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STMicroelectronics SMC30J48A
- Part No.:
- SMC30J48A
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC30J48A.pdf
- Description:
- TVS DIODE 48VWM 76.6VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:6,261
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Product details
Overview
SMC30J48A from STMicroelectronics is a unidirectional 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 under 468 A surge current, and operates up to 175 °C junction temperature-enabling robust protection in industrial power supplies and telecom infrastructure.
For engineers reviewing the SMC30J48A datasheet, SMC30J48A pinout, SMC30J48A application, or SMC30J48A equivalent, key selection criteria include its 48 V standoff voltage, low 0.2 µA leakage at 25 °C, JEDEC-registered SMC package, and IEC 61000-4-2 ±30 kV ESD compliance-critical for reliable front-end protection in harsh environments.
Technical Context
This planar-junction TVS diode uses silicon avalanche technology to provide fast response (<1 ns) to transients while maintaining low dynamic resistance (101 mΩ) and stable clamping performance across temperature. Its unidirectional configuration supports DC-biased lines where reverse conduction must be blocked.
The device meets IEC 61000-4-4 level 4 (4 kV), exceeds IEC 61000-4-2 level 4 (±30 kV air/contact discharge), and features a thermal impedance of <100 °C/W on standard FR4 PCB footprints-ensuring sustained reliability under repeated surge stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 48 V - Maximum continuous DC operating voltage before breakdown begins. |
| Breakdown Voltage (VBR) | 53.2–58.8 V at 1 mA - Ensures precise triggering margin above nominal line voltage. |
| Clamping Voltage (VCL) | 76.6 V at 468 A (10/1000 μs) - Limits downstream voltage stress during worst-case surge events. |
| Peak Pulse Power | 3000 W (10/1000 μs) - Supports high-energy surges common in industrial AC/DC inputs and PoE systems. |
| Leakage Current (IRM) | 0.2 µA at 48 V, 25 °C - Minimizes standby power loss and avoids false triggering in low-power circuits. |
| Junction Temperature Range | −55 to +175 °C - Enables operation in under-hood automotive, base station, and industrial control environments. |
| ESD Withstand | ±30 kV contact & air discharge (IEC 61000-4-2) - Eliminates need for secondary ESD stages in USB, RS-485, and sensor interfaces. |
Pinout & Package
SMC30J48A is housed in a JEDEC-registered SMC (DO-214AB) surface-mount package with matte tin-plated leads, optimized for automated assembly and high thermal dissipation. The package measures 7.75–8.15 mm × 5.55–6.25 mm × 2.45 mm max height and supports IPC-7531-compliant footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Surge return path for unidirectional clamping | Connected to system ground or low-side reference; conducts only during positive transients relative to cathode. |
| Cathode (K) | Protected line connection | Connected to the line being protected (e.g., +48 V rail); blocks reverse current and clamps positive overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| High surge capability | 3000 W (10/1000 μs) and up to 40 kW (8/20 μs) - Handles lightning-induced surges in telecom and industrial power inputs. |
| Low clamping ratio | VCL/VBR = 1.44 - Minimizes overvoltage exposure to downstream ICs without excessive derating. |
| High-temperature stability | Rated to 175 °C junction temperature - Maintains specification integrity in enclosed, thermally constrained enclosures. |
| Low leakage & high reliability | 0.2 µA @ VRM, 25 °C; JESD201 Class 2 whisker tested - Reduces long-term drift and field failure risk in 10+ year deployments. |
| Standardized mechanical interface | JEDEC DO-214AB outline + IPC-7531 footprint - Ensures drop-in compatibility with existing SMC-layout PCBs and pick-and-place tooling. |
Applications
| Industrial Power Supply Input Protection | Telecom 48 V DC Distribution |
|---|---|
|
Use Scenario: Protecting rectified AC input or bulk DC bus against lightning-induced surges and load dump transients in DIN-rail mounted PSUs. IC Role / Device Role / Timing Role: Primary clamping element placed upstream of input filter capacitors and PFC controllers. Use Value: Clamps 468 A surges to ≤76.6 V, preventing damage to bridge rectifiers, MOSFETs, and controller ICs rated for ≤100 V absolute maximum. |
Use Scenario: Safeguarding 48 V backplane distribution in telecom cabinets against hot-swap transients and cable discharge events. IC Role / Device Role / Timing Role: Unidirectional TVS placed per rail at card-edge connectors and power entry modules. Use Value: Withstands ±30 kV ESD and 4 kV EFT without degradation, ensuring uninterrupted service during maintenance and field upgrades. |
| RS-485/422 Data Line Protection | Automotive Body Control Module (BCM) Power Input |
|
Use Scenario: Shielding differential data lines in factory automation networks exposed to motor drive noise and ground bounce. IC Role / Device Role / Timing Role: Low-capacitance TVS (typ. 120 pF at 0 V) placed between A/B lines and ground. Use Value: Sub-1 ns response preserves signal integrity up to 20 Mbps while limiting common-mode overvoltage to safe levels for transceiver ICs. |
