RS1M Equivalent & Substitute Parts

Part Overview

The RS1M is a general-purpose rectifier diode manufactured by onsemi, rated for 1000 V DC reverse voltage and 1 A average rectified current in a DO-214AC (SMA) surface mount package. This device features fast recovery characteristics with a reverse recovery time of 500 ns and operates across a junction temperature range of -55°C to 150°C. The RS1M is classified as "Not For New Designs," indicating that while functional and available in inventory, alternative components with active product status are preferred for new circuit development. Identifying equivalent and substitute parts is necessary to support ongoing production requirements, design flexibility, and supply chain continuity.

Key Parameters

Parameter	RS1M Value	Unit
Voltage - DC Reverse (Vr) (Max)	1000	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.3 @ 1 A	V
Speed Classification	Fast Recovery ≤ 500ns	-
Reverse Recovery Time (trr)	500	ns
Current - Reverse Leakage @ Vr	5 @ 1000 V	µA
Package / Case	DO-214AC, SMA	-
Mounting Type	Surface Mount	-
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitute parts for the RS1M are grouped based on the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 1000 V minimum
Current - Average Rectified (Io): 1 A minimum
Package / Case: DO-214AC (SMA) or compatible surface mount package
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant

Secondary Compatibility Factors:

Voltage - Forward (Vf) (Max) @ If: 1.3 V or lower at rated current
Speed Classification: Fast Recovery (≤ 500ns) or Standard Recovery (>500ns)
Reverse Recovery Time (trr): 500 ns or faster
Operating Temperature Range: -55°C minimum to 150°C minimum

Parts are classified into three substitution categories:

Direct Equivalents: Parts with identical or superior electrical ratings, same package type, and active product status (CFRA107-G, RGF1M-E3/67A, CMR1F-10M BK PBFREE, RS1M-13-F, CMR1-10M TR13 PBFREE, CGRA4007-G).

Similar Alternatives: Parts meeting core voltage and current requirements with the same package but differing in recovery speed or forward voltage characteristics (MRA4007T3G, MRA4006T3G, RS1K).

Enhanced Performance Options: Parts exceeding base specifications in current rating or recovery time while maintaining voltage and package compatibility (BYG21M-E3/TR).

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	Speed	trr [ns]	Package	Tj Range [°C]	Product Status
RS1M	onsemi	1000	1	1.3 @ 1 A	Fast Recovery ≤ 500ns	500	DO-214AC (SMA)	-55 to 150	Not For New Designs
CFRA107-G	Comchip Technology	1000	1	1.3 @ 1 A	Fast Recovery ≤ 500ns	500	DO-214AC (SMA)	-55 to 150	Active
RGF1M-E3/67A	Vishay General Semiconductor - Diodes Division	1000	1	1.3 @ 1 A	Fast Recovery ≤ 500ns	500	DO-214BA (GF1)	-65 to 175	Active
CMR1F-10M BK PBFREE	Central Semiconductor Corp	1000	1	1.3 @ 1 A	Fast Recovery ≤ 500ns	500	DO-214AC (SMA)	-65 to 150	Active
RS1M-13-F	Diodes Incorporated	1000	1	1.3 @ 1 A	Fast Recovery ≤ 500ns	500	DO-214AC (SMA)	-65 to 150	Active
CMR1-10M TR13 PBFREE	Central Semiconductor Corp	1000	1	1.1 @ 1 A	Standard Recovery >500ns	-	DO-214AC (SMA)	-65 to 150	Active
MRA4007T3G	onsemi	1000	1	1.1 @ 1 A	Standard Recovery >500ns	-	DO-214AC (SMA)	-55 to 175	Not For New Designs
CGRA4007-G	Comchip Technology	1000	1	1.1 @ 1 A	Standard Recovery >500ns	-	DO-214AC (SMA)	-55 to 150	Active
MRA4006T3G	onsemi	800	1	1.1 @ 1 A	Standard Recovery >500ns	-	DO-214AC (SMA)	-55 to 175	Not For New Designs
RS1K	Fairchild Semiconductor	800	1	1.3 @ 1 A	Fast Recovery ≤ 500ns	500	DO-214AC (SMA)	-55 to 150	Active
BYG21M-E3/TR	Vishay General Semiconductor - Diodes Division	1000	1.5	1.6 @ 1.5 A	Fast Recovery ≤ 500ns	120	DO-214AC (SMA)	-55 to 150	Active

Engineering Selection Recommendations

Direct Replacement (Identical Electrical and Mechanical Specifications):

CFRA107-G, CMR1F-10M BK PBFREE, RS1M-13-F, and CMR1-10M TR13 PBFREE are direct equivalents to the RS1M. All four parts maintain 1000 V reverse voltage, 1 A average rectified current, and DO-214AC (SMA) package compatibility. CFRA107-G, CMR1F-10M BK PBFREE, and RS1M-13-F carry Active product status, making them suitable for new designs. CMR1-10M TR13 PBFREE also carries Active status. These parts are preferred for applications requiring exact electrical performance matching.

