DB2W40300L Equivalent & Substitute Parts

Part Overview

The DB2W40300L is a Schottky diode manufactured by Panasonic Electronic Components, rated for 40 V DC reverse voltage and 3 A average rectified current in a surface mount SOD-123F package. This component is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement requirements. Substitute parts must maintain compatibility with the original electrical specifications and mechanical form factor while considering current product availability and compliance status.

Substiute Parts

DB2W40300L

Panasonic Electronic ComponentsIn Stock: 9419DB2W40300L Datasheet

Current PartRFQ

RBR2MM40BTFTR

Rohm SemiconductorIn Stock: 4499RBR2MM40BTFTR Datasheet

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RBR2MM40BTR

Rohm SemiconductorIn Stock: 12385RBR2MM40BTR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the DB2W40300L are identified based on the following critical parameters that determine functional equivalence:

Matching Parameters:

• Voltage - DC Reverse (Vr) (Max): 40 V
• Package / Case: SOD-123F
• Mounting Type: Surface Mount
• Technology: Schottky
• Operating Temperature - Junction (Max): 150°C

Allowable Variation Parameters:

• Current - Average Rectified (Io): Substitute parts rated at 2 A are acceptable for applications where the circuit design does not require the full 3 A capacity of the original part
• Voltage - Forward (Vf) (Max) @ If: Minor variations within the Schottky diode characteristic range are acceptable
• Current - Reverse Leakage @ Vr: Lower leakage current in substitutes represents improved performance

The identified substitute parts RBR2MM40BTFTR and RBR2MM40BTR from Rohm Semiconductor meet the core voltage, package, and temperature requirements. Both parts are rated for 2 A average rectified current, which represents a reduction from the original 3 A specification. These substitutes are suitable for applications where the circuit current demand does not exceed 2 A.

Parameter Comparison

Engineering Selection Recommendations

RBR2MM40BTFTR (Rohm Semiconductor): This part is suitable for applications where the circuit current requirement does not exceed 2 A. The part carries AEC-Q101 automotive qualification and ROHS3 compliance, indicating suitability for automotive and regulated applications. Current inventory of 4,400 pieces is available. The lower reverse leakage current (80 µA versus 250 µA) represents improved performance characteristics. Forward voltage drop is marginally higher at 550 mV compared to 540 mV at the original part's rated current.

RBR2MM40BTR (Rohm Semiconductor): This part is functionally equivalent to RBR2MM40BTFTR with identical electrical specifications. The primary distinction is higher current inventory availability (12,300 pieces) and standard commercial qualification without automotive-specific certification. ROHS3 compliance and unlimited moisture sensitivity level match the substitute group. Forward voltage drop is 560 mV at 2 A, representing the highest forward voltage among the three parts.

Both Rohm substitutes are active products with established supply chains, addressing the discontinuation status of the original DB2W40300L. Selection between the two Rohm options depends on application requirements for automotive qualification and current availability constraints.

Frequently Asked Questions (FAQ)

Q: Can RBR2MM40BTFTR or RBR2MM40BTR be used as direct replacements for DB2W40300L?

A: These parts are functionally equivalent for applications where the circuit current requirement does not exceed 2 A. The 40 V voltage rating, SOD-123F package, surface mount configuration, and 150°C maximum junction temperature are identical. If the circuit design requires the full 3 A capacity of the original part, these 2 A rated substitutes are not suitable.

Q: What is the difference between RBR2MM40BTFTR and RBR2MM40BTR?

A: Both parts have identical electrical specifications. RBR2MM40BTFTR carries AEC-Q101 automotive qualification, while RBR2MM40BTR is standard commercial grade. RBR2MM40BTR has higher inventory availability (12,300 pieces versus 4,400 pieces). Forward voltage specifications differ slightly: 550 mV for RBR2MM40BTFTR and 560 mV for RBR2MM40BTR, both measured at 2 A.

Q: Are the forward voltage differences between these parts significant?

A: The forward voltage variations (540 mV, 550 mV, and 560 mV) are measured at different current levels. DB2W40300L is specified at 3 A, while both Rohm substitutes are specified at 2 A. Direct voltage comparison at identical current levels is not possible from the provided specifications. Circuit designs with tight voltage margin requirements should account for the specified forward voltage of the selected substitute at its rated current.

Q: What does the lower reverse leakage current in the Rohm parts indicate?

A: The Rohm substitutes exhibit 80 µA reverse leakage at 40 V compared to 250 µA for the DB2W40300L. Lower reverse leakage current indicates reduced parasitic current flow in the reverse-biased state, which generally represents improved device performance and lower power dissipation in standby conditions.

Q: Are there any package or mounting differences between these parts?

A: All three parts use the SOD-123F package with surface mount configuration. No mechanical or mounting differences exist. PCB layout and assembly processes remain unchanged when substituting between these parts.

Q: What compliance certifications apply to each part?

A: DB2W40300L is RoHS Compliant. RBR2MM40BTFTR is ROHS3 Compliant with AEC-Q101 automotive qualification. RBR2MM40BTR is ROHS3 Compliant. All three parts have Moisture Sensitivity Level 1 (Unlimited). REACH status is unaffected for the Rohm parts.