S1MB-13 Equivalent & Substitute Parts

Part Overview

The S1MB-13 is a general-purpose rectifier diode rated for 1000 V DC reverse voltage and 1 A average rectified current in a Surface Mount SMB (DO-214AA) package. Manufactured by Diodes Incorporated, this component is classified as discontinued at DiGi Electronics, necessitating identification of equivalent and substitute parts for ongoing design requirements and production continuity.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	1000 V
Current - Average Rectified (Io)	1 A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 1 A
Reverse Recovery Time (trr)	3 µs
Current - Reverse Leakage @ Vr	5 µA @ 1000 V
Mounting Type	Surface Mount
Package / Case	DO-214AA, SMB
Operating Temperature - Junction	-65°C ~ 150°C
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the S1MB-13 is determined by the following critical parameters:

Electrical Compatibility Requirements:

Voltage - DC Reverse (Vr) rating must equal or exceed 1000 V
Current - Average Rectified (Io) rating must equal or exceed 1 A
Forward voltage drop must not exceed application limits
Reverse leakage current must remain within acceptable bounds

Mechanical Compatibility Requirements:

Mounting type must be Surface Mount
Package footprint must be compatible with DO-214AA (SMB) or equivalent land pattern

Environmental Requirements:

Operating temperature range must encompass application requirements
Moisture sensitivity level must be acceptable for assembly processes

Substitute parts are grouped into two categories: Parametric Equivalents (identical electrical and mechanical specifications) and Functional Alternatives (meeting or exceeding electrical requirements with potential package or performance variations).

Parameter Comparison

Parameter	S1MB-13 (Main)	S1MB-13-F	S1M	S1MB	STTH208U	UF1M-TP
Manufacturer	Diodes Incorporated	Diodes Incorporated	EVVO Semi	Taiwan Semiconductor Corporation	STMicroelectronics	Micro Commercial Co
Voltage - DC Reverse (Vr) (Max)	1000 V	1000 V	1000 V	1000 V	800 V	1000 V
Current - Average Rectified (Io)	1 A	1 A	1 A	1 A	2 A	1 A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 1 A	1.1 V @ 1 A	1.1 V @ 1 A	1.1 V @ 1 A	1.65 V @ 2 A	Not specified
Reverse Recovery Time (trr)	3 µs	3 µs	Not specified	Not specified	75 ns	100 ns
Current - Reverse Leakage @ Vr	5 µA @ 1000 V	5 µA @ 1000 V	5 µA @ 1 kV	5 µA @ 1000 V	5 µA @ 800 V	10 µA @ 1000 V
Capacitance @ Vr, F	10 pF @ 4V, 1MHz	10 pF @ 4V, 1MHz	15 pF @ 4V, 1MHz	12 pF @ 4V, 1MHz	Not specified	17 pF @ 4V, 1MHz
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AC, SMA	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Operating Temperature - Junction	-65°C ~ 150°C	-65°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C	Up to 175°C	-50°C ~ 150°C
Product Status	Discontinued at DiGi Electronics	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Inventory Status	775 Pcs	30200 Pcs	5394 Pcs	16450 Pcs	20300 Pcs	1415 Pcs

Engineering Selection Recommendations

Parametric Equivalent - Recommended Primary Substitute:

S1MB-13-F (Diodes Incorporated) is the direct parametric equivalent to the S1MB-13. This part maintains identical electrical specifications (1000 V, 1 A, 1.1 V forward voltage, 3 µs recovery time) and mechanical compatibility (DO-214AA SMB package). The S1MB-13-F is ROHS3 compliant and carries active product status with substantial inventory availability (30,200 units). This part is suitable for direct replacement in all applications where the S1MB-13 was originally specified.

Functional Alternatives - Package-Compatible Substitutes:

S1MB (Taiwan Semiconductor Corporation) provides electrical equivalence with identical voltage, current, and forward voltage ratings in the same DO-214AA SMB package. Operating temperature range is -55°C to 150°C. ROHS3 compliance and active status support long-term availability. Capacitance specification (12 pF) is within acceptable variance.

