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Vishay General Semiconductor - Diodes Division SMPC18A-M3/86A
- Part No.:
- SMPC18A-M3/86A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- TO-277, 3-PowerDFN
- Datasheet:
-
SMPC18A-M3/86A.pdf
- Description:
- TVS DIODE 18VWM 29.2VC TO277A
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMPC18A-M3/86A from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) in the eSMP® SMPC (TO-277A) package, designed for clamping inductive-switching transients on power and signal lines. It features a 18.0 V stand-off voltage (VWM), 20.0–22.1 V breakdown voltage (VBR), 29.2 V maximum clamping voltage (VC) at 1.0 A IPPM, 1500 W peak pulse power (PPPM), and operates from –55 °C to +150 °C.
For engineers reviewing the SMPC18A-M3/86A datasheet, SMPC18A-M3/86A pinout, SMPC18A-M3/86A application, or SMPC18A-M3/86A equivalent, key selection criteria include unidirectional polarity, low-profile 1.1 mm height, MSL Level 1 moisture sensitivity, halogen-free RoHS-compliant construction, and suitability for automotive-grade designs when ordered with HM3 suffix.
Technical Context
This TVS diode uses silicon avalanche junction technology to provide fast response (<1 ns) to transient overvoltages. Its two-anode–one-cathode configuration (SMPCxxA variant) enables symmetrical mounting on PCBs while maintaining unidirectional conduction from cathode to either anode.
The device is rated for 1.25 W steady-state power dissipation on FR4 with 2 oz copper, and its thermal resistance junction-to-ambient (RθJA) is 85–100 °C/W. Clamping performance is specified under standardized 10/1000 μs surge waveform conditions per ANSI/IEEE C62.35.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18.0 V - Maximum continuous reverse operating voltage before significant leakage; defines safe DC bias margin. |
| VBR min/max | 20.0 / 22.1 V - Breakdown occurs within this range at 1 mA test current; ensures predictable turn-on threshold. |
| VC @ IPPM | 29.2 V - Clamped voltage during 1.0 A 10/1000 μs surge; limits downstream IC stress to ≤29.2 V. |
| PPPM | 1500 W - Peak pulse power handling capability; supports high-energy transients like ISO 7637-2 Pulse 1/2a. |
| Package | SMPC (TO-277A) - 3-terminal surface-mount package with 1.1 mm typical height; optimized for automated placement and space-constrained layouts. |
| Polarity | Unidirectional - Cathode-band marked terminal conducts only from cathode to anodes; prevents reverse conduction in DC-biased rails. |
| RoHS/MSL | Halogen-free, RoHS-compliant, MSL Level 1 (260 °C peak reflow); enables lead-free assembly without dry-pack requirements. |
Pinout & Package
SMPC18A-M3/86A uses the SMPC (TO-277A) package: a 3-terminal, single-row surface-mount outline with cathode band marking, conforming to JEDEC TO-277A mechanical standard. Dimensions: 4.80 × 3.70 × 1.10 mm (L × W × H), 0.189" × 0.146" × 0.043". Mounting pad layout defined per datasheet Figure 5.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode 1 | Primary current path anode | Connected to protected line (e.g., 12 V rail); forms one half of dual-anode structure for flexible routing. |
| Anode 2 | Secondary current path anode | Electrically identical to Anode 1; allows symmetric PCB layout or dual-rail protection without polarity reversal. |
| Cathode (band-marked) | Common clamping node | Connected to ground or reference plane; all surge current flows through this terminal during clamping event. |
Key Features
| Feature | Design Value |
|---|---|
| Very low profile | 1.1 mm typical height - Enables use in ultra-thin consumer electronics and tight board gaps beneath shields. |
| Low incremental surge resistance | Ensures minimal voltage overshoot during fast transients - critical for protecting sensitive 3.3 V or 5 V logic interfaces. |
| Fast response time | <1 ns - Reacts before most microsecond-scale transients fully develop, preventing latch-up or gate oxide damage. |
| AEC-Q101 qualification option | Available with HM3 suffix (not applicable to SMPC18A-M3/86A) - Supports automotive powertrain and body electronics requiring qualified components. |
| Matte tin-plated leads | Solderable per J-STD-002 and JESD 22-B102 - Ensures reliable reflow joint formation and long-term intermetallic stability. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V supply rails in automotive ECUs against load-dump and inductive switching spikes per ISO 7637-2. IC Role / Device Role / Timing Role: Unidirectional TVS clamping element placed between battery rail and DC-DC input, absorbing energy before it reaches regulator ICs. Use Value: Limits transient voltage to ≤29.2 V during 1.0 A surges, preserving input-stage MOSFETs and LDOs rated for 36 V absolute maximum. | Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature) in factory automation PLC modules exposed to relay coil kickback. IC Role / Device Role / Timing Role: Signal-line TVS mounted directly at connector entry point, shunting ESD and inductive transients to chassis ground. Use Value: With 1.0 μA max IR at 18 V, it introduces negligible loading on high-impedance sensor outputs while clamping 1500 W surges. |
| Consumer USB Power Delivery | Telecom Base Station DC Feeds |
Use Scenario: Overvoltage protection on 5 V/9 V/15 V USB PD power paths in portable docking stations and monitors. IC Role / Device Role / Timing Role: Standoff-rated TVS placed upstream of USB PD controller and buck converter, blocking sustained overvoltage while clamping fast spikes. Use Value: 18.0 V VWM provides 3 V margin above 15 V PD profile, and 29.2 V VC ensures downstream 20 V-rated FETs remain within safe operating area. | Use Scenario: Secondary-side surge suppression on –48 V DC distribution feeds inside telecom rack-mounted equipment. IC Role / Device Role / Timing Role: Unidirectional TVS connected cathode-to-rail (reverse-biased), clamping positive-going transients on negative supply lines. Use Value: Dual-anode symmetry allows identical layout for ± rails; 1500 W PPPM handles lightning-induced surges per IEC 61000-4-5 Level 4. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18A-E3/5A | DO-214AC (SMA) package; 1.5 mm height; 18 V VWM; 29.2 V VC @ 1.0 A; same PPPM rating. | Larger footprint (4.5 × 2.7 mm vs. 4.8 × 3.7 mm); lower thermal mass; less effective for high-repetition surges. | Select when board space permits larger standoff or legacy SMA footprints are standardized. |
| SMCJ18A | DO-214AB (SMC) package; 2.6 mm height; 18 V VWM; 29.2 V VC @ 1.0 A; 1500 W PPPM; higher RθJA (~120 °C/W). | Higher profile limits use in slim enclosures; better surge endurance due to larger die but slower thermal recovery. | Select when mechanical robustness and legacy SMC compatibility outweigh low-profile requirement. |
Compared with SMAJ18A-E3/5A and SMCJ18A, SMPC18A-M3/86A delivers identical electrical clamping performance in a 1.1 mm profile optimized for modern compact designs, with superior thermal resistance (RθJA ≤100 °C/W) and dual-anode layout flexibility not available in SMA/SMC packages.
