MMSD71RKT1 Equivalent & Substitute Parts Reference

Part Overview

The MMSD71RKT1 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 discontinuation from the manufacturer. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for applications utilizing this diode.

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
Technology	Standard	—
Speed Classification	Small Signal ≤ 200 mA (Io), Any Speed	—

Substitute Part Grouping Explanation

Substitution of the MMSD71RKT1 is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) rating must equal or exceed 80 V
Current - Average Rectified (Io) rating must equal or exceed 200 mA
Package / Case must be SOD-123 or compatible surface mount package
Reverse Recovery Time (trr) must be 4 ns or faster
Operating temperature range must encompass the application requirements

Substitute parts are grouped into two categories:

Category A: Direct Electrical Equivalents (80 V, ≥200 mA) Parts meeting or exceeding the 80 V and 200 mA specifications with SOD-123 packaging and matching recovery characteristics.

Category B: Uprated Electrical Equivalents (>80 V, ≥200 mA) Parts with higher voltage ratings (100 V) and higher current ratings (250–300 mA) that provide enhanced performance margins while maintaining SOD-123 or compatible packaging and fast recovery characteristics.

All substitute parts listed are active products with current manufacturing status and RoHS3 compliance, ensuring long-term availability and regulatory alignment.

Parameter Comparison

Parameter	MMSD71RKT1	1N4148WT	1N4148W-13-F	1N4148W-7-F	1N4448W-7-F	1N4448WQ-7-F	BAS16D-E3-08	BAS16H,115
Manufacturer	onsemi	Good-Ark Semiconductor	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated	Vishay General Semiconductor	NXP USA Inc.
Voltage - DC Reverse (Vr) (Max)	80 V	80 V	100 V	100 V	75 V	75 V	75 V	100 V
Current - Average Rectified (Io)	200 mA	125 mA	300 mA	300 mA	250 mA	250 mA	250 mA	215 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	1.25 V @ 150 mA
Reverse Recovery Time (trr)	4 ns	4 ns	4 ns	4 ns	4 ns	4 ns	6 ns	4 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	500 nA @ 80 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	1.5 pF @ 0 V, 1 MHz
Package / Case	SOD-123	SOD-523	SOD-123	SOD-123	SOD-123	SOD-123	SOD-123	SOD-123F
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	150 °C (Max)
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified
Automotive Grade / AEC-Q101	—	—	—	—	—	Yes	—	Yes

Engineering Selection Recommendations

For Direct Replacement (Preferred):

The 1N4148W-7-F and 1N4148W-13-F (both Diodes Incorporated) are the primary recommended substitutes. Both parts provide 100 V reverse voltage rating and 300 mA current capacity, exceeding the MMSD71RKT1 specifications. They maintain the SOD-123 package, 4 ns recovery time, and are RoHS3 compliant with active product status. The 1N4148W-7-F offers superior inventory availability (1,000,400 pcs) and is supplied in Tape & Reel format.

For Automotive Applications:

The 1N4448WQ-7-F (Diodes Incorporated, AEC-Q101 qualified) or BAS16H,115 (NXP USA Inc., AEC-Q101 qualified) are suitable for automotive-grade requirements. The 1N4448WQ-7-F provides 75 V / 250 mA ratings with automotive qualification. The BAS16H,115 offers 100 V / 215 mA with automotive qualification and matching reverse leakage characteristics (500 nA @ 80 V) to the original part.

For Voltage-Constrained Applications:

If the application circuit requires strict adherence to 80 V maximum reverse voltage, the 1N4148WT (Good-Ark Semiconductor) maintains the 80 V rating, though with reduced current capacity (125 mA). This part is suitable only for applications where the 200 mA current requirement can be reduced or where parallel configurations are feasible.

For High-Reliability Applications:

The BAS16D-E3-08 (Vishay General Semiconductor) provides 75 V / 250 mA with fast recovery characteristics and is available in Tape & Reel packaging. The slightly extended recovery time (6 ns vs. 4 ns) is acceptable for most general-purpose rectification applications.

All recommended substitutes are active products with current manufacturing status, ensuring long-term supply chain stability and regulatory compliance.

Frequently Asked Questions (FAQ)

Q1: Can the 1N4148WT be used as a direct replacement for the MMSD71RKT1?

The 1N4148WT matches the 80 V reverse voltage rating but provides only 125 mA average rectified current, compared to the MMSD71RKT1's 200 mA specification. This part is suitable only if the application circuit operates at or below 125 mA. For applications requiring the full 200 mA capacity, higher-rated substitutes such as the 1N4148W-7-F are required.

Q2: What is the difference between SOD-123 and SOD-523 packages?

SOD-123 and SOD-523 are both surface mount diode packages but differ in physical dimensions and pin configuration. The MMSD71RKT1 uses SOD-123. The 1N4148WT is supplied in SOD-523, which is not directly compatible with SOD-123 PCB layouts. Verify PCB footprint compatibility before selecting this part.

Q3: Why do some substitute parts have higher voltage ratings (100 V) than the original (80 V)?

Higher voltage ratings provide design margin and improved reliability in applications subject to transient overvoltages or thermal stress. Parts such as the 1N4148W-7-F (100 V) and BAS16H,115 (100 V) are fully backward-compatible with 80 V circuit requirements and offer enhanced performance headroom without functional compromise.

Q4: Are the 1N4448W-7-F and 1N4448WQ-7-F interchangeable?

Both parts share identical electrical specifications (75 V / 250 mA) and SOD-123 packaging. The primary difference is that the 1N4448WQ-7-F carries AEC-Q101 automotive qualification, making it suitable for automotive applications. For non-automotive applications, either part is acceptable; the 1N4448W-7-F offers significantly higher inventory availability (1,000,200 pcs vs. 5,961 pcs).

Q5: What does RoHS3 compliance mean for component selection?

RoHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. The MMSD71RKT1 is RoHS non-compliant (obsolete product). All recommended active substitutes are RoHS3 compliant, ensuring regulatory alignment for new designs and compliance with environmental standards in most jurisdictions.

Q6: Can the BAS16H,115 be used in place of the MMSD71RKT1?

Yes. The BAS16H,115 provides 100 V reverse voltage and 215 mA average rectified current, exceeding the MMSD71RKT1 specifications. It maintains the SOD-123F package (compatible with SOD-123 layouts), 4 ns recovery time, and includes AEC-Q101 automotive qualification. The reverse leakage characteristic (500 nA @ 80 V) matches the original part exactly.

Q7: What is the significance of reverse recovery time (trr) in diode selection?

Reverse recovery time determines how quickly the diode transitions from conducting to blocking state. Faster recovery (4 ns) reduces switching losses and electromagnetic interference in high-frequency applications. The MMSD71RKT1 specifies 4 ns; most recommended substitutes maintain this specification. The BAS16D-E3-08 has 6 ns recovery time, which is acceptable for general-purpose rectification but may introduce slightly higher switching losses in high-frequency circuits.

Q8: Which substitute offers the best inventory availability?

The 1N4148W-7-F (Diodes Incorporated) provides the highest inventory availability at 1,000,400 pcs. This part is supplied in Tape & Reel format and is recommended for high-volume production requirements or applications requiring immediate availability.

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