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Vishay General Semiconductor - Diodes Division SM15T39CAHM3/I
- Part No.:
- SM15T39CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T39CAHM3/I.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,091
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Product details
Overview
SM15T39CAHM3/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), 33.3 V stand-off voltage (VWM), 37.1–41.0 V breakdown voltage (VBR), and 53.9 V maximum clamping voltage (VC) at 28.0 A peak pulse current - used to protect automotive sensor signal lines against lightning-induced and inductive-switching transients.
For engineers reviewing the SM15T39CAHM3/I datasheet, SM15T39CAHM3/I pinout, SM15T39CAHM3/I application, or SM15T39CAHM3/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance, and verified performance under 10/1000 μs surge waveforms per IEC 61000-4-5.
Technical Context
This bidirectional TVS operates symmetrically across both polarities with identical VBR, VWM, and VC specifications in forward and reverse directions. Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and low dynamic impedance during transient events.
Designed for surface-mount placement on PCBs with minimum 8.0 mm × 8.0 mm copper pads per terminal, it delivers 1500 W surge handling with thermal resistance RθJA = 75 °C/W and operates from −65 °C to +150 °C junction temperature, meeting J-STD-020 MSL Level 1 reflow profile (260 °C peak).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33.3 V - maximum continuous reverse operating voltage before significant leakage begins; defines safe DC/AC signal line bias margin. |
| VBR (min/max) | 37.1 V / 41.0 V at 1.0 mA test current - guaranteed breakdown threshold range ensuring consistent turn-on during transients. |
| VC @ IPPM | 53.9 V at 28.0 A (10/1000 μs) - clamping voltage limits downstream IC stress; enables protection of 3.3 V/5 V/12 V interfaces. |
| PPPM | 1500 W - peak pulse power rating per standard 10/1000 μs waveform; validates robustness against lightning surges (IEC 61000-4-5 Level 4). |
| TJ max | +150 °C - maximum junction temperature supports under-hood automotive deployment without derating in most layouts. |
| Package | SMC (DO-214AB) - industry-standard surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; compatible with automated pick-and-place. |
Pinout & Package
SM15T39CAHM3/I uses the SMC (DO-214AB) package: a two-terminal, non-polarized surface-mount device with no marking for bidirectional types. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102, and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode/Cathode (bidirectional) | Either terminal serves as anode or cathode depending on transient polarity; symmetrical conduction eliminates orientation constraints during layout. |
| Terminal 2 | Anode/Cathode (bidirectional) | Electrically identical to Terminal 1; no polarity marking required; enables flexible PCB routing and space-constrained placements. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - required for engine control, ADAS, and body electronics. |
| Halogen-free & RoHS-compliant | Meets JEDEC JS709E and IPC-1752A material declarations; supports green manufacturing and end-of-life recycling compliance. |
| Low clamping ratio (VC/VBR) | 1.38 typical (53.9 V / 39.0 V avg) - tight voltage regulation minimizes overvoltage exposure to protected ICs during fast transients. |
| MSL Level 1 moisture sensitivity | Unlimited floor life at ≤30 °C/60% RH - eliminates bake requirements prior to reflow, reducing production cost and handling risk. |
Applications
| Automotive Sensor Protection | Industrial I/O Line Protection |
|---|---|
Use Scenario: Protecting CAN, LIN, or analog sensor outputs (e.g., pressure, temperature) in engine bays exposed to load-dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between signal line and ground, responding within <1 ns to limit transient overshoot. Use Value: Maintains signal integrity below 54 V during 28 A surges, preventing latch-up or gate oxide damage in connected microcontrollers and transceivers. |
Use Scenario: Safeguarding PLC digital input modules connected to 24 V DC field wiring subject to relay coil switching transients. IC Role / Device Role / Timing Role: Fast-response shunt protector absorbing energy before it reaches optocoupler inputs or FPGA I/O banks. Use Value: Clamps 1500 W surges without degradation over >1000 events, enabling maintenance-free operation in factory automation systems. |
| Telecom Power Interface | Consumer USB/Display Port ESD |
Use Scenario: Secondary-side transient suppression on 48 V PoE injectors and splitters where lightning-induced surges couple onto Ethernet pairs. IC Role / Device Role / Timing Role: Standoff-rated TVS placed after isolation transformer to clamp common-mode surges before DC-DC converter inputs. Use Value: Withstands repeated 10/1000 μs threats up to 1500 W while maintaining <1 μA leakage at 33.3 V - preserving efficiency and standby current budgets. |
Use Scenario: Board-level ESD and surge protection for HDMI, USB-C, or DisplayPort signal lanes in laptops and docking stations. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp integrated near connector to divert ±15 kV contact discharge per IEC 61000-4-2. Use Value: Symmetric clamping ensures equal protection for differential pairs without skew; 53.9 V clamping avoids false triggering of 3.3 V logic receivers. |
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 PPPM (400 W), same SMC package, VWM = 33 V, VC = 53.3 V @ 7.5 A - less robust for high-energy threats. | Best suited for consumer-grade ESD-only protection; insufficient for IEC 61000-4-5 Level 3+ or automotive load-dump scenarios. | Select SMAJ33CA only when system-level threat analysis confirms sub-500 W surge exposure and cost is primary constraint. |
| 1.5KE33CA | Higher PPPM (1500 W), axial DO-201 package, VWM = 28.2 V, VC = 45.7 V @ 33 A - larger footprint, manual assembly required. | Used in legacy industrial power supplies where through-hole mounting is mandated; incompatible with high-density SMT layouts. | Choose 1.5KE33CA only if board design prohibits SMT components or requires higher creepage/clearance than SMC allows. |
Compared with SMAJ33CA and 1.5KE33CA, SM15T39CAHM3/I uniquely combines AEC-Q101 qualification, halogen-free construction, and full 1500 W capability in an SMC package - making it the only option qualified for next-generation automotive and industrial SMT designs requiring zero rework and long-term supply stability.