Availability
SMPC18A-M3/86A is available at Aetrix Electronics and suitable for automotive infotainment power rails, industrial sensor interface circuits, and consumer USB PD power delivery systems requiring stable component supply and consistent MSL Level 1 reflow compatibility.
Supply support for SMPC18A-M3/86A 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, TVS, MOSFETs, and optoelectronics with emphasis on reliability, precision, and application-specific optimization.
The SMPC series belongs to Vishay's Transient Voltage Suppressor family, engineered for high-power, low-profile surge protection in space-constrained automotive, industrial, and computing applications where fast clamping and AEC-Q101 readiness are critical.
FAQ
What is the maximum clamping voltage of SMPC18A-M3/86A under standard test conditions?
The SMPC18A-M3/86A has a maximum clamping voltage (VC) of 29.2 V when subjected to a 10/1000 μs surge waveform at 1.0 A peak pulse current (IPPM), as specified in the Vishay datasheet document 89116. This value ensures downstream circuitry remains within safe voltage limits during transient events. The SMPC18A-M3/86A maintains this clamping performance across its full operating temperature range.
Does SMPC18A-M3/86A meet automotive qualification standards?
No, SMPC18A-M3/86A is the industrial-grade variant with M3 suffix and is not AEC-Q101 qualified. AEC-Q101 qualification applies only to SMPCxxAN-HM3 variants (e.g., SMPC22ANHM3), as explicitly stated in the datasheet notes. The SMPC18A-M3/86A is suitable for commercial and industrial applications but requires separate validation for automotive use cases.
How is polarity identified on the SMPC18A-M3/86A package?
The SMPC18A-M3/86A uses a cathode band marking on the top surface of the SMPC (TO-277A) package to indicate the cathode terminal. As a unidirectional TVS, it conducts from either anode to the banded cathode. The band aligns with the cathode terminal in the 3-pin layout (Anode 1 / Anode 2 / Cathode), and orientation is confirmed by the mechanical drawing in datasheet page 5.
What is the thermal resistance junction-to-ambient for SMPC18A-M3/86A?
The SMPC18A-M3/86A has a typical junction-to-ambient thermal resistance (RθJA) of 85 °C/W and a maximum of 100 °C/W when mounted on a standard FR4 PCB with 2 oz copper and the recommended footprint. This value is measured per JEDEC 51-2A and directly impacts steady-state power derating above 25 °C ambient - for example, at 85 °C TA, PD must be reduced to ~0.75 W.
Can SMPC18A-M3/86A be used in bidirectional configurations?
No, SMPC18A-M3/86A is strictly unidirectional and cannot function as a bidirectional TVS. Its internal structure consists of a single avalanche junction between cathode and two anodes. For bidirectional protection, Vishay offers the SMPCxxAN series (e.g., SMPC22AN), which uses a different die configuration with back-to-back junctions. Using SMPC18A-M3/86A in reverse-biased mode risks permanent breakdown.
SMPC18A-M3/86A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- TO-277, 3-PowerDFN
- Series:
- TransZorb®, eSMP®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 29.2V
- Current - Peak Pulse (10/1000µs):
- 51.4A
- 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:
- TO-277A (SMPC)
SMPC18A-M3/86A FAQ
1.How can I place an order for SMPC18A-M3/86A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMPC18A-M3/86A 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 SMPC18A-M3/86A reliable?
The price and inventory of SMPC18A-M3/86A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMPC18A-M3/86A is usually 5 days.
3.What payment methods are accepted for SMPC18A-M3/86A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMPC18A-M3/86A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMPC18A-M3/86A?
SMPC18A-M3/86A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMPC18A-M3/86A 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 SMPC18A-M3/86A?
For technical support, including SMPC18A-M3/86A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMPC18A-M3/86A requirements.
6.How does Aetrix verify that SMPC18A-M3/86A is sourced from the original manufacturer or authorized distributors?
All SMPC18A-M3/86A 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 SMPC18A-M3/86A meets industry standards.
7.What is the process for return or replacement of SMPC18A-M3/86A?
All SMPC18A-M3/86A units undergo pre-shipment inspection (PSI). If there is an issue with SMPC18A-M3/86A, 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 SMPC18A-M3/86A part is unused and in its original packaging.
Return procedure for SMPC18A-M3/86A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMPC18A-M3/86A Tags
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