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Vishay General Semiconductor - Diodes Division SM5S17CAHM3/I
- Part No.:
- SM5S17CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM5S17CAHM3/I.pdf
- Description:
- 3600 W BI-DIRECTIONAL TVS IS DO-
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
SM5S17CAHM3/I from Vishay General Semiconductor is a bidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for automotive load dump protection. It features a 17.0 V stand-off voltage (VWM), 18.9–20.9 V breakdown voltage (VBR), 27.6 V maximum clamping voltage at 130 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 electronics.
For engineers reviewing the SM5S17CAHM3/I datasheet, SM5S17CAHM3/I pinout, SM5S17CAHM3/I application, or SM5S17CAHM3/I equivalent, this device is selected for high-reliability 12 V automotive power rail protection where low leakage (<10 µA at VWM), high surge immunity (ISO 7637-2 compliant), and DO-218AC package thermal performance are critical.
Technical Context
This TVS diode uses an avalanche-based silicon junction to clamp transient overvoltages before they damage downstream circuitry. Its bidirectional structure enables symmetrical suppression of both positive and negative transients without polarity marking. The DO-218AC case provides low thermal resistance (RθJM = 0.45 °C/W) and supports 175 °C junction operation.
It delivers 3600 W peak pulse power with 10/1000 µs waveform and maintains stable clamping up to 175 °C ambient - validated per AEC-Q101 stress tests including temperature cycling, HTRB, and ESD. Its MSL Level 1 rating and matte tin terminations ensure robust reflow compatibility.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 17.0 V - reverse stand-off voltage; defines maximum continuous operating voltage before conduction begins |
| VBR (min–max) | 18.9–20.9 V - breakdown voltage range at 5 mA test current; ensures reliable turn-on margin above VWM |
| VC @ IPPM | 27.6 V at 130 A - clamping voltage during 10/1000 µs surge; limits voltage seen by protected ICs |
| PPPM (10/1000 µs) | 3600 W - peak pulse power handling; sustains high-energy load dump events without failure |
| ID @ VWM | <10 µA at 25 °C - ultra-low leakage preserves battery drain budget in always-on automotive modules |
| TJ max. | +175 °C - extended junction temperature rating enables placement near hot engine compartments |
| Package | DO-218AC - thermally enhanced surface-mount case with metal heatsink terminal and UL 94 V-0 molding |
Pinout & Package
SM5S17CAHM3/I is housed in a DO-218AC package with two terminals: Terminal 1 (anode side) and Terminal 2 (metal heatsink/cathode side). The device is bidirectional and has no cathode band; polarity is irrelevant for transient suppression function. The metal heatsink terminal provides low-inductance, low-resistance path to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode connection | Connected to protected line (e.g., battery rail); forms one side of bidirectional avalanche junction |
| Terminal 2 | Metal heatsink / common terminal | Low-thermal-resistance path to PCB copper pour; serves as return for both polarities of transient current |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive under-hood use via temperature cycling, HTRB, and mechanical shock testing |
| MSL Level 1 rating | Supports lead-free reflow up to 245 °C peak without moisture-induced damage |
| Halogen-free & RoHS-compliant (M3) | Meets global environmental regulations and JESD201 Class 2 whisker resistance |
| ISO 7637-2 compliance | Withstands automotive load dump pulses (Test Pulse 5a) without degradation |
| 175 °C junction capability | Enables direct mounting on high-temperature PCB zones without derating penalties |
Applications
| Engine Control Unit (ECU) Power Input | Body Control Module (BCM) Battery Rail |
|---|---|
Use Scenario: Protects microcontroller power supply against alternator load dump spikes during battery disconnection. IC Role / Device Role / Timing Role: Bidirectional TVS clamps ±120 V transients within 1 ns to limit rail voltage to ≤27.6 V. Use Value: Prevents latch-up or permanent damage to 5 V/3.3 V regulators and CAN transceivers downstream. | Use Scenario: Shields LIN bus interface and door lock drivers from switching noise and jump-start surges. IC Role / Device Role / Timing Role: Fast-response voltage clamp absorbs repetitive 10/1000 µs pulses up to 3600 W without parameter shift. Use Value: Maintains system uptime in 12 V vehicle architectures where BCM operates continuously across ignition cycles. |
| Advanced Driver Assistance Systems (ADAS) Camera Power | Electric Power Steering (EPS) Motor Driver Supply |
Use Scenario: Safeguards image sensor and ISP power rails from EMI-coupled transients during HVAC actuator switching. IC Role / Device Role / Timing Role: Low-leakage (<10 µA) TVS avoids parasitic current draw that could disrupt always-on camera wake logic. Use Value: Enables ASIL-B compliant power integrity without adding active supervision circuitry. | Use Scenario: Suppresses inductive kickback from H-bridge MOSFETs during EPS motor commutation. IC Role / Device Role / Timing Role: Metal heatsink terminal conducts >90 % of surge current directly to ground plane, minimizing PCB trace inductance impact. Use Value: Reduces need for oversized bulk capacitance and improves EMC performance in safety-critical steering systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ17CA | DO-214AC package; lower PPPM (400 W); higher RθJA (100 °C/W); same VWM/VBR range | Not AEC-Q101 qualified; limited to industrial/commercial ambient (TJ ≤ 150 °C) | Select SMAJ17CA only for cost-sensitive non-automotive designs where 3600 W surge immunity is not required. |
| TPSMD17CA | DO-218AC package; identical VWM/VBR/VC specs; 3600 W PPPM; AEC-Q101 qualified; slightly higher ID (25 µA @ VWM) | Same automotive use cases; minor leakage trade-off for broader manufacturer availability | TPSMD17CA offers second-source flexibility while maintaining thermal and surge performance parity with SM5S17CAHM3/I. |
Compared with SMAJ17CA and TPSMD17CA, SM5S17CAHM3/I delivers superior thermal management (RθJM = 0.45 °C/W), tighter leakage control (<10 µA), and guaranteed AEC-Q101 compliance - making it the preferred choice for high-temperature, high-reliability automotive power rail protection.
