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Vishay General Semiconductor - Diodes Division SM5S45CAHM3/I
- Part No.:
- SM5S45CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM5S45CAHM3/I.pdf
- Description:
- 3600 W BI-DIRECTIONAL TVS IS DO-
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
SM5S45CAHM3/I from Vishay General Semiconductor is a bidirectional surface-mount PAR® transient voltage suppressor (TVS) diode in DO-218AC package, with 50.0 V minimum breakdown voltage, 45.0 V stand-off voltage, and 3600 W peak pulse power (10/1000 µs). It delivers 49.5 A peak pulse current and clamps to 72.7 V at rated surge, meeting AEC-Q101 qualification for automotive load dump protection.
For engineers reviewing the SM5S45CAHM3/I datasheet, SM5S45CAHM3/I pinout, SM5S45CAHM3/I application, or SM5S45CAHM3/I equivalent, this device is selected for high-reliability 12 V/24 V automotive power rail protection where TJ = 175 °C operation, ISO 7637-2 compliance, and low leakage (<10 µA at VWM) are required.
Technical Context
This TVS operates as a voltage-clamping overvoltage protection device across bidirectional signal or power lines. Its silicon avalanche structure enables fast response (<1 ns), low clamping ratio (VC/VBR ≈ 1.38), and stable performance up to 175 °C junction temperature.
Designed for unidirectional or bidirectional surge suppression without polarity marking, it uses a planar junction passivated die in a thermally enhanced DO-218AC case with metal heatsink terminal, achieving RθJM = 0.45 °C/W for efficient heat transfer to PCB copper.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min) | 50.0 V - Ensures reliable triggering above normal 45 V system transients |
| VWM | 45.0 V - Maximum continuous reverse operating voltage without conduction |
| IPPM (10/1000 µs) | 49.5 A - Sustains automotive load dump surges per ISO 7637-2 Pulse 5a |
| VC @ IPPM | 72.7 V - Clamped voltage limits downstream IC stress during surge events |
| PPPM (10/1000 µs) | 3600 W - High-energy absorption capacity for short-duration transients |
| TJ max | 175 °C - Enables under-hood deployment without derating in engine control units |
| ID @ VWM | <10 µA - Minimizes standby power loss in always-on vehicle modules |
Pinout & Package
Package: DO-218AC - Surface-mount, bidirectional, no cathode band; features metal heatsink terminal (Lead 2) for low thermal resistance (RθJM = 0.45 °C/W) and matte tin-plated leads compliant with J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Anode / Cathode (bidirectional) | Electrically symmetric terminal; no polarity marking required |
| Lead 2 / Metal Heatsink | Thermal & Electrical Common | Primary heat path to PCB copper; also serves as one conduction path |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
| MSL Level 1 (245 °C peak) | Compatible with standard lead-free reflow profiles without moisture sensitivity concerns |
| ISO 7637-2 & ISO 16750-2 compliant | Meets automotive transient immunity requirements for load dump and jump start conditions |
| Halogen-free, RoHS-compliant (M3) | Meets global environmental regulations and supports green manufacturing initiatives |
| Junction-to-mount thermal resistance = 0.45 °C/W | Enables >80% of surge energy to dissipate directly into PCB copper, reducing thermal stress |
Applications
| Engine Control Unit (ECU) Power Input | Body Control Module (BCM) CAN Bus Lines |
|---|---|
Use Scenario: Protects 12 V supply rail against alternator load dump transients exceeding 120 V. IC Role / Device Role / Timing Role: Primary clamping TVS placed upstream of DC/DC converter input. Use Value: Limits voltage to ≤72.7 V during 3600 W surges, preventing damage to LDOs and microcontrollers. | Use Scenario: Shields high-speed CAN FD transceivers from coupled ESD and inductive switching noise. IC Role / Device Role / Timing Role: Bidirectional line protector on CAN_H/CAN_L differential pair. Use Value: Sub-1 ns response and <10 µA leakage preserve signal integrity and bus bias stability. |
| ADAS Camera Power Supply | Electric Power Steering (EPS) Motor Driver |
Use Scenario: Secures 5 V/3.3 V imaging sensor rails against ignition-induced transients in front-end camera modules. IC Role / Device Role / Timing Role: Secondary-stage TVS after primary bulk clamp, fine-tuning clamping level. Use Value: Tight VBR tolerance (±5%) ensures predictable activation without false triggering. | Use Scenario: Guards gate driver ICs and MOSFETs from motor back-EMF spikes during PWM commutation. IC Role / Device Role / Timing Role: Snubber-style clamp across H-bridge supply rails. Use Value: 175 °C rating allows placement near motor drivers without thermal derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ45CA | DO-214AC package; lower PPPM (400 W); VC = 73.0 V; RθJA = 100 °C/W | Not AEC-Q101 qualified; limited to industrial/commercial use | Select when cost sensitivity outweighs automotive qualification and thermal performance needs |
| TPSMD45CA | DO-218AC package; same VWM/VBR; PPPM = 3600 W; VC = 73.0 V; TJ max = 175 °C | Also AEC-Q101 qualified; identical thermal specs but different manufacturer test methodology | Consider for dual-sourcing where Vishay supply continuity is constrained |
Compared with SMAJ45CA and TPSMD45CA, the SM5S45CAHM3/I provides superior thermal performance (RθJM = 0.45 °C/W vs. ~1.2 °C/W for SMAJ), guaranteed AEC-Q101 compliance, and tighter VBR tolerance-making it optimal for space-constrained, high-temperature automotive power rail protection.
