CURC301-G Equivalent & Substitute Parts Reference

Part Overview

The CURC301-G is a general-purpose rectifier diode manufactured by Comchip Technology, rated for 50 V DC reverse voltage and 3 A average rectified current in a DO-214AB (SMC) surface mount package. This diode is classified as Active product status and is RoHS3 compliant with unlimited moisture sensitivity level (MSL 1).

Substitute parts become necessary when the primary part experiences supply constraints, extended lead times, or when design flexibility permits selection from multiple qualified manufacturers. The substitute parts listed maintain electrical and mechanical compatibility within the specified parameter ranges for this product category.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1 V @ 3 A	V @ A
Reverse Recovery Time (trr)	50	ns
Current - Reverse Leakage @ Vr	5	µA @ 50 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction (Max)	150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the CURC301-G is determined by the following mandatory parameters:

Electrical Compatibility Requirements:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 50 V
Current - Average Rectified (Io): Must equal or exceed 3 A
Package / Case: Must be DO-214AB or SMC equivalent
Mounting Type: Must be Surface Mount
RoHS Status: Must be ROHS3 Compliant
Moisture Sensitivity Level: Must be MSL 1 (Unlimited)

Secondary Parameters (Informational):

Voltage - Forward (Vf): Provided for performance comparison
Reverse Recovery Time (trr): Indicates speed classification
Current - Reverse Leakage: Indicates leakage characteristics
Operating Temperature Range: Indicates thermal capability

Substitute parts are grouped into two categories:

Category A - Direct Electrical Equivalents (Active Status): Parts with matching or superior electrical ratings and Active product status. These parts are recommended for new designs and ongoing production.

Category B - Functional Equivalents (Obsolete/Not For New Designs Status): Parts with matching electrical ratings but Obsolete or Not For New Designs status. These parts are suitable for replacement in existing applications but should not be selected for new designs.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V @ A]	trr [ns]	Ir @ Vr [µA @ V]	Speed	Package	Product Status
CURC301-G	Comchip Technology	50	3	1.0 @ 3	50	5 @ 50	Fast Recovery ≤ 500ns	DO-214AB (SMC)	Active
ES3A	Taiwan Semiconductor Corporation	50	3	0.95 @ 3	35	10 @ 50	Fast Recovery ≤ 500ns	DO-214AB (SMC)	Active
ES3A-13-F	Diodes Incorporated	50	3	0.9 @ 3	25	10 @ 50	Fast Recovery ≤ 500ns	DO-214AB (SMC)	Active
RS3A-13-F	Diodes Incorporated	50	3	1.3 @ 3	150	5 @ 50	Fast Recovery ≤ 500ns	DO-214AB (SMC)	Active
S3A-13-F	Diodes Incorporated	50	3	1.15 @ 3	2000	10 @ 50	Standard Recovery >500ns	DO-214AB (SMC)	Active
S3A	Diodes Incorporated	50	3	1.15 @ 3	2000	10 @ 50	Standard Recovery >500ns	DO-214AB (SMC)	Obsolete
SMLJ60S05-TP	Micro Commercial Co	50	6	1.0 @ 6	—	5 @ 50	Standard Recovery >500ns	DO-214AB (SMC)	Not For New Designs
S10A-TP	Micro Commercial Co	50	10	1.2 @ 10	—	10 @ 50	Standard Recovery >500ns	DO-214AB (HSMC)	Obsolete

Engineering Selection Recommendations

For Active Product Status (Recommended for New Designs):

ES3A-13-F (Diodes Incorporated) is the primary recommended substitute. This part maintains 50 V / 3 A electrical ratings, achieves superior reverse recovery time performance (25 ns versus 50 ns), and carries Active product status. Forward voltage is reduced to 0.9 V @ 3 A, indicating improved efficiency characteristics.

ES3A (Taiwan Semiconductor Corporation) provides equivalent electrical performance with 35 ns reverse recovery time and Active status. This part is suitable when packaging flexibility (non-tape & reel) is acceptable.

RS3A-13-F (Diodes Incorporated) maintains full electrical compatibility with Active status. Forward voltage is elevated to 1.3 V @ 3 A and reverse recovery time extends to 150 ns, indicating standard recovery speed classification. This part is suitable for applications where forward voltage margin is not critical.

S3A-13-F (Diodes Incorporated) provides electrical compatibility with Active status. This part operates with standard recovery speed (>500ns) and forward voltage of 1.15 V @ 3 A. Selection is appropriate for applications not requiring fast recovery characteristics.

