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Vishay General Semiconductor - Diodes Division SM5S28AHE3_A/K
- Part No.:
- SM5S28AHE3_A/K
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM5S28AHE3_A/K.pdf
- Description:
- TVS DIODE 28VWM DO-218AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,621
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Product details
Overview
SM5S28AHE3_A/K from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) in DO-218AB package, rated for 28 V stand-off voltage (VWM), 32.8 V nominal breakdown voltage (VBR), 45.4 V clamping voltage at 79 A peak pulse current, and 3600 W peak pulse power (10/1000 μs). It delivers AEC-Q101 qualification, 175 °C junction temperature capability, and low leakage (<10 μA at VWM), targeting automotive load dump protection.
For engineers reviewing the SM5S28AHE3_A/K datasheet, SM5S28AHE3_A/K pinout, SM5S28AHE3_A/K application, or SM5S28AHE3_A/K equivalent, key selection criteria include unidirectional polarity, DO-218AB thermal performance (RθJM = 0.45 °C/W), ISO7637-2 compliance, and suitability for high-reliability 12 V/24 V automotive power rail protection.
Technical Context
This TVS diode employs passivated anisotropic rectifier technology with junction passivation optimized for high-temperature stability. Its unidirectional structure features anode-connected metal heatsink for efficient thermal conduction, enabling operation up to TJ = 175 °C under sustained surge conditions.
The device meets MSL Level 1 per J-STD-020 (245 °C peak reflow), supports 500 A non-repetitive forward surge current (8.3 ms half-sine), and exhibits a +0.089 %/°C temperature coefficient of VBR - critical for predictable clamping behavior across automotive ambient ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28.0 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR (nom) | 32.8 V at 5 mA - precise breakdown threshold ensuring reliable turn-on during transients |
| VC @ IPPM | 45.4 V at 79 A (10/1000 μs) - limits downstream voltage stress during worst-case load dump events |
| PPPM | 3600 W (10/1000 μs) - sustains high-energy surges without failure in automotive ISO7637-2 testing |
| TJ max | 175 °C - enables placement near hot engine-control electronics without derating |
| RθJM | 0.45 °C/W - low junction-to-mount thermal resistance supports direct heatsink mounting for power dissipation |
| Polarity | Unidirectional - anode tied to system ground or chassis, cathode to protected line |
Pinout & Package
Package: DO-218AB - molded surface-mount case with integral metal heatsink (anode terminal), UL 94 V-0 rated, matte tin-plated leads compliant with J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Metal Heatsink) | Return path / thermal interface | Electrically and thermally connected to PCB copper pour or heatsink; must be grounded per layout guidelines |
| Cathode (Lead 1) | Protected line connection | Connected to the 12 V/24 V supply rail requiring transient suppression; carries full clamping current |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation optimized design | Enables stable VBR and low leakage (<10 μA at VWM, TJ = 175 °C) over lifetime in harsh environments |
| AEC-Q101 qualification | Validated reliability for automotive under-hood applications including temperature cycling, humidity, and mechanical shock |
| DO-218AB metal heatsink | Provides RθJM = 0.45 °C/W - reduces thermal impedance by >80% vs. standard SMC packages for same power handling |
| ISO7637-2 compliance | Meets Pulse 5a/b load dump test requirements for 12 V and 24 V systems without external series impedance |
| MSL Level 1 rating | Allows single-pass reflow at 245 °C peak without moisture-induced damage or delamination |
Applications
| Automotive Load Dump Protection | Industrial Power Supply Input Protection |
|---|---|
Use Scenario: Protecting engine control units (ECUs) and body control modules (BCMs) from 12 V battery system load dump transients (ISO7637-2 Pulse 5). IC Role / Device Role / Timing Role: Primary clamping device on main power rail, placed upstream of DC/DC converters and LDOs. Use Value: Limits voltage to ≤45.4 V during 3600 W surges, preventing latch-up or permanent damage to downstream silicon. | Use Scenario: Safeguarding programmable logic controllers (PLCs) and motor drives against inductive switching spikes in factory automation. IC Role / Device Role / Timing Role: Standoff-rated TVS on 24 V auxiliary power input, coordinated with upstream fuses and common-mode chokes. Use Value: Withstands 500 A 8.3 ms forward surge and maintains <10 μA leakage at 28 V, minimizing standby power loss. |
| Commercial Vehicle Lighting Systems | Heavy-Duty Equipment Battery Management |
Use Scenario: Securing LED headlamp drivers and CAN transceivers in trucks and buses subjected to repeated alternator load dumps. IC Role / Device Role / Timing Role: Unidirectional TVS mounted directly on PCB near connector entry point, anode tied to chassis ground. Use Value: 175 °C operation ensures functionality during extended engine runtime; DO-218AB heatsink prevents thermal runaway under repetitive surges. | Use Scenario: Protecting BMS front-end analog monitoring circuits from battery terminal transients during jump-start or short-circuit recovery. IC Role / Device Role / Timing Role: First-line transient suppressor on battery sense lines and charge/discharge paths. Use Value: Low VBR tolerance (±5 %) guarantees consistent clamping onset; RθJM = 0.45 °C/W enables compact layout without thermal vias. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SM5S28AHM3_A/K | Same electrical specs and DO-218AB package; HM3 suffix indicates enhanced material categorization (halogen-free, RoHS-compliant, whisker-tested) | No functional difference; intended as direct replacement for HE3 in new designs where stricter environmental compliance is required | Select SM5S28AHM3_A/K for new designs requiring halogen-free materials or updated JESD201 Class 2 whisker resistance |
| SMAJ28A | Lower PPPM (400 W), higher RθJA (60 °C/W), no AEC-Q101 qualification, SMA package (no metal heatsink) | Limited to non-automotive, lower-energy industrial applications; unsuitable for ISO7637-2 Pulse 5 or 175 °C operation | Use SMAJ28A only in cost-sensitive, low-surge consumer applications where AEC-Q101 and thermal performance are not required |
Compared with SM5S28AHE3_A/K, SM5S28AHM3_A/K offers identical protection performance with upgraded environmental compliance, while SMAJ28A provides basic TVS functionality at significantly reduced surge capacity and thermal robustness - making it unsuitable for automotive or high-reliability use.
