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Vishay General Semiconductor - Diodes Division SM8S16CAHM3/I
- Part No.:
- SM8S16CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM8S16CAHM3/I.pdf
- Description:
- 6600 W BI-DIRECTIONAL TVS IS DO-
- Quantity:
- Payment:
- Shipping:
Inventory:1,260
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Product details
Overview
SM8S16CAHM3/I from Vishay General Semiconductor is a bidirectional surface-mount PAR® transient voltage suppressor (TVS) in DO-218AC package, rated for 16 V stand-off voltage (VWM), 17.8–19.7 V breakdown (VBR), and 26.0 V clamping voltage (VC) at 254 A peak pulse current (IPPM) under 10/1000 μs waveform. It delivers 6600 W peak pulse power and operates up to TJ = 175 °C, targeting automotive load dump protection.
For engineers reviewing the SM8S16CAHM3/I datasheet, SM8S16CAHM3/I pinout, SM8S16CAHM3/I application, or SM8S16CAHM3/I equivalent, this device is selected for high-reliability 12 V automotive power rail surge suppression where ISO 7637-2 and AEC-Q101 compliance are mandatory.
Technical Context
This TVS diode uses silicon avalanche junction technology optimized for fast response (<1 ns) to transients induced by inductive switching and load dump events. Its bidirectional configuration enables symmetrical clamping without polarity dependency, and its DO-218AC package integrates a metal heatsink terminal for low thermal resistance (RθJM = 0.35 °C/W).
The device sustains 15 μA max reverse leakage at VWM = 16 V and 10 μA at TJ = 175 °C, supporting stable operation across extended temperature ranges. Its 6600 W PPPM rating applies specifically to the 10/1000 μs waveform, with derating above TA = 25 °C per JEDEC 51-2A on FR4 PCB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 16.0 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC bias margin for 12 V automotive systems. |
| VBR (min) | 17.8 V - Minimum breakdown voltage at 5 mA test current; ensures reliable turn-on above normal system overvoltage thresholds. |
| VC @ IPPM | 26.0 V - Clamped voltage at 254 A peak pulse current; limits downstream IC stress during ISO 7637-2 Pulse 5a load dump events. |
| PPPM (10/1000 μs) | 6600 W - Peak pulse power handling capacity; enables single-device protection against high-energy transients without external series impedance. |
| TJ max | +175 °C - Maximum junction temperature; supports under-hood placement in engine control units and body control modules. |
| Leakage @ VWM | 15 μA at 25 °C - Low standby current minimizes parasitic drain in always-on vehicle networks like CAN/LIN. |
Pinout & Package
Package: DO-218AC - Surface-mount, bidirectional TVS with integrated metal heatsink terminal (Lead 2), matte tin-plated leads, MSL Level 1, halogen-free, RoHS-compliant, AEC-Q101 qualified.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Anode / Cathode (bidirectional) | No polarity marking; symmetric terminals enable orientation-agnostic PCB layout and eliminate assembly errors. |
| Lead 2 / Metal Heatsink | Thermal & Electrical Common Terminal | Low-inductance metal slug provides primary thermal path to PCB copper and serves as common reference node for clamping action. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, humidity testing, and mechanical shock per JESD22 standards. |
| ISO 7637-2 compliance | Meets Pulse 5a (load dump) requirements up to 35 V/100 ms, enabling direct integration into 12 V battery rail protection circuits. |
| RθJM = 0.35 °C/W | Enables efficient heat transfer from junction to mounting pad, supporting sustained 8.0 W steady-state dissipation on standard FR4 layouts. |
| MSL Level 1 rating | Allows unlimited floor life and reflow at peak 245 °C without moisture-induced failure, simplifying SMT manufacturing flow. |
Applications
| Automotive Load Dump Protection | Engine Control Unit (ECU) Power Input |
|---|---|
Use Scenario: Protecting 12 V power inputs of vehicle ECUs during alternator load dump events per ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Primary clamping device placed directly at power entry point to limit transient voltage to ≤26.0 V. Use Value: Prevents latch-up or permanent damage to microcontrollers and analog front-ends by clamping within 1 ns while sustaining 6600 W surge energy. |
Use Scenario: Safeguarding power supply rails of gasoline/diesel engine control modules exposed to cranking transients and ignition noise. IC Role / Device Role / Timing Role: Bidirectional TVS suppressing both positive and negative spikes on switched 12 V lines feeding fuel injector drivers and sensor interfaces. Use Value: Eliminates need for dual unidirectional devices; 15 μA leakage avoids battery drain in key-off monitoring states. |
| Body Control Module (BCM) Power Rail | ADAS Camera Power Interface |
Use Scenario: Securing power inputs of BCMs managing lighting, door locks, and HVAC in modern vehicles with centralized architecture. IC Role / Device Role / Timing Role: High-energy TVS absorbing repetitive switching surges from relay coils and motor loads connected to same power bus. Use Value: Withstands ≥150 pulses at rated IPPM without parameter shift, ensuring long-term robustness in 15-year vehicle lifecycles. |
Use Scenario: Protecting 12 V input of rear-view or surround-view cameras mounted near bumpers subject to ESD and lightning-induced surges. IC Role / Device Role / Timing Role: First-line transient suppressor upstream of DC/DC converters and image sensors, meeting ISO 16750-2 Class III immunity. Use Value: 26.0 V clamping voltage preserves headroom for downstream LDOs supplying 3.3 V image processors without overvoltage risk. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ16A-E3/5A | Unidirectional; lower PPPM (400 W); SMA package; RθJA = 110 °C/W; no AEC-Q101 qualification. | Limited to non-automotive, low-energy consumer or industrial I/O protection; unsuitable for load dump. | Select only for cost-sensitive, non-automotive designs where bidirectionality and 6600 W surge capability are unnecessary. |
| TPSMD16CA | Bidirectional; same VWM/VBR/VC specs; DO-218AC package; AEC-Q101 qualified; but PPPM = 5000 W (10/10k μs), not 6600 W (10/1000 μs). | Acceptable for ISO 16750-2 but marginal for ISO 7637-2 Pulse 5a due to lower short-duration power rating. | Use when thermal budget allows higher clamping voltage tolerance or when 10/10k μs surge profile dominates system threat model. |
Compared with SMAJ16A-E3/5A and TPSMD16CA, the SM8S16CAHM3/I uniquely combines AEC-Q101 qualification, 6600 W 10/1000 μs PPPM, and DO-218AC thermal performance-making it the only option among the three validated for full ISO 7637-2 load dump compliance in production automotive ECUs.
