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Vishay General Semiconductor - Diodes Division SMCJ170AHE3/57T
- Part No.:
- SMCJ170AHE3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ170AHE3/57T.pdf
- Description:
- TVS DIODE 170VWM 275VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,417
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Product details
Overview
SMCJ170AHE3/57T 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 range (VBR), and 1500 W peak pulse power (10/1000 μs). It clamps transients to ≤275 V at 5.5 A peak pulse current and operates across –55 °C to +150 °C junction temperature.
For engineers reviewing the SMCJ170AHE3/57T datasheet, SMCJ170AHE3/57T pinout, SMCJ170AHE3/57T application, or SMCJ170AHE3/57T equivalent, this device serves as a robust, AEC-Q101-qualified overvoltage protector for automotive power rails, industrial sensor interfaces, and DC bus lines where fast response (<1 ns), low clamping ratio, and stable thermal performance under repetitive surges are critical.
Technical Context
The SMCJ170AHE3/57T employs a glass-passivated silicon junction optimized for low incremental surge resistance and sub-nanosecond response to ESD and lightning-induced transients. Its unidirectional polarity-marked by a cathode band-enables precise placement in DC-biased circuits without reverse conduction during normal operation.
Rated for 1500 W peak pulse power (10/1000 μs), it delivers 275 V clamping voltage at 5.5 A IPPM while maintaining <1.0 μA leakage at 170 V standoff. Thermal resistance is 75 °C/W (junction-to-ambient) on standard 8.0 mm × 8.0 mm copper pads, supporting reliable operation up to 150 °C TJ max.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 170 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC bias margin. |
| VBR (min/max) | 189 V / 209 V at 1.0 mA - Confirmed breakdown threshold range; ensures predictable turn-on under surge conditions. |
| VC @ IPPM | 275 V at 5.5 A - Clamped voltage during 10/1000 μs surge; determines maximum stress on downstream ICs. |
| PPPM | 1500 W - Peak pulse power handling capacity; enables protection against IEC 61000-4-5 Level 4 surges. |
| ID @ VWM | ≤1.0 μA - Reverse leakage at rated standoff; minimizes standby power loss in high-impedance circuits. |
| TJ max. | +150 °C - Maximum junction temperature; supports under-hood automotive and industrial ambient environments. |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance on recommended pad layout; informs heatsinking requirements. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, matte tin-plated leads, RoHS-compliant and AEC-Q101 qualified. Cathode indicated by molded band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry (unidirectional) | Connected to system ground or low-side return path; conducts during forward surge events. |
| Cathode | Reverse-biased terminal (marked) | Connected to protected line (e.g., 12 V rail); initiates clamping when voltage exceeds VWM. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance per JESD22-A108. |
| Low clamping ratio (VC/VBR) | ~1.38 - Enables tighter voltage margins for 170 V-rated systems without overdesigning downstream components. |
| Fast response time | <1 ns - Limits voltage overshoot during ESD (IEC 61000-4-2) and fast-rising transients. |
| MSL Level 1 rating | Reflow-compatible up to 260 °C peak - Supports standard lead-free assembly without moisture sensitivity concerns. |
| Glass passivated junction | Enhanced stability and reduced parameter drift over lifetime vs. epoxy-passivated alternatives. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface |
|---|---|
Use Scenario: Protecting 12 V/24 V battery-fed ECUs, body control modules, and lighting drivers from load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power input and ground, clamping surges before they reach LDOs or microcontrollers. Use Value: Withstands 1500 W pulses and maintains ≤275 V clamping, preventing latch-up or permanent damage in AEC-Q100 Grade 2 systems. | Use Scenario: Safeguarding analog front-ends of pressure, temperature, or position sensors connected to long harnesses in factory automation. IC Role / Device Role / Timing Role: Bidirectional-capable design (via family variant) or unidirectional placement on supply line to absorb coupled noise from motor drives or solenoids. Use Value: 1.0 μA leakage at 170 V ensures minimal signal offset error in precision 4–20 mA loops or ratiometric bridge sensors. |
| DC Bus Surge Suppression | Telecom Power Input Stage |
Use Scenario: Front-end protection for 170 V nominal DC bus in solar inverters, UPS systems, and industrial SMPS. IC Role / Device Role / Timing Role: Parallel-connected TVS absorbing line-to-ground surges induced by grid switching or nearby lightning strikes. Use Value: 75 °C/W RθJA allows thermal management on standard PCB copper, avoiding costly heatsinks in space-constrained enclosures. | Use Scenario: Secondary-side overvoltage clamp on 48 V telecom rectifier outputs feeding PoE injectors or baseband processors. IC Role / Device Role / Timing Role: Standoff voltage matched to system nominal (170 V variant used in higher-tier 120 VAC-derived supplies), limiting transient propagation to sensitive PHY layers. Use Value: AEC-Q101 qualification and 150 °C TJ max ensure longevity in sealed, fanless telecom cabinets with elevated ambient temperatures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ170A-E3/61 | Lower PPPM (400 W), same VWM/VBR, SMA package (smaller footprint, higher RθJA = 110 °C/W) | Suitable only for lower-energy transients (e.g., IEC 61000-4-2 ESD), not IEC 61000-4-5 surges | Select when board space is constrained and surge energy is limited to ≤400 W. |
| SMCJ170CAHE3/57T | Bidirectional variant; identical VWM, VBR, PPPM, and package; symmetrical clamping in both polarities | Required for AC-coupled or floating signal lines (e.g., RS-485, CAN FD) where polarity reversal occurs | Choose for bidirectional protection needs; otherwise, unidirectional SMCJ170AHE3/57T offers lower leakage and simpler biasing. |
Compared with SMAJ170A-E3/61 and SMCJ170CAHE3/57T, the SMCJ170AHE3/57T uniquely balances 1500 W surge capability, automotive qualification, and unidirectional efficiency-making it optimal for high-reliability DC power rail protection where energy levels exceed 400 W and polarity is fixed.
