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Vishay General Semiconductor - Diodes Division SMP28A-M3/85A
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- Part No.:
- SMP28A-M3/85A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-220AA
- Datasheet:
-
SMP28A-M3/85A.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO220AA
- Quantity:
- Payment:
- Shipping:
Inventory:19,070
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Product details
Overview
SMP28A-M3/85A from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) in the eSMP® Series, designed for clamping voltage transients on power and signal lines. It features a 28 V stand-off voltage (VWM), 31.1–34.4 V breakdown voltage (VBR), 400 W peak pulse power (10/1000 μs), 8.8 A peak pulse current (IPPM), and 45.4 V maximum clamping voltage (VC) - deployed in consumer, industrial, and telecom electronics for IC and MOSFET protection.
For engineers reviewing the SMP28A-M3/85A datasheet, SMP28A-M3/85A pinout, SMP28A-M3/85A application, or SMP28A-M3/85A equivalent, key selection criteria include unidirectional polarity, DO-220AA package compatibility, 1.0 mm profile height, MSL Level 1 rating, and 150 °C max junction temperature for high-reliability PCB layouts.
Technical Context
This TVS diode operates as a fast-acting shunt protector, responding to transient overvoltages within picoseconds and clamping at ≤45.4 V under 8.8 A surge current. Its low incremental surge resistance and 2.5 V forward voltage at 25 A support robust energy diversion without latch-up or thermal runaway.
The device uses silicon avalanche technology with a cathode-band polarity marker, housed in a halogen-free, RoHS-compliant SMP (DO-220AA) package. It meets JESD201 Class 2 whisker resistance and J-STD-020 MSL Level 1 reflow requirements up to 260 °C peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum reverse working voltage before clamping begins; defines safe operating range for continuous line bias. |
| VBR (min/max) | 31.1 V / 34.4 V - Breakdown threshold at 1 mA test current; ensures consistent turn-on across production lots. |
| VC @ IPPM | 45.4 V - Clamped voltage during 8.8 A 10/1000 μs surge; determines protected circuit's maximum stress level. |
| PPPM | 400 W - Peak pulse power handling per 10/1000 μs waveform; enables protection against IEC 61000-4-5 Level 4 surges. |
| IFSM | 40 A - Non-repetitive forward surge rating (10 ms half-sine); supports inrush current tolerance during system startup. |
| TJ max. | +150 °C - Maximum junction temperature; allows operation in high-ambient industrial environments with proper pad thermal design. |
Pinout & Package
Package: SMP (DO-220AA), 2-terminal surface-mount case with cathode band marking; 1.0 mm typical height, 0.087–0.103 inch (2.20–2.60 mm) length, 0.033–0.045 inch (0.85–1.15 mm) width; UL 94 V-0 molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction or transient clamping | Connected to lower-potential side of protected line; forms low-impedance path to ground when VR exceeds VBR. |
| Cathode | Current exit terminal; marked by color band | Connected to higher-potential side (e.g., VCC or signal line); defines unidirectional clamping direction. |
Key Features
| Feature | Design Value |
|---|---|
| Very low profile (1.0 mm height) | Enables use in space-constrained portable and ultra-thin designs without compromising board clearance or stacking height. |
| 400 W peak pulse power (10/1000 μs) | Provides IEC 61000-4-5 compliant surge immunity for 220 V AC mains-coupled transients in industrial interfaces. |
| MSL Level 1, 260 °C peak reflow | Supports single-pass lead-free reflow assembly without popcorn cracking or delamination risk. |
| Halogen-free, RoHS-compliant, JESD201 Class 2 | Meets global environmental compliance and long-term reliability standards for automotive-qualified supply chains. |
Applications
| USB Power Delivery Interface | Industrial PLC Digital Input Module |
|---|---|
Use Scenario: Protects 24 V DC input stage of USB PD controller ICs from inductive switching spikes and ESD events during hot-plug insertion. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between VBUS and GND, clamping transients before they reach the PD controller's internal LDO and communication logic. Use Value: Limits voltage excursion to ≤45.4 V during 8.8 A surges, preserving controller functionality and preventing latch-up in 28 V nominal systems. |
Use Scenario: Shields 24 V digital input optocoupler front-end from relay coil flyback and field-wiring induced surges in factory automation cabinets. IC Role / Device Role / Timing Role: Primary overvoltage clamp on the input node, positioned upstream of series current-limiting resistor and opto-LED anode. Use Value: Absorbs 400 W transient energy without degradation, maintaining >10⁵ surge cycles per MIL-STD-750 Method 2072. |
| Automotive Body Control Module (BCM) | Telecom Base Station Sensor Interface |
Use Scenario: Guards LIN bus transceiver power rail against load-dump and jump-start transients in 12 V vehicle subsystems. IC Role / Device Role / Timing Role: Secondary rail protector downstream of main DC-DC converter, clamping fast-rising transients before reaching transceiver VDD pin. Use Value: Responds in <1 ns to 100 V/μs edges, limiting clamped voltage to 45.4 V while sustaining 150 °C junction temperature under repeated stress. |
Use Scenario: Safeguards RS-485 transceiver data lines connected to outdoor environmental sensors exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Line-to-ground TVS on differential pair, configured with matched cathodes tied to chassis ground for common-mode suppression. Use Value: Delivers 45.4 V clamping at 8.8 A with <10 pF junction capacitance (per Fig. 4), preserving signal integrity up to 10 Mbps. |
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-M3/84A | Same electrical specs and package; differs only in tape-and-reel packaging (3000 pcs vs. 10000 pcs on 7″ vs. 13″ reel) | Identical functional performance; selected for smaller batch prototyping or low-volume production runs | Choose SMP28A-M3/84A when reel size or minimum order quantity constraints favor 7″ reels. |
| SMAJ28A | DO-214AC (SMA) package; 2.5 mm height; 400 W rating; VWM = 28 V, VC = 45.4 V - same clamping but larger footprint and higher thermal resistance (RθJA = 40°C/W vs. 250°C/W) | Used where legacy SMA footprints exist or where manual rework accessibility is prioritized over board space | Choose SMAJ28A only if existing PCB layout cannot accommodate DO-220AA's 1.0 mm height or 2.2 mm length. |
Compared with SMP28A-M3/84A, the SMP28A-M3/85A offers identical protection performance with optimized logistics for high-volume manufacturing; versus SMAJ28A, it delivers equivalent clamping with 55 % lower profile and superior automated placement yield in fine-pitch SMT lines.
