MMSD103T1 Equivalent & Substitute Parts

Part Overview

The MMSD103T1 is a general-purpose rectifier diode manufactured by onsemi, rated for 250 V DC reverse voltage and 200 mA average rectified current in a surface mount SOD-123 package. This component is classified as obsolete, which necessitates identification of active equivalent and substitute parts for ongoing design requirements and procurement needs. The part operates across a junction temperature range of -55°C to 150°C and exhibits a maximum forward voltage of 1.25 V at 200 mA with a reverse recovery time of 50 ns.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	250	V
Current - Average Rectified (Io)	200	mA
Voltage - Forward (Vf) (Max) @ If	1.25 V @ 200 mA	V
Reverse Recovery Time (trr)	50	ns
Current - Reverse Leakage @ Vr	1 µA @ 200 V	µA
Capacitance @ Vr, F	5 pF @ 0V, 1MHz	pF
Package / Case	SOD-123	—
Operating Temperature - Junction	-55 to 150	°C
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitution of the MMSD103T1 is determined by electrical and mechanical compatibility across the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 250 V
Current - Average Rectified (Io): Must equal or exceed 200 mA
Package / Case: Must be SOD-123 surface mount
Mounting Type: Must be surface mount
Reverse Recovery Time (trr): Must equal or be faster than 50 ns
Operating Temperature Range: Must accommodate -55°C to 150°C junction temperature

Substitution Categories:

Direct Equivalent: Parts with identical electrical specifications (250 V, 200 mA) and active product status.

Parametric Equivalent: Parts with identical or superior electrical specifications but potentially different packaging options or manufacturer.

Similar/Downrated Substitute: Parts with reduced voltage or current ratings that may be suitable for applications with lower electrical demands, provided all other parameters remain compatible.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [mA]	Vf (Max) @ If [V]	trr [ns]	Ir @ Vr [µA/nA]	Package	Product Status	RoHS Status
MMSD103T1	onsemi	250	200	1.25 @ 200 mA	50	1 µA @ 200 V	SOD-123	Obsolete	Non-compliant
MMSD103T1G	onsemi	250	200	1.25 @ 200 mA	50	1 µA @ 200 V	SOD-123	Active	ROHS3 Compliant
SMMSD103T1G	onsemi	250	200	1.25 @ 200 mA	50	1 µA @ 200 V	SOD-123	Active	ROHS3 Compliant
BAV21W	Good-Ark Semiconductor	200	200	1.25 @ 200 mA	50	100 nA @ 200 V	SOD-123	Active	ROHS3 Compliant
BAV21W-7-F	Diodes Incorporated	200	400	1.25 @ 200 mA	50	100 nA @ 200 V	SOD-123	Active	ROHS3 Compliant
BAV21W-TP	Micro Commercial Co	200	200	1.25 @ 200 mA	50	100 nA @ 200 V	SOD-123	Active	ROHS3 Compliant
MMSD3070	onsemi	200	200	1 @ 100 mA	50	100 nA @ 175 V	SOD-123	Active	ROHS3 Compliant
GSD2004W-E3-08	Vishay General Semiconductor - Diodes Division	240	225	1 @ 100 mA	50	100 nA @ 240 V	SOD-123	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalent Selection:

MMSD103T1G and SMMSD103T1G are direct electrical equivalents to the obsolete MMSD103T1, maintaining identical specifications for reverse voltage (250 V), average rectified current (200 mA), forward voltage (1.25 V @ 200 mA), and reverse recovery time (50 ns). Both parts are manufactured by onsemi and are ROHS3 compliant, addressing regulatory requirements absent in the original part. MMSD103T1G is available in Cut Tape and Digi-Reel packaging with 65,200 units in stock, while SMMSD103T1G is supplied in Tape & Reel format with 9,907 units available. Selection between these two should be based on packaging and inventory requirements.

Parametric Equivalent Selection:

GSD2004W-E3-08 (Vishay) provides near-equivalent performance with 240 V reverse voltage rating and 225 mA average rectified current, exceeding the original 200 mA specification. This part maintains the 50 ns reverse recovery time and SOD-123 package format. The reduced forward voltage (1 V @ 100 mA) and lower reverse leakage current (100 nA @ 240 V) represent improved electrical characteristics. This part is ROHS3 compliant with 19,500 units in stock.

