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SMBJ85A-M3/52 Equivalent & Substitute Parts
Part Overview
The SMBJ85A-M3/52 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 performance parameters and mechanical compatibility within the DO-214AA (SMB) package family.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | SMBJ85A-M3/52 |
| 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 |
| Package / Case | DO-214AA, SMB |
| Mounting Type | Surface Mount |
| Operating Temperature | -55°C ~ 150°C (TJ) |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
| Product Status | Active |
Substitute Part Grouping Explanation
Substitute parts for the SMBJ85A-M3/52 are classified into two categories based on electrical parameter matching:
Category 1: Direct Electrical Equivalents (85V Class) Parts that maintain identical or equivalent electrical specifications across all critical parameters: Voltage - Reverse Standoff (Typ) of 85V, Voltage - Breakdown (Min) of 94.4V, Voltage - Clamping (Max) @ Ipp of 137V, Current - Peak Pulse of 4.4A, and Power - Peak Pulse of 600W. These parts are interchangeable in applications requiring the 85V suppression class.
Category 2: Manufacturer-Recommended Alternatives (Adjacent Voltage Classes) Parts from the same SMBJ series operating in adjacent voltage classes (78V and 90V). These are designated as manufacturer-recommended alternatives and may be selected when circuit design parameters permit operation outside the primary 85V class specification.
Parameter Comparison
| Part Number | Manufacturer | Voltage - Reverse Standoff (Typ) | Voltage - Breakdown (Min) | Voltage - Clamping (Max) @ Ipp | Current - Peak Pulse (10/1000µs) | Power - Peak Pulse | Package / Case | Operating Temperature | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|
| SMBJ85A-M3/52 | Vishay General Semiconductor - Diodes Division | 85V | 94.4V | 137V | 4.4A | 600W | DO-214AA, SMB | -55°C ~ 150°C (TJ) | ROHS3 Compliant |
| SMBJ85A-E3/52 | Vishay General Semiconductor - Diodes Division | 85V | 94.4V | 137V | 4.4A | 600W | DO-214AA, SMB | -55°C ~ 150°C (TJ) | ROHS3 Compliant |
| SMBJ85A-13-F | Diodes Incorporated | 85V | 94.4V | 137V | 4.4A | 600W | DO-214AA, SMB | -55°C ~ 150°C (TJ) | ROHS3 Compliant |
| SMBJ85A-HR | Littelfuse Inc. | 85V | 94.4V | 137V | 4.4A | 600W | DO-214AA, SMB | -65°C ~ 150°C (TJ) | ROHS3 Compliant |
| SMBJ85A | Meritek | 85V | 94.4V | 137V | 4.38A | 600W | DO-214AA, SMB | -55°C ~ 150°C | ROHS3 Compliant |
| SMBJ78A | MDD | 78V | 86.7V | 126V | 4.8A | 600W | DO-214AA, SMB | -50°C ~ 150°C (TJ) | ROHS3 Compliant |
| SMBJ90A | MDD | 90V | 100V | 146V | 4.1A | 600W | DO-214AA, SMB | -50°C ~ 150°C (TJ) | ROHS3 Compliant |
Engineering Selection Recommendations
Direct Equivalents (85V Class - Preferred Selection)
SMBJ85A-E3/52 (Vishay General Semiconductor - Diodes Division) is the manufacturer-recommended equivalent with identical electrical specifications and packaging. This part maintains full compatibility with the original SMBJ85A-M3/52 specification.
SMBJ85A-13-F (Diodes Incorporated) provides equivalent electrical performance with identical voltage and current ratings. This part is suitable for direct substitution in applications requiring the 85V suppression class.
SMBJ85A-HR (Littelfuse Inc.) offers equivalent electrical specifications with an extended lower operating temperature range (-65°C vs. -55°C). This part is suitable for applications requiring enhanced low-temperature performance.
SMBJ85A (Meritek) provides equivalent electrical performance with a marginal current specification variance (4.38A vs. 4.4A). This part is suitable for applications where the minor current difference is acceptable.
Manufacturer-Recommended Alternatives (Adjacent Voltage Classes)
SMBJ78A (MDD) operates in the 78V reverse standoff voltage class with 126V clamping voltage. This part is designated as a manufacturer-recommended alternative for applications where lower voltage suppression is acceptable.
SMBJ90A (MDD) operates in the 90V reverse standoff voltage class with 146V clamping voltage. This part is designated as a manufacturer-recommended alternative for applications where higher voltage suppression is required.
All substitute parts maintain ROHS3 compliance, MSL 1 rating, and surface mount DO-214AA (SMB) package compatibility.
Frequently Asked Questions (FAQ)
Q: Can SMBJ85A-E3/52 be used as a direct replacement for SMBJ85A-M3/52?
A: Yes. SMBJ85A-E3/52 is the manufacturer-recommended equivalent with identical electrical specifications: 85V reverse standoff, 137V clamping voltage, 4.4A peak pulse current, and 600W peak pulse power. Both parts use the DO-214AA (SMB) package and are ROHS3 compliant.
Q: What is the difference between SMBJ85A-M3/52 and SMBJ85A-HR?
A: Both parts maintain identical electrical specifications (85V standoff, 137V clamping, 4.4A peak pulse current). The primary difference is the operating temperature range: SMBJ85A-M3/52 operates from -55°C to 150°C, while SMBJ85A-HR extends to -65°C. SMBJ85A-HR is suitable for applications requiring enhanced low-temperature performance.
Q: Can SMBJ78A or SMBJ90A be used instead of SMBJ85A-M3/52?
A: SMBJ78A and SMBJ90A are manufacturer-recommended alternatives operating in adjacent voltage classes. SMBJ78A (78V standoff, 126V clamping) provides lower voltage suppression, while SMBJ90A (90V standoff, 146V clamping) provides higher voltage suppression. Selection depends on circuit design requirements and whether operation outside the 85V class is acceptable.
Q: Are all substitute parts compatible with the DO-214AA (SMB) package footprint?
A: Yes. All listed substitute parts use the DO-214AA (SMB) surface mount package and are mechanically compatible with the original SMBJ85A-M3/52 footprint.
Q: What compliance certifications apply to all substitute parts?
A: All substitute parts are ROHS3 compliant, REACH unaffected, and carry MSL 1 (Unlimited) moisture sensitivity rating. All parts are classified under ECCN EAR99 and HTSUS 8541.10.0080.
Q: How does the Meritek SMBJ85A differ from other 85V equivalents?
A: The Meritek SMBJ85A maintains the 85V reverse standoff and 137V clamping specifications. The peak pulse current specification is 4.38A compared to 4.4A in other equivalents. This minor variance (0.02A) is within typical manufacturing tolerance and does not affect functional compatibility in general-purpose transient suppression applications.
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