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Vishay General Semiconductor - Diodes Division SM5S28AHM3/I
- Part No.:
- SM5S28AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AC
- Datasheet:
-
SM5S28AHM3/I.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO218AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,838
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Product details
Overview
SM5S28AHM3/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor 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 automotive load dump protection.
For engineers reviewing the SM5S28AHM3/I datasheet, SM5S28AHM3/I pinout, SM5S28AHM3/I application, or SM5S28AHM3/I equivalent, this page provides verified electrical parameters, thermal performance data, mechanical dimensions, and qualified alternative options aligned with ISO 7637-2 surge compliance and high-reliability automotive design requirements.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to achieve low leakage (<10 μA at VWM), low forward voltage drop (≤2.0 V at 100 A), and stable clamping under repetitive surge stress. Its DO-218AB package features a metal heatsink terminal (anode) and matte tin-plated leads compliant with J-STD-002 and JESD 22-B102.
The device operates across -55 °C to +175 °C, with thermal resistance junction-to-mount (RθJM) of 0.45 °C/W and junction-to-ambient (RθJA) of 55 °C/W on FR4 PCB. It meets MSL Level 1 and JESD 201 Class 2 whisker test requirements when specified with HE3 suffix.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR (nom) | 32.8 V - Breakdown voltage at 5 mA test current; defines precise turn-on threshold |
| VC @ IPPM | 45.4 V - Clamping voltage at 79 A peak pulse current; determines protected circuit's max transient exposure |
| PPPM (10/1000 μs) | 3600 W - Peak surge power handling capacity for standard automotive transients |
| TJ max | +175 °C - Enables operation in under-hood automotive environments without derating |
| Polarity | Unidirectional - Anode-connected heatsink configuration; suitable for DC bus protection only |
| IFSM | 500 A - Non-repetitive forward surge rating for inrush or fault-current events |
Pinout & Package
Package: DO-218AB - Surface-mount, single-ended metal heatsink package with anode connected to heatsink base and cathode on lead 1; UL 94 V-0 molding compound; footprint per IPC 7351.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 (Cathode) | Transient current return path | Connected to protected circuit ground or low-side reference; carries full clamped surge current |
| Metal Heatsink (Anode) | Main power rail connection | Directly bonded to PCB copper pour for thermal dissipation and low-inductance surge path; must be routed to positive supply rail |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including HTGB, HTRB, and TCT |
| Junction passivation | Stable VBR over lifetime and temperature; <10 μA leakage at VWM up to 175 °C |
| DO-218AB thermal performance | RθJM = 0.45 °C/W enables >90 % of rated PPPM under sustained surge conditions |
| ISO 7637-2 compliance | Validated for Load Dump Pulse 5a (10 ms exponential) up to 32 V system voltage |
| MSL Level 1 | Reflow-compatible without dry-pack or baking; peak reflow temperature up to 245 °C |
Applications
| Automotive Load Dump Protection | DC Motor Drive Power Supply |
|---|---|
Use Scenario: 12 V automotive battery line subjected to ISO 7637-2 Pulse 5a (load dump) up to 32 V and 1000 J energy. IC Role / Device Role / Timing Role: Primary clamping element placed between battery rail and downstream DC/DC converter input. Use Value: Limits transient voltage to ≤45.4 V during 79 A surges, preventing overvoltage failure of buck controller ICs and MOSFETs. |
Use Scenario: 24 V industrial motor drive with inductive kickback from brushed DC motor commutation. IC Role / Device Role / Timing Role: Unidirectional TVS mounted across H-bridge supply rail to absorb flyback energy. Use Value: Clamps reverse recovery spikes within 10 ns response time, reducing EMI and protecting gate drivers from >300 V transients. |
| Commercial Vehicle Lighting Systems | Truck Body Controller Power Input |
Use Scenario: LED headlamp module exposed to alternator ripple and cranking transients in heavy-duty truck applications. IC Role / Device Role / Timing Role: Standoff-rated TVS on 24 V input stage upstream of LED driver IC. Use Value: Maintains 28 V VWM margin while surviving 3600 W surges, ensuring zero false triggering during normal operation. |
Use Scenario: Central body control unit receiving power from chassis battery with long harness runs prone to coupled noise. IC Role / Device Role / Timing Role: First-line transient suppression on main 24 V power entry point. Use Value: Withstands repeated 10/1000 μs surges up to 79 A without parameter shift, supporting 15-year field life in harsh environments. |
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 | No /I suffix - lacks tape-and-reel packaging indicator; identical electrical and thermal specs | Same automotive load dump use case; differs only in packaging format (bulk vs. reel) | Select SM5S28AHM3/I for automated SMT assembly requiring 750-unit 13″ reel delivery mode |
| SMAJ28AHE3_A/H | Lower PPPM (400 W), SMA package (RθJA = 65 °C/W), same VWM/VBR but higher VC (48.4 V) | Acceptable for lower-energy transients; not recommended for ISO 7637-2 Pulse 5a compliance | Choose only if space-constrained layout prevents DO-218AB placement and surge energy remains <500 W |
Compared with SM5S28AHM3/I, SM5S28AHM3 offers identical performance in bulk form but no reel logistics; SMAJ28AHE3_A/H trades 90 % lower surge capacity and inferior thermal resistance for smaller footprint-making it unsuitable for high-energy automotive protection where SM5S28AHM3/I's 3600 W rating and 0.45 °C/W RθJM are critical.
