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Vishay General Semiconductor - Diodes Division SM15T33CAHM3/I
- Part No.:
- SM15T33CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T33CAHM3/I.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,421
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Product details
Overview
SM15T33CAHM3/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 clamping voltage of 59.0 V at 169 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/I datasheet, SM15T33CAHM3/I pinout, SM15T33CAHM3/I application, or SM15T33CAHM3/I equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, clamping performance under 10/1000 μs stress, thermal resistance (RθJA = 75 °C/W), and halogen-free RoHS-compliant construction per JESD 201 Class 2 whisker test.
Technical Context
This bidirectional TVS operates symmetrically across both polarities with breakdown voltage (VBR) of 37.1–41.0 V at 1 mA test current and maximum reverse leakage (ID) ≤1.0 μA at 28.2 V standoff. Its low-inductance SMC package enables fast response to transients while maintaining clamping stability up to 150 °C junction temperature.
The device features glass-passivated chip junction, meets MSL Level 1 per J-STD-020 (peak reflow 260 °C), and is qualified to AEC-Q101 for automotive applications. Failure mode under overstress is short-circuit, ensuring system-level fault containment without open-circuit risk.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28.2 V - Maximum continuous reverse operating voltage before significant leakage; defines safe working margin below clamping threshold |
| VBR min/max | 37.1 V / 41.0 V at 1 mA - Confirmed bidirectional breakdown range; ensures symmetrical overvoltage triggering |
| VC @ IPPM | 59.0 V at 169 A (10/1000 μs) - Measured clamping voltage; determines protected circuit's maximum transient exposure level |
| PPPM | 1500 W - Peak pulse power handling capability; supports high-energy lightning surge immunity per IEC 61000-4-5 |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance on standard 8 mm × 8 mm copper pads; informs derating above 25 °C ambient |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments |
| Package | SMC (DO-214AB) - Surface-mount outline with 7.75 mm × 6.22 mm footprint; compatible with automated placement and reflow |
Pinout & Package
SM15T33CAHM3/I uses a two-terminal SMC (DO-214AB) package with no polarity marking for bidirectional operation. Terminals are matte tin-plated and solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point (either polarity) | Accepts surge current during positive or negative voltage excursions; symmetric conduction path |
| Cathode | Transient current exit point (either polarity) | Completes bidirectional clamping loop; no fixed polarity-functions identically to Anode under reverse bias |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements; supports under-hood and ADAS sensor line protection |
| Halogen-free & RoHS-compliant | Meets Vishay HM3 material categorization; satisfies EU environmental compliance and JESD 201 Class 2 whisker resistance |
| 1500 W peak pulse power | Withstands 10/1000 μs surges up to 169 A-sufficient for IEC 61000-4-5 Level 4 (4 kV) testing on 2 Ω source impedance |
| Low clamping ratio (VC/VWM ≈ 2.09) | Minimizes overvoltage stress on downstream ICs; critical for protecting 3.3 V or 5 V logic interfaces |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life before reflow; eliminates bake requirements and simplifies SMT manufacturing flow |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN, LIN, or analog sensor signal lines (e.g., temperature, pressure) in engine control units and body modules. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between signal line and ground to shunt ESD and load-dump transients. Use Value: Prevents latch-up or damage to 3.3 V/5 V microcontrollers and analog front-ends during ISO 16750-2 load dump (up to 35 V) and ISO 10605 ESD events. |
Use Scenario: Safeguarding digital input/output terminals of programmable logic controllers exposed to motor switching noise and field wiring surges. IC Role / Device Role / Timing Role: Transient suppression element across 24 V DC I/O lines to limit voltage excursion during inductive kickback. Use Value: Enables reliable operation in factory automation where 1500 W surge rating handles repetitive 10/1000 μs transients from solenoid valves and contactors. |
| Telecom Power Rail Protection | Consumer USB Port Protection |
Use Scenario: Clamping 48 V DC power rails in PoE-powered network switches and base station RF modules. IC Role / Device Role / Timing Role: Secondary overvoltage protection stage after primary DC-DC converter, absorbing residual surges from AC mains coupling. Use Value: Maintains rail integrity during lightning-induced surges on outdoor telecom infrastructure; RθJA = 75 °C/W supports natural convection cooling. |
