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SMBJ8.5C Transient Voltage Suppressor Diode – Equivalent & Substitute Parts
Part Overview
The SMBJ8.5C is a bidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. The device features an 8.5V reverse standoff voltage with a 15.12V maximum clamping voltage at peak pulse current. The SMBJ8.5C is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Reverse Standoff Voltage (Typ) | 8.5 | V |
| Breakdown Voltage (Min) | 8.93 | V |
| Clamping Voltage (Max) @ Ipp | 15.12 | V |
| Peak Pulse Current (10/1000µs) | 41.7 | A |
| Peak Pulse Power | 600 | W |
| Operating Temperature Range | -65 to 150 | °C (TJ) |
| Package Type | DO-214AA (SMB) | — |
| Mounting Type | Surface Mount | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitution of the SMBJ8.5C is determined by the following critical parameters:
- Reverse Standoff Voltage: Must remain at 8.5V (±tolerance) to maintain circuit protection threshold
- Clamping Voltage: Maximum allowable clamping voltage at peak pulse current; lower values provide tighter voltage regulation
- Peak Pulse Current: Must support minimum 41.7A to ensure adequate transient suppression capability
- Peak Pulse Power: Must support 600W dissipation rating
- Package Type: DO-214AA (SMB) surface-mount package for PCB compatibility
- Operating Temperature Range: Must support -65°C to 150°C junction temperature
- RoHS Compliance: ROHS3 compliance required for regulatory alignment
Substitute parts are grouped into two categories:
Category 1 – Direct Electrical Equivalents (Identical Standoff & Clamping Voltage)
- SMBJ8.5CA (EVVO Semi): 8.5V standoff, 14.4V clamping voltage
Category 2 – Functional Equivalents (Matched Standoff Voltage, Comparable Clamping Performance)
- P6SMB10CA series (Vishay): 8.55V standoff, 14.5V clamping voltage
- SM6T10CA series (STMicroelectronics & Vishay): 8.55V standoff, 14.5V to 18.6V clamping voltage
Parameter Comparison
| Part Number | Manufacturer | Standoff Voltage (V) | Breakdown Min (V) | Clamping Voltage (V) | Peak Pulse Current (A) | Peak Pulse Power (W) | Package | Status |
|---|---|---|---|---|---|---|---|---|
| SMBJ8.5C | Littelfuse Inc. | 8.5 | 8.93 | 15.12 | 41.7 | 600 | DO-214AA (SMB) | Obsolete |
| SMBJ8.5CA | EVVO Semi | 8.5 | 9.44 | 14.4 | 41.7 | 600 | DO-214AA (SMB) | Active |
| P6SMB10CA-E3/52 | Vishay General Semiconductor | 8.55 | 9.5 | 14.5 | 41.4 | 600 | DO-214AA (SMB) | Active |
| P6SMB10CA-M3/52 | Vishay General Semiconductor | 8.55 | 9.5 | 14.5 | 41.4 | 600 | DO-214AA (SMB) | Active |
| P6SMB10CA-M3/5B | Vishay General Semiconductor | 8.55 | 9.5 | 14.5 | 41.4 | 600 | DO-214AA (SMB) | Active |
| SM6T10CA | STMicroelectronics | 8.55 | 9.5 | 18.6 | 215 (8/20µs) | 600 | DO-214AA (SMB) | Active |
| SM6T10CA-E3/52 | Vishay General Semiconductor | 8.55 | 9.5 | 14.5 | 41 | 600 | DO-214AA (SMB) | Active |
| SM6T10CA-E3/5B | Vishay General Semiconductor | 8.55 | 9.5 | 14.5 | 41 | 600 | DO-214AA (SMB) | Active |
| SM6T10CAY | STMicroelectronics | 8.55 | 9.5 | 18.6 | 215 (8/20µs) | 600 | DO-214AA (SMB) | Active |
Engineering Selection Recommendations
Primary Substitute: SMBJ8.5CA (EVVO Semi)
The SMBJ8.5CA provides the closest electrical match to the SMBJ8.5C with identical 8.5V standoff voltage and comparable 14.4V clamping voltage. Both devices support 41.7A peak pulse current and 600W peak pulse power within the same DO-214AA package. The SMBJ8.5CA is active in production with ROHS3 compliance and MSL 1 rating, ensuring long-term availability and regulatory alignment.
Secondary Substitutes: P6SMB10CA Series (Vishay)
The P6SMB10CA series (variants E3/52, M3/52, M3/5B) offers functional equivalence with a marginal 0.05V increase in standoff voltage (8.55V) and comparable 14.5V clamping voltage. Peak pulse current is 41.4A, within 0.3A of the original specification. These devices are active with ROHS3 compliance and REACH unaffected status. Packaging variants accommodate different procurement requirements: Tape & Reel (TR) for E3 variants and Tape & Box (TB) for M3 variants.
Alternative Substitutes: SM6T10CA Series (STMicroelectronics & Vishay)
The SM6T10CA and SM6T10CAY (STMicroelectronics) provide higher peak pulse current capability (215A at 8/20µs) with 18.6V clamping voltage, suitable for applications requiring enhanced transient suppression margin. The SM6T10CAY variant includes AEC-Q101 automotive qualification. Vishay's SM6T10CA-E3 variants maintain 14.5V clamping voltage with 41A peak pulse current, offering a middle-ground option. All SM6T series devices are active with ROHS3 compliance.
Frequently Asked Questions (FAQ)
Q: Can SMBJ8.5CA directly replace SMBJ8.5C without circuit modification?
A: Yes. The SMBJ8.5CA maintains identical 8.5V standoff voltage and comparable 14.4V clamping voltage with matching 41.7A peak pulse current and 600W power rating. Both use DO-214AA package. No circuit modification is required.
Q: What is the difference between P6SMB10CA and SM6T10CA variants?
A: The P6SMB10CA series maintains 14.5V clamping voltage with 41.4A peak pulse current, closely matching the original SMBJ8.5C performance. The SM6T10CA series offers higher peak pulse current (215A at 8/20µs) with 18.6V clamping voltage, providing greater transient suppression capability at the cost of higher clamping voltage. Selection depends on circuit protection requirements.
Q: Are packaging variants (E3/52, M3/52, M3/5B) electrically equivalent?
A: Yes. The electrical specifications are identical across all P6SMB10CA and SM6T10CA packaging variants. Differences are limited to packaging format: E3/52 and E3/5B use Tape & Reel (TR), while M3/52 and M3/5B use Tape & Box (TB). Selection is based on procurement and assembly requirements.
Q: Does the 0.05V difference in standoff voltage (8.5V vs 8.55V) affect circuit protection?
A: The 0.05V difference is within typical tolerance ranges for TVS diodes and does not materially affect circuit protection performance. Both voltage levels maintain the same protection threshold for 8.5V nominal circuits.
Q: Are all substitute parts RoHS3 compliant?
A: Yes. All listed substitute parts carry ROHS3 compliance certification, meeting regulatory requirements for hazardous substance restrictions.
Q: Which substitute is recommended for automotive applications?
A: The SM6T10CAY (STMicroelectronics) includes AEC-Q101 automotive qualification, making it suitable for automotive-grade applications requiring formal qualification documentation.
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