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SMB8J36C-E3/52 Equivalent & Substitute Parts
Part Overview
The SMB8J36C-E3/52 is a transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 36V reverse standoff voltage with a 64.3V maximum clamping voltage and 12.4A peak pulse current capability in a DO-214AA (SMB) package. The part is currently 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 |
|---|---|
| Manufacturer Part Number | SMB8J36C-E3/52 |
| Manufacturer | Vishay General Semiconductor - Diodes Division |
| Category | Transient Voltage Suppressors (TVS) |
| Package / Case | DO-214AA, SMB |
| Voltage - Reverse Standoff (Typ) | 36V |
| Voltage - Breakdown (Min) | 40V |
| Voltage - Clamping (Max) @ Ipp | 64.3V |
| Current - Peak Pulse (10/1000µs) | 12.4A |
| Power - Peak Pulse | 800W |
| Operating Temperature Range | -55°C ~ 150°C (TJ) |
| Mounting Type | Surface Mount |
| Type | Zener |
| Bidirectional Channels | 1 |
| RoHS Status | ROHS3 Compliant |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitution of the SMB8J36C-E3/52 is determined by the following critical parameters that must remain constant across equivalent parts:
Fixed Parameters (Non-Negotiable):
- Reverse Standoff Voltage: 36V
- Breakdown Voltage (Min): 40V
- Package / Case: DO-214AA, SMB
- Mounting Type: Surface Mount
- Bidirectional Channels: 1
- Type: Zener
Variable Parameters (Allowable Ranges):
- Voltage - Clamping (Max) @ Ipp: 58.1V to 76V
- Current - Peak Pulse (10/1000µs): 10.3A to 52A
- Power - Peak Pulse: 600W to 800W
- Operating Temperature Range: -65°C to 175°C
Substitute parts must maintain the 36V standoff voltage specification and DO-214AA package form factor. Variations in clamping voltage, peak pulse current, and power dissipation are acceptable provided the application requirements are met. All identified substitutes are active products with current manufacturing status, ensuring long-term availability and supply chain continuity.
Parameter Comparison
| Parameter | SMB8J36C-E3/52 (Main) | SMB8J36CA-E3/52 | 1SMB36CA TR13 PBFREE | SM6T42CAY | SMBJ36CA | SMBJ36CA-HR | SMBJ36CA-HRA | SMBJ36CA-TP | SMBJ36CA-TR |
|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | Vishay | Vishay | Central Semiconductor | STMicroelectronics | MDD | Littelfuse | Littelfuse | Micro Commercial Co | STMicroelectronics |
| Voltage - Reverse Standoff (Typ) | 36V | 36V | 36V | 36V | 36V | 36V | 36V | 36V | 36V |
| Voltage - Breakdown (Min) | 40V | 40V | 40V | 40V | 40V | 40V | 40V | 40V | 40V |
| Voltage - Clamping (Max) @ Ipp | 64.3V | 58.1V | 58.1V | 76V | 58.1V | 58.1V | 58.1V | 58.1V | 58.1V |
| Current - Peak Pulse (10/1000µs) | 12.4A | 13.8A | 10.3A | 52A (8/20µs) | 10.4A | 10.4A | 10.4A | 10.3A | 10.3A |
| Power - Peak Pulse | 800W | 800W | 600W | 600W | 600W | 600W | 600W | 600W | 600W |
| Operating Temperature Range | -55°C ~ 150°C | -55°C ~ 150°C | -65°C ~ 150°C | -55°C ~ 150°C | -50°C ~ 150°C | -65°C ~ 150°C | -65°C ~ 150°C | -55°C ~ 175°C | -55°C ~ 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 | DO-214AA, SMB |
| Product Status | Obsolete | Active | Active | Active | Active | Active | Active | Active | Active |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
Engineering Selection Recommendations
All identified substitute parts maintain the core electrical specifications required for 36V standoff voltage protection in DO-214AA surface-mount packages. Selection among active alternatives should be based on the following criteria:
Primary Tier (Direct Electrical Equivalents): SMB8J36CA-E3/52, SMBJ36CA-TR, SMBJ36CA-TP, and SMBJ36CA from multiple manufacturers (Vishay, STMicroelectronics, Micro Commercial Co, MDD) provide 58.1V clamping voltage with 10.3–13.8A peak pulse current. These parts are suitable for applications where the original 64.3V clamping specification can be relaxed to 58.1V without compromising circuit protection margins.
Secondary Tier (Higher Performance Alternative): SM6T42CAY from STMicroelectronics offers 76V clamping voltage with significantly higher 52A peak pulse current (8/20µs pulse definition), providing enhanced transient suppression capability. This part includes AEC-Q101 automotive qualification and is appropriate for demanding applications requiring superior surge handling.
Availability and Supply Chain: SMBJ36CA-TR (STMicroelectronics) maintains the highest inventory level (58,262 pcs), ensuring consistent supply. SMBJ36CA-HR and SMBJ36CA-HRA from Littelfuse provide extended temperature range operation (-65°C minimum) compared to the original specification (-55°C minimum).
All substitute parts are ROHS3 compliant and REACH unaffected, maintaining regulatory compliance with the original component.
Frequently Asked Questions (FAQ)
Q: Can SMB8J36CA-E3/52 directly replace SMB8J36C-E3/52?
A: Yes. Both parts share identical 36V standoff voltage, 40V minimum breakdown voltage, and DO-214AA package specifications. The primary difference is clamping voltage: 58.1V versus 64.3V. This substitution is valid provided the application circuit tolerates the lower clamping voltage without exceeding component stress limits.
Q: What is the difference between the 58.1V clamping variants and SM6T42CAY?
A: SM6T42CAY provides 76V clamping voltage with 52A peak pulse current (measured at 8/20µs pulse width), compared to 10.3–13.8A at 10/1000µs for the 58.1V variants. SM6T42CAY is suitable for applications requiring higher transient energy absorption. The different pulse width specifications reflect different measurement standards; direct comparison requires application-specific analysis.
Q: Are all substitute parts available in tape and reel packaging?
A: Most substitutes are available in tape and reel (TR) or cut tape (CT) formats. SMBJ36CA from MDD is available in standard packaging without specified reel format. Verify packaging availability with your supplier for production requirements.
Q: Does operating temperature range affect substitution compatibility?
A: Operating temperature range does not affect electrical substitution compatibility. The original part operates -55°C to 150°C. Alternatives with extended ranges (-65°C to 175°C) provide additional margin but are not required for direct replacement. Select based on your application's thermal environment.
Q: Are all substitutes RoHS and REACH compliant?
A: Yes. All identified substitute parts are ROHS3 compliant and REACH unaffected, maintaining regulatory alignment with the original SMB8J36C-E3/52 component.
Q: Which substitute offers the best long-term availability?
A: SMBJ36CA-TR from STMicroelectronics maintains the highest current inventory (58,262 pcs) and active product status, providing optimal supply chain continuity for new designs and ongoing production.
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