BD3571FP-E2 Equivalent & Substitute Parts

Part Overview

The BD3571FP-E2 is a linear voltage regulator IC manufactured by Rohm Semiconductor, delivering a fixed 5V output at 500mA in a TO-252-3 (DPAK) surface mount package. This device is classified as Not For New Designs, indicating it has reached end-of-life status. Finding equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support existing production requirements. Substitute parts must maintain electrical compatibility across output voltage, current capacity, input voltage range, and thermal performance while accommodating packaging and availability constraints.

Key Parameters

Parameter	BD3571FP-E2 Value
Output Voltage (Fixed)	5V
Output Current	500mA
Input Voltage (Max)	36V
Voltage Dropout (Max)	0.48V @ 200mA
Quiescent Current (Iq)	30 µA
PSRR	55dB (120Hz)
Protection Features	Over Current, Over Temperature
Operating Temperature	-40°C ~ 125°C
Package / Case	TO-252-3, DPAK (2 Leads + Tab), SC-63
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the BD3571FP-E2 are categorized based on output current capacity and electrical performance alignment:

Primary Substitutes (500mA Output Current): Parts matching the full 500mA output specification maintain direct functional equivalence. These include LM78M05CDT/NOPB and LM78M05CDTX/NOPB from Texas Instruments, both delivering 500mA at 5V fixed output in TO-252-3 packaging.

Secondary Substitutes (100mA Output Current): Parts with reduced output current (LM2931ADT-5.0RKG and LM2931DT-5.0G from onsemi) are suitable for applications where the full 500mA capacity is not required. These maintain the 5V fixed output and TO-252-3 package compatibility.

Tertiary Substitutes (50mA Output Current): Ultra-low current regulators (LM2936 series from Texas Instruments and LM9036DT-5.0/NOPB) serve applications requiring minimal current draw. These include multiple packaging options (Tube, Cut Tape, Tape & Reel) and automotive-qualified variants.

Alternative Manufacturer (400mA Output Current): The IFX25001TFV50ATMA1 from Infineon Technologies provides 400mA output, bridging the gap between full 500mA and reduced current options, with enhanced protection features including reverse polarity and short circuit protection.

Key Substitution Parameters:

Output voltage: 5V fixed (all substitutes)
Package: TO-252-3 DPAK (all substitutes)
Operating temperature: -40°C ~ 125°C (all substitutes)
RoHS3 compliance (all substitutes)
Output current capacity (varies by substitute group)
Input voltage maximum rating (26V to 40V range)

Parameter Comparison

Part Number	Manufacturer	Output Current	Input Voltage (Max)	Voltage Dropout (Max)	Quiescent Current (Iq)	PSRR	Protection Features	Product Status	Packaging
BD3571FP-E2	Rohm Semiconductor	500mA	36V	0.48V @ 200mA	30 µA	55dB (120Hz)	Over Current, Over Temperature	Not For New Designs	TO-252-3
IFX25001TFV50ATMA1	Infineon Technologies	400mA	40V	0.5V @ 250mA	220 µA	60dB (100Hz)	Over Current, Over Temperature, Reverse Polarity, Short Circuit	Obsolete	PG-TO252-3
LM2931ADT-5.0RKG	onsemi	100mA	26V	0.6V @ 100mA	1 mA	90dB (120Hz)	Over Current, Over Temperature	Active	DPAK
LM2931DT-5.0G	onsemi	100mA	26V	0.6V @ 100mA	1 mA	90dB (120Hz)	Over Current, Over Temperature	Active	DPAK
LM2936DT-5.0/NOPB	Texas Instruments	50mA	40V	0.4V @ 50mA	9 µA	60dB (120Hz)	Over Temperature, Reverse Polarity, Short Circuit	Active	TO-252-3
LM2936DTX-5.0/NOPB	Texas Instruments	50mA	40V	0.4V @ 50mA	9 µA	60dB (120Hz)	Over Temperature, Reverse Polarity, Short Circuit	Active	TO-252-3
LM2936QDT-5.0/NOPB	Texas Instruments	50mA	40V	0.4V @ 50mA	9 µA	60dB (120Hz)	Over Temperature, Reverse Polarity, Short Circuit	Active	TO-252-3
LM2936QDTX-5.0/NOPB	Texas Instruments	50mA	40V	0.4V @ 50mA	9 µA	60dB (120Hz)	Over Temperature, Reverse Polarity, Short Circuit	Active	TO-252-3
LM78M05CDT/NOPB	Texas Instruments	500mA	35V	Not Specified	3 mA	78dB (120Hz)	Over Current, Over Temperature, Short Circuit	Active	TO-252-3
LM78M05CDTX/NOPB	Texas Instruments	500mA	35V	Not Specified	3 mA	78dB (120Hz)	Over Current, Over Temperature, Short Circuit	Active	TO-252-3
LM9036DT-5.0/NOPB	Texas Instruments	50mA	40V	0.40V @ 50mA	20 µA	60dB (120Hz)	Over Temperature, Reverse Polarity, Short Circuit	Active	TO-252-3

Engineering Selection Recommendations

For Direct 500mA Replacement: LM78M05CDT/NOPB and LM78M05CDTX/NOPB from Texas Instruments are the primary choices. Both are Active status parts with ROHS3 compliance, identical 5V output, 500mA current capacity, and TO-252-3 packaging. The CDTX variant is supplied in Cut Tape & Digi-Reel format, while CDT is supplied in Tube. Both maintain compatibility with the original BD3571FP-E2 electrical specifications and footprint.