Package-Compatible Alternatives with Voltage Equivalence:

RGF1M-E3/67A (Vishay) provides identical electrical specifications but uses the DO-214BA (GF1) package instead of DO-214AC (SMA). This part is suitable only if the PCB layout and assembly process accommodate the alternative package footprint. RGF1M-E3/67A carries Active product status and offers an extended operating temperature range (-65°C to 175°C).

Lower Voltage Alternatives:

MRA4006T3G and RS1K are rated for 800 V reverse voltage instead of 1000 V. These parts are suitable only for applications where the circuit design operates at or below 800 V. MRA4006T3G carries "Not For New Designs" status, while RS1K carries Active status. Both maintain 1 A current rating and DO-214AC (SMA) package compatibility.

Enhanced Performance Option:

BYG21M-E3/TR (Vishay SUPERECTIFIER® series) exceeds the RS1M specifications with 1.5 A average rectified current and 120 ns reverse recovery time. This part is suitable for applications requiring higher current capacity or faster switching performance while maintaining 1000 V voltage rating and DO-214AC (SMA) package compatibility. BYG21M-E3/TR carries Active product status.

Compliance and Certification:

All substitute parts listed are ROHS3 Compliant and carry REACH Unaffected status, matching the RS1M compliance profile. All parts are classified under ECCN EAR99 and HTSUS 8541.10.0080.

Frequently Asked Questions (FAQ)

Q: Can MRA4006T3G be used as a direct substitute for RS1M?

A: MRA4006T3G is not a direct substitute. While both parts share the same 1 A current rating and DO-214AC (SMA) package, MRA4006T3G is rated for 800 V reverse voltage compared to RS1M's 1000 V rating. MRA4006T3G is suitable only for applications operating at 800 V or below. Additionally, MRA4006T3G carries "Not For New Designs" status.

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

A: Fast recovery diodes have a reverse recovery time of 500 ns or less, while standard recovery diodes exceed 500 ns. Fast recovery diodes are preferred in high-frequency switching applications where reduced switching losses are critical. RS1M features fast recovery (500 ns), while CMR1-10M TR13 PBFREE and CGRA4007-G feature standard recovery. The choice depends on circuit switching frequency requirements.

Q: Is RGF1M-E3/67A compatible with RS1M PCB layouts?

A: RGF1M-E3/67A uses the DO-214BA (GF1) package, which differs from RS1M's DO-214AC (SMA) package. PCB footprints are not interchangeable without layout modification. Verify footprint compatibility with your PCB design before selecting this part.

Q: Why would I choose BYG21M-E3/TR over RS1M?

A: BYG21M-E3/TR is selected when higher current capacity (1.5 A versus 1 A) or faster switching performance (120 ns reverse recovery versus 500 ns) is required. Both parts maintain 1000 V voltage rating and DO-214AC (SMA) package compatibility. BYG21M-E3/TR carries Active product status, making it suitable for new designs.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed are ROHS3 Compliant with Moisture Sensitivity Level 1 (Unlimited), matching the RS1M compliance profile.

Q: What is the primary reason to select an Active product status part over RS1M?

A: RS1M carries "Not For New Designs" status, indicating onsemi has discontinued active development and support for this part. For new circuit designs, Active status parts such as CFRA107-G, RS1M-13-F, CMR1F-10M BK PBFREE, or CMR1-10M TR13 PBFREE are preferred to ensure long-term supply availability and manufacturer support.

Q: Can RS1K be used in place of RS1M?

A: RS1K is suitable only for applications operating at 800 V or below. RS1K shares the same 1 A current rating, fast recovery characteristics (500 ns), and DO-214AC (SMA) package as RS1M. RS1K carries Active product status. However, if your circuit requires 1000 V voltage rating, RS1K is not appropriate.

Q: What forward voltage differences exist among substitute parts?

A: RS1M, CFRA107-G, CMR1F-10M BK PBFREE, and RS1M-13-F specify 1.3 V maximum forward voltage at 1 A. CMR1-10M TR13 PBFREE, MRA4007T3G, and CGRA4007-G specify 1.1 V maximum forward voltage at 1 A. Lower forward voltage reduces power dissipation in high-current applications. Select based on thermal design requirements.

Q: Are there inventory considerations when selecting substitutes?

A: Inventory levels vary significantly among substitute parts. RS1M-13-F has 189,953 pieces in stock, while CFRA107-G has only 894 pieces. Verify current inventory availability with your supplier before finalizing part selection for production quantities.

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