U3C-E3/9AT Equivalent & Substitute Parts

Part Overview

The U3C-E3/9AT is a general-purpose rectifier diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount diode operates at 150 V DC reverse voltage with 2 A average rectified current and features fast recovery characteristics with a 20 ns reverse recovery time. The device is housed in a DO-214AB (SMC) package and is classified as an active product with ROHS3 compliance and unlimited moisture sensitivity rating.

Substitute parts are identified when equivalent electrical performance can be achieved within the specified parameter ranges of the application circuit, accounting for differences in voltage ratings, current capacity, and recovery characteristics.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	150	V
Current - Average Rectified (Io)	2	A
Voltage - Forward (Vf) (Max) @ If	900 mV @ 3 A	mV @ A
Reverse Recovery Time (trr)	20	ns
Current - Reverse Leakage @ Vr	10	µA @ 150 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	-
Package / Case	DO-214AB, SMC	-
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	-
Moisture Sensitivity Level (MSL)	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitute parts for the U3C-E3/9AT are qualified based on the following substitution criteria:

Primary Substitution Parameters:

Package compatibility: DO-214AB (SMC) surface mount package
Voltage rating: Equal to or greater than 150 V DC reverse voltage
Current capacity: Equal to or greater than 2 A average rectified current
Speed classification: Fast recovery characteristics (≤ 500ns, > 200mA)
Compliance: ROHS3 compliant with MSL 1 rating
Temperature range: Operating junction temperature range of -55°C to 150°C or higher

Substitute Categories:

Direct Equivalent (ES3C): Maintains identical voltage rating (150 V) with increased current capacity (3 A), identical package, and equivalent fast recovery performance. Suitable for direct replacement in applications where higher current margin is acceptable.

Enhanced Performance (STTH3R02S): Provides elevated voltage rating (200 V) and increased current capacity (3 A) with equivalent fast recovery speed. Suitable for applications requiring higher voltage headroom or increased current handling.

Parameter Comparison

Parameter	U3C-E3/9AT (Main)	ES3C (Substitute)	STTH3R02S (Substitute)
Manufacturer	Vishay General Semiconductor	Taiwan Semiconductor Corporation	STMicroelectronics
Voltage - DC Reverse (Vr) (Max)	150 V	150 V	200 V
Current - Average Rectified (Io)	2 A	3 A	3 A
Voltage - Forward (Vf) (Max) @ If	900 mV @ 3 A	950 mV @ 3 A	1 V @ 3 A
Reverse Recovery Time (trr)	20 ns	35 ns	30 ns
Current - Reverse Leakage @ Vr	10 µA @ 150 V	10 µA @ 150 V	3 µA @ 200 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA
Package / Case	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC
Operating Temperature - Junction	-55 to 150°C	-55 to 150°C	Max 175°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

ES3C Selection Criteria: The ES3C is a direct equivalent substitute with identical voltage rating and package configuration. This part maintains the same operating temperature range and compliance certifications as the U3C-E3/9AT. The increased current capacity (3 A versus 2 A) provides additional design margin without introducing incompatibilities. Selection of ES3C is appropriate when maintaining exact voltage specifications is required and higher current capacity is beneficial.

STTH3R02S Selection Criteria: The STTH3R02S provides enhanced voltage rating (200 V) and current capacity (3 A) within the same package footprint. This part is suitable for applications where higher reverse voltage stress margins are required or where circuit redesign permits utilization of higher voltage ratings. The maximum operating temperature of 175°C exceeds the U3C-E3/9AT specification. All parts maintain ROHS3 compliance and MSL 1 rating. Selection of STTH3R02S is appropriate when voltage headroom enhancement is a design objective.

Compliance Verification: All substitute parts maintain ROHS3 compliance, REACH unaffected status, and MSL 1 (unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage protocols.

Frequently Asked Questions (FAQ)

Q: Can the ES3C directly replace the U3C-E3/9AT in all applications?

A: The ES3C maintains identical voltage rating (150 V) and package configuration (DO-214AB, SMC) as the U3C-E3/9AT. The increased current capacity (3 A versus 2 A) does not create incompatibility. Direct substitution is valid when the application circuit is designed for the U3C-E3/9AT specifications.

Q: What is the primary difference between ES3C and STTH3R02S substitutes?

A: The ES3C maintains the 150 V voltage rating of the original part with increased current capacity. The STTH3R02S provides elevated voltage rating (200 V) with equivalent current capacity (3 A). Selection depends on whether the application requires voltage rating enhancement or maintains the original 150 V specification.

Q: Are all substitute parts housed in the same package?

A: Yes. The U3C-E3/9AT, ES3C, and STTH3R02S are all housed in the DO-214AB (SMC) surface mount package, ensuring mechanical and footprint compatibility on printed circuit boards.

Q: Do the substitute parts meet the same compliance requirements?

A: All parts listed are ROHS3 compliant with MSL 1 (unlimited) moisture sensitivity rating and REACH unaffected status. Compliance certifications are equivalent across all parts.

Q: How do reverse recovery times compare among the parts?

A: The U3C-E3/9AT specifies 20 ns reverse recovery time. The ES3C specifies 35 ns, and the STTH3R02S specifies 30 ns. All parts maintain fast recovery classification (≤ 500ns, > 200mA). Selection based on recovery time depends on specific circuit switching frequency requirements.

Q: What is the forward voltage difference among the parts?

A: At 3 A forward current, the U3C-E3/9AT specifies 900 mV maximum, the ES3C specifies 950 mV maximum, and the STTH3R02S specifies 1 V maximum. These differences are within typical design margins for general-purpose rectifier applications.

Q: Can STTH3R02S be used in circuits designed for 150 V operation?

A: Yes. The STTH3R02S 200 V rating exceeds the 150 V requirement. Higher voltage-rated components operate within specification when applied to lower voltage circuits. Selection of STTH3R02S is appropriate when voltage margin enhancement is desired.

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