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Vishay General Semiconductor - Diodes Division SM15T33AHM3/I
- Part No.:
- SM15T33AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T33AHM3/I.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,265
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Product details
Overview
SM15T33AHM3/I from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) in SMC (DO-214AB) package, rated for 1500 W peak pulse power (10/1000 μs), 33 V standoff voltage (VWM = 28.2 V), 45.7 V clamping voltage at 33 A peak pulse current, and AEC-Q101 qualified for automotive applications. It protects MOSFETs and sensor signal lines against lightning-induced and inductive-switching transients.
For engineers reviewing the SM15T33AHM3/I datasheet, SM15T33AHM3/I pinout, SM15T33AHM3/I application, or SM15T33AHM3/I equivalent, key selection criteria include clamping performance under 10/1000 μs surge, unidirectional polarity with cathode band marking, halogen-free RoHS compliance, and automotive qualification status per ordering suffix HM3_I.
Technical Context
The SM15T33AHM3/I employs a glass-passivated silicon junction to achieve low dynamic impedance and fast response (<1 ps) to transient overvoltages. Its breakdown voltage is specified at 31.4–34.7 V with 1 mA test current, ensuring reliable turn-on before downstream IC damage.
Designed for high-source-impedance circuits, it limits peak pulse current to 33 A under 10/1000 μs waveform while maintaining clamping below 45.7 V - critical for safeguarding 3.3 V and 5 V logic interfaces. Thermal resistance is 75 °C/W junction-to-ambient on standard 8 mm × 8 mm copper pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28.2 V - maximum reverse operating voltage before leakage exceeds 1 μA; sets upper limit for normal circuit bias without conduction |
| VBR min/max | 31.4 V / 34.7 V at 1 mA - ensures predictable avalanche initiation within tight tolerance for consistent protection threshold |
| VC @ IPPM | 45.7 V at 33 A (10/1000 μs) - clamping voltage seen by protected device during worst-case surge; stays below 50 V for 3.3 V/5 V rail safety margins |
| PPPM | 1500 W - peak transient energy absorption capability; sufficient for IEC 61000-4-5 Level 4 (4 kV line-to-line) |
| TJ max | +150 °C - enables operation in under-hood automotive environments and industrial enclosures without derating |
| Package | SMC (DO-214AB) - standardized surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; compatible with automated pick-and-place |
Pinout & Package
SMC (DO-214AB) package with two terminals: anode and cathode. Cathode identified by molded band on body. No internal leads; terminals are matte tin-plated for solderability per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink node | Connected to protected circuit's ground or low-side return path; conducts surge current to reference plane during overvoltage event |
| Anode | Protected line connection | Connected directly to I/O line, power rail, or signal trace requiring clamping; forms series path with load during clamping |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 μs) | Enables robust protection against lightning surges (IEC 61000-4-5) and inductive kickback without thermal runaway |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive-grade reliability including temperature cycling, humidity testing, and mechanical shock per stress test requirements |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets EU Directive 2011/65/EU and IPC-1752A material declaration standards for environmentally sensitive supply chains |
| Low clamping ratio (VC/VBR ≈ 1.33) | Minimizes voltage overshoot across protected components, reducing risk of gate oxide rupture in MOSFETs and latch-up in CMOS ICs |
Applications
| Automotive Sensor Protection | Industrial Motor Drive I/O |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) in engine control modules exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between signal line and chassis ground to clamp negative transients and suppress positive spikes above VWM. Use Value: Prevents permanent damage to 3.3 V microcontroller inputs and maintains signal integrity during ISO 7637-2 Pulse 5a (load dump) events up to 60 V. |
Use Scenario: Safeguarding encoder feedback lines and digital I/O ports in variable-frequency drives subjected to switching noise from IGBTs and contactor bounce. IC Role / Device Role / Timing Role: Standoff-connected TVS shunting induced EMI transients on 24 V control rails before reaching PLC input stages. Use Value: Limits clamped voltage to 45.7 V, well below 60 V absolute maximum rating of industrial-grade optocouplers and level translators. |
| Consumer Power Adapter Input | Telecom Line Interface |
Use Scenario: Secondary-side transient suppression on 5 V/12 V DC output rails of wall adapters used in smart home hubs and set-top boxes. IC Role / Device Role / Timing Role: Low-leakage (≤1 μA at 28.2 V) unidirectional clamp preventing overvoltage propagation to USB-PD controllers and PMICs. Use Value: Maintains <1 μA standby current draw while delivering 1500 W surge handling - critical for Energy Star Tier 2 efficiency compliance. |
Use Scenario: Front-end protection of Ethernet PHYs and DSL line drivers connected to external wiring susceptible to induced surges. IC Role / Device Role / Timing Role: Fast-response (<1 ps) TVS placed at RJ-45 connector entry point to divert common-mode transients before differential receiver inputs. Use Value: Achieves sub-50 V clamping at 33 A, preserving signal margin for 100BASE-TX eye diagrams and avoiding false packet loss during surge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A-E3/57T | Same SMC package, 33 V VWM, but lower PPPM (400 W); non-AEC-Q101, commercial-grade only | Lacks automotive qualification and halogen-free certification; suitable for consumer-grade power supplies but not under-hood use | Select SMAJ33A-E3/57T only when cost sensitivity outweighs automotive reliability requirements and surge threat level is ≤IEC 61000-4-5 Level 2 |
| 1.5SMC33A-H | Identical electrical specs and AEC-Q101 qualification, but Littelfuse branding and HM3-equivalent packaging (halogen-free, RoHS) | Direct functional match with identical thermal and clamping behavior; validated in same automotive OEM designs | Choose 1.5SMC33A-H if dual-sourcing strategy requires second-source qualification with no design revalidation |
Compared with SMAJ33A-E3/57T, SM15T33AHM3/I delivers 275 % higher surge power handling and automotive qualification; versus 1.5SMC33A-H, it offers identical protection performance but different supply chain allocation and traceability documentation per Vishay's manufacturing lot control.