Availability
SM15T39CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom PoE injectors, and consumer display interface protection requiring stable component supply across multi-year production cycles.
Supply support for SM15T39CAHM3/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, MOSFETs, and protection devices with emphasis on reliability, power efficiency, and automotive-grade validation.
The SM15T Series is designed specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where AEC-Q101 qualification, 1500 W surge capacity, and SMT manufacturability are mandatory.
FAQ
What is the clamping voltage of SM15T39CAHM3/I at its rated peak pulse current?
The SM15T39CAHM3/I has a maximum clamping voltage (VC) of 53.9 V at 28.0 A peak pulse current with a 10/1000 μs waveform. This value is measured under standardized test conditions per JEDEC standards and guarantees that protected circuitry will not experience voltages exceeding 53.9 V during specified surge events. The SM15T39CAHM3/I maintains this clamping performance across its full operating temperature range.
Is SM15T39CAHM3/I suitable for automotive applications?
Yes, SM15T39CAHM3/I is AEC-Q101 qualified and manufactured with halogen-free, RoHS-compliant materials under Vishay's automotive-grade process flow. Its SMC package, −65 °C to +150 °C operating range, and validated performance under ISO 7637-2 and IEC 61000-4-5 make SM15T39CAHM3/I appropriate for engine control units, ADAS sensors, and body electronics where reliability under thermal and electrical stress is critical.
How does the bidirectional configuration of SM15T39CAHM3/I affect PCB layout?
The bidirectional nature of SM15T39CAHM3/I eliminates polarity marking and orientation constraints - either terminal functions identically as anode or cathode depending on transient polarity. This simplifies PCB layout by removing the need for silkscreen polarity indicators, reduces assembly errors, and allows symmetric routing in differential or AC-coupled signal paths. No cathode band is present on SM15T39CAHM3/I.
What is the thermal resistance of SM15T39CAHM3/I, and how does it impact power dissipation?
SM15T39CAHM3/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. At ambient temperatures up to 50 °C, its steady-state power dissipation (PD) is rated at 6.5 W. This RθJA value informs heatsinking requirements: for example, at 1 W continuous dissipation, junction temperature rise is ~75 °C above ambient - confirming suitability for unheatsinked operation in most automotive and industrial enclosures.
Does SM15T39CAHM3/I meet moisture sensitivity level (MSL) requirements for lead-free reflow?
Yes, SM15T39CAHM3/I meets J-STD-020 MSL Level 1 with a maximum peak reflow temperature of 260 °C. This means it has unlimited floor life at ≤30 °C and ≤60% relative humidity, eliminating the need for dry-packaging, baking, or special handling prior to SMT reflow. The MSL Level 1 rating is confirmed in Vishay's official documentation and applies to all HM3 suffix variants including SM15T39CAHM3/I.
SM15T39CAHM3/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):
- 33.3V
- Voltage - Breakdown (Min):
- 37.1V
- Voltage - Clamping (Max) @ Ipp:
- 53.9V
- Current - Peak Pulse (10/1000µs):
- 28A
- 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)
SM15T39CAHM3/I FAQ
1.How can I place an order for SM15T39CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T39CAHM3/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 SM15T39CAHM3/I reliable?
The price and inventory of SM15T39CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T39CAHM3/I is usually 5 days.
3.What payment methods are accepted for SM15T39CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T39CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T39CAHM3/I?
SM15T39CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T39CAHM3/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 SM15T39CAHM3/I?
For technical support, including SM15T39CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T39CAHM3/I requirements.
6.How does Aetrix verify that SM15T39CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SM15T39CAHM3/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 SM15T39CAHM3/I meets industry standards.
7.What is the process for return or replacement of SM15T39CAHM3/I?
All SM15T39CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM15T39CAHM3/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 SM15T39CAHM3/I part is unused and in its original packaging.
Return procedure for SM15T39CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T39CAHM3/I Tags
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Diodes Incorporated
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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