S1BFL General Purpose Rectifier Diode Equivalent & Substitute Parts

Part Overview

The S1BFL is a general purpose rectifier diode manufactured by onsemi, rated for 100 V DC reverse voltage and 1 A average rectified current in a surface mount SOD-123F package. This device is classified as "Not For New Designs," indicating it has been superseded in onsemi's product portfolio. Identifying equivalent and substitute parts is necessary for applications requiring continued sourcing, design updates, or component availability optimization.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	100	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.1	V @ 1 A
Reverse Recovery Time (trr)	2	µs
Current - Reverse Leakage @ Vr	1	µA @ 100 V
Capacitance @ Vr, F	4	pF @ 4V, 1MHz
Package / Case	SOD-123F	-
Operating Temperature - Junction	-50 to 150	°C
RoHS Status	ROHS3 Compliant	-
Moisture Sensitivity Level (MSL)	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitute parts for the S1BFL are classified into two categories based on electrical and mechanical compatibility:

Parametric Equivalents (Direct Substitutes): Parts that match all critical electrical parameters—100 V reverse voltage, 1 A average rectified current, 1.1 V forward voltage drop at 1 A, standard recovery speed, and SOD-123F package form factor. These parts are interchangeable in applications where the S1BFL was originally specified.

Similar Substitutes (Functional Alternatives): Parts that meet the core voltage and current requirements but differ in one or more secondary parameters such as package type, recovery time, or forward voltage characteristics. These require circuit-level evaluation to confirm suitability.

The following parameters determine substitution eligibility:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 100 V
Current - Average Rectified (Io): Must equal or exceed 1 A
Voltage - Forward (Vf) (Max) @ If: Must not exceed 1.1 V @ 1 A
Package / Case: SOD-123F preferred; alternative packages acceptable if board layout permits
Operating Temperature Range: Must encompass -50°C to 150°C or be compatible with application requirements
RoHS and MSL Compliance: Must maintain ROHS3 compliance and MSL 1 rating

Parameter Comparison

Parameter	S1BFL (onsemi)	SL1B (Diotec)	GS1001FL_R1_00001 (Panjit)	CEFM102-G (Comchip)	S1FLB-GS08 (Vishay)
Voltage - DC Reverse (Vr) (Max)	100 V	100 V	100 V	100 V	100 V
Current - Average Rectified (Io)	1 A	1 A	1 A	1 A	700 mA
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 1 A	1.1 V @ 1 A	1.1 V @ 1 A	875 mV @ 1 A	1.1 V @ 1 A
Speed	Standard Recovery >500ns, > 200mA (Io)	Standard Recovery >500ns, > 200mA (Io)	Standard Recovery >500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Standard Recovery >500ns, > 200mA (Io)
Reverse Recovery Time (trr)	2 µs	1 µs	Not specified	25 ns	1.8 µs
Current - Reverse Leakage @ Vr	1 µA @ 100 V	1 µA @ 100 V	1 µA @ 100 V	5 µA @ 100 V	10 µA @ 100 V
Capacitance @ Vr, F	4 pF @ 4V, 1MHz	Not specified	4 pF @ 4V, 1MHz	15 pF @ 4V, 1MHz	4 pF @ 4V, 1MHz
Package / Case	SOD-123F	SOD-123F	SOD-123F	SOD-123T	DO-219AB
Operating Temperature - Junction	-50 to 150°C	-50 to 150°C	-50 to 150°C	-55 to 150°C	-55 to 150°C
Product Status	Not For New Designs	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	Not Applicable	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Tier 1 - Direct Parametric Equivalents (Preferred for Existing Designs)

SL1B (Diotec Semiconductor) and GS1001FL_R1_00001 (Panjit International Inc.) are parametric equivalents to the S1BFL. Both devices match the 100 V reverse voltage, 1 A current rating, 1.1 V forward voltage drop, standard recovery speed, and SOD-123F package. Both manufacturers maintain active product status and ROHS3 compliance. SL1B offers a shorter reverse recovery time of 1 µs compared to the S1BFL's 2 µs, providing improved switching performance. GS1001FL_R1_00001 maintains identical electrical characteristics and is available in higher inventory quantities (12,453 units). These parts are suitable for direct substitution in applications where the S1BFL was originally specified.

