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Vishay General Semiconductor - Diodes Division SM5S20CAHM3/I
- Part No.:
- SM5S20CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM5S20CAHM3/I.pdf
- Description:
- 3600 W BI-DIRECTIONAL TVS IS DO-
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
SM5S20CAHM3/I from Vishay General Semiconductor is a bidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for automotive load dump protection. It features a 20 V stand-off voltage (VWM), 22.2–24.5 V breakdown voltage (VBR), 32.4 V maximum clamping voltage (VC) at 111 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 SM5S20CAHM3/I datasheet, SM5S20CAHM3/I pinout, SM5S20CAHM3/I application, or SM5S20CAHM3/I equivalent, this device is selected for high-reliability 12 V automotive power rail protection where ISO 7637-2 and ISO 16750-2 surge compliance, low leakage (<10 μA at VWM), and DO-218AC package thermal performance are critical design requirements.
Technical Context
This TVS diode uses an avalanche-based silicon junction to clamp transient overvoltages in bidirectional configurations without polarity marking. Its DO-218AC case provides low thermal resistance (RθJM = 0.45 °C/W) and direct metal heatsink contact via the cathode-side terminal, enabling robust energy dissipation during 10/1000 μs surges up to 3600 W.
It is characterized for operation across −55 °C to +175 °C junction temperature, with derated peak pulse power above 25 °C ambient and validated performance under automotive load dump waveforms per ISO 7637-2 Pulse 5a/5b. The HM3 suffix confirms halogen-free, RoHS-compliant construction and JESD 201 Class 2 whisker resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC operating window for 12 V automotive systems. |
| VBR (min/typ/max) | 22.2 / 23.4 / 24.5 V - Voltage at 5 mA test current; ensures reliable triggering above normal system transients but below damage thresholds. |
| VC @ IPPM | 32.4 V at 111 A - Clamped voltage during 10/1000 μs surge; limits downstream IC stress to <33 V during worst-case load dump events. |
| PPPM (10/1000 μs) | 3600 W - Peak surge power handling; supports >3× higher energy than standard SMA packages for compact board space. |
| ID @ VWM | <10 μA at 25 °C - Ultra-low reverse leakage preserves battery drain budgets in always-on vehicle modules. |
| TJ max. | +175 °C - Enables placement near hot engine-control units without derating; validated per AEC-Q101 high-temperature lifetime testing. |
| Package | DO-218AC - Surface-mount case with integrated metal heatsink pad; achieves RθJM = 0.45 °C/W for direct PCB copper thermal coupling. |
Pinout & Package
SM5S20CAHM3/I is housed in a DO-218AC surface-mount package with two terminals: Terminal 1 (anode) and Terminal 2 (cathode/metal heatsink). The package has no polarity marking due to bidirectional operation; both terminals function identically under reverse or forward surge conditions. Thermal performance relies on soldering Terminal 2 to a large copper pour for heatsinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode (marked by sprocket hole orientation in tape) | Primary connection point for circuit routing; electrically symmetric with Terminal 2 in bidirectional operation. |
| Terminal 2 | Cathode / Metal Heatsink Pad | Must be soldered to ≥100 mm² copper area for thermal management; provides lowest RθJM path to PCB. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive under-hood use including temperature cycling, humidity bias, and mechanical shock per JESD47. |
| ISO 7637-2 & ISO 16750-2 compliance | Passes Pulse 5a (load dump) and Pulse 5b (superimposed ripple) tests up to 35 V, 400 ms duration at 175 °C. |
| DO-218AC thermal architecture | RθJM = 0.45 °C/W enables 111 A surge current handling without external heatsink-critical for space-constrained ECUs. |
| Halogen-free, RoHS-compliant M3 termination | Matte tin plating meets J-STD-002 solderability and JESD22-B102 whisker resistance Class 2 for long-term reliability. |
| Bidirectional symmetry | No cathode band required; simplifies layout and eliminates polarity assembly errors in dual-rail or AC-coupled protection paths. |
Applications
| Engine Control Unit (ECU) Power Input | Body Control Module (BCM) CAN Bus Protection |
|---|---|
Use Scenario: Protects 12 V supply rail of gasoline/diesel engine control units against alternator load dump transients up to 35 V, 400 ms. IC Role / Device Role / Timing Role: Primary clamping device placed upstream of DC/DC converters and microcontrollers to limit input voltage excursion. Use Value: Clamps to 32.4 V at 111 A, preventing latch-up or gate oxide damage in downstream 3.3 V/5 V logic while surviving repeated surges per ISO 7637-2. |
Use Scenario: Shields CAN transceivers and microcontroller I/O from coupled transients induced by nearby solenoid switching in body electronics. IC Role / Device Role / Timing Role: Bidirectional shunt protector on CAN_H/CAN_L differential pair, leveraging symmetry to suppress ±30 V spikes without polarity concern. Use Value: Low 10 μA leakage avoids CAN bus bias shift; 32.4 V clamping preserves signal integrity during ESD and load dump coupling into harnesses. |
| Advanced Driver Assistance Systems (ADAS) Camera Power | Electric Power Steering (EPS) Motor Driver Supply |
Use Scenario: Secures 12 V input to image sensor modules mounted near engine compartments, exposed to thermal cycling and repetitive surges. IC Role / Device Role / Timing Role: First-line transient suppressor before LDO regulators feeding CMOS image sensors and ISP processors. Use Value: 175 °C junction rating allows operation adjacent to hot optics housings; DO-218AC thermal path sustains >1000 surge cycles without degradation. |
Use Scenario: Guards H-bridge driver ICs and gate drivers in EPS motor control units against inductive kickback from 3-phase BLDC motors. IC Role / Device Role / Timing Role: High-energy clamping element on main 12 V bus feeding motor driver stage, absorbing 3600 W pulses. Use Value: 3600 W peak power rating exceeds ISO 16750-2 Pulse 5a requirements by 20 %, ensuring margin for aging and temperature drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20CA | Lower PPPM (400 W vs. 3600 W); SMA package (RθJA = 95 °C/W vs. DO-218AC's 0.45 °C/W RθJM); same VWM/VBR range. | Not suitable for load dump; limited to ESD and low-energy transients in non-automotive consumer devices. | Select SMAJ20CA only for cost-sensitive, non-automotive applications with <500 W surge exposure and no AEC-Q101 requirement. |
| TPSMD20CA | Same DO-218AC package and 3600 W rating; tighter VBR tolerance (±3.5 % vs. ±5 %); slightly lower VC (31.8 V vs. 32.4 V). | Identical automotive load dump capability; preferred where tighter clamping consistency across production lot is required. | Choose TPSMD20CA when statistical clamping voltage distribution matters-e.g., safety-critical ADAS power domains with narrow voltage margins. |
Compared with SMAJ20CA and TPSMD20CA, SM5S20CAHM3/I delivers identical high-energy surge protection in the DO-218AC package but with AEC-Q101 qualification, HM3 halogen-free compliance, and documented ISO 7637-2 validation-making it the default choice for production automotive ECUs requiring full specification traceability.
