MUR820 Equivalent & Substitute Parts Reference

Part Overview

The MUR820 is a general-purpose fast recovery rectifier diode rated for 200 V DC reverse voltage and 8 A average rectified current in a TO-220-2 through-hole package. Manufactured by onsemi under the SWITCHMODE™ series, this component is classified as obsolete product status. Due to its obsolete designation, equivalent and substitute parts from active manufacturers are necessary for new designs and ongoing production requirements. Substitute parts maintain electrical compatibility within specified parameter tolerances while offering active product status and improved compliance certifications.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) Maximum	200	V
Current - Average Rectified (Io)	8	A
Voltage - Forward (Vf) Maximum @ If	975 mV @ 8 A	mV @ A
Reverse Recovery Time (trr)	35	ns
Current - Reverse Leakage @ Vr	5	µA @ 200 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Mounting Type	Through Hole	—
Package / Case	TO-220-2	—
Operating Temperature - Junction	-65 to 175	°C

Substitute Part Grouping Explanation

Substitute parts for the MUR820 are classified based on strict electrical and mechanical parameter compatibility. The primary substitution criteria are:

Critical Parameters (Must Match):

Voltage - DC Reverse (Vr) Maximum: 200 V
Mounting Type: Through Hole
Package / Case: TO-220-2
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)

Compatible Parameters (Within Tolerance):

Current - Average Rectified (Io): 8 A or higher
Voltage - Forward (Vf) Maximum @ If: 975 mV or lower at rated current
Reverse Recovery Time (trr): 35 ns or lower
Current - Reverse Leakage @ Vr: 5 µA or lower at 200 V
Operating Temperature - Junction: -65°C to 175°C or equivalent range

Substitute parts are grouped into two categories:

Direct Equivalents: Parts with identical electrical specifications and active product status from the same or equivalent manufacturer series.

Similar Substitutes: Parts meeting all critical parameters with minor variations in forward voltage, reverse recovery time, or reverse leakage current within acceptable engineering tolerances for general-purpose rectification applications.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) V	Io A	Vf (Max) @ If mV	trr ns	Ir @ Vr µA	Product Status	RoHS Status	Package
MUR820	onsemi	200	8	975 @ 8A	35	5 @ 200V	Obsolete	Non-compliant	TO-220-2
MUR820G	onsemi	200	8	975 @ 8A	35	5 @ 200V	Active	ROHS3 Compliant	TO-220-2
VS-MUR820-M3	Vishay	200	8	975 @ 8A	35	5 @ 200V	Active	ROHS3 Compliant	TO-220-2
MUR820-BP	Micro Commercial Co	200	8	975 @ 8A	35	5 @ 200V	Active	Not specified	TO-220-2
STTH802D	STMicroelectronics	200	8	1050 @ 8A	30	6 @ 200V	Active	ROHS3 Compliant	TO-220-2
BYW29E-200,127	WeEn Semiconductors	200	8	1050 @ 8A	25	10 @ 200V	Active	ROHS3 Compliant	TO-220-2
SDUR820	SMC Diode Solutions	200	Not specified	1200 @ 8A	35	5 @ 200V	Active	ROHS3 Compliant	TO-220-2
STTH1202D	STMicroelectronics	200	12	1100 @ 12A	35	10 @ 200V	Active	ROHS3 Compliant	TO-220-2

Engineering Selection Recommendations

Tier 1 - Direct Equivalents (Preferred for Direct Replacement):

MUR820G (onsemi) and VS-MUR820-M3 (Vishay) are direct electrical equivalents with identical specifications to the MUR820. Both parts are active product status with ROHS3 compliance. MUR820G maintains onsemi manufacturer continuity. VS-MUR820-M3 provides Vishay FRED Pt® series reliability with equivalent performance. Both are suitable for direct substitution without circuit redesign.

Tier 2 - Compatible Substitutes (Acceptable with Parameter Verification):

STTH802D (STMicroelectronics) meets all critical parameters with minor variations: forward voltage 1050 mV (75 mV higher) and reverse recovery time 30 ns (5 ns faster). This part is active status with ROHS3 compliance and suitable for applications where the forward voltage increase is acceptable.

BYW29E-200,127 (WeEn Semiconductors) meets critical parameters with forward voltage 1050 mV and reverse recovery time 25 ns (faster). Reverse leakage current is 10 µA (higher than original). This part is active status with ROHS3 compliance. REACH status is affected; verify compliance requirements for end application.

MUR820-BP (Micro Commercial Co) provides identical electrical specifications with active status. Operating temperature range is -55°C to 150°C (narrower than original -65°C to 175°C). Suitable for applications within this temperature range.

