MMSD485B Equivalent & Substitute Parts

Part Overview

The MMSD485B is a general-purpose surface mount rectifier diode in SOD-123 package manufactured by onsemi. This component is classified as obsolete, indicating it is no longer in active production. The MMSD485B operates with a maximum junction temperature of 150°C and demonstrates standard recovery characteristics with speeds greater than 500 nanoseconds at currents exceeding 200mA. Due to its obsolete status, equivalent substitute parts are necessary for new designs and ongoing production requirements. All substitute options maintain SOD-123 package compatibility and general-purpose rectification functionality.

Key Parameters

Parameter	MMSD485B Value	Unit
Manufacturer	onsemi	—
Product Status	Obsolete	—
Package / Case	SOD-123	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction (Max)	150	°C
Speed Classification	Standard Recovery >500ns, > 200mA (Io)	—
Technology	Standard	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution eligibility for the MMSD485B is determined by the following critical parameters:

Primary Compatibility Criteria:

Package / Case: SOD-123 (mandatory)
Mounting Type: Surface Mount (mandatory)
Operating Temperature - Junction: 150°C maximum (mandatory)
RoHS Status: ROHS3 Compliant (mandatory)
Moisture Sensitivity Level: 1 (Unlimited) (mandatory)

Secondary Electrical Criteria:

Voltage - DC Reverse (Vr) (Max): 100 V or greater
Current - Average Rectified (Io): 200mA or greater
Speed Classification: Standard or faster recovery characteristics

All substitute parts listed maintain full compatibility with the mechanical and environmental requirements of the MMSD485B. Electrical parameters of substitutes meet or exceed the minimum specifications required for general-purpose rectification applications.

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage - DC Reverse (Vr) Max	Current - Average Rectified (Io)	Package / Case	Operating Temp - Junction (Max)	Speed Classification	RoHS Status
MMSD485B	onsemi	Obsolete	—	—	SOD-123	150°C	Standard Recovery >500ns, > 200mA	ROHS3 Compliant
MMSD4148T1G	onsemi	Active	100 V	200mA	SOD-123	150°C	Small Signal ≤ 200mA, Any Speed	ROHS3 Compliant
MMSD4148T3G	onsemi	Active	100 V	200mA	SOD-123	150°C	Small Signal ≤ 200mA, Any Speed	ROHS3 Compliant
MMSD914T1G	onsemi	Active	100 V	200mA	SOD-123	150°C	Small Signal ≤ 200mA, Any Speed	ROHS3 Compliant
MMSD914T3G	onsemi	Active	100 V	200mA	SOD-123	150°C	Small Signal ≤ 200mA, Any Speed	ROHS3 Compliant
1N4148W-13-F	Diodes Incorporated	Active	100 V	300mA	SOD-123	150°C	Fast Recovery ≤ 500ns, > 200mA	ROHS3 Compliant
1N4148W-7-F	Diodes Incorporated	Active	100 V	300mA	SOD-123	150°C	Fast Recovery ≤ 500ns, > 200mA	ROHS3 Compliant
BAS16D-E3-08	Vishay General Semiconductor - Diodes Division	Active	75 V	250mA	SOD-123	150°C	Fast Recovery ≤ 500ns, > 200mA	ROHS3 Compliant
BAV19W-7-F	Diodes Incorporated	Active	100 V	400mA	SOD-123	150°C	Small Signal ≤ 200mA, Any Speed	ROHS3 Compliant
BAV19W-G3-08	Vishay General Semiconductor - Diodes Division	Active	100 V	250mA	SOD-123	150°C	Fast Recovery ≤ 500ns, > 200mA	ROHS3 Compliant
BAV19W-G3-18	Vishay General Semiconductor - Diodes Division	Active	100 V	250mA	SOD-123	150°C	Fast Recovery ≤ 500ns, > 200mA	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

The MMSD4148T1G, MMSD4148T3G, MMSD914T1G, and MMSD914T3G are direct onsemi alternatives with identical electrical specifications (100 V reverse voltage, 200mA average rectified current) and matching thermal characteristics (150°C maximum junction temperature). These parts are in active production status and carry ROHS3 compliance. The primary distinction between these options is packaging format: T1G variants use Cut Tape (CT) & Digi-Reel® packaging, while T3G variants use Tape & Reel (TR) packaging. Selection between these should be based on procurement and assembly line requirements.

