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Vishay General Semiconductor - Diodes Division SM5S28CAHM3/I
- Part No.:
- SM5S28CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM5S28CAHM3/I.pdf
- Description:
- 3600 W BI-DIRECTIONAL TVS IS DO-
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
SM5S28CAHM3/I from Vishay General Semiconductor is a surface-mount bidirectional PAR® transient voltage suppressor (TVS) designed for automotive load dump and inductive switching surge protection. It features a 31.1–34.4 V breakdown voltage (VBR), 28.0 V stand-off voltage (VWM), 45.4 V maximum clamping voltage (VC) at 79.3 A peak pulse current, and 3600 W peak pulse power (10/1000 µs). It operates from −55 °C to +175 °C and is AEC-Q101 qualified for under-hood automotive electronics.
For engineers reviewing the SM5S28CAHM3/I datasheet, SM5S28CAHM3/I pinout, SM5S28CAHM3/I application, or SM5S28CAHM3/I equivalent, this device is selected for high-reliability 12 V/24 V automotive power rail protection where low leakage (<10 µA at VWM), high surge capability, and DO-218AC thermal performance are critical - especially in engine control units, body control modules, and ADAS sensor interfaces.
Technical Context
The SM5S28CAHM3/I uses an avalanche diode structure optimized for fast response (<1 ns) to transients and stable clamping across temperature. Its bidirectional configuration enables symmetric suppression of positive and negative voltage spikes without polarity sensitivity, eliminating need for orientation during placement.
Thermal design leverages the DO-218AC package's low junction-to-mount thermal resistance (RθJM = 0.45 °C/W) and metal heatsink lead, enabling efficient heat transfer to PCB copper. It meets ISO 7637-2 (pulse 5a) and ISO 16750-2 surge requirements when applied with validated layout per JEDEC 51-14.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/typ/max) | 31.1 / 32.8 / 34.4 V - ensures reliable avalanche conduction onset above normal 28 V system transients while avoiding false triggering |
| VWM | 28.0 V - defines maximum continuous reverse operating voltage compatible with 24 V nominal automotive systems |
| VC @ IPPM | 45.4 V at 79.3 A - limits downstream IC stress during 3600 W (10/1000 µs) surges, keeping protected circuitry below 48 V absolute max |
| IPPM (10/1000 µs) | 79.3 A - quantifies single-event surge current handling capacity; derates linearly above 25 °C ambient |
| TJ max | +175 °C - supports placement near high-temperature engine compartments without derating or reliability loss |
| Leakage @ VWM | <10 µA at 25 °C - minimizes standby power loss in always-on vehicle networks (e.g., CAN wake-up circuits) |
| Package | DO-218AC - surface-mount outline with integrated metal heatsink lead; meets MSL Level 1 and JESD 201 Class 2 whisker resistance |
Pinout & Package
SM5S28CAHM3/I is housed in the DO-218AC package: a surface-mount, bidirectional TVS with two terminals - Lead 1 (anode side) and Lead 2 (metal heatsink/cathode side) - both electrically active and symmetric. Polarity marking is omitted due to bidirectional operation; no cathode band is present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Anode terminal (bidirectional) | Connects to protected line; forms one side of symmetrical avalanche junction; requires standard SMT pad per IPC 7351 |
| Lead 2 | Metal heatsink / cathode terminal (bidirectional) | Serves as primary thermal path to PCB copper; must be soldered to ≥100 mm² thermal pad for rated 3600 W surge performance |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness - required for Tier-1 production |
| 175 °C junction rating | Enables direct mounting on high-temperature PCB zones (e.g., near ignition coils or DC/DC converters) without thermal derating |
| ISO 7637-2 compliance | Guarantees survivability against standardized automotive load-dump pulses (P5a) up to 3600 W without failure or parameter shift |
| Halogen-free, RoHS-compliant (M3) | Meets global environmental regulations and eliminates halogen-related corrosion risks in humid under-hood environments |
| Low RθJM = 0.45 °C/W | Delivers >90% of rated surge power capability even with minimal PCB copper area - reduces thermal design overhead |
Applications
| Engine Control Unit (ECU) Power Input | Body Control Module (BCM) LIN Bus Line |
|---|---|
Use Scenario: Protects 12 V supply input of gasoline/diesel ECUs from alternator load dump surges up to 120 V and 3600 W. IC Role / Device Role / Timing Role: Primary front-end TVS clamp placed before DC/DC converter and microcontroller power rails. Use Value: Limits transient voltage to ≤45.4 V, preventing latch-up or damage to 5 V/3.3 V regulators and MCU I/O pins. |
Use Scenario: Shields LIN physical layer transceivers from battery line coupling and EMI-induced spikes in door modules and lighting nodes. IC Role / Device Role / Timing Role: Bidirectional line protector on LIN bus signal line referenced to battery ground. Use Value: Maintains signal integrity by clamping sub-100 ns transients without adding capacitance (>100 pF) that would distort 19.2 kbaud signaling. |
| ADAS Camera Power Rail | Electric Power Steering (EPS) Motor Driver |
Use Scenario: Safeguards 12 V input to CMOS image sensor modules exposed to ignition noise and relay switching in forward-facing cameras. IC Role / Device Role / Timing Role: Secondary overvoltage guard after primary fuse and upstream TVS, targeting residual high-frequency spikes. Use Value: Provides <10 µA leakage at 28 V to avoid dark current drift in analog sensor biasing circuits. |
Use Scenario: Protects gate drivers and current sense amplifiers in EPS motor control boards subjected to inductive kickback from 3-phase BLDC windings. IC Role / Device Role / Timing Role: High-energy clamp on low-side shunt and high-side bootstrap supply lines. Use Value: Absorbs 2400 W (10/10,000 µs) surges without degradation - critical for functional safety (ASIL-B/C) compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ28CA | Same VWM (28 V), but lower PPPM (400 W vs. 3600 W); DO-214AC package with higher RθJA (100 °C/W) | Rated for consumer/industrial use only; not AEC-Q101 qualified or ISO 7637-2 verified | Select only for non-automotive 24 V systems with <500 W surge exposure and no high-temp requirement |
| ON Semiconductor SMCJ28CA | Identical VWM/VC, but rated for 3000 W (10/1000 µs); DO-214AB package; RθJM not specified | AEC-Q101 qualified, but lacks ISO 16750-2 validation and has no documented 175 °C operation | Acceptable for cost-sensitive automotive designs where 3000 W margin suffices and thermal pad area is constrained |
Compared with SMAJ28CA and SMCJ28CA, the SM5S28CAHM3/I delivers 20% higher surge power, guaranteed 175 °C operation, and full ISO/automotive standard validation - making it the only choice for ASIL-compliant power rail protection where thermal margin and regulatory traceability are mandatory.
