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SMDJ85C Transient Voltage Suppressor - Equivalent & Substitute Parts
Part Overview
The SMDJ85C is a bidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., rated for 85V reverse standoff voltage with a 143.85V maximum clamping voltage. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement. The SMDJ85C operates across a temperature range of -65°C to 150°C and is housed in a DO-214AB (SMC) surface mount package, suitable for general-purpose transient protection applications.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | SMDJ85C |
| Manufacturer | Littelfuse Inc. |
| Category | Transient Voltage Suppressors (TVS) |
| Type | Zener |
| Bidirectional Channels | 1 |
| Voltage - Reverse Standoff (Typ) | 85V |
| Voltage - Breakdown (Min) | 89.28V |
| Voltage - Clamping (Max) @ Ipp | 143.85V |
| Current - Peak Pulse (10/1000µs) | 21.9A |
| Power - Peak Pulse | 3000W (3kW) |
| Operating Temperature Range | -65°C to 150°C (TJ) |
| Mounting Type | Surface Mount |
| Package / Case | DO-214AB, SMC |
| Product Status | Obsolete |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitute parts for the SMDJ85C are grouped based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:
- Voltage - Reverse Standoff (Typ): 85V (exact match required)
- Voltage - Breakdown (Min): 89.28V to 94.4V (acceptable range)
- Package / Case: DO-214AB, SMC (mechanical compatibility)
- Mounting Type: Surface Mount (assembly compatibility)
- Bidirectional Channels: 1 (functional equivalence)
- Type: Zener (device classification)
Substitute parts are divided into two performance categories based on current-handling capability and clamping voltage:
Category A - High Current Handling (20.8A to 21.9A): Parts with peak pulse current ratings of 20.8A or higher and 3000W peak pulse power, providing direct functional equivalence to the SMDJ85C.
Category B - Reduced Current Handling (10.4A to 11A): Parts with peak pulse current ratings below 20A and 1500W peak pulse power, suitable for applications with lower transient energy requirements.
Parameter Comparison
| Part Number | Manufacturer | Voltage - Reverse Standoff (Typ) | Voltage - Breakdown (Min) | Voltage - Clamping (Max) @ Ipp | Current - Peak Pulse (10/1000µs) | Power - Peak Pulse | Operating Temperature | Package | Product Status |
|---|---|---|---|---|---|---|---|---|---|
| SMDJ85C | Littelfuse Inc. | 85V | 89.28V | 143.85V | 21.9A | 3000W | -65°C to 150°C | DO-214AB, SMC | Obsolete |
| SMDJ85CA | Alpha & Omega Semiconductor Inc. | 85V | 94.4V | 137V | 21.9A | 3000W | -55°C to 150°C | DO-214AB, SMC | Active |
| SMCJ85CA | Fairchild Semiconductor | 85V | 94.4V | 137V | 11A | 1500W | -55°C to 150°C | DO-214AB, SMC | Active |
| SMCJ85CAE3/TR13 | Microchip Technology | 85V | 94.4V | 137V | 10.4A | 1500W | -65°C to 150°C | DO-214AB, SMC | Active |
| SMLJ85CA | Bourns Inc. | 85V | 94.4V | 137V | 20.8A | 3000W | -55°C to 150°C | DO-214AB, SMC | Active |
| SMLJ85CA-TP | Micro Commercial Co | 85V | 94.4V | 137V | 20.8A | 3000W | -55°C to 175°C | DO-214AB, SMC | Active |
| SMLJ85CAE3/TR13 | Microchip Technology | 85V | 94.4V | 137V | 20.8A | 300W | -55°C to 150°C | DO-214AB, SMC | Active |
| TV15C850JB-G | Comchip Technology | 85V | 94.4V | 137V | 10.95A | 1500W | -55°C to 150°C | DO-214AB, SMC | Active |
| TV15C850JB-HF | Comchip Technology | 85V | 94.4V | 137V | 10.95A | 1500W | -55°C to 150°C | DO-214AB, SMC | Active |
| TV30C850JB-G | Comchip Technology | 85V | 94.4V | 137V | 21.9A | 3000W | -55°C to 150°C | DO-214AB, SMC | Active |
Engineering Selection Recommendations
Primary Substitutes (Category A - Direct Functional Equivalence):
SMDJ85CA (Alpha & Omega Semiconductor Inc.) and TV30C850JB-G (Comchip Technology) provide the closest functional match to the SMDJ85C, maintaining 21.9A peak pulse current and 3000W peak pulse power ratings. Both are active products with ROHS3 compliance. SMDJ85CA operates across -55°C to 150°C, while TV30C850JB-G maintains the same temperature range. The SMDJ85CA is available in Tape & Reel packaging with 1440 units in stock.
