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STMicroelectronics SMC30J48CA
- Part No.:
- SMC30J48CA
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC30J48CA.pdf
- Description:
- TVS DIODE 48VWM 76.6VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:1,897
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Product details
Overview
SMC30J48CA from STMicroelectronics is a bidirectional transient voltage suppression (TVS) diode designed for high-energy surge protection in DC power lines and signal interfaces. It delivers 3000 W peak pulse power (10/1000 μs), clamps at 76.6 V (max) under 468 A surge current, and operates up to 175 °C junction temperature - enabling robust protection in industrial power supplies, telecom infrastructure, and automotive body electronics.
For engineers reviewing the SMC30J48CA datasheet, SMC30J48CA pinout, SMC30J48CA application, or SMC30J48CA equivalent, key selection criteria include its 48 V standoff voltage, bidirectional polarity, low 0.2 µA leakage at 25 °C, JEDEC-standard SMC package, and IEC 61000-4-2 ±30 kV ESD compliance - all critical for reliable overvoltage hardening in high-reliability systems.
Technical Context
The SMC30J48CA uses planar silicon avalanche technology to achieve precise breakdown voltage control (VBR = 53.2–58.8 V at 1 mA) and low dynamic resistance (RD = 101 Ω). Its bidirectional structure enables symmetrical clamping for AC-coupled or floating signal paths without polarity constraints.
Thermal design is supported by a maximum junction temperature of 175 °C and thermal impedance of ~100 °C/W on standard FR4 PCBs. The device meets IEC 61000-4-4 Level 4 (4 kV) and exceeds IEC 61000-4-2 Level 4 (±30 kV contact/air discharge), making it suitable for harsh electromagnetic environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 48 V - Maximum continuous reverse operating voltage before significant leakage begins; defines system DC rail compatibility. |
| Breakdown Voltage (VBR) | 53.2–58.8 V at 1 mA - Tight tolerance ensures predictable turn-on during transients; supports stable protection margin design. |
| Clamping Voltage (VCL) | 76.6 V max at 468 A (10/1000 μs) - Limits downstream voltage stress during worst-case surges; enables safe IC interface protection. |
| Peak Pulse Power | 3000 W (10/1000 μs) - Sustains high-energy transients typical of lightning-induced surges in industrial power inputs. |
| Leakage Current | 0.2 µA at 48 V and 25 °C - Minimizes standby power loss and avoids false triggering in high-impedance sensing circuits. |
| Junction Temperature Range | −55 to +175 °C - Enables operation in under-hood automotive, outdoor telecom, and high-ambient industrial enclosures. |
| ESD Withstand | ±30 kV (IEC 61000-4-2, air & contact) - Exceeds Level 4 requirements; eliminates need for secondary ESD stages in front-end protection. |
Pinout & Package
The SMC30J48CA is housed in a JEDEC-standard SMC (DO-214AB) surface-mount package with matte tin-plated leads, optimized for automated assembly and high thermal dissipation on FR4 PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Marked Band) | Reference terminal for unidirectional devices; symmetric node for bidirectional | In bidirectional configuration (CA suffix), both terminals are functionally identical - no polarity sensitivity; simplifies layout in AC or differential lines. |
| Anode | Reference terminal for unidirectional devices; symmetric node for bidirectional | Same as cathode in CA version - forms a symmetrical clamp pair; allows placement without orientation checks during pick-and-place. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, RS-485 buses, or floating sensor outputs without external polarity management. |
| Low dynamic resistance (101 Ω) | Reduces clamping voltage rise under high-current surges - critical for protecting 5 V or 3.3 V logic interfaces downstream. |
| High-temperature operation (175 °C Tj) | Supports placement near heat-generating components (e.g., MOSFETs, inductors) without derating or thermal shutdown concerns. |
| JEDEC-registered SMC footprint | Ensures mechanical and thermal compatibility with existing PCB land patterns and reflow profiles across manufacturing sites. |
| UL94 V0 flammability rating | Meets safety standards for enclosed industrial equipment and power converters requiring non-propagating flame behavior. |
Applications
| Industrial Power Input Protection | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: 24 V DC input stage of programmable logic controllers (PLCs) exposed to load dump and inductive switching transients. IC Role / Device Role / Timing Role: Primary surge clamp placed upstream of DC-DC converters and microcontroller power rails. Use Value: Clamps 468 A surges to ≤76.6 V within nanoseconds, preventing latch-up or permanent damage to downstream 48 V-rated regulators and CAN transceivers. |
Use Scenario: LIN bus and power window motor driver circuits subject to battery reverse connection and jump-start spikes. IC Role / Device Role / Timing Role: Bidirectional TVS on shared 12 V supply lines feeding multiple BCM submodules. Use Value: Symmetric clamping protects both positive and negative transients without polarity-dependent failure modes - eliminating dual-diode solutions. |
| Telecom DC Feeder Protection | RS-485 Data Line Hardening |
|
Use Scenario: −48 V DC power feeders in remote radio units (RRUs) subjected to lightning-induced common-mode surges. IC Role / Device Role / Timing Role: High-power TVS on primary DC input before DC-DC isolation stage. Use Value: 3000 W pulse handling sustains multi-kA induced surges while maintaining <0.2 µA leakage to avoid affecting -48 V monitoring accuracy. |
