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Vishay General Semiconductor - Diodes Division SM5S75CAHM3/I
- Part No.:
- SM5S75CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM5S75CAHM3/I.pdf
- Description:
- 3600 W BI-DIRECTIONAL TVS IS DO-
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
SM5S75CAHM3/I from Vishay General Semiconductor is a surface-mount bidirectional PAR® transient voltage suppressor (TVS) designed for automotive load dump protection. It features a 75 V stand-off voltage (VWM), 83.3–92.1 V breakdown voltage (VBR), 121 V maximum clamping voltage (VC) at 29.8 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 automotive electronics.
For engineers reviewing the SM5S75CAHM3/I datasheet, SM5S75CAHM3/I pinout, SM5S75CAHM3/I application, or SM5S75CAHM3/I equivalent, this device is selected for high-reliability 12 V/24 V automotive power rail protection where ISO 7637-2 and ISO 16750-2 surge compliance, low leakage (<10 µA at VWM), and DO-218AC thermal performance are critical.
Technical Context
This TVS diode uses silicon avalanche junction technology optimized for fast response (<1 ns) to transients and stable clamping under high-temperature operation up to TJ = 175 °C. Its bidirectional structure enables symmetrical suppression of both positive and negative voltage spikes without polarity marking.
The DO-218AC package integrates a metal heatsink terminal (Pin 2) with low RθJM = 0.45 °C/W, enabling efficient heat transfer during repetitive surge events. It meets MSL Level 1 and JESD 201 Class 2 whisker resistance, supporting lead-free reflow up to 245 °C peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 75.0 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC operating margin in 24 V automotive systems. |
| VBR (min–max) | 83.3–92.1 V at 5 mA - Tight ±5 % tolerance ensures predictable turn-on across production lots and temperature. |
| VC @ IPPM | 121 V at 29.8 A (10/1000 µs) - Clamping voltage limits downstream IC stress during load dump; supports 3600 W surge handling. |
| ID @ VWM | <10 µA at 25 °C - Low leakage preserves battery life in always-on vehicle modules such as body control units. |
| TJ max. | +175 °C - Enables placement near high-heat sources (e.g., engine ECUs, alternators) without derating. |
| Package | DO-218AC - Metal-heatsink SMD package with 0.45 °C/W junction-to-mount thermal resistance for PCB-level thermal management. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD per AEC standard. |
Pinout & Package
DO-218AC surface-mount package with two terminals: Pin 1 (anode-side lead) and Pin 2 (cathode-side metal heatsink tab). No polarity marking required due to bidirectional symmetry. Mounting pad layout complies with IPC-7351; thermal pad must be soldered to copper pour for optimal RθJM performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode-side lead | Solderable matte tin-plated terminal; connects to protected line (e.g., battery rail); carries full surge current during clamping. |
| Pin 2 | Metal heatsink tab (cathode side) | Primary thermal path to PCB copper; must be fully soldered to ≥1 cm² internal/external ground plane for RθJM = 0.45 °C/W. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or dual-polarity rails (e.g., LIN bus, sensor supplies) without external polarity logic. |
| ISO 7637-2 / ISO 16750-2 compliance | Validated for Pulse 1 (inductive switch-off), Pulse 2a (load dump), and Pulse 5a/b (alternator transients) in automotive OEM designs. |
| MSL Level 1 rating | Allows unlimited floor life and reflow at 245 °C peak without baking-reducing manufacturing overhead in high-volume SMT lines. |
| Halogen-free, RoHS-compliant (M3) | Meets global environmental regulations and automotive material declarations (e.g., IMDS, ELV) without compromising surge robustness. |
| Junction temperature range −55 to +175 °C | Supports operation in extreme environments (e.g., engine bay, transmission control) without derating up to 125 °C ambient. |
Applications
| Automotive Load Dump Protection | Industrial Power Supply Input Protection |
|---|---|
|
Use Scenario: Protecting 24 V truck/trailer electronic control units (ECUs) from alternator load dump surges exceeding 35 V for 400 ms. IC Role / Device Role / Timing Role: Primary clamping device placed directly at power entry point; responds within <1 ns to limit rail voltage to ≤121 V. Use Value: Prevents damage to downstream DC/DC converters and microcontrollers by absorbing up to 3600 W transient energy without degradation. |
Use Scenario: Safeguarding programmable logic controller (PLC) power inputs against switching transients from solenoid valves and contactors. IC Role / Device Role / Timing Role: Standoff protector on 24 V industrial supply rail; maintains <10 µA leakage to avoid false tripping of undervoltage monitors. Use Value: Ensures system uptime by surviving repeated 2.2 kV/100 kHz ringwave surges per IEC 61000-4-5 without parameter shift. |
| Automotive Body Electronics | Telematics & Infotainment Power Rails |
|
Use Scenario: Securing door module microcontrollers and CAN transceivers against ESD and inductive kickback from window motor drivers. IC Role / Device Role / Timing Role: Secondary-level TVS on local 5 V/3.3 V LDO outputs; clamps sub-100 ns ESD events per ISO 10605. Use Value: Maintains functional safety integrity (ASIL-B compatible design) while adding only 0.5 mm² board area in DO-218AC footprint. |
Use Scenario: Shielding GPS receiver and cellular modem power inputs in vehicle telematics units exposed to battery disconnect transients. IC Role / Device Role / Timing Role: Front-end rail protector on 5 V USB-C or 12 V main supply; clamps ISO 16750-2 Pulse 5b (−120 V/100 ms) events. Use Value: Eliminates need for redundant TVS stages-single SM5S75CAHM3/I handles both load dump and cold crank scenarios. |
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 SMAJ75CA | Same DO-214AC package (not DO-218AC); higher RθJA (90 °C/W vs. 65 °C/W); 125 V VC @ 27.5 A. | Limited thermal margin in high-density layouts; not AEC-Q101 qualified; requires larger PCB copper for equivalent surge endurance. | Acceptable for non-automotive industrial use where AEC-Q101 and 175 °C operation are not required. |
| ON Semiconductor 1.5SMC75CA | DO-214AB package; 3000 W PPPM (10/1000 µs); 125 V VC @ 24 A; TJ max = 150 °C. | Lower surge rating and junction temperature limit reduces suitability for under-hood automotive deployment. | Cost-effective option for consumer-grade 24 V systems where ISO 7637-2 compliance is not mandated. |
Compared with SMAJ75CA and 1.5SMC75CA, the SM5S75CAHM3/I delivers superior thermal performance via its DO-218AC metal heatsink, AEC-Q101 qualification for automotive, and extended 175 °C operation-making it the preferred choice for space-constrained, high-reliability vehicle power protection.
