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SMDJ75C Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts
Part Overview
The SMDJ75C is a bidirectional transient voltage suppressor diode manufactured by Littelfuse, designed for general-purpose overvoltage protection in surface-mount applications. This part operates with a 75V reverse standoff voltage and provides clamping at 127.05V with a peak pulse current of 24.8A. The SMDJ75C is classified as obsolete, making identification of active equivalent and substitute parts essential for ongoing design support and procurement.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Reverse Standoff Voltage (Typ) | 75V |
| Breakdown Voltage (Min) | 78.93V |
| Clamping Voltage (Max) @ Ipp | 127.05V |
| Peak Pulse Current (10/1000µs) | 24.8A |
| Peak Pulse Power | 3000W (3kW) |
| Operating Temperature Range | -65°C to 150°C (TJ) |
| Package Type | DO-214AB (SMC) |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the SMDJ75C is determined by the following critical electrical and mechanical parameters:
- Reverse Standoff Voltage: Must be 75V (±tolerance as specified by manufacturer)
- Clamping Voltage Range: Acceptable range is 121V to 127.05V maximum
- Peak Pulse Current: Minimum 24.8A required for equivalent functionality
- Peak Pulse Power: Minimum 3000W (3kW) required
- Package: DO-214AB (SMC) surface-mount package mandatory
- Bidirectional Channels: Single channel (1) required
- Type: Zener diode technology
- Operating Temperature: Minimum -55°C to 150°C acceptable
Substitute parts are grouped into two categories based on peak pulse current and power rating:
Category A - Direct Electrical Equivalents (24.8A / 3kW): SMDJ75CA, SMC3K75CA-M3/57, SMC3K75CA-M3/9A, SMC3K75CAHM3/57, SMC3K75CAHM3/9A, SMCJ75CA-M3/57T, SMCJ75CA-M3/9AT
Category B - Enhanced Performance (41.4A / 5kW): 5.0SMLJ75CA-TP (higher current and power rating)
Category C - Reduced Performance (12.4A / 1.5kW): SMCJ75CA (lower current and power rating; use only if application permits)
Parameter Comparison
| Part Number | Manufacturer | Status | Standoff Voltage | Breakdown Voltage (Min) | Clamping Voltage (Max) | Peak Pulse Current | Peak Pulse Power | Operating Temp Range | Package | Qualification |
|---|---|---|---|---|---|---|---|---|---|---|
| SMDJ75C | Littelfuse | Obsolete | 75V | 78.93V | 127.05V | 24.8A | 3000W | -65°C to 150°C | DO-214AB (SMCJ) | — |
| SMDJ75CA | SMC Diode Solutions | Active | 75V | 83.3V | 121V | 24.8A | 3000W | -55°C to 150°C | DO-214AB (SMC) | — |
| 5.0SMLJ75CA-TP | Micro Commercial Co | Active | 75V | 83.3V | 121V | 41.4A | 5000W | -55°C to 175°C | DO-214AB (SMC) | — |
| SMC3K75CA-M3/57 | Vishay General Semiconductor | Active | 75V | 83.3V | 121V | 24.8A | 3000W | -55°C to 150°C | DO-214AB (SMCJ) | — |
| SMC3K75CA-M3/9A | Vishay General Semiconductor | Active | 75V | 83.3V | 121V | 24.8A | 3000W | -55°C to 150°C | DO-214AB (SMCJ) | — |
| SMC3K75CAHM3/57 | Vishay General Semiconductor | Active | 75V | 83.3V | 121V | 24.8A | 3000W | -55°C to 150°C | DO-214AB (SMCJ) | AEC-Q101 |
| SMC3K75CAHM3/9A | Vishay General Semiconductor | Active | 75V | 83.3V | 121V | 24.8A | 3000W | -55°C to 150°C | DO-214AB (SMCJ) | AEC-Q101 |
| SMCJ75CA | Fairchild Semiconductor | Active | 75V | 83.3V | 121V | 12.4A | 1500W | -55°C to 150°C | DO-214AB (SMC) | — |
| SMCJ75CA-M3/57T | Vishay General Semiconductor | Active | 75V | 83.3V | 121V | 12.4A | 1500W | -55°C to 150°C | DO-214AB (SMC) | — |
| SMCJ75CA-M3/9AT | Vishay General Semiconductor | Active | 75V | 83.3V | 121V | 12.4A | 1500W | -55°C to 150°C | DO-214AB (SMC) | — |
Engineering Selection Recommendations
Primary Recommendation: SMDJ75CA (SMC Diode Solutions) or SMC3K75CA-M3/57 (Vishay General Semiconductor) are direct electrical equivalents with identical peak pulse current (24.8A) and power rating (3kW). Both are active products with ROHS3 compliance and unlimited moisture sensitivity rating. These parts maintain the same functional performance as the obsolete SMDJ75C.
Automotive Applications: SMC3K75CAHM3/57 or SMC3K75CAHM3/9A (Vishay General Semiconductor) are qualified to AEC-Q101 automotive standard with identical electrical specifications. These parts are suitable for automotive-grade designs requiring transient voltage suppression.
Enhanced Performance Option: 5.0SMLJ75CA-TP (Micro Commercial Co) provides higher peak pulse current (41.4A) and power rating (5kW) with extended operating temperature range (-55°C to 175°C). This part is suitable for applications requiring higher transient energy absorption or elevated temperature operation.
Cost-Optimized Option: SMCJ75CA (Fairchild Semiconductor) operates at reduced peak pulse current (12.4A) and power rating (1.5kW). This part is suitable only for applications where lower transient energy levels are acceptable.
All recommended substitutes maintain the DO-214AB (SMC) surface-mount package, enabling direct PCB footprint compatibility without layout modifications.
Frequently Asked Questions (FAQ)
Q: Can SMCJ75CA replace SMDJ75C directly?
A: SMCJ75CA is electrically compatible but operates at half the peak pulse current (12.4A vs. 24.8A) and half the power rating (1.5kW vs. 3kW). Direct replacement is possible only if the application does not require the full 24.8A transient current handling capability.
Q: What is the difference between SMC3K75CA-M3/57 and SMC3K75CAHM3/57?
A: Both parts have identical electrical specifications (75V standoff, 121V clamping, 24.8A peak current, 3kW power). The HM3 variant (SMC3K75CAHM3/57) includes AEC-Q101 automotive qualification; the standard variant (SMC3K75CA-M3/57) does not. Select the HM3 variant for automotive applications.
Q: Is 5.0SMLJ75CA-TP a suitable replacement for SMDJ75C?
A: Yes. The 5.0SMLJ75CA-TP maintains the 75V standoff voltage and 121V clamping voltage. It provides enhanced performance with 41.4A peak current and 5kW power rating, making it suitable for applications requiring higher transient energy absorption. The extended temperature range (-55°C to 175°C) provides additional thermal margin.
Q: Are all substitute parts in the same package?
A: Yes. All substitute parts use the DO-214AB (SMC) surface-mount package, ensuring PCB footprint compatibility without layout changes.
Q: What is the operating temperature difference between SMDJ75C and its substitutes?
A: The SMDJ75C operates from -65°C to 150°C. Most active substitutes operate from -55°C to 150°C, representing a 10°C reduction in minimum operating temperature. The 5.0SMLJ75CA-TP extends the maximum to 175°C. Verify application temperature requirements before selection.
Q: Are all substitute parts RoHS3 compliant?
A: Yes. All active substitute parts listed are ROHS3 compliant with unlimited moisture sensitivity level (MSL 1), matching the compliance profile of the obsolete SMDJ75C.
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