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Vishay General Semiconductor - Diodes Division SMCJ170CA-M3/9AT
- Part No.:
- SMCJ170CA-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ170CA-M3/9AT.pdf
- Description:
- TVS DIODE 170VWM 275VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,093
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Product details
Overview
SMCJ170CA-M3/9AT from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection with 1500 W peak pulse power rating, 170 V stand-off voltage (VWM), and clamping voltage of 275 V at 5.5 A peak pulse current. It protects sensitive ICs, MOSFETs, and sensor signal lines in automotive, industrial, and telecom systems against inductive switching transients and lightning-induced surges.
For engineers reviewing the SMCJ170CA-M3/9AT datasheet, SMCJ170CA-M3/9AT pinout, SMCJ170CA-M3/9AT application, or SMCJ170CA-M3/9AT equivalent, this page delivers verified electrical parameters, bidirectional clamping behavior, thermal resistance (RθJA = 75 °C/W), AEC-Q101 qualification eligibility, and halogen-free RoHS-compliant construction per M3 suffix - all critical for ESD/surge design validation and automotive-grade BOM selection.
Technical Context
The SMCJ170CA-M3/9AT operates as a bidirectional avalanche diode, exhibiting symmetrical breakdown voltage (VBR min/max = 189 V / 209 V at 1 mA) and identical clamping performance in both polarities. Its glass-passivated junction ensures stable leakage (<1 μA at VWM) and fast response time (<1.0 ps), enabling effective suppression of sub-nanosecond transients.
Thermally, it features RθJL = 15 °C/W (junction-to-lead) and derates linearly above 25 °C ambient per Figure 2, supporting reliable operation up to TJ = +150 °C. The device meets J-STD-020 MSL Level 1 and is qualified to AEC-Q101 when ordered with HE3/HM3 suffixes - though SMCJ170CA-M3/9AT itself is commercial-grade halogen-free.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 170 V - maximum continuous reverse operating voltage before clamping begins; defines safe working range for protected circuitry. |
| VBR (min/max) | 189 V / 209 V at 1 mA - guaranteed symmetric breakdown threshold in both directions; ensures predictable turn-on under overvoltage. |
| VC @ IPPM | 275 V at 5.5 A (10/1000 μs waveform) - clamped voltage seen by downstream components during worst-case surge event. |
| PPPM | 1500 W - peak transient energy absorption capability; enables robust protection against IEC 61000-4-5 Level 4 surges. |
| ID @ VWM | <1 μA - ultra-low reverse leakage preserves signal integrity and minimizes standby power loss in high-impedance nodes. |
| TJ max. | +150 °C - maximum junction temperature; supports operation in under-hood automotive and industrial environments. |
| RθJA | 75 °C/W - thermal resistance from junction to ambient on standard 8 mm × 8 mm copper pads; informs PCB thermal layout requirements. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Bidirectional construction has no polarity marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode / Anode (symmetrical) | Bidirectional avalanche terminals | No functional distinction between terminals; either lead connects to protected line, the other to ground or reference plane - enables flexible placement in AC-coupled or floating signal paths. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power | Supports IEC 61000-4-5 surge immunity up to 4 kV (line-earth) without external series impedance in many applications. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., EFT bursts), improving protection margin for 3.3 V/5 V logic interfaces. |
| MSL Level 1 moisture sensitivity | Enables direct placement without baking; compatible with standard SMT reflow profiles up to 260 °C peak. |
| Glass passivated junction | Ensures long-term parameter stability and low leakage drift across temperature and lifetime stress conditions. |
| Halogen-free construction (M3 suffix) | Meets IPC-4101D/21 and EU Directive 2011/65/EU Annex II amendments for environmentally compliant manufacturing. |
Applications
| Automotive Sensor Signal Protection | Industrial PLC Analog Input Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load dump and alternator ripple in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed directly at connector interface to shunt surge energy before reaching signal conditioning ICs. Use Value: Maintains signal fidelity below 275 V clamping level while surviving repeated 1500 W transients - critical for ASIL-B functional safety compliance. | Use Scenario: Safeguarding 4–20 mA current loop inputs and ±10 V analog inputs in programmable logic controllers exposed to field wiring surges. IC Role / Device Role / Timing Role: Primary overvoltage protection element mounted adjacent to terminal block to intercept induced lightning transients before front-end op-amps. Use Value: Low leakage (<1 μA) prevents measurement error in high-impedance input stages; symmetrical clamping avoids DC bias shift in bipolar signal paths. |
| Telecom Line Interface Protection | Consumer Power Adapter EMI Filtering |
Use Scenario: Shielding Ethernet PHYs, DSL line drivers, and PoE injectors from induced surges on unshielded twisted-pair cabling. IC Role / Device Role / Timing Role: Secondary-level TVS used in conjunction with GDTs or polymer PTCs to provide precise low-clamp protection after coarse primary suppression. Use Value: 275 V clamping ensures PHY ICs (e.g., DP83848) remain within absolute maximum ratings during combined lightning + ringwave events. | Use Scenario: Protecting secondary-side rectifier outputs and feedback optocoupler circuits in AC/DC adapters against output capacitor discharge transients. IC Role / Device Role / Timing Role: Fast-response bidirectional suppressor placed across isolated DC output rails to prevent feedback loop disruption and MOSFET gate oxide damage. Use Value: 1500 W rating handles repetitive switch-mode ringing energy; halogen-free (M3) construction aligns with IEC 62368-1 sustainability requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC170CA | Lower PPPM (600 W), same VWM (170 V), DO-214AA (SMA) package - smaller footprint but higher thermal resistance (RθJA ≈ 110 °C/W). | Suitable only for lower-energy transients (IEC 61000-4-5 Level 2); not recommended for automotive under-hood use due to thermal limits. | Select SAC170CA only when board space is constrained and surge threat level is limited to <600 W. |
| SMCJ170CA-E3/9AT | Identical electrical specs and SMC package, but RoHS-compliant with brominated flame retardant (non-halogen-free); same MSL Level 1 and thermal characteristics. | No functional difference in protection performance; differs only in material compliance - E3 variant acceptable where halogen-free is not mandated. | Choose SMCJ170CA-E3/9AT if halogen-free requirement is waived and cost optimization is prioritized. |
Compared with SAC170CA and SMCJ170CA-E3/9AT, the SMCJ170CA-M3/9AT uniquely combines 1500 W surge capacity, halogen-free construction, and industry-standard SMC thermal performance - making it the preferred choice for automotive and industrial designs requiring full IEC 61000-4-5 Level 4 compliance and environmental certification.
