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BD3940FP-E2 Equivalent & Substitute Parts
Part Overview
The BD3940FP-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 reached end-of-life status. Finding equivalent substitute parts is necessary for ongoing production support, maintenance applications, and legacy system repairs where continued component availability is required.
Substiute Parts
Key Parameters
| Parameter | BD3940FP-E2 |
|---|---|
| Manufacturer | Rohm Semiconductor |
| Output Voltage (Fixed) | 3.3V |
| Output Current | 500mA |
| Input Voltage (Max) | 25V |
| Dropout Voltage (Max) | 0.9V @ 100mA |
| Package Type | TO-252-3 (DPAK) |
| Operating Temperature Range | -40°C to 125°C |
| Product Status | Not For New Designs |
| RoHS Compliance | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitute parts for the BD3940FP-E2 are selected based on the following critical parameters that must align for functional equivalence:
- Fixed output voltage of 3.3V
- Output current capability of 500mA minimum
- TO-252-3 (DPAK) package compatibility
- Operating temperature range of -40°C to 125°C
- Surface mount technology
- Over Current and Over Temperature protection features
- RoHS3 compliance
The two identified substitute parts meet these core electrical and mechanical requirements, though variations exist in input voltage ratings, dropout voltage performance, and quiescent current specifications.
Parameter Comparison
| Parameter | BD3940FP-E2 (Rohm) | KF33BDT-TR (STMicroelectronics) | TL760M33QKVURQ1 (Texas Instruments) |
|---|---|---|---|
| Output Voltage | 3.3V Fixed | 3.3V Fixed | 3.3V Fixed |
| Output Current | 500mA | 500mA | 500mA |
| Input Voltage (Max) | 25V | 20V | 26V |
| Dropout Voltage (Max) | 0.9V @ 100mA | 0.7V @ 500mA | 0.5V @ 500mA |
| Quiescent Current | 30 µA | 1 mA | 15 mA |
| Package | TO-252-3 (DPAK) | TO-252-3 (DPAK) | TO-252-3 (DPAK) |
| Operating Temperature | -40°C to 125°C | -40°C to 125°C | -40°C to 125°C |
| Protection Features | Over Current, Over Temperature | Over Current, Over Temperature | Over Current, Over Temperature, Over Voltage |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Product Status | Not For New Designs | Active | Last Time Buy |
Engineering Selection Recommendations
KF33BDT-TR (STMicroelectronics) is an active product with full production support. This substitute offers improved dropout voltage performance (0.7V @ 500mA versus 0.9V @ 100mA) and lower quiescent current (1 mA). However, the maximum input voltage is limited to 20V compared to the original 25V specification. This part is suitable for applications where input voltage does not exceed 20V and where active product support is required.
TL760M33QKVURQ1 (Texas Instruments) carries Last Time Buy status and includes automotive-grade qualification (AEC-Q100) with additional over-voltage protection. This part supports the highest input voltage (26V) and offers the lowest dropout voltage (0.5V @ 500mA). The higher quiescent current (15 mA) and moisture sensitivity level (MSL 3) should be evaluated against application requirements. This substitute is appropriate for automotive or high-reliability applications requiring extended input voltage tolerance.
Both substitutes maintain full electrical and mechanical compatibility with the original BD3940FP-E2 in terms of output voltage, current rating, package form factor, and operating temperature range.
Frequently Asked Questions (FAQ)
Q: Can KF33BDT-TR replace BD3940FP-E2 in all applications?
A: KF33BDT-TR is electrically compatible for applications where input voltage remains below 20V. The original BD3940FP-E2 supports up to 25V input. Verify your circuit's maximum input voltage before substitution.
Q: What is the difference between the two substitute parts?
A: KF33BDT-TR is an active product from STMicroelectronics with lower quiescent current but limited to 20V input. TL760M33QKVURQ1 is a Texas Instruments automotive-qualified part with Last Time Buy status, supporting 26V input and offering superior dropout voltage performance.
Q: Are all three parts in the same package?
A: Yes. BD3940FP-E2, KF33BDT-TR, and TL760M33QKVURQ1 all use the TO-252-3 (DPAK) package with identical pinout and thermal characteristics, enabling direct board-level substitution.
Q: Which substitute should I choose for new production?
A: KF33BDT-TR is recommended for new production due to its Active product status and ongoing manufacturer support. Verify that your application's maximum input voltage does not exceed 20V.
Q: What is the significance of "Last Time Buy" status for TL760M33QKVURQ1?
A: Last Time Buy indicates Texas Instruments has announced end-of-life for this part. Existing inventory may be available, but no new production is planned. This part is suitable for legacy system support or applications with long component lead times already secured.
Q: Are there any compliance differences between the three parts?
A: All three parts are ROHS3 compliant and REACH unaffected. TL760M33QKVURQ1 includes AEC-Q100 automotive qualification, making it suitable for automotive applications requiring this certification.
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