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Vishay General Semiconductor - Diodes Division SM5S33CAHM3/I
- Part No.:
- SM5S33CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM5S33CAHM3/I.pdf
- Description:
- 3600 W BI-DIRECTIONAL TVS IS DO-
- Quantity:
- Payment:
- Shipping:
Inventory:2,982
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Product details
Overview
SM5S33CAHM3/I from Vishay General Semiconductor is a surface-mount bidirectional PAR® Transient Voltage Suppressor designed for automotive load dump protection in 12 V and 24 V systems. It features a breakdown voltage of 36.7–40.6 V, clamps at ≤53.3 V under 150 A peak pulse current (10/1000 μs), and delivers 3600 W peak pulse power with <10 μA reverse leakage at 33 V stand-off voltage.
For engineers reviewing the SM5S33CAHM3/I datasheet, SM5S33CAHM3/I pinout, SM5S33CAHM3/I application, or SM5S33CAHM3/I equivalent, this AEC-Q101 qualified TVS diode supports high-reliability automotive electronics requiring ISO 7637-2 and ISO 16750-2 surge compliance, TJ = 175 °C operation, and DO-218AC package thermal performance.
Technical Context
This device operates as a bidirectional voltage-clamping protector with no polarity marking-ideal for AC-coupled or floating bus lines. Its low RθJM = 0.45 °C/W and high surge capability stem from the metal-heatsink DO-218AC package, enabling efficient transient energy dissipation without external heatsinking in constrained PCB layouts.
The SM5S33CAHM3/I exhibits stable clamping behavior across -55 °C to +175 °C junction temperature, with <10 μA leakage at VWM = 33 V and <250 μA at TJ = 175 °C. It meets MSL Level 1 per J-STD-020 and passes JESD 201 Class 2 whisker testing due to matte tin-plated terminals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/typ/max) | 36.7 V / 38.7 V / 40.6 V - ensures reliable turn-on above system nominal voltage while avoiding false triggering during transients |
| VWM | 33.0 V - maximum continuous reverse operating voltage compatible with 24 V automotive systems |
| VC @ IPPM | ≤53.3 V at 150 A (10/1000 μs) - limits downstream IC stress during load dump events |
| PPPM (10/1000 μs) | 3600 W - sustains high-energy surges typical of alternator load dump per ISO 7637-2 Pulse 5a |
| ID @ VWM | ≤10 μA at 25 °C; ≤250 μA at 175 °C - minimizes standby power loss and maintains signal integrity in always-on modules |
| TJ max. | +175 °C - enables placement near hot engine control units without derating |
| Package | DO-218AC - metal-heatsink construction provides low thermal resistance (RθJM = 0.45 °C/W) and robust mechanical mounting |
Pinout & Package
SM5S33CAHM3/I uses the DO-218AC surface-mount package with two terminals: Lead 1 and Lead 2/Metal Heatsink. The device is bidirectional with no cathode band; both terminals are electrically symmetric and thermally connected to the exposed metal base for enhanced heat transfer.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Anode/Reverse-biased terminal (symmetrical) | Electrically identical to Lead 2; used for PCB layout symmetry and thermal anchoring |
| Lead 2 / Metal Heatsink | Cathode/Heatsink interface (symmetrical) | Primary thermal path to PCB copper; must be soldered to ≥1 cm² thermal pad for rated RθJM |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive underhood applications including temperature cycling, humidity bias, and mechanical shock |
| ISO 7637-2 & ISO 16750-2 compliance | Passes Pulse 5a (load dump) up to 3600 W without degradation-no external series impedance required |
| DO-218AC metal-heatsink package | RθJM = 0.45 °C/W enables >90 % of rated PPPM dissipation directly into PCB, eliminating discrete heatsinks |
| Halogen-free, RoHS-compliant, M3 termination | Meets automotive material restrictions (J-STD-020 LF peak = 245 °C) and JESD 201 Class 2 whisker resistance |
| Bidirectional clamping | Protects AC-coupled sensors and differential buses (e.g., LIN, CAN FD stubs) without polarity concerns |
Applications
| Engine Control Unit Protection | Body Control Module Input Protection |
|---|---|
Use Scenario: Protecting microcontroller I/O and sensor inputs from alternator load dump surges in gasoline/diesel ECUs. IC Role / Device Role / Timing Role: Primary clamping device placed at connector entry point before ESD diodes and filtering. Use Value: Limits voltage to ≤53.3 V during 3600 W transients, preventing latch-up or gate oxide damage in 3.3 V/5 V logic interfaces. |
Use Scenario: Safeguarding LIN bus transceivers and door module switches against battery reversal and jump-start spikes. IC Role / Device Role / Timing Role: Bidirectional overvoltage clamp on power rails and data lines with no polarity dependency. Use Value: Maintains <10 μA leakage at 12 V nominal, preserving sleep-mode current budgets while surviving 175 °C underhood temperatures. |
| ADAS Camera Power Rail Protection | Electric Power Steering Motor Driver Protection |
Use Scenario: Securing 12 V input to image sensor SoCs and ISP power supplies in front/rear-view cameras. IC Role / Device Role / Timing Role: First-line transient suppressor upstream of DC/DC converters and LDOs. Use Value: Clamps within 1 ns response time to protect sensitive analog pixel circuitry from ISO 16750-2 Pulse 4 (supply interruption recovery). |
Use Scenario: Shielding H-bridge gate drivers and current sense amplifiers from inductive kickback during motor commutation. IC Role / Device Role / Timing Role: Parallel-connected TVS across motor supply rail to absorb repetitive 2400 W (10/10 ms) surges. Use Value: Sustains 2400 W at 10/10,000 μs waveform without parameter shift-verified over 1000 surge cycles per AEC-Q101. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33CA | DO-214AC package; lower PPPM = 400 W; RθJA = 110 °C/W; no metal heatsink | Suitable only for low-energy transients (e.g., ESD); cannot replace SM5S33CAHM3/I in load dump scenarios | Select SMAJ33CA only for cost-sensitive non-automotive applications where 3600 W surge immunity is not required. |
| TPSMD33CA | DO-218AB package; same 3600 W rating; but VBR = 36.7–40.6 V and VC = 53.3 V identical; halogen-free, AEC-Q101 qualified | Functionally interchangeable in layout; differs only in minor molding compound formulation and marking | TPSMD33CA offers identical electrical and thermal performance-valid alternative when SM5S33CAHM3/I is unavailable. |
Compared with SMAJ33CA and TPSMD33CA, the SM5S33CAHM3/I uniquely combines AEC-Q101 qualification, DO-218AC metal-heatsink thermal performance, and full ISO 7637-2 Pulse 5a compliance-making it the only option for high-reliability 24 V automotive load dump protection.