Availability
SMP28A-M3/85A is available at Aetrix Electronics and suitable for industrial sensor interfaces, telecom line protection, and automotive body electronics requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMP28A-M3/85A 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, efficiency, and application-specific optimization.
The eSMP® Series, including SMP28A-M3/85A, was engineered for high-density surface-mount transient protection in space-constrained, high-reliability systems - targeting consumer, industrial, and telecom end equipment where low profile and MSL Level 1 compliance are critical.
FAQ
What is the polarity configuration of the SMP28A-M3/85A?
The SMP28A-M3/85A is a unidirectional Transient Voltage Suppressor with cathode denoted by a color band. It conducts in reverse-bias mode above its breakdown voltage (31.1–34.4 V), making it suitable for DC line protection where polarity is fixed. This configuration prevents forward conduction during normal operation while enabling precise clamping during overvoltage events on the SMP28A-M3/85A's protected node.
Does the SMP28A-M3/85A meet lead-free reflow requirements?
Yes, the SMP28A-M3/85A meets J-STD-020 MSL Level 1 and supports peak reflow temperatures up to 260 °C for lead-free soldering. Its matte tin-plated terminals comply with J-STD-002 and JESD22-B102, and the device passes JESD201 Class 2 whisker testing - all confirmed in Vishay document 88481. These qualifications ensure reliable solder joint formation without voiding or intermetallic degradation in the SMP28A-M3/85A's final assembly.
What is the maximum clamping voltage of the SMP28A-M3/85A under surge conditions?
The SMP28A-M3/85A has a maximum clamping voltage (VC) of 45.4 V when subjected to its rated 8.8 A peak pulse current (IPPM) using the standard 10/1000 μs waveform. This value is measured at the device terminals under specified test conditions (25 °C, 5.0 mm × 5.0 mm copper pads) and defines the upper voltage limit imposed on the protected circuit during transient events - a critical parameter for ensuring downstream IC survival in the SMP28A-M3/85A's application.
Can the SMP28A-M3/85A be used in bidirectional signal line protection?
No, the SMP28A-M3/85A is unidirectional and not suitable for bidirectional signal line protection such as RS-485 or USB D+/D− without external circuitry. For symmetrical clamping on AC or bidirectional lines, a dedicated bidirectional TVS like SMBJ28CA or two back-to-back SMP28A-M3/85A devices would be required. The SMP28A-M3/85A's single cathode band and specified unidirectional parameters confirm its intended use on polarized DC rails only.
What thermal resistance values apply to the SMP28A-M3/85A?
The SMP28A-M3/85A 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, both measured under standard PCB mounting conditions (5.0 mm × 5.0 mm copper pads per terminal). These values determine steady-state and transient thermal performance - for example, at 1 W dissipation, junction temperature rise above ambient is ~250 °C - underscoring the need for appropriate copper pour design when using the SMP28A-M3/85A in high-duty-cycle surge environments.
SMP28A-M3/85A 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-M3/85A FAQ
1.How can I place an order for SMP28A-M3/85A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMP28A-M3/85A 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-M3/85A reliable?
The price and inventory of SMP28A-M3/85A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMP28A-M3/85A is usually 5 days.
3.What payment methods are accepted for SMP28A-M3/85A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMP28A-M3/85A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMP28A-M3/85A?
SMP28A-M3/85A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMP28A-M3/85A 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-M3/85A?
For technical support, including SMP28A-M3/85A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMP28A-M3/85A requirements.
6.How does Aetrix verify that SMP28A-M3/85A is sourced from the original manufacturer or authorized distributors?
All SMP28A-M3/85A 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-M3/85A meets industry standards.
7.What is the process for return or replacement of SMP28A-M3/85A?
All SMP28A-M3/85A units undergo pre-shipment inspection (PSI). If there is an issue with SMP28A-M3/85A, 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-M3/85A part is unused and in its original packaging.
Return procedure for SMP28A-M3/85A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMP28A-M3/85A Tags
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