Availability
SM15T33AHM3/I is available at Aetrix Electronics and suitable for automotive sensor modules, industrial motor drive I/O protection, and telecom line interface circuits requiring stable component supply with full AEC-Q101 traceability and halogen-free compliance.
Supply support for SM15T33AHM3/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 transient protection devices with emphasis on high-reliability industrial and automotive applications.
The SM15T Series was developed specifically for high-energy transient suppression in harsh environments, targeting automotive powertrain and chassis systems where failure modes must be short-circuit safe and thermally robust.
FAQ
What is the clamping voltage of SM15T33AHM3/I at its rated peak pulse current?
The SM15T33AHM3/I has a maximum clamping voltage (VC) of 45.7 V when subjected to a 10/1000 μs waveform at its peak pulse current of 33 A. This value is measured under standard test conditions per JEDEC standards and ensures protected circuitry remains below critical voltage thresholds during surge events. The SM15T33AHM3/I achieves this with low dynamic impedance and repeatable avalanche characteristics.
Is SM15T33AHM3/I suitable for automotive applications?
Yes, SM15T33AHM3/I is AEC-Q101 qualified and manufactured with halogen-free, RoHS-compliant materials per Vishay's HM3 suffix designation. It undergoes rigorous stress testing including temperature cycling, high-temperature reverse bias, and mechanical shock - making it approved for use in engine control units, ADAS sensors, and body electronics. The SM15T33AHM3/I meets automotive-grade reliability requirements without derating at +125 °C ambient.
How does the HM3 suffix differ from the M3 or E3 suffix in SM15T33A variants?
The HM3 suffix in SM15T33AHM3/I indicates halogen-free, RoHS-compliant construction plus AEC-Q101 qualification - distinct from M3 (halogen-free/RoHS, commercial grade) and E3 (RoHS-compliant, commercial grade). The "I" denotes 13-inch tape-and-reel packaging (3500 units/reel). This makes SM15T33AHM3/I uniquely suited for automotive production where both environmental compliance and qualification are mandatory.
What is the thermal resistance of SM15T33AHM3/I, and how does it affect PCB layout?
The SM15T33AHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per terminal. To maintain safe junction temperatures during repetitive surges, designers must provide adequate copper area and avoid excessive trace length between the SM15T33AHM3/I and ground plane. Reduced pad size increases RθJA, risking thermal runaway under sustained transient stress.
Does SM15T33AHM3/I have polarity marking, and how is it identified?
Yes, SM15T33AHM3/I is unidirectional and features a molded cathode band on the SMC (DO-214AB) package body. The banded end corresponds to the cathode terminal, which must be connected toward the system ground or lower-potential reference plane. This polarity marking is visible under standard optical inspection and aligns with JEDEC DO-214AB mechanical drawings. Incorrect orientation renders the SM15T33AHM3/I ineffective for positive-going transients.
SM15T33AHM3/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:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- 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)
SM15T33AHM3/I FAQ
1.How can I place an order for SM15T33AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T33AHM3/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 SM15T33AHM3/I reliable?
The price and inventory of SM15T33AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T33AHM3/I is usually 5 days.
3.What payment methods are accepted for SM15T33AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T33AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T33AHM3/I?
SM15T33AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T33AHM3/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 SM15T33AHM3/I?
For technical support, including SM15T33AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T33AHM3/I requirements.
6.How does Aetrix verify that SM15T33AHM3/I is sourced from the original manufacturer or authorized distributors?
All SM15T33AHM3/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 SM15T33AHM3/I meets industry standards.
7.What is the process for return or replacement of SM15T33AHM3/I?
All SM15T33AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM15T33AHM3/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 SM15T33AHM3/I part is unused and in its original packaging.
Return procedure for SM15T33AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T33AHM3/I Tags
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