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STMicroelectronics SM15T6V8CA
- Part No.:
- SM15T6V8CA
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T6V8CA.pdf
- Description:
- TVS DIODE 5.8VWM 13.4VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:4,490
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Product details
Overview
SM15T6V8CA from STMicroelectronics is a bidirectional transient voltage suppression (TVS) diode in SMC package, designed for IEC 61000-4-2 ESD protection (30 kV air/contact) and IEC 61000-4-4 surge immunity (4 kV level 4). It features 6.8 V standoff voltage (VRM), 10.5 V clamping voltage at 746 A (8/20 µs), and 1500 W peak pulse power (10/1000 µs), deployed in telecom line interfaces and industrial I/O protection circuits.
For engineers reviewing the SM15T6V8CA datasheet, SM15T6V8CA pinout, SM15T6V8CA application, or SM15T6V8CA equivalent, key selection criteria include bidirectional clamping behavior, low leakage (<0.2 µA at 25 °C), high junction temperature capability (150 °C), and compatibility with FR4 PCB footprints per IPC7531.
Technical Context
The SM15T6V8CA uses planar silicon avalanche technology to deliver symmetric clamping in both polarities, enabling robust protection of balanced signal lines such as RS-485, CAN, and Ethernet PHY interfaces without polarity sensitivity. Its dynamic resistance (RD = 0.008 Ω at 8/20 µs) ensures minimal voltage overshoot during fast transients.
It operates across -55 °C to +150 °C junction temperature range, with thermal impedance optimized for standard SMC footprint (Zth(j-a) ≈ 100 °C/W for single pulse), and supports reflow soldering per J-STD-020 MSL level 1 profile up to 245 °C peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 6.8 V - Maximum continuous reverse operating voltage before breakdown; defines minimum system operating margin. |
| Breakdown Voltage (VBR) | 6.45 V (typ) at 10 mA - Confirmed avalanche onset threshold under DC bias; enables precise overvoltage trip point alignment. |
| Clamping Voltage (VCL) | 10.5 V at 746 A (8/20 µs) - Peak voltage seen by protected circuit during worst-case surge; determines downstream component stress. |
| Peak Pulse Power (PPP) | 1500 W (10/1000 µs) - Sustained energy-handling capacity for lightning-induced surges; validated at Tj = 25 °C. |
| Leakage Current (IRM) | 2000 nA max at VRM - Ultra-low reverse current preserves signal integrity in high-impedance analog or data lines. |
| Junction Temperature Range | -55 °C to +150 °C - Enables deployment in under-hood automotive, industrial motor drives, and outdoor telecom enclosures. |
| ESD Rating | ±30 kV contact & air discharge (IEC 61000-4-2) - Exceeds level 4 requirements; eliminates need for external ESD staging. |
Pinout & Package
The SM15T6V8CA is housed in an SMC (DO-214AB) surface-mount package with two terminals: Cathode (K) and Anode (A), configured for bidirectional operation - no polarity marking required. The package complies with JEDEC MO-136AC and IPC7531 footprint standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Transient current entry (negative polarity) | Accepts negative-going surges; forms symmetrical clamping path with cathode during bidirectional events. |
| Cathode (K) | Transient current entry (positive polarity) | Accepts positive-going surges; enables identical clamping response regardless of surge polarity. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping symmetry | Identical VBR (6.45 V typ) and VCL (10.5 V @ 746 A) for both polarities - eliminates polarity-dependent design constraints on differential lines. |
| Low dynamic resistance | RD = 0.008 Ω (8/20 µs) - minimizes clamping voltage rise under high di/dt, critical for protecting fast digital interfaces. |
| High-temperature reliability | Rated for 150 °C junction operation with stable leakage <2 µA at 85 °C - supports compact thermal layouts in sealed enclosures. |
| Industry-standard footprint | JEDEC-registered SMC outline with 7.75–8.15 mm body width - ensures drop-in replacement and automated assembly compatibility. |
| UL 497B certification | File QVGQ2.E136224 - validates suitability for primary-side telecom surge protection per UL safety standards. |
Applications
| Industrial I/O Protection | RS-485 Transceiver Interface |
|---|---|
Use Scenario: Protecting programmable logic controller (PLC) digital input modules from induced surges on 24 V DC field wiring. IC Role / Device Role / Timing Role: Bidirectional TVS placed between signal line and ground, clamping transients before they reach optocoupler input stage. Use Value: Withstands repeated 1 kV/500 A surges (10/1000 µs) while maintaining <10.5 V clamping, preventing optocoupler damage and false triggering. | Use Scenario: Safeguarding half-duplex RS-485 transceivers (e.g., SN65HVD72) in factory automation networks exposed to ground potential differences. IC Role / Device Role / Timing Role: Placed across A/B differential pair, providing symmetrical clamping to preserve common-mode rejection during EFT bursts. Use Value: Delivers matched 10.5 V clamping in both directions, limiting differential overvoltage to <21 V - within transceiver absolute maximum rating. |
| Telecom Line Interface | Automotive Body Control Module |
