BD33KA5WFP-E2 Equivalent & Substitute Parts

Part Overview

The BD33KA5WFP-E2 is a linear voltage regulator IC manufactured by Rohm Semiconductor, designed to provide a fixed 3.3V output at 500mA. This positive fixed output regulator operates across an input voltage range up to 5.5V with a maximum dropout voltage of 0.2V at 200mA. The device is housed in a TO-252-5 (DPAK) surface mount package and is actively produced with full RoHS3 compliance. Finding equivalent substitute parts is necessary when addressing supply chain constraints, inventory availability, or specific application requirements such as automotive qualification or enhanced thermal performance.

Substiute Parts

BD33KA5WFP-E2

Rohm SemiconductorIn Stock: 17604BD33KA5WFP-E2 Datasheet

Current PartRFQ

LP38691SD-3.3/NOPB

Texas InstrumentsIn Stock: 10151LP38691SD-3.3/NOPB Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BD33KA5WFP-E2 is determined by the following critical parameters:

• Fixed output voltage of 3.3V
• Output current capability of 500mA minimum
• Input voltage tolerance up to 5.5V or higher
• Surface mount packaging with compatible thermal characteristics
• Over temperature protection as a minimum protection feature
• Active product status and RoHS3 compliance

The LP38691SD-3.3/NOPB qualifies as a functional equivalent based on matching output voltage (3.3V), output current (500mA), and core protection features (over temperature). While package form factors differ (TO-252-5 versus 6-WSON), both are surface mount technologies suitable for equivalent thermal management in standard applications.

Parameter Comparison

Engineering Selection Recommendations

Both the BD33KA5WFP-E2 and LP38691SD-3.3/NOPB are active products with full RoHS3 compliance and REACH unaffected status. Selection between these devices should be based on the following provided specifications:

The BD33KA5WFP-E2 offers lower dropout voltage (0.2V @ 200mA) and integrated over-current protection, making it suitable for applications with tighter input voltage margins or requiring current limiting functionality. The LP38691SD-3.3/NOPB provides extended input voltage tolerance (10V maximum), lower quiescent current (55 µA), and automotive qualification (AEC-Q100), making it appropriate for automotive applications or battery-powered systems requiring minimal standby current draw.

Package compatibility must be verified at the PCB layout stage, as the TO-252-5 and 6-WSON packages have different footprints and thermal characteristics.

Frequently Asked Questions (FAQ)

Q: Can the LP38691SD-3.3/NOPB directly replace the BD33KA5WFP-E2 on an existing PCB?

A: Direct PCB replacement is not possible without layout modification. The BD33KA5WFP-E2 uses a TO-252-5 (DPAK) package, while the LP38691SD-3.3/NOPB uses a 6-WSON (3x3) package. These have different footprints, pin configurations, and thermal pad designs. PCB redesign is required.

Q: What are the key electrical differences between these two regulators?

A: The primary differences are dropout voltage (BD33KA5WFP-E2: 0.2V @ 200mA versus LP38691SD-3.3/NOPB: 0.55V @ 500mA), quiescent current (BD33KA5WFP-E2: 550 µA versus LP38691SD-3.3/NOPB: 55 µA), and input voltage maximum rating (BD33KA5WFP-E2: 5.5V versus LP38691SD-3.3/NOPB: 10V). The BD33KA5WFP-E2 includes over-current protection; the LP38691SD-3.3/NOPB does not.

Q: Is the LP38691SD-3.3/NOPB suitable for automotive applications?

A: Yes. The LP38691SD-3.3/NOPB carries AEC-Q100 automotive qualification. The BD33KA5WFP-E2 does not list automotive qualification in the provided specifications.

Q: Which regulator has better noise performance?

A: Both devices provide comparable PSRR performance at 120Hz (BD33KA5WFP-E2: 50dB; LP38691SD-3.3/NOPB: 55dB). The difference is minimal for most applications.

Q: What is the operating temperature range difference?

A: The BD33KA5WFP-E2 operates from -40°C to 105°C. The LP38691SD-3.3/NOPB operates from -40°C to 125°C, providing a 20°C extended upper temperature rating.