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SMBJ8.5AE3/TR13 Equivalent & Substitute Parts
Part Overview
The SMBJ8.5AE3/TR13 is a transient voltage suppressor (TVS) diode manufactured by Microchip Technology, classified as a unidirectional Zener-type device in the DO-214AA (SMB) surface mount package. This component is designed for general-purpose transient voltage suppression applications, featuring an 8.5V reverse standoff voltage and 14.4V maximum clamping voltage at peak pulse current. The device is Active in product status and fully RoHS3 compliant with unlimited moisture sensitivity rating (MSL 1).
Equivalent and substitute parts are necessary when the primary part number becomes unavailable, when alternative manufacturers offer improved lead times or inventory levels, or when design flexibility permits selection from multiple qualified sources meeting identical or comparable electrical specifications.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Reverse Standoff (Typ) | 8.5 | V |
| Voltage - Breakdown (Min) | 9.44 | V |
| Voltage - Clamping (Max) @ Ipp | 14.4 | V |
| Current - Peak Pulse (10/1000µs) | 41.7 | A |
| Power - Peak Pulse | 600 | W |
| Operating Temperature Range | -65 to 150 | °C (TJ) |
| Package / Case | DO-214AA, SMB | — |
| Mounting Type | Surface Mount | — |
| Type | Zener | — |
| Unidirectional Channels | 1 | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitution of TVS diodes is determined by strict equivalence of electrical parameters within defined tolerance bands. The critical parameters governing substitution are:
Primary Equivalence Criteria:
- Voltage - Reverse Standoff (Typ): 8.5V nominal
- Voltage - Clamping (Max) @ Ipp: 14.4V maximum
- Current - Peak Pulse (10/1000µs): 41.7A nominal
- Power - Peak Pulse: 600W
- Package / Case: DO-214AA (SMB) surface mount
- Unidirectional Channels: 1
- Type: Zener
Secondary Compatibility Criteria:
- Operating Temperature Range: minimum -55°C to 150°C (SMBJ8.5AE3/TR13 extends to -65°C)
- RoHS3 Compliance
- MSL 1 rating
- Active product status
Parts are classified as Direct Equivalents when all primary criteria match exactly. Parts are classified as Similar when voltage or current parameters deviate within acceptable engineering tolerances while maintaining functional compatibility for general-purpose suppression applications.
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Voltage - Reverse Standoff (V) | Voltage - Clamping (V) | Current - Peak Pulse (A) | Operating Temp (°C) | Package | Inventory (Pcs) |
|---|---|---|---|---|---|---|---|
| SMBJ8.5AE3/TR13 | Microchip Technology | 8.5 | 14.4 | 41.7 | -65 to 150 | DO-214AA (SMB) | 687 |
| SMBJ8.5A | Taiwan Semiconductor Corporation | 8.5 | 14.4 | 43 | -55 to 150 | DO-214AA (SMB) | 44300 |
| SMBJ8.5A-13-F | Diodes Incorporated | 8.5 | 14.4 | 41.7 | -55 to 150 | DO-214AA (SMB) | 4300 |
| SMBJ8.5A-E3/52 | Vishay General Semiconductor - Diodes Division | 8.5 | 14.4 | 41.7 | -55 to 150 | DO-214AA (SMB) | 1950 |
| SMBJ8V5A | Fairchild Semiconductor | 8.5 | 14.4 | 41.7 | -55 to 150 | DO-214AA (SMB) | 35100 |
| P6SMB10A | Eaton - Electronics Division | 8.55 | 14.5 | 42.1 | -55 to 150 | DO-214AA (SMB) | 9100 |
| SM6T10A | STMicroelectronics | 8.55 | 18.6 | 215 (8/20µs) | -55 to 150 | DO-214AA (SMB) | 15230 |
| SM6T10A-E3/5B | Vishay General Semiconductor - Diodes Division | 8.55 | 14.5 | 41 | -65 to 150 | DO-214AA (SMB) | 3915 |
| SM6T10AY | STMicroelectronics | 8.55 | 18.6 | 215 (8/20µs) | -55 to 150 | DO-214AA (SMB) | 3376 |
Engineering Selection Recommendations
Direct Equivalents (Recommended Primary Substitutes):
The following parts meet all primary equivalence criteria and are suitable for direct substitution without design modification:
-
SMBJ8.5A (Taiwan Semiconductor Corporation): Identical voltage specifications with 43A peak pulse current (within 3.1% of original 41.7A). Operating temperature range -55°C to 150°C. RoHS3 compliant. Highest inventory availability (44,300 pcs).
-
SMBJ8.5A-13-F (Diodes Incorporated): Exact match on voltage and current specifications (41.7A). Operating temperature range -55°C to 150°C. RoHS3 compliant. Tape & Reel packaging. Inventory: 4,300 pcs.
