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BD3951F-E2 Equivalent & Substitute Parts
Part Overview
The BD3951F-E2 is a linear voltage regulator IC from Rohm Semiconductor designed for positive fixed 5V output applications with 150mA current capacity. This device is classified as Not For New Designs, indicating it has been superseded in Rohm's product portfolio. Finding equivalent or substitute parts is necessary for ongoing production support, legacy system maintenance, and design flexibility when the primary part becomes unavailable or when higher performance specifications are required.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | BD3951F-E2 |
| Manufacturer | Rohm Semiconductor |
| Category | Power Management (PMIC) |
| Output Configuration | Positive |
| Output Type | Fixed |
| Voltage - Output (Fixed) | 5V |
| Voltage - Input (Max) | 20V |
| Current - Output | 150mA |
| Voltage Dropout (Max) | 0.5V @ 100mA |
| Operating Temperature Range | -40°C ~ 125°C |
| Package / Case | 8-SOIC (0.173", 4.40mm Width) |
| Mounting Type | Surface Mount |
| Protection Features | Over Current, Over Temperature |
| Product Status | Not For New Designs |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution of the BD3951F-E2 is determined by the following critical parameters:
- Fixed 5V output voltage requirement
- Positive output configuration
- Surface mount 8-SOIC package compatibility
- Operating temperature range of -40°C to 125°C
- Over current and over temperature protection features
- RoHS3 compliance
The BD4269FJ-CE2 qualifies as a substitute based on matching these core electrical and mechanical specifications. While the BD4269FJ-CE2 offers enhanced specifications (200mA output current versus 150mA, 45V maximum input versus 20V, and automotive-grade qualification), it maintains full compatibility with the BD3951F-E2 in applications where these enhanced capabilities are not detrimental.
Parameter Comparison
| Parameter | BD3951F-E2 | BD4269FJ-CE2 |
|---|---|---|
| Manufacturer | Rohm Semiconductor | Rohm Semiconductor |
| Output Configuration | Positive | Positive |
| Output Type | Fixed | Fixed |
| Voltage - Output (Fixed) | 5V | 5V |
| Voltage - Input (Max) | 20V | 45V |
| Current - Output | 150mA | 200mA |
| Voltage Dropout (Max) | 0.5V @ 100mA | 0.5V @ 100mA |
| Operating Temperature Range | -40°C ~ 125°C | -40°C ~ 125°C |
| Package / Case | 8-SOIC (0.173", 4.40mm Width) | 8-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount | Surface Mount |
| Protection Features | Over Current, Over Temperature | Over Current, Over Temperature |
| Product Status | Not For New Designs | Active |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant |
| Series | - | Automotive, AEC-Q100 |
Engineering Selection Recommendations
The BD4269FJ-CE2 is the designated substitute for the BD3951F-E2. Selection between these parts should be based on the following criteria:
Use BD3951F-E2 when: Existing inventory is available and the part remains in stock. The device meets all electrical and thermal requirements of the application.
Use BD4269FJ-CE2 when: The BD3951F-E2 becomes unavailable or inventory is depleted. The application requires higher input voltage tolerance (45V maximum versus 20V). The application benefits from higher output current capability (200mA versus 150mA). Automotive-grade qualification and AEC-Q100 compliance are required or preferred. Long-term supply chain continuity is a priority, as this part carries Active product status.
Both parts maintain ROHS3 compliance and identical dropout voltage specifications. The BD4269FJ-CE2 provides superior performance margins and active manufacturer support, making it the preferred choice for new production runs or design refreshes.
Frequently Asked Questions (FAQ)
Q: Can the BD4269FJ-CE2 directly replace the BD3951F-E2 on existing PCBs?
A: Physical package compatibility requires verification. The BD3951F-E2 uses an 8-SOIC package with 0.173" (4.40mm) width, while the BD4269FJ-CE2 uses an 8-SOIC package with 0.154" (3.90mm) width. Footprint differences may require PCB layout modifications. Electrical compatibility is confirmed for applications operating within the BD3951F-E2 specifications.
Q: What are the key differences between these two regulators?
A: The BD4269FJ-CE2 offers higher maximum input voltage (45V versus 20V), higher output current (200mA versus 150mA), automotive-grade qualification (AEC-Q100), and Active product status. Both devices provide identical 5V fixed output, matching dropout voltage, and identical operating temperature range.
Q: Is the BD4269FJ-CE2 suitable for non-automotive applications?
A: Yes. Automotive-grade qualification indicates enhanced reliability and testing standards. These characteristics do not restrict use in non-automotive applications and provide additional performance assurance.
Q: What should be verified before substituting these parts?
A: Confirm PCB footprint compatibility with the different package widths. Verify that the application input voltage does not exceed 20V if using the BD3951F-E2, or can utilize the extended 45V range of the BD4269FJ-CE2. Ensure output current requirements do not exceed 150mA for the BD3951F-E2 or 200mA for the BD4269FJ-CE2.
Q: Are both parts RoHS compliant?
A: Yes. Both the BD3951F-E2 and BD4269FJ-CE2 are ROHS3 compliant and REACH unaffected.
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