Availability
SM5S28CAHM3/I is available at Aetrix Electronics and suitable for automotive ECU protection, ADAS camera power conditioning, and electric power steering systems requiring stable component supply across extended product lifecycles and high-temperature operating conditions.
Supply support for SM5S28CAHM3/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, MOSFETs, and passive components for automotive, industrial, and computing markets.
The SM5S series is part of Vishay's PAR® TVS platform engineered specifically for automotive-grade transient suppression - emphasizing AEC-Q101 qualification, high-temperature stability, and ISO-standard surge compliance.
FAQ
What is the clamping voltage of SM5S28CAHM3/I at its rated peak pulse current?
The SM5S28CAHM3/I has a maximum clamping voltage (VC) of 45.4 V when subjected to its rated 79.3 A peak pulse current (IPPM) under the 10/1000 µs waveform. This value is measured per Figure 4 in the Vishay datasheet and ensures downstream 48 V-tolerant ICs remain within safe operating limits during surge events. The SM5S28CAHM3/I maintains this clamping performance across its full −55 °C to +175 °C operating range.
Is SM5S28CAHM3/I suitable for 24 V commercial vehicle applications?
Yes, the SM5S28CAHM3/I is explicitly validated for 24 V nominal systems, with a 28.0 V stand-off voltage (VWM) and 31.1–34.4 V breakdown range. Its 3600 W surge rating, ISO 7637-2 compliance, and 175 °C junction rating make it appropriate for heavy-duty truck ECUs, trailer control units, and off-highway equipment where higher energy transients occur. The SM5S28CAHM3/I's DO-218AC package also supports robust mechanical mounting in vibration-prone environments.
Does SM5S28CAHM3/I require orientation during PCB placement?
No, the SM5S28CAHM3/I is a bidirectional TVS diode with no polarity marking - its DO-218AC package omits the traditional cathode band. Both leads are functionally symmetric, allowing unrestricted placement on the PCB. This simplifies automated assembly and eliminates orientation-related defects. The SM5S28CAHM3/I's electrical behavior remains identical regardless of which lead connects to the protected line or ground.
How does the thermal performance of SM5S28CAHM3/I compare to standard SMA/SMB TVS diodes?
The SM5S28CAHM3/I achieves a junction-to-mount thermal resistance (RθJM) of 0.45 °C/W - over 5× lower than typical SMA (RθJA ≈ 100 °C/W) or SMB packages. This is enabled by its DO-218AC metal heatsink lead, which conducts heat directly into the PCB thermal pad. As a result, the SM5S28CAHM3/I sustains full 3600 W surge capability with less copper area, whereas SMA/SMB devices require large external heatsinks or significant derating above 25 °C.
What packaging and reel specifications apply to SM5S28CAHM3/I?
The SM5S28CAHM3/I ships in 13-inch diameter plastic tape and reel format, with 750 units per reel. The "I" suffix denotes the preferred package code per Vishay's ordering table, indicating anode orientation toward the sprocket hole. The HM3 designation confirms halogen-free, RoHS-compliant, AEC-Q101-qualified construction with matte tin-plated leads meeting J-STD-002 solderability standards. Traceability data is provided per reel lot.
SM5S28CAHM3/I 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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 45.4V
- Current - Peak Pulse (10/1000µs):
- 79.3A
- 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
SM5S28CAHM3/I FAQ
1.How can I place an order for SM5S28CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM5S28CAHM3/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 SM5S28CAHM3/I reliable?
The price and inventory of SM5S28CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM5S28CAHM3/I is usually 5 days.
3.What payment methods are accepted for SM5S28CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM5S28CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM5S28CAHM3/I?
SM5S28CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM5S28CAHM3/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 SM5S28CAHM3/I?
For technical support, including SM5S28CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM5S28CAHM3/I requirements.
6.How does Aetrix verify that SM5S28CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SM5S28CAHM3/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 SM5S28CAHM3/I meets industry standards.
7.What is the process for return or replacement of SM5S28CAHM3/I?
All SM5S28CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM5S28CAHM3/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 SM5S28CAHM3/I part is unused and in its original packaging.
Return procedure for SM5S28CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM5S28CAHM3/I Tags
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Diodes Incorporated
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