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Vishay General Semiconductor - Diodes Division SM8S64CAHM3/I
- Part No.:
- SM8S64CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM8S64CAHM3/I.pdf
- Description:
- 6600 W BI-DIRECTIONAL TVS IS DO-
- Quantity:
- Payment:
- Shipping:
Inventory:2,900
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Product details
Overview
SM8S64CAHM3/I from Vishay General Semiconductor is a bidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for automotive load dump protection. It features a 71.1–78.6 V breakdown voltage (VBR), 64.0 V stand-off voltage (VWM), 103 V maximum clamping voltage (VC) at 64.1 A peak pulse current, and 6600 W peak pulse power (10/1000 µs). Rated for TJ = 175 °C and AEC-Q101 qualified, it is used in 12 V/24 V automotive power rail protection.
For engineers reviewing the SM8S64CAHM3/I datasheet, SM8S64CAHM3/I pinout, SM8S64CAHM3/I application, or SM8S64CAHM3/I equivalent, this page delivers verified electrical parameters, DO-218AC package details, ISO 7637-2 compliance evidence, thermal resistance data (RθJA = 55 °C/W), and direct alternative part comparisons for high-reliability automotive circuit design.
Technical Context
This TVS diode operates as a bidirectional clamping device with no cathode band, enabling symmetrical surge suppression on DC power lines. Its junction passivation ensures RoHS compliance and stability up to 175 °C junction temperature, meeting automotive-grade reliability requirements under high-temperature ambient conditions.
The device delivers 6600 W peak pulse power handling with 10/1000 µs waveform and 5200 W with 10/10 000 µs waveform - validated per IEC 61000-4-5 and aligned with ISO 16750-2 test conditions. Its low leakage (<10 µA at VWM, <15 µA at TJ = 175 °C) minimizes standby power loss in always-on vehicle systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/typ/max) | 71.1 / 74.9 / 78.6 V - ensures reliable triggering above nominal 64 V system transients without false clamping |
| VWM | 64.0 V - matches 24 V automotive battery systems with margin against normal operating overvoltage |
| VC @ IPPM | 103 V - limits downstream IC stress during 64.1 A surge, preserving 40 V+ headroom for 12 V/24 V electronics |
| PPPM (10/1000 µs) | 6600 W - sustains ISO 7637-2 Load Dump Pulse 5a (12 V) and Pulse 5b (24 V) without failure |
| TJ max | 175 °C - enables placement near high-power modules (e.g., ECUs, ADAS controllers) without derating |
| Leakage @ VWM | <10 µA @ 25 °C - avoids parasitic drain in always-on CAN/LIN bus nodes and telematics modules |
| MSL Level | Level 1 (J-STD-020) - supports standard SMT reflow without moisture sensitivity concerns |
Pinout & Package
Package: DO-218AC - thermally enhanced surface-mount case with metal heatsink terminal (Lead 2), UL 94 V-0 molding compound, matte tin-plated leads, and JESD 201 Class 2 whisker resistance. Compatible with IPC 7351 footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Anode (bidirectional) | Connected to protected line; polarity-agnostic due to symmetrical structure |
| Lead 2 / Metal Heatsink | Cathode / Thermal Path | Primary thermal conduction path to PCB copper; must be soldered to large copper pour for RθJM = 0.35 °C/W performance |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use across temperature, humidity, vibration, and lifetime stress tests per JEDEC standards |
| ISO 7637-2 & ISO 16750-2 compliance | Meets Pulse 1, 2a, 3a/b, and critical Load Dump Pulse 5a/5b waveforms without external circuitry |
| DO-218AC metal heatsink | Enables 8.0 W steady-state power dissipation and reduces thermal impedance by >90% vs. DO-214AB |
| Halogen-free, RoHS-compliant (M3) | Meets automotive material restrictions (ELV, IMDS) and supports lead-free assembly at 245 °C peak |
| Bidirectional symmetry | Eliminates orientation errors during automated placement and supports AC-coupled or floating-rail applications |
Applications
| Engine Control Unit (ECU) Power Input | Body Control Module (BCM) Battery Rail |
|---|---|
Use Scenario: Protects microcontroller, CAN transceivers, and sensor interfaces from load dump spikes during alternator regulation failure. IC Role / Device Role: Primary clamping element placed directly at 24 V input connector before bulk capacitance and LDOs. Use Value: Limits voltage to ≤103 V during 100 ms, 30 V load dump event, preventing latch-up or gate oxide damage in downstream 3.3 V/5 V logic. |
Use Scenario: Shields LIN bus transceivers, door lock actuators, and lighting drivers from battery reversal and jump-start surges. IC Role / Device Role: Bidirectional TVS on main 12 V supply rail, co-located with fuse and reverse-polarity MOSFET. Use Value: Withstands ±100 V, 10/1000 µs pulses per ISO 16750-2 while maintaining <10 µA leakage for low-power sleep modes. |
| Advanced Driver Assistance Systems (ADAS) Camera Power | Electric Power Steering (EPS) Motor Driver |
Use Scenario: Safeguards image sensor and ISP power rails in front-facing cameras exposed to engine bay thermal cycling and EMI. IC Role / Device Role: Secondary TVS after primary filter stage, placed adjacent to camera module's DC-DC converter input. Use Value: 175 °C rating allows operation at 125 °C ambient with full 6600 W surge capacity, ensuring reliability in under-hood mounting. |
Use Scenario: Protects H-bridge gate drivers and current sense amplifiers from inductive kickback during motor commutation. IC Role / Device Role: Clamping device on 12 V auxiliary supply feeding MCU and driver ICs, located near motor controller PCB edge. Use Value: 5200 W capability at 10/10 000 µs waveform absorbs sustained energy from PWM-induced back-EMF without thermal runaway. |
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 SMAJ64CA | DO-214AC package; lower PPPM = 400 W (10/1000 µs); VC = 103 V at 38.9 A | Limited to low-energy transients (e.g., ESD, minor switching noise); not rated for ISO 7637-2 Load Dump | Select when cost-sensitive, non-automotive designs require basic clamping with smaller footprint. |
| ON Semiconductor SMCJ64CA | DO-214AB package; PPPM = 1500 W (10/1000 µs); VC = 103 V at 14.5 A; RθJA = 15 °C/W | Suitable for industrial 24 V systems but lacks AEC-Q101 qualification and 175 °C rating | Choose for commercial-grade embedded systems where automotive qualification and extreme thermal performance are not required. |
Compared with SMAJ64CA and SMCJ64CA, the SM8S64CAHM3/I provides 4.4× higher surge power, integrated metal heatsink for thermal management, and full AEC-Q101/ISO 7637-2 compliance - making it the only option qualified for under-hood automotive load dump protection.
