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Vishay General Semiconductor - Diodes Division SM8S70CAHM3/I
- Part No.:
- SM8S70CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM8S70CAHM3/I.pdf
- Description:
- 6600 W BI-DIRECTIONAL TVS IS DO-
- Quantity:
- Payment:
- Shipping:
Inventory:2,727
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Product details
Overview
SM8S70CAHM3/I from Vishay General Semiconductor is a bidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for automotive load dump protection. It features a 70 V stand-off voltage (VWM), 77.8–86.0 V breakdown voltage (VBR), 113 V maximum clamping voltage (VC) at 58.4 A peak pulse current, and 6600 W peak pulse power (10/1000 μs). Rated for TJ = 175 °C and AEC-Q101 qualified, it operates in DO-218AC package for high-reliability under-hood electronics.
For engineers reviewing the SM8S70CAHM3/I datasheet, SM8S70CAHM3/I pinout, SM8S70CAHM3/I application, or SM8S70CAHM3/I equivalent, key selection criteria include clamping performance under ISO 7637-2 load dump pulses, thermal stability at 175 °C junction temperature, bidirectional surge handling capability, and halogen-free, RoHS-compliant construction with MSL Level 1 rating.
Technical Context
This TVS diode uses silicon avalanche technology to provide fast-response overvoltage clamping during transients such as automotive load dump and inductive switching events. Its DO-218AC package integrates a metal heatsink terminal for low thermal resistance (RθJM = 0.35 °C/W) and high-power dissipation without external heatsinking.
The device is unidirectionally non-polarized - bidirectional operation requires no cathode marking - and meets stringent automotive reliability standards including AEC-Q101 qualification, JESD201 Class 2 whisker resistance, and UL 94 V-0 flammability rating of the molding compound.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - reverse stand-off voltage; defines maximum continuous operating voltage before significant leakage begins |
| VBR (min/typ/max) | 77.8 / 81.9 / 86.0 V - breakdown threshold range at 5 mA test current; ensures consistent turn-on across production lots |
| VC @ IPPM | 113 V at 58.4 A - clamping voltage under 10/1000 μs surge; limits downstream IC stress during load dump events |
| PPPM (10/1000 μs) | 6600 W - peak pulse power handling; supports high-energy transients per ISO 7637-2 Pulse 5a |
| TJ max | +175 °C - maximum junction temperature; enables under-hood placement without derating in hot ambient conditions |
| Package | DO-218AC - surface-mount package with integrated metal heatsink terminal; optimized for thermal transfer and mechanical robustness |
| Polarity | Bidirectional - symmetrical clamping for AC or dual-polarity DC systems; no polarity marking required on body |
Pinout & Package
SM8S70CAHM3/I is housed in the DO-218AC package - a surface-mount, bidirectional TVS configuration with two terminals: Terminal 1 (anode/cathode indistinct) and Terminal 2 (metal heatsink pad). The heatsink pad serves as both electrical connection and primary thermal path to PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode/Cathode (bidirectional) | Electrically interchangeable terminal; forms one side of the avalanche junction; soldered to signal/power trace |
| Terminal 2 (Metal Heatsink) | Common reference / thermal path | Low-inductance, high-current return path and primary thermal conduction interface to PCB ground plane or thermal pad |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JEDEC standards |
| MSL Level 1 (245 °C peak) | Enables standard SMT reflow without moisture sensitivity concerns; eliminates bake requirement prior to assembly |
| Junction-to-mount thermal resistance (RθJM) | 0.35 °C/W - enables >8 W steady-state dissipation when mounted on ≥1 in² 2 oz. copper pad |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets global environmental compliance mandates without compromising surge robustness or thermal performance |
| ISO 7637-2 & ISO 16750-2 compliance | Validated for automotive transient immunity requirements including load dump (Pulse 5a), jump start, and alternator ripple |
Applications
| Automotive Load Dump Protection | Industrial Power Supply Input Clamping |
|---|---|
Use Scenario: 12 V/24 V vehicle electrical system subjected to alternator load dump transients up to 120 V for 400 ms. IC Role / Device Role / Timing Role: Primary clamping element placed at battery input of ECUs, ADAS modules, and infotainment head units. Use Value: Limits voltage seen by downstream DC-DC converters and microcontrollers to ≤113 V, preventing latch-up or permanent damage. | Use Scenario: 24 V industrial PLC power input exposed to inductive switching surges from solenoid valves and motor drivers. IC Role / Device Role / Timing Role: Front-end transient suppression before input filter and rectification stage. Use Value: Absorbs 6600 W surges without degradation, maintaining system uptime and reducing need for oversized input capacitors. |
| Telecom Power Interface Protection | Renewable Energy Charge Controller Input |
Use Scenario: Remote telecom base station powered via PoE++ or centralized DC plant, subject to lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Secondary-level surge protector after gas discharge tube (GDT) or primary MOV. Use Value: Provides low-clamping, fast-response backup protection with <1 ns response time to complement slower primary protectors. | Use Scenario: Solar charge controller input connected to photovoltaic arrays experiencing rapid voltage transients due to partial shading or arc faults. IC Role / Device Role / Timing Role: DC bus overvoltage clamp between PV array and MPPT converter input. Use Value: Withstands repeated 10/1000 μs surges up to 58.4 A while maintaining stable VWM over 175 °C junction temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ70A-E3/5A (Vishay) | DO-214AC package; lower PPPM (400 W); VWM = 70 V; VC = 113 V; not AEC-Q101 qualified | Suitable for commercial-grade power supplies but lacks automotive qualification and thermal robustness | Select when cost sensitivity outweighs automotive reliability requirements and surge energy is ≤400 W |
| TPSMD70A (Texas Instruments) | DO-218AC package; same VWM/VC; PPPM = 6600 W; AEC-Q101 qualified; RθJM = 0.45 °C/W (vs. 0.35 °C/W) | Compatible footprint and electrical specs; slightly higher thermal resistance affects sustained surge margin | Acceptable drop-in alternative where minor thermal derating is acceptable and TI supply chain preference applies |
Compared with SMAJ70A-E3/5A and TPSMD70A, SM8S70CAHM3/I delivers superior thermal performance (RθJM = 0.35 °C/W), guaranteed AEC-Q101 qualification, and identical clamping behavior - making it the preferred choice for high-reliability automotive and industrial deployments requiring repeatable 6600 W surge handling.
