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STMicroelectronics SMC30J8.5CA
- Part No.:
- SMC30J8.5CA
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC30J8.5CA.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:3,801
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Product details
Overview
SMC30J8.5CA from STMicroelectronics is a bidirectional transient voltage suppression (TVS) diode designed for high-energy ESD and surge protection in power and signal lines. It delivers 3000 W peak pulse power (10/1000 µs), clamps at 14.4 V (max) under 1 A test current, and features low leakage (10 µA at VRM = 8.5 V, 25 °C), 175 °C max junction temperature, and JEDEC-standard SMC package - used in industrial power supplies, automotive body control modules, and PoE-powered devices.
For engineers reviewing the SMC30J8.5CA datasheet, SMC30J8.5CA pinout, SMC30J8.5CA application, or SMC30J8.5CA equivalent, key selection criteria include bidirectional clamping behavior, 8.5 V standoff voltage, dynamic resistance of 6.33 mΩ, IEC 61000-4-2 ±30 kV contact/air discharge compliance, and compatibility with reflow soldering per J-STD-020 MSL Level 1.
Technical Context
This TVS diode employs planar silicon avalanche technology to achieve precise breakdown voltage control and stable clamping performance across temperature. Its bidirectional configuration enables symmetric protection on AC-coupled or floating signal paths without polarity constraints.
It operates over -55 °C to +175 °C junction temperature range and maintains low dynamic resistance (6.33 mΩ) to minimize voltage overshoot during fast transients like IEC 61000-4-4 level 4 (4 kV), while sustaining 10 µA leakage at 8.5 V reverse bias - critical for low-power sensor interfaces and always-on circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 8.5 V - maximum continuous reverse operating voltage before significant leakage begins |
| Breakdown Voltage (VBR min) | 9.5 V at 1 mA - ensures reliable triggering above normal operating voltage margins |
| Clamping Voltage (VCL max) | 14.4 V at 208 A (10/1000 µs) - limits downstream voltage stress during surge events |
| Peak Pulse Power (PPP) | 3000 W (10/1000 µs) - supports robust protection against lightning-induced surges in industrial equipment |
| Leakage Current (IRM) | 10 µA at 8.5 V, 25 °C - enables use in battery-backed or ultra-low-power monitoring circuits |
| Operating Junction Temp | -55 °C to +175 °C - allows deployment in under-hood automotive or high-temperature industrial enclosures |
| ESD Rating | ±30 kV contact & air discharge (IEC 61000-4-2) - exceeds level 4 for rugged human-interface port protection |
Pinout & Package
The SMC30J8.5CA is housed in a JEDEC-standard SMC (DO-214AB) surface-mount package with matte tin-plated leads, footprint-compatible with IPC7531 recommendations and optimized for thermal dissipation on FR4 PCBs with 70 µm copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (K) | Transient current sink (bidirectional) | Acts as common terminal for both polarities - connects to protected line; no fixed anode/cathode orientation |
| Anode (A) | Transient current sink (bidirectional) | Second terminal forming symmetrical clamping path; interchangeable with K in layout due to bidirectional symmetry |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses (e.g., RS-485), and floating power rails without polarity concerns |
| Low dynamic resistance (RD) | 6.33 mΩ minimizes clamping voltage rise under high-current transients, improving system-level surge margin |
| High-temperature operation | 175 °C max junction rating supports placement near heat-generating components (e.g., MOSFETs, transformers) in compact power designs |
| JEDEC-registered SMC package | Ensures mechanical interoperability with automated assembly lines and proven thermal performance on standard PCB footprints |
| UL94 V0 flammability rating | Confirms polymer housing meets stringent fire-safety requirements for industrial and transportation end equipment |
Applications
| Industrial Power Supply Inputs | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of 12 V DC input rails against load dump and jump-start transients in DIN-rail mounted PLC power supplies. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed upstream of input filter capacitors and DC-DC converters. Use Value: Limits voltage excursion to ≤14.4 V during 208 A surges, preventing damage to upstream rectifiers and downstream regulators. |
Use Scenario: ESD protection on LIN bus lines connecting door modules, seat controllers, and lighting nodes. IC Role / Device Role / Timing Role: Fast-response surge suppressor on bidirectional LIN physical layer, co-located with connector interface. Use Value: Withstands ±30 kV contact discharge without degradation, maintaining bus integrity during service technician handling. |
| PoE-Powered Devices | Smart Sensor Signal Conditioning |
