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Vishay General Semiconductor - Diodes Division SM5S28AHE3/2D
- Part No.:
- SM5S28AHE3/2D
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM5S28AHE3/2D.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,657
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Product details
Overview
SM5S28AHE3/2D from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor designed for automotive load dump protection. It features a 28.0 V stand-off voltage (VWM), 31.1–34.4 V breakdown voltage (VBR), 45.4 V clamping voltage at 79 A peak pulse current, 3600 W peak pulse power (10/1000 μs), and AEC-Q101 qualification for under-hood electronics.
For engineers reviewing the SM5S28AHE3/2D datasheet, SM5S28AHE3/2D pinout, SM5S28AHE3/2D application, or SM5S28AHE3/2D equivalent, key selection criteria include unidirectional polarity, DO-218AB package thermal performance (RθJC = 1.0 °C/W), TJ = 175 °C operation, ISO7637-2 compliance, and low leakage (<10 μA at VWM).
Technical Context
The SM5S28AHE3/2D employs passivated anisotropic rectifier technology optimized for high-temperature stability and surge robustness. Its unidirectional configuration uses the metal heatsink as the anode terminal, enabling direct thermal coupling to PCB copper for enhanced power dissipation during 10 ms exponential load dump transients.
It delivers 3600 W peak pulse power under 10/1000 μs waveform and sustains 2800 W under 10/10 000 μs, with clamping voltage tightly controlled at 45.4 V at IPPM - critical for protecting 24 V automotive ECUs against battery line surges without over-clamping.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28.0 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR (min/max) | 31.1 V / 34.4 V - Breakdown occurs within this range at 5 mA test current |
| VC @ IPPM | 45.4 V - Clamps 79 A transient to ≤45.4 V, limiting downstream IC stress |
| PPPM (10/1000 μs) | 3600 W - Sustains high-energy automotive load dump pulses without failure |
| TJ max. | 175 °C - Enables placement near hot engine control units with no derating penalty |
| Polarity | Unidirectional - Anode connected to heatsink; cathode to protected line |
| MSL Level | Level 1 (245 °C peak) - Compatible with standard lead-free reflow profiles |
Pinout & Package
Package: DO-218AB - Surface-mount molded case with integral metal heatsink (anode), matte tin-plated leads, UL 94 V-0 rated compound, and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Cathode | Connected to protected circuit node; carries transient current into device |
| Lead 2 / Metal Heatsink | Anode | Primary thermal path and electrical connection to ground or battery return; must be soldered to ≥1 cm² copper pour |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier structure ensures stable VBR and low leakage up to 175 °C |
| AEC-Q101 qualification | Validated for automotive under-hood use including temperature cycling, humidity bias, and mechanical shock |
| ISO7637-2 compliance | Meets Pulse 5a/b load dump requirements for 24 V systems without external series impedance |
| Low forward voltage drop | VF ≤ 2.0 V at 100 A enables minimal conduction loss during surge events |
| Thermal resistance RθJC | 1.0 °C/W - Enables >4 W steady-state dissipation when mounted on adequate copper area |
Applications
| Engine Control Unit (ECU) Protection | Body Control Module (BCM) Power Input |
|---|---|
Use Scenario: Protects microcontroller power rails in diesel/gasoline engine ECUs exposed to 120 V/100 ms load dump transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamps battery line surges before they reach LDOs and MCU VDD pins. Use Value: 45.4 V clamping ensures downstream 3.3 V/5 V regulators remain within absolute maximum ratings during ISO7637-2 Pulse 5. | Use Scenario: Shields BCM power inputs from alternator-induced spikes during ignition switch-off in 24 V commercial vehicles. IC Role / Device Role / Timing Role: Fast-response PAR® suppressor diverts surge energy directly to chassis ground via heatsink. Use Value: 3600 W peak power rating handles repetitive 10/1000 μs transients without parametric shift or degradation. |
| ADAS Camera Power Supply | Electric Power Steering (EPS) ECU |
Use Scenario: Safeguards image sensor and SerDes power in front-facing ADAS cameras mounted near engine compartments. IC Role / Device Role / Timing Role: Standoff voltage (28.0 V) avoids false triggering during normal 24 V system operation while responding to fast transients. Use Value: <10 μA leakage at VWM prevents unnecessary quiescent current draw in always-on camera modules. | Use Scenario: Protects motor driver gate supplies and MCU I/O in EPS systems subject to high-current switching noise and load dump. IC Role / Device Role / Timing Role: DO-218AB package provides low-inductance path to ground, minimizing voltage overshoot during 500 A IFSM events. Use Value: 175 °C junction rating allows direct mounting on EPS module heatsinks without thermal derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28A-E3/5AT | DO-214AC package; lower PPPM (400 W); VBR 31.1–34.4 V; same VWM | Limited to low-energy transients; unsuitable for ISO7637-2 Pulse 5 | Select only for cost-sensitive 24 V consumer electronics with <500 W surge exposure |
| TPSMD28A | DO-218AB package; same footprint; PPPM = 3000 W; VC = 48.4 V at 62 A | Lower surge rating and higher clamping reduce protection margin in demanding automotive environments | Acceptable for non-critical 24 V subsystems where 3600 W headroom is not required |
Compared with SMAJ28A-E3/5AT and TPSMD28A, the SM5S28AHE3/2D delivers 9× higher peak pulse power and tighter clamping-enabling robust protection in AEC-Q101-compliant engine bay applications where thermal and surge margins are non-negotiable.
