MMSD71RKT1G Equivalent & Substitute Parts

Part Overview

The MMSD71RKT1G is a general-purpose rectifier diode manufactured by onsemi, rated for 80 V DC reverse voltage and 200 mA average rectified current in a surface mount SOD-123 package. This component is classified as obsolete, indicating discontinued production and limited availability for new designs. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production requirements for applications utilizing this diode specification.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	80	V
Current - Average Rectified (Io)	200	mA
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 100 mA	V
Reverse Recovery Time (trr)	4	ns
Current - Reverse Leakage @ Vr	500 nA @ 80 V	nA
Capacitance @ Vr, F	2 pF @ 0.5 V, 1 MHz	pF
Package / Case	SOD-123	—
Operating Temperature - Junction	-55 to 150	°C
Mounting Type	Surface Mount	—
Technology	Standard	—
Speed Classification	Small Signal ≤ 200 mA (Io), Any Speed	—

Substitute Part Grouping Explanation

Substitute parts for the MMSD71RKT1G are selected based on electrical and mechanical compatibility within the following criteria:

Primary Substitution Parameters:

Voltage - DC Reverse (Vr) (Max): Equal to or greater than 80 V
Current - Average Rectified (Io): Equal to or greater than 200 mA
Package / Case: SOD-123 or compatible surface mount package
Mounting Type: Surface Mount
Technology: Standard rectifier diode technology
Operating Temperature Range: Encompassing or exceeding -55°C to 150°C

Secondary Compatibility Factors:

Reverse Recovery Time (trr): 4 ns or faster
Forward Voltage (Vf): Comparable performance at rated current
Reverse Leakage Current: Acceptable for application requirements
Moisture Sensitivity Level (MSL): Level 1 (Unlimited)
REACH and RoHS Compliance: Regulatory alignment with original part

Substitute parts meeting these criteria maintain functional equivalence for general-purpose rectification applications while accommodating active product availability and supply chain continuity.

Parameter Comparison

Parameter	MMSD71RKT1G (Main)	1N4148WT	1N4148W-13-F	1N4148W-7-F	1N4448W-7-F	1N4448WQ-7-F	BAS16D-E3-08
Manufacturer	onsemi	Good-Ark Semiconductor	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated	Vishay General Semiconductor
Voltage - DC Reverse (Vr) (Max)	80 V	80 V	100 V	100 V	75 V	75 V	75 V
Current - Average Rectified (Io)	200 mA	125 mA	300 mA	300 mA	250 mA	250 mA	250 mA
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 100 mA	1 V @ 50 mA	1.25 V @ 150 mA	1.25 V @ 150 mA	1.25 V @ 150 mA	1.25 V @ 150 mA	1.25 V @ 150 mA
Reverse Recovery Time (trr)	4 ns	4 ns	4 ns	4 ns	4 ns	4 ns	6 ns
Current - Reverse Leakage @ Vr	500 nA @ 80 V	1 µA @ 75 V	1 µA @ 100 V	1 µA @ 100 V	2.5 µA @ 75 V	25 nA @ 20 V	1 µA @ 75 V
Capacitance @ Vr, F	2 pF @ 0.5 V, 1 MHz	2 pF @ 0 V, 1 MHz	2 pF @ 0 V, 1 MHz	2 pF @ 0 V, 1 MHz	4 pF @ 0 V, 1 MHz	4 pF @ 0 V, 1 MHz	2 pF @ 0 V, 1 MHz
Package / Case	SOD-123	SOD-523	SOD-123	SOD-123	SOD-123	SOD-123	SOD-123
Operating Temperature - Junction	-55 to 150 °C	-65 to 150 °C	-55 to 150 °C	-55 to 150 °C	-65 to 150 °C	-65 to 150 °C	-55 to 150 °C
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

The 1N4148W-7-F and 1N4148W-13-F from Diodes Incorporated provide the most direct electrical substitution for the MMSD71RKT1G. Both parts exceed the original voltage specification (100 V vs. 80 V), support higher current capacity (300 mA vs. 200 mA), maintain identical reverse recovery time (4 ns), and are packaged in SOD-123. These parts are active products with ROHS3 compliance and extensive inventory availability (1,000,400 and 2,328 units respectively). The SOD-123 package maintains mechanical compatibility with existing PCB layouts.

