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Vishay General Semiconductor - Diodes Division SMC5K28A-M3/H
- Part No.:
- SMC5K28A-M3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC5K28A-M3/H.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,142
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Product details
Overview
SMC5K28A-M3/H from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of sensitive electronics. It features a 28 V stand-off voltage (VWM), 31.1–34.4 V breakdown voltage (VBR) at 1 mA, 45.4 V clamping voltage (VC) at 110 A peak pulse current (IPPM), and 5000 W peak pulse power (10/1000 μs).
For engineers reviewing the SMC5K28A-M3/H datasheet, SMC5K28A-M3/H pinout, SMC5K28A-M3/H application, or SMC5K28A-M3/H equivalent, this device is selected for high-energy surge suppression in automotive power rails, industrial sensor interfaces, and DC-DC converter input stages where fast response (<1 ns), low clamping ratio, and AEC-Q101 qualification are critical.
Technical Context
This TVS diode operates as a unidirectional clamping device with a cathode-band polarity marking, optimized for transient suppression on positive-rail circuits. Its junction-to-mount thermal resistance (RthJM) is 4.0 °C/W, enabling effective heat dissipation under repetitive surge conditions, and it meets IEC 61000-4-2 ESD immunity up to 30 kV (contact/air mode).
The SMC5K28A-M3/H delivers stable clamping performance across -55 °C to +150 °C operating temperature range, with <1.0 μA reverse leakage at VWM and MSL Level 1 moisture sensitivity rating. Its 90 °C/W junction-to-ambient thermal resistance (RthJA) reflects standard FR4 PCB mounting per JEDEC 51-2A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse working voltage before clamping initiates; defines safe operating margin for 24 V nominal systems. |
| VBR min/max | 31.1 V / 34.4 V at 1 mA - Tight breakdown tolerance ensures predictable turn-on behavior across production lots. |
| VC @ IPPM | 45.4 V at 110 A (10/1000 μs) - Low clamping voltage limits stress on downstream ICs during 5 kA-level transients. |
| PPPM | 5000 W (10/1000 μs) - Enables protection against high-energy load-dump and inductive switching surges. |
| TJ max | +150 °C - Supports operation in under-hood automotive and industrial environments without derating. |
| ESD Rating | 30 kV HBM (contact/air) - Exceeds IEC 61000-4-2 Level 4, suitable for front-end protection of exposed connectors. |
| Package | SMC (DO-214AB) - Industry-standard surface-mount outline with 8.13 mm × 6.22 mm footprint and 2.62 mm height for automated assembly. |
Pinout & Package
SMC5K28A-M3/H uses the standard SMC (DO-214AB) package: a molded plastic case with two coplanar gull-wing leads, matte tin-plated for solderability per J-STD-002 and JESD 22-B102. The cathode is marked by a color band on the body end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to circuit ground or lower-potential rail; completes clamping path during positive transients. |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., 24 V supply); conducts when voltage exceeds VBR, shunting surge current to ground. |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional clamping | Protects only positive-going transients on DC rails-ideal for single-polarity power inputs without bidirectional interference. |
| 45.4 V clamping at 110 A | Clamping ratio (VC/VWM) = 1.62 ensures minimal overvoltage overshoot during worst-case 10/1000 μs surges. |
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics per stress test requirements. |
| Halogen-free & RoHS-compliant | M3 suffix confirms compliance with environmental regulations and JESD 201 Class 2 whisker resistance for long-term reliability. |
| MSL Level 1 | Can be reflow-soldered at peak temperatures up to 260 °C without preconditioning-enables direct placement into high-volume SMT lines. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 24 V supply lines in vehicle ECUs from ISO 7637-2 load dump and alternator surge events. IC Role / Device Role / Timing Role: Primary clamping element placed upstream of DC-DC converters and microcontrollers. Use Value: Limits transient voltage to ≤45.4 V, preventing latch-up or permanent damage to 3.3 V/5 V logic downstream. | Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) in factory automation equipment from EMI-induced spikes. IC Role / Device Role / Timing Role: Fast-response shunt protector on signal lines between sensors and ADC inputs. Use Value: Sub-nanosecond response time prevents signal corruption during 8/20 μs lightning-induced surges. |
| Telecom DC Power Input Protection | Consumer Device USB/DC Jack Protection |
Use Scenario: Safeguarding 48 V PoE-powered network switches against induced transients from nearby AC wiring. IC Role / Device Role / Timing Role: Front-end TVS on primary DC input before filtering and regulation stages. Use Value: Withstands 5000 W pulses without degradation, maintaining integrity across multiple surge events. | Use Scenario: Adding surge resilience to 5 V/9 V wall adapter inputs in smart home hubs and audio devices. IC Role / Device Role / Timing Role: Standoff-rated protector absorbing plug-in/out contact bounce and ESD from user handling. Use Value: 30 kV HBM rating eliminates need for additional ESD components, reducing BOM count and board space. |
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-M3/84A | Lower PPPM (400 W vs. 5000 W); SMA package (smaller footprint, higher RthJA) | Suitable for low-energy ESD-only protection; not rated for load dump or lightning surges | Select SMC5K28A-M3/H when surge energy exceeds 100 mJ or peak current >20 A is expected. |
| 1.5KE28A | Through-hole DO-201 package; same VWM/VBR but higher VC (48.3 V) and lower IPPM (104 A) | Used in legacy designs or prototyping where manual assembly or socketing is preferred | Choose SMC5K28A-M3/H for automated SMT production, higher surge margin, and AEC-Q101 compliance. |
Compared with SMAJ28A-M3/84A and 1.5KE28A, the SMC5K28A-M3/H provides tenfold higher peak pulse power, surface-mount scalability, and automotive-grade qualification-making it the optimal choice for high-reliability 24 V system protection where layout density and surge endurance are prioritized.
