UH3C-E3/9AT Equivalent & Substitute Parts

Part Overview

The UH3C-E3/9AT is a general-purpose rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 150 V DC reverse voltage and 3 A average rectified current in a DO-214AB (SMC) surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The diode features fast recovery characteristics with a reverse recovery time of 40 ns and operates across a junction temperature range of -55°C to 175°C.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	150	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1.05	V @ 3 A
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	-
Reverse Recovery Time (trr)	40	ns
Current - Reverse Leakage @ Vr	5	µA @ 150 V
Package / Case	DO-214AB, SMC	-
Mounting Type	Surface Mount	-
Operating Temperature - Junction	-55 to 175	°C
RoHS Status	ROHS3 Compliant	-
Moisture Sensitivity Level (MSL)	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitution of the UH3C-E3/9AT is determined by the following critical parameters:

Voltage Rating: The DC reverse voltage (Vr) must be equal to or greater than 150 V. Parts rated at higher voltages (200 V) are acceptable as they provide additional safety margin.

Current Rating: The average rectified current (Io) must be equal to or greater than 3 A to maintain design performance.

Package Compatibility: The DO-214AB (SMC) surface mount package is the primary requirement for direct mechanical and electrical compatibility. Equivalent packages (SMB, SMC variants) may be acceptable depending on PCB layout constraints.

Technology Type: Both standard rectifier diodes and Schottky diodes are included as substitutes. Standard diodes maintain identical forward voltage characteristics, while Schottky diodes offer lower forward voltage (approximately 820 mV vs. 1.05 V) at the cost of higher reverse leakage current.

Recovery Speed: Fast recovery characteristics (≤ 500ns) are maintained across all substitute options to preserve switching performance.

Compliance: All substitute parts maintain ROHS3 compliance and MSL 1 rating, ensuring environmental and moisture handling compatibility.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ 3A [V]	Technology	trr [ns]	Package	Status
UH3C-E3/9AT	Vishay	150	3	1.05	Standard	40	DO-214AB (SMC)	Obsolete
UH3CHE3_A/H	Vishay	150	3	1.05	Standard	40	DO-214AB (SMC)	Active
UH3CHE3_A/I	Vishay	150	3	1.05	Standard	40	DO-214AB (SMC)	Active
VS-3ECH02-M3/9AT	Vishay	200	3	0.90	Standard	-	DO-214AB (SMC)	Active
ES3C	Taiwan Semiconductor Corporation	150	3	0.95	Standard	35	DO-214AB (SMC)	Active
ES3C-13-F	Diodes Incorporated	150	3	0.90	Standard	25	DO-214AB (SMC)	Active
ES3D	Diotec Semiconductor	200	3	0.90	Standard	20	DO-214AB (SMC)	Active
STPS3150U	STMicroelectronics	150	3	0.82	Schottky	-	DO-214AA (SMB)	Active

Engineering Selection Recommendations

Parametric Equivalents (Direct Replacement):

The parts UH3CHE3_A/H and UH3CHE3_A/I are parametric equivalents manufactured by Vishay with identical electrical specifications to the UH3C-E3/9AT. Both are active products with AEC-Q101 automotive qualification. These parts provide the most direct substitution path with no design changes required. UH3CHE3_A/H and UH3CHE3_A/I differ only in packaging configuration (Tape & Reel) and are suitable for high-volume production environments.

Voltage-Rated Upgrades (Higher Voltage Rating):

The VS-3ECH02-M3/9AT (Vishay, 200 V) and ES3D (Diotec, 200 V) provide higher voltage ratings while maintaining 3 A current capacity and DO-214AB package compatibility. These parts are suitable for applications where additional voltage margin is beneficial. The ES3D offers superior reverse recovery time (20 ns) compared to the original specification (40 ns), resulting in improved switching performance.

Same Voltage Rating Alternatives:

The ES3C (Taiwan Semiconductor Corporation, 150 V) and ES3C-13-F (Diodes Incorporated, 150 V) maintain the original 150 V voltage rating with 3 A current capacity. Both are active products with fast recovery characteristics. ES3C-13-F provides faster reverse recovery time (25 ns) than the original part, improving efficiency in high-frequency switching applications.

