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Vishay General Semiconductor - Diodes Division 1.5SMC170A-M3/9AT
- Part No.:
- 1.5SMC170A-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC170A-M3/9AT.pdf
- Description:
- TVS DIODE 145VWM 234VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:8,453
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Product details
Overview
1.5SMC170A-M3/9AT 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. It features a 170 V standoff voltage (VWM), 162–179 V breakdown voltage (VBR) at 1 mA, 234 V clamping voltage (VC) at 6.4 A peak pulse current (IPPM), and 1500 W peak pulse power (10/1000 μs). It protects power rails and signal lines in industrial motor drives and automotive ECUs against lightning-induced transients and inductive switching spikes.
For engineers reviewing the 1.5SMC170A-M3/9AT datasheet, 1.5SMC170A-M3/9AT pinout, 1.5SMC170A-M3/9AT application, or 1.5SMC170A-M3/9AT equivalent, key selection criteria include unidirectional polarity, 1500 W surge rating, 234 V clamping performance at rated IPPM, thermal resistance (RθJA = 75 °C/W), and halogen-free RoHS-compliant M3 suffix qualification.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 μA leakage at 145 V), but triggers into low-impedance conduction when transient voltage exceeds its breakdown threshold (162–179 V). Its glass-passivated junction ensures stable VBR tolerance and fast response (<1 ns), while the SMC package supports automated placement and meets MSL level 1 reflow requirements (260 °C peak).
The device is rated for 1500 W peak pulse power with 10/1000 μs waveform at 0.01% duty cycle, derated linearly above 25 °C ambient per Fig. 2. Its maximum junction temperature is +150 °C, and it sustains 200 A non-repetitive forward surge current (8.3 ms half-sine), making it suitable for primary-side DC bus protection where high-energy transients occur infrequently.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off) | 145 V - Maximum continuous reverse operating voltage before significant leakage; defines safe DC/AC rail voltage margin. |
| VBR (Breakdown) | 162–179 V at 1 mA - Tight 5% tolerance window ensures predictable turn-on; critical for coordination with downstream IC overvoltage thresholds. |
| VC (Clamping) | 234 V at IPPM = 6.4 A - Peak voltage seen by protected circuit during full-rated surge; determines minimum withstand rating of downstream components. |
| PPPM | 1500 W (10/1000 μs) - Energy-handling capacity for standardized lightning/surge waveforms; validates suitability for IEC 61000-4-5 Level 4 compliance designs. |
| Leakage (ID) | 1.0 μA max at VWM - Ultra-low leakage preserves battery life and avoids false triggering in high-impedance sensor interfaces. |
| TJ max | +150 °C - Enables operation in under-hood automotive or enclosed industrial enclosures without derating penalties. |
| RθJA | 75 °C/W - Thermal resistance to ambient on standard 8 mm × 8 mm copper pads; informs heatsinking requirements for sustained surge duty cycles. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, halogen-free, RoHS-compliant (M3 suffix), matte tin-plated leads solderable per J-STD-002. Cathode indicated by band marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current return path during clamping | Connected to system ground or low-side reference; must handle full IPPM surge current without trace fusing. |
| Cathode | Protected line connection point | Connected to input rail (e.g., 12 V/24 V DC bus); clamps to anode when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power | Validates robustness against IEC 61000-4-5 combination wave surges up to 4 kV/2 Ω without degradation. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (<1 ns response), improving protection margin for sensitive gate drivers. |
| MSL Level 1 moisture sensitivity | Allows direct placement without baking; compatible with standard SMT reflow profiles up to 260 °C peak. |
| AEC-Q101 qualified option available | Base P/NHE3/HM3 variants meet automotive reliability standards; this M3 variant is commercial-grade but shares identical electrical specs. |
| Glass passivated junction | Ensures long-term VBR stability and low leakage drift across temperature and lifetime stress conditions. |
Applications
| Industrial Motor Drives | Automotive Engine Control Units |
|---|---|
Use Scenario: Protection of 24 V DC bus against back-EMF spikes from contactor switching and regenerative braking. IC Role / Device Role / Timing Role: Unidirectional shunt clamp placed between bus and chassis ground, triggered within nanoseconds upon overvoltage. Use Value: Limits transient voltage to ≤234 V, preventing damage to MOSFET gate oxides and microcontroller I/O pins rated for 36 V absolute maximum. |
Use Scenario: Safeguarding LIN bus transceivers and sensor supply lines from load dump and jump-start surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 12 V main rail upstream of LDOs and CAN/LIN interface ICs. Use Value: Withstands 200 A 8.3 ms surge (IFSM) and clamps 1500 W transients, meeting ISO 7637-2 Pulse 5a requirements without secondary protection stages. |
| Telecom Power Supplies | Consumer Appliance Control Boards |
Use Scenario: Input-stage protection for 48 V PoE-powered equipment exposed to lightning-induced surges on Ethernet cables. IC Role / Device Role / Timing Role: First-line TVS on DC input before DC/DC converters and PMICs; coordinated with MOVs for multi-stage clamping. Use Value: 145 V VWM allows compatibility with 48 V nominal systems (±10% tolerance), while 234 V VC ensures downstream 36 V-rated regulators remain within safe operating area. |
Use Scenario: Surge suppression on AC/DC adapter output rails feeding MCU, display, and relay driver circuits in washing machines and HVAC controllers. IC Role / Device Role / Timing Role: Low-leakage (≤1 μA) unidirectional clamp isolating sensitive logic from noisy 12–24 V power domains. Use Value: Halogen-free M3 construction satisfies regional environmental compliance (e.g., China RoHS), and SMC footprint enables high-density layout without compromising surge rating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ170A | Same VWM/VBR/VC specs, but SMB (DO-214AA) package - smaller footprint (4.6 × 3.6 mm vs. 7.1 × 6.2 mm), lower PPPM (600 W). | Limited to lower-energy transients (IEC 61000-4-5 Level 2); unsuitable for 1500 W surge environments. | Select only if board space is constrained and surge threat level is ≤600 W. |
| 1.5KE170A | Through-hole DO-15 package; identical electrical specs (VWM = 145 V, VC = 234 V), same 1500 W rating. | Requires manual or wave soldering; incompatible with fully automated SMT lines; higher RθJA (~50 °C/W on larger pads). | Choose for legacy through-hole designs or prototyping where reflow compatibility is not required. |
Compared with SMBJ170A, 1.5SMC170A-M3/9AT delivers 2.5× higher surge energy handling in a surface-mount format optimized for production automation; versus 1.5KE170A, it enables SMT scalability while maintaining identical clamping performance and thermal robustness on standard PCB pads.
