MUR820 Equivalent & Substitute Parts

Part Overview

The MUR820 is a general-purpose rectifier diode rated for 200 V DC reverse voltage and 8 A average rectified current in a through-hole TO-220AC package. Manufactured by Vishay General Semiconductor - Diodes Division, this component is classified as obsolete. Due to its obsolete status and limited availability from the original manufacturer, equivalent substitute parts from active manufacturers are necessary for new designs and ongoing production requirements. Substitute diodes must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating packaging variations.

Key Parameters

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

Substitute Part Grouping Explanation

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

Critical Parameters for Substitution:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 200 V
Current - Average Rectified (Io): Must equal or exceed 8 A
Mounting Type: Must be Through Hole
Package / Case: Must be TO-220-2 or compatible TO-220AC variant
Speed Classification: Must be Fast Recovery ≤ 500ns, > 200mA (Io)

Substitution Categories:

Direct Electrical Equivalents (8 A Rating): Parts meeting all electrical specifications at the 8 A current rating with identical or superior performance characteristics.

Upgraded Current Rating (12 A Rating): Parts exceeding the 8 A requirement with 12 A capability, suitable for applications where higher current capacity provides design margin without electrical incompatibility.

All substitute parts listed maintain the 200 V reverse voltage specification and fast recovery speed classification required for the MUR820 application.

Parameter Comparison

Parameter	MUR820 (Vishay)	MUR820G (onsemi)	MUR820-BP (Micro Commercial Co)	STTH802D (STMicroelectronics)	STTH1202D (STMicroelectronics)
Voltage - DC Reverse (Vr) (Max)	200 V	200 V	200 V	200 V	200 V
Current - Average Rectified (Io)	8 A	8 A	8 A	8 A	12 A
Voltage - Forward (Vf) (Max) @ If	975 mV @ 8 A	975 mV @ 8 A	975 mV @ 8 A	1.05 V @ 8 A	1.1 V @ 12 A
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Reverse Recovery Time (trr)	35 ns	35 ns	35 ns	30 ns	35 ns
Current - Reverse Leakage @ Vr	5 µA @ 200 V	5 µA @ 200 V	5 µA @ 200 V	6 µA @ 200 V	10 µA @ 200 V
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-220-2	TO-220-2	TO-220-2	TO-220-2	TO-220-2
Operating Temperature - Junction	-65°C ~ 175°C	-65°C ~ 175°C	-55°C ~ 150°C	175°C (Max)	175°C (Max)
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

MUR820G (onsemi): This part is the primary direct equivalent, offering identical electrical specifications to the MUR820 across all critical parameters. The MUR820G is manufactured by onsemi under the SWITCHMODE™ series and maintains active product status with ROHS3 compliance. Operating temperature range matches the original specification (-65°C ~ 175°C). This substitute is suitable for direct replacement in existing designs.

MUR820-BP (Micro Commercial Co): This part provides electrical equivalence with identical voltage, current, and forward voltage specifications. The MUR820-BP is active and available in bulk packaging. The operating temperature range is reduced to -55°C ~ 150°C compared to the original -65°C ~ 175°C specification. This substitute is applicable for applications operating within the -55°C to 150°C junction temperature range.

STTH802D (STMicroelectronics): This part meets the 8 A current requirement with 200 V reverse voltage rating. The STTH802D exhibits superior reverse recovery time performance (30 ns versus 35 ns) and is ROHS3 compliant with active product status. Forward voltage is slightly elevated at 1.05 V @ 8 A compared to 975 mV. Operating temperature maximum is 175°C. This substitute is suitable for applications where improved switching performance is beneficial.

STTH1202D (STMicroelectronics): This part provides upgraded current capacity at 12 A while maintaining the 200 V reverse voltage specification. The STTH1202D is ROHS3 compliant and active. Forward voltage is 1.1 V @ 12 A. This substitute is applicable for designs requiring higher current margin or where 12 A capability is specified.

Frequently Asked Questions (FAQ)

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

A: Yes. The MUR820G maintains identical electrical specifications including 200 V reverse voltage, 8 A average rectified current, 975 mV forward voltage at 8 A, and 35 ns reverse recovery time. Operating temperature range is identical (-65°C ~ 175°C). The MUR820G is active and ROHS3 compliant, making it the primary direct substitute.

Q: What is the difference between MUR820-BP and MUR820G?

A: Both parts meet the core electrical specifications of 200 V, 8 A, and 975 mV forward voltage. The primary difference is operating temperature range: MUR820-BP is rated -55°C ~ 150°C, while MUR820G is rated -65°C ~ 175°C. MUR820-BP is suitable for applications within the reduced temperature range.

Q: Can STTH1202D replace MUR820 in all applications?

A: STTH1202D is electrically compatible with MUR820 for the 200 V reverse voltage and fast recovery speed requirements. However, STTH1202D is rated for 12 A average rectified current versus 8 A for MUR820. This higher current rating does not create incompatibility; it provides additional design margin. Forward voltage is slightly higher at 1.1 V @ 12 A. STTH1202D is suitable for applications where the 8 A specification is a maximum operating point.

Q: What is the significance of the TO-220AC versus TO-220-2 package designation?

A: TO-220AC and TO-220-2 refer to the same physical package form factor with two leads. The designations are manufacturer-specific nomenclature for the identical through-hole package. All listed substitutes are mechanically compatible in TO-220-2 or TO-220AC configurations.

Q: Are all substitute parts ROHS3 compliant?

A: MUR820G and STTH802D are explicitly ROHS3 compliant. MUR820-BP compliance status is not specified in the provided data. STTH1202D is ROHS3 compliant. The original MUR820 is RoHS non-compliant. For applications requiring ROHS3 compliance, MUR820G, STTH802D, and STTH1202D are suitable selections.

Q: How does reverse recovery time affect substitution?

A: All substitute parts maintain the fast recovery classification (≤ 500ns, > 200mA). STTH802D offers improved performance at 30 ns versus the 35 ns specification of MUR820. Faster reverse recovery time reduces switching losses and improves efficiency in rectifier applications. This performance improvement does not create incompatibility.

Q: Can MUR820-BP be used in applications requiring -65°C operation?

A: No. MUR820-BP is rated for -55°C minimum junction temperature, while MUR820 and MUR820G are rated to -65°C. For applications requiring -65°C operation, use MUR820G or STTH802D.

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