Schottky Technology Alternative:

The STPS3150U (STMicroelectronics) is a Schottky diode with 150 V rating and 3 A capacity. It features significantly lower forward voltage (820 mV vs. 1.05 V), reducing power dissipation in high-current applications. The package is DO-214AA (SMB), which is mechanically similar to DO-214AB but requires verification of PCB footprint compatibility. This option is suitable for applications prioritizing thermal performance over switching speed.

Product Status Consideration:

All recommended substitute parts maintain active product status, ensuring long-term availability and supply chain stability. The original UH3C-E3/9AT is obsolete; therefore, migration to an active equivalent is necessary for new designs and ongoing production support.

Frequently Asked Questions (FAQ)

Q: Can UH3CHE3_A/H and UH3CHE3_A/I be used as direct replacements for UH3C-E3/9AT?

A: Yes. Both parts are manufactured by Vishay with identical electrical parameters (150 V, 3 A, 1.05 V forward voltage, 40 ns recovery time) and the same DO-214AB package. The primary difference is packaging format (Tape & Reel vs. bulk). Both are active products, making them suitable for immediate substitution without circuit redesign.

Q: What is the difference between standard rectifier diodes and Schottky diodes in this comparison?

A: Standard rectifier diodes (UH3C-E3/9AT, UH3CHE3_A/H, UH3CHE3_A/I, VS-3ECH02-M3/9AT, ES3C, ES3C-13-F, ES3D) use a p-n junction and exhibit forward voltages between 0.90 V and 1.05 V at 3 A. The Schottky diode (STPS3150U) uses a metal-semiconductor junction with lower forward voltage (0.82 V), reducing power dissipation but increasing reverse leakage current. Schottky diodes are preferred in high-current, low-voltage applications where thermal management is critical.

Q: Are higher voltage-rated parts (200 V) compatible with a 150 V design?

A: Yes. Higher voltage ratings provide additional safety margin and are electrically compatible with 150 V designs. Parts such as VS-3ECH02-M3/9AT (200 V) and ES3D (200 V) can be substituted without circuit modification. The higher voltage rating does not negatively impact performance in 150 V applications.

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

A: Reverse recovery time is the interval required for a diode to transition from forward conduction to reverse blocking after the applied voltage reverses. Shorter recovery times (20-25 ns in ES3C-13-F and ES3D) reduce switching losses and improve efficiency in high-frequency applications. The original UH3C-E3/9AT specifies 40 ns; faster alternatives reduce power dissipation but are not required for direct compatibility.

Q: Is the STPS3150U package (SMB) compatible with DO-214AB (SMC) PCB layouts?

A: The SMB (DO-214AA) and SMC (DO-214AB) packages are physically similar but have different footprints. PCB layout verification is required before substitution. If the PCB is designed specifically for DO-214AB, the STPS3150U requires footprint modification. Confirm PCB design specifications before selecting this alternative.

Q: Do all substitute parts maintain RoHS3 compliance?

A: Yes. All substitute parts listed (UH3CHE3_A/H, UH3CHE3_A/I, VS-3ECH02-M3/9AT, ES3C, ES3C-13-F, ES3D, STPS3150U) are ROHS3 compliant and maintain MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage processes.

Q: Which substitute part offers the best overall performance improvement?

A: The ES3D (Diotec, 200 V, 3 A) provides multiple performance advantages: higher voltage rating (200 V vs. 150 V), lower forward voltage (0.90 V vs. 1.05 V), and fastest reverse recovery time (20 ns vs. 40 ns). These characteristics result in reduced power dissipation and improved switching efficiency while maintaining DO-214AB package compatibility and active product status.

Q: Are automotive-qualified parts (UH3CHE3_A/H, UH3CHE3_A/I) required for all applications?

A: Automotive qualification (AEC-Q101) is required only for automotive and safety-critical applications. For general industrial and consumer applications, non-qualified alternatives (ES3C, ES3C-13-F, ES3D) are acceptable. Verify application requirements before selecting a qualified or non-qualified part.

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