S3MB-HF General Purpose Rectifier Diode Equivalent & Substitute Parts

Part Overview

The S3MB-HF is an active general purpose rectifier diode manufactured by Comchip Technology, rated for 1000 V DC reverse voltage and 3 A average rectified current in a surface mount SMB/DO-214AA package. This component is designed for standard recovery applications requiring reliable rectification in compact form factors. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are maintained across the same package standard, enabling procurement flexibility and supply chain continuity.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	1000	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1.1 @ 3 A	V
Speed	Standard Recovery >500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	5	µA @ 1000 V
Capacitance @ Vr, F	35	pF @ 4V, 1MHz
Package / Case	DO-214AA, SMB	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the S3MB-HF are identified based on strict equivalence of the following critical parameters:

Voltage Rating: DC reverse voltage of 1000 V maximum
Current Rating: Average rectified current of 3 A
Forward Voltage: Maximum 1.1 V at 3 A forward current
Recovery Characteristics: Standard recovery with >500 ns recovery time at >200 mA
Package Standard: DO-214AA/SMB surface mount package
Operating Temperature Range: -55°C to 150°C junction temperature
Compliance: ROHS3 compliance and MSL 1 rating

The S3MA_R1_00001 manufactured by Panjit International Inc. meets all these criteria and is therefore classified as a parametric equivalent substitute. Both parts maintain identical electrical performance specifications and mechanical compatibility within the SMB/DO-214AA package footprint.

Parameter Comparison

Parameter	S3MB-HF (Comchip)	S3MA_R1_00001 (Panjit)	Match Status
Voltage - DC Reverse (Vr) (Max)	1000 V	1000 V	Equivalent
Current - Average Rectified (Io)	3 A	3 A	Equivalent
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 3 A	1.1 V @ 3 A	Equivalent
Speed	Standard Recovery >500ns, > 200mA (Io)	Standard Recovery >500ns, > 200mA (Io)	Equivalent
Current - Reverse Leakage @ Vr	5 µA @ 1000 V	1 µA @ 1000 V	Compatible (Lower leakage)
Capacitance @ Vr, F	35 pF @ 4V, 1MHz	35 pF @ 4V, 1MHz	Equivalent
Package / Case	DO-214AA, SMB	DO-214AA, SMB	Equivalent
Operating Temperature - Junction	-55°C to 150°C	-55°C to 150°C	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Equivalent

Engineering Selection Recommendations

Both the S3MB-HF and S3MA_R1_00001 are active products with ROHS3 compliance and MSL 1 rating, confirming suitability for standard manufacturing and storage conditions without moisture sensitivity constraints. The S3MA_R1_00001 exhibits lower reverse leakage current (1 µA versus 5 µA at 1000 V), which represents an improvement in leakage performance while maintaining all other electrical and mechanical specifications. Selection between these parts may be based on availability, lead time, or procurement requirements, as both satisfy the complete electrical and mechanical requirements for 1000 V, 3 A general purpose rectification applications in SMB/DO-214AA packages.

Frequently Asked Questions (FAQ)

Q: Can the S3MA_R1_00001 be used as a direct replacement for the S3MB-HF in existing designs?

A: Yes. Both parts share identical voltage ratings (1000 V), current ratings (3 A), forward voltage characteristics (1.1 V @ 3 A), recovery speed (standard >500 ns), package type (DO-214AA/SMB), and operating temperature range (-55°C to 150°C). The S3MA_R1_00001 exhibits lower reverse leakage current, which is compatible with applications designed for the S3MB-HF.

Q: Are there any package or footprint differences between these parts?

A: No. Both parts use the DO-214AA/SMB surface mount package standard, ensuring identical PCB footprint, land pattern, and mounting compatibility.

Q: What is the significance of the lower reverse leakage current in the S3MA_R1_00001?

A: The S3MA_R1_00001 specifies 1 µA reverse leakage at 1000 V compared to 5 µA for the S3MB-HF. Lower reverse leakage reduces standby current consumption and heat generation in applications where the diode is reverse-biased, representing improved performance within the same electrical class.

Q: Do both parts meet the same compliance and environmental standards?

A: Yes. Both the S3MB-HF and S3MA_R1_00001 are ROHS3 compliant and rated MSL 1 (Unlimited), indicating no moisture sensitivity constraints and compliance with current environmental regulations.

Q: What recovery speed classification applies to these diodes?

A: Both parts are classified as standard recovery diodes with recovery time exceeding 500 nanoseconds at forward currents greater than 200 mA. This classification is appropriate for general purpose rectification applications where fast recovery is not required.

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