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Vishay General Semiconductor - Diodes Division SM5S40AHM3/I
- Part No.:
- SM5S40AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AC
- Datasheet:
-
SM5S40AHM3/I.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO218AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,663
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Product details
Overview
SM5S40AHM3/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® Transient Voltage Suppressor in DO-218AB package, rated for 40 V stand-off voltage (VWM), 44.2 V maximum breakdown voltage (VBR), 3600 W peak pulse power (10/1000 μs), 175 °C junction temperature, and AEC-Q101 qualified for automotive load dump protection.
For engineers reviewing the SM5S40AHM3/I datasheet, SM5S40AHM3/I pinout, SM5S40AHM3/I application, or SM5S40AHM3/I equivalent, this device is selected for high-reliability 12 V/24 V automotive power rail transient suppression where low leakage (<10 μA at VWM), low clamping voltage (62 V at IPPM), and MSL Level 1 solderability are critical design requirements.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology with junction passivation optimized for stable operation up to TJ = 175 °C. Its unidirectional polarity and heatsink-anode configuration enable direct mounting to thermal planes in automotive ECUs and body control modules.
The device meets ISO 7637-2 surge test conditions for load dump transients and delivers 500 A peak forward surge current (IFSM, 8.3 ms half-sine). Thermal resistance junction-to-mount is 0.45 °C/W, supporting high-power dissipation when mounted on copper heatsinks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 24 V automotive systems. |
| VBR (max) | 44.2 V - Upper limit of breakdown voltage at 5 mA test current; ensures predictable turn-on during transients. |
| VC (max) | 62 V - Clamping voltage at rated IPPM; limits downstream IC stress during 3600 W surges. |
| PPPM (10/1000 μs) | 3600 W - Peak pulse power handling capability; supports ISO 7637-2 Load Dump Pulse 5a compliance. |
| TJ max | 175 °C - Maximum junction temperature rating; enables placement near hot components in engine bay modules. |
| ID (at VWM) | <10 μA - Reverse leakage at 40 V; minimizes standby power loss in always-on vehicle networks. |
| IFSM | 500 A - Non-repetitive surge current rating (8.3 ms); withstands high-energy inductive switching events. |
Pinout & Package
Package: DO-218AB - Surface-mount molded case with metal heatsink terminal (anode) and lead terminal (cathode); UL 94 V-0 rated; RoHS-compliant matte tin plating; MSL Level 1 (245 °C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Heatsink) | High-current return path and thermal interface | Must be soldered to large copper pour or heatsink for RθJM = 0.45 °C/W; electrically connected to cathode via internal PN junction during clamping. |
| Cathode (Lead 1) | Transient voltage sensing and clamping node | Connected to protected line (e.g., battery rail); conducts surge current to anode when V > VBR; marked with polarity band on package. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JESD47. |
| Junction passivation | Reduces surface leakage and improves long-term stability under high-humidity and high-temperature bias conditions. |
| Low clamping ratio (VC/VBR ≈ 1.4) | Ensures tight overvoltage margin between breakdown and clamping-critical for protecting 48 V tolerant CAN FD transceivers. |
| MSL Level 1 rating | Enables standard SMT reflow without moisture sensitivity concerns-no baking required prior to assembly. |
| Unidirectional polarity | Optimized for DC-biased rails (e.g., battery feeds); avoids reverse conduction losses present in bidirectional devices. |
Applications
| Engine Control Unit (ECU) Power Protection | Body Control Module (BCM) Input Protection |
|---|---|
Use Scenario: Suppresses load dump transients (up to 60 V, 400 ms) induced by alternator field-circuit interruption in gasoline/diesel engine ECUs. IC Role / Device Role / Timing Role: Primary clamping device on main 12 V battery input rail, placed upstream of DC/DC converters and microcontrollers. Use Value: Limits rail voltage to ≤62 V during ISO 7637-2 Pulse 5a, preventing latch-up or permanent damage to 3.3 V/5 V logic supplies. |
Use Scenario: Protects BCM inputs from switching spikes generated by relays, motors, and solenoids in door, lighting, and HVAC subsystems. IC Role / Device Role / Timing Role: Standoff-rated TVS on switched 12 V supply lines feeding LIN transceivers and sensor interfaces. Use Value: Maintains <10 μA leakage at 40 V to avoid false wake-up in sleep-mode circuits while clamping 3600 W surges within 1 ns response time. |
| ADAS Camera Power Rail Protection | Electric Power Steering (EPS) Motor Driver Protection |
Use Scenario: Shields image sensor and ISP power domains from coupled transients during start-stop cycles and regenerative braking events. IC Role / Device Role / Timing Role: Secondary protection stage after front-end fuse and common-mode choke; placed adjacent to PMIC input. Use Value: Withstands 175 °C ambient operation near camera housing, ensuring reliability across -40 °C to +105 °C ambient range. |
Use Scenario: Absorbs inductive kickback from H-bridge motor windings during PWM commutation and fault shutdown in EPS systems. IC Role / Device Role / Timing Role: Parallel-connected TVS across motor driver supply pins to clamp flyback energy into battery rail. Use Value: Delivers 500 A IFSM to handle repetitive 8.3 ms surges without degradation-validated over 1000+ thermal cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SM5S43AHM3/I | Higher VWM (43 V) and VBR (47.8 V max); same DO-218AB package and 3600 W PPPM rating. | Better suited for 24 V nominal systems with wider voltage tolerance (e.g., commercial truck battery rails). | Select when system nominal voltage exceeds 24 V or requires higher standoff margin before clamping onset. |
| SMAJ40AHE3/A | Lower PPPM (400 W), SMA package (DO-214AC), 150 °C TJ max, same VWM/VBR range. | Limited to lower-energy transients; not AEC-Q101 qualified; unsuitable for under-hood deployment. | Use only for cost-sensitive non-automotive industrial controls where 3600 W surge immunity is not required. |
Compared with SM5S40AHM3/I, SM5S43AHM3/I offers extended voltage margin for 24 V+ systems without sacrificing surge capability, while SMAJ40AHE3/A trades robustness and qualification for smaller footprint and lower cost in benign environments.