Secondary Substitutes (Expanded Current Capability):

The 1N4148W-13-F and 1N4148W-7-F from Diodes Incorporated provide higher average rectified current (300mA) and faster recovery characteristics (Fast Recovery ≤ 500ns, > 200mA) compared to the MMSD485B. These parts maintain 100 V reverse voltage rating and 150°C maximum junction temperature. The distinction between these two is packaging format: 13-F uses Cut Tape (CT) & Digi-Reel® packaging, while 7-F also uses Cut Tape (CT) & Digi-Reel® packaging with higher inventory availability.

Tertiary Substitutes (Voltage-Reduced Applications):

The BAS16D-E3-08 from Vishay operates at 75 V maximum reverse voltage with 250mA average rectified current. This part is suitable for applications where the 100 V rating of other substitutes exceeds system requirements. It features fast recovery characteristics and maintains 150°C maximum junction temperature.

Alternative Substitutes (Current-Enhanced Options):

The BAV19W-7-F from Diodes Incorporated and BAV19W-G3-08 and BAV19W-G3-18 from Vishay provide 250mA to 400mA average rectified current ratings. The BAV19W-7-F offers the highest current capability (400mA) with 100 V reverse voltage. The Vishay variants (BAV19W-G3-08 and BAV19W-G3-18) provide 250mA current with fast recovery characteristics. All maintain 150°C maximum junction temperature and ROHS3 compliance.

All listed substitutes are in active production status, ensuring long-term availability and supply chain stability compared to the obsolete MMSD485B.

Frequently Asked Questions (FAQ)

Q: Why is the MMSD485B listed as obsolete?

A: The MMSD485B has been discontinued by onsemi and is no longer manufactured. Obsolete status indicates the part is no longer available from the manufacturer for new orders. Substitute parts in active production status must be used for new designs and ongoing production.

Q: Can I use any of the listed substitutes as a direct replacement?

A: All listed substitutes maintain SOD-123 package compatibility and surface mount mounting type, allowing direct physical replacement on printed circuit boards. However, electrical parameter differences must be evaluated for specific application requirements. Parts with equal or higher voltage and current ratings are generally suitable for applications designed for the MMSD485B.

Q: What is the difference between Cut Tape (CT) & Digi-Reel® and Tape & Reel (TR) packaging?

A: Both packaging formats contain the same electronic component but differ in presentation for assembly. Cut Tape (CT) & Digi-Reel® packaging is suitable for lower-volume production and manual assembly processes. Tape & Reel (TR) packaging is optimized for high-volume automated assembly lines. Selection depends on manufacturing process requirements and production volume.

Q: Are all substitutes RoHS3 compliant?

A: Yes, all listed substitute parts carry ROHS3 Compliant certification, matching the compliance status of the MMSD485B. All parts also maintain Moisture Sensitivity Level 1 (Unlimited) rating.

Q: What is the difference between Standard Recovery and Fast Recovery speed classifications?

A: Standard Recovery diodes have reverse recovery times greater than 500 nanoseconds and are suitable for general-purpose rectification at lower switching frequencies. Fast Recovery diodes have reverse recovery times of 500 nanoseconds or less and are suitable for higher-frequency switching applications. The MMSD485B uses Standard Recovery characteristics. Substitutes with Fast Recovery characteristics provide improved performance in high-frequency applications while remaining compatible with Standard Recovery applications.

Q: Which substitute offers the best overall compatibility with the MMSD485B?

A: The MMSD914T1G and MMSD914T3G from onsemi provide the closest electrical and thermal match to the MMSD485B, with identical 100 V reverse voltage, 200mA average rectified current, and 150°C maximum junction temperature. These parts are manufactured by the same company as the original part and are in active production status.

Q: Can I use a substitute with higher current rating than the MMSD485B?

A: Yes. Substitutes with higher current ratings (such as the 1N4148W series at 300mA or BAV19W-7-F at 400mA) are suitable for applications designed for the MMSD485B. Higher current capability provides design margin and does not negatively impact circuit performance in applications requiring lower current levels.

Q: What should I consider when selecting between multiple substitutes?

A: Selection should be based on: (1) packaging format requirements (Cut Tape vs. Tape & Reel), (2) electrical parameter margins needed for the application, (3) supply chain availability and lead times, (4) cost considerations, and (5) manufacturer preference for supply chain consistency. All listed substitutes meet the mandatory mechanical and environmental requirements of the MMSD485B.

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