Availability
SM5S28AHE3_A/K is available at Aetrix Electronics and suitable for automotive load dump protection, industrial PLC input protection, and commercial vehicle lighting systems requiring stable component supply and long-term lifecycle support.
Supply support for SM5S28AHE3_A/K 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 automotive-grade reliability and high-temperature performance.
The SM5SxxA family is engineered specifically for high-energy transient suppression in automotive power networks, combining AEC-Q101 qualification, DO-218AB thermal efficiency, and ISO7637-2 compliance to replace legacy SMC/SMA solutions.
FAQ
What is the clamping voltage of SM5S28AHE3_A/K at its rated peak pulse current?
The SM5S28AHE3_A/K has a maximum clamping voltage (VC) of 45.4 V at 79 A peak pulse current with a 10/1000 μs waveform. This value is measured under standardized test conditions and defines the upper voltage limit imposed on protected circuitry during a worst-case transient event. The SM5S28AHE3_A/K maintains this clamping performance across its full operating temperature range, supporting robust design margin in automotive applications.
Is SM5S28AHE3_A/K qualified for automotive use?
Yes, SM5S28AHE3_A/K is AEC-Q101 qualified and rated for operation from -55 °C to +175 °C junction temperature. It meets ISO7637-2 load dump requirements and is designed for under-hood automotive applications including engine control units and body electronics. The SM5S28AHE3_A/K also complies with MSL Level 1 and JESD201 Class 2 whisker testing, confirming suitability for automotive manufacturing environments.
What does the "HE3" suffix mean in SM5S28AHE3_A/K?
The "HE3" suffix in SM5S28AHE3_A/K denotes RoHS-compliant, lead-free termination with matte tin plating, AEC-Q101 qualification, and compliance with JESD201 Class 2 whisker resistance testing. The "E3" portion specifically indicates non-halogen-free, environmentally compliant packaging and plating. The "H" confirms automotive-grade qualification, distinguishing it from industry-grade variants without the H suffix.
Can SM5S28AHE3_A/K be used in bidirectional configurations?
No, SM5S28AHE3_A/K is unidirectional only, with polarity marked by anode connection to the metal heatsink. It is not rated for reverse-biased operation beyond its specified reverse leakage and breakdown characteristics. For bidirectional transient protection, Vishay offers separate part numbers such as SMBJ28CA; the SM5S28AHE3_A/K must be installed with correct orientation - anode to ground - to function as intended.
What is the thermal resistance from junction to mount for SM5S28AHE3_A/K?
The SM5S28AHE3_A/K has a typical junction-to-mount thermal resistance (RθJM) of 0.45 °C/W when mounted to a large copper area per JEDEC 51-14 TDIM methodology. This low value is enabled by the DO-218AB package's integral metal heatsink, allowing efficient heat transfer directly from the die to the PCB or external heatsink - a key advantage over standard SMC packages with RθJM > 2.0 °C/W.
SM5S28AHE3_A/K Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-218AB
- Series:
- PAR®
- 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):
- 79A
- Power - Peak Pulse:
- 3600W (3.6kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-218AB
SM5S28AHE3_A/K FAQ
1.How can I place an order for SM5S28AHE3_A/K through Aetrix?
Please submit a Request for Quotation (RFQ) for SM5S28AHE3_A/K 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 SM5S28AHE3_A/K reliable?
The price and inventory of SM5S28AHE3_A/K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM5S28AHE3_A/K is usually 5 days.
3.What payment methods are accepted for SM5S28AHE3_A/K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM5S28AHE3_A/K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM5S28AHE3_A/K?
SM5S28AHE3_A/K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM5S28AHE3_A/K 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 SM5S28AHE3_A/K?
For technical support, including SM5S28AHE3_A/K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM5S28AHE3_A/K requirements.
6.How does Aetrix verify that SM5S28AHE3_A/K is sourced from the original manufacturer or authorized distributors?
All SM5S28AHE3_A/K 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 SM5S28AHE3_A/K meets industry standards.
7.What is the process for return or replacement of SM5S28AHE3_A/K?
All SM5S28AHE3_A/K units undergo pre-shipment inspection (PSI). If there is an issue with SM5S28AHE3_A/K, 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 SM5S28AHE3_A/K part is unused and in its original packaging.
Return procedure for SM5S28AHE3_A/K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM5S28AHE3_A/K Tags
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