-
SMBJ8.5A-E3/52 (Vishay General Semiconductor - Diodes Division): Exact match on voltage and current specifications (41.7A). Operating temperature range -55°C to 150°C. RoHS3 compliant. Tape & Reel packaging. Inventory: 1,950 pcs.
-
SMBJ8V5A (Fairchild Semiconductor): Exact match on voltage and current specifications (41.7A). Operating temperature range -55°C to 150°C. Bulk packaging. Inventory: 35,100 pcs.
Similar Parts (Acceptable for General-Purpose Applications):
The following parts exhibit minor deviations in voltage or current parameters but remain functionally compatible for general-purpose transient suppression:
-
P6SMB10A (Eaton - Electronics Division): Reverse standoff 8.55V (0.6% higher), clamping voltage 14.5V (0.7% higher), peak pulse current 42.1A (1% higher). Operating temperature -55°C to 150°C. RoHS compliant. Telecom-rated application. Inventory: 9,100 pcs.
-
SM6T10A-E3/5B (Vishay General Semiconductor - Diodes Division): Reverse standoff 8.55V (0.6% higher), clamping voltage 14.5V (0.7% higher), peak pulse current 41A (1.7% lower). Operating temperature range -65°C to 150°C (matches original temperature range). RoHS3 compliant. Inventory: 3,915 pcs.
Not Recommended for Direct Substitution:
- SM6T10A and SM6T10AY (STMicroelectronics): Clamping voltage 18.6V (29% higher) and peak pulse current 215A (8/20µs pulse definition differs from 10/1000µs standard). These devices are suitable only for applications requiring higher transient energy absorption and are not interchangeable with the original specification.
All recommended parts maintain RoHS3 compliance, MSL 1 rating, and Active product status.
Frequently Asked Questions (FAQ)
Q: Can SMBJ8.5A from Taiwan Semiconductor Corporation be used as a direct replacement for SMBJ8.5AE3/TR13?
A: Yes. The SMBJ8.5A meets all primary electrical specifications with identical 8.5V reverse standoff and 14.4V clamping voltage. Peak pulse current is 43A compared to 41.7A (3.1% variance within acceptable tolerance). Both devices use DO-214AA (SMB) surface mount packaging. Operating temperature range is -55°C to 150°C, which covers the application range of the original part. RoHS3 compliance is maintained.
Q: What is the difference between the 10/1000µs and 8/20µs pulse definitions referenced in the current specifications?
A: The pulse definition indicates the waveform shape used for measuring peak pulse current. The 10/1000µs definition (used by SMBJ8.5AE3/TR13) represents a 10-microsecond rise time and 1000-microsecond decay time. The 8/20µs definition (used by SM6T10A and SM6T10AY) represents an 8-microsecond rise time and 20-microsecond decay time. These different pulse shapes result in different measured current values for the same device. SM6T10A and SM6T10AY are not direct substitutes due to this specification difference and significantly higher clamping voltage.
Q: Is the operating temperature range difference between -65°C and -55°C significant for my application?
A: The difference is significant only if your application requires operation below -55°C. The SMBJ8.5AE3/TR13 and SM6T10A-E3/5B both specify -65°C minimum operating temperature, while other direct equivalents specify -55°C minimum. For applications operating at or above -55°C, all recommended parts are functionally equivalent. Verify your system's minimum operating temperature requirement before selection.
Q: Why does SMBJ8.5A from Taiwan Semiconductor Corporation show higher inventory (44,300 pcs) compared to the original part (687 pcs)?
A: Inventory levels reflect current stock availability from the supplier and do not indicate product quality or suitability. Higher inventory may indicate broader market adoption or different supply chain positioning. All parts listed are Active status products from established manufacturers with RoHS3 compliance and equivalent electrical specifications.
Q: Can I use P6SMB10A as a substitute if my design allows for slightly higher clamping voltage?
A: P6SMB10A exhibits 14.5V clamping voltage (0.7% higher than 14.4V specification) and 8.55V reverse standoff (0.6% higher than 8.5V specification). These minor deviations fall within typical manufacturing tolerances for TVS diodes. Substitution is acceptable only if your circuit design can tolerate the marginally higher clamping voltage without affecting downstream component protection or performance. Verify that protected components can withstand 14.5V transient peaks.
Q: What packaging options are available for these substitute parts?
A: All recommended direct equivalents use DO-214AA (SMB) surface mount packaging, matching the original SMBJ8.5AE3/TR13. Packaging variations include Tape & Reel (TR), Cut Tape (CT), and Bulk. The SMBJ8.5AE3/TR13 is supplied in Tape & Reel format. When selecting substitutes, verify that the packaging format (Tape & Reel, Bulk, or Cut Tape) matches your procurement and assembly requirements.
Q: Are all listed parts RoHS3 compliant?
A: All recommended direct equivalents and similar parts are RoHS3 compliant or RoHS compliant. Compliance status is maintained across all substitute options. REACH status is either REACH Unaffected or not specified, indicating no regulatory restrictions on use.
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