RS1BFA Equivalent & Substitute Parts

Part Overview

The RS1BFA is a general-purpose fast recovery diode rated for 100V DC reverse voltage and 800mA average rectified current in a surface mount SOD-123FA package. Manufactured by onsemi, this component is classified as Not For New Designs, indicating it has been superseded in the manufacturer's product roadmap. Applications requiring equivalent functionality must identify substitute components that maintain electrical performance within the specified parameter ranges while accommodating packaging and availability constraints.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	100	V
Current - Average Rectified (Io)	800	mA
Voltage - Forward (Vf) (Max) @ If	1.3 @ 800 mA	V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	150	ns
Current - Reverse Leakage @ Vr	5	µA @ 100 V
Operating Temperature - Junction	-55 to 150	°C
Grade	Automotive	—
Qualification	AEC-Q101	—
Package / Case	SOD-123W	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the RS1BFA is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

Voltage - DC Reverse (Vr) rating must equal or exceed 100V
Current - Average Rectified (Io) rating must support 800mA operation
Speed classification must maintain Fast Recovery characteristics (≤ 500ns, > 200mA)
Reverse Recovery Time (trr) must not exceed 150ns
Operating temperature range must encompass -55°C to 150°C junction temperature

Mechanical and Compliance Criteria:

Surface mount technology required
Automotive grade classification (AEC-Q101 qualification)
RoHS3 compliance mandatory
Package form factor must be compatible with PCB layout constraints

The RS07B-GS18 substitute part meets the voltage and temperature specifications. However, the current rating of 500mA is lower than the RS1BFA's 800mA specification, requiring circuit-level evaluation to confirm suitability for the intended application.

Parameter Comparison

Parameter	RS1BFA (Main Part)	RS07B-GS18 (Substitute)	Unit
Manufacturer	onsemi	Vishay General Semiconductor - Diodes Division	—
Voltage - DC Reverse (Vr) (Max)	100	100	V
Current - Average Rectified (Io)	800	500	mA
Voltage - Forward (Vf) (Max) @ If	1.3 @ 800 mA	1.15 @ 700 mA	V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	150	150	ns
Current - Reverse Leakage @ Vr	5	10	µA @ 100 V
Capacitance @ Vr, F	10	9	pF @ 4V, 1MHz
Operating Temperature - Junction	-55 to 150	-55 to 150	°C
Grade	Automotive	Automotive	—
Qualification	AEC-Q101	AEC-Q101	—
Package / Case	SOD-123W	DO-219AB	—
Mounting Type	Surface Mount	Surface Mount	—
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	—
Product Status	Not For New Designs	Active	—

Engineering Selection Recommendations

RS07B-GS18 Substitution Assessment:

The RS07B-GS18 is an active product from Vishay General Semiconductor - Diodes Division and maintains compliance with automotive qualification standards (AEC-Q101) and RoHS3 requirements. Both components share identical voltage ratings (100V), reverse recovery time (150ns), and operating temperature range (-55°C to 150°C).

Critical Difference - Current Rating:

The RS07B-GS18 is rated for 500mA average rectified current, compared to the RS1BFA's 800mA rating. This 37.5% reduction in current capacity represents a significant electrical difference. Selection of the RS07B-GS18 is appropriate only when circuit design confirms that the maximum sustained forward current does not exceed 500mA under worst-case operating conditions.

Package Consideration:

The RS1BFA uses SOD-123W packaging, while the RS07B-GS18 uses DO-219AB (SMF) packaging. These are distinct surface mount form factors with different footprint geometries. PCB layout compatibility must be verified before substitution.

Compliance Status:

Both components satisfy automotive-grade requirements and RoHS3 compliance. The RS07B-GS18's active product status provides superior long-term availability compared to the RS1BFA's Not For New Designs classification.

Frequently Asked Questions (FAQ)

Q: Can the RS07B-GS18 directly replace the RS1BFA in all applications?

A: Direct replacement is limited by current rating. The RS07B-GS18 supports 500mA maximum average rectified current, while the RS1BFA supports 800mA. Substitution is valid only when circuit operation confirms sustained forward current remains below 500mA.

Q: Are the package footprints interchangeable?

A: No. The RS1BFA uses SOD-123W packaging and the RS07B-GS18 uses DO-219AB (SMF) packaging. These have different physical dimensions and PCB footprints. PCB redesign or adapter solutions may be required.

Q: Do both parts meet automotive qualification requirements?

A: Yes. Both the RS1BFA and RS07B-GS18 carry Automotive grade classification and AEC-Q101 qualification, meeting automotive industry standards.

Q: What is the significance of the RS1BFA's "Not For New Designs" status?

A: This designation indicates the manufacturer has discontinued active development and recommends against use in new product designs. The RS07B-GS18, classified as Active, represents the manufacturer's current product offering and provides superior long-term supply assurance.

Q: How do the reverse leakage currents compare?

A: The RS1BFA specifies 5µA reverse leakage at 100V, while the RS07B-GS18 specifies 10µA at 100V. The RS07B-GS18 exhibits twice the reverse leakage current. For applications sensitive to leakage current, this difference must be evaluated against circuit requirements.

Q: Are the forward voltage characteristics equivalent?

A: The specifications are provided at different test currents. The RS1BFA specifies 1.3V maximum at 800mA, while the RS07B-GS18 specifies 1.15V maximum at 700mA. Direct comparison at identical current levels is not possible from the provided data.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message