Equivalent & Substitute Parts for Diodes Incorporated S2BF

Part Overview

The Diodes Incorporated S2BF is a general-purpose rectifier diode rated for 100 V DC reverse voltage and 1.5 A average rectified current in a surface mount SMB (DO-214AA) package. This component is classified as obsolete, necessitating identification of active equivalent parts for ongoing design requirements and procurement needs. Substitute parts must maintain functional compatibility while meeting current manufacturing and compliance standards.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	100	V
Current - Average Rectified (Io)	1.5	A
Voltage - Forward (Vf) (Max) @ If	1.15 @ 1.5 A	V
Speed	Standard Recovery >500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	5	µA @ 100 V
Capacitance @ Vr, F	20	pF @ 4V, 1MHz
Package / Case	DO-214AA, SMB	—
Operating Temperature - Junction	-65 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the obsolete S2BF is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Current rating: 1.5 A average rectified current (Io)
Package type: Surface mount SMB (DO-214AA)
Forward voltage: 1.15 V maximum at 1.5 A
Recovery speed: Standard recovery >500ns, > 200mA (Io)
Reverse leakage: 5 µA at rated voltage
Capacitance: 20 pF @ 4V, 1MHz
Operating temperature range: Minimum -55°C to maximum 150°C junction temperature
Compliance: ROHS3 and REACH standards

Voltage Rating Consideration: The S2BF operates at 100 V DC reverse voltage. Substitute parts may operate at equal or higher voltage ratings, provided all other electrical and mechanical parameters remain within specification. Higher voltage ratings do not compromise functionality in circuits designed for lower voltages.

Parameter Comparison

Parameter	S2BF (Main Part)	S2M_HF (Substitute)	Unit
Manufacturer	Diodes Incorporated	Diodes Incorporated	—
Category	Diodes, Rectifiers	Diodes, Rectifiers	—
Voltage - DC Reverse (Vr) (Max)	100	1000	V
Current - Average Rectified (Io)	1.5	1.5	A
Voltage - Forward (Vf) (Max) @ If	1.15 @ 1.5 A	1.15 @ 1.5 A	V
Speed	Standard Recovery >500ns, > 200mA (Io)	Standard Recovery >500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	5 @ 100 V	5 @ 1000 V	µA
Capacitance @ Vr, F	20 @ 4V, 1MHz	20 @ 4V, 1MHz	pF
Package / Case	DO-214AA, SMB	DO-214AA, SMB	—
Operating Temperature - Junction	-65 to 150	-55 to 150	°C
Product Status	Obsolete	Active	—
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	—
REACH Status	REACH Unaffected	REACH Unaffected	—

Engineering Selection Recommendations

The S2M_HF is a direct functional substitute for the obsolete S2BF. Both components are manufactured by Diodes Incorporated and share identical electrical characteristics for current rating, forward voltage, recovery speed, and capacitance. The S2M_HF maintains full compatibility with the SMB package footprint and mounting requirements.

The S2M_HF carries an active product status, ensuring ongoing availability and manufacturing support. Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for new designs and production.

The primary difference is the voltage rating: the S2M_HF is rated for 1000 V DC reverse voltage compared to the S2BF's 100 V rating. This higher voltage rating provides enhanced design margin and does not introduce incompatibility in circuits specified for 100 V operation. The operating temperature range of the S2M_HF (-55°C to 150°C) encompasses the critical upper temperature limit of the S2BF, with a narrower lower temperature specification that does not affect standard industrial applications.

Frequently Asked Questions (FAQ)

Q: Can the S2M_HF replace the S2BF in existing designs?

A: Yes. The S2M_HF maintains identical current rating (1.5 A), forward voltage (1.15 V @ 1.5 A), recovery speed, and package type (SMB DO-214AA). The higher voltage rating (1000 V vs. 100 V) does not create incompatibility in circuits designed for 100 V operation.

Q: What is the significance of the higher voltage rating on the S2M_HF?

A: The 1000 V rating on the S2M_HF provides increased reverse voltage withstand capability. In applications where the S2BF was rated for 100 V, the S2M_HF operates with additional design margin and does not degrade performance.

Q: Are the package dimensions identical between S2BF and S2M_HF?

A: Both components use the DO-214AA SMB surface mount package. Footprint compatibility is maintained for direct board-level substitution.

Q: What is the difference in operating temperature range?

A: The S2BF operates from -65°C to 150°C junction temperature, while the S2M_HF operates from -55°C to 150°C. The S2M_HF's lower temperature limit is -55°C, which covers standard industrial temperature ranges. Applications requiring operation below -55°C require evaluation against specific design requirements.

Q: Are both parts compliant with current regulatory standards?

A: Yes. Both the S2BF and S2M_HF are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: Why is the S2BF classified as obsolete?

A: The S2BF is no longer in active production. The S2M_HF represents the current active equivalent from Diodes Incorporated for this functional category.

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