Availability
SM5S40AHM3/I is available at Aetrix Electronics and suitable for automotive ECU power protection, body control module input conditioning, and ADAS camera rail stabilization requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for SM5S40AHM3/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 designs and manufactures discrete semiconductors with emphasis on high-reliability, high-power, and automotive-qualified components.
The SM5S series is part of Vishay's PAR® TVS platform, engineered specifically for automotive load dump and inductive switching transient suppression in engine bay and chassis applications.
FAQ
What is the clamping voltage of SM5S40AHM3/I at its rated peak pulse current?
The SM5S40AHM3/I has a maximum clamping voltage (VC) of 62 V at its rated peak pulse current (IPPM) under 10/1000 μs waveform conditions. This value is measured per JEDEC standards and ensures downstream circuitry remains below destructive voltage thresholds during ISO 7637-2 Pulse 5a events. The SM5S40AHM3/I maintains this clamping performance across its full operating temperature range from -55 °C to +175 °C.
Is SM5S40AHM3/I qualified for automotive applications?
Yes, SM5S40AHM3/I is AEC-Q101 qualified and explicitly designed for automotive use, including engine control units and body control modules. It meets ISO 7637-2 surge requirements, operates up to 175 °C junction temperature, and is manufactured with passivated anisotropic rectifier technology for long-term reliability under thermal and humidity stress. The SM5S40AHM3/I carries the "H" suffix denoting AEC-Q101 qualification in its ordering code.
What does the "HM3" suffix indicate in SM5S40AHM3/I?
The "HM3" suffix in SM5S40AHM3/I decodes as follows: "H" = AEC-Q101 qualified, "M3" = DO-218AB package with matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards. The "I" denotes 13-inch tape-and-reel packaging with anode orientation toward sprocket holes. This full suffix confirms the SM5S40AHM3/I meets automotive-grade material, process, and packaging requirements.
Can SM5S40AHM3/I replace older SM5S40A variants?
Yes, SM5S40AHM3/I is a direct replacement for legacy SM5S40A in new designs, offering identical electrical specifications (VWM = 40 V, VBR = 44.2 V max, PPPM = 3600 W) plus enhanced qualifications: AEC-Q101 compliance, MSL Level 1 rating, and JESD201 Class 2 whisker resistance. The SM5S40AHM3/I uses the same DO-218AB mechanical outline and thermal interface, enabling drop-in PCB reuse without layout changes.
What is the thermal resistance profile of SM5S40AHM3/I?
The SM5S40AHM3/I has a junction-to-mount thermal resistance (RθJM) of 0.45 °C/W when soldered to a copper heatsink, and a junction-to-ambient resistance (RθJA) of 55 °C/W on standard FR4 PCB with 2 oz. copper. These values are measured per JEDEC 51-14 (TDIM) and JEDEC 51-2A, respectively. The low RθJM enables effective heat extraction in high-power automotive transients, directly supporting the SM5S40AHM3/I's 175 °C TJ rating.
SM5S40AHM3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-218AC
- Series:
- PAR®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 64.5V
- Current - Peak Pulse (10/1000µs):
- 56A
- 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-218AC
SM5S40AHM3/I FAQ
1.How can I place an order for SM5S40AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM5S40AHM3/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 SM5S40AHM3/I reliable?
The price and inventory of SM5S40AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM5S40AHM3/I is usually 5 days.
3.What payment methods are accepted for SM5S40AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM5S40AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM5S40AHM3/I?
SM5S40AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM5S40AHM3/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 SM5S40AHM3/I?
For technical support, including SM5S40AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM5S40AHM3/I requirements.
6.How does Aetrix verify that SM5S40AHM3/I is sourced from the original manufacturer or authorized distributors?
All SM5S40AHM3/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 SM5S40AHM3/I meets industry standards.
7.What is the process for return or replacement of SM5S40AHM3/I?
All SM5S40AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM5S40AHM3/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 SM5S40AHM3/I part is unused and in its original packaging.
Return procedure for SM5S40AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM5S40AHM3/I Tags
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