SMLJ85CA (Bourns Inc.) and SMLJ85CA-TP (Micro Commercial Co) deliver equivalent performance with 20.8A peak pulse current and 3000W peak pulse power. SMLJ85CA-TP extends the upper operating temperature to 175°C and is available in bulk packaging. Both are active products with ROHS3 compliance.
Secondary Substitutes (Category B - Reduced Current Handling):
SMCJ85CA (Fairchild Semiconductor), SMCJ85CAE3/TR13 (Microchip Technology), TV15C850JB-G, and TV15C850JB-HF (Comchip Technology) are suitable for applications where peak pulse current requirements do not exceed 11A and peak pulse power does not exceed 1500W. These parts maintain the 85V reverse standoff voltage and DO-214AB package compatibility. SMCJ85CAE3/TR13 and TV15C850JB-G are available with high inventory levels (6526 and 915 units respectively).
Temperature Consideration:
SMCJ85CAE3/TR13 (Microchip Technology) maintains the original SMDJ85C operating temperature range of -65°C to 150°C, making it suitable for applications requiring extended low-temperature performance.
Note on SMLJ85CAE3/TR13:
This part exhibits a significantly reduced peak pulse power rating of 300W, which deviates substantially from the 3000W specification of the SMDJ85C. This part is not recommended as a direct substitute for applications requiring full transient energy absorption.
Frequently Asked Questions (FAQ)
Q: Can I use a Category B substitute (10.4A to 11A) in place of the SMDJ85C (21.9A)?
A: Category B substitutes are compatible only if your application's transient energy requirements do not exceed 1500W peak pulse power. If your circuit experiences transient pulses exceeding this threshold, Category A substitutes with 3000W ratings are required.
Q: What is the difference between the clamping voltage of the SMDJ85C (143.85V) and substitute parts (137V)?
A: The SMDJ85C specifies a maximum clamping voltage of 143.85V, while most active substitute parts specify 137V. This 6.85V difference represents a tighter clamping characteristic in the substitute parts, which provides improved transient suppression. Both values fall within acceptable operating margins for 85V standoff voltage applications.
Q: Are all substitute parts available in the same DO-214AB package?
A: Yes, all listed substitute parts are housed in the DO-214AB (SMC) surface mount package, ensuring mechanical and assembly compatibility with the original SMDJ85C footprint.
Q: Which substitute offers the widest operating temperature range?
A: SMLJ85CA-TP (Micro Commercial Co) extends the upper operating temperature to 175°C, compared to the standard 150°C maximum of most alternatives. SMCJ85CAE3/TR13 (Microchip Technology) maintains the original -65°C to 150°C range of the SMDJ85C.
Q: What is the inventory status of recommended substitutes?
A: SMLJ85CA (Bourns Inc.) offers the highest inventory availability with 25,747 units in stock. SMDJ85CA (Alpha & Omega Semiconductor Inc.) has 1,440 units available. SMCJ85CA (Fairchild Semiconductor) provides 6,526 units. All recommended substitutes are classified as active products.
Q: Are all substitute parts RoHS3 compliant?
A: All listed substitute parts are ROHS3 compliant, maintaining environmental and regulatory compatibility with the original SMDJ85C specification.
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