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Vishay General Semiconductor - Diodes Division SMP18-M3/84A
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- Part No.:
- SMP18-M3/84A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-220AA
- Datasheet:
-
SMP18-M3/84A.pdf
- Description:
- TVS DIODE 18VWM 32.2VC DO220AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,754
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Product details
Overview
SMP18-M3/84A from Vishay General Semiconductor is a unidirectional surface-mount TransZORB® transient voltage suppressor in DO-220AA (SMP) package, rated for 400 W peak pulse power (10/1000 μs), 18 V stand-off voltage (VWM), and 29.2 V clamping voltage at 13.7 A peak surge current. It protects MOSFETs and ICs against inductive switching transients in industrial sensor signal lines.
For engineers reviewing the SMP18-M3/84A datasheet, SMP18-M3/84A pinout, SMP18-M3/84A application, or SMP18-M3/84A equivalent, key selection criteria include unidirectional polarity, 1.0 mm profile height, MSL Level 1 rating, 150 °C max junction temperature, and RoHS/halogen-free compliance per JESD201 Class 1A whisker test.
Technical Context
This device operates as a silicon avalanche diode with precisely controlled breakdown characteristics, designed to clamp transient overvoltages before they damage downstream components. Its low incremental surge resistance and fast response time ensure effective suppression of sub-microsecond spikes induced by relay switching or motor commutation.
The SMP18-M3/84A is optimized for automated SMT placement on PCBs with 5.0 mm × 5.0 mm copper pads per terminal, delivering stable clamping performance across -55 °C to +150 °C operating range while maintaining <1.0 μA reverse leakage at 18 V stand-off.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse working voltage before conduction begins |
| VBR min/max | 20.0 V / 22.1 V - Breakdown occurs within this range at 1.0 mA test current |
| VC @ IPPM | 29.2 V - Clamps transients to ≤29.2 V when subjected to 13.7 A 10/1000 μs surge |
| PPPM | 400 W - Peak pulse power handling capability under standard 10/1000 μs waveform |
| IFSM | 40 A - Withstands single 10 ms half-sine surge without degradation |
| TJ max | +150 °C - Enables reliable operation in high-temperature industrial environments |
| Package | DO-220AA (SMP) - 1.0 mm typical height, compatible with fine-pitch automated assembly |
Pinout & Package
DO-220AA (SMP) is a two-terminal surface-mount package with cathode indicated by a color band. Terminals are matte tin-plated and solderable per J-STD-002 and JESD22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to circuit ground or lower potential node in unidirectional TVS configuration |
| Cathode | Current exit point during forward conduction; marked with band | Connected to protected line (e.g., sensor signal trace) to shunt transients to ground |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile packaging | 1.0 mm typical height enables use in space-constrained consumer and telecom modules |
| MSL Level 1 rating | Compatible with standard reflow profiles up to 260 °C peak, eliminating moisture sensitivity concerns |
| Halogen-free & RoHS | Meets JEDEC JS709A and EU Directive 2011/65/EU requirements for environmentally compliant designs |
| JESD201 Class 1A | Whisker-resistant terminations ensure long-term reliability in vibration-prone industrial applications |
Applications
| Industrial Sensor Protection | Automotive Body Control Module |
|---|---|
Use Scenario: Protecting analog output lines of pressure/temperature sensors exposed to relay-induced transients in factory automation PLCs. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between sensor signal trace and ground plane. Use Value: Limits transient excursions to ≤29.2 V, preventing latch-up or gate oxide damage in connected ADC front-ends. | Use Scenario: Safeguarding LIN bus communication lines in door module ECUs subject to load dump and jump-start events. IC Role / Device Role / Timing Role: Standoff-clamp protection element on bidirectional data line referenced to chassis ground. Use Value: Maintains signal integrity below 18 V DC bias while clamping 10/1000 μs surges to 29.2 V without affecting normal LIN timing. |
| Power Supply Input Stage | USB Port ESD/Transient Protection |
Use Scenario: Secondary overvoltage protection on 24 V DC input rails feeding isolated DC-DC converters in networking equipment. IC Role / Device Role / Timing Role: Parallel-connected transient suppressor upstream of primary input filter capacitor. Use Value: Absorbs 400 W pulses without thermal runaway, preserving converter startup behavior and enabling compact heatsinkless design. | Use Scenario: Board-level protection for VBUS line in USB 2.0 host ports exposed to hot-plug and cable discharge events. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to system ground, placed immediately after connector. Use Value: Achieves <1.0 μA leakage at 5 V nominal, ensuring no impact on USB suspend current budget while suppressing >30 V transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMP18A-M3/84A | Same electrical specs and package; identical marking code BT per datasheet Table 1 | No functional difference; SMP18A-M3/84A is the base-ordering variant without hyphenation | Select SMP18A-M3/84A when ordering through standard Vishay channels requiring full family naming convention |
| SMAJ18A | DO-214AC package (higher profile: 2.3 mm), 400 W rating, same VWM/VC but higher RθJA (350 °C/W vs. 250 °C/W) | Less suitable for ultra-thin designs; requires larger pad area and exhibits higher thermal rise under repeated surges | Choose SMAJ18A only if legacy footprint compatibility or higher surge repetition tolerance is required |
Compared with SMP18A-M3/84A (identical function) and SMAJ18A (larger package, higher thermal resistance), the SMP18-M3/84A delivers optimal board space efficiency and thermal performance for new designs targeting 1.0 mm profile constraints and high-volume SMT assembly.