Availability
SM5S33CAHM3/I is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, ADAS camera power systems, and electric power steering designs requiring stable component supply across extended temperature and surge stress conditions.
Supply support for SM5S33CAHM3/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 was engineered specifically for automotive-grade transient suppression-delivering AEC-Q101 reliability, ISO-compliant surge handling, and metal-heatsink thermal efficiency in compact surface-mount packages.
FAQ
What is the maximum clamping voltage of the SM5S33CAHM3/I under standard test conditions?
The SM5S33CAHM3/I has a maximum clamping voltage (VC) of 53.3 V when subjected to a 150 A peak pulse current with a 10/1000 μs waveform. This value is measured per Figure 4 in the official Vishay datasheet (Doc. #98458) and represents the upper limit of voltage seen by protected circuitry during worst-case load dump events. The SM5S33CAHM3/I maintains this clamping performance across its full operating temperature range.
Is the SM5S33CAHM3/I suitable for 24 V automotive systems?
Yes, the SM5S33CAHM3/I is explicitly designed for 24 V automotive systems. Its 33 V stand-off voltage (VWM) provides adequate margin above nominal 24 V rails, while its 36.7–40.6 V breakdown range ensures robust activation during load dump transients. The device is AEC-Q101 qualified and meets ISO 7637-2 Pulse 5a requirements-making SM5S33CAHM3/I appropriate for underhood ECUs, battery management, and ADAS power domains.
Does the SM5S33CAHM3/I require a heatsink for full 3600 W rating?
No external heatsink is required for the SM5S33CAHM3/I to achieve its full 3600 W peak pulse power rating. Its DO-218AC package integrates a metal heatsink terminal that must be soldered to a minimum 1 cm² copper pad on the PCB. With this layout, the device achieves RθJM = 0.45 °C/W, allowing direct thermal conduction into the board-eliminating need for added heatsinks while maintaining safe junction temperatures during surge events.
How does the SM5S33CAHM3/I differ from standard SMAJ-series TVS diodes?
The SM5S33CAHM3/I differs from SMAJ33CA in three critical ways: (1) it uses the DO-218AC metal-heatsink package versus DO-214AC plastic, delivering 3600 W vs. 400 W peak power; (2) it is AEC-Q101 qualified and ISO 7637-2 compliant, whereas SMAJ33CA is industrial-grade only; (3) its RθJM = 0.45 °C/W enables direct PCB thermal sinking, unlike SMAJ33CA's RθJA = 110 °C/W. These differences make SM5S33CAHM3/I unsuitable for substitution with SMAJ33CA in automotive load dump applications.
What is the reverse leakage current specification for SM5S33CAHM3/I at elevated temperature?
At TJ = 175 °C, the SM5S33CAHM3/I exhibits a maximum reverse leakage current (ID) of 250 μA when biased at its 33 V stand-off voltage (VWM). This value is specified in Table 1 of the Vishay datasheet (Doc. #98458) and reflects stable performance under extreme underhood conditions. At room temperature (25 °C), ID is ≤10 μA-ensuring minimal impact on low-power sensor and communication circuits.
SM5S33CAHM3/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):
- 33V
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 53.3V
- Current - Peak Pulse (10/1000µs):
- 67.5A
- 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
SM5S33CAHM3/I FAQ
1.How can I place an order for SM5S33CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM5S33CAHM3/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 SM5S33CAHM3/I reliable?
The price and inventory of SM5S33CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM5S33CAHM3/I is usually 5 days.
3.What payment methods are accepted for SM5S33CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM5S33CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM5S33CAHM3/I?
SM5S33CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM5S33CAHM3/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 SM5S33CAHM3/I?
For technical support, including SM5S33CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM5S33CAHM3/I requirements.
6.How does Aetrix verify that SM5S33CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SM5S33CAHM3/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 SM5S33CAHM3/I meets industry standards.
7.What is the process for return or replacement of SM5S33CAHM3/I?
All SM5S33CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM5S33CAHM3/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 SM5S33CAHM3/I part is unused and in its original packaging.
Return procedure for SM5S33CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM5S33CAHM3/I Tags
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ESD9B5.0ST5G
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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PESD2V0Y1BSFYL
Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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