Availability
SM5S17CAHM3/I is available at Aetrix Electronics and suitable for automotive ECU protection, body control module design, and ADAS camera power conditioning requiring stable component supply across long production lifecycles.
Supply support for SM5S17CAHM3/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 SM5SxxCA family was engineered specifically for automotive-grade transient suppression - combining high-temperature stability, AEC-Q101 qualification, and DO-218AC thermal efficiency to replace legacy axial and smaller SMT TVS solutions in next-generation vehicle electronics.
FAQ
What is the maximum clamping voltage of SM5S17CAHM3/I at its rated peak pulse current?
The SM5S17CAHM3/I has a maximum clamping voltage (VC) of 27.6 V when subjected to its specified 130 A peak pulse current (IPPM) under the 10/1000 µs waveform condition. This value is measured per Figure 4 in the Vishay datasheet and ensures downstream components see no more than 27.6 V during worst-case transients. The clamping performance remains stable across the full −55 °C to +175 °C operating junction temperature range.
Is SM5S17CAHM3/I suitable for 24 V commercial vehicle applications?
SM5S17CAHM3/I is rated for 17.0 V stand-off and optimized for 12 V automotive systems. For 24 V applications, Vishay recommends SM5S33CAHM3/I (33.0 V VWM) or SM5S36CAHM3/I (36.0 V VWM) to maintain adequate margin above nominal rail voltage. Using SM5S17CAHM3/I on a 24 V bus would cause continuous conduction and thermal failure due to exceeding VWM by >40 %.
Does SM5S17CAHM3/I require a heatsink on the PCB?
SM5S17CAHM3/I does not require an external heatsink but relies on proper PCB layout: its DO-218AC metal heatsink terminal must be connected to a minimum 100 mm² copper pour (2 oz. thickness) to achieve rated 3600 W pulse power. The datasheet specifies RθJM = 0.45 °C/W into the board - meaning thermal performance is achieved through direct metal-to-copper conduction, not air-cooled finned heatsinks.
What does the "HM3/I" suffix mean in SM5S17CAHM3/I?
The "HM3/I" suffix in SM5S17CAHM3/I decodes as follows: H = AEC-Q101 qualified; M3 = halogen-free, RoHS-compliant, Pb-free termination with JESD201 Class 2 whisker resistance; I = 13″ plastic tape and reel packaging with anode orientation toward sprocket hole. This full suffix confirms automotive-grade material, reliability, and assembly-ready packaging per Vishay's ordering matrix.
How does SM5S17CAHM3/I compare to older SMAJ series TVS diodes in surge handling?
SM5S17CAHM3/I delivers 3600 W peak pulse power (10/1000 µs), nine times higher than SMAJ17CA's 400 W rating. Its DO-218AC package achieves 0.45 °C/W junction-to-mount thermal resistance versus SMAJ's ~100 °C/W junction-to-ambient - enabling sustained surge absorption without thermal runaway. This makes SM5S17CAHM3/I capable of surviving repeated load dump events where SMAJ17CA would fail catastrophically.
SM5S17CAHM3/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):
- 17V
- Voltage - Breakdown (Min):
- 18.9V
- Voltage - Clamping (Max) @ Ipp:
- 27.6V
- Current - Peak Pulse (10/1000µs):
- 130A
- 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
SM5S17CAHM3/I FAQ
1.How can I place an order for SM5S17CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM5S17CAHM3/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 SM5S17CAHM3/I reliable?
The price and inventory of SM5S17CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM5S17CAHM3/I is usually 5 days.
3.What payment methods are accepted for SM5S17CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM5S17CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM5S17CAHM3/I?
SM5S17CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM5S17CAHM3/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 SM5S17CAHM3/I?
For technical support, including SM5S17CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM5S17CAHM3/I requirements.
6.How does Aetrix verify that SM5S17CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SM5S17CAHM3/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 SM5S17CAHM3/I meets industry standards.
7.What is the process for return or replacement of SM5S17CAHM3/I?
All SM5S17CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM5S17CAHM3/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 SM5S17CAHM3/I part is unused and in its original packaging.
Return procedure for SM5S17CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM5S17CAHM3/I Tags
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DESD3V3E1BL-7B
Diodes Incorporated
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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