For Obsolete or Not For New Designs Status:

S3A (Diodes Incorporated) and S10A-TP (Micro Commercial Co) carry Obsolete or Not For New Designs status. These parts are suitable only for replacement in existing applications where supply of the original part is unavailable. S10A-TP exceeds the 3 A current rating at 10 A and should not be selected as a direct substitute without circuit analysis.

SMLJ60S05-TP (Micro Commercial Co) carries Not For New Designs status and exceeds the 3 A current rating at 6 A. This part is suitable for replacement applications only.

Compliance Verification:

All substitute parts listed maintain RoHS3 compliance, MSL 1 (Unlimited) moisture sensitivity level, and REACH Unaffected status, matching the compliance profile of the CURC301-G.

Frequently Asked Questions (FAQ)

Q: Can ES3A-13-F be used as a direct replacement for CURC301-G in production?

A: Yes. ES3A-13-F maintains the required 50 V / 3 A electrical ratings, DO-214AB (SMC) package compatibility, surface mount configuration, and Active product status. The part demonstrates superior reverse recovery time performance (25 ns) and reduced forward voltage (0.9 V @ 3 A), making it suitable for direct substitution in new designs and ongoing production.

Q: What is the difference between Fast Recovery and Standard Recovery speed classifications?

A: Speed classification is determined by reverse recovery time (trr). Fast Recovery diodes exhibit trr ≤ 500 ns for currents > 200 mA, while Standard Recovery diodes exhibit trr > 500 ns. The CURC301-G is classified as Fast Recovery (50 ns). Substitute parts ES3A, ES3A-13-F, and RS3A-13-F maintain Fast Recovery classification. Parts S3A, S3A-13-F, SMLJ60S05-TP, and S10A-TP operate with Standard Recovery speed. Selection between these classifications depends on circuit switching frequency and EMI requirements.

Q: Why do some substitute parts have higher current ratings (6 A or 10 A) than the CURC301-G (3 A)?

A: Higher current-rated parts (SMLJ60S05-TP at 6 A, S10A-TP at 10 A) are electrically compatible because they meet or exceed the minimum 50 V voltage and 3 A current requirements. However, these parts are listed as Not For New Designs or Obsolete status. Selection of over-rated parts should be based on circuit requirements and thermal considerations, not as a substitute strategy for new designs.

Q: Are all substitute parts available in Tape & Reel (TR) packaging?

A: No. Packaging varies by part number. ES3A is available without specified packaging designation. ES3A-13-F, RS3A-13-F, S3A-13-F, and SMLJ60S05-TP are available in Tape & Reel (TR) or equivalent packaging. S10A-TP is available in Cut Tape (CT) & Digi-Reel® packaging. Verify packaging requirements with your procurement specification before final selection.

Q: What is the significance of forward voltage (Vf) differences among substitute parts?

A: Forward voltage directly affects power dissipation and circuit efficiency. The CURC301-G specifies 1.0 V @ 3 A. ES3A-13-F operates at 0.9 V @ 3 A (lower dissipation), while RS3A-13-F operates at 1.3 V @ 3 A (higher dissipation). For high-current or thermally constrained applications, lower forward voltage reduces heat generation. For low-current applications, forward voltage differences are typically negligible.

Q: Can S3A or S3A-13-F be used in new designs?

A: S3A carries Obsolete status and should not be selected for new designs. S3A-13-F carries Active status and is suitable for new designs. Both parts maintain 50 V / 3 A electrical compatibility and DO-214AB (SMC) package compatibility. However, both operate with Standard Recovery speed (>500ns, trr = 2000 ns), which differs from the CURC301-G Fast Recovery classification. Selection should be based on circuit switching frequency requirements.

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

A: MSL 1 indicates the lowest moisture sensitivity classification. Parts with MSL 1 have unlimited shelf life and do not require special moisture-controlled storage or handling procedures. All parts listed, including the CURC301-G and all substitutes, carry MSL 1 classification, ensuring equivalent moisture handling requirements.

Q: Are there any thermal operating range differences between substitute parts?

A: Yes. The CURC301-G specifies maximum junction temperature of 150°C without a minimum specification. ES3A, ES3A-13-F, RS3A-13-F, S3A-13-F, and S3A specify operating temperature ranges from -55°C or -65°C to 150°C. SMLJ60S05-TP and S10A-TP specify -55°C to 150°C. All parts support the same maximum junction temperature (150°C). Verify minimum operating temperature requirements for your application.

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