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Vishay General Semiconductor - Diodes Division SMP28A-M3/84A
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- Part No.:
- SMP28A-M3/84A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-220AA
- Datasheet:
-
SMP28A-M3/84A.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO220AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,089
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Product details
Overview
SMP28A-M3/84A from Vishay General Semiconductor is a unidirectional surface-mount TransZORB® transient voltage suppressor in the SMP (DO-220AA) package, rated for 400 W peak pulse power (10/1000 μs), 28 V stand-off voltage, and 45.4 V maximum clamping voltage at 8.8 A peak pulse current. It protects MOSFETs, ICs, and sensor signal lines against inductive switching transients in industrial and telecom equipment.
For engineers reviewing the SMP28A-M3/84A datasheet, SMP28A-M3/84A pinout, SMP28A-M3/84A application, or SMP28A-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 verified clamping performance under 10/1000 μs surge conditions.
Technical Context
This device operates as a unidirectional TVS diode with avalanche breakdown behavior, designed to clamp transient overvoltages before they damage downstream components. Its 31.1–34.4 V breakdown voltage range (at 1.0 mA test current) ensures reliable triggering above the 28 V stand-off level while maintaining low leakage (<1.0 μA).
Thermal design is supported by a typical junction-to-lead thermal resistance of 50 °C/W and junction-to-ambient of 250 °C/W, enabling effective heat dissipation when mounted on 5.0 mm × 5.0 mm copper pads per terminal. The device meets JESD 201 Class 2 whisker testing and UL 94 V-0 flammability requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum reverse operating voltage before significant leakage; defines safe DC/AC bias limit for protected circuit. |
| VBR (min/max) | 31.1 V / 34.4 V - Breakdown occurs within this range at 1.0 mA; ensures predictable turn-on margin above VWM. |
| VC @ IPPM | 45.4 V - Clamped voltage during 8.8 A 10/1000 μs surge; determines maximum stress seen by protected IC or MOSFET. |
| PPPM | 400 W - Peak pulse power handling capability; validates robustness against common lightning and ESD-induced surges. |
| IFSM | 40 A - Non-repetitive forward surge current rating (10 ms half-sine); supports high-energy fault events without bond wire failure. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in high-ambient industrial environments with proper layout. |
Pinout & Package
Package: SMP (DO-220AA), 2-terminal surface-mount case with cathode band marking; 1.0 mm typical height, 3.61 mm × 2.18 mm footprint; matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction or transient clamping | Connected to ground or low-impedance return path; forms clamping loop with cathode to shunt surge energy. |
| Cathode | Current exit point during clamping; marked with color band | Connected to protected line (e.g., signal or power rail); voltage referenced to anode during transient suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Very low profile (1.0 mm height) | Enables use in ultra-thin consumer and portable electronics where Z-height is constrained. |
| 400 W peak pulse power (10/1000 μs) | Meets IEC 61000-4-5 Level 3 surge immunity requirements for industrial interfaces. |
| MSL Level 1, peak reflow 260 °C | Supports standard lead-free SMT assembly without preconditioning or special handling. |
| Halogen-free, RoHS-compliant, industrial grade | Complies with environmental regulations and ensures long-term reliability in harsh operating conditions. |
Applications
| Industrial Motor Drives | Telecom Power Supplies |
|---|---|
Use Scenario: Protection of gate drivers and feedback sensing lines against voltage spikes from relay coil de-energization and PWM switching noise. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed across MOSFET gate-source or op-amp input pins to clamp sub-50 ns transients. Use Value: Limits clamped voltage to 45.4 V, preventing gate oxide rupture in 30 V-rated logic-level MOSFETs and ensuring stable analog front-end operation. | Use Scenario: Surge suppression on +24 V and -48 V DC distribution rails feeding base station RF modules and backhaul interfaces. IC Role / Device Role / Timing Role: Standoff-rated TVS connected between rail and chassis ground to absorb IEC 61000-4-5 combination wave surges. Use Value: Withstands 400 W pulses without degradation, maintaining system uptime during lightning-induced grid disturbances. |
| Automotive Body Control Modules | Industrial Sensor Signal Conditioning |
Use Scenario: Input protection for LIN bus transceivers and microcontroller GPIOs exposed to load dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional clamping device on 12 V supply inputs and bidirectional data lines (with additional series impedance). Use Value: Fast response time and low incremental surge resistance minimize voltage overshoot during 100 ns rise-time transients per ISO 7637-2. | Use Scenario: Protection of 4–20 mA current loop receivers and precision ADC inputs in factory automation sensors. IC Role / Device Role / Timing Role: Low-leakage (≤1.0 μA at 28 V) TVS placed across analog input terminals to prevent latch-up during ESD events. Use Value: Maintains signal integrity with <1.0 μA reverse leakage, avoiding offset errors in μV-level measurement circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMP28A-M3/85A | Same electrical specs; differs only in packaging-10,000-unit 13" tape-and-reel vs. 3,000-unit 7" reel. | Identical functional use; selected for high-volume automated assembly requiring larger reels. | Choose SMP28A-M3/85A when optimizing for pick-and-place efficiency and reduced reel changeovers in mass production. |
| SMCJ28A | Higher package thermal mass (DO-214AB); 1500 W PPPM; 44.2 V VC at 34.3 A; larger footprint (7.11 mm × 6.22 mm). | Better suited for higher-energy surges; not drop-in due to size and pad layout mismatch. | Select SMCJ28A only when surge threat exceeds 400 W and board space allows larger case. |
Compared with SMP28A-M3/84A, the SMP28A-M3/85A offers identical protection performance in a higher-volume reel format, while SMCJ28A provides greater surge capacity at the cost of PCB area and thermal interface redesign-making SMP28A-M3/84A optimal for compact, cost-sensitive industrial designs requiring precise 28 V standoff.