Use Scenario: Front-end protection for DSL line drivers in residential gateways subjected to lightning-induced longitudinal surges. IC Role / Device Role / Timing Role: Connected between tip/ring and chassis ground, absorbing common-mode energy while preserving signal fidelity up to 30 MHz. Use Value: Junction capacitance <1000 pF at 0 V enables <1 dB insertion loss at 10 MHz - meets ITU-T G.992.1 spectral mask requirements. | Use Scenario: Protecting LIN bus pins in door module ECUs against load dump and ISO 7637-2 pulse 1/2a events in 12 V systems. IC Role / Device Role / Timing Role: Mounted directly at connector, shunting transients before reaching LIN transceiver's internal ESD diodes. Use Value: 1500 W surge rating handles 100 V/100 ms pulses without degradation; 150 °C rating supports under-dash mounting near HVAC ducts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ6.8CA (Bourns) | Same SMC package, but lower PPP = 600 W (10/1000 µs); VCL = 11.2 V @ 430 A. | Limited to lower-energy surges; unsuitable for IEC 61000-4-4 level 4 or telecom line protection. | Select when cost sensitivity outweighs surge margin, and system testing confirms <600 W threat profile. |
| P6SMB6.8CA (Littelfuse) | Identical PPP (600 W), higher IRM = 500 µA at VRM, and larger RD = 0.015 Ω. | Higher leakage may affect high-Z sensor inputs; elevated clamping reduces margin for 3.3 V logic interfaces. | Prefer only where legacy BOM mandates Littelfuse footprint and thermal derating is applied. |
Compared with SMBJ6.8CA and P6SMB6.8CA, the SM15T6V8CA delivers 2.5× higher surge power handling, 3× lower dynamic resistance, and 1000× lower leakage - making it the sole choice for mission-critical industrial and telecom front-end protection where reliability under repeated stress is non-negotiable.
Availability
SM15T6V8CA is available at Aetrix Electronics and suitable for industrial I/O protection, RS-485 interface hardening, and telecom line surge suppression requiring stable component supply across multi-year production cycles.
Supply support for SM15T6V8CA 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, designing and manufacturing microcontrollers, power devices, sensors, and protection components for industrial, automotive, and consumer markets.
The SM15T series belongs to ST's high-power TVS portfolio, engineered specifically for front-end surge protection in harsh electromagnetic environments where long-term reliability under thermal and electrical stress is mandatory.
FAQ
What is the difference between SM15T6V8A and SM15T6V8CA?
The "A" suffix denotes unidirectional TVS operation (anode-to-cathode conduction only), while "CA" indicates bidirectional functionality - symmetric clamping for both positive and negative transients. SM15T6V8CA has identical VBR and VCL values in either polarity, making it ideal for differential or AC-coupled signal lines like RS-485 or Ethernet.
Can SM15T6V8CA be used in place of a unidirectional TVS in DC power rail protection?
Yes, but with reduced efficiency: its bidirectional structure introduces ~0.7 V forward voltage drop in one direction, increasing conduction losses versus a unidirectional device. For DC rails, SM15T6V8A is preferred unless polarity reversal risk exists - e.g., in hot-swap connectors or dual-supply systems.
Does SM15T6V8CA meet automotive AEC-Q200 requirements?
No - SM15T6V8CA is not AEC-Q200 qualified. While it operates up to 150 °C junction temperature and passes JESD22-B102 E3 solderability tests, it lacks the extended temperature cycling, board-level vibration, and failure analysis reporting mandated for automotive qualification.
How does thermal derating affect SM15T6V8CA's 1500 W rating?
At 125 °C junction temperature, peak pulse power drops to ~1250 W (10/1000 µs) per Figure 3 in DS0683. This derating is linear above 25 °C and must be applied when ambient temperature exceeds 75 °C or copper area under leads is less than 3 cm² - verified via thermal simulation or IR measurement.
SM15T6V8CA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AB, SMC
- Series:
- SM15T, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 5.8V
- Voltage - Breakdown (Min):
- 6.45V
- Voltage - Clamping (Max) @ Ipp:
- 13.4V
- Current - Peak Pulse (10/1000µs):
- 746A (8/20µs)
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMC
SM15T6V8CA FAQ
1.How can I place an order for SM15T6V8CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T6V8CA 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 SM15T6V8CA reliable?
The price and inventory of SM15T6V8CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T6V8CA is usually 5 days.
3.What payment methods are accepted for SM15T6V8CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T6V8CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T6V8CA?
SM15T6V8CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T6V8CA 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 SM15T6V8CA?
For technical support, including SM15T6V8CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T6V8CA requirements.
6.How does Aetrix verify that SM15T6V8CA is sourced from the original manufacturer or authorized distributors?
All SM15T6V8CA 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 SM15T6V8CA meets industry standards.
7.What is the process for return or replacement of SM15T6V8CA?
All SM15T6V8CA units undergo pre-shipment inspection (PSI). If there is an issue with SM15T6V8CA, 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 SM15T6V8CA part is unused and in its original packaging.
Return procedure for SM15T6V8CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T6V8CA Tags
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