Equivalent & Substitute Parts for 15ETH03S

Part Overview

The 15ETH03S is a general-purpose rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 300 V DC reverse voltage and 15 A average rectified current in a surface mount TO-263AB (D2PAK) package. This part is classified as obsolete, necessitating identification of equivalent and substitute components for ongoing design requirements and procurement needs. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts may differ in specific parameters while remaining functionally compatible within defined application constraints.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	300	V
Current - Average Rectified (Io)	15	A
Voltage - Forward (Vf) (Max) @ If	1.25 @ 15 A	V
Reverse Recovery Time (trr)	40	ns
Current - Reverse Leakage @ Vr	40 µA @ 300 V	µA
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Package / Case	TO-263-3, D2PAK (2 Leads + Tab), TO-263AB	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-65 to 175	°C

Substitute Part Grouping Explanation

Substitution of the 15ETH03S is determined by the following critical parameters: voltage rating (Vr), current rating (Io), forward voltage drop (Vf), reverse recovery time (trr), package type, and mounting configuration. Parts are classified into two categories:

Parametric Equivalent (Identical Specifications): Parts maintaining all electrical specifications and package configuration as the 15ETH03S, differing only in product status, compliance certifications, or packaging format.

Manufacturer Recommended Substitute (Functional Substitute): Parts with different electrical ratings that may be applied in circuits where the original specifications exceed application requirements, provided the substitute ratings remain adequate for the intended function.

The 15ETH03S operates at 300 V / 15 A with a 40 ns reverse recovery time. Equivalent parts must maintain these exact specifications. Substitute parts may operate at higher voltage or lower current ratings if circuit design permits such derating.

Parameter Comparison

Parameter	15ETH03S (Main)	VS-15ETH03S-M3 (Equivalent)	LXA03B600 (Substitute)
Manufacturer	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division	Power Integrations
Voltage - DC Reverse (Vr) (Max)	300 V	300 V	600 V
Current - Average Rectified (Io)	15 A	15 A	3 A
Voltage - Forward (Vf) (Max) @ If	1.25 V @ 15 A	1.25 V @ 15 A	3.1 V @ 3 A
Reverse Recovery Time (trr)	40 ns	40 ns	20 ns
Current - Reverse Leakage @ Vr	40 µA @ 300 V	40 µA @ 300 V	250 µA @ 600 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Package / Case	TO-263-3, D2PAK (2 Leads + Tab), TO-263AB	TO-263-3, D2PAK (2 Leads + Tab), TO-263AB	TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Operating Temperature - Junction	-65 to 175 °C	-65 to 175 °C	150 °C (Max)
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	RoHS Compliant

Engineering Selection Recommendations

VS-15ETH03S-M3 (Parametric Equivalent): This part is the direct parametric equivalent to the 15ETH03S, maintaining identical electrical specifications (300 V, 15 A, 40 ns trr) and package configuration. The VS-15ETH03S-M3 is classified as active product status with ROHS3 compliance, addressing the obsolescence of the original part. This substitute is suitable for direct replacement in existing designs without circuit modification. Packaging is supplied in tube format.

LXA03B600 (Manufacturer Recommended Substitute): This part is a functional substitute with different electrical ratings: 600 V reverse voltage and 3 A average rectified current. The LXA03B600 is manufactured by Power Integrations under the Qspeed™ series and is classified as active product status with RoHS compliance. This substitute is applicable only in circuits where the 15 A current requirement can be satisfied by a 3 A rated device through circuit design or load reduction, and where the higher 600 V rating does not create design conflicts. The LXA03B600 exhibits superior reverse recovery time (20 ns) compared to the original specification (40 ns). Operating temperature maximum is 150 °C, which is lower than the 15ETH03S specification of 175 °C. Packaging is supplied in cut tape and Digi-Reel® format.

Frequently Asked Questions (FAQ)

Q: Can VS-15ETH03S-M3 be used as a direct replacement for 15ETH03S?

A: Yes. The VS-15ETH03S-M3 maintains identical electrical specifications (300 V, 15 A, 1.25 V forward voltage, 40 ns reverse recovery time) and package configuration (TO-263AB D2PAK). Both parts are surface mount devices with the same thermal and electrical characteristics. The primary difference is product status (active versus obsolete) and RoHS compliance (ROHS3 versus non-compliant).

Q: Under what conditions can LXA03B600 substitute for 15ETH03S?

A: The LXA03B600 can substitute for 15ETH03S only when circuit design permits operation at reduced current capacity (3 A maximum versus 15 A). The higher voltage rating (600 V) is not a limitation for 300 V applications. However, the lower maximum operating temperature (150 °C versus 175 °C) must be evaluated against thermal design requirements. The improved reverse recovery time (20 ns) is advantageous for switching performance.

Q: Are all three parts in the same package?

A: Yes. The 15ETH03S, VS-15ETH03S-M3, and LXA03B600 are all housed in the TO-263-3 D2PAK (2 Leads + Tab) surface mount package designated TO-263AB. Pin configuration and PCB footprint are identical across all three parts.

Q: What is the difference between the packaging formats?

A: The 15ETH03S and VS-15ETH03S-M3 are supplied by Vishay. The 15ETH03S packaging format is not specified in available data. The VS-15ETH03S-M3 is supplied in tube packaging. The LXA03B600 is supplied in cut tape (CT) and Digi-Reel® format by Power Integrations. These packaging differences affect procurement and handling but do not impact electrical performance or PCB assembly compatibility.

Q: What is the significance of the RoHS compliance difference?

A: The 15ETH03S is RoHS non-compliant, while VS-15ETH03S-M3 is ROHS3 compliant and LXA03B600 is RoHS compliant. RoHS compliance indicates restriction of hazardous substances in accordance with applicable regulations. For applications subject to RoHS requirements, the VS-15ETH03S-M3 or LXA03B600 must be selected. Both substitute parts satisfy RoHS compliance requirements.

Q: How do reverse recovery times compare across the three parts?

A: The 15ETH03S and VS-15ETH03S-M3 both specify 40 ns reverse recovery time. The LXA03B600 specifies 20 ns reverse recovery time, which is superior. Faster reverse recovery reduces switching losses and improves efficiency in high-frequency switching applications. This characteristic makes the LXA03B600 advantageous for performance-critical designs, provided current and temperature ratings are adequate.

Q: What inventory availability exists for these parts?

A: The 15ETH03S has 958 pieces in stock (obsolete status). The VS-15ETH03S-M3 has 752 pieces in stock (active status). The LXA03B600 has 6201 pieces in stock (active status). For long-term procurement planning, the active status parts (VS-15ETH03S-M3 and LXA03B600) provide greater supply security.

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