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Vishay General Semiconductor - Diodes Division SMPC28A-M3/87A
- Part No.:
- SMPC28A-M3/87A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- TO-277, 3-PowerDFN
- Datasheet:
-
SMPC28A-M3/87A.pdf
- Description:
- TVS DIODE 28VWM 45.4VC TO277A
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMPC28A-M3/87A from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) in the SMPC (TO-277A) package, rated for 28.0 V stand-off voltage (VWM), 31.1–34.4 V breakdown voltage (VBR), 45.4 V maximum clamping voltage (VC) at 33.0 A peak pulse current, and 1500 W peak pulse power (PPPM) with 10/1000 μs waveform. It protects MOSFETs and signal lines in automotive sensor units against inductive switching transients.
For engineers reviewing the SMPC28A-M3/87A datasheet, SMPC28A-M3/87A pinout, SMPC28A-M3/87A application, or SMPC28A-M3/87A equivalent, key selection criteria include clamping voltage margin relative to protected IC's absolute maximum rating, thermal resistance (RθJA = 100 °C/W), unidirectional polarity alignment, MSL Level 1 reflow compatibility, and AEC-Q101 qualification status (not applicable to this M3-suffix industrial-grade variant).
Technical Context
This device operates as a silicon avalanche diode designed for fast transient suppression on DC power rails and low-voltage signal paths. Its unidirectional configuration requires cathode connection to the protected line and anode to ground, enabling precise overvoltage clamping without forward conduction during normal operation.
Clamping performance is defined under standardized 10/1000 μs surge conditions, with thermal derating above 25 °C ambient per Figure 2. The SMPC (TO-277A) package features dual anode terminals and a common cathode, supporting high-current surge handling while maintaining low profile (1.1 mm typical height) and automated placement compatibility.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28.0 V - Maximum continuous reverse operating voltage before clamping begins; must exceed system nominal rail voltage (e.g., 24 V automotive) with margin. |
| VBR min/max | 31.1 V / 34.4 V at 1.0 mA - Breakdown onset range; ensures reliable turn-on before protected circuit exceeds safe voltage limits. |
| VC @ IPPM | 45.4 V at 33.0 A - Clamped voltage during 10/1000 μs surge; determines maximum stress imposed on downstream components. |
| PPPM | 1500 W - Peak pulse power handling capability; defines survivability against standardized lightning or ESD-like surges. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance on FR4 PCB (2 oz copper); used to calculate temperature rise under sustained power dissipation. |
| Polarity | Unidirectional - Requires correct orientation (cathode toward protected line) to avoid forward conduction during normal operation. |
| MSL Level | Level 1 (J-STD-020) - Supports standard lead-free reflow up to 260 °C peak without preconditioning or dry-pack requirements. |
Pinout & Package
Package: SMPC (TO-277A), 3-terminal surface-mount case with dual anode leads and single cathode terminal; 1.1 mm typical height; UL 94 V-0 molding compound; matte tin-plated leads compliant with J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode 1 | Current return path during clamping | Electrically tied to Anode 2 internally; both must be connected to system ground for full surge current sharing and thermal distribution. |
| Anode 2 | Current return path during clamping | Parallel anode terminal-required for rated 1500 W PPPM; omitting either anode reduces surge capability and increases localized heating. |
| Cathode | Protected line interface | Connected to the line being protected (e.g., 24 V supply rail or sensor output); band-marked end denotes cathode polarity. |
Key Features
| Feature | Design Value |
|---|---|
| Very low profile (1.1 mm) | Enables use in space-constrained automotive ECUs and portable industrial sensors where Z-height is limited by adjacent connectors or shields. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (<1 ns), improving protection effectiveness for sensitive CMOS inputs. |
| Fast response time | Sub-nanosecond avalanche turn-on ensures clamping initiates before transient energy couples into protected ICs. |
| Halogen-free & RoHS-compliant | Meets EU Directive 2011/65/EU and IPC-1752A material declaration requirements for industrial and consumer end equipment. |
| JEDEC TO-277A footprint | Standardized land pattern enables drop-in replacement across Vishay's SMPC family and simplifies PCB layout reuse. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) in engine control modules from load-dump and inductive kickback. IC Role / Device Role / Timing Role: Unidirectional TVS placed between sensor signal line and ground, clamping transients before they reach the input stage of the signal conditioner or microcontroller ADC. Use Value: Limits voltage excursion to ≤45.4 V during 33 A surges, preserving integrity of 3.3 V or 5 V logic interfaces and preventing latch-up in downstream ASICs. | Use Scenario: Safeguarding digital input channels on programmable logic controllers exposed to 24 V DC field wiring carrying relay coil energy and motor noise. IC Role / Device Role / Timing Role: Primary overvoltage clamp on each 24 V input channel, mounted directly at connector entry point to shunt surge energy before it propagates into optocoupler or Schmitt-trigger input stages. Use Value: Withstands repeated 1500 W pulses without degradation, ensuring long-term reliability in factory automation environments with frequent contactor switching. |
| DC Power Rail Protection | Consumer Appliance Motor Drive Protection |
Use Scenario: Guarding 24 V or 28 V power distribution networks in telecom base station power supplies against hot-swap and back-EMF events. IC Role / Device Role / Timing Role: Parallel-connected TVS across bulk capacitor input to suppress voltage spikes induced by sudden load changes or cable inductance during insertion. Use Value: Clamps to 45.4 V within nanoseconds, preventing overvoltage shutdown or damage to synchronous buck controller ICs rated for 36 V max input. | Use Scenario: Shielding gate drivers and half-bridge MOSFETs in smart appliance motor inverters from commutation spikes generated by brushless DC motors. IC Role / Device Role / Timing Role: Mounted across low-side MOSFET source–drain or high-side bootstrap supply rail to clamp inductive flyback during PWM transitions. Use Value: Low Rsurge and fast response prevent voltage doubling effects that could exceed MOSFET VDSS, reducing need for oversized silicon. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28A-E3/5A | DO-214AC (SMA) package; 1000 W PPPM; higher RθJA (~140 °C/W); same VWM/VBR/VC specs. | Limited to lower-energy transients; less suitable for high-repetition or high-temperature industrial enclosures. | Select when board space allows larger footprint and thermal budget permits higher junction rise. |
| SMCJ28A | DO-214AB (SMC) package; 1500 W PPPM; RθJA ~105 °C/W; identical electrical specs but taller (2.3 mm) profile. | Better surge margin than SMAJ but incompatible with ultra-low-profile assemblies requiring <1.2 mm Z-height. | Choose when mechanical clearance allows greater height and existing SMC footprints exist. |
Compared with SMAJ28A-E3/5A and SMCJ28A, SMPC28A-M3/87A delivers equivalent 28 V clamping performance in a 1.1 mm profile with optimized thermal path via dual-anode grounding-critical for dense automotive PCBs where height and thermal management are co-constrained.
