	500mA
Input Voltage (Max)	33V
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
Product Status	Active
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the BA178M24FP-E2 are qualified based on the following criteria:

Fixed positive output voltage of 24V
Output current rating of 500mA
Identical package form factor: TO-252-3 DPAK (2 Leads + Tab)
Surface Mount configuration
Active product status
ROHS3 compliance

The three identified substitutes (L78M24ABDT-TR, L78M24ACDT-TR, L78M24CDT-TR) all meet these core electrical and mechanical requirements. Variations in input voltage maximum rating, quiescent current, PSRR, protection features, and operating temperature ranges are secondary parameters that do not disqualify substitution eligibility but must be evaluated for specific application requirements.

Parameter Comparison

Parameter	BA178M24FP-E2	L78M24ABDT-TR	L78M24ACDT-TR	L78M24CDT-TR
Manufacturer	Rohm Semiconductor	STMicroelectronics	STMicroelectronics	STMicroelectronics
Output Voltage (Fixed)	24V	24V	24V	24V
Output Current	500mA	500mA	500mA	500mA
Input Voltage (Max)	33V	40V	40V	40V
Quiescent Current (Iq)	4.5 mA	6 mA	6 mA	6 mA
PSRR (120Hz)	55dB	50dB	50dB	50dB
Protection Features	None specified	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit
Operating Temperature	-40°C ~ 85°C	-40°C ~ 125°C	0°C ~ 125°C	0°C ~ 125°C
Package / Case	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All three substitute parts maintain Active product status and ROHS3 compliance, ensuring long-term availability and regulatory alignment with the BA178M24FP-E2. The STMicroelectronics L78M24 series substitutes provide enhanced protection features (Over Current, Over Temperature, Short Circuit) not specified in the Rohm device, and support higher maximum input voltage (40V versus 33V). The L78M24ABDT-TR maintains the full operating temperature range of the original part (-40°C ~ 125°C), while L78M24ACDT-TR and L78M24CDT-TR operate from 0°C ~ 125°C. Selection should be based on application-specific temperature requirements and input voltage headroom constraints.

Frequently Asked Questions (FAQ)

Q: Can L78M24ABDT-TR, L78M24ACDT-TR, and L78M24CDT-TR be used interchangeably with BA178M24FP-E2?

A: Yes, all three parts are direct substitutes based on matching output voltage (24V), output current (500mA), and identical TO-252-3 DPAK package configuration. Electrical and mechanical compatibility is maintained across all four devices.

Q: What is the difference between the three STMicroelectronics substitutes?

A: The primary differences are packaging format and operating temperature range. L78M24ABDT-TR is supplied in Cut Tape & Digi-Reel format with -40°C ~ 125°C operating range. L78M24ACDT-TR is supplied in Tape & Reel format with 0°C ~ 125°C operating range. L78M24CDT-TR is supplied in Cut Tape & Digi-Reel format with 0°C ~ 125°C operating range. All three share identical electrical specifications.

Q: Does the higher input voltage maximum (40V) of the L78M24 series affect compatibility?

A: No. The higher 40V maximum input rating of the STMicroelectronics parts provides additional design margin and does not create incompatibility. Applications designed for the BA178M24FP-E2 (33V max input) will operate within the safe operating area of the substitute parts.

Q: Are the protection features on the L78M24 series critical for substitution?

A: The Over Current, Over Temperature, and Short Circuit protection features on the STMicroelectronics parts are additional safeguards not specified in the Rohm device. These features enhance circuit robustness but do not prevent functional substitution in applications where the original part was used without explicit protection requirements.

Q: What packaging considerations apply when selecting a substitute?

A: All four parts use identical TO-252-3 DPAK package with the same PCB footprint and lead configuration. Packaging format differences (Tape & Reel versus Cut Tape & Digi-Reel) affect supply chain logistics and tape reel specifications but do not impact electrical or mechanical compatibility on the circuit board.

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