Use Scenario: Protection of 48 V DC power pairs in IEEE 802.3af/at PD circuitry (e.g., IP cameras, VoIP phones). IC Role / Device Role / Timing Role: Primary surge clamp on PSE-side power delivery lines, rated for 3000 W 10/1000 µs pulses. Use Value: Clamps induced surges from cable coupling below 14.4 V, preserving isolation barrier integrity and secondary-side LDOs. |
Use Scenario: Input protection for 4–20 mA analog sensor transmitters exposed to field wiring ESD in process automation. IC Role / Device Role / Timing Role: Low-leakage (10 µA) bidirectional clamp on current-loop input terminals. Use Value: Prevents false tripping of current-sense amplifiers during ±30 kV ESD events while adding negligible offset error. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ8.5CA (STMicroelectronics) | Lower PPP (600 W), same VRM/VBR, SMB package (smaller footprint, reduced thermal mass) | Suitable for space-constrained consumer electronics where 3000 W surge immunity is not required | Select when board area is limited and peak surge energy remains below 600 W |
| SAC30J8.5CA (Littelfuse) | Identical PPP (3000 W), same VRM/VBR, but higher leakage (25 µA vs. 10 µA) and 150 °C Tj max | Acceptable for non-battery-powered industrial systems where leakage sensitivity is low | Choose only if supply chain diversification is prioritized over leakage and temperature margin |
Compared with SMC30J8.5CA, SMBJ8.5CA trades surge robustness for compactness, while SAC30J8.5CA matches power rating but sacrifices leakage performance and thermal endurance - making SMC30J8.5CA optimal for high-reliability, thermally demanding, or low-power-critical deployments.
Availability
SMC30J8.5CA is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, PoE-powered devices, and smart sensor interfaces requiring stable component supply across extended product lifecycles.
Supply support for SMC30J8.5CA 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 electromagnetic immunity in harsh environments - emphasizing low leakage, high-temperature stability, and JEDEC-compliant manufacturability.
FAQ
What is the difference between SMC30J8.5A and SMC30J8.5CA?
The "A" suffix denotes unidirectional TVS behavior (anode-to-cathode conduction only), while "CA" indicates bidirectional operation (symmetric clamping in both polarities). SMC30J8.5CA is used on AC-coupled or floating lines like RS-485, LIN, or PoE power pairs, whereas the "A" version suits DC rail protection with defined polarity.
Can SMC30J8.5CA be used in parallel for higher surge current handling?
No - paralleling TVS diodes without matched VBR and RD causes current imbalance and premature failure. ST does not recommend parallel operation. For higher current capability, select a higher-voltage-rated part with lower clamping voltage or use a discrete crowbar circuit with external triggering.
Is SMC30J8.5CA compliant with AEC-Q200 for automotive use?
SMC30J8.5CA is not AEC-Q200 qualified. While it meets IEC 61000-4-2/4-4 and operates up to 175 °C, ST offers the SMAJ8.5CA-Q and SMBJ8.5CA-Q variants for automotive applications with full AEC-Q200 qualification and PPAP documentation.
What is the recommended PCB footprint for thermal reliability?
Use the IPC7531-compliant SMC footprint with ≥1.54 mm pad width, 5.11 mm center-to-center spacing, and ≥3.14 mm copper area per pad. ST recommends ≥2 cm² total copper pour under the device to maintain Rth(j-a) < 100 °C/W and sustain 3000 W pulse capability per datasheet Figure 12.
SMC30J8.5CA 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):
- 8.5V
- Voltage - Breakdown (Min):
- 9.4V
- Voltage - Clamping (Max) @ Ipp:
- 14.4V
- Current - Peak Pulse (10/1000µs):
- 208A
- 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
SMC30J8.5CA FAQ
1.How can I place an order for SMC30J8.5CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC30J8.5CA 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 SMC30J8.5CA reliable?
The price and inventory of SMC30J8.5CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC30J8.5CA is usually 5 days.
3.What payment methods are accepted for SMC30J8.5CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC30J8.5CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC30J8.5CA?
SMC30J8.5CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC30J8.5CA 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 SMC30J8.5CA?
For technical support, including SMC30J8.5CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC30J8.5CA requirements.
6.How does Aetrix verify that SMC30J8.5CA is sourced from the original manufacturer or authorized distributors?
All SMC30J8.5CA 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 SMC30J8.5CA meets industry standards.
7.What is the process for return or replacement of SMC30J8.5CA?
All SMC30J8.5CA units undergo pre-shipment inspection (PSI). If there is an issue with SMC30J8.5CA, 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 SMC30J8.5CA part is unused and in its original packaging.
Return procedure for SMC30J8.5CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC30J8.5CA Tags
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