Tier 3 - Higher Current Alternatives (For Upgraded Designs):

STTH1202D (STMicroelectronics) is rated for 12 A average rectified current at 200 V, providing 50% current margin over the 8 A requirement. Forward voltage is 1100 mV @ 12A. This part is active status with ROHS3 compliance and suitable for designs requiring increased current capacity or thermal margin.

Tier 4 - Limited Compatibility (Verify Before Use):

SDUR820 (SMC Diode Solutions) meets voltage and package requirements but forward voltage specification is 1200 mV @ 8A (225 mV higher than original). Average rectified current is not specified in provided data. Use only after verification that forward voltage increase does not impact circuit performance.

Compliance Considerations:

All substitute parts except MUR820-BP specify ROHS3 compliance status. The original MUR820 is RoHS non-compliant. For applications requiring RoHS compliance, select from MUR820G, VS-MUR820-M3, STTH802D, BYW29E-200,127, SDUR820, or STTH1202D.

Frequently Asked Questions (FAQ)

Q1: Can MUR820G be used as a direct replacement for MUR820?

A: Yes. MUR820G is manufactured by onsemi with identical electrical specifications: 200 V reverse voltage, 8 A average rectified current, 975 mV forward voltage @ 8A, and 35 ns reverse recovery time. MUR820G is active product status with ROHS3 compliance, making it the preferred direct replacement.

Q2: What is the difference between MUR820 and VS-MUR820-M3?

A: Both parts have identical electrical specifications and are rated for 200 V, 8 A, with 975 mV forward voltage and 35 ns reverse recovery time. The primary difference is manufacturer: MUR820 is onsemi, while VS-MUR820-M3 is Vishay FRED Pt® series. VS-MUR820-M3 is active status with ROHS3 compliance. Both are suitable for direct substitution.

Q3: Why does STTH802D have a lower reverse recovery time (30 ns) than MUR820 (35 ns)?

A: Reverse recovery time is a manufacturing characteristic that can vary between manufacturers and product lines while maintaining the same voltage and current ratings. STTH802D's 30 ns is within the fast recovery classification (≤ 500ns) and represents improved performance. The lower reverse recovery time reduces switching losses in rectification circuits.

Q4: Can STTH1202D replace MUR820 in all applications?

A: STTH1202D is rated for 12 A average rectified current compared to MUR820's 8 A. It meets the 200 V voltage requirement and fast recovery speed classification. The higher current rating provides design margin but does not prevent substitution. Verify that the forward voltage increase (1100 mV @ 12A vs. 975 mV @ 8A) is acceptable for your circuit.

Q5: What does "Fast Recovery ≤ 500ns, > 200mA (Io)" mean?

A: This classification indicates the diode is a fast recovery rectifier with reverse recovery time not exceeding 500 nanoseconds when switching currents greater than 200 mA. All listed substitute parts meet this classification, making them suitable for high-frequency rectification applications.

Q6: Is BYW29E-200,127 compatible with MUR820?

A: BYW29E-200,127 meets critical parameters: 200 V reverse voltage, 8 A current rating, TO-220-2 package, and fast recovery speed. Forward voltage is 1050 mV (75 mV higher) and reverse leakage is 10 µA (higher than MUR820's 5 µA). Compatibility depends on circuit tolerance for these parameter variations. Note: REACH status is affected; verify compliance for your application.

Q7: Why is SDUR820 listed as a similar substitute despite higher forward voltage (1200 mV)?

A: SDUR820 meets critical parameters: 200 V reverse voltage, TO-220-2 package, and fast recovery speed classification. The forward voltage specification of 1200 mV @ 8A is 225 mV higher than MUR820. This part is included as a similar substitute but requires verification that the forward voltage increase does not cause unacceptable voltage drop or heat dissipation in your specific application.

Q8: What is the significance of RoHS compliance status?

A: RoHS (Restriction of Hazardous Substances) compliance indicates the part meets environmental regulations restricting lead and other hazardous materials. MUR820 is RoHS non-compliant. All active substitute parts listed (MUR820G, VS-MUR820-M3, STTH802D, BYW29E-200,127, SDUR820, STTH1202D) are ROHS3 compliant, making them suitable for applications requiring environmental compliance.

Q9: Can I use MUR820-BP if my application requires -65°C operation?

A: MUR820-BP has an operating temperature range of -55°C to 150°C, which does not include -65°C. The original MUR820 is rated -65°C to 175°C. For applications requiring -65°C operation, select MUR820G, VS-MUR820-M3, or STTH802D, which all support -65°C minimum operating temperature.

Q10: What is the difference between TO-220-2 and TO-220AC package designations?

A: Both designations refer to the same TO-220 through-hole package with 2 leads. The package / case specification is TO-220-2 for all parts listed. Supplier device package designations (TO-220-2 vs. TO-220AC) may vary by manufacturer but represent the same physical package suitable for through-hole mounting on PCBs.

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