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SMBJ8.5HE3/5B Equivalent & Substitute Parts
Part Overview
The SMBJ8.5HE3/5B is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, designed for surface mount applications in the DO-214AA (SMB) package. This component operates with an 8.5V reverse standoff voltage and provides 15.9V maximum clamping voltage at peak pulse current, delivering 600W peak pulse power dissipation. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for new designs and production continuity.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Manufacturer Part Number | SMBJ8.5HE3/5B | — |
| Manufacturer | Vishay General Semiconductor - Diodes Division | — |
| Category | Transient Voltage Suppressors (TVS) | — |
| Package / Case | DO-214AA, SMB | — |
| Type | Zener | — |
| Unidirectional Channels | 1 | — |
| Voltage - Reverse Standoff (Typ) | 8.5 | V |
| Voltage - Breakdown (Min) | 9.44 | V |
| Voltage - Clamping (Max) @ Ipp | 15.9 | V |
| Current - Peak Pulse (10/1000µs) | 37.7 | A |
| Power - Peak Pulse | 600 | W |
| Operating Temperature Range | -55 to 150 | °C (TJ) |
| Mounting Type | Surface Mount | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | — |
| Product Status | Obsolete | — |
| Grade | Automotive | — |
| Qualification | AEC-Q101 | — |
Substitute Part Grouping Explanation
Substitution of the SMBJ8.5HE3/5B is determined by strict alignment of the following electrical and mechanical parameters:
Critical Substitution Parameters:
- Reverse Standoff Voltage (Typ): 8.5V ± tolerance
- Voltage - Clamping (Max) @ Ipp: 15.9V or lower (protective margin)
- Current - Peak Pulse (10/1000µs): 37.7A or higher
- Power - Peak Pulse: 600W
- Package / Case: DO-214AA, SMB (surface mount compatibility)
- Unidirectional Channels: 1
- Mounting Type: Surface Mount
Acceptable Variation Ranges: Substitute parts must maintain reverse standoff voltage within the 8.5V specification band. Clamping voltage may be lower (improved protection) but not exceed 15.9V. Peak pulse current must meet or exceed 37.7A to ensure adequate transient suppression capability. All substitutes must be housed in DO-214AA (SMB) surface mount package to ensure PCB footprint compatibility.
Active vs. Obsolete Status: The original part is obsolete. All listed substitutes are active products from established manufacturers, ensuring long-term availability and supply chain continuity.
Parameter Comparison
| Parameter | SMBJ8.5HE3/5B (Main) | SMBJ8.5E3/TR13 | P6SMB10A | SM6T10A | SM6T10AY | SMBJ8.5A | SMBJ8.5A-13-F | SMBJ8.5AE3/TR13 |
|---|---|---|---|---|---|---|---|---|
| Manufacturer | Vishay | Microchip | Eaton | STMicroelectronics | STMicroelectronics | Taiwan Semiconductor | Diodes Inc. | Microchip |
| Product Status | Obsolete | Active | Active | Active | Active | Active | Active | Active |
| Voltage - Reverse Standoff (Typ) | 8.5V | 8.5V | 8.55V | 8.55V | 8.55V | 8.5V | 8.5V | 8.5V |
| Voltage - Breakdown (Min) | 9.44V | 9.44V | 9.5V | 9.5V | 9.5V | 9.44V | 9.44V | 9.44V |
| Voltage - Clamping (Max) @ Ipp | 15.9V | 15.9V | 14.5V | 18.6V | 18.6V | 14.4V | 14.4V | 14.4V |
| Current - Peak Pulse (10/1000µs) | 37.7A | 37.7A | 42.1A | 215A (8/20µs) | 215A (8/20µs) | 43A | 41.7A | 41.7A |
| Power - Peak Pulse | 600W | 600W | 600W | 600W | 600W | 600W | 600W | 600W |
| Operating Temperature Range | -55 to 150°C | -65 to 150°C | -55 to 150°C | -55 to 150°C | -55 to 150°C | -55 to 150°C | -55 to 150°C | -65 to 150°C |
| Package / Case | DO-214AA, SMB | DO-214AA, SMB | DO-214AA, SMB | DO-214AA, SMB | DO-214AA, SMB | DO-214AA, SMB | DO-214AA, SMB | DO-214AA, SMB |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | RoHS Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
| Grade | Automotive | — | — | — | Automotive | — | — | — |
| Qualification | AEC-Q101 | — | — | — | AEC-Q101 | — | — | — |
Engineering Selection Recommendations
Primary Substitutes (Highest Compatibility):
SMBJ8.5E3/TR13 (Microchip Technology) and SMBJ8.5AE3/TR13 (Microchip Technology) provide direct electrical equivalence with identical reverse standoff voltage (8.5V) and clamping voltage (15.9V and 14.4V respectively). Both are active products with ROHS3 compliance and unlimited moisture sensitivity rating. SMBJ8.5E3/TR13 extends operating temperature to -65°C, offering enhanced low-temperature performance. Both are packaged in tape and reel format suitable for automated assembly.
