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Vishay General Semiconductor - Diodes Division SM15T33CAHM3_A/I
- Part No.:
- SM15T33CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T33CAHM3_A/I.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,685
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Product details
Overview
SM15T33CAHM3_A/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, rated for 1500 W peak pulse power (10/1000 μs), 33 V standoff voltage (VWM), and 45.7 V maximum clamping voltage at 33 A peak pulse current. It protects automotive-grade signal lines and power rails against lightning-induced and inductive-switching transients.
For engineers reviewing the SM15T33CAHM3_A/I datasheet, SM15T33CAHM3_A/I pinout, SM15T33CAHM3_A/I application, or SM15T33CAHM3_A/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, 150 °C junction temperature rating, low-inductance SMC package, and halogen-free RoHS compliance per ordering code HM3.
Technical Context
This device operates as a voltage-clamped surge protector with symmetrical breakdown behavior in both polarities due to its bidirectional construction. Its 33 V standoff voltage ensures compatibility with 24 V automotive supply rails while maintaining margin above normal operating voltage.
The SM15T33CAHM3_A/I delivers 1500 W peak pulse power handling under standardized 10/1000 μs waveform conditions, with clamping voltage fixed at ≤45.7 V at 33 A IPPM - enabling robust protection of downstream MOSFETs, microcontrollers, and sensor interfaces without overvoltage stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse working voltage before clamping initiates; matches 24 V system rails with 37.5 % safety margin. |
| VBR min / max | 31.4 V / 34.7 V - Breakdown occurs within this band at 1 mA test current; ensures predictable turn-on across temperature and unit variation. |
| VC @ IPPM | 45.7 V - Clamping voltage at 33 A peak pulse current; limits transient energy delivered to protected ICs to safe levels. |
| PPPM | 1500 W - Peak pulse power rating per 10/1000 μs waveform; suitable for ISO 7637-2 Pulse 1/2/5a and IEC 61000-4-5 Level 4 threats. |
| TJ max | +150 °C - Maximum junction temperature; supports under-hood automotive operation and high-ambient industrial environments. |
| Package | SMC (DO-214AB) - Surface-mount package with 7.75 mm × 6.22 mm footprint and 2.62 mm height; optimized for automated placement and thermal dissipation on 8 mm × 8 mm copper pads. |
| AEC-Q101 | Qualified - Validated for automotive applications per stress test requirements including HTOL, TCT, and ESD; ordering suffix HM3 denotes halogen-free, RoHS-compliant AEC-Q101 grade. |
Pinout & Package
SM15T33CAHM3_A/I uses the standard SMC (DO-214AB) package with two terminals: anode and cathode. As a bidirectional device, it has no polarity marking; both terminals are functionally symmetric and interchangeable in circuit layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point (negative half-cycle) | Accepts reverse surge current during negative transients; connects to protected line or ground reference depending on topology. |
| Cathode | Transient current entry point (positive half-cycle) | Accepts forward surge current during positive transients; electrically identical to anode in bidirectional configuration. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity constraints or external biasing. |
| 1500 W peak pulse power | Withstands high-energy transients from load-dump events or lightning surges without degradation when mounted per recommended pad layout. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive electronics including body control modules, ADAS sensors, and infotainment power supplies. |
| Low clamping ratio (VC/VWM = 1.39) | Minimizes overvoltage stress on protected components - critical for 3.3 V/5 V logic interfacing with 24 V systems. |
| Halogen-free & RoHS-compliant | Meets automotive OEM material compliance requirements (e.g., GMW3172, Ford WSS-M99P9999-A1) and EU environmental directives. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 24 V supply inputs of body control modules (BCM) against ISO 7637-2 Pulse 5a load-dump transients up to 60 V/100 ms. IC Role / Device Role / Timing Role: Voltage-clamping TVS diode placed between power rail and chassis ground to shunt surge current away from DC-DC converters and microcontrollers. Use Value: Limits clamped voltage to ≤45.7 V during 33 A transients, preventing latch-up or permanent damage to downstream 36 V-rated regulators and CAN transceivers. | Use Scenario: Safeguarding analog input pins of pressure/temperature sensors in factory automation PLCs exposed to inductive switching noise from solenoid valves. IC Role / Device Role / Timing Role: Bidirectional transient suppressor connected across differential sensor lines (e.g., 4–20 mA loop) to clamp common-mode and differential surges. Use Value: Maintains signal integrity by clamping transients within 10 ns response time while adding <1 pF capacitance - avoiding bandwidth reduction in kHz-range sensor signals. |
| Telecom Data Line Surge Suppression | Consumer Appliance Motor Drive Protection |
Use Scenario: Shielding RS-485 transceiver I/O pins in base station remote units from induced surges on long outdoor cabling. IC Role / Device Role / Timing Role: Bidirectional TVS placed between A/B bus lines and ground to absorb common-mode transients while preserving differential signaling integrity. Use Value: Withstands repeated 1 kV/500 A surges per IEC 61000-4-5 without parameter shift, ensuring multi-year field reliability in unattended telecom infrastructure. | Use Scenario: Protecting gate drivers and MCU GPIOs in smart washing machine motor control boards from back-EMF spikes generated by brushless DC motor commutation. IC Role / Device Role / Timing Role: Low-inductance TVS mounted directly at motor driver IC inputs to clamp fast-rising (<100 ns) inductive spikes before they propagate into logic circuits. Use Value: Achieves sub-50 V clamping at 33 A peak, preventing false triggering of overvoltage protection and eliminating need for additional RC snubbers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33CA | 600 W peak pulse power (10/1000 μs), same VWM and VC, SMA package (smaller footprint, lower thermal mass) | Limited to lower-energy threats (IEC 61000-4-2 contact discharge only); unsuitable for ISO 7637-2 or lightning-level surges | Select SMAJ33CA only for space-constrained consumer electronics where 1500 W capability is unnecessary. |
| SMCJ33CA | Identical 1500 W rating, same VWM/VC, but commercial-grade (E3/M3 suffix), not AEC-Q101 qualified | Lacks automotive qualification testing; not approved for under-hood or safety-critical vehicle subsystems | Choose SMCJ33CA for cost-sensitive industrial or telecom applications where AEC-Q101 is not mandated. |
Compared with SMAJ33CA and SMCJ33CA, the SM15T33CAHM3_A/I uniquely combines 1500 W surge capacity, AEC-Q101 qualification, and halogen-free construction - making it the only option qualified for production automotive ECUs requiring full ISO/IEC compliance and material traceability.
