Equivalent & Substitute Parts for S1M-26R2

Part Overview

The S1M-26R2 is a general-purpose rectifier diode rated for 1000 V DC reverse voltage and 1 A average rectified current in a surface mount DO-214AC (SMA) package. Manufactured by Taiwan Semiconductor Corporation, this component is classified as Active and complies with RoHS3 and REACH standards. Substitute parts become necessary when the primary part experiences supply constraints, extended lead times, or when design flexibility across multiple suppliers is required while maintaining equivalent electrical and mechanical performance.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	1000	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.1 @ 1	V @ A
Speed	Standard Recovery >500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	1.5	µs
Current - Reverse Leakage @ Vr	1	µA @ 1000 V
Operating Temperature - Junction	-55 to 175	°C
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the S1M-26R2 is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

Voltage - DC Reverse (Vr) (Max): 1000 V
Current - Average Rectified (Io): 1 A
Voltage - Forward (Vf) (Max) @ If: 1.1 V @ 1 A
Operating Temperature - Junction: -55°C to 175°C

Mechanical Equivalence Criteria:

Package / Case: DO-214AC, SMA
Mounting Type: Surface Mount

Compliance Criteria:

RoHS3 Compliant
REACH Unaffected

The substitute part MRA4007T3G (onsemi) meets all electrical and mechanical requirements. Substitution is valid when the application does not impose additional constraints beyond the parameters listed above. Differences in reverse leakage current (1 µA for S1M-26R2 versus 10 µA for MRA4007T3G) and capacitance specifications do not preclude substitution for general-purpose rectification applications operating within the specified parameter ranges.

Parameter Comparison

Parameter	S1M-26R2 (Taiwan Semiconductor)	MRA4007T3G (onsemi)	Match Status
Voltage - DC Reverse (Vr) (Max)	1000 V	1000 V	Equivalent
Current - Average Rectified (Io)	1 A	1 A	Equivalent
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 1 A	1.1 V @ 1 A	Equivalent
Speed	Standard Recovery >500ns, > 200mA (Io)	Standard Recovery >500ns, > 200mA (Io)	Equivalent
Operating Temperature - Junction	-55°C to 175°C	-55°C to 175°C	Equivalent
Package / Case	DO-214AC, SMA	DO-214AC, SMA	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Current - Reverse Leakage @ Vr	1 µA @ 1000 V	10 µA @ 1000 V	Different
Product Status	Active	Not For New Designs	Different

Engineering Selection Recommendations

Primary Part (S1M-26R2): Select this part for new designs requiring active product status and lower reverse leakage current specifications (1 µA @ 1000 V). Taiwan Semiconductor Corporation maintains this component in active production with full RoHS3 compliance and REACH unaffected status.

Substitute Part (MRA4007T3G): This onsemi component provides electrical and mechanical equivalence for applications where reverse leakage current tolerance permits 10 µA @ 1000 V operation. The part is classified as "Not For New Designs," indicating it remains available for legacy system support and replacement applications but is not recommended for new product development. Both parts share identical voltage, current, and temperature ratings with equivalent forward voltage characteristics and recovery speed specifications.

Selection between these parts depends on design phase and supply availability. For new designs, the S1M-26R2 is the preferred choice. For existing systems or when S1M-26R2 availability is constrained, MRA4007T3G provides functional equivalence within the stated parameter tolerances.

Frequently Asked Questions (FAQ)

Q: Can MRA4007T3G replace S1M-26R2 in existing applications?

A: Yes. Both parts share identical voltage ratings (1000 V), current ratings (1 A), forward voltage characteristics (1.1 V @ 1 A), and operating temperature range (-55°C to 175°C). The primary difference is reverse leakage current: S1M-26R2 specifies 1 µA while MRA4007T3G specifies 10 µA at 1000 V. Substitution is valid for applications where this leakage current difference does not impact circuit performance.

Q: Why is MRA4007T3G marked "Not For New Designs"?

A: This designation indicates the part is in mature or declining production status. onsemi maintains supply for legacy systems and replacement applications but does not recommend it for new product development. For new designs, S1M-26R2 (Active status) is the appropriate selection.

Q: Are the packages identical between S1M-26R2 and MRA4007T3G?

A: Yes. Both components use the DO-214AC (SMA) surface mount package. PCB footprints and reflow soldering profiles are compatible between the two parts.

Q: What is the significance of the 1 µA versus 10 µA reverse leakage current difference?

A: Reverse leakage current affects power dissipation and circuit performance in high-impedance applications. The S1M-26R2 specification of 1 µA provides lower leakage. Applications sensitive to reverse leakage should use S1M-26R2. General-purpose rectification applications typically tolerate the 10 µA leakage of MRA4007T3G without performance degradation.

Q: Are both parts RoHS3 compliant?

A: Yes. Both S1M-26R2 and MRA4007T3G are ROHS3 Compliant and REACH Unaffected, meeting current environmental and regulatory requirements for electronic components.

Q: Can these parts be used interchangeably on the same PCB assembly?

A: Yes. Identical package geometry (DO-214AC, SMA) and surface mount configuration allow direct substitution on PCB layouts. No design modifications are required for mechanical or electrical interface compatibility.

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