Secondary Substitutes (Voltage-Reduced Applications):

The 1N4448W-7-F, 1N4448WQ-7-F, and BAS16D-E3-08 are suitable for applications where the 80 V reverse voltage specification can be reduced to 75 V. These parts support 250 mA current capacity, maintain 4 ns reverse recovery time (6 ns for BAS16D-E3-08), and are available in SOD-123 packages. The 1N4448WQ-7-F includes AEC-Q101 automotive qualification and demonstrates superior reverse leakage characteristics (25 nA @ 20 V). All three parts are active products with ROHS3 compliance.

Current-Limited Substitute (Restricted Application):

The 1N4148WT from Good-Ark Semiconductor operates at 80 V reverse voltage matching the original specification but is limited to 125 mA average rectified current. This part is suitable only for applications where current demand does not exceed 125 mA. The SOD-523 package differs from the original SOD-123, requiring PCB layout modification. This part is active with extensive inventory (301,175 units).

Compliance and Availability:

All substitute parts maintain MSL Level 1 (Unlimited) moisture sensitivity, REACH compliance, and EAR99 export classification consistent with the original part. Active product status ensures long-term supply chain reliability and continued manufacturing support, addressing the obsolescence limitation of the MMSD71RKT1G.

Frequently Asked Questions (FAQ)

Q: Can the 1N4148W-7-F directly replace the MMSD71RKT1G in existing designs?

A: The 1N4148W-7-F is electrically compatible for direct substitution. It maintains the same SOD-123 package, exceeds voltage and current specifications, and provides identical reverse recovery time. No circuit modifications are required for applications operating within the original 80 V and 200 mA parameters.

Q: What is the primary difference between the 1N4448W-7-F and 1N4148W-7-F substitutes?

A: The 1N4448W-7-F operates at a maximum reverse voltage of 75 V compared to 100 V for the 1N4148W-7-F. Both support 250 mA current and maintain identical reverse recovery time. Selection depends on whether the application requires the full 80 V specification or can operate within 75 V limits.

Q: Is the 1N4148WT suitable as a substitute despite lower current rating?

A: The 1N4148WT is suitable only for applications where average rectified current does not exceed 125 mA. For designs requiring the full 200 mA specification, this part is not appropriate. Additionally, the SOD-523 package differs from the original SOD-123, requiring PCB layout changes.

Q: Why does the BAS16D-E3-08 have a longer reverse recovery time than other substitutes?

A: The BAS16D-E3-08 specifies 6 ns reverse recovery time compared to 4 ns for other substitutes. This 2 ns difference remains within acceptable limits for general-purpose rectification applications. The part is suitable for non-critical timing applications where this specification variance does not impact circuit performance.

Q: Are all substitute parts RoHS compliant?

A: All substitute parts listed are ROHS3 compliant. The original MMSD71RKT1G does not specify RoHS status. Substitution with ROHS3-compliant parts ensures regulatory alignment with current environmental and manufacturing standards.

Q: What is the significance of the 1N4448WQ-7-F automotive qualification?

A: The 1N4448WQ-7-F carries AEC-Q101 automotive qualification, indicating validation for automotive-grade applications. This certification is relevant only for designs requiring automotive-level reliability and quality assurance. Non-automotive applications can use any listed substitute meeting electrical specifications.

Q: Can package differences between SOD-123 and SOD-523 affect substitution?

A: Yes. The 1N4148WT uses SOD-523 packaging while the original MMSD71RKT1G and most substitutes use SOD-123. SOD-523 has different pin spacing and footprint dimensions, requiring PCB layout modification. Direct PCB substitution is not possible without redesign.

Q: How does reverse leakage current variation affect substitute selection?

A: Reverse leakage current differences (ranging from 25 nA to 2.5 µA across substitutes) are acceptable for general-purpose rectification. Applications with strict leakage requirements should reference specific part datasheets. The 1N4448WQ-7-F demonstrates the lowest leakage at 25 nA @ 20 V.

Q: What inventory considerations apply to substitute selection?

A: The 1N4148W-7-F offers the highest inventory availability (1,000,400 units), ensuring long-term supply reliability. The 1N4148WT (301,175 units) and 1N4448W-7-F (1,000,200 units) also provide substantial stock. Lower-inventory parts such as 1N4148W-13-F (2,328 units) and BAS16D-E3-08 (2,380 units) remain available but with reduced supply depth.

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