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BA78M05FP-E2 Equivalent & Substitute Parts
Part Overview
The BA78M05FP-E2 is a linear voltage regulator IC manufactured by Rohm Semiconductor, classified as a positive fixed output power management IC. This device delivers 500mA output current at a fixed 5V output with a maximum input voltage of 25V and typical dropout voltage of 2V at rated load. The part is in active product status with RoHS3 compliance and unlimited moisture sensitivity rating.
Substitute parts are identified when equivalent electrical performance can be maintained across critical parameters including output voltage, output current capability, input voltage rating, package compatibility, and thermal operating range. Substitution becomes necessary due to inventory availability, manufacturing lead times, or design optimization requirements.
Substiute Parts
Key Parameters
| Parameter | BA78M05FP-E2 |
|---|---|
| Manufacturer | Rohm Semiconductor |
| Output Voltage (Fixed) | 5V |
| Output Current | 500mA |
| Input Voltage (Max) | 25V |
| Dropout Voltage (Typ) | 2V @ 500mA |
| Quiescent Current | 6 mA |
| PSRR | 78dB (120Hz) |
| Protection Features | Over Current, Over Temperature |
| Operating Temperature | -40°C ~ 85°C |
| Package | TO-252-3 (DPAK) |
| RoHS Status | ROHS3 Compliant |
| MSL Rating | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitute parts are classified into two functional groups based on output current capability and electrical characteristics:
Group A - Direct Current Rating Match (500mA) Parts with 500mA output current matching the BA78M05FP-E2: L78M05ABDT-TR, L78M05ACDT-TR, MC78M05ABDTRKG, MC78M05ACDTRKG, and NCV78M05BDTRKG. These devices maintain identical output current specification and are suitable for direct replacement in applications requiring 500mA regulation.
Group B - Enhanced Current Rating (1A and 750mA) Parts with higher output current capability: AS7805ADTR-E1, AS7805ADTR-G1 (1A), and TL750M05CKVURG3 (750mA). These can substitute in applications where the BA78M05FP-E2 is used but higher current headroom is beneficial.
Group C - Reduced Current Rating (100mA) Parts with lower output current: LP2950CDT-5.0/NOPB and LP2950CDTX-5.0/NOPB (100mA). These are suitable only for applications with reduced current requirements below 500mA.
Substitution eligibility is determined by: fixed 5V output voltage, TO-252-3 package compatibility, positive output configuration, RoHS3 compliance, and operating temperature range overlap with the application requirement.
Parameter Comparison
| Part Number | Manufacturer | Output Current | Input Voltage (Max) | Dropout Voltage | Quiescent Current | PSRR (120Hz) | Operating Temp | Package | MSL |
|---|---|---|---|---|---|---|---|---|---|
| BA78M05FP-E2 | Rohm Semiconductor | 500mA | 25V | 2V @ 500mA | 6 mA | 78dB | -40°C ~ 85°C | TO-252-3 | 1 |
| AS7805ADTR-E1 | Diodes Incorporated | 1A | 25V | 2V @ 1A | 6 mA | 70dB | -40°C ~ 125°C | TO-252-3 | 3 |
| AS7805ADTR-G1 | Diodes Incorporated | 1A | 25V | 2V @ 1A | 6 mA | 70dB | -40°C ~ 125°C | TO-252-3 | 3 |
| L78M05ABDT-TR | STMicroelectronics | 500mA | 35V | Not specified | 6 mA | 62dB | -40°C ~ 125°C | TO-252-3 | 1 |
| L78M05ACDT-TR | STMicroelectronics | 500mA | 35V | Not specified | 6 mA | 62dB | 0°C ~ 125°C | TO-252-3 | 1 |
| LP2950CDT-5.0/NOPB | National Semiconductor | 100mA | 30V | 0.6V @ 100mA | 120 µA | Not specified | -40°C ~ 125°C | TO-252-3 | Not specified |
| LP2950CDTX-5.0/NOPB | National Semiconductor | 100mA | 30V | 0.6V @ 100mA | 120 µA | Not specified | -40°C ~ 125°C | TO-252-3 | Not specified |
| MC78M05ABDTRKG | onsemi | 500mA | 35V | Not specified | Not specified | 80dB | -40°C ~ 125°C | TO-252-3 | 1 |
| MC78M05ACDTRKG | onsemi | 500mA | 35V | Not specified | Not specified | 80dB | 0°C ~ 125°C | TO-252-3 | 1 |
| NCV78M05BDTRKG | onsemi | 500mA | 35V | Not specified | Not specified | 80dB | -40°C ~ 125°C | TO-252-3 | 1 |
| TL750M05CKVURG3 | Texas Instruments | 750mA | 26V | 0.6V @ 750mA | Not specified | 55dB | 0°C ~ 125°C | TO-252-3 | 3 |
Engineering Selection Recommendations
For applications requiring -40°C minimum operating temperature: L78M05ABDT-TR, MC78M05ABDTRKG, and NCV78M05BDTRKG maintain the full -40°C ~ 125°C temperature range. NCV78M05BDTRKG includes AEC-Q100 automotive qualification and is suitable for automotive-grade applications.
