S12MCHR7G Equivalent & Substitute Parts

Part Overview

The S12MCHR7G is a general-purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 1000 V DC reverse voltage and 12 A average rectified current in a DO-214AB (SMC) surface mount package. This part is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design requirements and production needs. The device features fast recovery characteristics with reverse recovery time ≤ 500 ns and operates across a junction temperature range of -55°C to 150°C.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	1000	V
Current - Average Rectified (Io)	12	A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 12 A	V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	1	µA @ 1000 V
Mounting Type	Surface Mount	—
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

Substitution of the S12MCHR7G is constrained by the following critical parameters:

Voltage Rating: All substitute parts must maintain a DC reverse voltage rating of 1000 V to ensure equivalent electrical performance in the application circuit.

Current Rating: The S12MCHR7G is rated for 12 A average rectified current. Substitute parts with lower current ratings (3 A, 5 A) are not direct equivalents and represent downrated alternatives suitable only for applications with reduced current requirements.

Package Type: The DO-214AB (SMC) surface mount package is the primary package specification. Substitute parts in alternative packages (DO-214AA/SMB) require PCB layout modification and are not pin-compatible.

Speed Classification: Fast recovery diodes with reverse recovery time ≤ 500 ns are functionally equivalent. Standard recovery diodes (> 500 ns) represent a different speed class and are not direct substitutes.

Compliance & Status: All listed substitute parts maintain ROHS3 compliance, MSL 1 rating, and active product status, ensuring long-term availability and regulatory alignment.

The substitute parts listed below are grouped by current rating and speed characteristics. Parts rated at 3 A or 5 A current are lower-current alternatives and do not provide equivalent current-handling capacity to the 12 A S12MCHR7G.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	Speed Class	Package	Tj Range [°C]	Product Status
S12MCHR7G	Taiwan Semiconductor Corporation	1000	12	1.1 @ 12 A	Fast Recovery ≤ 500ns	DO-214AB (SMC)	-55 to 150	Discontinued
CFRC307-G	Comchip Technology	1000	3	1.3 @ 3 A	Fast Recovery ≤ 500ns	DO-214AB (SMC)	–	Active
CGRC507-G	Comchip Technology	1000	5	1.15 @ 5 A	Standard Recovery > 500ns	DO-214AB (SMC)	–	Active
CURC307-G	Comchip Technology	1000	3	1.7 @ 3 A	Fast Recovery ≤ 500ns (75 ns trr)	DO-214AB (SMC)	–	Active
ER3M-TP	Micro Commercial Co	1000	3	1.7 @ 3 A	Fast Recovery ≤ 500ns (75 ns trr)	DO-214AB (SMC)	-50 to 175	Active
RS3M-13-F	Diodes Incorporated	1000	3	1.3 @ 3 A	Fast Recovery ≤ 500ns	DO-214AB (SMC)	-65 to 150	Active
RS3MB-13-F	Diodes Incorporated	1000	3	1.3 @ 3 A	Fast Recovery ≤ 500ns	DO-214AA (SMB)	-65 to 150	Active
S3M	Diotec Semiconductor	1000	3	1.15 @ 3 A	Standard Recovery > 500ns	DO-214AB (SMC)	-50 to 150	Active
S3M-13-F	Diodes Incorporated	1000	3	1.15 @ 3 A	Standard Recovery > 500ns	DO-214AB (SMC)	-65 to 150	Active
S3M-TP	Micro Commercial Co	1000	3	1.2 @ 3 A	Standard Recovery > 500ns	DO-214AB (SMC)	-55 to 150	Active
S3MB-13-F	Diodes Incorporated	1000	3	1.15 @ 3 A	Standard Recovery > 500ns	DO-214AA (SMB)	-65 to 150	Active

Engineering Selection Recommendations

Direct Equivalents (Same Current Rating): No substitute parts are available with a 12 A current rating in the provided list. The S12MCHR7G remains unique in its 12 A specification within the available alternatives.

Lower-Current Alternatives (3 A and 5 A Ratings): The listed substitute parts are rated for 3 A or 5 A average rectified current and are suitable only for applications where the circuit current requirement does not exceed these ratings. These parts are not direct replacements for the 12 A S12MCHR7G but serve as alternatives for reduced-current designs.