Availability
SM5S28AHE3/2D is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, ADAS camera power supplies, and electric power steering ECUs requiring stable component supply across long production lifecycles.
Supply support for SM5S28AHE3/2D 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 and automotive-grade qualification.
The SM5SxxA family is engineered specifically for high-energy transient suppression in 24 V automotive systems, targeting load dump, inductive switching, and ISO7637-2 compliance with extended temperature operation.
FAQ
What is the clamping voltage of the SM5S28AHE3/2D at its rated peak pulse current?
The SM5S28AHE3/2D has a maximum clamping voltage (VC) of 45.4 V at its specified peak pulse current (IPPM) of 79 A under 10/1000 μs waveform conditions. This value is measured per the test method defined in the Vishay datasheet 88382 and ensures predictable overvoltage limiting for downstream 24 V system components. The SM5S28AHE3/2D maintains this clamping performance across its full operating temperature range.
Is the SM5S28AHE3/2D qualified for automotive applications?
Yes, the SM5S28AHE3/2D is AEC-Q101 qualified and explicitly designed for automotive use. It meets ISO7637-2 surge requirements for 24 V systems, operates up to 175 °C junction temperature, and is manufactured with process controls validated for under-hood reliability. The HE3 suffix confirms RoHS compliance and JESD201 Class 2 whisker resistance - all documented in Vishay's official qualification report for the SM5S28AHE3/2D.
What does the "HE3/2D" suffix mean in SM5S28AHE3/2D?
The "HE3" suffix indicates RoHS-compliant, AEC-Q101-qualified construction with matte tin-plated leads meeting J-STD-002 and JESD22-B102 solderability standards and JESD201 Class 2 whisker resistance. The "2D" denotes the preferred packaging code for 13-inch plastic tape and reel, with 750 units per reel and anode orientation toward the sprocket hole - as specified in the Vishay ordering information table for SM5S28AHE3/2D.
How is thermal management handled for the SM5S28AHE3/2D?
The SM5S28AHE3/2D uses the DO-218AB package with a metal heatsink serving as the anode terminal, providing a low-thermal-resistance path (RθJC = 1.0 °C/W) from junction to case. Effective thermal management requires soldering the heatsink to ≥1 cm² of 2 oz copper on the PCB. This design enables the SM5S28AHE3/2D to dissipate up to 5 W continuously when properly mounted, supporting sustained operation in high-ambient environments.
Can the SM5S28AHE3/2D replace bidirectional TVS diodes in 24 V systems?
No - the SM5S28AHE3/2D is unidirectional only, with polarity fixed by its DO-218AB construction (heatsink = anode). It cannot substitute for bidirectional TVS devices in AC-coupled or dual-polarity protection schemes. For 24 V DC systems where transients occur only on the positive rail relative to ground - such as automotive battery lines - the SM5S28AHE3/2D is optimal. Using it in bidirectional configurations risks catastrophic failure due to forward conduction during negative excursions.
SM5S28AHE3/2D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-218AB
- Series:
- PAR®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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
SM5S28AHE3/2D FAQ
1.How can I place an order for SM5S28AHE3/2D through Aetrix?
Please submit a Request for Quotation (RFQ) for SM5S28AHE3/2D 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 SM5S28AHE3/2D reliable?
The price and inventory of SM5S28AHE3/2D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM5S28AHE3/2D is usually 5 days.
3.What payment methods are accepted for SM5S28AHE3/2D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM5S28AHE3/2D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM5S28AHE3/2D?
SM5S28AHE3/2D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM5S28AHE3/2D 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 SM5S28AHE3/2D?
For technical support, including SM5S28AHE3/2D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM5S28AHE3/2D requirements.
6.How does Aetrix verify that SM5S28AHE3/2D is sourced from the original manufacturer or authorized distributors?
All SM5S28AHE3/2D 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 SM5S28AHE3/2D meets industry standards.
7.What is the process for return or replacement of SM5S28AHE3/2D?
All SM5S28AHE3/2D units undergo pre-shipment inspection (PSI). If there is an issue with SM5S28AHE3/2D, 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 SM5S28AHE3/2D part is unused and in its original packaging.
Return procedure for SM5S28AHE3/2D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM5S28AHE3/2D Tags
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