RS2M-13 Equivalent & Substitute Parts

Part Overview

The RS2M-13 is a general-purpose rectifier diode rated for 1000 V DC reverse voltage and 1.5 A average rectified current in a Surface Mount SMB (DO-214AA) package. This diode is classified as discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design support and procurement.

The part employs fast recovery technology with a reverse recovery time of 500 ns, suitable for standard rectification applications requiring moderate switching speeds. RoHS non-compliance status and non-affected REACH classification define its regulatory profile.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	1000	V
Current - Average Rectified (Io)	1.5	A
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 1.5 A	V
Reverse Recovery Time (trr)	500	ns
Current - Reverse Leakage @ Vr	5	µA @ 1000 V
Capacitance @ Vr, F	30	pF @ 4V, 1MHz
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-65 to 150	°C
Technology	Standard	—

Substitute Part Grouping Explanation

Substitution of the RS2M-13 is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 1000 V
Current - Average Rectified (Io): Must equal or exceed 1.5 A
Package / Case: Must be DO-214AA, SMB (Surface Mount)
Mounting Type: Must be Surface Mount

Secondary Compatibility Criteria:

Voltage - Forward (Vf) (Max): Should not significantly exceed 1.3 V @ rated current to maintain thermal and efficiency characteristics
Reverse Recovery Time (trr): Fast recovery (≤500 ns) preferred for switching performance consistency
Operating Temperature Range: Must accommodate -65°C to 150°C junction temperature range
Current - Reverse Leakage: Should not exceed 5 µA @ rated voltage to maintain blocking characteristics

Substitute parts are grouped into two categories:

Category 1 - Direct Parametric Equivalents: Parts matching all mandatory criteria with identical or superior electrical performance within the specified parameter ranges.

Category 2 - Functional Substitutes: Parts meeting mandatory criteria with trade-offs in secondary parameters (such as higher current rating, different recovery speed, or modified forward voltage) that remain functionally compatible within the application envelope.

Parameter Comparison

Parameter	RS2M-13	RS2M-13-F	S2M-E3/5BT	CFRB207-G	STTH208U
Manufacturer	Diodes Incorporated	Diodes Incorporated	Vishay General Semiconductor - Diodes Division	Comchip Technology	STMicroelectronics
Voltage - DC Reverse (Vr) (Max)	1000 V	1000 V	1000 V	1000 V	800 V
Current - Average Rectified (Io)	1.5 A	1.5 A	1.5 A	2 A	2 A
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 1.5 A	1.3 V @ 1.5 A	1.15 V @ 1.5 A	1.3 V @ 2 A	1.65 V @ 2 A
Reverse Recovery Time (trr)	500 ns	500 ns	2 µs	500 ns	75 ns
Current - Reverse Leakage @ Vr	5 µA @ 1000 V	5 µA @ 1000 V	1 µA @ 1000 V	5 µA @ 1000 V	5 µA @ 800 V
Capacitance @ Vr, F	30 pF @ 4V, 1MHz	30 pF @ 4V, 1MHz	16 pF @ 4V, 1MHz	—	—
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Operating Temperature - Junction	-65 to 150 °C	-65 to 150 °C	-55 to 150 °C	150 °C (Max)	175 °C (Max)
Product Status	Discontinued at DiGi Electronics	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

RS2M-13-F (Diodes Incorporated)

The RS2M-13-F is the primary equivalent substitute. It maintains identical electrical specifications to the RS2M-13 across all critical parameters: 1000 V reverse voltage, 1.5 A average rectified current, 1.3 V forward voltage at 1.5 A, and 500 ns reverse recovery time. The sole difference is packaging format (Tape & Reel versus Cut Tape) and product status (Active versus Discontinued). The RS2M-13-F carries ROHS3 compliance, addressing regulatory requirements where the original part does not. This part is recommended as the direct replacement for new designs and ongoing production.

S2M-E3/5BT (Vishay General Semiconductor - Diodes Division)

The S2M-E3/5BT meets all mandatory compatibility criteria with 1000 V reverse voltage and 1.5 A current rating in DO-214AA SMB package. It exhibits superior reverse leakage performance (1 µA versus 5 µA) and lower forward voltage (1.15 V versus 1.3 V at 1.5 A), resulting in reduced power dissipation. The reverse recovery time is 2 µs (standard recovery), which differs from the 500 ns fast recovery specification of the RS2M-13. This part is suitable for applications where switching speed is not a critical constraint and lower forward voltage drop is beneficial. ROHS3 compliance is provided.

