RS1MB-13 Equivalent & Substitute Parts

Part Overview

The RS1MB-13 is a general-purpose rectifier diode manufactured by Diodes Incorporated, rated for 1000 V DC reverse voltage and 1 A average rectified current in a Surface Mount SMB (DO-214AA) package. This device is classified as discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design requirements and production continuity. The part operates across a junction temperature range of -65°C to 150°C and features fast recovery characteristics with a reverse recovery time of 500 ns.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	1000	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 1 A	V
Reverse Recovery Time (trr)	500	ns
Current - Reverse Leakage @ Vr	5	µA @ 1000 V
Capacitance @ Vr, F	15	pF @ 4V, 1MHz
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-65°C ~ 150°C	°C
Technology	Standard	—

Substitute Part Grouping Explanation

Substitution of the RS1MB-13 is determined by electrical and mechanical compatibility within the following criteria:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Equal to or greater than 1000 V
Current - Average Rectified (Io): Equal to or greater than 1 A
Package / Case: DO-214AA, SMB (Surface Mount)
Mounting Type: Surface Mount

Secondary Compatibility Factors:

Reverse Recovery Time (trr): Fast recovery characteristics (≤ 500 ns preferred for equivalent performance)
Operating Temperature Range: Minimum -65°C to maximum 150°C or broader
RoHS Compliance: ROHS3 Compliant preferred for regulatory alignment

Substitute parts are grouped into two categories:

Category 1 - Parametric Equivalents: Parts meeting all primary criteria with identical or superior electrical specifications and active product status.

Category 2 - Functional Substitutes: Parts exceeding primary criteria in one or more parameters (higher voltage, current, or improved recovery characteristics) while maintaining package compatibility and surface mount configuration.

Parameter Comparison

Parameter	RS1MB-13	RS1MB-13-F	FR1M_R1_00001	S2MHE3_A/H	STTH208U
Manufacturer	Diodes Incorporated	Diodes Incorporated	Panjit International Inc.	Vishay General Semiconductor	STMicroelectronics
Voltage - DC Reverse (Vr) (Max)	1000 V	1000 V	1000 V	1000 V	800 V
Current - Average Rectified (Io)	1 A	1 A	1 A	1.5 A	2 A
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 1 A	1.3 V @ 1 A	1.3 V @ 1 A	1.15 V @ 1.5 A	1.65 V @ 2 A
Reverse Recovery Time (trr)	500 ns	500 ns	500 ns	2 µs	75 ns
Current - Reverse Leakage @ Vr	5 µA @ 1000 V	5 µA @ 1000 V	1 µA @ 1000 V	1 µA @ 1000 V	5 µA @ 800 V
Capacitance @ Vr, F	15 pF @ 4V, 1MHz	15 pF @ 4V, 1MHz	12 pF @ 4V, 1MHz	16 pF @ 4V, 1MHz	—
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature - Junction	-65°C ~ 150°C	-65°C ~ 150°C	-50°C ~ 150°C	-55°C ~ 150°C	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

RS1MB-13-F (Diodes Incorporated)

The RS1MB-13-F is a parametric equivalent manufactured by Diodes Incorporated with identical electrical specifications to the RS1MB-13. This part maintains 1000 V reverse voltage rating, 1 A average rectified current, and 500 ns reverse recovery time. The RS1MB-13-F is active in production status with ROHS3 compliance, addressing the regulatory gap of the discontinued original part. Packaging is available in Cut Tape and Digi-Reel formats with 24,248 units in stock. This substitute is the primary selection for direct replacement in existing designs.

FR1M_R1_00001 (Panjit International Inc.)

The FR1M_R1_00001 meets all primary electrical criteria with 1000 V reverse voltage and 1 A average rectified current in DO-214AA SMB package. This part demonstrates improved reverse leakage characteristics (1 µA versus 5 µA) and lower capacitance (12 pF versus 15 pF), resulting in superior high-frequency performance. Operating temperature range is -50°C to 150°C, which is narrower at the lower bound compared to the original part. ROHS3 compliance is confirmed. This substitute is suitable for applications where improved leakage and capacitance performance are beneficial.

S2MHE3_A/H (Vishay General Semiconductor - Diodes Division)

The S2MHE3_A/H exceeds primary current specifications at 1.5 A average rectified current while maintaining 1000 V reverse voltage rating. This part features automotive-grade qualification (AEC-Q101) and is suitable for applications requiring higher current capacity or automotive-level reliability. Reverse recovery time is 2 µs (standard recovery), which is slower than the original fast recovery specification. Operating temperature range is -55°C to 150°C. ROHS3 compliance is confirmed. This substitute is appropriate for designs requiring higher current margin or automotive qualification.