Availability
SM15T33CAHM3_A/I is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor systems, and telecom infrastructure requiring stable component supply, long-term lifecycle support, and certified AEC-Q101 performance.
Supply support for SM15T33CAHM3_A/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, TVS devices, and optoelectronics with emphasis on reliability and application-specific performance.
The SM15T Series is designed specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where failure modes must be controlled and clamping precision is critical.
FAQ
What does the "HM3" suffix mean in SM15T33CAHM3_A/I?
The "HM3" suffix in SM15T33CAHM3_A/I indicates halogen-free, RoHS-compliant construction with full AEC-Q101 qualification. It distinguishes this automotive-grade variant from commercial versions (E3/M3) and confirms compliance with automotive material standards and stress-test requirements including temperature cycling and highly accelerated life testing.
Is SM15T33CAHM3_A/I suitable for protecting CAN bus lines?
Yes, SM15T33CAHM3_A/I is suitable for CAN bus protection when used in conjunction with appropriate common-mode chokes and filtering. Its 33 V standoff voltage aligns with 24 V CAN FD physical layers, and its 45.7 V clamping voltage stays below the absolute maximum rating of most CAN transceivers (e.g., 58 V for TJA1042), preserving signal integrity during transients.
How does SM15T33CAHM3_A/I differ from unidirectional SM15T33A variants?
SM15T33CAHM3_A/I is bidirectional with symmetrical clamping in both polarities, whereas SM15T33A is unidirectional and requires correct polarity orientation. The CA version eliminates risk of misplacement in AC-coupled or floating circuits and supports protection of differential pairs without external biasing networks - a key advantage in sensor and data line applications.
What is the thermal resistance of SM15T33CAHM3_A/I, and how does it affect PCB layout?
SM15T33CAHM3_A/I has a typical junction-to-lead thermal resistance (RθJL) of 15 °C/W and junction-to-ambient (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads. To maintain reliability under repetitive surge conditions, PCB layout must use minimum recommended pad dimensions and avoid thermal isolation - especially critical in automotive under-hood designs operating near 125 °C ambient.
Does SM15T33CAHM3_A/I require derating at elevated ambient temperatures?
Yes, SM15T33CAHM3_A/I requires derating above 25 °C ambient per Figure 2 in the datasheet. At 85 °C ambient, its peak pulse power capability drops to approximately 70 % of the rated 1500 W. Designers must verify that worst-case surge energy remains within the derated PPPM envelope, particularly in enclosed automotive junction boxes or industrial enclosures with limited airflow.
SM15T33CAHM3_A/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- SM15T, TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 28.2V
- Voltage - Breakdown (Min):
- 31.4V
- Voltage - Clamping (Max) @ Ipp:
- 45.7V
- Current - Peak Pulse (10/1000µs):
- 33A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SM15T33CAHM3_A/I FAQ
1.How can I place an order for SM15T33CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T33CAHM3_A/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 SM15T33CAHM3_A/I reliable?
The price and inventory of SM15T33CAHM3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T33CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SM15T33CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T33CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T33CAHM3_A/I?
SM15T33CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T33CAHM3_A/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 SM15T33CAHM3_A/I?
For technical support, including SM15T33CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T33CAHM3_A/I requirements.
6.How does Aetrix verify that SM15T33CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SM15T33CAHM3_A/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 SM15T33CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SM15T33CAHM3_A/I?
All SM15T33CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SM15T33CAHM3_A/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 SM15T33CAHM3_A/I part is unused and in its original packaging.
Return procedure for SM15T33CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T33CAHM3_A/I Tags
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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