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Equivalent & Substitute Parts for S3JB General Purpose Rectifier Diode
Part Overview
The onsemi S3JB is a general purpose rectifier diode rated for 600V DC reverse voltage and 3A average rectified current in a DO-214AA (SMB) surface mount package. This device is classified as "Not For New Designs" by the manufacturer, indicating it has reached end-of-life status. Finding equivalent and substitute parts is necessary for ongoing production support, maintenance applications, and design continuity where this component is already deployed in existing systems.
The S3JB operates across a junction temperature range of -55°C to 150°C and meets AEC-Q101 automotive qualification standards. It is RoHS3 compliant and carries MSL 1 (Unlimited) moisture sensitivity rating.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - DC Reverse (Vr) Maximum | 600 | V |
| Current - Average Rectified (Io) | 3 | A |
| Voltage - Forward (Vf) Maximum @ If | 1.15 @ 3 | V @ A |
| Reverse Recovery Time (trr) | 1.5 | µs |
| Current - Reverse Leakage @ Vr | 10 | µA @ 600V |
| Capacitance @ Vr, F | 18 | pF @ 0V, 1MHz |
| Operating Temperature - Junction | -55 to 150 | °C |
| Package / Case | DO-214AA, SMB | |
| Mounting Type | Surface Mount | |
| Technology | Standard | |
| RoHS Status | ROHS3 Compliant | |
| Moisture Sensitivity Level | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitute parts for the S3JB are grouped based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:
Critical Matching Parameters:
- Voltage - DC Reverse (Vr) Maximum: Must equal or exceed 600V
- Current - Average Rectified (Io): Must equal or exceed 3A
- Package / Case: Must be DO-214AA (SMB) surface mount
- Mounting Type: Must be Surface Mount
- Operating Temperature Range: Must accommodate the application's thermal requirements
Secondary Compatibility Parameters:
- Voltage - Forward (Vf) Maximum: Lower values indicate improved efficiency
- Reverse Recovery Time (trr): Affects switching characteristics in rectification circuits
- Current - Reverse Leakage: Lower values indicate better blocking characteristics
- RoHS and Compliance Status: Must maintain regulatory compliance
Substitutes are identified where all critical parameters are met or exceeded. Parts with lower current ratings (1A or 2A) are listed for reference but do not constitute direct substitutes for 3A applications.
Parameter Comparison
| Part Number | Manufacturer | Vr (Max) V | Io A | Vf (Max) @ If V | trr µs | Ir @ Vr µA | Package | Status | Temp Range °C |
|---|---|---|---|---|---|---|---|---|---|
| S3JB | onsemi | 600 | 3 | 1.15 @ 3A | 1.5 | 10 @ 600V | DO-214AA (SMB) | Not For New Designs | -55 to 150 |
| AS3BJ-M3/52T | Vishay General Semiconductor | 600 | 3 | 1.05 @ 3A | 1.5 | 20 @ 600V | DO-214AA (SMB) | Active | -55 to 175 |
| CMR3U-06M BK PBFREE | Central Semiconductor | 600 | 3 | 1.4 @ 3A | 0.1 | 5 @ 600V | DO-214AA (SMB) | Active | -65 to 175 |
| CMR3U-06M TR13 PBFREE | Central Semiconductor | 600 | 3 | 1.4 @ 3A | 0.1 | 5 @ 600V | DO-214AB (SMC) | Active | -65 to 175 |
Engineering Selection Recommendations
Direct Substitutes (3A Rating, DO-214AA Package):
The AS3BJ-M3/52T from Vishay General Semiconductor is the primary direct substitute. It matches the S3JB across all critical parameters: 600V reverse voltage, 3A average rectified current, and DO-214AA package. The AS3BJ-M3/52T is in Active product status, ensuring continued availability. It offers improved forward voltage (1.05V versus 1.15V) and an extended operating temperature range (-55°C to 175°C versus -55°C to 150°C). Both devices are RoHS3 compliant with MSL 1 rating.
The CMR3U-06M BK PBFREE from Central Semiconductor meets all critical electrical parameters for 3A operation at 600V in DO-214AA package. This part is Active status and offers extended temperature range (-65°C to 175°C). It features faster recovery characteristics (100ns versus 1.5µs) and lower reverse leakage (5µA versus 10µA), making it suitable for applications requiring improved switching performance.
Package Consideration:
The CMR3U-06M TR13 PBFREE is electrically identical to the CMR3U-06M BK variant but uses DO-214AB (SMC) package instead of DO-214AA (SMB). This part is not a direct mechanical substitute due to package difference and should only be selected if the PCB layout accommodates SMC footprint.
Compliance and Availability:
All recommended substitutes maintain RoHS3 compliance and REACH unaffected status, matching the regulatory profile of the original S3JB. Inventory availability varies: AS3BJ-M3/52T (4,400 units), CMR3U-06M BK PBFREE (733 units), and CMR3U-06M TR13 PBFREE (5,854 units).
Frequently Asked Questions (FAQ)
Q: Can I use a 2A rated diode as a substitute for the S3JB 3A diode?
A: No. The S3JB is rated for 3A average rectified current. Substituting a 2A rated device (such as CMR2-06 or CMR2U-06 variants) would exceed the component's current rating and create reliability risk. Current rating must equal or exceed the application requirement.
Q: What is the difference between the AS3BJ-M3/52T and CMR3U-06M?
A: Both are 600V, 3A DO-214AA devices in Active status. The AS3BJ-M3/52T has standard recovery characteristics (1.5µs) matching the S3JB, while CMR3U-06M has fast recovery (100ns). The AS3BJ-M3/52T offers lower forward voltage (1.05V) for improved efficiency. CMR3U-06M provides lower reverse leakage (5µA) and extended temperature range. Selection depends on circuit requirements for recovery speed and thermal performance.
Q: Why is the S3JB marked "Not For New Designs"?
A: This status indicates the part has reached end-of-life and the manufacturer is not recommending it for new product development. Existing inventory remains available for support of fielded products. For new designs, select from Active status alternatives such as AS3BJ-M3/52T or CMR3U-06M variants.
Q: Are all substitutes RoHS3 compliant?
A: Yes. All recommended 3A substitutes (AS3BJ-M3/52T, CMR3U-06M variants) are RoHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the compliance profile of the original S3JB.
Q: What is the difference between CMR3U-06M BK PBFREE and CMR3U-06M TR13 PBFREE?
A: These parts are electrically identical but differ in packaging format and case style. The BK variant uses Bulk packaging with DO-214AA (SMB) case. The TR13 variant uses Tape & Reel packaging with DO-214AB (SMC) case. The SMC package is physically larger than SMB. Select based on your PCB footprint requirements and packaging preference.
Q: Can I substitute the S3JB with a 1A rated diode?
A: No. Parts rated for 1A (CMR1-06 variants) have insufficient current capacity for applications requiring 3A. Current rating is a critical parameter that cannot be reduced without compromising circuit performance and component reliability.
Q: What does "Fast Recovery" mean compared to "Standard Recovery"?
A: Recovery time refers to how quickly the diode transitions from conducting to blocking state. Fast recovery (≤500ns) is beneficial in high-frequency switching applications, while standard recovery (>500ns) is suitable for line-frequency rectification. The S3JB uses standard recovery (1.5µs). CMR3U-06M variants offer fast recovery (100ns) for improved performance in switching circuits.
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