UB8CT-E3/8W Equivalent & Substitute Parts

Part Overview

The UB8CT-E3/8W is a general-purpose rectifier diode manufactured by Vishay General Semiconductor - Diodes Division. This device is rated for 150 V DC reverse voltage with an 8 A average rectified current and features fast recovery characteristics with a 20 ns reverse recovery time. The component is housed in a Surface Mount TO-263AB (D2PAK) package.

The UB8CT-E3/8W is classified as obsolete. Locating equivalent or substitute components is necessary to support ongoing production requirements, maintenance operations, and design continuity where this part number is specified.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	150	V
Current - Average Rectified (Io)	8	A
Voltage - Forward (Vf) (Max) @ If	1.02 V @ 8 A	V
Reverse Recovery Time (trr)	20	ns
Current - Reverse Leakage @ Vr	10	µA @ 150 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Mounting Type	Surface Mount	—
Package / Case	TO-263-3, D2PAK (2 Leads + Tab), TO-263AB	—
Operating Temperature - Junction	-55°C ~ 150°C	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the UB8CT-E3/8W are selected based on the following criteria:

Primary Substitution Parameters:

Voltage - DC Reverse (Vr) (Max): Equal to or greater than 150 V
Current - Average Rectified (Io): Equal to or greater than 8 A
Mounting Type: Surface Mount
Package / Case: TO-263AB (D2PAK) compatible
Speed Classification: Fast Recovery characteristics
RoHS Status: ROHS3 Compliant

Substitution Logic:

The VS-MURB820-M3 qualifies as a direct substitute with enhanced specifications. It maintains the same 8 A current rating and TO-263AB package footprint while providing increased voltage capability (200 V vs. 150 V). The forward voltage is lower (975 mV vs. 1.02 V at rated current), and it retains fast recovery speed characteristics. This part is in active production status with higher inventory availability.

The STPS10150CG-TR is a Schottky diode array configuration that matches the 150 V voltage rating and TO-263AB package. However, it is rated for 5 A per diode (lower than the 8 A requirement) and features a different diode configuration (1 Pair Common Cathode). This part is suitable only for applications where the reduced current rating is acceptable and the diode array configuration is compatible with the circuit design.

Parameter Comparison

Parameter	UB8CT-E3/8W	VS-MURB820-M3	STPS10150CG-TR
Manufacturer	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division	STMicroelectronics
Voltage - DC Reverse (Vr) (Max)	150 V	200 V	150 V
Current - Average Rectified (Io)	8 A	8 A	5 A (per Diode)
Voltage - Forward (Vf) (Max) @ If	1.02 V @ 8 A	975 mV @ 8 A	920 mV @ 5 A
Reverse Recovery Time (trr)	20 ns	35 ns	Not specified
Current - Reverse Leakage @ Vr	10 µA @ 150 V	5 µA @ 200 V	2 µA @ 150 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Diode Configuration	Single Diode	Single Diode	1 Pair Common Cathode
Technology	Standard	Standard	Schottky
Mounting Type	Surface Mount	Surface Mount	Surface Mount
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
Operating Temperature - Junction	-55°C ~ 150°C	-65°C ~ 175°C	175°C (Max)
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

VS-MURB820-M3 (Primary Substitute)

The VS-MURB820-M3 is the recommended substitute for direct replacement of the UB8CT-E3/8W. Both components are manufactured by Vishay General Semiconductor - Diodes Division and share identical current ratings (8 A) and package specifications (TO-263AB). The VS-MURB820-M3 is in active production status with significantly higher inventory availability (5357 pcs vs. 1050 pcs). The increased voltage rating (200 V vs. 150 V) provides additional design margin without compromising performance. Both parts maintain ROHS3 compliance and MSL 1 classification. The VS-MURB820-M3 features improved reverse leakage characteristics (5 µA vs. 10 µA) and lower forward voltage drop (975 mV vs. 1.02 V), resulting in reduced power dissipation.

STPS10150CG-TR (Limited Substitution)

The STPS10150CG-TR is suitable only for applications where the reduced current rating (5 A per diode vs. 8 A) is acceptable. This part is manufactured by STMicroelectronics and features Schottky technology rather than standard rectifier technology. The diode array configuration (1 Pair Common Cathode) differs from the single-diode configuration of the UB8CT-E3/8W and requires circuit design compatibility verification. The STPS10150CG-TR is in active production status with high inventory availability (9540 pcs). This part is suitable for applications requiring lower current levels or where the Schottky characteristics and common cathode configuration provide circuit advantages.

Frequently Asked Questions (FAQ)

Q: Can the VS-MURB820-M3 be used as a direct replacement for the UB8CT-E3/8W?

A: Yes. The VS-MURB820-M3 is a direct replacement. Both components have identical current ratings (8 A), identical package specifications (TO-263AB), and identical mounting type (Surface Mount). The VS-MURB820-M3 provides higher voltage capability (200 V vs. 150 V), lower forward voltage drop, and improved reverse leakage characteristics. Both parts are ROHS3 compliant with MSL 1 classification.

Q: What is the difference between the UB8CT-E3/8W and the STPS10150CG-TR?

A: The STPS10150CG-TR differs in three key aspects: (1) Current rating is 5 A per diode versus 8 A for the UB8CT-E3/8W, (2) Diode configuration is 1 Pair Common Cathode versus single diode, and (3) Technology is Schottky versus standard rectifier. The STPS10150CG-TR is suitable only for applications where the reduced current rating and diode array configuration are compatible with the circuit design.

Q: Are all three parts compatible with the same PCB footprint?

A: Yes. All three parts use the TO-263AB (D2PAK) package with identical pin configurations and footprints. PCB layout modifications are not required for substitution between these parts.

Q: What is the significance of the voltage rating difference between the UB8CT-E3/8W (150 V) and the VS-MURB820-M3 (200 V)?

A: The higher voltage rating of the VS-MURB820-M3 provides additional design margin and allows operation in higher voltage applications. A component rated for 200 V can be used in circuits designed for 150 V operation without performance degradation. The increased voltage rating does not negatively impact performance in lower voltage applications.

Q: Why is the UB8CT-E3/8W classified as obsolete?

A: The UB8CT-E3/8W is no longer in active production. The VS-MURB820-M3 is the active production equivalent from the same manufacturer with enhanced specifications and superior availability.

Q: What are the compliance and regulatory considerations for these parts?

A: All three parts are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with HTSUS code 8541.10.0080. All parts have MSL 1 (Unlimited) moisture sensitivity classification, indicating no special moisture handling requirements during storage or assembly.

Q: How do the reverse recovery time specifications compare?

A: The UB8CT-E3/8W has a reverse recovery time of 20 ns, while the VS-MURB820-M3 has 35 ns. Both parts meet the fast recovery classification (≤ 500ns for > 200mA). The difference of 15 ns is negligible for most applications and does not affect functional compatibility.

Q: What is the operating temperature range difference between these parts?

A: The UB8CT-E3/8W operates from -55°C to 150°C, while the VS-MURB820-M3 operates from -65°C to 175°C. The VS-MURB820-M3 provides a wider operating temperature range, offering additional design flexibility for extreme temperature applications.

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