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Vishay General Semiconductor - Diodes Division SMCJ170AHE3/9AT
- Part No.:
- SMCJ170AHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ170AHE3/9AT.pdf
- Description:
- TVS DIODE 170VWM 275VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,652
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Product details
Overview
SMCJ170AHE3/9AT from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection with 170 V standoff voltage (VWM), 189–209 V breakdown voltage (VBR), and 275 V clamping voltage (VC) at 5.5 A peak pulse current (IPPM). It delivers 1500 W peak pulse power (10/1000 µs waveform) and is AEC-Q101 qualified for automotive-grade reliability in power rail and signal line protection.
For engineers reviewing the SMCJ170AHE3/9AT datasheet, SMCJ170AHE3/9AT pinout, SMCJ170AHE3/9AT application, or SMCJ170AHE3/9AT equivalent, this device is selected for robust overvoltage protection where fast response (<1 ns), low clamping ratio (VC/VBR ≈ 1.46), and stable thermal performance (RθJA = 75 °C/W) are critical in automotive ECUs, industrial power supplies, and sensor interface circuits.
Technical Context
The SMCJ170AHE3/9AT uses a glass-passivated silicon junction to achieve sub-nanosecond response to transients and low incremental surge resistance. Its unidirectional polarity-marked by a cathode band-enables precise placement in DC-biased lines while maintaining bidirectional surge immunity via reverse avalanche conduction.
Rated for -55 °C to +150 °C operating junction temperature and compliant with J-STD-020 MSL Level 1 (260 °C reflow peak), it supports automated SMT assembly and meets UL 497B recognition (QVGQ2) for telecom and industrial protectors. The 1500 W PPPM rating is validated on 8.0 mm × 8.0 mm copper pads per terminal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 170 V - Maximum continuous reverse working voltage before clamping begins; defines safe DC operating margin. |
| VBR (Breakdown Voltage) | 189–209 V at IT = 1.0 mA - Voltage range at which avalanche conduction initiates; ensures predictable turn-on under surge. |
| VC (Clamping Voltage) | 275 V at IPPM = 5.5 A - Peak voltage seen by protected circuit during 10/1000 µs surge; determines downstream component stress. |
| PPPM (Peak Pulse Power) | 1500 W - Energy-handling capacity for standardized 10/1000 µs transient; enables IEC 61000-4-5 Level 4 compliance. |
| TJ max. | +150 °C - Maximum junction temperature; supports operation in under-hood automotive environments. |
| RθJA | 75 °C/W - Thermal resistance junction-to-ambient on standard PCB layout; informs heatsinking requirements for sustained surge duty. |
| Package | SMC (DO-214AB) - Surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; optimized for automated placement and board space efficiency. |
Pinout & Package
SMCJ170AHE3/9AT is housed in an SMC (DO-214AB) package with two terminals: anode and cathode. Polarity is indicated by a molded cathode band on the body. The device mounts directly to PCB copper pads (minimum 8.0 mm × 8.0 mm per terminal) for optimal thermal and surge-current handling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Positive terminal in forward bias; connected to ground or low-side reference in unidirectional TVS configuration | Completes current path during reverse transient clamping; must be routed to lowest-impedance ground plane. |
| Cathode | Negative terminal; marked by band; connects to protected line (e.g., 12 V rail or signal trace) | Defines directionality: clamps when cathode voltage exceeds anode by >VBR; placement determines protected node location. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control units and ADAS sensors, ensuring reliability across temperature cycling and mechanical shock. |
| 1500 W peak pulse power | Withstands IEC 61000-4-5 combination wave surges up to 4 kV (open-circuit)/2 kA (short-circuit) without degradation. |
| Low clamping ratio (VC/VBR ≈ 1.46) | Minimizes overvoltage overshoot during clamping, reducing stress on downstream MOSFETs, MCUs, and analog front-ends. |
| MSL Level 1 moisture sensitivity | Enables standard reflow soldering without baking; compatible with high-volume SMT production lines. |
| UL 497B recognition (QVGQ2) | Meets safety standards for telecom and industrial protector classification, supporting regulatory certification of end equipment. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V supply rails in engine control modules against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery input and DC-DC converter input stage. Use Value: Clamps transients to ≤275 V within <1 ns, preventing damage to LDOs and microcontrollers rated for 36 V absolute maximum. |
Use Scenario: Safeguarding analog outputs (e.g., 4–20 mA loops) and digital I/O (CAN, LIN) in factory automation sensors. IC Role / Device Role / Timing Role: Point-of-entry TVS on sensor PCB edge connector, shunting ESD and inductive switching noise. Use Value: Limits induced voltage to <275 V during 8 kV contact ESD (IEC 61000-4-2), preserving ADC accuracy and communication integrity. |
| Telecom Line Card Surge Suppression | Consumer Power Adapter Input Protection |
Use Scenario: Front-end protection for PoE-powered Ethernet switches and DSLAM line cards exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary TVS on AC/DC rectifier output or DC distribution bus feeding PHY ICs. Use Value: Absorbs 1500 W surge energy (10/1000 µs) without failure, enabling compliance with GR-1089-CORE and ITU-T K.21. |
Use Scenario: Secondary-side overvoltage clamp in USB-C PD adapters and wireless charging base stations. IC Role / Device Role / Timing Role: Standoff-rated TVS on 20 V output rail to prevent catastrophic failure during output short-circuit recovery. Use Value: Maintains 170 V VWM margin above nominal 20 V output, allowing safe operation during normal regulation while clamping fault conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ170A-E3/61T | Lower PPPM (400 W), SMA package (smaller footprint, higher RθJA = 110 °C/W), same VWM/VBR/VC ratings | Restricted to lower-energy transients (e.g., IEC 61000-4-2 ESD only); unsuitable for IEC 61000-4-5 surge | Select when board space is constrained and surge energy is limited to ≤400 W. |
| SMCJ170CAHE3/9AT | Bidirectional variant with identical VWM/VBR/VC ratings but symmetrical clamping in both polarities | Required for AC-coupled or floating signal lines (e.g., RS-485, CAN bus) where polarity reversal occurs | Choose for bidirectional protection needs; not interchangeable without circuit review due to polarity architecture. |
Compared with SMAJ170A-E3/61T, SMCJ170AHE3/9AT provides 275 % higher surge energy handling and superior thermal dissipation; versus SMCJ170CAHE3/9AT, it offers lower cost and simpler layout for DC-biased rails but lacks AC symmetry.