Use Scenario: Protecting 48 V auxiliary power inputs in commercial vehicle BCMs subjected to ISO 7637-2 pulse 1/2/5a/b. IC Role / Device Role / Timing Role: First-line transient suppressor on main power feed before DC-DC converters and microcontrollers. Use Value: Survives 175 °C ambient operation and repeated 3000 W surges-meeting AEC-Q101 requirements when used with appropriate derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ48A (ON Semiconductor) | Lower peak power (600 W), higher clamping voltage (77.4 V @ 43.5 A), SMB package (smaller thermal mass) | Limited to lower-energy surges; unsuitable for IEC 61000-4-4 level 4 or repeated 3000 W events | Select only for space-constrained, low-risk consumer applications where cost outweighs surge margin. |
| 1.5KE48A (Littelfuse) | Through-hole DO-201 package, same 48 V VRM, but 1500 W rating and higher leakage (5 µA) | Requires manual soldering; not suitable for high-volume SMT production or high-reliability thermal cycling | Use only for legacy through-hole designs or prototyping where rework tolerance is prioritized over production efficiency. |
Compared with SMBJ48A and 1.5KE48A, SMC30J48A provides 5× higher surge energy handling, 0.2 µA leakage (vs. 5 µA), and SMC packaging for automated manufacturing-making it the preferred choice for industrial-grade, high-volume, and thermally demanding applications.
Availability
SMC30J48A is available at Aetrix Electronics and suitable for industrial power supply input protection, telecom 48 V DC distribution, RS-485/422 data line protection, and automotive BCM power input requiring stable component supply and long-term lifecycle assurance.
Supply support for SMC30J48A 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 microcontroller technologies for industrial, automotive, and consumer markets.
The SMC30J series belongs to ST's high-power TVS portfolio, engineered specifically for robust front-end surge immunity in 48 V–188 V DC systems-addressing design challenges in telecom infrastructure, renewable energy inverters, and smart grid equipment.
FAQ
What is the maximum surge current SMC30J48A can handle without failure?
SMC30J48A is rated for 468 A peak pulse current under the standard 10/1000 μs waveform, corresponding to 3000 W peak power. It also withstands up to 100 A under the more severe 8/20 μs waveform (40 kW), verified per IEC 61000-4-5 testing conditions and documented in DS8598 Rev 8.
Is SMC30J48A suitable for bidirectional signal line protection?
No-SMC30J48A is unidirectional and conducts only during positive transients relative to its cathode. For bidirectional protection (e.g., USB, CAN, or AC-coupled lines), the SMC30J48CA variant must be used, which provides symmetrical clamping in both polarities.
How does junction temperature affect clamping voltage performance?
Clamping voltage increases with junction temperature at a coefficient of +10.3 × 10⁻⁴/°C. At 150 °C, VCL rises by ~1.3 V versus 25 °C (76.6 V → ~77.9 V), a predictable shift accounted for in system-level overvoltage margining per Equation 2 in DS8598.
Does SMC30J48A meet automotive qualification standards?
SMC30J48A is not AEC-Q101 qualified out-of-the-box, but its 175 °C junction rating, JEDEC MSL Level 1 moisture sensitivity, and robust construction enable use in automotive applications when validated per ISO 7637-2 and customer-specific reliability testing-common practice for non-qualified TVS devices in BCM and telematics modules.
SMC30J48A 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:
- 1
- Bidirectional Channels:
- -
- 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
SMC30J48A FAQ
1.How can I place an order for SMC30J48A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC30J48A 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 SMC30J48A reliable?
The price and inventory of SMC30J48A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC30J48A is usually 5 days.
3.What payment methods are accepted for SMC30J48A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC30J48A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC30J48A?
SMC30J48A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC30J48A 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 SMC30J48A?
For technical support, including SMC30J48A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC30J48A requirements.
6.How does Aetrix verify that SMC30J48A is sourced from the original manufacturer or authorized distributors?
All SMC30J48A 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 SMC30J48A meets industry standards.
7.What is the process for return or replacement of SMC30J48A?
All SMC30J48A units undergo pre-shipment inspection (PSI). If there is an issue with SMC30J48A, 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 SMC30J48A part is unused and in its original packaging.
Return procedure for SMC30J48A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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