Availability
SM8S16CAHM3/I is available at Aetrix Electronics and suitable for automotive load dump protection, engine control unit (ECU) power input hardening, and body control module (BCM) power rail stabilization requiring stable component supply across multi-year vehicle production cycles.
Supply support for SM8S16CAHM3/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 SM8SxxCA family is engineered specifically for automotive-grade transient suppression, emphasizing AEC-Q101 qualification, high-temperature operation (TJ = 175 °C), and ISO 7637-2 compliance in ruggedized DO-218AC packaging.
FAQ
What is the clamping voltage of the SM8S16CAHM3/I at its rated peak pulse current?
The SM8S16CAHM3/I has a maximum clamping voltage (VC) of 26.0 V at its rated peak pulse current (IPPM) of 254 A under the 10/1000 μs waveform. This value is measured per Figure 4 in the Vishay datasheet 98229 and defines the upper voltage limit imposed on protected circuitry during worst-case surge events such as automotive load dump. The SM8S16CAHM3/I maintains this clamping performance consistently across its qualified temperature range.
Is the SM8S16CAHM3/I suitable for ISO 7637-2 Pulse 5a compliance?
Yes, the SM8S16CAHM3/I is explicitly designed and tested to meet ISO 7637-2 Pulse 5a (load dump) requirements. Its 6600 W peak pulse power rating at 10/1000 μs, 26.0 V clamping voltage, and AEC-Q101 qualification confirm suitability for protecting 12 V automotive power rails. System-level validation per ISO 7637-2 requires proper PCB layout and grounding-but the SM8S16CAHM3/I itself satisfies all component-level criteria specified in the standard.
Does the SM8S16CAHM3/I have polarity markings on the package?
No, the SM8S16CAHM3/I is a bidirectional TVS diode housed in a DO-218AC package with no cathode band or polarity marking. Its symmetrical construction means either lead may serve as anode or cathode depending on transient polarity-enabling flexible, error-proof PCB placement. This eliminates orientation-dependent assembly risks and simplifies layout in space-constrained automotive modules.
What is the thermal resistance from junction to mount (RθJM) for the SM8S16CAHM3/I?
The SM8S16CAHM3/I has a typical thermal resistance from junction to mount (RθJM) of 0.35 °C/W, measured using the Transient Dual Interface Test Method (TDIM) per JEDEC 51-14. This low value results from its integrated metal heatsink terminal (Lead 2), which provides a direct thermal path to the PCB copper pour. It enables effective heat dissipation during repeated surge events and supports 8.0 W steady-state power dissipation on standard FR4 layouts.
How does the SM8S16CAHM3/I differ from standard SMAJ-series TVS diodes?
The SM8S16CAHM3/I differs from SMAJ-series devices in three critical ways: it uses the DO-218AC package (not SMA), delivers 6600 W PPPM (vs. ≤400 W for SMAJ16A), and is AEC-Q101 qualified (SMAJ parts are not). These distinctions make the SM8S16CAHM3/I suitable for under-hood automotive applications requiring high surge energy absorption, high-temperature operation up to 175 °C, and certified reliability-whereas SMAJ devices target general-purpose, non-automotive use cases.
SM8S16CAHM3/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):
- 16V
- Voltage - Breakdown (Min):
- 17.8V
- Voltage - Clamping (Max) @ Ipp:
- 26V
- Current - Peak Pulse (10/1000µs):
- 254A
- Power - Peak Pulse:
- 6600W (6.6kW)
- 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
SM8S16CAHM3/I FAQ
1.How can I place an order for SM8S16CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8S16CAHM3/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 SM8S16CAHM3/I reliable?
The price and inventory of SM8S16CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM8S16CAHM3/I is usually 5 days.
3.What payment methods are accepted for SM8S16CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8S16CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8S16CAHM3/I?
SM8S16CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8S16CAHM3/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 SM8S16CAHM3/I?
For technical support, including SM8S16CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8S16CAHM3/I requirements.
6.How does Aetrix verify that SM8S16CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SM8S16CAHM3/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 SM8S16CAHM3/I meets industry standards.
7.What is the process for return or replacement of SM8S16CAHM3/I?
All SM8S16CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM8S16CAHM3/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 SM8S16CAHM3/I part is unused and in its original packaging.
Return procedure for SM8S16CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM8S16CAHM3/I Tags
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