Availability
SMPC28A-M3/87A is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, and DC power distribution systems requiring stable component supply with consistent M3 industrial-grade compliance and tape-and-reel packaging (6500 pcs per 13″ reel).
Supply support for SMPC28A-M3/87A 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, MOSFETs, and protection devices with emphasis on reliability, precision, and automotive-grade qualification.
The SMPC series was developed specifically for high-power-density transient suppression in automotive and industrial environments where low profile, high surge capability, and MSL Level 1 reflow compatibility are mandatory design requirements.
FAQ
What is the maximum clamping voltage of SMPC28A-M3/87A under standard test conditions?
The SMPC28A-M3/87A has a maximum clamping voltage (VC) of 45.4 V when subjected to a 10/1000 μs surge waveform at its rated peak pulse current of 33.0 A. This value is measured per IEC 61000-4-5 and ANSI/IEEE C62.35 standards and defines the upper voltage limit imposed on protected circuits during transient events. Designers must verify that this clamped level remains below the absolute maximum rating of downstream components in the SMPC28A-M3/87A application.
Is SMPC28A-M3/87A qualified to AEC-Q101?
No, SMPC28A-M3/87A is not AEC-Q101 qualified. It carries the M3 suffix, indicating halogen-free, RoHS-compliant, industrial-grade construction. AEC-Q101 qualification applies only to variants with the HM3 suffix (e.g., SMPC28ANHM3), which are explicitly designated for automotive use. Engineers selecting SMPC28A-M3/87A should confirm suitability for non-automotive applications such as industrial controls or consumer power systems where AEC-Q101 is not mandated.
How should the dual anode terminals of SMPC28A-M3/87A be connected in PCB layout?
Both anode terminals (Anode 1 and Anode 2) of the SMPC28A-M3/87A must be independently routed to a low-impedance ground plane using symmetric, equal-length traces. This ensures balanced current sharing during surge events and prevents thermal concentration on one bond wire. The cathode terminal connects directly to the protected line. Failure to connect both anodes degrades peak pulse power rating and may cause premature failure under rated 1500 W conditions.
What is the meaning of the /87A package code in SMPC28A-M3/87A?
The /87A suffix in SMPC28A-M3/87A specifies the packaging format: 13-inch diameter plastic tape-and-reel with 6500 units per reel. This differs from /86A (7-inch reel, 1500 units). Both /86A and /87A are mechanically identical and electrically interchangeable; the choice depends solely on production volume requirements and pick-and-place machine compatibility. No electrical or thermal differences exist between /86A and /87A variants of SMPC28A-M3/87A.
Does SMPC28A-M3/87A require special handling for moisture sensitivity?
No, SMPC28A-M3/87A is rated MSL Level 1 per J-STD-020, meaning it has unlimited floor life and may be subjected to standard lead-free reflow profiles (peak 260 °C) without baking or dry-pack requirements. This eliminates moisture-related popcorning risk and simplifies manufacturing logistics for high-volume SMT assembly. The device's epoxy molding compound and matte tin plating contribute to this robust moisture resistance.
SMPC28A-M3/87A 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):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 45.4V
- Current - Peak Pulse (10/1000µs):
- 33A
- 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)
SMPC28A-M3/87A FAQ
1.How can I place an order for SMPC28A-M3/87A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMPC28A-M3/87A 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 SMPC28A-M3/87A reliable?
The price and inventory of SMPC28A-M3/87A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMPC28A-M3/87A is usually 5 days.
3.What payment methods are accepted for SMPC28A-M3/87A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMPC28A-M3/87A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMPC28A-M3/87A?
SMPC28A-M3/87A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMPC28A-M3/87A 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 SMPC28A-M3/87A?
For technical support, including SMPC28A-M3/87A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMPC28A-M3/87A requirements.
6.How does Aetrix verify that SMPC28A-M3/87A is sourced from the original manufacturer or authorized distributors?
All SMPC28A-M3/87A 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 SMPC28A-M3/87A meets industry standards.
7.What is the process for return or replacement of SMPC28A-M3/87A?
All SMPC28A-M3/87A units undergo pre-shipment inspection (PSI). If there is an issue with SMPC28A-M3/87A, 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 SMPC28A-M3/87A part is unused and in its original packaging.
Return procedure for SMPC28A-M3/87A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMPC28A-M3/87A Tags
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