Availability
SMP18-M3/84A is available at Aetrix Electronics and suitable for industrial sensor protection, automotive body control modules, and USB port transient suppression requiring stable component supply and consistent halogen-free compliance.
Supply support for SMP18-M3/84A 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 and application-specific optimization.
The SMP series was developed to address demand for ultra-low-profile, high-power TVS diodes in space-constrained SMT applications such as portable instrumentation, telecom infrastructure, and automotive electronics.
FAQ
What is the exact breakdown voltage range for SMP18-M3/84A?
The SMP18-M3/84A has a specified breakdown voltage (VBR) range of 20.0 V to 22.1 V at 1.0 mA test current, per Vishay Document Number 88481, page 2. This ensures predictable turn-on behavior during transient events while maintaining margin above its 18 V stand-off voltage. The SMP18-M3/84A achieves this via tightly controlled silicon avalanche characteristics in the DO-220AA package.
Is SMP18-M3/84A unidirectional or bidirectional?
The SMP18-M3/84A is a unidirectional transient voltage suppressor, as confirmed in the "PRIMARY CHARACTERISTICS" section of the Vishay datasheet (Document Number 88481, page 1). Polarity is indicated by a cathode band, and it is intended for DC-biased applications where reverse conduction must be blocked until clamping threshold is exceeded. The SMP18-M3/84A does not support AC or bipolar transient suppression.
What is the maximum clamping voltage of SMP18-M3/84A under surge conditions?
The SMP18-M3/84A clamps to a maximum of 29.2 V when subjected to its rated 13.7 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured at the device terminals with 5.0 mm × 5.0 mm copper pads per terminal, as defined in the "ELECTRICAL CHARACTERISTICS" table on page 2 of Vishay Document Number 88481. The SMP18-M3/84A maintains this clamping performance across its full operating temperature range.
Does SMP18-M3/84A meet RoHS and halogen-free requirements?
Yes, the SMP18-M3/84A is halogen-free and RoHS-compliant per JEDEC JS709A and EU Directive 2011/65/EU, as stated in the "MECHANICAL DATA" section (page 1) and "Material categorization" note of Vishay Document Number 88481. The "M3" suffix explicitly denotes halogen-free, RoHS-compliant, commercial-grade construction. The SMP18-M3/84A also passes JESD201 Class 1A whisker testing.
What is the thermal resistance specification for SMP18-M3/84A?
The SMP18-M3/84A has a typical junction-to-lead thermal resistance (RθJL) of 50 °C/W and a typical junction-to-ambient thermal resistance (RθJA) of 250 °C/W, per the "THERMAL CHARACTERISTICS" table on page 2 of Vishay Document Number 88481. These values assume mounting on 5.0 mm × 5.0 mm copper pads per terminal and define the device's ability to dissipate 400 W pulse energy without exceeding 150 °C junction temperature. The SMP18-M3/84A leverages the DO-220AA package's low-profile thermal path for efficient heat transfer.
SMP18-M3/84A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-220AA
- Series:
- TransZorb®, eSMP®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 32.2V
- Current - Peak Pulse (10/1000µs):
- 12.4A
- Power - Peak Pulse:
- 400W
- 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-220AA (SMP)
SMP18-M3/84A FAQ
1.How can I place an order for SMP18-M3/84A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMP18-M3/84A 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 SMP18-M3/84A reliable?
The price and inventory of SMP18-M3/84A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMP18-M3/84A is usually 5 days.
3.What payment methods are accepted for SMP18-M3/84A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMP18-M3/84A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMP18-M3/84A?
SMP18-M3/84A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMP18-M3/84A 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 SMP18-M3/84A?
For technical support, including SMP18-M3/84A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMP18-M3/84A requirements.
6.How does Aetrix verify that SMP18-M3/84A is sourced from the original manufacturer or authorized distributors?
All SMP18-M3/84A 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 SMP18-M3/84A meets industry standards.
7.What is the process for return or replacement of SMP18-M3/84A?
All SMP18-M3/84A units undergo pre-shipment inspection (PSI). If there is an issue with SMP18-M3/84A, 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 SMP18-M3/84A part is unused and in its original packaging.
Return procedure for SMP18-M3/84A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMP18-M3/84A Tags
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