DB2S40600L Schottky Diode Equivalent & Substitute Parts

Part Overview

The DB2S40600L is a Schottky rectifier diode manufactured by Panasonic Electronic Components, rated for 40 V DC reverse voltage and 100 mA average rectified current in an SC-79 surface mount package. This part is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design requirements and production needs. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives within acceptable parameter ranges for Schottky diode applications.

Key Parameters

Parameter	Value	Unit
Technology	Schottky	—
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	100	mA
Voltage - Forward (Vf) (Max) @ If	600 mV @ 100 mA	—
Reverse Recovery Time (trr)	900	ps
Current - Reverse Leakage @ Vr	5	µA @ 40 V
Mounting Type	Surface Mount	—
Package / Case	SC-79, SOD-523	—
Operating Temperature - Junction (Max)	125	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the DB2S40600L is determined by the following critical parameters:

Voltage Rating (Vr): Substitute parts must maintain a minimum DC reverse voltage rating of 40 V. Parts rated above 40 V are acceptable for voltage-constrained applications.

Current Rating (Io): Substitute parts must support a minimum average rectified current of 100 mA. Parts rated at or above 100 mA are functionally compatible.

Technology: All substitutes must employ Schottky diode technology to maintain forward voltage characteristics and switching speed performance.

Package / Case: All substitutes must use SC-79 or SOD-523 surface mount packages to ensure mechanical and thermal compatibility with existing PCB layouts.

Mounting Type: All substitutes must be surface mount devices.

RoHS Compliance: All substitutes must maintain ROHS3 compliance status.

MSL Rating: All substitutes must maintain MSL 1 (Unlimited) classification.

Substitute parts are categorized into two groups: direct electrical equivalents (matching voltage and current ratings) and functional substitutes (meeting or exceeding voltage and current requirements with acceptable parameter variations).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [mA]	Vf (Max) @ If [mV]	Reverse Leakage @ Vr [µA]	Package	Tj (Max) [°C]	Product Status
DB2S40600L	Panasonic Electronic Components	40	100	600 @ 100 mA	5 @ 40 V	SC-79, SOD-523	125	Discontinued
RB510SM-40T2R	Rohm Semiconductor	40	100	480 @ 10 mA	2 @ 40 V	SC-79, SOD-523	150	Active
RB510SM-40FHT2R	Rohm Semiconductor	40	100	480 @ 10 mA	2 @ 40 V	SC-79, SOD-523	150	Active
RB521SM-40T2R	Rohm Semiconductor	40	200	540 @ 200 mA	90 @ 40 V	SC-79, SOD-523	150	Active
CES388,L3F	Toshiba Semiconductor and Storage	40	100	600 @ 100 mA	5 @ 40 V	SC-79, SOD-523	125	Active
RB751SM-40T2R	Rohm Semiconductor	30	30	370 @ 1 mA	0.5 @ 30 V	SC-79, SOD-523	150	Active
BAS5202VH6327XTSA1	Infineon Technologies	45	750	600 @ 200 mA	10 @ 45 V	SC-79, SOD-523	150	Active

Engineering Selection Recommendations

Direct Electrical Equivalents:

CES388,L3F (Toshiba Semiconductor and Storage) is a parametric equivalent to the DB2S40600L, matching the 40 V voltage rating, 100 mA current rating, and 600 mV forward voltage specification. This part is currently active in production and maintains ROHS3 compliance and MSL 1 classification. The CES388,L3F is suitable for direct substitution in applications where the original DB2S40600L specifications are required.

Functional Substitutes with Improved Performance:

RB510SM-40T2R and RB510SM-40FHT2R (Rohm Semiconductor) both meet the 40 V and 100 mA requirements with improved forward voltage characteristics (480 mV @ 10 mA versus 600 mV @ 100 mA). Both parts are active in production, ROHS3 compliant, and feature higher maximum junction temperature (150°C versus 125°C). The RB510SM-40FHT2R carries AEC-Q101 automotive qualification. These parts are suitable for applications where lower forward voltage drop is beneficial.

Functional Substitutes with Increased Current Capacity:

RB521SM-40T2R (Rohm Semiconductor) provides 40 V voltage rating with doubled current capacity (200 mA versus 100 mA). This part is active in production and suitable for applications requiring higher current handling within the same voltage class.

Limited Substitutes:

RB751SM-40T2R (Rohm Semiconductor) is listed as a substitute but operates at reduced voltage (30 V) and current (30 mA) ratings. This part is suitable only for applications with lower voltage and current requirements than the original specification.

BAS5202VH6327XTSA1 (Infineon Technologies) provides significantly higher voltage (45 V) and current (750 mA) ratings. This part is suitable for applications requiring enhanced performance margins but represents over-specification for the original DB2S40600L application.

Frequently Asked Questions (FAQ)

Q: Can RB510SM-40T2R be used as a direct replacement for DB2S40600L?

A: Yes. RB510SM-40T2R meets the critical substitution parameters: 40 V voltage rating, 100 mA current rating, SC-79 package, surface mount configuration, ROHS3 compliance, and MSL 1 classification. The lower forward voltage (480 mV @ 10 mA) represents improved performance. The higher maximum junction temperature (150°C) provides additional thermal margin.

Q: What is the difference between RB510SM-40T2R and RB510SM-40FHT2R?

A: Both parts share identical electrical specifications (40 V, 100 mA, 480 mV forward voltage). The RB510SM-40FHT2R carries AEC-Q101 automotive qualification, making it suitable for automotive applications. Selection between these parts depends on application requirements for automotive-grade components.

Q: Is CES388,L3F a better choice than RB510SM-40T2R?

A: CES388,L3F provides parametric equivalence to the original DB2S40600L with identical forward voltage (600 mV @ 100 mA) and reverse leakage (5 µA @ 40 V). RB510SM-40T2R offers improved forward voltage performance (480 mV @ 10 mA) and higher maximum junction temperature (150°C). Selection depends on whether the application benefits from lower forward voltage or requires exact parameter matching to the original part.

Q: Can RB521SM-40T2R be used in place of DB2S40600L?

A: Yes, with consideration for increased current capacity. RB521SM-40T2R meets voltage (40 V) and package requirements with doubled current rating (200 mA). This part is suitable for applications where the original 100 mA rating is adequate, as the higher rating provides design margin without adverse effects.

Q: Why is RB751SM-40T2R listed as a substitute if it has lower ratings?

A: RB751SM-40T2R is listed as a substitute for applications with reduced voltage and current requirements (30 V, 30 mA). This part is not suitable for the full DB2S40600L specification but may be used in circuit designs where lower voltage and current operation is acceptable.

Q: Are all substitute parts available in the same package as DB2S40600L?

A: Yes. All substitute parts listed use SC-79 or SOD-523 surface mount packages, ensuring mechanical and thermal compatibility with existing PCB layouts designed for the DB2S40600L.

Q: What compliance certifications apply to all substitute parts?

A: All substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity classification, matching the original DB2S40600L specifications. RB510SM-40FHT2R additionally carries AEC-Q101 automotive qualification.

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