Use Scenario: Termination points of long-haul RS-485 networks in factory automation, vulnerable to ESD and ground loop transients. IC Role / Device Role / Timing Role: Bidirectional clamp across differential pair (A/B) referenced to local ground. Use Value: ±30 kV ESD immunity prevents communication lockup or transceiver latch-up - validated per IEC 61000-4-2 test conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ48CA (Bourns) | Lower peak power (600 W), higher clamping voltage (83.5 V @ 38.5 A), SMB package (smaller thermal mass) | Restricted to lower-energy surges; unsuitable for 3000 W IEC 61000-4-4 events | Select only when space-constrained layouts preclude SMC and surge energy remains below 600 W. |
| SAC48CA (Littelfuse) | Same 48 V standoff and bidirectional function, but 1500 W rating (10/1000 μs) and 82 V clamping at 220 A | Limited to medium-risk environments (e.g., indoor consumer gear); not rated for industrial lightning surge classes | Choose where cost sensitivity outweighs need for full 3000 W headroom and extended thermal margin. |
Compared with SMBJ48CA and SAC48CA, the SMC30J48CA provides 2×–5× higher surge energy handling, tighter clamping, and superior high-temperature reliability - making it the only option qualified for EN 61000-4-4 Level 4 and automotive under-hood deployment.
Availability
SMC30J48CA is available at Aetrix Electronics and suitable for industrial power input protection, automotive body control modules, telecom DC feeder hardening, and RS-485 data line surge suppression requiring stable component supply across multi-year production cycles.
Supply support for SMC30J48CA includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in power management, analog, MEMS, and microcontrollers for industrial, automotive, and consumer markets.
The SMC30J TVS series targets high-reliability overvoltage protection in demanding environments - engineered specifically for 3000 W surge resilience, ultra-low leakage, and 175 °C operation in industrial and automotive power systems.
FAQ
What is the difference between SMC30J48A and SMC30J48CA?
The "A" suffix denotes unidirectional TVS operation (anode-cathode polarity), while "CA" indicates bidirectional symmetry - meaning both terminals behave identically under positive or negative transients. SMC30J48CA is required for AC-coupled, differential, or floating signal lines where polarity cannot be guaranteed, whereas SMC30J48A suits DC rails with defined ground reference.
Can SMC30J48CA replace older SMCJ48CA devices?
Yes - SMC30J48CA is a direct functional upgrade to SMCJ48CA, offering identical 48 V standoff and bidirectional operation but with enhanced 3000 W peak power (vs. 1500 W), lower clamping voltage (76.6 V vs. ~85 V), and extended 175 °C junction rating (vs. 150 °C). No layout changes are needed due to identical SMC package and footprint.
Does SMC30J48CA require derating above 25 °C ambient?
Yes - peak pulse power must be reduced linearly above 25 °C ambient per Figure 3 in DS8598. At 85 °C ambient, PPP drops to ~2200 W for 10/1000 μs pulses. Derating is managed via thermal design: copper area under each lead directly lowers Rth(j-a), as shown in Figure 12 - 2 cm² per pad reduces thermal resistance to ~60 °C/W.
Is SMC30J48CA compliant with AEC-Q200 for automotive use?
No - SMC30J48CA is not AEC-Q200 qualified. While it meets automotive-relevant specs (175 °C Tj, ±30 kV ESD, load dump surge capability), ST does not list it in their AEC-Q200-certified portfolio. For AEC-Q200-compliant alternatives, consider ST's SMAJ48CA-Q or SMF48CA-Q series, which undergo full stress testing per the standard.
SMC30J48CA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AB, SMC
- Series:
- SMC30J
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 48V
- Voltage - Breakdown (Min):
- 53.2V
- Voltage - Clamping (Max) @ Ipp:
- 76.6V
- Current - Peak Pulse (10/1000µs):
- 38A
- Power - Peak Pulse:
- 3000W (3kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMC
SMC30J48CA FAQ
1.How can I place an order for SMC30J48CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC30J48CA on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SMC30J48CA reliable?
The price and inventory of SMC30J48CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC30J48CA is usually 5 days.
3.What payment methods are accepted for SMC30J48CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC30J48CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC30J48CA?
SMC30J48CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC30J48CA order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SMC30J48CA?
For technical support, including SMC30J48CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC30J48CA requirements.
6.How does Aetrix verify that SMC30J48CA is sourced from the original manufacturer or authorized distributors?
All SMC30J48CA products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SMC30J48CA meets industry standards.
7.What is the process for return or replacement of SMC30J48CA?
All SMC30J48CA units undergo pre-shipment inspection (PSI). If there is an issue with SMC30J48CA, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SMC30J48CA part is unused and in its original packaging.
Return procedure for SMC30J48CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC30J48CA Tags
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