S3B General Purpose Rectifier Diode 100V 3A SMC Equivalent & Substitute Parts

Part Overview

The onsemi S3B is a general purpose rectifier diode rated for 100V DC reverse voltage and 3A average rectified current in a surface mount SMC (DO-214AB) package. This component is classified as Last Time Buy, indicating that the original manufacturer has discontinued new production. Identifying equivalent and substitute parts is necessary to maintain design continuity and ensure component availability for ongoing production and repair applications.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	100	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 3 A	V
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the S3B rectifier diode is determined by the following critical parameters:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 100V
Current - Average Rectified (Io): 3A
Package / Case: DO-214AB, SMC
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

Allowable Variation Parameters:

Voltage - Forward (Vf) (Max): Substitute parts may vary within the range of 900 mV to 1.3V at rated current
Speed (Recovery Characteristics): Both Standard Recovery (>500ns) and Fast Recovery (≤500ns) types are acceptable
Reverse Recovery Time (trr): Variation permitted based on speed classification
Current - Reverse Leakage @ Vr: Acceptable range 5 µA to 10 µA @ 100V
Operating Temperature - Junction: Extended range acceptable (-65°C to 175°C)
Packaging Format: Cut Tape (CT), Digi-Reel®, or Tape & Reel (TR) formats are interchangeable

Substitute parts must maintain electrical equivalence in voltage and current ratings while accommodating minor variations in forward voltage drop and recovery characteristics that do not degrade circuit performance.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) [V]	Speed	Trr [ns/µs]	Ir @ Vr [µA]	Tj (°C)	Product Status	Packaging
S3B	onsemi	100	3	1.2 @ 3A	Standard >500ns	2.5 µs	5 @ 100V	-55 to 150	Last Time Buy	CT & Digi-Reel®
S3B-TP	Micro Commercial Co	100	3	1.2 @ 3A	Standard >500ns	—	10 @ 100V	-55 to 150	Not For New Designs	TR
ES3B-13-F	Diodes Incorporated	100	3	0.9 @ 3A	Fast ≤500ns	25 ns	10 @ 100V	-55 to 150	Active	TR
ES3B-E3/57T	Vishay General Semiconductor	100	3	0.9 @ 3A	Fast ≤500ns	30 ns	10 @ 100V	-55 to 150	Active	CT
ES3B-E3/9AT	Vishay General Semiconductor	100	3	0.9 @ 3A	Fast ≤500ns	30 ns	10 @ 100V	-55 to 150	Active	TR
ESH3B-E3/57T	Vishay General Semiconductor	100	3	0.9 @ 3A	Fast ≤500ns	40 ns	5 @ 100V	-55 to 175	Active	TR
ESH3B-E3/9AT	Vishay General Semiconductor	100	3	0.9 @ 3A	Fast ≤500ns	40 ns	5 @ 100V	-55 to 175	Active	TR
RS3B-13-F	Diodes Incorporated	100	3	1.3 @ 3A	Fast ≤500ns	150 ns	5 @ 100V	-65 to 150	Active	TR
S3B-13-F	Diodes Incorporated	100	3	1.15 @ 3A	Standard >500ns	—	10 @ 100V	-65 to 150	Active	CT & Digi-Reel®
S3B-E3/57T	Vishay General Semiconductor	100	3	1.15 @ 2.5A	Standard >500ns	2.5 µs	10 @ 100V	-55 to 150	Active	TR
S3B-M3/9AT	Vishay General Semiconductor	100	3	1.15 @ 2.5A	Standard >500ns	2.5 µs	10 @ 100V	-55 to 150	Active	TR

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

The following parts are recommended as direct substitutes based on active product status and full parameter alignment:

S3B-13-F (Diodes Incorporated): Active status, identical voltage and current ratings, standard recovery characteristics matching the original S3B, available in Cut Tape and Digi-Reel® packaging formats. Extended operating temperature range to -65°C provides additional margin.
S3B-E3/57T and S3B-M3/9AT (Vishay General Semiconductor): Active status, standard recovery characteristics, identical voltage and current ratings. Both maintain the 2.5 µs reverse recovery time specification of the original part. Available in Tape & Reel format.

Secondary Substitutes (Fast Recovery Variants):

The following parts provide equivalent electrical performance with improved switching characteristics:

ES3B-13-F and ES3B-E3/57T (Diodes Incorporated and Vishay): Fast recovery rectifiers with reduced forward voltage (0.9V vs. 1.2V), resulting in lower power dissipation. Reverse recovery time reduced to 25-30 ns. Active product status ensures long-term availability.
ES3B-E3/9AT (Vishay General Semiconductor): Fast recovery variant with identical electrical performance to ES3B-13-F, available in Tape & Reel packaging.