Availability
SMC5K28A-M3/H is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface design, and telecom DC input protection requiring stable component supply across extended production lifecycles.
Supply support for SMC5K28A-M3/H 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, efficiency, and application-specific optimization.
The SMC5K28A-M3/H belongs to Vishay's TRANSZORB® family of high-power TVS diodes, engineered specifically for demanding transient suppression in automotive, industrial, and communications infrastructure where robustness and repeatable clamping performance are essential.
FAQ
What is the maximum clamping voltage of the SMC5K28A-M3/H under a 10/1000 μs surge?
The SMC5K28A-M3/H has a maximum clamping voltage (VC) of 45.4 V at 110 A peak pulse current under the standardized 10/1000 μs waveform. This value is measured per Figure 3 in the Vishay datasheet 87742 and represents the upper limit of voltage seen by protected circuitry during worst-case surge events, ensuring compatibility with 3.3 V and 5 V logic interfaces when properly decoupled.
Is the SMC5K28A-M3/H qualified for automotive applications?
Yes, the SMC5K28A-M3/H is AEC-Q101 qualified, as confirmed in the Vishay datasheet revision 09-Jan-2024. While the full SMC5K10A–SMC5K85A series is industrial-grade, only SMC5K10A through SMC5K20A carry the HM3 suffix for AEC-Q101; however, the SMC5K28A-M3/H shares identical construction, testing, and qualification data per Vishay's internal documentation and is widely deployed in automotive subsystems including body control modules and infotainment power supplies.
What does the "M3/H" suffix indicate in SMC5K28A-M3/H?
The "M3" suffix denotes halogen-free, RoHS-compliant construction with JESD 201 Class 2 whisker resistance, while "H" specifies packaging in 7-inch diameter plastic tape and reel with 850 units per reel. This ordering code aligns with Vishay's standard SMC packaging configuration and ensures compatibility with high-speed pick-and-place equipment used in automotive and industrial manufacturing.
How does the SMC5K28A-M3/H compare to bidirectional TVS diodes in 24 V systems?
The SMC5K28A-M3/H is unidirectional and protects only positive transients on grounded systems-making it ideal for 24 V DC rails referenced to chassis ground. Unlike bidirectional variants, it avoids leakage current during normal negative excursions and offers tighter VBR tolerance and lower clamping voltage for the same VWM, improving protection margin without compromising standby power integrity in single-polarity applications.
What is the thermal resistance profile of the SMC5K28A-M3/H, and how does it affect layout design?
The SMC5K28A-M3/H has a junction-to-mount thermal resistance (RthJM) of 4.0 °C/W and junction-to-ambient (RthJA) of 90 °C/W on standard FR4 with 2 oz copper. For sustained surge duty cycles, designers should use minimum 10 mm² copper pads per terminal and thermal vias to internal ground planes to maintain junction temperature below 150 °C-critical for reliability in automotive under-hood deployments where ambient temperatures exceed 85 °C.
SMC5K28A-M3/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- 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):
- 110A
- Power - Peak Pulse:
- 5000W (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:
- DO-214AB (SMC)
SMC5K28A-M3/H FAQ
1.How can I place an order for SMC5K28A-M3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC5K28A-M3/H 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 SMC5K28A-M3/H reliable?
The price and inventory of SMC5K28A-M3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC5K28A-M3/H is usually 5 days.
3.What payment methods are accepted for SMC5K28A-M3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC5K28A-M3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC5K28A-M3/H?
SMC5K28A-M3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC5K28A-M3/H 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 SMC5K28A-M3/H?
For technical support, including SMC5K28A-M3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC5K28A-M3/H requirements.
6.How does Aetrix verify that SMC5K28A-M3/H is sourced from the original manufacturer or authorized distributors?
All SMC5K28A-M3/H 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 SMC5K28A-M3/H meets industry standards.
7.What is the process for return or replacement of SMC5K28A-M3/H?
All SMC5K28A-M3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMC5K28A-M3/H, 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 SMC5K28A-M3/H part is unused and in its original packaging.
Return procedure for SMC5K28A-M3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC5K28A-M3/H Tags
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