SMBJ8.5A (Taiwan Semiconductor Corporation) and SMBJ8.5A-13-F (Diodes Incorporated) maintain the 8.5V reverse standoff specification with slightly lower clamping voltage (14.4V), providing enhanced transient suppression margin. Both are active products with ROHS3 compliance and high inventory availability.
Secondary Substitutes (Acceptable with Application Review):
P6SMB10A (Eaton - Electronics Division) operates at 8.55V reverse standoff with 14.5V clamping voltage and 42.1A peak pulse current. This part is active and ROHS compliant, suitable for applications where the slightly elevated standoff voltage is acceptable.
SM6T10A and SM6T10AY (STMicroelectronics) operate at 8.55V reverse standoff with 18.6V clamping voltage and significantly higher peak pulse current (215A at 8/20µs). SM6T10AY carries automotive grade and AEC-Q101 qualification, matching the original part's automotive credentials. These parts are active and ROHS3 compliant. The elevated clamping voltage requires circuit-level evaluation to confirm compatibility with downstream components.
Compliance and Certification:
All substitute parts maintain ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1), ensuring environmental and manufacturing process compatibility. SM6T10AY uniquely carries automotive grade and AEC-Q101 qualification, directly matching the original part's automotive specification for applications requiring automotive-grade components.
Frequently Asked Questions (FAQ)
Q: Can SMBJ8.5E3/TR13 directly replace SMBJ8.5HE3/5B?
A: Yes. Both parts share identical reverse standoff voltage (8.5V) and clamping voltage (15.9V), with matching peak pulse current (37.7A) and power dissipation (600W). SMBJ8.5E3/TR13 is active and ROHS3 compliant. The extended operating temperature range (-65 to 150°C vs. -55 to 150°C) provides additional margin for low-temperature applications.
Q: What is the difference between SMBJ8.5A and SMBJ8.5AE3/TR13?
A: Both maintain 8.5V reverse standoff voltage and are ROHS3 compliant. SMBJ8.5AE3/TR13 (Microchip) offers extended operating temperature (-65 to 150°C) and tape & reel packaging for automated assembly. SMBJ8.5A (Taiwan Semiconductor) provides equivalent electrical performance with standard -55 to 150°C operating range. Selection depends on temperature requirements and assembly process.
Q: Why do SM6T10A and SM6T10AY have higher clamping voltage (18.6V)?
A: SM6T10A and SM6T10AY are designed with higher clamping voltage and significantly higher peak pulse current (215A at 8/20µs) compared to the original part (37.7A at 10/1000µs). These parts operate under different pulse waveform specifications. Circuit-level evaluation is required to confirm that the 18.6V clamping voltage is compatible with downstream component voltage ratings.
Q: Is P6SMB10A suitable for this application?
A: P6SMB10A operates at 8.55V reverse standoff (0.05V above specification) with 14.5V clamping voltage and 42.1A peak pulse current. The slightly elevated standoff voltage and lower clamping voltage provide enhanced transient suppression. Application-specific circuit analysis is required to confirm compatibility with the original design intent.
Q: Which substitute carries automotive qualification?
A: SM6T10AY (STMicroelectronics) carries automotive grade and AEC-Q101 qualification, matching the original SMBJ8.5HE3/5B automotive specification. This part is recommended for automotive applications requiring certified components.
Q: Are all substitutes available in tape & reel packaging?
A: SMBJ8.5E3/TR13, SM6T10AY, SMBJ8.5A-13-F, and SMBJ8.5AE3/TR13 are specified with tape & reel (TR) or cut tape (CT) packaging suitable for automated assembly. SMBJ8.5A packaging is not specified in the provided data. Confirm packaging format with the supplier for your specific assembly process.
Q: What is the key parameter that determines substitutability?
A: Reverse standoff voltage (8.5V nominal) is the primary selection criterion. All substitutes must maintain this voltage specification within tolerance. Secondary criteria include clamping voltage (15.9V or lower for protective margin), peak pulse current (37.7A or higher), and DO-214AA (SMB) package compatibility. All listed substitutes meet these requirements.
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