Availability
SM5S45CAHM3/I is available at Aetrix Electronics and suitable for automotive ECU power inputs, ADAS camera modules, body control units, and electric power steering systems requiring stable component supply across extended temperature and surge environments.
Supply support for SM5S45CAHM3/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, rectifiers, and protection devices with emphasis on automotive, industrial, and computing applications.
The SM5SxxCA family is engineered specifically for high-energy automotive transient suppression, combining DO-218AC thermal efficiency with AEC-Q101 reliability for next-generation 12 V/48 V vehicle architectures.
FAQ
What is the maximum clamping voltage of SM5S45CAHM3/I at its rated peak pulse current?
The SM5S45CAHM3/I has a maximum clamping voltage (VC) of 72.7 V when subjected to its rated 49.5 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured per Figure 4 in the Vishay datasheet 98458 and defines the upper voltage limit imposed on protected circuitry during surge events.
Is SM5S45CAHM3/I suitable for 48 V automotive systems?
No-SM5S45CAHM3/I is optimized for 12 V/24 V nominal systems. Its 45 V stand-off voltage (VWM) and 50–55.3 V breakdown range make it inappropriate for sustained 48 V rail operation, where higher VWM devices like SM5S64CAHM3/I (VWM = 64 V) are specified. Using SM5S45CAHM3/I on a 48 V bus would cause continuous leakage or premature conduction.
Does SM5S45CAHM3/I require a heatsink on the PCB?
No external heatsink is required. The DO-218AC package integrates a metal heatsink terminal (Lead 2) that provides direct thermal conduction to PCB copper. With RθJM = 0.45 °C/W, adequate copper area (≥100 mm² 2 oz. copper) suffices for full 3600 W surge handling per JEDEC 51-14 test method-eliminating need for added thermal hardware.
What does the "HM3" suffix indicate in SM5S45CAHM3/I?
The "HM3" suffix in SM5S45CAHM3/I denotes three critical attributes: H = AEC-Q101 qualification, M3 = halogen-free, RoHS-compliant, and Pb-free termination, and the "3" confirms standard type construction. The trailing "/I" specifies tape-and-reel packaging (750 pcs/reel, 13″ diameter, anode toward sprocket hole).
How does SM5S45CAHM3/I compare to older SMAJ series in surge robustness?
SM5S45CAHM3/I delivers 9× higher peak pulse power (3600 W vs. 400 W for SMAJ45CA) and 50% lower thermal resistance (RθJM = 0.45 °C/W vs. ~1.2 °C/W), enabling reliable operation under repeated ISO 7637-2 Pulse 5a load dump events where SMAJ devices would thermally saturate or fail. Its DO-218AC package is purpose-built for this performance tier.
SM5S45CAHM3/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):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 72.7V
- Current - Peak Pulse (10/1000µs):
- 49.5A
- 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
SM5S45CAHM3/I FAQ
1.How can I place an order for SM5S45CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM5S45CAHM3/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 SM5S45CAHM3/I reliable?
The price and inventory of SM5S45CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM5S45CAHM3/I is usually 5 days.
3.What payment methods are accepted for SM5S45CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM5S45CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM5S45CAHM3/I?
SM5S45CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM5S45CAHM3/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 SM5S45CAHM3/I?
For technical support, including SM5S45CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM5S45CAHM3/I requirements.
6.How does Aetrix verify that SM5S45CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SM5S45CAHM3/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 SM5S45CAHM3/I meets industry standards.
7.What is the process for return or replacement of SM5S45CAHM3/I?
All SM5S45CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM5S45CAHM3/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 SM5S45CAHM3/I part is unused and in its original packaging.
Return procedure for SM5S45CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM5S45CAHM3/I Tags
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