Extended Temperature Substitutes:

ESH3B-E3/57T and ESH3B-E3/9AT (Vishay General Semiconductor): Extended junction temperature range to 175°C with fast recovery characteristics. Reverse leakage current reduced to 5 µA. Suitable for applications requiring elevated temperature operation.

Alternative Substitute (Limited Recommendation):

RS3B-13-F (Diodes Incorporated): Active status with extended operating temperature to -65°C. Forward voltage specification of 1.3V is at the upper limit of acceptable variation. Reverse recovery time of 150 ns represents slower switching compared to other fast recovery options.

Not Recommended for New Designs:

S3B-TP (Micro Commercial Co): Classified as "Not For New Designs," indicating manufacturer discontinuation trajectory. While electrically compatible, this part should not be selected for new circuit designs.

All recommended substitutes maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with existing manufacturing and storage processes.

Frequently Asked Questions (FAQ)

Q: Can I substitute the onsemi S3B with any of the listed alternatives without circuit modification?

A: Yes. All listed substitute parts maintain the same 100V reverse voltage rating and 3A average rectified current specification. The DO-214AB (SMC) package is identical across all parts. However, variations in forward voltage drop (0.9V to 1.3V) and recovery characteristics may affect circuit performance in applications sensitive to switching speed or power dissipation. Circuit analysis is required to confirm suitability for specific applications.

Q: What is the difference between Standard Recovery and Fast Recovery rectifiers?

A: Standard Recovery rectifiers (S3B, S3B-13-F, S3B-E3/57T, S3B-M3/9AT) have reverse recovery times exceeding 500 nanoseconds, typically in the 2.5 microsecond range. Fast Recovery rectifiers (ES3B series, ESH3B series) have reverse recovery times of 25-40 nanoseconds. Fast recovery types reduce switching losses and electromagnetic interference in high-frequency applications but may not be necessary for low-frequency rectification circuits.

Q: Are the different packaging formats (Cut Tape, Digi-Reel®, Tape & Reel) electrically equivalent?

A: Yes. Cut Tape (CT), Digi-Reel®, and Tape & Reel (TR) are packaging and delivery formats only. They do not affect the electrical characteristics of the diode itself. Selection between formats depends on assembly equipment compatibility and inventory management requirements.

Q: Why do some substitute parts have lower forward voltage specifications?

A: Forward voltage variation is a normal characteristic of semiconductor manufacturing. The ES3B and ESH3B series specify 0.9V forward voltage compared to the S3B specification of 1.2V. Lower forward voltage results in reduced power dissipation during conduction. This is an allowable variation that improves circuit efficiency without compromising functionality.

Q: Can I use the ESH3B series parts with extended temperature range (-55°C to 175°C) in place of the standard S3B?

A: Yes. The ESH3B series maintains all electrical specifications required for S3B substitution while providing extended upper temperature rating to 175°C. This represents an enhancement rather than a compromise. Selection depends on whether the application requires this extended temperature capability.

Q: What is the significance of the "Last Time Buy" status for the onsemi S3B?

A: Last Time Buy status indicates that onsemi has announced discontinuation of this part number. Existing inventory may be available for a limited period, but long-term supply cannot be guaranteed. Transition to an active substitute part is necessary for designs requiring ongoing component availability beyond the Last Time Buy window.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed in this reference maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the original S3B specifications. This ensures compatibility with existing manufacturing processes and environmental regulations.

Q: How do I determine which substitute is best for my specific application?

A: Selection criteria depend on circuit requirements: (1) For standard rectification with minimal switching frequency requirements, use S3B-13-F or S3B-E3/57T for closest electrical match. (2) For applications requiring reduced power dissipation, select ES3B-13-F or ES3B-E3/57T. (3) For elevated temperature environments, select ESH3B-E3/57T or ESH3B-E3/9AT. (4) Verify forward voltage drop and reverse recovery time compatibility with circuit design specifications.

Q: Is reverse leakage current variation significant between substitute parts?

A: Reverse leakage current ranges from 5 µA to 10 µA across substitute parts. This variation is typically insignificant in most rectification applications. Selection based on leakage current is necessary only in high-impedance circuits or applications with stringent leakage specifications.

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