Availability
1.5SMC170A-M3/9AT is available at Aetrix Electronics and suitable for industrial motor drives, automotive engine control units, and telecom power supplies requiring stable component supply, halogen-free compliance, and high-reliability transient suppression.
Supply support for 1.5SMC170A-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, efficiency, and application-specific optimization.
The 1.5SMC Series is engineered for high-power transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where robustness against lightning, ESD, and inductive switching is mission-critical.
FAQ
What is the clamping voltage of the 1.5SMC170A-M3/9AT under full-rated surge conditions?
The 1.5SMC170A-M3/9AT has a maximum clamping voltage (VC) of 234 V when subjected to its rated peak pulse current (IPPM) of 6.4 A using the standard 10/1000 μs waveform. This value is measured per Figure 1 in the Vishay datasheet 88303 and defines the upper voltage limit imposed on the protected circuit during worst-case transient events.
Is the 1.5SMC170A-M3/9AT suitable for automotive applications?
The 1.5SMC170A-M3/9AT is halogen-free and RoHS-compliant (M3 suffix), but it is not AEC-Q101 qualified. For automotive use, Vishay offers the HM3 variant (e.g., 1.5SMC170AHM3_A/I), which carries the same electrical specifications and adds AEC-Q101 qualification. The 1.5SMC170A-M3/9AT is intended for commercial/industrial applications where automotive qualification is not mandated.
What does the "/9AT" suffix indicate in 1.5SMC170A-M3/9AT?
The "/9AT" suffix denotes packaging: 13-inch diameter plastic tape and reel, with a standard quantity of 3500 pieces per reel. This format is optimized for high-volume SMT assembly lines using pick-and-place equipment compatible with EIA-481 standards. The "M3" prefix confirms halogen-free, RoHS-compliant construction.
How does the thermal resistance of the 1.5SMC170A-M3/9AT affect PCB layout?
The 1.5SMC170A-M3/9AT 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. To maintain TJ ≤ 150 °C under sustained power dissipation, designers must ensure adequate copper area and avoid excessive ambient temperature buildup-especially important in enclosed industrial enclosures where natural convection is limited.
Can the 1.5SMC170A-M3/9AT be used in bidirectional configurations?
No-the 1.5SMC170A-M3/9AT is a unidirectional TVS diode, identified by the "A" suffix and cathode band marking. For bidirectional operation, Vishay specifies the "CA" suffix (e.g., 1.5SMC170CA), which provides symmetrical clamping in both polarities and lacks polarity marking. Using the unidirectional 1.5SMC170A-M3/9AT in AC or reversible-polarity circuits will result in forward conduction and failure.
1.5SMC170A-M3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- 1.5SMC, TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 145V
- Voltage - Breakdown (Min):
- 162V
- Voltage - Clamping (Max) @ Ipp:
- 234V
- Current - Peak Pulse (10/1000µs):
- 6.4A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
1.5SMC170A-M3/9AT FAQ
1.How can I place an order for 1.5SMC170A-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC170A-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 1.5SMC170A-M3/9AT reliable?
The price and inventory of 1.5SMC170A-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 1.5SMC170A-M3/9AT is usually 5 days.
3.What payment methods are accepted for 1.5SMC170A-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC170A-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC170A-M3/9AT?
1.5SMC170A-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC170A-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 1.5SMC170A-M3/9AT?
For technical support, including 1.5SMC170A-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC170A-M3/9AT requirements.
6.How does Aetrix verify that 1.5SMC170A-M3/9AT is sourced from the original manufacturer or authorized distributors?
All 1.5SMC170A-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 1.5SMC170A-M3/9AT meets industry standards.
7.What is the process for return or replacement of 1.5SMC170A-M3/9AT?
All 1.5SMC170A-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC170A-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 1.5SMC170A-M3/9AT part is unused and in its original packaging.
Return procedure for 1.5SMC170A-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC170A-M3/9AT Tags
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