U3D-M3/57T Equivalent & Substitute Parts

Part Overview

The U3D-M3/57T is a general-purpose rectifier diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates at 200 V DC reverse voltage with a 2 A average rectified current rating in a DO-214AB (SMC) package. The device is classified as Active product status and is ROHS3 compliant with unlimited moisture sensitivity level (MSL 1).

Substitute parts are necessary when the primary part number becomes unavailable, when alternative packaging formats are required, or when higher current ratings or improved performance characteristics are needed for specific circuit applications while maintaining electrical compatibility.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	200	V
Current - Average Rectified (Io)	2	A
Voltage - Forward (Vf) (Max) @ If	900 mV @ 3 A	mV
Reverse Recovery Time (trr)	30	ns
Current - Reverse Leakage @ Vr	10	µA @ 200 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the U3D-M3/57T is determined by strict adherence to the following electrical and mechanical parameters:

Critical Parameters for Direct Substitution:

Voltage - DC Reverse (Vr) (Max): 200 V minimum
Current - Average Rectified (Io): 2 A minimum
Package / Case: DO-214AB (SMC) surface mount
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)
Mounting Type: Surface Mount

Acceptable Variation Parameters:

Reverse Recovery Time (trr): May be equal to or faster than 30 ns
Voltage - Forward (Vf) (Max): May be equal to or lower than 900 mV @ 3 A
Current - Reverse Leakage @ Vr: May be equal to or lower than 10 µA @ 200 V
Operating Temperature Range: May be equal to or wider than -55°C to 150°C

Substitute parts are grouped into two categories: Parametric Equivalents (identical electrical specifications with different packaging or tape formats) and Manufacturer Recommended alternatives (higher current ratings or improved performance characteristics that maintain full backward compatibility).

Parameter Comparison

Part Number	Manufacturer	Vr (Max) V	Io (A)	Vf (Max) mV @ 3A	trr (ns)	Ir @ Vr (µA)	Package	Product Status	Inventory (Pcs)
U3D-M3/57T	Vishay	200	2	900	30	10 @ 200V	DO-214AB (SMC)	Active	643
U3D-E3/57T	Vishay	200	2	900	20	10 @ 200V	DO-214AB (SMC)	Active	12300
U3D-E3/9AT	Vishay	200	2	900	20	10 @ 200V	DO-214AB (SMC)	Active	2903
U3D-M3/9AT	Vishay	200	2	900	30	10 @ 200V	DO-214AB (SMC)	Active	7535
CURC303-G	Comchip Technology	200	3	1000	50	5 @ 200V	DO-214AB (SMC)	Active	4164
ER3D-TP	Micro Commercial Co	200	3	950	35	5 @ 200V	DO-214AB (SMC)	Active	16840
ES3D	Diotec Semiconductor	200	3	900	20	5 @ 200V	DO-214AB (SMC)	Active	131200
ES3D-13-F	Diodes Incorporated	200	3	900	25	10 @ 200V	DO-214AB (SMC)	Active	45182
MURS320-13-F	Diodes Incorporated	200	3	875	25	5 @ 200V	DO-214AB (SMC)	Active	7630
RS3D-13-F	Diodes Incorporated	200	3	1300	150	5 @ 200V	DO-214AB (SMC)	Active	5250
S3D	Diodes Incorporated	200	3	1150	2000	10 @ 200V	DO-214AB (SMC)	Obsolete	1076

Engineering Selection Recommendations

Parametric Equivalent Parts (Direct Substitution):

The U3D-E3/57T, U3D-E3/9AT, and U3D-M3/9AT are parametric equivalents of the U3D-M3/57T. All three parts maintain the 200 V reverse voltage and 2 A average rectified current specifications. The U3D-E3 variants feature improved reverse recovery time (20 ns versus 30 ns), providing faster switching characteristics. These parts are manufactured by Vishay General Semiconductor - Diodes Division and carry identical ROHS3 compliance and MSL 1 ratings. The primary difference is packaging format: U3D-E3/57T and U3D-M3/9AT are available in higher inventory quantities (12,300 and 7,535 units respectively) compared to the primary part (643 units).

Manufacturer Recommended Alternatives (Higher Current Rating):

The CURC303-G, ER3D-TP, ES3D, ES3D-13-F, MURS320-13-F, and RS3D-13-F are manufacturer-recommended alternatives rated for 3 A average rectified current, providing 50% higher current capacity than the U3D-M3/57T while maintaining 200 V reverse voltage rating and DO-214AB (SMC) package compatibility. These parts are fully backward compatible for applications requiring the 2 A specification.

