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Vishay General Semiconductor - Diodes Division SM5S64CAHM3/I
- Part No.:
- SM5S64CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM5S64CAHM3/I.pdf
- Description:
- 3600 W BI-DIRECTIONAL TVS IS DO-
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
SM5S64CAHM3/I from Vishay General Semiconductor is a bidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for automotive load dump protection in 12 V/24 V systems. It features a 71.1–78.6 V breakdown voltage (VBR), 64 V stand-off voltage (VWM), 103 V maximum clamping voltage (VC) at 35 A peak pulse current, and 3600 W peak pulse power (10/1000 µs). Its DO-218AC package supports high-reliability underhood applications up to TJ = 175 °C.
For engineers reviewing the SM5S64CAHM3/I datasheet, SM5S64CAHM3/I pinout, SM5S64CAHM3/I application, or SM5S64CAHM3/I equivalent, this device is selected for ISO 7637-2 and ISO 16750-2 compliant transient suppression in automotive power line protection, where low leakage (<10 µA at VWM), AEC-Q101 qualification, and MSL Level 1 solderability are mandatory design requirements.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector with bidirectional symmetry-no cathode band-and relies on avalanche breakdown to divert surge energy away from sensitive downstream circuitry. Its thermal resistance RθJM of 0.45 °C/W enables efficient heat transfer to the PCB metal heatsink, critical for sustained operation at junction temperatures up to 175 °C.
The device meets JESD201 Class 2 whisker resistance and uses matte tin-plated leads compliant with J-STD-002 and JESD22-B102. Its DO-218AC case provides UL 94 V-0 flammability rating and is optimized for high-surge robustness in 10/1000 µs and 10/10,000 µs waveforms-delivering 3600 W and 2400 W respectively.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/typ/max) | 71.1 / 74.9 / 78.6 V - Ensures reliable turn-on above system nominal voltage while avoiding false triggering during transients. |
| VWM | 64 V - Sustains continuous reverse bias without conduction in 24 V automotive systems with ±20 % tolerance. |
| VC @ IPPM | 103 V at 35 A - Limits downstream voltage stress to safe levels during ISO 7637-2 Pulse 5a load dump events. |
| PPPM (10/1000 µs) | 3600 W - Handles high-energy surges typical of alternator load dump without degradation. |
| IPPM | 35 A - Peak current capacity validated per Fig. 4 waveform; derates linearly above TA = 25 °C. |
| TJ max. | 175 °C - Enables placement near hot engine control units with no derating penalty under AEC-Q101 conditions. |
| Leakage @ VWM | <10 µA at 25 °C - Minimizes standby power loss in always-on vehicle modules such as body controllers. |
Pinout & Package
Package: DO-218AC - Surface-mount, bidirectional, leadless metal-heatsink case with anode and cathode terminals integrated into a single molded body. Leads are matte tin-plated; polarity is non-directional (no cathode band).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Anode terminal (bidirectional) | One side of the symmetrical avalanche junction; connects to protected line (e.g., battery rail). |
| Lead 2 / Metal Heatsink | Cathode terminal (bidirectional) + thermal path | Second junction terminal and primary thermal interface to PCB copper pour; must be soldered to ≥100 mm² 2 oz. copper for RθJM = 0.45 °C/W performance. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive underhood use including temperature cycling, humidity, and mechanical shock per stress test plan. |
| MSL Level 1 (245 °C peak) | Enables standard reflow assembly without moisture sensitivity concerns or baking requirements. |
| Halogen-free, RoHS-compliant (M3) | Meets global environmental regulations and eliminates corrosive halogen emissions during end-of-life processing. |
| ISO 7637-2 & ISO 16750-2 compliance | Tested to withstand Pulse 1, 2a, 2b, 3a, 3b, and 5a waveforms-covering switching transients and load dump. |
| RθJM = 0.45 °C/W | Allows direct thermal coupling to PCB heatsink; enables >90 % of rated power dissipation without external heatsink. |
Applications
| Engine Control Unit (ECU) Power Input Protection | Body Control Module (BCM) Battery Rail Clamping |
|---|---|
Use Scenario: Protects microcontroller power rails from alternator load dump spikes during ignition-off events in 12 V/24 V vehicles. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed directly across battery input before DC/DC converter. Use Value: Clamps 103 V at 35 A to prevent overvoltage damage to 5 V/3.3 V regulators and MCU I/O pins during ISO 7637-2 Pulse 5a. |
Use Scenario: Safeguards LIN bus transceivers and door lock actuators against inductive kickback from window motor relays. IC Role / Device Role / Timing Role: Bidirectional clamp on 12 V supply rail feeding multiple low-power subsystems. Use Value: Sub-10 µA leakage preserves sleep-mode current budget; 175 °C rating ensures reliability near HVAC ducts. |
| ADAS Camera Power Supply Protection | Infotainment Head Unit Main Rail Protection |
Use Scenario: Shields image sensor and ISP power inputs from ESD and load dump in front-facing driver assistance cameras. IC Role / Device Role / Timing Role: First-line defense between connector and LDO regulator; placed adjacent to mating connector. Use Value: 3600 W surge rating absorbs multi-pulse transients without parametric shift; DO-218AC footprint minimizes board space. |
Use Scenario: Guards main 12 V input to audio amplifier and display controller against jump-start surges and battery reversal transients. IC Role / Device Role / Timing Role: Primary clamping device upstream of buck converters and USB power switches. Use Value: Meets JESD201 Class 2 whisker resistance for long-term reliability in vibration-prone dashboard environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ64A-E3/57T | Unidirectional; lower PPPM (400 W); SMA package; VC = 103 V at 12.3 A. | Requires series diode for bidirectional protection; unsuitable for load dump without redesign. | Select only if unidirectional operation suffices and board space allows larger SMA footprint. |
| TPSMD64A | Unidirectional; same DO-218AC package; VC = 104 V at 35.7 A; PPPM = 3600 W; not AEC-Q101 qualified. | Lacks automotive qualification; limited to industrial/commercial use where 175 °C operation is not required. | Acceptable for cost-sensitive non-automotive designs but requires full requalification for automotive deployment. |
Compared with SMAJ64A-E3/57T and TPSMD64A, the SM5S64CAHM3/I uniquely delivers bidirectional clamping, AEC-Q101 qualification, and guaranteed 175 °C operation in the compact DO-218AC package-making it the only drop-in solution for production automotive load dump protection without layout or reliability compromises.
