Equivalent & Substitute Parts for RS3KC-HF

Part Overview

The RS3KC-HF is a general-purpose rectifier diode manufactured by Comchip Technology, rated for 800 V DC reverse voltage and 3 A average rectified current in a DO-214AB surface mount package. This diode is classified as a fast recovery device with a reverse recovery time of 500 ns and is suitable for standard industrial applications requiring efficient power conversion at moderate voltage levels. The part is currently active in production with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Equivalent and substitute parts are identified to support design flexibility, supply chain continuity, and application-specific requirements such as automotive qualification or alternative packaging formats.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	800	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max)	1.3	V @ 3 A
Reverse Recovery Time (trr)	500	ns
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 RS3KC-HF is determined by strict equivalence across the following critical parameters:

Mandatory Equivalence Criteria:

Voltage - DC Reverse (Vr) (Max): 800 V
Current - Average Rectified (Io): 3 A
Package / Case: DO-214AB, SMC
Mounting Type: Surface Mount
Reverse Recovery Time (trr): 500 ns
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)
Operating Temperature Range: -55°C to 150°C
RoHS Status: ROHS3 Compliant

Acceptable Parameter Variations:

Voltage - Forward (Vf) (Max): Rated at 1.3 V with measurement current variations (2.5 A or 3 A)
Current - Reverse Leakage @ Vr: Range 5 µA to 10 µA at 800 V
Capacitance @ Vr, F: Range 34 pF to 40 pF at 4 V, 1 MHz
Packaging Format: Tape & Reel (TR), Cut Tape (CT) & Digi-Reel®
Grade and Qualification: Standard or Automotive (AEC-Q101)

All four substitute parts meet the mandatory equivalence criteria and are classified as parametric equivalents to the RS3KC-HF.

Parameter Comparison

Parameter	RS3KC-HF (Comchip)	RS3K-E3/57T (Vishay)	RS3K-E3/9AT (Vishay)	RS3KH (Taiwan Semi)	RS3KHE3_A/H (Vishay)
Voltage - DC Reverse (Vr) (Max)	800 V	800 V	800 V	800 V	800 V
Current - Average Rectified (Io)	3 A	3 A	3 A	3 A	3 A
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 3 A	1.3 V @ 2.5 A	1.3 V @ 2.5 A	1.3 V @ 3 A	1.3 V @ 2.5 A
Reverse Recovery Time (trr)	500 ns	500 ns	500 ns	500 ns	500 ns
Current - Reverse Leakage @ Vr	5 µA @ 800 V	10 µA @ 800 V	10 µA @ 800 V	10 µA @ 800 V	10 µA @ 800 V
Capacitance @ Vr, F	40 pF @ 4V, 1MHz	34 pF @ 4V, 1MHz	34 pF @ 4V, 1MHz	Not specified	34 pF @ 4V, 1MHz
Package / Case	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature - Junction	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Grade / Qualification	Standard	Standard	Standard	Automotive / AEC-Q101	Automotive / AEC-Q101
Packaging Format	Tape & Reel (TR)	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)	Tape & Reel (TR)
Inventory Status	814 Pcs	10200 Pcs	10859 Pcs	4037 Pcs	95200 Pcs

Engineering Selection Recommendations

RS3K-E3/57T (Vishay General Semiconductor - Diodes Division)

This part is a direct parametric equivalent with identical voltage, current, and package specifications. It maintains the same fast recovery characteristics and operating temperature range. The part is active in production with ROHS3 compliance and unlimited MSL rating. Inventory availability is substantial at 10,200 units. This substitute is suitable for standard industrial applications where automotive qualification is not required.

RS3K-E3/9AT (Vishay General Semiconductor - Diodes Division)

This part is electrically equivalent to RS3K-E3/57T with identical electrical parameters. The primary distinction is packaging format: supplied in Cut Tape (CT) and Digi-Reel® format rather than standard Tape & Reel. This option is appropriate for applications requiring alternative tape formats or lower-volume procurement. Inventory availability is 10,859 units. Product status is active with full ROHS3 compliance.

RS3KH (Taiwan Semiconductor Corporation)

This part meets all mandatory equivalence criteria with identical voltage, current, and package specifications. Forward voltage is rated at 1.3 V @ 3 A, matching the original part specification. The RS3KH carries automotive grade qualification (AEC-Q101), making it suitable for automotive and mission-critical applications requiring enhanced reliability standards. Inventory is available at 4,037 units. This substitute is appropriate when automotive-grade components are specified or preferred.

RS3KHE3_A/H (Vishay General Semiconductor - Diodes Division)

This part is a parametric equivalent with automotive grade qualification (AEC-Q101) and the highest inventory availability at 95,200 units. It maintains all mandatory electrical specifications including 800 V reverse voltage, 3 A current rating, and 500 ns reverse recovery time. The automotive qualification makes this part suitable for applications requiring enhanced reliability and traceability. This substitute provides the best supply chain continuity and is appropriate for both standard and automotive applications.

Frequently Asked Questions (FAQ)

Q: Can RS3KC-HF be directly replaced with any of these substitute parts?

A: Yes. All four substitute parts are parametric equivalents meeting the mandatory electrical and mechanical specifications: 800 V reverse voltage, 3 A average rectified current, DO-214AB package, surface mount configuration, 500 ns reverse recovery time, and -55°C to 150°C operating temperature range. Direct substitution is supported without circuit modification.

Q: What is the difference between standard and automotive-grade versions?

A: The RS3KH and RS3KHE3_A/H carry automotive grade qualification (AEC-Q101), indicating compliance with automotive reliability and testing standards. Standard versions (RS3K-E3/57T and RS3K-E3/9AT) are suitable for industrial applications. Automotive-grade parts are required for automotive and mission-critical applications where enhanced reliability documentation is specified.

Q: Are there differences in forward voltage specifications?

A: The RS3KC-HF and RS3KH are rated at 1.3 V @ 3 A. The Vishay parts (RS3K-E3/57T, RS3K-E3/9AT, and RS3KHE3_A/H) are rated at 1.3 V @ 2.5 A. Both specifications are within the same maximum forward voltage limit of 1.3 V and are functionally equivalent for circuit design purposes.

Q: What is the difference between Tape & Reel and Cut Tape packaging?

A: Tape & Reel (TR) is the standard format for high-volume automated assembly. Cut Tape (CT) and Digi-Reel® are alternative formats suitable for lower-volume applications or specific assembly equipment requirements. The RS3K-E3/9AT is available in Cut Tape format, while other substitutes use standard Tape & Reel. Electrical performance is identical across all packaging formats.

Q: Which substitute offers the best supply chain availability?

A: The RS3KHE3_A/H offers the highest inventory at 95,200 units, providing superior supply chain continuity. This part combines automotive-grade qualification with extensive stock availability, making it the optimal choice for applications requiring both reliability certification and supply security.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All substitute parts carry ROHS3 compliance certification. The RS3KC-HF is also ROHS3 compliant. All parts maintain unlimited moisture sensitivity rating (MSL 1), indicating no special storage or handling requirements.

Q: Can these parts be used interchangeably in automotive applications?

A: The RS3KH and RS3KHE3_A/H carry AEC-Q101 automotive qualification and are specified for automotive applications. The standard-grade parts (RS3K-E3/57T and RS3K-E3/9AT) may be used in automotive applications only if automotive qualification is not explicitly required by design specifications. Verify application requirements before substitution.

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