Availability
SMCJ170AHE3/57T is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor systems, DC power distribution networks, and telecom infrastructure requiring stable component supply and long-term lifecycle support.
Supply support for SMCJ170AHE3/57T 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 automotive qualification.
The SMCJ series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where robustness against load dump, ESD, and lightning-induced surges is mandatory.
FAQ
What is the clamping voltage of the SMCJ170AHE3/57T at its rated peak pulse current?
The SMCJ170AHE3/57T clamps to a maximum of 275 V at its specified peak pulse current of 5.5 A under a 10/1000 μs waveform. This value is measured and guaranteed per Vishay's datasheet (Document Number: 88394, Rev. 09-Jan-2024) and defines the upper voltage limit imposed on protected circuitry during surge events. The clamping performance directly impacts system-level immunity and must be verified against downstream component voltage ratings when designing with the SMCJ170AHE3/57T.
Is the SMCJ170AHE3/57T qualified for automotive applications?
Yes, the SMCJ170AHE3/57T carries AEC-Q101 qualification, confirmed by Vishay's ordering code suffix "HE3", which denotes RoHS-compliant and AEC-Q101-qualified construction. It undergoes rigorous stress testing-including temperature cycling, high-temperature reverse bias, and surge endurance-to meet automotive reliability standards. This makes the SMCJ170AHE3/57T suitable for under-hood and chassis-mounted modules where extended temperature operation and long-term stability are required.
What is the standoff voltage (VWM) and why is it critical for SMCJ170AHE3/57T selection?
The SMCJ170AHE3/57T has a standoff voltage (VWM) of 170 V, meaning it remains non-conductive up to this DC or RMS voltage level. This parameter is critical because it must exceed the maximum normal operating voltage of the protected line-typically by ≥10–15%-to prevent leakage-induced power loss or false triggering. For example, in a 13.5 V automotive system, a 170 V VWM is appropriate for 120 VAC-derived DC buses, not low-voltage rails; selecting the correct VWM ensures the SMCJ170AHE3/57T activates only during actual overvoltage events.
How does the SMCJ170AHE3/57T differ from the bidirectional SMCJ170CAHE3/57T?
The SMCJ170AHE3/57T is unidirectional, with a cathode band marking and asymmetric conduction (conducts only in reverse bias), whereas the SMCJ170CAHE3/57T is bidirectional and functions identically in both polarities. Both share identical VWM, VBR, PPPM, and package, but the unidirectional version exhibits lower reverse leakage (≤1.0 μA vs. ≤2.0 μA for the CA variant) and is preferred for DC-biased lines like power rails. The SMCJ170AHE3/57T avoids unnecessary conduction during positive transients that would occur in bidirectional mode.
What is the thermal resistance and how does it affect PCB layout for SMCJ170AHE3/57T?
The SMCJ170AHE3/57T has 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, as defined in Vishay's datasheet. This value directly governs allowable power dissipation: at 6.5 W steady-state, junction temperature rise is ~488 °C above ambient-hence the device relies on short-duration surge duty, not continuous power. PCB layout must replicate the recommended pad size and copper area to achieve rated surge performance; undersized pads increase RθJA and risk thermal runaway during repeated transients.
SMCJ170AHE3/57T 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)
SMCJ170AHE3/57T FAQ
1.How can I place an order for SMCJ170AHE3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ170AHE3/57T 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 SMCJ170AHE3/57T reliable?
The price and inventory of SMCJ170AHE3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ170AHE3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ170AHE3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ170AHE3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ170AHE3/57T?
SMCJ170AHE3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ170AHE3/57T 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 SMCJ170AHE3/57T?
For technical support, including SMCJ170AHE3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ170AHE3/57T requirements.
6.How does Aetrix verify that SMCJ170AHE3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ170AHE3/57T 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 SMCJ170AHE3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ170AHE3/57T?
All SMCJ170AHE3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ170AHE3/57T, 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 SMCJ170AHE3/57T part is unused and in its original packaging.
Return procedure for SMCJ170AHE3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ170AHE3/57T Tags
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