Availability
SM5S64CAHM3/I is available at Aetrix Electronics and suitable for automotive ECU protection, ADAS camera power conditioning, and infotainment head unit surge suppression requiring stable component supply across extended production lifecycles.
Supply support for SM5S64CAHM3/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 SM5SxxCA family is engineered specifically for automotive-grade transient suppression-combining PAR® technology, AEC-Q101 validation, and DO-218AC thermal efficiency to meet stringent ISO 7637-2 and ISO 16750-2 requirements.
FAQ
What is the clamping voltage of SM5S64CAHM3/I at its rated peak pulse current?
The SM5S64CAHM3/I has a maximum clamping voltage (VC) of 103 V at 35 A peak pulse current (IPPM) under the 10/1000 µs waveform. This value is measured per Figure 4 in the Vishay datasheet (Doc. #98458) and defines the upper voltage limit imposed on protected circuitry during worst-case surge events. The SM5S64CAHM3/I maintains this clamping performance across its full operating temperature range.
Is SM5S64CAHM3/I suitable for 24 V automotive systems?
Yes, the SM5S64CAHM3/I is explicitly designed for 24 V automotive systems. Its 64 V stand-off voltage (VWM) accommodates normal battery fluctuations (±20 %), while its 71.1–78.6 V breakdown range ensures robust turn-on during load dump transients. It is AEC-Q101 qualified and tested to ISO 16750-2, making SM5S64CAHM3/I appropriate for underhood ECUs, ADAS modules, and other 24 V vehicle subsystems.
Does SM5S64CAHM3/I require a heatsink for full power operation?
No discrete heatsink is required. The SM5S64CAHM3/I leverages its DO-218AC metal heatsink terminal and low RθJM of 0.45 °C/W to dissipate heat directly into the PCB. When mounted on ≥100 mm² of 2 oz. copper, it sustains full 3600 W surge capability without external thermal management-enabling compact, high-density automotive layouts.
How does the HM3 suffix affect SM5S64CAHM3/I's compliance status?
"HM3" denotes halogen-free, RoHS-compliant construction with matte tin plating and JESD201 Class 2 whisker resistance. Crucially, the "H" also confirms AEC-Q101 qualification-verified through temperature cycling, HTRB, and surge testing. This makes SM5S64CAHM3/I distinct from non-H variants, which lack automotive qualification and may use different termination materials.
Can SM5S64CAHM3/I replace SM5S64A in existing designs?
No-SM5S64CAHM3/I is bidirectional (CA), while SM5S64A is unidirectional. Replacing one with the other without circuit review risks failure during negative-going transients. The "CA" suffix is essential for load dump protection where polarity reversal occurs. Always verify polarity, VBR, and qualification level before substitution; SM5S64CAHM3/I must be used where bidirectional clamping and AEC-Q101 are specified.
SM5S64CAHM3/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):
- 35A
- 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
SM5S64CAHM3/I FAQ
1.How can I place an order for SM5S64CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM5S64CAHM3/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 SM5S64CAHM3/I reliable?
The price and inventory of SM5S64CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM5S64CAHM3/I is usually 5 days.
3.What payment methods are accepted for SM5S64CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM5S64CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM5S64CAHM3/I?
SM5S64CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM5S64CAHM3/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 SM5S64CAHM3/I?
For technical support, including SM5S64CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM5S64CAHM3/I requirements.
6.How does Aetrix verify that SM5S64CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SM5S64CAHM3/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 SM5S64CAHM3/I meets industry standards.
7.What is the process for return or replacement of SM5S64CAHM3/I?
All SM5S64CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM5S64CAHM3/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 SM5S64CAHM3/I part is unused and in its original packaging.
Return procedure for SM5S64CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM5S64CAHM3/I Tags
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Diodes Incorporated
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Diodes Incorporated
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