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Vishay General Semiconductor - Diodes Division SMP18A-M3/84A
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- Part No.:
- SMP18A-M3/84A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-220AA
- Datasheet:
-
SMP18A-M3/84A.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO220AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,535
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Product details
Overview
SMP18A-M3/84A from Vishay General Semiconductor is a unidirectional surface-mount TransZORB® transient voltage suppressor in the SMP (DO-220AA) package, with 18 V stand-off voltage (VWM), 20.0–22.1 V breakdown voltage (VBR), 400 W peak pulse power (10/1000 μs), 13.7 A peak pulse current (IPPM), and 29.2 V clamping voltage (VC). It protects MOSFETs and ICs in power supply input stages against inductive switching transients.
For engineers reviewing the SMP18A-M3/84A datasheet, SMP18A-M3/84A pinout, SMP18A-M3/84A application, or SMP18A-M3/84A equivalent, key selection criteria include unidirectional polarity, 1.0 mm profile for space-constrained PCBs, MSL Level 1 rating, halogen-free RoHS-compliant construction, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This device operates as a clamping-type TVS diode, leveraging silicon avalanche breakdown to limit transient overvoltages before they reach downstream circuitry. Its low incremental surge resistance and fast response time ensure effective suppression of sub-microsecond transients induced by relay switching or motor commutation.
The SMP18A-M3/84A is rated for continuous operation from –55 °C to +150 °C junction temperature, with thermal resistance of 50 °C/W (junction-to-lead) and 250 °C/W (junction-to-ambient), requiring proper pad layout per Vishay's recommended 5.0 mm × 5.0 mm copper areas for full 400 W pulse handling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - maximum reverse working voltage before clamping begins; defines safe operating range for normal circuit conditions |
| VBR min/max | 20.0 V / 22.1 V at 1.0 mA - verified avalanche onset range; ensures consistent turn-on behavior across production lots |
| VC @ IPPM | 29.2 V at 13.7 A - clamped voltage during 10/1000 μs surge; determines maximum stress imposed on protected ICs |
| PPPM | 400 W - peak pulse power handling capability under standardized waveform; validates robustness against IEC 61000-4-5 surges |
| IFSM | 40 A - non-repetitive forward surge current rating; supports protection during high-energy fault events |
| TJ max | +150 °C - maximum junction temperature; enables use in thermally demanding industrial environments |
Pinout & Package
Package: SMP (DO-220AA), ultra-low-profile surface-mount case with matte tin-plated leads, 1.0 mm typical height, UL 94 V-0 molding compound, cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to ground or lower-potential node in unidirectional configuration | Completes conduction path during transient clamp; must be routed to low-impedance return plane |
| Cathode | Current exit terminal in forward bias; connected to protected line (e.g., VIN, signal line) | Defines polarity-sensitive connection point; color band identifies this terminal for correct PCB orientation |
Key Features
| Feature | Design Value |
|---|---|
| Very low profile (1.0 mm typical height) | Enables integration into slim consumer electronics and dense automotive control modules without mechanical interference |
| 400 W peak pulse power (10/1000 μs) | Meets IEC 61000-4-5 Level 3 surge immunity requirements for industrial power inputs |
| MSL Level 1, peak reflow 260 °C | Supports single-pass lead-free reflow without preconditioning; eliminates moisture-related popcorning risk |
| Halogen-free, RoHS-compliant, industrial grade | Complies with EU Directive 2011/65/EU and IPC-1752A; qualified for extended-life embedded systems |
Applications
| Power Supply Input Protection | MOSFET Gate Driver Protection |
|---|---|
Use Scenario: DC input stage of industrial PLC power module exposed to relay-coil flyback and load-dump transients. IC Role / Device Role / Timing Role: Clamping TVS placed between VIN and GND to shunt surge energy before it reaches DC-DC controller ICs. Use Value: Limits transient voltage to ≤29.2 V, preventing latch-up or gate oxide damage in downstream 36 V-rated controllers. | Use Scenario: High-side N-channel MOSFET driver in motor H-bridge where gate-source voltage must remain within ±20 V absolute max. IC Role / Device Role / Timing Role: Unidirectional TVS across gate and source terminals to clamp Miller-induced spikes during fast switching. Use Value: Fast response and low clamping voltage prevent unintended turn-on or gate oxide overstress during 100 ns–1 μs transients. |
| Sensor Signal Line Protection | Automotive Body Control Module |
Use Scenario: CAN or LIN bus interface lines in automotive cabin sensors subjected to ESD and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Low-capacitance TVS on differential signal pair to suppress common-mode surges while preserving signal integrity. Use Value: 29.2 V clamping prevents damage to 5 V or 3.3 V transceiver ICs without adding >10 pF parasitic capacitance. | Use Scenario: 12 V battery-supplied lighting control unit enduring load dump (ISO 16750-2) and jump-start surges. IC Role / Device Role / Timing Role: Primary front-end TVS on main power rail to absorb up to 400 W for 1 ms, protecting MCU and driver ICs. Use Value: Rated 18 V VWM aligns with nominal 12 V system; 29.2 V VC ensures MCU reset threshold (typically 2.7–3.6 V) remains unaffected. |
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-M3/85A | Same electrical specs; differs only in packaging-10,000-piece 13" tape vs. 3,000-piece 7" tape | Identical functional use; selected for high-volume automated assembly requiring larger reels | Choose when optimizing for pick-and-place efficiency and reduced reel changeovers |
| SMBJ18A | Higher package thermal resistance (RθJA = 35°C/W vs. 250°C/W); same VWM/VBR/VC but lower IPPM (12.3 A vs. 13.7 A) | Less effective in high-temperature ambient or high-duty-cycle surge environments due to reduced power derating margin | Prefer SMP18A-M3/84A where board space allows and thermal performance is critical |
Compared with SMBJ18A and SMP18A-M3/85A, the SMP18A-M3/84A offers superior thermal management in compact layouts, identical clamping performance to SMBJ18A but with higher surge current tolerance, and optimized reel size for mid-volume production runs without sacrificing reliability or compliance.