For Reduced Current Applications: When application requirements permit lower output current, LM2931ADT-5.0RKG and LM2931DT-5.0G from onsemi provide Active status alternatives with superior PSRR performance (90dB vs. 55dB). These are suitable for designs requiring 100mA or less. The LM2931DT-5.0G is supplied in Tube packaging, while LM2931ADT-5.0RKG is supplied in Cut Tape & Digi-Reel format.

For Ultra-Low Current Applications: The LM2936 series (DT, DTX, QDT, QDTX variants) and LM9036DT-5.0/NOPB from Texas Instruments serve applications requiring 50mA or less. The LM2936QDT and LM2936QDTX variants include AEC-Q100 automotive qualification. All maintain Active product status and ROHS3 compliance.

For Intermediate Current (400mA): IFX25001TFV50ATMA1 from Infineon Technologies bridges the gap between full 500mA and reduced current options. However, this part is classified as Obsolete, limiting its suitability for new production despite enhanced protection features.

Compliance Considerations: All recommended Active status substitutes maintain ROHS3 compliance and MSL ratings compatible with standard manufacturing processes. Parts with Automotive qualification (LM2936QDT/QDTX) are available for applications requiring AEC-Q100 certification.

Frequently Asked Questions (FAQ)

Q: Can LM78M05CDT/NOPB directly replace BD3571FP-E2 in existing designs?

A: Yes. Both parts deliver 5V fixed output at 500mA in TO-252-3 packaging with identical pinout. Electrical specifications are compatible across the operating temperature range (-40°C to 125°C). The LM78M05 series has higher PSRR (78dB vs. 55dB) and lower quiescent current (3mA vs. 30µA), making it a superior replacement. Both are ROHS3 compliant.

Q: What is the difference between LM2936DT-5.0/NOPB, LM2936DTX-5.0/NOPB, and LM2936QDT-5.0/NOPB?

A: These are variants of the same LM2936 base part with identical electrical specifications (50mA output, 5V fixed). The differences are packaging format (DT = Tube, DTX = Cut Tape & Digi-Reel, QDT = Tube with AEC-Q100 automotive qualification) and MSL rating (standard = 2 years, automotive = 2 years). Select based on supply chain requirements and automotive qualification needs.

Q: Why do some substitutes have lower output current than the BD3571FP-E2?

A: The BD3571FP-E2 is end-of-life. Current-generation alternatives from major manufacturers (Texas Instruments, onsemi) emphasize lower quiescent current and improved PSRR over maximum output current. For applications requiring full 500mA capacity, LM78M05 series parts are available. For lower-current applications, LM2931 and LM2936 series provide superior performance characteristics.

Q: Are all substitute parts available in the same TO-252-3 package?

A: Yes. All listed substitutes use TO-252-3 (DPAK with 2 Leads + Tab, SC-63) packaging, ensuring mechanical and electrical compatibility. Packaging format variations (Tube, Cut Tape, Tape & Reel) affect supply chain logistics but not physical footprint or pinout.

Q: What is the significance of the Obsolete status for IFX25001TFV50ATMA1?

A: Obsolete status indicates the part is no longer manufactured or supported by Infineon Technologies. While it provides 400mA output with enhanced protection features, it is not recommended for new production due to supply chain uncertainty and lack of manufacturer support. Active status parts (LM78M05, LM2931, LM2936, LM9036 series) are preferred.

Q: Can I use a 50mA regulator (LM2936 series) in place of the 500mA BD3571FP-E2?

A: Only if your application circuit draws 50mA or less. The LM2936 series is current-limited to 50mA output. Attempting to draw more current will trigger over-current protection. Verify actual circuit current requirements before selecting a reduced-capacity substitute.

Q: What does ROHS3 compliance mean for these parts?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. All listed substitutes are ROHS3 compliant, ensuring compatibility with environmental regulations and procurement standards.

Q: Which substitute offers the best PSRR performance?

A: LM2931ADT-5.0RKG and LM2931DT-5.0G from onsemi provide the highest PSRR at 90dB (120Hz), compared to 55dB for the original BD3571FP-E2. This superior power supply rejection ratio reduces noise coupling from the input supply to the output, beneficial for noise-sensitive applications.

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