Tier 2 - Functional Alternatives with Package Compatibility

CEFM102-G (Comchip Technology) meets the 100 V and 1 A requirements with superior forward voltage performance (875 mV @ 1 A versus 1.1 V). This device features fast recovery characteristics (≤ 500 ns, 25 ns trr) compared to the S1BFL's standard recovery. The package is SOD-123T, which is mechanically compatible with SOD-123F footprints. CEFM102-G is suitable for applications where reduced forward voltage drop and faster switching are beneficial. Extended operating temperature range (-55°C to 150°C) provides additional margin.

Tier 3 - Current-Limited Alternative

S1FLB-GS08 (Vishay General Semiconductor) is rated for 700 mA average rectified current, below the S1BFL's 1 A specification. This device is suitable only for applications where the actual circuit current requirement does not exceed 700 mA. The DO-219AB package differs from SOD-123F and requires board layout verification. This part is not recommended as a direct replacement for 1 A applications.

Compliance and Availability Considerations

All substitute parts maintain ROHS3 compliance and MSL 1 rating, ensuring compatibility with standard manufacturing and storage requirements. SL1B and GS1001FL_R1_00001 are available in active product status, supporting long-term sourcing. The S1BFL's "Not For New Designs" status necessitates migration to active alternatives for new product development.

Frequently Asked Questions (FAQ)

Q: Can SL1B or GS1001FL_R1_00001 be used as direct replacements for S1BFL in existing applications?

A: Yes. Both SL1B and GS1001FL_R1_00001 are parametric equivalents matching the S1BFL's 100 V reverse voltage, 1 A current rating, 1.1 V forward voltage drop, and SOD-123F package. Both are active products with ROHS3 compliance. No circuit modifications are required.

Q: What is the difference between the S1BFL and CEFM102-G?

A: The primary differences are forward voltage (875 mV for CEFM102-G versus 1.1 V for S1BFL) and recovery speed (fast recovery ≤ 500 ns for CEFM102-G versus standard recovery >500 ns for S1BFL). The CEFM102-G package is SOD-123T rather than SOD-123F, though both are mechanically compatible. CEFM102-G is suitable for applications benefiting from lower forward voltage drop and faster switching.

Q: Why is S1FLB-GS08 listed as a substitute if it has a lower current rating?

A: S1FLB-GS08 is listed as a functional alternative for applications where the actual circuit current does not exceed 700 mA. It is not suitable for applications requiring the full 1 A rating. The DO-219AB package also differs from SOD-123F, requiring board layout verification.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed—SL1B, GS1001FL_R1_00001, CEFM102-G, and S1FLB-GS08—are ROHS3 compliant, matching the S1BFL's compliance status.

Q: What does "Not For New Designs" mean for the S1BFL?

A: This designation indicates that onsemi has superseded the S1BFL in its product portfolio. While existing inventory remains available, the part is not recommended for new product development. SL1B and GS1001FL_R1_00001 are active alternatives suitable for new designs.

Q: Can CEFM102-G be used in high-temperature applications?

A: CEFM102-G operates from -55°C to 150°C, providing a 5°C lower temperature margin compared to the S1BFL's -50°C to 150°C range. For applications operating at or near -55°C, CEFM102-G offers additional margin. Both parts are suitable for standard industrial temperature ranges.

Q: What is the significance of the reverse recovery time difference between S1BFL (2 µs) and SL1B (1 µs)?

A: The shorter reverse recovery time in SL1B (1 µs) indicates faster switching behavior, reducing switching losses and improving efficiency in high-frequency applications. For standard rectification applications, both values are acceptable. The choice depends on circuit switching frequency requirements.

Q: Are there inventory considerations when selecting a substitute?

A: Yes. GS1001FL_R1_00001 has the highest inventory (12,453 units), followed by S1BFL (15,720 units), S1FLB-GS08 (3,200 units), SL1B (3,599 units), and CEFM102-G (912 units). For high-volume applications, GS1001FL_R1_00001 offers superior availability.

Q: Do all substitute parts have the same moisture sensitivity level?

A: SL1B is listed as "Not Applicable" for MSL, while S1BFL, GS1001FL_R1_00001, CEFM102-G, and S1FLB-GS08 all have MSL 1 (Unlimited). This difference does not affect standard manufacturing or storage practices for either classification.

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