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SMBJ8.5 Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts
Part Overview
The SMBJ8.5 is a unidirectional Zener transient voltage suppressor diode manufactured by Littelfuse Inc. in the DO-214AA (SMB) surface mount package. This component is designed for general-purpose transient voltage suppression applications with an 8.5V reverse standoff voltage and 600W peak pulse power rating. The SMBJ8.5 is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | SMBJ8.5 |
| Manufacturer | Littelfuse Inc. |
| Category | Transient Voltage Suppressors (TVS) |
| Type | Zener |
| Unidirectional Channels | 1 |
| Voltage - Reverse Standoff (Typ) | 8.5V |
| Voltage - Breakdown (Min) | 8.93V |
| Voltage - Clamping (Max) @ Ipp | 15.12V |
| Current - Peak Pulse (10/1000µs) | 41.7A |
| Power - Peak Pulse | 600W |
| Operating Temperature Range | -65°C ~ 150°C (TJ) |
| Package / Case | DO-214AA, SMB |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitution of the SMBJ8.5 is determined by the following critical parameters:
- Reverse standoff voltage: 8.5V (±tolerance)
- Unidirectional Zener diode topology with single channel
- Surface mount package: DO-214AA (SMB)
- Peak pulse power rating: 600W
- Operating temperature range compatibility
- RoHS3 compliance and MSL rating
Substitute parts must maintain the same reverse standoff voltage class (8.5V nominal) and support the same or greater peak pulse current and power dissipation. Package compatibility (DO-214AA/SMB) is mandatory for direct board-level replacement. All listed substitutes are active products with current manufacturing status, providing long-term availability compared to the obsolete SMBJ8.5.
Parameter Comparison
| Part Number | Manufacturer | Voltage - Reverse Standoff (Typ) | Voltage - Clamping (Max) @ Ipp | Current - Peak Pulse (10/1000µs) | Operating Temperature | Package | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|
| SMBJ8.5 | Littelfuse Inc. | 8.5V | 15.12V | 41.7A | -65°C ~ 150°C | DO-214AA (SMB) | Obsolete | ROHS3 Compliant |
| SMBJ8.5A | Taiwan Semiconductor Corporation | 8.5V | 14.4V | 43A | -55°C ~ 150°C | DO-214AA (SMB) | Active | ROHS3 Compliant |
| SM6T10A | STMicroelectronics | 8.55V | 18.6V | 215A (8/20µs) | -55°C ~ 150°C | DO-214AA (SMB) | Active | ROHS3 Compliant |
| SM6T10A-E3/52 | Vishay General Semiconductor - Diodes Division | 8.55V | 14.5V | 41A | -65°C ~ 150°C | DO-214AA (SMB) | Active | ROHS3 Compliant |
| SM6T10AY | STMicroelectronics | 8.55V | 18.6V | 215A (8/20µs) | -55°C ~ 150°C | DO-214AA (SMB) | Active | ROHS3 Compliant |
| SMBJ8.5A-13-F | Diodes Incorporated | 8.5V | 14.4V | 41.7A | -55°C ~ 150°C | DO-214AA (SMB) | Active | ROHS3 Compliant |
| SMBJ8.5A-E3/52 | Vishay General Semiconductor - Diodes Division | 8.5V | 14.4V | 41.7A | -55°C ~ 150°C | DO-214AA (SMB) | Active | ROHS3 Compliant |
| SMBJ8.5A-E3/5B | Vishay General Semiconductor - Diodes Division | 8.5V | 14.4V | 41.7A | -55°C ~ 150°C | DO-214AA (SMB) | Active | ROHS3 Compliant |
| SMBJ8E3/TR13 | Microchip Technology | 8.5V | 15.9V | 37.7A | -65°C ~ 150°C | DO-214AA (SMB) | Active | ROHS3 Compliant |
| SMBJ8V5A | Fairchild Semiconductor | 8.5V | 14.4V | 41.7A | -55°C ~ 150°C | DO-214AA (SMB) | Active | ROHS3 Compliant |
Engineering Selection Recommendations
All substitute parts listed are active products with current manufacturing status, providing superior long-term availability compared to the obsolete SMBJ8.5. Selection among substitutes should be based on the following criteria:
Direct Electrical Equivalents: SMBJ8.5A, SMBJ8.5A-13-F, SMBJ8.5A-E3/52, SMBJ8.5A-E3/5B, and SMBJ8V5A maintain the 8.5V reverse standoff voltage and 41.7A peak pulse current specification. These parts are functionally interchangeable with the original SMBJ8.5 for general-purpose transient suppression applications.
Extended Temperature Range: SMBJ8E3/TR13 and SM6T10A-E3/52 support the full -65°C to 150°C operating temperature range matching the original SMBJ8.5, providing compatibility for applications requiring extended low-temperature operation.
Higher Peak Pulse Current: SM6T10A and SM6T10AY offer 215A peak pulse current (8/20µs), providing enhanced transient suppression capability for high-energy surge environments. These parts maintain 8.55V reverse standoff voltage within the 8.5V class tolerance.
Automotive Grade: SM6T10AY carries AEC-Q101 automotive qualification, suitable for automotive and harsh environment applications requiring formal qualification documentation.
All substitute parts maintain ROHS3 compliance and MSL 1 rating, ensuring compatibility with standard surface mount assembly processes and long-term storage without moisture sensitivity concerns.
Frequently Asked Questions (FAQ)
Q: Can SMBJ8.5A directly replace SMBJ8.5 in existing designs?
A: Yes. SMBJ8.5A maintains the same 8.5V reverse standoff voltage, 600W peak pulse power rating, and DO-214AA (SMB) package. The primary difference is product status (active vs. obsolete) and slightly lower operating temperature minimum (-55°C vs. -65°C). For applications operating above -55°C, SMBJ8.5A is a direct functional equivalent.
Q: What is the difference between SM6T10A and SMBJ8.5A?
A: Both maintain 8.5V-class reverse standoff voltage and DO-214AA (SMB) packaging. SM6T10A offers significantly higher peak pulse current (215A vs. 43A) and higher clamping voltage (18.6V vs. 14.4V). SM6T10A is suitable for applications requiring greater transient energy absorption. SMBJ8.5A is appropriate for standard general-purpose suppression with lower surge energy requirements.
Q: Are all substitute parts available in the same package?
A: Yes. All listed substitutes use the DO-214AA (SMB) surface mount package, enabling direct board-level replacement without PCB redesign or assembly process changes.
Q: Which substitute part has the widest operating temperature range?
A: SMBJ8E3/TR13 and SM6T10A-E3/52 both support -65°C to 150°C, matching the original SMBJ8.5 temperature range. Other substitutes operate from -55°C to 150°C, which is acceptable for most commercial and industrial applications.
Q: Is RoHS compliance maintained across all substitutes?
A: Yes. All substitute parts listed are ROHS3 compliant, maintaining environmental and regulatory compliance equivalent to the original SMBJ8.5.
Q: What is the difference between SMBJ8.5A-E3/52 and SMBJ8.5A-E3/5B?
A: Both parts are manufactured by Vishay and maintain identical electrical specifications (8.5V reverse standoff, 14.4V clamping, 41.7A peak pulse current). The suffix designations indicate different packaging or tape reel configurations. Selection between these variants depends on procurement and assembly requirements.
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