BD3571HFP-TR Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The BD3571HFP-TR is a linear voltage regulator IC manufactured by Rohm Semiconductor, designed for positive fixed 5V output applications with 500mA current capacity. This device operates in the Power Management (PMIC) category and is packaged in HRP-5 (5 Leads + Tab) surface mount configuration.

The BD3571HFP-TR carries a "Not For New Designs" product status, indicating it is legacy technology. Identifying equivalent and substitute parts is necessary for ongoing maintenance, repair, and production support of existing systems utilizing this regulator, as well as for applications requiring continued availability beyond the original design phase.

Key Parameters

Parameter	Value
Manufacturer	Rohm Semiconductor
Output Voltage (Fixed)	5V
Output Current	500mA
Input Voltage (Max)	36V
Voltage Dropout (Max)	0.48V @ 200mA
Operating Temperature Range	-40°C ~ 125°C
Package Type	HRP-5 (5 Leads + Tab)
Mounting Type	Surface Mount
Protection Features	Over Current, Over Temperature
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the BD3571HFP-TR is determined by the following critical parameters:

Output Voltage: Must be fixed at 5V
Output Current Capacity: Minimum 500mA required for direct substitution; lower capacity parts may be used only if system design permits reduced current handling
Input Voltage Range: Maximum input voltage must be ≥36V
Voltage Dropout: Must be ≤0.48V at specified current levels to maintain regulation performance
Package Compatibility: Physical and electrical pin compatibility with HRP-5 or equivalent 5-lead + tab surface mount packages
Operating Temperature: Must support -40°C ~ 125°C minimum range
Protection Features: Over Current and Over Temperature protection required
Compliance: RoHS3 compliance mandatory for modern supply chains

The TLE42764GV50ATMA1 from Infineon Technologies qualifies as a substitute based on these parameters, with noted differences in output current capacity and additional protection features.

Parameter Comparison

Parameter	BD3571HFP-TR (Rohm)	TLE42764GV50ATMA1 (Infineon)
Output Voltage (Fixed)	5V	5V
Output Current	500mA	400mA
Input Voltage (Max)	36V	40V
Voltage Dropout (Max)	0.48V @ 200mA	0.5V @ 250mA
Quiescent Current (Iq)	30 µA	220 µA
Operating Temperature Range	-40°C ~ 125°C	-40°C ~ 150°C
Package Type	HRP-5 (5 Leads + Tab)	TO-263-5 (5 Leads + Tab)
Protection Features	Over Current, Over Temperature	Over Current, Over Temperature, Reverse Polarity, Short Circuit
Product Status	Not For New Designs	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Automotive Grade	Not specified	AEC-Q100 Qualified

Engineering Selection Recommendations

The TLE42764GV50ATMA1 serves as a functional substitute for the BD3571HFP-TR in applications where the following conditions are met:

Output Current Consideration: The TLE42764GV50ATMA1 provides 400mA maximum output current versus the BD3571HFP-TR's 500mA. Systems designed for the full 500mA capacity of the original part must verify that 400mA is sufficient for the application load. For applications requiring the full 500mA specification, the original BD3571HFP-TR or equivalent 500mA-rated alternatives must be used.

Package Compatibility: Both devices use 5-lead + tab surface mount packages (HRP-5 and TO-263-5 respectively). Physical footprint verification is required before PCB-level substitution, as package dimensions may differ despite functional equivalence.

Compliance and Qualification: The TLE42764GV50ATMA1 holds Active product status and AEC-Q100 automotive qualification, providing superior long-term availability and reliability assurance compared to the legacy BD3571HFP-TR. Both parts maintain ROHS3 compliance.

Temperature Range: The TLE42764GV50ATMA1 extends the upper operating temperature to 150°C versus 125°C for the BD3571HFP-TR, providing additional thermal margin in high-temperature environments.

Additional Protection: The Infineon part includes Reverse Polarity and Short Circuit protection in addition to the Over Current and Over Temperature features present in both devices.

Frequently Asked Questions (FAQ)

Q: Can the TLE42764GV50ATMA1 directly replace the BD3571HFP-TR in all applications?

A: Direct replacement is possible only if the application current requirement does not exceed 400mA. The TLE42764GV50ATMA1 is rated for 400mA maximum output, while the BD3571HFP-TR is rated for 500mA. Applications requiring the full 500mA specification must use the original part or identify alternative 500mA-rated regulators.

Q: Are the HRP-5 and TO-263-5 packages physically compatible?

A: Both packages are 5-lead + tab surface mount configurations with similar electrical pin assignments. However, physical dimensions and PCB footprint requirements may differ. PCB layout verification is required before substitution to ensure mechanical fit and thermal performance.

Q: What is the significance of the "Not For New Designs" status on the BD3571HFP-TR?

A: This status indicates the part is legacy technology no longer recommended for new product development. The manufacturer may discontinue production or reduce support. The TLE42764GV50ATMA1, with Active status, represents a modern alternative with ongoing manufacturer support and availability assurance.

Q: Does the TLE42764GV50ATMA1 require different circuit design considerations?

A: Both regulators share the same 5V fixed output voltage, Enable control feature, and core protection mechanisms. The primary design consideration is the reduced output current capacity (400mA vs. 500mA). The TLE42764GV50ATMA1's higher quiescent current (220 µA vs. 30 µA) may impact low-power standby applications.

Q: Are both parts RoHS compliant?

A: Yes, both the BD3571HFP-TR and TLE42764GV50ATMA1 are ROHS3 compliant and REACH unaffected, meeting modern environmental and regulatory requirements.

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