For applications with input voltages exceeding 25V: L78M05ABDT-TR, L78M05ACDT-TR, MC78M05ABDTRKG, MC78M05ACDTRKG, and NCV78M05BDTRKG support 35V maximum input voltage, providing additional design margin compared to the BA78M05FP-E2 at 25V.
For applications requiring enhanced current capacity: AS7805ADTR-E1 and AS7805ADTR-G1 provide 1A output current. TL750M05CKVURG3 provides 750mA with enhanced protection features including reverse polarity protection.
For low-power applications below 500mA: LP2950CDT-5.0/NOPB and LP2950CDTX-5.0/NOPB are suitable with 100mA output current and lower quiescent current (120 µA vs 6 mA), beneficial for battery-powered designs.
For standard 500mA applications: L78M05ABDT-TR and MC78M05ABDTRKG are direct functional equivalents with identical output current and RoHS3 compliance. Both maintain -40°C ~ 125°C operating range and TO-252-3 package compatibility.
Frequently Asked Questions (FAQ)
Q: Can AS7805ADTR-E1 or AS7805ADTR-G1 directly replace BA78M05FP-E2? A: Yes, functionally. Both devices provide 5V fixed output in TO-252-3 package with identical quiescent current and input voltage rating. The higher 1A output current provides additional design margin. Operating temperature range extends to 125°C. MSL rating differs (3 vs 1), requiring verification for moisture-sensitive applications.
Q: What is the difference between L78M05ABDT-TR and L78M05ACDT-TR? A: Both are STMicroelectronics 500mA regulators in TO-252-3 package with 35V input rating. L78M05ABDT-TR operates -40°C ~ 125°C; L78M05ACDT-TR operates 0°C ~ 125°C. Selection depends on minimum operating temperature requirement.
Q: Are LP2950 parts suitable replacements? A: LP2950CDT-5.0/NOPB and LP2950CDTX-5.0/NOPB are suitable only for applications requiring maximum 100mA output current. These micropower regulators feature lower quiescent current (120 µA) and lower dropout voltage (0.6V), making them optimal for low-power designs but unsuitable for 500mA load applications.
Q: What does NCV78M05BDTRKG automotive qualification mean? A: NCV78M05BDTRKG carries AEC-Q100 qualification, indicating compliance with automotive industry reliability standards. This part is suitable for automotive applications where BA78M05FP-E2 may not meet qualification requirements.
Q: Can I use TL750M05CKVURG3 in place of BA78M05FP-E2? A: Yes, with considerations. TL750M05CKVURG3 provides 750mA output (exceeding 500mA requirement) with enhanced protection including reverse polarity protection. Operating temperature range is 0°C ~ 125°C (not -40°C minimum). Input voltage maximum is 26V (vs 25V), providing minimal additional margin.
Q: Why do some parts show "Not specified" for dropout voltage? A: Dropout voltage is not provided in the technical data for certain parts. When substituting, contact the manufacturer for this specification if dropout voltage is critical to application performance.
Q: Are all substitute parts RoHS3 compliant? A: All listed substitute parts are RoHS3 compliant. MSL ratings vary; verify MSL requirements for your specific manufacturing process and storage conditions.
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