BD3930FP-E2 Equivalent & Substitute Parts

Part Overview

The BD3930FP-E2 is a linear voltage regulator IC manufactured by Rohm Semiconductor, designed to deliver a fixed 3.3V output at 500mA in a TO-252 surface mount package. This device is classified as Not For New Designs, indicating it has been superseded in Rohm's product portfolio. Finding equivalent substitute parts is necessary for ongoing production support, maintenance applications, and legacy system repairs where the original component may no longer be readily available or where design flexibility permits component selection from active product lines.

Substiute Parts

BD3930FP-E2

Rohm SemiconductorIn Stock: 19708BD3930FP-E2 Datasheet

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LF33ABDT-TR

STMicroelectronicsIn Stock: 127308LF33ABDT-TR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the BD3930FP-E2 are identified based on the following critical parameters that must align for functional equivalence:

• Fixed output voltage of 3.3V
• Output current capability of 500mA minimum
• Surface mount DPAK (TO-252-3) package
• Operating temperature range of -40°C to 125°C
• Positive fixed output configuration with single regulator
• RoHS3 compliance for regulatory alignment

The LF33ABDT-TR from STMicroelectronics meets these core substitution criteria. While differences exist in maximum input voltage, dropout voltage, and quiescent current specifications, these variations remain within acceptable operational boundaries for most applications utilizing the BD3930FP-E2.

Parameter Comparison

Engineering Selection Recommendations

The LF33ABDT-TR is suitable as a substitute for the BD3930FP-E2 in applications where the input voltage requirement does not exceed 16V. The substitute part offers superior performance characteristics, including lower dropout voltage and higher PSRR, while maintaining identical output voltage and current specifications. The LF33ABDT-TR carries Active product status, ensuring long-term availability and continued manufacturer support, contrasting with the BD3930FP-E2's Not For New Designs classification. Both parts maintain ROHS3 compliance and identical operating temperature ranges, supporting direct PCB-level replacement without thermal or regulatory concerns. Applications requiring input voltages above 16V or reverse polarity protection must retain the original BD3930FP-E2 or identify alternative regulators with higher input voltage ratings.

Frequently Asked Questions (FAQ)

Q: Can the LF33ABDT-TR directly replace the BD3930FP-E2 on existing PCBs?

A: Yes, both parts use identical TO-252-3 (DPAK) packaging with the same pinout and footprint. Direct PCB replacement is possible without layout modifications.

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

A: The maximum input voltage differs: BD3930FP-E2 accepts up to 25V, while LF33ABDT-TR is rated to 16V maximum. The LF33ABDT-TR provides superior dropout voltage performance (0.7V @ 500mA versus 1.5V @ 100mA) and higher power supply rejection ratio.

Q: Are there applications where the BD3930FP-E2 cannot be substituted?

A: Yes. Applications requiring input voltages between 16V and 25V must use the BD3930FP-E2 or select an alternative regulator rated for higher input voltages. Additionally, circuits requiring reverse polarity protection should retain the BD3930FP-E2, as the LF33ABDT-TR lacks this protection feature.

Q: Does the higher quiescent current of the LF33ABDT-TR affect battery-powered applications?

A: The LF33ABDT-TR draws 1 mA quiescent current compared to 30 µA for the BD3930FP-E2. In ultra-low-power or battery-critical applications, this 33-fold difference may be significant and should be evaluated against system power budgets.

Q: Are both parts compliant with current regulatory standards?

A: Yes, both the BD3930FP-E2 and LF33ABDT-TR are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic component manufacturing and distribution.