MURS320T3 Equivalent & Substitute Parts

Part Overview

The MURS320T3 is an ultrafast recovery rectifier diode manufactured by onsemi, rated for 200 V DC reverse voltage and 4 A average rectified current in a surface mount SMC (DO-214AB) package. This component is classified as obsolete, indicating that direct procurement from the original manufacturer is no longer available. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for production and repair applications.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	200 V
Current - Average Rectified (Io)	4 A
Voltage - Forward (Vf) (Max) @ If	890 mV @ 4 A
Reverse Recovery Time (trr)	35 ns
Current - Reverse Leakage @ Vr	5 µA @ 200 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)
Mounting Type	Surface Mount
Package / Case	DO-214AB, SMC
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the MURS320T3 is determined by the following critical parameters:

Electrical Compatibility Requirements:

Voltage - DC Reverse (Vr) (Max): 200 V minimum
Current - Average Rectified (Io): 3 A minimum (note: MURS320T3 rated at 4 A; substitutes rated at 3 A are acceptable for applications not requiring the full 4 A capacity)
Reverse Recovery Time (trr): 35 ns or faster
Current - Reverse Leakage @ Vr: 5 µA @ 200 V or lower
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)

Mechanical Compatibility Requirements:

Mounting Type: Surface Mount
Package / Case: DO-214AB, SMC

Compliance Considerations:

RoHS Status: ROHS3 Compliant preferred (MURS320T3 is RoHS non-compliant)
Moisture Sensitivity Level (MSL): 1 (Unlimited)

All substitute parts listed meet or exceed the electrical and mechanical requirements of the MURS320T3 within the specified parameters.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io (A)	Vf (Max) @ If	trr (ns)	Ir @ Vr	Package	Product Status	RoHS Status
MURS320T3	onsemi	200 V	4 A	890 mV @ 4 A	35 ns	5 µA @ 200 V	DO-214AB, SMC	Obsolete	RoHS non-compliant
MURS320T3G	onsemi	200 V	3 A	875 mV @ 3 A	35 ns	5 µA @ 200 V	DO-214AB, SMC	Active	ROHS3 Compliant
ES3D	Diotec Semiconductor	200 V	3 A	900 mV @ 3 A	20 ns	5 µA @ 200 V	DO-214AB, SMC	Active	ROHS3 Compliant
CSFC303-G	Comchip Technology	200 V	3 A	950 mV @ 3 A	35 ns	5 µA @ 200 V	DO-214AB, SMC	Active	ROHS3 Compliant
ER3D-TP	Micro Commercial Co	200 V	3 A	950 mV @ 3 A	35 ns	5 µA @ 200 V	DO-214AB, SMC	Active	ROHS3 Compliant
MURS320-13-F	Diodes Incorporated	200 V	3 A	875 mV @ 3 A	25 ns	5 µA @ 200 V	DO-214AB, SMC	Active	ROHS3 Compliant
MURS320-E3/57T	Vishay General Semiconductor - Diodes Division	200 V	3 A	875 mV @ 3 A	35 ns	5 µA @ 200 V	DO-214AB, SMC	Active	ROHS3 Compliant
MURS320-E3/9AT	Vishay General Semiconductor - Diodes Division	200 V	3 A	875 mV @ 3 A	35 ns	5 µA @ 200 V	DO-214AB, SMC	Active	ROHS3 Compliant
STTH302S	STMicroelectronics	200 V	3 A	950 mV @ 3 A	35 ns	3 µA @ 200 V	DO-214AB, SMC	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalent (Preferred): MURS320T3G is the direct successor from onsemi. This part maintains the same base product number (MURS320) and offers active product status with ROHS3 compliance. The primary difference is the rated current of 3 A versus the original 4 A specification. Selection of MURS320T3G is appropriate for applications where the 3 A rating satisfies circuit requirements.

Alternative Substitutes (Active Status, ROHS3 Compliant): All remaining substitute parts listed are active products with ROHS3 compliance. Selection among these alternatives depends on specific application requirements:

MURS320-13-F (Diodes Incorporated) and MURS320-E3/57T (Vishay) offer the lowest forward voltage drop at 875 mV @ 3 A and faster reverse recovery times (25 ns and 35 ns respectively).
ES3D (Diotec Semiconductor) provides the fastest reverse recovery time at 20 ns, beneficial for high-frequency switching applications.
STTH302S (STMicroelectronics) offers the lowest reverse leakage current at 3 µA @ 200 V.

All substitute parts are rated for 200 V DC reverse voltage, 3 A average rectified current, and feature the same DO-214AB SMC package. All are classified as active products with ROHS3 compliance, ensuring long-term availability and regulatory alignment.

Frequently Asked Questions (FAQ)

Q: Can MURS320T3G be used as a direct replacement for MURS320T3?

A: MURS320T3G is functionally compatible with MURS320T3 for most applications. Both parts share the same 200 V reverse voltage rating, DO-214AB SMC package, and fast recovery characteristics. The primary difference is the rated current: MURS320T3G is rated at 3 A versus MURS320T3 at 4 A. If your circuit operates at or below 3 A, MURS320T3G is a suitable replacement. MURS320T3G also offers the advantage of active product status and ROHS3 compliance.

Q: What is the significance of reverse recovery time (trr) in selecting a substitute?

A: Reverse recovery time determines how quickly the diode transitions from conducting to blocking state. The MURS320T3 specifies 35 ns. Substitute parts with equal or faster trr values (such as MURS320-13-F at 25 ns or ES3D at 20 ns) are compatible and may offer improved performance in switching applications. Slower trr values would not be acceptable substitutes.

Q: Are all listed substitutes available in the same package?

A: Yes. All substitute parts are packaged in DO-214AB, commonly referred to as SMC (Surface Mount Case). This ensures mechanical compatibility with existing PCB layouts and assembly processes. Packaging variants (Cut Tape, Digi-Reel, Tape & Reel) differ only in supply format and do not affect component functionality.

Q: Why is RoHS compliance important for selecting a substitute?

A: The MURS320T3 is RoHS non-compliant, reflecting its obsolete status. All listed substitute parts are ROHS3 compliant, meeting current regulatory requirements for electronic components in most markets. For new designs or production runs subject to RoHS regulations, ROHS3 compliant substitutes are mandatory.

Q: Can I use a substitute with a lower forward voltage drop?

A: Yes. Substitutes with lower forward voltage drops (such as MURS320-13-F at 875 mV @ 3 A compared to MURS320T3 at 890 mV @ 4 A) are compatible and may provide improved efficiency through reduced power dissipation. This is a beneficial characteristic and does not compromise circuit functionality.

Q: What is the impact of using a 3 A rated diode in place of a 4 A rated diode?

A: The 3 A rating represents the maximum average rectified current the diode can safely conduct. If your circuit operates at or below 3 A, there is no functional impact. If your circuit requires sustained currents above 3 A, a 3 A rated substitute would be unsuitable. Verify your circuit's actual current requirements before selecting a substitute.

Q: Are there any thermal considerations when selecting a substitute?

A: Operating temperature ranges are provided for reference. MURS320T3 does not specify an operating temperature range. Substitute parts specify ranges such as -65°C to 175°C (onsemi, Diodes Incorporated, Vishay) or -50°C to 150°C (Diotec). These ranges indicate the diode's safe operating environment. Select a substitute with an operating temperature range that encompasses your application's thermal requirements.

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