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SMBJ85A-M3/5B Equivalent & Substitute Parts
Part Overview
The SMBJ85A-M3/5B is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates in the 85V reverse standoff voltage class and is designed for general-purpose transient voltage suppression applications. The part is Active status and ROHS3 compliant. Equivalent and substitute parts are identified based on matching electrical characteristics and mechanical compatibility within the DO-214AA (SMB) package family.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | SMBJ85A-M3/5B |
| Manufacturer | Vishay General Semiconductor - Diodes Division |
| Category | Transient Voltage Suppressors (TVS) |
| Type | Zener |
| Unidirectional Channels | 1 |
| Voltage - Reverse Standoff (Typ) | 85V |
| Voltage - Breakdown (Min) | 94.4V |
| Voltage - Clamping (Max) @ Ipp | 137V |
| Current - Peak Pulse (10/1000µs) | 4.4A |
| Power - Peak Pulse | 600W |
| Operating Temperature Range | -55°C ~ 150°C (TJ) |
| Mounting Type | Surface Mount |
| Package / Case | DO-214AA, SMB |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitute parts for the SMBJ85A-M3/5B are grouped into two categories based on electrical and mechanical compatibility:
Category 1: Direct Electrical Equivalents (85V Class) Parts that maintain identical or equivalent electrical specifications within the 85V reverse standoff voltage class. These parts share the same voltage ratings, clamping characteristics, and peak pulse current ratings, ensuring drop-in compatibility in circuit applications.
Key matching parameters:
- Voltage - Reverse Standoff (Typ): 85V
- Voltage - Breakdown (Min): 94.4V
- Voltage - Clamping (Max) @ Ipp: 137V
- Current - Peak Pulse (10/1000µs): 4.4A (±0.2A tolerance acceptable)
- Power - Peak Pulse: 600W
- Package / Case: DO-214AA, SMB
- Mounting Type: Surface Mount
Category 2: Voltage Class Alternatives (78V and 90V Classes) Parts that operate in adjacent voltage classes (78V and 90V) with different clamping voltages and peak pulse currents. These are suitable for applications where the exact 85V specification is not critical and the alternative voltage class meets circuit protection requirements.
Parameter Comparison
| Part Number | Manufacturer | Voltage - Reverse Standoff (Typ) | Voltage - Breakdown (Min) | Voltage - Clamping (Max) @ Ipp | Current - Peak Pulse (10/1000µs) | Power - Peak Pulse | Operating Temperature | Package | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|
| SMBJ85A-M3/5B | Vishay | 85V | 94.4V | 137V | 4.4A | 600W | -55°C ~ 150°C | DO-214AA, SMB | ROHS3 |
| SMBJ85A-E3/52 | Vishay | 85V | 94.4V | 137V | 4.4A | 600W | -55°C ~ 150°C | DO-214AA, SMB | ROHS3 |
| SMBJ85A-E3/5B | Vishay | 85V | 94.4V | 137V | 4.4A | 600W | -55°C ~ 150°C | DO-214AA, SMB | ROHS3 |
| SMBJ85A | Meritek | 85V | 94.4V | 137V | 4.38A | 600W | -55°C ~ 150°C | DO-214AA, SMB | ROHS3 |
| SMBJ85A-13-F | Diodes Incorporated | 85V | 94.4V | 137V | 4.4A | 600W | -55°C ~ 150°C | DO-214AA, SMB | ROHS3 |
| SMBJ85A-HR | Littelfuse Inc. | 85V | 94.4V | 137V | 4.4A | 600W | -65°C ~ 150°C | DO-214AA, SMB | ROHS3 |
| SMBJ78A | MDD | 78V | 86.7V | 126V | 4.8A | 600W | -50°C ~ 150°C | DO-214AA, SMB | ROHS3 |
| SMBJ90A | MDD | 90V | 100V | 146V | 4.1A | 600W | -50°C ~ 150°C | DO-214AA, SMB | ROHS3 |
Engineering Selection Recommendations
Direct Equivalents (Category 1): SMBJ85A-E3/52, SMBJ85A-E3/5B, SMBJ85A-13-F, and SMBJ85A-HR are direct electrical equivalents suitable for drop-in replacement. All maintain the 85V reverse standoff voltage class with identical clamping voltage (137V) and peak pulse current (4.4A). All parts are ROHS3 compliant and carry Active product status. SMBJ85A-HR offers extended lower temperature operation (-65°C minimum) compared to the main part (-55°C minimum). The Meritek SMBJ85A variant shows 4.38A peak pulse current, within acceptable tolerance of the 4.4A specification.
Voltage Class Alternatives (Category 2): SMBJ78A and SMBJ90A operate in different voltage classes and are suitable only when circuit design permits deviation from the 85V specification. SMBJ78A operates at 78V reverse standoff with 126V clamping voltage and 4.8A peak pulse current. SMBJ90A operates at 90V reverse standoff with 146V clamping voltage and 4.1A peak pulse current. Both alternatives maintain 600W peak pulse power and ROHS3 compliance. Temperature operating ranges differ: SMBJ78A and SMBJ90A operate from -50°C minimum, compared to -55°C for the main part.
Frequently Asked Questions (FAQ)
Q: Can SMBJ85A-E3/52 and SMBJ85A-E3/5B be used interchangeably with SMBJ85A-M3/5B? A: Yes. Both parts are manufactured by Vishay and maintain identical electrical specifications: 85V reverse standoff, 137V clamping voltage, 4.4A peak pulse current, and 600W peak pulse power. All three parts use the DO-214AA (SMB) package and are ROHS3 compliant. The suffix variations (M3/5B, E3/52, E3/5B) indicate different packaging or tape configurations but do not affect electrical performance.
Q: What is the difference between SMBJ85A from Meritek and the Vishay SMBJ85A-M3/5B? A: The Meritek SMBJ85A maintains the same voltage ratings (85V reverse standoff, 137V clamping) and package (DO-214AA, SMB). The peak pulse current specification is 4.38A compared to 4.4A for the Vishay part, representing a 0.02A difference within normal manufacturing tolerance. Both are ROHS3 compliant and suitable for equivalent applications.
Q: Can SMBJ85A-HR from Littelfuse replace SMBJ85A-M3/5B? A: Yes. SMBJ85A-HR is electrically equivalent with identical voltage and current ratings. The primary difference is the extended lower operating temperature range: -65°C to 150°C compared to -55°C to 150°C for the main part. This makes SMBJ85A-HR suitable for applications requiring operation at lower temperatures.
Q: When should SMBJ78A or SMBJ90A be used instead of SMBJ85A-M3/5B? A: SMBJ78A and SMBJ90A are voltage class alternatives, not direct equivalents. SMBJ78A (78V class) is suitable when lower voltage suppression is acceptable. SMBJ90A (90V class) is suitable when higher voltage suppression is required. These alternatives should only be selected when circuit design permits deviation from the 85V specification and the alternative voltage class meets protection requirements.
Q: Are all substitute parts available in the same packaging format? A: All substitute parts in Category 1 (direct equivalents) use the DO-214AA (SMB) surface mount package, matching the main part. SMBJ78A and SMBJ90A also use DO-214AA (SMB) packaging. Tape & Reel (TR) packaging availability varies by manufacturer and part number variant.
Q: What compliance certifications apply to all substitute parts? A: All listed substitute parts are ROHS3 compliant, REACH unaffected, and carry ECCN EAR99 classification. Moisture Sensitivity Level (MSL) is 1 (Unlimited) for all parts. All parts maintain Active product status.
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