UF1M-TP (Micro Commercial Co) meets all electrical requirements (1000 V, 1 A) in the DO-214AA SMB package with ROHS3 compliance and active status. This part features faster recovery time (100 ns versus 3 µs), which may provide performance benefits in switching applications. Reverse leakage current is specified at 10 µA, representing a minor increase from the 5 µA baseline.

Functional Alternative - Package Variation:

S1M (EVVO Semi) provides electrical equivalence in a different package format (DO-214AC SMA versus DO-214AA SMB). This substitution requires PCB layout modification and is suitable only when package footprint change is acceptable. Operating temperature range is -55°C to 150°C.

Not Recommended for Direct Substitution:

STTH208U (STMicroelectronics) does not meet the voltage requirement specification. With a maximum reverse voltage rating of 800 V, this part is unsuitable for applications requiring 1000 V operation. Although current rating (2 A) and package format (SMB) are compatible, the voltage deficiency precludes use as a substitute.

Frequently Asked Questions (FAQ)

Q: Can S1MB-13-F be used as a direct replacement for S1MB-13?

A: Yes. S1MB-13-F is a parametric equivalent with identical electrical specifications (1000 V, 1 A, 1.1 V forward voltage) and mechanical compatibility (DO-214AA SMB package). The primary difference is product status (active versus discontinued) and RoHS compliance (ROHS3 versus non-compliant).

Q: What is the difference between S1MB-13 and S1M?

A: Both parts share identical electrical ratings (1000 V, 1 A, 1.1 V forward voltage). The primary difference is package format: S1MB-13 uses DO-214AA (SMB), while S1M uses DO-214AC (SMA). SMA packages are physically smaller and require different PCB land patterns. Substitution requires PCB redesign.

Q: Why is STTH208U not suitable as a substitute?

A: STTH208U has a maximum reverse voltage rating of 800 V, which does not meet the 1000 V requirement of the S1MB-13. Although this part offers higher current capacity (2 A) and faster recovery time (75 ns), the voltage deficiency makes it unsuitable for applications requiring 1000 V operation.

Q: What are the advantages of UF1M-TP over S1MB-13?

A: UF1M-TP maintains full electrical equivalence (1000 V, 1 A) while offering significantly faster recovery time (100 ns versus 3 µs). This faster recovery characteristic may reduce switching losses and improve efficiency in high-frequency applications. Both parts use the DO-214AA SMB package.

Q: Are all substitute parts RoHS compliant?

A: All substitute parts listed (S1MB-13-F, S1M, S1MB, STTH208U, UF1M-TP) are ROHS3 compliant. The original S1MB-13 is RoHS non-compliant. For applications requiring RoHS compliance, any of the listed substitutes are acceptable from a regulatory standpoint.

Q: What is the operating temperature range consideration for substitution?

A: The S1MB-13 operates from -65°C to 150°C. Substitute parts operate within narrower ranges: S1MB-13-F (-65°C to 150°C), S1M (-55°C to 150°C), S1MB (-55°C to 150°C), STTH208U (up to 175°C), and UF1M-TP (-50°C to 150°C). For applications requiring operation below -55°C, only S1MB-13-F maintains the full temperature range of the original part.

Q: Can S1MB be used interchangeably with S1MB-13?

A: Yes, for most applications. S1MB provides identical electrical specifications and uses the same DO-214AA SMB package. The operating temperature range is slightly narrower (-55°C to 150°C versus -65°C to 150°C). Capacitance specification differs slightly (12 pF versus 10 pF), which is typically insignificant in rectifier applications.

Q: What inventory considerations should guide part selection?

A: S1MB-13-F offers the highest inventory availability (30,200 units), followed by STTH208U (20,300 units) and S1MB (16,450 units). UF1M-TP has limited availability (1,415 units). For long-term production requirements, S1MB-13-F is the preferred choice based on supply continuity.

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