Availability
SM8S70CAHM3/I is available at Aetrix Electronics and suitable for automotive ECU protection, industrial PLC input stages, telecom power interfaces, and renewable energy charge controllers requiring stable component supply across extended temperature and surge stress conditions.
Supply support for SM8S70CAHM3/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 diodes, MOSFETs, optoelectronics, and passive components with emphasis on reliability, efficiency, and application-specific optimization.
The SM8SxxCA family is engineered for high-energy transient suppression in harsh environments - specifically targeting automotive load dump, industrial power rail protection, and ISO 16750-2 compliant systems where 175 °C operation and AEC-Q101 validation are mandatory.
FAQ
What is the clamping voltage of SM8S70CAHM3/I at its rated peak pulse current?
The SM8S70CAHM3/I has a maximum clamping voltage (VC) of 113 V at 58.4 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured per Figure 4 in the Vishay datasheet (Doc #98229) and represents the upper limit of voltage imposed on protected circuitry during worst-case surge events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is SM8S70CAHM3/I suitable for automotive under-hood applications?
Yes, SM8S70CAHM3/I is explicitly qualified to AEC-Q101 and rated for TJ = 175 °C operation, making it suitable for under-hood automotive applications such as engine control units, transmission control modules, and ADAS sensors. Its DO-218AC package provides robust thermal conduction, and it meets ISO 7637-2 Pulse 5a load dump requirements - all confirmed in Vishay's official documentation.
Does SM8S70CAHM3/I have polarity markings on the package?
No, SM8S70CAHM3/I is a bidirectional TVS diode and carries no cathode band or polarity marking. The DO-218AC package features symmetric terminals - Terminal 1 and Terminal 2 (metal heatsink) - with identical avalanche characteristics in both directions. This simplifies PCB layout and eliminates orientation errors during automated assembly.
What is the meaning of the "HM3" and "/I" suffixes in SM8S70CAHM3/I?
The "HM3" suffix indicates AEC-Q101 qualification (H), halogen-free/RoHS-compliant construction with matte tin terminations (M3), and JESD201 Class 2 whisker resistance. The "/I" denotes tape-and-reel packaging in 13-inch reels with 750 units per reel and anode-first orientation - per Vishay's ordering information table in document 98229.
How does SM8S70CAHM3/I compare to standard SMAJ series TVS diodes in surge capability?
SM8S70CAHM3/I delivers 6600 W peak pulse power (10/1000 μs), over 16× higher than the SMAJ70A's 400 W rating. It also features lower RθJM (0.35 vs. ~20 °C/W), enabling effective heat dissipation in high-power surge events. Unlike SMAJ devices, SM8S70CAHM3/I is AEC-Q101 qualified and specified for 175 °C operation - confirming its suitability for mission-critical automotive use where SMAJ parts are limited to commercial applications.
SM8S70CAHM3/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):
- 70V
- Voltage - Breakdown (Min):
- 77.8V
- Voltage - Clamping (Max) @ Ipp:
- 113V
- Current - Peak Pulse (10/1000µs):
- 58.4A
- 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
SM8S70CAHM3/I FAQ
1.How can I place an order for SM8S70CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8S70CAHM3/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 SM8S70CAHM3/I reliable?
The price and inventory of SM8S70CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM8S70CAHM3/I is usually 5 days.
3.What payment methods are accepted for SM8S70CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8S70CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8S70CAHM3/I?
SM8S70CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8S70CAHM3/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 SM8S70CAHM3/I?
For technical support, including SM8S70CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8S70CAHM3/I requirements.
6.How does Aetrix verify that SM8S70CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SM8S70CAHM3/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 SM8S70CAHM3/I meets industry standards.
7.What is the process for return or replacement of SM8S70CAHM3/I?
All SM8S70CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM8S70CAHM3/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 SM8S70CAHM3/I part is unused and in its original packaging.
Return procedure for SM8S70CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM8S70CAHM3/I Tags
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