STTH208U (STMicroelectronics)

The STTH208U provides the highest current rating at 2 A average rectified current with superior fast recovery characteristics (75 ns reverse recovery time). However, the reverse voltage rating is 800 V, which is 200 V below the original specification. This part is not suitable for applications requiring the full 1000 V reverse voltage rating. ROHS3 compliance is confirmed. This substitute is applicable only in designs where the 800 V rating is sufficient and higher current capacity is required.

Frequently Asked Questions (FAQ)

Q: Can RS1MB-13-F be used as a direct replacement for RS1MB-13?

A: Yes. The RS1MB-13-F is a parametric equivalent with identical electrical specifications: 1000 V reverse voltage, 1 A average rectified current, 1.3 V forward voltage at 1 A, and 500 ns reverse recovery time. Both parts use the DO-214AA SMB package for surface mount applications. The primary difference is product status (RS1MB-13-F is active) and RoHS compliance (RS1MB-13-F is ROHS3 compliant).

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

A: Reverse recovery time (trr) defines the speed at which a diode transitions from conducting to blocking state. Fast recovery diodes have trr ≤ 500 ns, while standard recovery diodes have trr > 500 ns. The RS1MB-13 and its parametric equivalents (RS1MB-13-F, FR1M_R1_00001, STTH208U) feature fast recovery characteristics. The S2MHE3_A/H has standard recovery (2 µs), which may introduce higher switching losses in high-frequency applications.

Q: Can I use S2MHE3_A/H in place of RS1MB-13?

A: The S2MHE3_A/H is a functional substitute with higher current rating (1.5 A versus 1 A) and identical 1000 V reverse voltage. However, the reverse recovery time is 2 µs (standard recovery) compared to 500 ns (fast recovery) in the original part. This difference affects switching performance in high-frequency circuits. The S2MHE3_A/H is suitable for applications where the slower recovery time is acceptable and higher current capacity is beneficial.

Q: Why is STTH208U not recommended as a direct substitute?

A: The STTH208U has a maximum reverse voltage rating of 800 V, which is 200 V below the RS1MB-13 specification of 1000 V. Using this part in a circuit designed for 1000 V operation creates a reliability risk. The STTH208U is applicable only in designs where the operating voltage does not exceed 800 V and higher current capacity (2 A) is required.

Q: What is the significance of RoHS compliance for the RS1MB-13?

A: The original RS1MB-13 is RoHS non-compliant, which may restrict its use in applications subject to RoHS regulations. All substitute parts (RS1MB-13-F, FR1M_R1_00001, S2MHE3_A/H, STTH208U) are ROHS3 compliant, ensuring compatibility with regulatory requirements in electronics manufacturing and end-use applications.

Q: Are all substitute parts available in the same packaging format?

A: All substitute parts use the DO-214AA SMB package for surface mount applications. However, packaging formats differ: RS1MB-13-F is available in Cut Tape and Digi-Reel; FR1M_R1_00001 is available in Tape & Reel; S2MHE3_A/H is available in Tape & Reel; STTH208U is available in Cut Tape and Digi-Reel. Verify packaging availability with your supplier for production requirements.

Q: What is the operating temperature range difference between substitutes?

A: The RS1MB-13 operates from -65°C to 150°C. Substitute parts have the following ranges: RS1MB-13-F (-65°C to 150°C, identical), FR1M_R1_00001 (-50°C to 150°C, narrower at lower bound), S2MHE3_A/H (-55°C to 150°C, narrower at lower bound), STTH208U (maximum 175°C, no lower bound specified). Verify temperature range compatibility with your application requirements.

Q: How do reverse leakage current specifications compare?

A: Reverse leakage current at rated reverse voltage indicates diode quality and temperature stability. The RS1MB-13 specifies 5 µA at 1000 V. FR1M_R1_00001 and S2MHE3_A/H both specify 1 µA at 1000 V, indicating superior leakage performance. STTH208U specifies 5 µA at 800 V. Lower leakage current is beneficial for low-power applications and temperature stability.

Q: What does capacitance specification mean for diode selection?

A: Junction capacitance (measured at 4 V, 1 MHz) affects high-frequency performance and switching speed. The RS1MB-13 specifies 15 pF. FR1M_R1_00001 has lower capacitance at 12 pF, providing improved high-frequency response. S2MHE3_A/H has 16 pF. STTH208U does not specify capacitance. Lower capacitance is advantageous in RF and high-frequency switching applications.

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