Availability
SMCJ170AHE3/9AT is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor systems, and telecom infrastructure requiring stable component supply with AEC-Q101 assurance and long-term lifecycle support.
Supply support for SMCJ170AHE3/9AT 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, and protection devices with emphasis on reliability, power handling, and automotive qualification.
The SMCJ series was developed for high-power transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where robustness against repetitive surges and extended temperature operation are mandatory.
FAQ
What is the clamping voltage of the SMCJ170AHE3/9AT at its rated peak pulse current?
The SMCJ170AHE3/9AT has a maximum clamping voltage (VC) of 275 V when subjected to its rated peak pulse current (IPPM) of 5.5 A under the standard 10/1000 µs waveform. This value is measured with the device mounted on 8.0 mm × 8.0 mm copper pads per terminal and reflects the worst-case voltage imposed on the protected circuit during surge events. The SMCJ170AHE3/9AT maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C).
Is the SMCJ170AHE3/9AT suitable for automotive applications?
Yes, the SMCJ170AHE3/9AT is AEC-Q101 qualified and explicitly designated for automotive use with the "HE3" suffix. It meets stringent requirements for temperature cycling, mechanical shock, and surge endurance, making it appropriate for engine control units, body electronics, and ADAS sensor modules. The SMCJ170AHE3/9AT also carries UL 497B recognition (QVGQ2), further validating its suitability for safety-critical vehicle subsystems.
How does the SMCJ170AHE3/9AT differ from the bidirectional SMCJ170CAHE3/9AT?
The SMCJ170AHE3/9AT is unidirectional with a cathode band marking and conducts only in reverse avalanche mode, while the SMCJ170CAHE3/9AT is bidirectional and clamps symmetrically for both polarities. Their VWM (170 V), VBR (189–209 V), and VC (275 V) ratings are identical, but the SMCJ170AHE3/9AT cannot replace the CA version in AC-coupled or floating circuits without redesign. The SMCJ170AHE3/9AT is preferred for DC power rails where polarity is fixed and cost optimization is prioritized.
What is the thermal resistance of the SMCJ170AHE3/9AT, and how does it affect layout?
The SMCJ170AHE3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on the recommended 8.0 mm × 8.0 mm copper pad per terminal. This value assumes no additional heatsinking and dictates minimum copper area needed to maintain TJ ≤ 150 °C during repeated surges. Reducing pad size increases RθJA, risking thermal runaway; therefore, the SMCJ170AHE3/9AT layout must strictly follow Vishay's mounting guidelines to ensure reliability.
Does the SMCJ170AHE3/9AT meet industry surge immunity standards?
Yes, the SMCJ170AHE3/9AT supports compliance with IEC 61000-4-5 (surge immunity) Level 4 (4 kV line-to-earth, 2 kV line-to-line) and IEC 61000-4-2 (ESD) Level 4 (8 kV contact, 15 kV air) when properly applied in circuit. Its 1500 W peak pulse power rating, fast response time (<1 ns), and low clamping ratio enable effective suppression of high-energy transients. The SMCJ170AHE3/9AT is also recognized under UL 497B for telecom protector classification, confirming its suitability for regulated infrastructure equipment.
SMCJ170AHE3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ170AHE3/9AT FAQ
1.How can I place an order for SMCJ170AHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ170AHE3/9AT 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 SMCJ170AHE3/9AT reliable?
The price and inventory of SMCJ170AHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ170AHE3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ170AHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ170AHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ170AHE3/9AT?
SMCJ170AHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ170AHE3/9AT 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 SMCJ170AHE3/9AT?
For technical support, including SMCJ170AHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ170AHE3/9AT requirements.
6.How does Aetrix verify that SMCJ170AHE3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ170AHE3/9AT 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 SMCJ170AHE3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ170AHE3/9AT?
All SMCJ170AHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ170AHE3/9AT, 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 SMCJ170AHE3/9AT part is unused and in its original packaging.
Return procedure for SMCJ170AHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ170AHE3/9AT Tags
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