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Vishay General Semiconductor - Diodes Division SMPC28A-M3/86A
- Part No.:
- SMPC28A-M3/86A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- TO-277, 3-PowerDFN
- Datasheet:
-
SMPC28A-M3/86A.pdf
- Description:
- TVS DIODE 28VWM 45.4VC TO277A
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMPC28A-M3/86A from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) in the eSMP® Series, designed for clamping inductive-switching transients on power and signal lines. It features a 28.0 V stand-off voltage (VWM), 31.1–34.4 V breakdown voltage (VBR), 45.4 V maximum clamping voltage at 33.0 A peak pulse current, 1500 W peak pulse power (10/1000 μs), and operates within -55 °C to +150 °C junction temperature range.
For engineers reviewing the SMPC28A-M3/86A datasheet, SMPC28A-M3/86A pinout, SMPC28A-M3/86A application, or SMPC28A-M3/86A equivalent, key selection criteria include clamping voltage margin relative to protected IC VDD, surge current handling under automotive load-dump conditions, thermal resistance (RθJA ≤ 100 °C/W), unidirectional polarity alignment with DC rail protection, and MSL Level 1 reflow compatibility.
Technical Context
This TVS diode uses an avalanche breakdown mechanism to divert transient energy away from sensitive downstream circuitry during fast-rising overvoltage events such as inductive kickback or ESD. Its low incremental surge resistance and sub-nanosecond response time ensure effective suppression before voltage overshoot damages MOSFET gates or microcontroller I/O pins.
The SMPC28A-M3/86A is configured in a dual-anode/single-cathode topology (Anode 1, Anode 2, Cathode) per the SMPC (TO-277A) package outline, enabling symmetrical mounting on FR4 PCBs with 2 oz copper. It is halogen-free, RoHS-compliant, and rated for industrial-grade operation - not AEC-Q101 qualified (that applies only to SMPCxxAN variants).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28.0 V - Maximum continuous reverse working voltage; must exceed normal system rail voltage to avoid leakage conduction during steady-state operation. |
| VBR min/max | 31.1 V / 34.4 V at 1.0 mA - Ensures reliable avalanche initiation above VWM with controlled tolerance band for production yield. |
| VC @ IPPM | 45.4 V at 33.0 A (10/1000 μs) - Clamping voltage seen by protected device during worst-case surge; defines minimum safe headroom for downstream component VDS or VIO rating. |
| PPPM | 1500 W - Peak pulse power handling capacity; determines survivability under standardized lightning or load-dump transients. |
| RθJA | ≤ 100 °C/W - Junction-to-ambient thermal resistance on FR4 with standard footprint; governs derating of power dissipation above 25 °C ambient. |
| Package | SMPC (TO-277A) - Surface-mount, 3-terminal, low-profile (1.1 mm typical height) package with matte tin-plated leads compliant to J-STD-002 solderability. |
| Polarity | Unidirectional - Cathode marked by band; conducts only during positive transients relative to cathode, requiring correct orientation on DC rails. |
Pinout & Package
SMPC28A-M3/86A is housed in the SMPC (TO-277A) package: a 3-terminal, single-row surface-mount outline conforming to JEDEC TO-277A, with 1.1 mm typical height, UL 94 V-0 molding compound, and cathode band marking terminal polarity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode 1 | Primary current entry path during clamping | Connected to protected line (e.g., 24 V supply rail); forms one half of parallel anode structure for low-inductance surge conduction. |
| Anode 2 | Secondary current entry path during clamping | Electrically tied to Anode 1 internally; enables symmetric PCB layout and reduces parasitic inductance versus single-anode designs. |
| Cathode | Common surge return path | Connected to system ground or low-impedance reference; marked by molded band; must be routed with minimal trace inductance for effective clamping. |
Key Features
| Feature | Design Value |
|---|---|
| Very low profile (1.1 mm) | Enables use in space-constrained industrial and telecom modules where Z-height limits stacked board assemblies or shielded enclosures. |
| MSL Level 1 (260 °C peak) | Supports standard lead-free reflow without preconditioning; eliminates moisture-related popcorning risk during manufacturing. |
| Low incremental surge resistance | Minimizes voltage overshoot during high-di/dt events (e.g., relay coil de-energization), improving protection margin for 30 V-rated MOSFETs. |
| Unidirectional configuration | Prevents unwanted conduction during normal negative-going signal swings; ideal for DC power rail protection where reverse voltage is absent. |
| Halogen-free & RoHS-compliant (M3 suffix) | Fulfills environmental compliance requirements for industrial equipment sold in EU, China, and North America without material declaration exceptions. |
Applications
| Industrial Motor Control | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: Protection of 24 V DC motor driver outputs against inductive kickback during PWM switching. IC Role / Device Role / Timing Role: Transient voltage suppressor placed across H-bridge high-side MOSFET drains and ground. Use Value: Limits voltage spikes to ≤45.4 V, preventing gate oxide rupture in 60 V-rated MOSFETs and ensuring long-term reliability under repeated load switching. |
Use Scenario: Safeguarding LIN bus transceivers and microcontroller I/O pins from battery line transients during jump-start or alternator load dump. IC Role / Device Role / Timing Role: Unidirectional TVS connected between LIN line and chassis ground, upstream of transceiver input. Use Value: Clamps 10/1000 μs surges up to 1500 W while maintaining <1 μA leakage at 28 V, preserving bus signal integrity and sleep-mode current budget. |
| Telecom Power Supply Input | Consumer Appliance Mainboard |
|
Use Scenario: Input-stage protection for 24 V telecom DC-DC converters exposed to field wiring surges and induced lightning transients. IC Role / Device Role / Timing Role: Primary-line TVS mounted directly at connector entry point, shunting surge energy to common ground plane. Use Value: Withstands 33 A peak pulse current and dissipates 1500 W transient energy without degradation, meeting IEC 61000-4-5 Level 3 requirements. |