Among the 3 A alternatives, ES3D (Diotec Semiconductor) offers the highest inventory availability (131,200 units) with 20 ns reverse recovery time and 900 mV forward voltage matching the primary part specifications. MURS320-13-F (Diodes Incorporated) provides the lowest forward voltage (875 mV @ 3 A) and widest operating temperature range (-65°C to 175°C). RS3D-13-F exhibits significantly higher reverse recovery time (150 ns) and forward voltage (1.3 V @ 3 A), making it suitable only for applications where switching speed is not critical.

Parts to Avoid:

S3D (Diodes Incorporated) is classified as Obsolete product status and exhibits standard recovery characteristics (2 µs reverse recovery time) rather than fast recovery, making it unsuitable for modern switching applications. This part should not be selected for new designs.

All recommended substitute parts maintain ROHS3 compliance, MSL 1 rating, and REACH Unaffected status consistent with the primary part.

Frequently Asked Questions (FAQ)

Q: Can U3D-E3/57T be used as a direct replacement for U3D-M3/57T?

A: Yes. The U3D-E3/57T is a parametric equivalent with identical voltage (200 V) and current (2 A) ratings, same DO-214AB (SMC) package, and equivalent fast recovery speed classification. The U3D-E3/57T features faster reverse recovery time (20 ns versus 30 ns), which is an improvement. Both parts are ROHS3 compliant with MSL 1 rating.

Q: What is the difference between parametric equivalents and manufacturer-recommended alternatives?

A: Parametric equivalents (U3D-E3/57T, U3D-E3/9AT, U3D-M3/9AT) maintain identical electrical specifications to the primary part. Manufacturer-recommended alternatives (CURC303-G, ER3D-TP, ES3D, ES3D-13-F, MURS320-13-F, RS3D-13-F) have higher current ratings (3 A versus 2 A) but remain fully backward compatible for 2 A applications.

Q: Can I use a 3 A rated diode in a circuit designed for 2 A?

A: Yes. A 3 A rated diode can be used in a 2 A application. The higher current rating provides design margin and does not create compatibility issues. The diode will operate within its safe operating area at the lower current level.

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

A: This classification indicates the diode exhibits fast recovery characteristics with reverse recovery time not exceeding 500 nanoseconds when switching currents greater than 200 mA. This specification is critical for high-frequency switching applications.

Q: Why does ES3D have significantly higher inventory than the primary part?

A: ES3D (Diotec Semiconductor) is a widely used industry-standard 3 A rectifier diode with 131,200 units in stock. Higher inventory availability reflects broader market adoption and suitability for general-purpose applications. The U3D-M3/57T is a 2 A variant with more specialized application requirements.

Q: Is the DO-214AB package the same as SMC?

A: Yes. DO-214AB and SMC (Surface Mount Case) refer to the same physical package. Both designations describe a surface mount rectifier diode package with identical dimensions and pin configuration.

Q: What is the significance of reverse recovery time (trr) differences?

A: Reverse recovery time determines how quickly the diode transitions from conducting to blocking state. Faster recovery times (lower trr values) reduce switching losses and enable higher frequency operation. The U3D-M3/57T has 30 ns trr, while U3D-E3 variants have 20 ns. Both are classified as fast recovery and suitable for the same applications.

Q: Can RS3D-13-F be used as a substitute?

A: RS3D-13-F meets the voltage and current requirements but exhibits significantly higher reverse recovery time (150 ns versus 30 ns) and forward voltage (1.3 V versus 900 mV). This part is suitable only for low-frequency rectification applications where switching speed is not critical. It is not recommended for high-frequency switching circuits.

Q: Why is S3D listed as Obsolete?

A: S3D is classified as Obsolete product status and exhibits standard recovery characteristics (2 µs reverse recovery time) rather than fast recovery. This part should not be selected for new designs. Active alternatives with superior performance characteristics are available.

Q: What compliance certifications should I verify?

A: All recommended substitute parts maintain ROHS3 compliance and REACH Unaffected status consistent with the primary U3D-M3/57T. Moisture Sensitivity Level (MSL) is 1 (Unlimited) for all Vishay and most alternative parts, indicating no special moisture handling requirements during storage or assembly.

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