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SMCJ48C-E3/9AT Equivalent & Substitute Parts
Part Overview
The SMCJ48C-E3/9AT 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 bidirectional Zener diode operates with a 48V reverse standoff voltage and provides clamping at 85.5V maximum with a peak pulse current of 17.5A. The part is currently listed as obsolete, making equivalent substitutes necessary for ongoing design support and component procurement.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Reverse Standoff Voltage (Typ) | 48V |
| Breakdown Voltage (Min) | 53.3V |
| Clamping Voltage (Max) @ Ipp | 85.5V |
| Peak Pulse Current (10/1000µs) | 17.5A |
| Peak Pulse Power | 1500W |
| Operating Temperature Range | -55°C to 150°C |
| Package Type | DO-214AB (SMC) |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution for the SMCJ48C-E3/9AT is determined by strict electrical and mechanical compatibility criteria:
Primary Substitution Criteria:
- Reverse standoff voltage: 48V (exact match required)
- Breakdown voltage minimum: 53.3V (exact match required)
- Package type: DO-214AB / SMC (exact match required)
- Mounting type: Surface Mount (exact match required)
- Bidirectional channels: 1 (exact match required)
- Type: Zener (exact match required)
Secondary Compatibility Parameters:
- Clamping voltage tolerance: 77.4V to 85.5V acceptable
- Peak pulse current: 17.5A to 19.4A acceptable for standard power rating; 64.7A acceptable for enhanced power rating variants
- Peak pulse power: 1500W standard or 5000W enhanced variants
- Operating temperature: -55°C to 150°C minimum; extended ranges (-65°C or higher upper limits) acceptable
- RoHS3 compliance and MSL 1 rating required
Substitutes are grouped into two categories: standard 1500W variants and enhanced 5000W variants. All substitutes maintain the core 48V protection specification while offering different clamping characteristics and current ratings.
Parameter Comparison
| Part Number | Manufacturer | Clamping Voltage (Max) | Peak Pulse Current | Peak Pulse Power | Operating Temp Range | Product Status |
|---|---|---|---|---|---|---|
| SMCJ48C-E3/9AT | Vishay General Semiconductor | 85.5V | 17.5A | 1500W | -55°C to 150°C | Obsolete |
| SMCJ48CA-E3/9AT | Vishay General Semiconductor | 77.4V | 19.4A | 1500W | -55°C to 150°C | Active |
| SMCJ48CE3/TR13 | Microchip Technology | 85.5V | 17.5A | 1500W | -65°C to 150°C | Active |
| 5.0SMDJ48CA | MDE Semiconductor Inc | 77.4V | 64.7A | 5000W | -55°C to 150°C | Active |
| 5.0SMLJ48CA-TP | Micro Commercial Co | 77.4V | 64.7A | 5000W | -55°C to 175°C | Active |
| SMCJ48CA | Fairchild Semiconductor | 77.4V | 19.4A | 1500W | -55°C to 150°C | Active |
| SMCJ48CA-13-F | Diodes Incorporated | 77.4V | 19.4A | 1500W | -55°C to 150°C | Active |
| SMCJ48CA-HR | Littelfuse Inc. | 77.4V | 19.4A | 1500W | -65°C to 150°C | Active |
| SMCJ48CA-TR | STMicroelectronics | 100V | 100A (8/20µs) | 1500W | -55°C to 150°C | Active |
| SMCJ48CAE3/TR13 | Microchip Technology | 77.4V | 19.4A | 1500W | -65°C to 150°C | Active |
Engineering Selection Recommendations
Direct Replacement (Highest Compatibility): SMCJ48CE3/TR13 (Microchip Technology) provides the closest electrical match to the obsolete SMCJ48C-E3/9AT, maintaining identical clamping voltage (85.5V) and peak pulse current (17.5A) specifications. This part is active and available in high volume (1100 pcs), with extended operating temperature range (-65°C to 150°C) and RoHS3 compliance.
Standard Power Alternatives (1500W Rating): SMCJ48CA-E3/9AT, SMCJ48CA, SMCJ48CA-13-F, SMCJ48CA-HR, and SMCJ48CAE3/TR13 are all active substitutes with identical 48V standoff voltage and 1500W power rating. These parts differ in clamping voltage (77.4V vs. 85.5V) and peak pulse current (19.4A vs. 17.5A). All maintain RoHS3 compliance and MSL 1 rating. Selection among these depends on packaging preference (Cut Tape, Tape & Reel, or bulk) and temperature range requirements.
Enhanced Power Alternatives (5000W Rating): 5.0SMDJ48CA (MDE Semiconductor Inc) and 5.0SMLJ48CA-TP (Micro Commercial Co) provide significantly higher peak pulse power (5000W) and peak pulse current (64.7A) while maintaining the 48V standoff voltage and 77.4V clamping voltage. These are suitable for applications requiring enhanced transient energy absorption. 5.0SMLJ48CA-TP offers extended operating temperature to 175°C.
Not Recommended: SMCJ48CA-TR (STMicroelectronics) exhibits non-standard clamping voltage (100V) and peak pulse current (100A with 8/20µs pulse), deviating significantly from the original specification and introducing incompatibility risk.
Frequently Asked Questions (FAQ)
Q: Can SMCJ48CA-E3/9AT replace SMCJ48C-E3/9AT directly? A: Yes, with electrical performance consideration. Both maintain 48V standoff voltage and 1500W power rating. SMCJ48CA-E3/9AT has lower clamping voltage (77.4V vs. 85.5V) and higher peak pulse current (19.4A vs. 17.5A). This is acceptable if circuit design tolerates the lower clamping threshold.
Q: What is the difference between standard (1500W) and enhanced (5000W) variants? A: Enhanced variants (5.0SMDJ48CA, 5.0SMLJ48CA-TP) provide four times the peak pulse power and significantly higher peak pulse current (64.7A vs. 17.5-19.4A). Use enhanced variants only if transient energy absorption requirements exceed 1500W, as oversizing increases capacitance and may affect circuit performance.
Q: Are all substitutes RoHS3 compliant? A: Yes, all listed substitutes are RoHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the original part specification.
Q: Does operating temperature range affect substitution? A: Operating temperature range is a secondary consideration. The original part operates -55°C to 150°C. Substitutes with extended ranges (-65°C upper limit or higher maximum temperature) are acceptable and provide additional design margin. Temperature range does not restrict substitution if the application operates within the substitute's specified range.
Q: Can I use SMCJ48CA-TR as a substitute? A: Not recommended. SMCJ48CA-TR deviates significantly from the original specification with 100V clamping voltage and 100A peak pulse current (8/20µs pulse definition), introducing incompatibility risk and potential circuit malfunction.
Q: What packaging options are available? A: Substitutes are available in Cut Tape (CT) & Digi-Reel®, Tape & Reel (TR), and bulk packaging. All maintain DO-214AB (SMC) package type and surface-mount configuration. Packaging selection depends on procurement volume and assembly process requirements.
Q: Is SMCJ48CE3/TR13 the best substitute? A: SMCJ48CE3/TR13 provides the closest electrical match with identical clamping voltage and peak pulse current, plus extended temperature range and active product status. It is the recommended primary substitute for direct replacement applications.
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