RS3MC-HF Equivalent & Substitute Parts

Part Overview

The RS3MC-HF is a general-purpose rectifier diode manufactured by Comchip Technology, rated for 1000 V DC reverse voltage and 3 A average rectified current in a surface mount DO-214AB (SMC) package. This component is classified as Active product status and is RoHS3 compliant with unlimited moisture sensitivity level (MSL 1).

Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained across the critical parameters that define rectifier diode functionality: reverse voltage rating, average rectified current, forward voltage drop, recovery characteristics, and package form factor.

Substiute Parts

RS3MC-HF

Comchip TechnologyIn Stock: 915RS3MC-HF Datasheet

Current PartRFQ

RS3MC

MDDIn Stock: 3843RS3MC Datasheet

Parametric EquivalentRFQ

RS3MH

Taiwan Semiconductor CorporationIn Stock: 3824RS3MH Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RS3MC-HF are qualified based on strict equivalence in the following electrical and mechanical parameters:

• Reverse Voltage Rating: 1000 V (exact match required)
• Average Rectified Current: 3 A (exact match required)
• Forward Voltage Drop: 1.3 V @ 3 A (exact match required)
• Recovery Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io) (exact match required)
• Reverse Recovery Time: 500 ns (exact match required)
• Package Form Factor: DO-214AB / SMC surface mount (exact match required)
• Operating Temperature Range: -55°C to 150°C (exact match required)

The identified substitute parts RS3MC (MDD) and RS3MH (Taiwan Semiconductor Corporation) meet all critical electrical specifications and package requirements. Variations in secondary parameters such as reverse leakage current, capacitance, and manufacturer certifications do not disqualify substitution when primary performance criteria are satisfied.

Parameter Comparison

Engineering Selection Recommendations

RS3MC (MDD): This substitute maintains full electrical equivalence to the RS3MC-HF across all primary performance parameters. The part is Active product status with RoHS compliance. Capacitance is slightly elevated at 60 pF versus 40 pF, which may introduce minor differences in high-frequency switching applications but does not affect core rectification performance. This part is suitable for general-purpose rectification applications where the primary electrical specifications are the controlling factors.

RS3MH (Taiwan Semiconductor Corporation): This substitute meets all critical electrical specifications and is qualified to AEC-Q101 automotive standard with ROHS3 compliance. Reverse leakage current is specified at 10 µA versus 5 µA for the main part, representing a 2× increase in leakage. Capacitance is not specified. The automotive qualification and AEC-Q101 certification indicate suitability for applications requiring automotive-grade reliability. This part is appropriate for applications where automotive qualification is required or beneficial, provided the higher reverse leakage current is acceptable within circuit design margins.

Selection between substitute parts depends on application requirements: standard industrial applications may use either RS3MC or RS3MH; automotive applications requiring AEC-Q101 qualification should specify RS3MH; applications sensitive to reverse leakage current should prioritize RS3MC-HF or RS3MC.

Frequently Asked Questions (FAQ)

Q: Can RS3MC (MDD) be used as a direct replacement for RS3MC-HF in all applications?

A: Yes, RS3MC meets all critical electrical specifications: 1000 V reverse voltage, 3 A average rectified current, 1.3 V forward voltage drop, 500 ns recovery time, and identical package form factor (DO-214AB SMC). The capacitance difference (60 pF vs. 40 pF) does not affect rectification performance in standard applications.

Q: What is the significance of the AEC-Q101 qualification on RS3MH?

A: AEC-Q101 is an automotive industry standard qualification that certifies component reliability under automotive operating conditions. RS3MH carries this qualification, making it suitable for automotive applications. The main part RS3MC-HF does not list this qualification.

Q: Why does RS3MH specify higher reverse leakage current (10 µA vs. 5 µA)?

A: Reverse leakage current variation is a normal manufacturing parameter within the same voltage and current class. The 10 µA specification for RS3MH remains within acceptable limits for general-purpose rectification. Circuit designers should verify that this leakage level is acceptable within their specific application's power budget and bias conditions.

Q: Are all three parts (RS3MC-HF, RS3MC, RS3MH) identical in physical dimensions?

A: Yes, all three parts use the DO-214AB (SMC) surface mount package, ensuring identical physical dimensions, footprint, and mounting compatibility on PCBs.

Q: What does MSL 1 (Unlimited) mean for moisture sensitivity?

A: MSL 1 indicates the lowest moisture sensitivity level, meaning the component can be stored indefinitely without special moisture control measures. All three parts carry MSL 1 rating.

Q: Can RS3MH be used in non-automotive applications?

A: Yes, RS3MH can be used in any application where the electrical specifications match requirements. The AEC-Q101 qualification is an additional certification that does not restrict use to automotive applications only.

Q: What is the difference between ROHS3 and RoHS compliance?

A: ROHS3 is the current version of the Restriction of Hazardous Substances directive. Both RS3MC-HF and RS3MH carry ROHS3 compliance. RS3MC (MDD) carries RoHS compliance, which may refer to an earlier version. Both indicate hazardous substance restrictions are met.