CFRB207-G (Comchip Technology)

The CFRB207-G exceeds the mandatory voltage and current specifications with 1000 V reverse voltage and 2 A average rectified current. It maintains 500 ns reverse recovery time and 1.3 V forward voltage at its rated 2 A current. The higher current rating provides design margin for applications approaching the 1.5 A limit. Operating temperature maximum is specified as 150°C (not a range), which accommodates the upper bound of the RS2M-13 range. ROHS3 compliance is provided. This part is suitable where increased current capacity is required within the same voltage class.

STTH208U (STMicroelectronics)

The STTH208U operates at 800 V reverse voltage, which is below the 1000 V specification of the RS2M-13. This part does not meet the mandatory voltage requirement and is not recommended as a direct substitute for applications requiring full 1000 V blocking capability. However, it is listed in the original substitute field and may be considered only for applications where the actual operating voltage is confirmed to be 800 V or lower. The part offers superior reverse recovery time (75 ns) and higher current rating (2 A). ROHS3 compliance is provided.

Frequently Asked Questions (FAQ)

Q: Can RS2M-13-F be used as a direct replacement for RS2M-13?

A: Yes. The RS2M-13-F is electrically identical to the RS2M-13 across all critical parameters: 1000 V reverse voltage, 1.5 A average rectified current, 1.3 V forward voltage, and 500 ns reverse recovery time. The difference is packaging format (Tape & Reel versus Cut Tape) and product status (Active versus Discontinued). RS2M-13-F is ROHS3 compliant, whereas RS2M-13 is not.

Q: What is the difference between fast recovery (500 ns) and standard recovery (2 µs) diodes?

A: Recovery time refers to the interval required for a diode to transition from forward conduction to reverse blocking when the applied voltage reverses. Fast recovery diodes (≤500 ns) are suitable for higher-frequency switching applications and power supplies requiring rapid switching transitions. Standard recovery diodes (>500 ns) are adequate for lower-frequency rectification and general-purpose applications. The S2M-E3/5BT uses standard recovery technology, making it suitable for applications not requiring fast switching performance.

Q: Can STTH208U replace RS2M-13 in all applications?

A: No. The STTH208U is rated for 800 V reverse voltage, which is 200 V below the 1000 V specification of the RS2M-13. It does not meet the mandatory voltage requirement and must not be used in applications requiring full 1000 V blocking capability. Use STTH208U only in applications where the actual operating voltage is confirmed to be 800 V or lower.

Q: What are the advantages of CFRB207-G over RS2M-13?

A: The CFRB207-G provides a higher average rectified current rating (2 A versus 1.5 A) while maintaining the same 1000 V reverse voltage and 500 ns reverse recovery time. This higher current rating provides design margin and thermal headroom for applications approaching the 1.5 A limit of the RS2M-13. Both parts use identical DO-214AA SMB packaging.

Q: Is the operating temperature range important for substitution?

A: Yes. The RS2M-13 specifies a junction temperature range of -65°C to 150°C. Substitute parts must accommodate this range or be confirmed suitable for the actual operating environment. The S2M-E3/5BT specifies -55°C to 150°C, which does not extend to -65°C. The CFRB207-G and STTH208U specify only maximum temperatures (150°C and 175°C respectively) without lower bounds. Verify that the substitute part's temperature specification matches application requirements.

Q: What does ROHS3 compliance mean?

A: ROHS3 compliance indicates conformance to the Restriction of Hazardous Substances Directive 2011/65/EU, which restricts the use of specific hazardous materials in electrical and electronic equipment. The RS2M-13 is RoHS non-compliant, whereas all substitute parts listed (RS2M-13-F, S2M-E3/5BT, CFRB207-G, STTH208U) are ROHS3 compliant. For new designs and applications subject to RoHS requirements, ROHS3-compliant substitutes are necessary.

Q: Can I use a higher-rated diode (2 A) in place of a 1.5 A diode?

A: Yes, provided all other electrical parameters are compatible. A higher current rating provides design margin and does not degrade performance in applications requiring 1.5 A or less. The CFRB207-G (2 A) and STTH208U (2 A) are suitable from a current perspective. However, verify that voltage, recovery time, forward voltage, and temperature specifications remain compatible with the application.

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

A: Forward voltage determines the voltage drop across the diode during conduction and directly affects power dissipation and thermal performance. The RS2M-13 specifies 1.3 V @ 1.5 A. The S2M-E3/5BT offers lower forward voltage (1.15 V @ 1.5 A), reducing power loss. The STTH208U specifies higher forward voltage (1.65 V @ 2 A), increasing power dissipation. For thermal-sensitive applications, lower forward voltage is advantageous.

Q: Are all substitute parts available in the same SMB package?

A: Yes. All substitute parts listed (RS2M-13-F, S2M-E3/5BT, CFRB207-G, STTH208U) use the DO-214AA SMB package, ensuring mechanical and thermal compatibility with the RS2M-13. Printed circuit board layouts and thermal management designs require no modification.

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