Availability
SMP28A-M3/84A is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, automotive body control modules, and industrial sensor signal conditioning requiring stable component supply and consistent MSL Level 1 compliance.
Supply support for SMP28A-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 transient protection devices with emphasis on reliability, power efficiency, and application-specific optimization.
The SMP series was developed to deliver high-power transient suppression in ultra-low-profile surface-mount packages for space-constrained industrial and communications systems where traditional DO-214 packages cannot fit.
FAQ
What is the breakdown voltage range of the SMP28A-M3/84A?
The SMP28A-M3/84A has a specified breakdown voltage (VBR) range of 31.1 V to 34.4 V at 1.0 mA test current. This range ensures consistent avalanche turn-on behavior above its 28 V stand-off voltage, allowing reliable clamping without premature conduction during normal operation. The SMP28A-M3/84A datasheet confirms this specification under Electrical Characteristics on page 2.
Does the SMP28A-M3/84A meet RoHS and halogen-free requirements?
Yes, the SMP28A-M3/84A is halogen-free, RoHS-compliant, and qualified as industrial grade per Vishay's documentation. The "M3" suffix explicitly denotes compliance with JESD 201 Class 2 whisker testing and material restrictions defined in Vishay document 99912. This makes the SMP28A-M3/84A suitable for environmentally regulated industrial and telecom applications.
What is the maximum clamping voltage for the SMP28A-M3/84A during a surge event?
The SMP28A-M3/84A exhibits a maximum clamping voltage (VC) of 45.4 V when subjected to its rated peak pulse current of 8.8 A using the standard 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during transient suppression. The SMP28A-M3/84A datasheet lists this parameter in the Electrical Characteristics table.
Can the SMP28A-M3/84A be used in bidirectional configurations?
No, the SMP28A-M3/84A is a unidirectional transient voltage suppressor, as confirmed by its polarity marking (cathode band) and electrical specifications including forward voltage (VF = 2.5 V at 25 A). For bidirectional protection, a separate device such as the SMBJ28CA or paired unidirectional units would be required. The SMP28A-M3/84A product family documentation specifies unidirectional operation only.
What is the thermal resistance from junction to ambient for the SMP28A-M3/84A?
The SMP28A-M3/84A has a typical junction-to-ambient thermal resistance (RθJA) of 250 °C/W when mounted on standard 5.0 mm × 5.0 mm copper pads per terminal. This value assumes the recommended pad layout shown in the package outline drawing and is critical for estimating temperature rise under sustained surge duty cycles. The SMP28A-M3/84A datasheet specifies this in the Thermal Characteristics section on page 2.
SMP28A-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):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 45.4V
- Current - Peak Pulse (10/1000µs):
- 8.8A
- 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)
SMP28A-M3/84A FAQ
1.How can I place an order for SMP28A-M3/84A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMP28A-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 SMP28A-M3/84A reliable?
The price and inventory of SMP28A-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 SMP28A-M3/84A is usually 5 days.
3.What payment methods are accepted for SMP28A-M3/84A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMP28A-M3/84A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMP28A-M3/84A?
SMP28A-M3/84A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMP28A-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 SMP28A-M3/84A?
For technical support, including SMP28A-M3/84A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMP28A-M3/84A requirements.
6.How does Aetrix verify that SMP28A-M3/84A is sourced from the original manufacturer or authorized distributors?
All SMP28A-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 SMP28A-M3/84A meets industry standards.
7.What is the process for return or replacement of SMP28A-M3/84A?
All SMP28A-M3/84A units undergo pre-shipment inspection (PSI). If there is an issue with SMP28A-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 SMP28A-M3/84A part is unused and in its original packaging.
Return procedure for SMP28A-M3/84A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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