Availability
SM8S64CAHM3/I is available at Aetrix Electronics and suitable for automotive ECU power protection, ADAS camera power conditioning, and electric power steering control modules requiring stable component supply across extended temperature and surge environments.
Supply support for SM8S64CAHM3/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 SM8S series is engineered specifically for automotive-grade transient suppression, targeting load dump, ISO 7637-2, and ISO 16750-2 compliance in engine control, body electronics, and ADAS subsystems.
FAQ
What is the clamping voltage of SM8S64CAHM3/I at its rated peak pulse current?
The SM8S64CAHM3/I has a maximum clamping voltage (VC) of 103 V at its specified peak pulse current (IPPM) of 64.1 A under 10/1000 µs waveform conditions. This value is measured per Figure 4 in the Vishay datasheet (Doc #98229) and defines the upper voltage limit imposed on protected circuits during worst-case surge events. The SM8S64CAHM3/I maintains this clamping performance across its full operating temperature range.
Is SM8S64CAHM3/I qualified for automotive applications?
Yes, the SM8S64CAHM3/I is AEC-Q101 qualified and explicitly designed for automotive use. It meets ISO 7637-2 and ISO 16750-2 surge immunity standards, operates up to 175 °C junction temperature, and carries the HM3 suffix indicating halogen-free, RoHS-compliant, and whisker-resistant construction. These attributes make SM8S64CAHM3/I suitable for under-hood and safety-critical vehicle systems.
What package does SM8S64CAHM3/I use, and why is it significant?
The SM8S64CAHM3/I uses the DO-218AC package, which integrates a metal heatsink terminal (Lead 2) for superior thermal conduction. This design achieves RθJM = 0.35 °C/W - over 90% lower than standard DO-214 packages - enabling 8.0 W steady-state power dissipation and robust 6600 W surge handling. The DO-218AC footprint is defined per IPC 7351 and supports high-current PCB layout with minimal thermal derating.
How does SM8S64CAHM3/I compare to standard SMAJ or SMCJ series TVS diodes?
The SM8S64CAHM3/I delivers 4.4× higher peak pulse power (6600 W vs. 1500 W for SMCJ64CA) and uses a thermally optimized DO-218AC package instead of DO-214AB/AC. Unlike SMAJ64CA, it is AEC-Q101 qualified, rated for 175 °C operation, and validated for ISO 7637-2 Load Dump. These differences make SM8S64CAHM3/I uniquely capable for demanding automotive power rail protection where reliability and energy absorption are critical.
What is the leakage current specification for SM8S64CAHM3/I at maximum operating temperature?
At VWM = 64.0 V and TJ = 175 °C, the SM8S64CAHM3/I exhibits a maximum reverse leakage current (ID) of 15 µA. This value is confirmed in Table "ELECTRICAL CHARACTERISTICS" of the Vishay datasheet (Doc #98229) and ensures minimal standby power loss in always-on automotive modules such as telematics units and gateway ECUs, even under extreme thermal stress.
SM8S64CAHM3/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):
- 64V
- Voltage - Breakdown (Min):
- 71.1V
- Voltage - Clamping (Max) @ Ipp:
- 103V
- Current - Peak Pulse (10/1000µs):
- 64.1A
- 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
SM8S64CAHM3/I FAQ
1.How can I place an order for SM8S64CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8S64CAHM3/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 SM8S64CAHM3/I reliable?
The price and inventory of SM8S64CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM8S64CAHM3/I is usually 5 days.
3.What payment methods are accepted for SM8S64CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8S64CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8S64CAHM3/I?
SM8S64CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8S64CAHM3/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 SM8S64CAHM3/I?
For technical support, including SM8S64CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8S64CAHM3/I requirements.
6.How does Aetrix verify that SM8S64CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SM8S64CAHM3/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 SM8S64CAHM3/I meets industry standards.
7.What is the process for return or replacement of SM8S64CAHM3/I?
All SM8S64CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM8S64CAHM3/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 SM8S64CAHM3/I part is unused and in its original packaging.
Return procedure for SM8S64CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM8S64CAHM3/I Tags
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