Availability
SM5S20CAHM3/I is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, ADAS camera systems, and electric power steering designs requiring stable component supply with full AEC-Q101 traceability and ISO 7637-2 compliance.
Supply support for SM5S20CAHM3/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, optoelectronics, and passive components for automotive, industrial, and computing markets.
The SM5SxxCA family is engineered specifically for automotive-grade transient suppression, combining high-temperature operation, AEC-Q101 qualification, and DO-218AC thermal efficiency to replace legacy SMA/SMB solutions in next-generation ECUs.
FAQ
What is the maximum clamping voltage of SM5S20CAHM3/I under a 10/1000 μs surge?
The SM5S20CAHM3/I has a maximum clamping voltage (VC) of 32.4 V when subjected to its rated peak pulse current of 111 A with a 10/1000 μs waveform. This value is measured per Figure 4 in the Vishay datasheet 98458 and ensures downstream 3.3 V and 5 V ICs remain within safe operating voltage limits during automotive load dump events. The SM5S20CAHM3/I maintains this clamping performance across its full −55 °C to +175 °C operating junction temperature range.
Is SM5S20CAHM3/I compatible with lead-free reflow processes?
Yes, SM5S20CAHM3/I is qualified for lead-free reflow soldering with a maximum peak temperature of 245 °C per J-STD-020, meeting MSL Level 1 moisture sensitivity. Its matte tin-plated terminals comply with J-STD-002 for solderability, and the HM3 suffix confirms halogen-free, RoHS-compliant materials. The SM5S20CAHM3/I withstands standard Pb-free reflow profiles without delamination or parameter shift, supporting high-yield automotive manufacturing.
Does SM5S20CAHM3/I require a heatsink for standard automotive operation?
No discrete heatsink is required for SM5S20CAHM3/I in typical automotive applications because its DO-218AC package integrates a metal heatsink pad (Terminal 2) that must be soldered directly to ≥100 mm² of 2 oz. copper on the PCB. This achieves RθJM = 0.45 °C/W, allowing full 3600 W surge dissipation without external hardware. The SM5S20CAHM3/I relies entirely on PCB copper for thermal management-no bolted heatsink or thermal interface material is needed.
How does SM5S20CAHM3/I meet ISO 7637-2 load dump requirements?
SM5S20CAHM3/I is tested and specified to meet ISO 7637-2 Pulse 5a (load dump) and Pulse 5b (superimposed ripple) under high-temperature conditions up to TJ = 175 °C. Its 32.4 V clamping voltage at 111 A, 3600 W peak power rating, and AEC-Q101 qualification ensure sustained performance during the 35 V, 400 ms transient profile. The SM5S20CAHM3/I datasheet explicitly references ISO 7637-2 compliance in its FEATURES section and validates behavior across temperature extremes.
What is the meaning of the "HM3" and "/I" suffixes in SM5S20CAHM3/I?
The "HM3" suffix indicates halogen-free, RoHS-compliant construction with matte tin plating qualified to JESD 201 Class 2 for whisker resistance and AEC-Q101 for automotive reliability. The "/I" denotes the preferred packaging code: 750-unit 13-inch plastic tape-and-reel delivery with anode oriented toward the sprocket hole. Together, SM5S20CAHM3/I identifies the exact AEC-Q101-qualified, high-temperature, environmentally compliant variant of the SM5S20CA TVS diode supplied in industry-standard reel format.
SM5S20CAHM3/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):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 32.4V
- Current - Peak Pulse (10/1000µs):
- 111A
- 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
SM5S20CAHM3/I FAQ
1.How can I place an order for SM5S20CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM5S20CAHM3/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 SM5S20CAHM3/I reliable?
The price and inventory of SM5S20CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM5S20CAHM3/I is usually 5 days.
3.What payment methods are accepted for SM5S20CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM5S20CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM5S20CAHM3/I?
SM5S20CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM5S20CAHM3/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 SM5S20CAHM3/I?
For technical support, including SM5S20CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM5S20CAHM3/I requirements.
6.How does Aetrix verify that SM5S20CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SM5S20CAHM3/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 SM5S20CAHM3/I meets industry standards.
7.What is the process for return or replacement of SM5S20CAHM3/I?
All SM5S20CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM5S20CAHM3/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 SM5S20CAHM3/I part is unused and in its original packaging.
Return procedure for SM5S20CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM5S20CAHM3/I Tags
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