Use Scenario: Overvoltage protection for microcontroller reset lines and sensor interface circuits in washing machine mainboards. IC Role / Device Role / Timing Role: Low-leakage (≤1 μA at VWM) TVS placed across 3.3 V or 5 V supply domains feeding critical logic. Use Value: Prevents latch-up or permanent damage during ESD events (>8 kV contact discharge) while adding negligible quiescent load to battery-backed subsystems. |
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-E3/61 | DO-214AC (SMA) package; 28 V VWM; 43.5 V VC @ 34.4 A; RθJA ≈ 140 °C/W; same unidirectional polarity. | Higher thermal resistance limits sustained surge duty cycle; larger footprint may conflict with dense layouts. | Choose SMAJ28A-E3/61 only if legacy SMA footprint compatibility is required and thermal derating margins allow. |
| SMCJ28A-M3/86A | Same SMPC package but higher PPPM (3000 W); 43.0 V VC @ 69.8 A; identical VWM/VBR; same M3/86A reel packaging. | Over-specified for 1500 W surge environments; higher cost and potential over-clamping stress on downstream components. | Choose SMCJ28A-M3/86A only when design requires >1500 W surge immunity (e.g., heavy-duty industrial actuators). |
Compared with SMAJ28A-E3/61 and SMCJ28A-M3/86A, SMPC28A-M3/86A delivers optimal balance of low-profile packaging, 1500 W surge capability, and thermal performance for space-limited 24 V systems - avoiding both footprint bloat and unnecessary power-handling overhead.
Availability
SMPC28A-M3/86A is available at Aetrix Electronics and suitable for industrial motor control, telecom power input protection, and consumer appliance mainboard designs requiring stable component supply, consistent M3-grade environmental compliance, and tight thermal management.
Supply support for SMPC28A-M3/86A 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 SMPC series was developed to address demand for ultra-low-profile, high-power TVS diodes in automated SMT assembly environments - targeting industrial, telecom, and automotive subsystems where board space and reflow robustness are critical.
FAQ
What is the maximum clamping voltage of the SMPC28A-M3/86A under standard test conditions?
The SMPC28A-M3/86A has a maximum clamping voltage (VC) of 45.4 V when subjected to a 10/1000 μs waveform at its rated peak pulse current of 33.0 A. This value is measured with the cathode mounted on heatsink per the datasheet test condition and defines the upper voltage limit imposed on protected circuitry during surge events. The SMPC28A-M3/86A maintains this clamping performance across its specified operating temperature range.
Is the SMPC28A-M3/86A AEC-Q101 qualified?
No, the SMPC28A-M3/86A is not AEC-Q101 qualified. Per Vishay documentation, AEC-Q101 qualification applies only to the SMPCxxAN variant suffix (e.g., SMPC28AN), which carries the HM3 suffix. The SMPC28A-M3/86A is designated for industrial-grade applications and meets RoHS, halogen-free, and MSL Level 1 requirements, but lacks automotive qualification testing.
What does the "/86A" suffix indicate in SMPC28A-M3/86A?
The "/86A" suffix in SMPC28A-M3/86A specifies the packaging format: 7-inch diameter plastic tape and reel, with a base quantity of 1500 units per reel. This is distinct from "/87A", which denotes 13-inch reels containing 6500 units. Both /86A and /87A are available for SMPC5.0A-M3 through SMPC36A-M3, and the "M3" denotes halogen-free, RoHS-compliant, industrial-grade construction.
How is polarity identified on the SMPC28A-M3/86A package?
Polarity on the SMPC28A-M3/86A is indicated by a molded cathode band on the package body. As confirmed in the mechanical drawings and ordering information, the terminal marked by this band is the cathode; the two opposing terminals are anodes (Anode 1 and Anode 2). Correct orientation is essential - the cathode must connect to the reference (e.g., ground) side of the protected line to enable proper unidirectional clamping action.
What is the thermal resistance specification for SMPC28A-M3/86A on a standard FR4 PCB?
The SMPC28A-M3/86A has a maximum junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on a standard FR4 PCB with 2 oz copper and the recommended footprint. Its typical RθJA is 85 °C/W. This value is critical for calculating allowable power dissipation at elevated ambient temperatures and must be applied using the derating curve in Figure 2 of the datasheet to ensure TJ remains ≤150 °C under continuous operation.
SMPC28A-M3/86A 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-M3/86A FAQ
1.How can I place an order for SMPC28A-M3/86A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMPC28A-M3/86A 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-M3/86A reliable?
The price and inventory of SMPC28A-M3/86A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMPC28A-M3/86A is usually 5 days.
3.What payment methods are accepted for SMPC28A-M3/86A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMPC28A-M3/86A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMPC28A-M3/86A?
SMPC28A-M3/86A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMPC28A-M3/86A 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-M3/86A?
For technical support, including SMPC28A-M3/86A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMPC28A-M3/86A requirements.
6.How does Aetrix verify that SMPC28A-M3/86A is sourced from the original manufacturer or authorized distributors?
All SMPC28A-M3/86A 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-M3/86A meets industry standards.
7.What is the process for return or replacement of SMPC28A-M3/86A?
All SMPC28A-M3/86A units undergo pre-shipment inspection (PSI). If there is an issue with SMPC28A-M3/86A, 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-M3/86A part is unused and in its original packaging.
Return procedure for SMPC28A-M3/86A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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