BD3941FP-E2 Equivalent & Substitute Parts

Part Overview

The BD3941FP-E2 is a linear voltage regulator IC manufactured by Rohm Semiconductor, designed to provide a fixed 5V output at 500mA in a surface-mount TO-252 package. This active product is widely used in power management applications requiring positive fixed voltage regulation with integrated over-current and over-temperature protection. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to supply constraints, design flexibility, or application-specific requirements.

Substiute Parts

BD3941FP-E2

Rohm SemiconductorIn Stock: 22421BD3941FP-E2 Datasheet

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LM78M05CDTX/NOPB

Texas InstrumentsIn Stock: 25511LM78M05CDTX/NOPB Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the BD3941FP-E2 are qualified based on the following critical parameters:

• Fixed 5V output voltage
• 500mA output current capability
• TO-252-3 package compatibility (identical mechanical footprint)
• Surface-mount configuration
• Positive output configuration
• Operating temperature range of -40°C to 125°C
• Active product status
• RoHS3 compliance

The LM78M05CDTX/NOPB from Texas Instruments meets these substitution criteria. Both devices share identical output specifications, package form factor, and regulatory compliance status, enabling direct functional replacement in applications where the BD3941FP-E2 is specified.

Parameter Comparison

Engineering Selection Recommendations

Both the BD3941FP-E2 and LM78M05CDTX/NOPB are active products with ROHS3 compliance and identical output specifications. Selection between these devices is based on the following factors:

• Input Voltage Tolerance: The LM78M05CDTX/NOPB supports a maximum input voltage of 35V compared to 25V for the BD3941FP-E2, providing greater input voltage margin in applications with variable supply sources.

• Quiescent Current: The BD3941FP-E2 exhibits lower quiescent current (30 µA) compared to the LM78M05CDTX/NOPB (3 mA), making it preferable for battery-powered or low-power standby applications.

• Power Supply Rejection Ratio: The LM78M05CDTX/NOPB provides superior PSRR performance (78dB at 120Hz) versus the BD3941FP-E2 (55dB at 120Hz), offering better noise rejection in applications with ripple-laden input supplies.

• Protection Features: The LM78M05CDTX/NOPB includes short-circuit protection in addition to over-current and over-temperature protection.

• Packaging: Both devices use identical TO-252-3 packages, ensuring mechanical and electrical compatibility without PCB redesign.

Frequently Asked Questions (FAQ)

Q: Can the LM78M05CDTX/NOPB directly replace the BD3941FP-E2 on an existing PCB?

A: Yes. Both devices use the TO-252-3 package with identical pin configuration and electrical output specifications (5V, 500mA). No PCB modifications are required for mechanical or electrical compatibility.

Q: What is the primary difference between these two regulators?

A: The LM78M05CDTX/NOPB supports higher maximum input voltage (35V vs. 25V) and provides superior PSRR performance (78dB vs. 55dB). The BD3941FP-E2 offers lower quiescent current (30 µA vs. 3 mA), making it more suitable for low-power applications.

Q: Are both devices RoHS compliant?

A: Yes. Both the BD3941FP-E2 and LM78M05CDTX/NOPB are ROHS3 compliant and REACH unaffected.

Q: What is the operating temperature range for both devices?

A: Both devices operate across the identical temperature range of -40°C to 125°C.

Q: Which device should be selected for battery-powered applications?

A: The BD3941FP-E2 is preferable for battery-powered applications due to its significantly lower quiescent current (30 µA), which reduces standby power consumption.

Q: Which device is better for high-noise input environments?

A: The LM78M05CDTX/NOPB provides superior power supply rejection ratio (78dB at 120Hz), making it more effective at rejecting input voltage ripple and noise.