Use Scenario: Protecting USB 2.0 data lines and VBUS in smart home hubs and portable audio devices against human-body-model ESD. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp placed directly at connector to minimize stub length and preserve signal integrity. Use Value: Delivers <1.0 μA leakage at 28.2 V, preventing battery drain in always-on consumer devices while meeting IEC 61000-4-2 Level 4 (15 kV air). |
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 | Lower peak pulse power (400 W), same VWM (28.2 V), SMA package (smaller footprint, higher RθJA = 110 °C/W) | Suitable for space-constrained consumer PCBs but not for automotive or industrial surge levels requiring 1500 W | Select SMAJ33CA only when board area is critical and surge threat is limited to IEC 61000-4-2 ESD, not lightning or load dump. |
| 1.5KE33CA | Higher peak pulse power (1500 W), axial-leaded DO-201 package, larger size, lower thermal performance (RθJA ≈ 100 °C/W) | Used in through-hole legacy designs; incompatible with automated SMT assembly and high-density layouts | Choose 1.5KE33CA only for prototyping or repair of existing through-hole systems where rework is acceptable. |
Compared with SMAJ33CA and 1.5KE33CA, SM15T33CAHM3/I uniquely combines AEC-Q101 qualification, halogen-free construction, SMC surface-mount compatibility, and 1500 W surge capacity-making it the only option validated for production automotive SMT lines requiring full IEC 61000-4-5 compliance.
Availability
SM15T33CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom power rails, and consumer USB port protection requiring stable component supply and long-term lifecycle support.
Supply support for SM15T33CAHM3/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 MOSFETs with emphasis on reliability, power efficiency, and automotive-grade qualification.
The SM15T Series is designed specifically for high-energy transient suppression in automotive, industrial, and telecom systems-delivering robust 1500 W surge handling in compact SMC packages with AEC-Q101 validation.
FAQ
What does the "HM3" suffix indicate in SM15T33CAHM3/I?
The "HM3" suffix in SM15T33CAHM3/I denotes halogen-free, RoHS-compliant construction qualified to AEC-Q101, with JESD 201 Class 2 whisker resistance and MSL Level 1 rating. It confirms the device meets automotive environmental and reliability standards beyond commercial-grade variants like "E3" or "M3".
Is SM15T33CAHM3/I unidirectional or bidirectional?
SM15T33CAHM3/I is a bidirectional TVS diode, indicated by the "CA" suffix. It provides symmetrical clamping for both positive and negative transients without polarity marking on the SMC package, making it ideal for AC-coupled or differential signal lines.
What is the clamping voltage of SM15T33CAHM3/I at its rated peak pulse current?
The clamping voltage of SM15T33CAHM3/I is 59.0 V at 169 A peak pulse current with a 10/1000 μs waveform. This value is measured per Figure 1 in Vishay document 88380 and defines the maximum voltage imposed on protected circuitry during worst-case surge conditions.
Does SM15T33CAHM3/I require special PCB layout considerations?
Yes-SM15T33CAHM3/I must be mounted on minimum recommended 8.0 mm × 8.0 mm copper pads per terminal to achieve specified thermal resistance (RθJA = 75 °C/W) and peak pulse current rating. Short, direct traces to ground plane are essential to minimize inductance and preserve clamping speed.
How does SM15T33CAHM3/I differ from SM15T33A variants?
SM15T33CAHM3/I differs from unidirectional SM15T33A by its bidirectional functionality (CA suffix), absence of cathode band marking, and identical electrical specs except for polarity behavior. The HM3/I suffix adds halogen-free, AEC-Q101, and 13-inch tape-and-reel packaging-unlike commercial E3/M3 variants.
SM15T33CAHM3/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:
- -
- 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/I FAQ
1.How can I place an order for SM15T33CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T33CAHM3/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/I reliable?
The price and inventory of SM15T33CAHM3/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/I is usually 5 days.
3.What payment methods are accepted for SM15T33CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T33CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T33CAHM3/I?
SM15T33CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T33CAHM3/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/I?
For technical support, including SM15T33CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T33CAHM3/I requirements.
6.How does Aetrix verify that SM15T33CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SM15T33CAHM3/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/I meets industry standards.
7.What is the process for return or replacement of SM15T33CAHM3/I?
All SM15T33CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM15T33CAHM3/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/I part is unused and in its original packaging.
Return procedure for SM15T33CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T33CAHM3/I Tags
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