S8MCHR7G Equivalent & Substitute Parts

Part Overview

The S8MCHR7G is a general-purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 1000 V DC reverse voltage and 8 A average rectified current in a DO-214AB (SMC) surface mount package. This component is classified as discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement requirements. The part carries automotive-grade qualification (AEC-Q101) 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)	8	A
Voltage - Forward (Vf) (Max) @ If	985 mV @ 8 A	mV
Speed	Standard Recovery >500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	10	µA @ 1000 V
Mounting Type	Surface Mount	—
Package / Case	DO-214AB, SMC	—
Operating Temperature - Junction	-55 to 150	°C
Grade	Automotive	—
Qualification	AEC-Q101	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the S8MCHR7G requires matching or exceeding the following critical electrical and mechanical parameters:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 1000 V minimum
Package / Case: DO-214AB (SMC) surface mount form factor
Mounting Type: Surface Mount
RoHS Compliance: ROHS3 Compliant

Current Rating Consideration: The S8MCHR7G is rated for 8 A average rectified current. Substitute parts with lower current ratings (3 A or 5 A) operate within reduced current envelopes and are classified as partial substitutes suitable only for applications requiring lower current delivery. Substitute parts with equal or higher current ratings provide direct functional equivalence.

Recovery Speed: The S8MCHR7G employs standard recovery characteristics (>500 ns). Substitute parts with fast recovery (≤500 ns) or ultrafast recovery (≤75 ns) characteristics are electrically compatible and provide improved switching performance without functional degradation.

Temperature Range: Operating temperature ranges must encompass the application's thermal requirements. The S8MCHR7G operates from -55°C to 150°C. Substitute parts with equal or wider temperature ranges maintain thermal compatibility.

Compliance & Qualification: The S8MCHR7G carries automotive-grade qualification (AEC-Q101). Substitute parts without explicit automotive qualification are suitable for non-automotive applications only.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	Speed	Ir @ Vr [µA]	Package	Temp Range [°C]	Product Status
S8MCHR7G	Taiwan Semiconductor Corporation	1000	8	985 @ 8A	Standard >500ns	10 @ 1000V	DO-214AB (SMC)	-55 to 150	Discontinued
CFRC307-G	Comchip Technology	1000	3	1300 @ 3A	Fast ≤500ns	5 @ 1000V	DO-214AB (SMC)	-40 to 150	Active
CGRC507-G	Comchip Technology	1000	5	1150 @ 5A	Standard >500ns	10 @ 1000V	DO-214AB (SMC)	-40 to 150	Active
CURC307-G	Comchip Technology	1000	3	1700 @ 3A	Fast ≤500ns	5 @ 1000V	DO-214AB (SMC)	-40 to 150	Active
ER3M-TP	Micro Commercial Co	1000	3	1700 @ 3A	Fast ≤500ns	5 @ 1000V	DO-214AB (SMC)	-50 to 175	Active
RS3M-13-F	Diodes Incorporated	1000	3	1300 @ 3A	Fast ≤500ns	5 @ 1000V	DO-214AB (SMC)	-65 to 150	Active
RS3MB-13-F	Diodes Incorporated	1000	3	1300 @ 3A	Fast ≤500ns	5 @ 1000V	DO-214AA (SMB)	-65 to 150	Active
S3M	Diotec Semiconductor	1000	3	1150 @ 3A	Standard >500ns	5 @ 1000V	DO-214AB (SMC)	-50 to 150	Active
S3M-13-F	Diodes Incorporated	1000	3	1150 @ 3A	Standard >500ns	10 @ 1000V	DO-214AB (SMC)	-65 to 150	Active
S3M-TP	Micro Commercial Co	1000	3	1200 @ 3A	Standard >500ns	10 @ 1000V	DO-214AB (SMC)	-55 to 150	Active
S3MB-13-F	Diodes Incorporated	1000	3	1150 @ 3A	Standard >500ns	10 @ 1000V	DO-214AA (SMB)	-65 to 150	Active

Engineering Selection Recommendations

Direct Substitutes (Equivalent Current Rating):

No substitute parts with 8 A current rating are available in the provided dataset. The S8MCHR7G remains the only 8 A option in the DO-214AB package category.

Partial Substitutes (Reduced Current Rating - 3 A to 5 A):

Partial substitutes are applicable only in applications where the circuit design permits operation at reduced current levels. The following parts maintain 1000 V reverse voltage rating and DO-214AB package compatibility:

CGRC507-G (Comchip Technology): 5 A rating with standard recovery characteristics matches the S8MCHR7G recovery speed profile. Active product status with ROHS3 compliance.
S3M-TP (Micro Commercial Co): 3 A rating with standard recovery characteristics. Operating temperature range (-55°C to 150°C) matches the S8MCHR7G specification. Active product status with ROHS3 compliance and highest inventory availability (321,300 units).
S3M-13-F (Diodes Incorporated): 3 A rating with standard recovery characteristics. Extended lower temperature limit (-65°C) provides wider thermal envelope. Active product status with ROHS3 compliance.

Package Variant Consideration:

Parts designated with SMB package (DO-214AA) such as RS3MB-13-F and S3MB-13-F are mechanically incompatible with DO-214AB footprints and require PCB redesign.

Compliance Status:

All recommended substitute parts carry ROHS3 compliance. The S8MCHR7G automotive-grade qualification (AEC-Q101) is not replicated in the substitute parts listed; therefore, substitutes are suitable for non-automotive applications only.

Frequently Asked Questions (FAQ)

Q: Can I use a 3 A or 5 A rated diode in place of the 8 A S8MCHR7G?

A: Substitution is possible only if the application circuit design operates at or below the substitute part's current rating. The substitute part must not be subjected to currents exceeding its average rectified current specification. Circuit analysis is required to confirm current envelope compatibility.

Q: What is the difference between DO-214AB (SMC) and DO-214AA (SMB) packages?

A: DO-214AB (SMC) and DO-214AA (SMB) are distinct surface mount packages with different physical dimensions and PCB footprints. Parts specified for SMB package are not mechanically compatible with SMC footprints without PCB redesign.

Q: Does the S8MCHR7G automotive qualification (AEC-Q101) affect substitute part selection?

A: Yes. The S8MCHR7G carries automotive-grade qualification. Substitute parts in the provided dataset do not carry explicit automotive qualification and are suitable for non-automotive applications only. Automotive applications require parts with equivalent AEC-Q101 qualification.

Q: What is the significance of recovery speed (Standard vs. Fast vs. Ultrafast)?

A: Recovery speed defines the time required for the diode to transition from forward conduction to reverse blocking state. Standard recovery (>500 ns) is suitable for general-purpose rectification. Fast recovery (≤500 ns) and ultrafast recovery (≤75 ns) provide improved switching characteristics and reduced switching losses, beneficial in high-frequency applications. Substituting a standard recovery diode with a faster recovery type does not cause functional degradation.

Q: Are there inventory considerations for substitute part selection?

A: Yes. Inventory availability varies significantly across substitute parts. S3M-TP (Micro Commercial Co) maintains the highest inventory level (321,300 units), while CURC307-G (Comchip Technology) provides 12,100 units. Discontinued status of the S8MCHR7G (710 units remaining) indicates limited availability for direct replacement.

Q: What parameters must match exactly for a valid substitution?

A: Voltage rating (1000 V minimum), package type (DO-214AB for SMC compatibility), and mounting type (surface mount) must match exactly. Current rating must equal or exceed the application requirement. Operating temperature range must encompass the application's thermal environment. RoHS compliance status must satisfy regulatory requirements.

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