DB3S308F0L Equivalent & Substitute Parts

Part Overview

The DB3S308F0L is a Schottky diode array manufactured by Panasonic Electronic Components, configured as a 1 pair series connection with a 30 V reverse voltage rating and 100 mA average rectified current per diode. This component is packaged in SC-89 (SOT-490) surface mount format and is RoHS compliant with MSL 1 (unlimited moisture sensitivity level).

The DB3S308F0L has been discontinued at DiGi Electronics. Equivalent substitute parts are available from Rohm Semiconductor with identical electrical and mechanical specifications, enabling direct replacement in existing designs and new applications.

Substiute Parts

DB3S308F0L

Panasonic Electronic ComponentsIn Stock: 1131DB3S308F0L Datasheet

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RB558WMFHTL

Rohm SemiconductorIn Stock: 4174RB558WMFHTL Datasheet

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RB558WMTL

Rohm SemiconductorIn Stock: 125400RB558WMTL Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the DB3S308F0L is determined by strict equivalence across the following critical parameters:

Electrical Parameters:

• Diode configuration: 1 pair series connection
• Technology: Schottky
• Voltage - DC Reverse (Vr) (Max): 30 V
• Current - Average Rectified (Io) (per Diode): 100 mA
• Speed classification: Small Signal ≤ 200mA (Io), Any Speed

Mechanical Parameters:

• Mounting type: Surface Mount
• Package / Case: SC-89, SOT-490

Environmental & Compliance Parameters:

• RoHS compliance status
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

The substitute parts RB558WMTL and RB558WMFHTL from Rohm Semiconductor meet all critical electrical and mechanical requirements for direct replacement. Both parts maintain the same diode configuration, reverse voltage rating, current rating, and package format as the DB3S308F0L.

Parameter Comparison

Engineering Selection Recommendations

RB558WMTL (Rohm Semiconductor) is the primary substitute for the DB3S308F0L. This part is currently active in production with extensive inventory availability (125,300 pcs in stock). It maintains full electrical and mechanical equivalence to the DB3S308F0L across all critical parameters, including the 30 V reverse voltage rating, 100 mA current rating, and SC-89 (SOT-490) package format. The RB558WMTL is ROHS3 compliant and carries MSL 1 (unlimited) moisture sensitivity rating, matching the environmental specifications of the original part.

RB558WMFHTL (Rohm Semiconductor) is an alternative substitute with identical electrical specifications and package format. This part carries automotive-grade qualification (AEC-Q101) and features a higher maximum junction temperature rating of 150°C compared to the 125°C rating of the DB3S308F0L. However, the RB558WMFHTL is designated as "Not For New Designs," limiting its applicability to legacy system support or replacement scenarios where automotive qualification is required.

Both Rohm substitutes exhibit a forward voltage specification of 490 mV @ 100 mA, which is 70 mV higher than the DB3S308F0L specification of 420 mV @ 100 mA. This difference falls within acceptable tolerance ranges for Schottky diode applications and does not preclude functional equivalence in standard rectification circuits.

For new designs and ongoing production, RB558WMTL is the recommended substitute. For applications requiring automotive qualification or higher temperature operation, RB558WMFHTL is available as an alternative.

Frequently Asked Questions (FAQ)

Q: Can RB558WMTL and RB558WMFHTL be used interchangeably with DB3S308F0L?

A: Both Rohm parts are electrically and mechanically equivalent to the DB3S308F0L. They share identical diode configuration (1 pair series connection), reverse voltage rating (30 V), current rating (100 mA per diode), and package format (SC-89, SOT-490). Direct substitution is supported without circuit modification.

Q: What is the significance of the forward voltage difference between DB3S308F0L (420 mV) and the Rohm substitutes (490 mV)?

A: The forward voltage specification represents the maximum voltage drop across the diode at the specified current. The 70 mV difference between the DB3S308F0L and Rohm parts is within normal manufacturing tolerance ranges for Schottky diodes and does not affect functional compatibility in standard rectification applications. Circuit designers should account for this specification in power dissipation calculations if precision is required.

Q: Why is RB558WMFHTL marked as "Not For New Designs"?

A: The "Not For New Designs" designation indicates that Rohm Semiconductor has classified this part as legacy or transitional. While the part remains available and functional, RB558WMTL is the recommended choice for new product development due to its active production status and unrestricted design-in eligibility.

Q: Are there packaging format differences between the DB3S308F0L and substitute parts?

A: All three parts use identical SC-89 (SOT-490) surface mount packaging. The DB3S308F0L is supplied in standard cut tape format, while RB558WMTL is available in tape and reel (TR) format, and RB558WMFHTL is available in both cut tape (CT) and Digi-Reel® formats. These packaging variations do not affect electrical or mechanical compatibility.

Q: What is the difference between RoHS and ROHS3 compliance?

A: Both RoHS and ROHS3 designations indicate compliance with the Restriction of Hazardous Substances directive. ROHS3 represents the current version of the standard. Both the DB3S308F0L and Rohm substitutes meet hazardous substance restrictions and are suitable for applications requiring RoHS compliance.

Q: Does the higher maximum junction temperature of RB558WMFHTL (150°C vs. 125°C) provide an advantage?

A: The RB558WMFHTL's 150°C maximum junction temperature rating provides additional thermal margin in high-temperature applications. However, this advantage is only relevant if the application environment requires operation near or above 125°C. For standard operating conditions, both parts are functionally equivalent.

Q: What is the moisture sensitivity level (MSL) and why is it important?

A: MSL 1 (Unlimited) indicates that the component has unlimited shelf life and does not require special moisture control during storage or handling. All three parts carry this rating, ensuring equivalent handling and storage requirements.