Availability
SMP18A-M3/84A is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, sensor interface circuits, and consumer appliance control boards requiring stable component supply and long-term manufacturability.
Supply support for SMP18A-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, TVS devices, and optoelectronics with emphasis on reliability, precision, and high-power handling.
The SMP series was designed specifically for space-constrained, high-surge industrial and automotive applications where low-profile mounting, MSL Level 1 reflow compatibility, and repeatable clamping performance are mandatory.
FAQ
What is the clamping voltage of SMP18A-M3/84A under a 10/1000 μs surge?
The SMP18A-M3/84A has a maximum clamping voltage (VC) of 29.2 V at its rated peak pulse current (IPPM) of 13.7 A under a 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in Vishay's datasheet revision 25-Apr-2022, Document Number 88481. The SMP18A-M3/84A maintains this clamping performance across its specified operating temperature range.
Is SMP18A-M3/84A compatible with lead-free reflow soldering processes?
Yes, the SMP18A-M3/84A meets J-STD-020 MSL Level 1 and supports peak reflow temperatures up to 260 °C, making it fully compatible with standard lead-free soldering profiles. Its matte tin-plated leads comply with J-STD-002 and JESD 22-B102, and the M3 suffix confirms passing JESD 201 Class 2 whisker testing. The SMP18A-M3/84A requires no pre-baking prior to reflow.
What does the "84A" suffix indicate in SMP18A-M3/84A?
"84A" is Vishay's preferred package code denoting a 7-inch diameter plastic tape-and-reel format containing 3,000 units per reel. It specifies physical packaging and delivery mode-not electrical or thermal characteristics. The SMP18A-M3/84A shares identical electrical specifications with SMP18A-M3/85A (10,000-unit 13" reel), differing only in reel size and quantity.
Can SMP18A-M3/84A be used in bidirectional transient protection applications?
No, the SMP18A-M3/84A is strictly unidirectional, as confirmed by its polarity marking (cathode band) and electrical specifications including VBR and VWM defined only for reverse-bias operation. For bidirectional protection, Vishay offers separate part numbers such as SMBJ18CA; using SMP18A-M3/84A in AC-coupled or symmetrical surge scenarios would result in forward conduction failure and inadequate protection.
What is the thermal resistance from junction to ambient for SMP18A-M3/84A?
The SMP18A-M3/84A has a typical junction-to-ambient thermal resistance (RθJA) of 250 °C/W when mounted on the recommended 5.0 mm × 5.0 mm copper pad per terminal. This value assumes FR-4 PCB with no internal copper planes. Derating curves in the datasheet show power handling decreases above 25 °C ambient; the SMP18A-M3/84A's RθJL of 50 °C/W supports efficient heat transfer to the PCB land pattern.
SMP18A-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:
- 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):
- 13.7A
- 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)
SMP18A-M3/84A FAQ
1.How can I place an order for SMP18A-M3/84A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMP18A-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 SMP18A-M3/84A reliable?
The price and inventory of SMP18A-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 SMP18A-M3/84A is usually 5 days.
3.What payment methods are accepted for SMP18A-M3/84A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMP18A-M3/84A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMP18A-M3/84A?
SMP18A-M3/84A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMP18A-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 SMP18A-M3/84A?
For technical support, including SMP18A-M3/84A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMP18A-M3/84A requirements.
6.How does Aetrix verify that SMP18A-M3/84A is sourced from the original manufacturer or authorized distributors?
All SMP18A-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 SMP18A-M3/84A meets industry standards.
7.What is the process for return or replacement of SMP18A-M3/84A?
All SMP18A-M3/84A units undergo pre-shipment inspection (PSI). If there is an issue with SMP18A-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 SMP18A-M3/84A part is unused and in its original packaging.
Return procedure for SMP18A-M3/84A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMP18A-M3/84A Tags
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