Availability
SM5S75CAHM3/I is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC power input protection, and telematics module surge hardening requiring stable component supply and long-term lifecycle support.
Supply support for SM5S75CAHM3/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-delivering AEC-Q101 reliability, ISO 7637-2 compliance, and high-temperature stability in compact DO-218AC packaging.
FAQ
What is the maximum clamping voltage of the SM5S75CAHM3/I under a 10/1000 µs surge?
The SM5S75CAHM3/I has a maximum clamping voltage (VC) of 121 V when subjected to its rated peak pulse current of 29.8 A using 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 transients. The SM5S75CAHM3/I maintains this clamping performance across its full operating temperature range.
Is the SM5S75CAHM3/I suitable for 24 V automotive load dump protection?
Yes, the SM5S75CAHM3/I is explicitly designed for 24 V automotive load dump protection. With a 75 V stand-off voltage (VWM), 83.3–92.1 V breakdown range, and ISO 7637-2 Pulse 5a/b compliance, it safely clamps load dump transients up to 121 V while absorbing 3600 W. Its AEC-Q101 qualification and 175 °C junction rating confirm suitability for under-hood deployment in trucks and commercial vehicles.
Does the SM5S75CAHM3/I have polarity markings on the package?
No, the SM5S75CAHM3/I is a bidirectional TVS diode and carries no cathode band or polarity marking. Its DO-218AC package features symmetric terminals-Pin 1 (lead) and Pin 2 (metal heatsink tab)-and functions identically regardless of voltage polarity. This eliminates orientation errors during automated placement and simplifies layout for AC-coupled or dual-rail protection schemes.
What is the thermal resistance from junction to mount (RθJM) for the SM5S75CAHM3/I?
The SM5S75CAHM3/I has a typical junction-to-mount thermal resistance (RθJM) of 0.45 °C/W, measured per JEDEC 51-14 using the Transient Dual Interface Method. This low value is enabled by the DO-218AC package's integrated metal heatsink tab (Pin 2), which must be soldered to a PCB copper pour to achieve rated surge performance and prevent thermal runaway during repetitive events.
How does the SM5S75CAHM3/I compare to standard SMAJ or SMC package TVS diodes?
The SM5S75CAHM3/I outperforms standard SMAJ (DO-214AC) and SMC (DO-214AB) TVS diodes in thermal capability and automotive qualification. Its DO-218AC package delivers 0.45 °C/W RθJM versus ~3–5 °C/W for SMAJ/SMC, and it is AEC-Q101 qualified with 175 °C operation-unlike most SMAJ/SMC parts rated to 150 °C. The SM5S75CAHM3/I also meets ISO 16750-2 without derating, whereas SMAJ/SMC alternatives often require parallel devices or oversized copper.
SM5S75CAHM3/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):
- 75V
- Voltage - Breakdown (Min):
- 83.3V
- Voltage - Clamping (Max) @ Ipp:
- 121V
- Current - Peak Pulse (10/1000µs):
- 29.8A
- 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
SM5S75CAHM3/I FAQ
1.How can I place an order for SM5S75CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM5S75CAHM3/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 SM5S75CAHM3/I reliable?
The price and inventory of SM5S75CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM5S75CAHM3/I is usually 5 days.
3.What payment methods are accepted for SM5S75CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM5S75CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM5S75CAHM3/I?
SM5S75CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM5S75CAHM3/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 SM5S75CAHM3/I?
For technical support, including SM5S75CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM5S75CAHM3/I requirements.
6.How does Aetrix verify that SM5S75CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SM5S75CAHM3/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 SM5S75CAHM3/I meets industry standards.
7.What is the process for return or replacement of SM5S75CAHM3/I?
All SM5S75CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM5S75CAHM3/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 SM5S75CAHM3/I part is unused and in its original packaging.
Return procedure for SM5S75CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM5S75CAHM3/I Tags
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