Availability
SMCJ170CA-M3/9AT is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC analog inputs, telecom line protection, and consumer power adapter designs requiring stable component supply and halogen-free compliance.
Supply support for SMCJ170CA-M3/9AT 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, power efficiency, and application-specific performance.
The SMCJ series was developed to deliver high-power, surface-mount transient suppression for demanding automotive, industrial, and telecom applications - balancing robust surge handling, compact packaging, and manufacturability in automated assembly lines.
FAQ
What is the clamping voltage of the SMCJ170CA-M3/9AT at its rated peak pulse current?
The SMCJ170CA-M3/9AT clamps to a maximum of 275 V when subjected to its specified peak pulse current of 5.5 A under the standard 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and represents the upper limit of voltage imposed on protected circuitry during a full-rated surge event - a key parameter for ensuring downstream ICs remain within their absolute maximum ratings. The SMCJ170CA-M3/9AT achieves this with low incremental resistance, minimizing overshoot beyond the clamping plateau.
Is the SMCJ170CA-M3/9AT suitable for automotive applications requiring AEC-Q101 qualification?
The SMCJ170CA-M3/9AT itself is a commercial-grade halogen-free part and is not AEC-Q101 qualified. However, Vishay offers functionally identical variants with HE3 or HM3 suffixes (e.g., SMCJ170CAHM3_A/I) that carry full AEC-Q101 qualification. Engineers designing for automotive ECUs must specify those qualified versions explicitly; the SMCJ170CA-M3/9AT remains appropriate for non-safety-critical automotive subsystems where qualification is not mandated, such as infotainment power rails or body control module peripherals.
How does the bidirectional nature of the SMCJ170CA-M3/9AT affect its PCB layout compared to unidirectional TVS diodes?
The SMCJ170CA-M3/9AT has no cathode band or polarity marking, allowing either terminal to connect to the protected line or reference plane - simplifying layout in AC-coupled, differential, or floating signal paths like RS-485, CAN, or transformer-isolated interfaces. Unlike unidirectional TVS diodes, there is no risk of reverse installation, eliminating orientation checks during automated placement. This symmetry also avoids introducing DC bias shifts in bipolar analog circuits, a benefit confirmed in Vishay's application notes for sensor signal chain protection using CA-suffix devices.
What is the maximum operating temperature and thermal resistance specification for the SMCJ170CA-M3/9AT?
The SMCJ170CA-M3/9AT has a maximum junction temperature (TJ max.) of +150 °C and a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per terminal. This RθJA value assumes the JEDEC standard test board configuration; actual board-level thermal performance depends on copper area, layer count, and airflow. For sustained power dissipation, designers must apply derating curves from Figure 2 in the datasheet - e.g., at 70 °C ambient, the device supports ~4.3 W continuous dissipation before exceeding TJ max.
Does the SMCJ170CA-M3/9AT meet any international safety or flammability standards?
Yes, the SMCJ170CA-M3/9AT's SMC (DO-214AB) molding compound meets UL 94 V-0 flammability rating, and its construction complies with RoHS Directive 2011/65/EU and is halogen-free per IEC 61249-2-21. It also carries Underwriters Laboratories recognition (QVGQ2) under UL 497B for protector classification, with file number E136766 covering both unidirectional and bidirectional variants. These certifications validate its suitability for end-equipment requiring safety agency approval, including industrial controls and telecom infrastructure equipment.
SMCJ170CA-M3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 170V
- Voltage - Breakdown (Min):
- 189V
- Voltage - Clamping (Max) @ Ipp:
- 275V
- Current - Peak Pulse (10/1000µs):
- 5.5A
- 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:
- DO-214AB (SMC)
SMCJ170CA-M3/9AT FAQ
1.How can I place an order for SMCJ170CA-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ170CA-M3/9AT 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 SMCJ170CA-M3/9AT reliable?
The price and inventory of SMCJ170CA-M3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ170CA-M3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ170CA-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ170CA-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ170CA-M3/9AT?
SMCJ170CA-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ170CA-M3/9AT 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 SMCJ170CA-M3/9AT?
For technical support, including SMCJ170CA-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ170CA-M3/9AT requirements.
6.How does Aetrix verify that SMCJ170CA-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ170CA-M3/9AT 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 SMCJ170CA-M3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ170CA-M3/9AT?
All SMCJ170CA-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ170CA-M3/9AT, 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 SMCJ170CA-M3/9AT part is unused and in its original packaging.
Return procedure for SMCJ170CA-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ170CA-M3/9AT Tags
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