Package Compatibility: Parts designated with SMC package (DO-214AB) are pin-compatible with the S12MCHR7G. Parts designated with SMB package (DO-214AA) require PCB layout modification and are not mechanically interchangeable.

Speed Classification: Fast recovery diodes (CFRC307-G, CURC307-G, ER3M-TP, RS3M-13-F, RS3MB-13-F) maintain the ≤ 500 ns recovery time specification of the S12MCHR7G. Standard recovery diodes (CGRC507-G, S3M, S3M-13-F, S3M-TP, S3MB-13-F) have recovery times exceeding 500 ns and are not functionally equivalent for high-frequency switching applications.

Compliance & Availability: All listed substitute parts maintain ROHS3 compliance and MSL 1 rating. All substitute parts carry active product status, ensuring continued availability and supply chain stability.

Temperature Range: The S12MCHR7G operates from -55°C to 150°C. Substitute parts with extended temperature ranges (ER3M-TP: -50°C to 175°C; RS3M-13-F, RS3MB-13-F, S3M-13-F, S3MB-13-F: -65°C to 150°C) provide broader operational flexibility.

Frequently Asked Questions (FAQ)

Q: Can a 3 A rated diode substitute for the 12 A S12MCHR7G?

A: No. The 3 A rated parts (CFRC307-G, CURC307-G, ER3M-TP, RS3M-13-F, RS3MB-13-F, S3M, S3M-13-F, S3M-TP, S3MB-13-F) are rated for one-quarter the current capacity of the S12MCHR7G. Substitution is only valid for applications with maximum circuit current not exceeding 3 A. Exceeding the rated current causes thermal stress and device failure.

Q: What is the difference between fast recovery and standard recovery diodes?

A: Fast recovery diodes have reverse recovery time ≤ 500 ns, while standard recovery diodes exceed 500 ns. Fast recovery diodes are required for high-frequency switching applications (> 1 kHz) to minimize switching losses and electromagnetic interference. Standard recovery diodes are suitable for low-frequency rectification and power supply applications where switching speed is not critical.

Q: Are SMC and SMB packages interchangeable?

A: No. SMC (DO-214AB) and SMB (DO-214AA) are different surface mount packages with different footprints and pin spacing. Parts in SMB package (RS3MB-13-F, S3MB-13-F) require PCB redesign and are not pin-compatible with SMC footprints. Mechanical and electrical verification is required before substitution.

Q: What does ROHS3 compliance mean?

A: ROHS3 compliance indicates the part meets the Restriction of Hazardous Substances Directive 3, restricting the use of lead, cadmium, mercury, hexavalent chromium, and certain brominated flame retardants. All listed substitute parts are ROHS3 compliant, ensuring regulatory alignment with environmental standards.

Q: Does MSL 1 rating affect handling and storage?

A: MSL 1 (Moisture Sensitivity Level 1) indicates unlimited shelf life with no special moisture control requirements during storage or handling. All listed parts carry MSL 1 rating, eliminating the need for dry-pack storage or baking procedures prior to assembly.

Q: Why is the S12MCHR7G discontinued?

A: The S12MCHR7G is discontinued at DiGi Electronics. Discontinuation does not indicate a defect but reflects manufacturer or distributor supply decisions. Existing inventory (731 pcs) remains available, but long-term sourcing requires identification of alternative parts for future production runs.

Q: Can forward voltage (Vf) differences affect circuit performance?

A: Yes. Forward voltage differences directly impact voltage drop across the diode during conduction. The S12MCHR7G exhibits 1.1 V @ 12 A, while substitute 3 A parts range from 1.15 V to 1.7 V @ 3 A. In precision rectification circuits, these differences affect output voltage regulation and efficiency. Circuit simulation or testing is necessary to validate performance with substitute parts.

Q: What is reverse leakage current and why does it matter?

A: Reverse leakage current is the small current flowing through the diode when reverse biased. The S12MCHR7G exhibits 1 µA @ 1000 V, while substitute parts range from 5 µA to 10 µA. Higher leakage increases power dissipation and heat generation, particularly in high-voltage applications. For precision analog circuits, leakage differences may require circuit redesign.

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