Downrated Substitute Selection:

BAV21W (Good-Ark Semiconductor), BAV21W-7-F (Diodes Incorporated), and BAV21W-TP (Micro Commercial Co) are rated for 200 V reverse voltage, which is 50 V below the original MMSD103T1 specification. These parts are suitable only for applications where the actual reverse voltage stress does not exceed 200 V. BAV21W-7-F provides enhanced current capability at 400 mA. All three variants are ROHS3 compliant and maintain the 50 ns reverse recovery time and SOD-123 package.

MMSD3070 (onsemi) is similarly downrated to 200 V reverse voltage with 200 mA current rating. This part exhibits improved forward voltage characteristics (1 V @ 100 mA) and lower reverse leakage current (100 nA @ 175 V). ROHS3 compliance and 518,300 units in stock provide high availability.

Compliance and Regulatory Status:

All recommended substitute parts are ROHS3 compliant, addressing environmental and regulatory requirements. The original MMSD103T1 is marked as RoHS non-compliant, making transition to compliant alternatives necessary for new designs and procurement cycles.

Frequently Asked Questions (FAQ)

Q: Can MMSD103T1G be used as a direct replacement for MMSD103T1?

A: Yes. MMSD103T1G is electrically and mechanically identical to MMSD103T1, with identical reverse voltage (250 V), average rectified current (200 mA), forward voltage (1.25 V @ 200 mA), and reverse recovery time (50 ns). The primary difference is product status: MMSD103T1G is active and ROHS3 compliant, whereas MMSD103T1 is obsolete and non-compliant. Both use SOD-123 surface mount packaging.

Q: What is the difference between MMSD103T1G and SMMSD103T1G?

A: Both parts are electrically identical with 250 V reverse voltage and 200 mA current rating. The difference is packaging format: MMSD103T1G is supplied in Cut Tape and Digi-Reel format, while SMMSD103T1G is supplied in Tape & Reel format. Selection depends on assembly line requirements and inventory management preferences.

Q: Can BAV21W parts be used in place of MMSD103T1?

A: BAV21W variants (including BAV21W, BAV21W-7-F, and BAV21W-TP) are rated for 200 V reverse voltage, which is 50 V lower than the MMSD103T1 specification of 250 V. These parts are suitable only for applications where the actual reverse voltage stress does not exceed 200 V. All three variants maintain the 200 mA current rating and 50 ns reverse recovery time in SOD-123 packaging.

Q: Is GSD2004W-E3-08 a suitable substitute?

A: GSD2004W-E3-08 (Vishay) provides near-equivalent performance with 240 V reverse voltage and 225 mA average rectified current, both exceeding the original 200 mA specification. The 10 V reduction in reverse voltage rating (from 250 V to 240 V) may be acceptable depending on circuit design margins. This part maintains SOD-123 packaging and 50 ns reverse recovery time. Improved electrical characteristics include lower forward voltage (1 V @ 100 mA) and reduced reverse leakage current (100 nA @ 240 V).

Q: What does "RoHS3 Compliant" mean for component selection?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. The original MMSD103T1 is marked as RoHS non-compliant. For new designs and procurement in regulated markets, ROHS3-compliant alternatives such as MMSD103T1G, SMMSD103T1G, and all BAV21W variants are required.

Q: Can MMSD3070 replace MMSD103T1?

A: MMSD3070 is rated for 200 V reverse voltage, which is 50 V below MMSD103T1. This part is suitable only for applications where reverse voltage stress does not exceed 200 V. Both parts maintain 200 mA current rating, 50 ns reverse recovery time, and SOD-123 packaging. MMSD3070 exhibits improved forward voltage (1 V @ 100 mA) and lower reverse leakage current (100 nA @ 175 V).

Q: What packaging options are available for direct equivalents?

A: MMSD103T1G is available in Cut Tape (CT) and Digi-Reel packaging with 65,200 units in stock. SMMSD103T1G is available in Tape & Reel (TR) format with 9,907 units in stock. Both are SOD-123 surface mount packages suitable for automated assembly processes.

Q: How do reverse recovery time specifications affect substitution?

A: All recommended substitute parts maintain the 50 ns reverse recovery time specification of the original MMSD103T1. This parameter determines switching speed and is critical for high-frequency applications. Parts with identical or faster reverse recovery times are suitable substitutes from this perspective.

Q: Are there inventory considerations for part selection?

A: MMSD3070 has the highest inventory availability at 518,300 units, followed by BAV21W at 365,200 units. MMSD103T1G provides 65,200 units, GSD2004W-E3-08 provides 19,500 units, and SMMSD103T1G provides 9,907 units. Inventory levels may influence procurement decisions for high-volume applications.

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