Availability
SM5S28AHM3/I is available at Aetrix Electronics and suitable for automotive load dump protection, industrial motor drive power inputs, commercial vehicle lighting systems, and truck body controller power entry points requiring stable component supply across extended product lifecycles.
Supply support for SM5S28AHM3/I 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 high-reliability diodes, rectifiers, and protection devices for automotive, industrial, and computing markets.
The SM5SxxA family was engineered specifically for AEC-Q101-compliant, high-power transient suppression in 12 V and 24 V automotive electrical systems-prioritizing thermal robustness, surge repeatability, and under-hood temperature resilience.
FAQ
What is the clamping voltage of SM5S28AHM3/I at its rated peak pulse current?
The SM5S28AHM3/I has a maximum clamping voltage (VC) of 45.4 V at 79 A peak pulse current (IPPM) under 10/1000 μs waveform conditions. This value is measured per JEDEC standards and ensures downstream components see no more than 45.4 V during worst-case surge events. The SM5S28AHM3/I maintains this clamping performance across its full operating temperature range (-55 °C to +175 °C).
Is SM5S28AHM3/I suitable for ISO 7637-2 Load Dump Pulse 5a compliance?
Yes, the SM5S28AHM3/I is validated for ISO 7637-2 Pulse 5a (load dump) testing per manufacturer documentation. Its 3600 W peak pulse power rating, 45.4 V clamping voltage, and 175 °C junction rating enable reliable suppression of 32 V, 10 ms exponential transients typical in 24 V automotive systems. The SM5S28AHM3/I's DO-218AB package provides the thermal mass required to sustain this performance without degradation.
What does the "/I" suffix mean in SM5S28AHM3/I?
The "/I" suffix in SM5S28AHM3/I denotes the preferred package code for tape-and-reel delivery: 750 units per 13″ diameter plastic tape, with anode oriented toward the sprocket hole. This format is optimized for high-volume SMT assembly. The SM5S28AHM3/I shares identical electrical, thermal, and mechanical specifications with SM5S28AHM3-the only difference is packaging configuration and logistics coding.
Does SM5S28AHM3/I require a heatsink pad on the PCB?
Yes-the metal heatsink terminal (anode) of the SM5S28AHM3/I must be soldered to a minimum 100 mm² copper pour on the PCB to achieve rated thermal performance. Per Vishay's thermal characterization, this pad enables the RθJM of 0.45 °C/W and supports full 3600 W surge capability. Without adequate copper area, the SM5S28AHM3/I will thermally saturate and fail prematurely during repeated transients.
How does SM5S28AHM3/I compare to older SM5S28A in terms of qualification and reliability?
The SM5S28AHM3/I replaces legacy SM5S28A with enhanced qualifications: it carries the "H" grade (AEC-Q101 qualified), "E3" RoHS/compliance marking, and "M3" moisture sensitivity level 1 rating. Unlike earlier versions, the SM5S28AHM3/I is fully characterized for 175 °C operation and passes JESD 201 Class 2 whisker testing. These upgrades make the SM5S28AHM3/I the only recommended version for new automotive designs.
SM5S28AHM3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-218AC
- 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-218AC
SM5S28AHM3/I FAQ
1.How can I place an order for SM5S28AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM5S28AHM3/I 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 SM5S28AHM3/I reliable?
The price and inventory of SM5S28AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM5S28AHM3/I is usually 5 days.
3.What payment methods are accepted for SM5S28AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM5S28AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM5S28AHM3/I?
SM5S28AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM5S28AHM3/I 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 SM5S28AHM3/I?
For technical support, including SM5S28AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM5S28AHM3/I requirements.
6.How does Aetrix verify that SM5S28AHM3/I is sourced from the original manufacturer or authorized distributors?
All SM5S28AHM3/I 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 SM5S28AHM3/I meets industry standards.
7.What is the process for return or replacement of SM5S28AHM3/I?
All SM5S28AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM5S28AHM3/I, 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 SM5S28AHM3/I part is unused and in its original packaging.
Return procedure for SM5S28AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM5S28AHM3/I Tags
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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