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Vishay General Semiconductor - Diodes Division SM15T39AHM3/I
- Part No.:
- SM15T39AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T39AHM3/I.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,955
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Product details
Overview
SM15T39AHM3/I from Vishay General Semiconductor is a unidirectional 1500 W transient voltage suppressor (TVS) in SMC (DO-214AB) package, with 33.3 V stand-off voltage (VWM), 37.1–41.0 V breakdown voltage (VBR at 1 mA), and 53.9 V clamping voltage (VC) at 28.0 A peak pulse current - designed to protect MOSFETs, ICs, and sensor signal lines against lightning-induced and inductive-switching transients in automotive and industrial power electronics.
For engineers reviewing the SM15T39AHM3/I datasheet, SM15T39AHM3/I pinout, SM15T39AHM3/I application, or SM15T39AHM3/I equivalent, key selection criteria include its AEC-Q101 qualification, halogen-free RoHS-compliant construction, 150 °C max junction temperature, low-inductance SMC package, and verified clamping performance under 10/1000 μs waveform stress.
Technical Context
The SM15T39AHM3/I operates as a unidirectional avalanche diode with glass-passivated junction, optimized for high-energy transient suppression where source impedance limits peak current within its 28.0 A IPPM rating. Its thermal resistance (RθJA = 75 °C/W) and RθJL = 15 °C/W support reliable operation on standard 8.0 mm × 8.0 mm copper pads without forced cooling.
It delivers stable clamping down to -65 °C and up to +150 °C, with <1.0 μA reverse leakage at VWM, and meets J-STD-020 MSL Level 1 (260 °C peak reflow). The cathode-band polarity marking enables unambiguous PCB orientation during automated placement.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33.3 V - maximum continuous reverse operating voltage before conduction begins; defines safe signal line bias margin |
| VBR (min/max) | 37.1 V / 41.0 V at 1.0 mA - guaranteed avalanche onset range; ensures consistent turn-on across production lots |
| VC @ IPPM | 53.9 V at 28.0 A (10/1000 μs) - peak clamped voltage seen by protected circuit; determines downstream voltage stress |
| PPPM | 1500 W - peak pulse power handling capacity; validates suitability for lightning surge (IEC 61000-4-5 Level 4) protection |
| TJ max | +150 °C - maximum junction temperature; supports under-hood automotive and high-ambient industrial deployments |
| Package | SMC (DO-214AB) - surface-mount outline with 7.75 mm × 6.22 mm footprint; compatible with standard SMT pick-and-place and reflow profiles |
Pinout & Package
SM15T39AHM3/I uses the SMC (DO-214AB) package: molded epoxy case with matte tin-plated leads, 0.320" (8.13 mm) overall length, 0.246" (6.22 mm) width, and cathode band marking on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-impedance return path; forms current loop during transient clamp event |
| Cathode | High-side transient input terminal | Connected to protected line (e.g., 24 V supply rail or CAN H); absorbs surge energy into ground via anode |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive powertrain and body electronics per stress test requirements (HTOL, TC, UHAST, etc.) |
| Halogen-free & RoHS-compliant | Meets JEDEC JESD201 Class 2 whisker resistance and EU Directive 2011/65/EU material restrictions |
| 1500 W peak pulse power | Withstands 10/1000 μs surges up to 28.0 A without degradation - sufficient for ISO 7637-2 Pulse 5a/b and IEC 61000-4-5 combination wave testing |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes overvoltage exposure to downstream ICs; improves system-level robustness vs. higher-ratio TVS devices |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking; reduces manufacturing overhead and risk of popcorning |
Applications
| Automotive Power Distribution | Industrial Motor Drive Inputs |
|---|---|
Use Scenario: Protection of 24 V battery-fed ECUs, junction boxes, and lighting modules against load-dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC converter input to clamp surges before they reach regulation circuitry. Use Value: Prevents latch-up or permanent damage to buck controllers rated for ≤45 V absolute max input, leveraging 53.9 V clamping at 28 A. |
Use Scenario: Guarding PLC analog input channels and digital I/O lines connected to solenoid valves and contactors. IC Role / Device Role / Timing Role: Standoff-mode protector on 24 V sensor supply lines, conducting only during >33.3 V transients induced by coil de-energization. Use Value: Maintains signal integrity during repetitive switching events (e.g., 10 Hz valve cycling) with <1.0 μA leakage at nominal voltage. |
| Telecom Power Interface | Consumer Appliance Control Boards |
Use Scenario: Safeguarding PoE-powered Ethernet switch ports and base station RF front-end supplies from induced surges on long cable runs. IC Role / Device Role / Timing Role: Primary-level TVS on 48 V DC input stage, coordinated with secondary-stage polymer PTCs for multi-tier protection. Use Value: Enables compliance with GR-1089-CORE Section 4.5.2 (lightning surge) using single-device solution with 1500 W rating. |
Use Scenario: Shielding microcontroller GPIOs and relay drivers in washing machines and HVAC controllers from motor-commutation noise. IC Role / Device Role / Timing Role: Localized clamp adjacent to relay coil flyback diode, absorbing residual energy that bypasses snubber networks. Use Value: Eliminates need for external RC snubbers in cost-sensitive designs while maintaining 150 °C operational margin near heat-generating components. |
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 | Lower PPPM (400 W), smaller SMA package, VC = 53.3 V @ 7.5 A, non-AEC-Q101 | Suitable for consumer-grade, low-energy I/O protection; insufficient for automotive load-dump duty cycle | Select when board space is constrained and surge threat level is limited to IEC 61000-4-2 ESD only |
| 1.5KE33A | Higher VC (55.5 V @ 27.0 A), axial DO-201AD package, no AEC-Q101, higher RθJA (100 °C/W) | Requires through-hole assembly; less suitable for high-volume SMT lines and thermally dense layouts | Choose only for legacy through-hole designs where rework to SMT is not feasible |
Compared with SMAJ33A-E3/57T and 1.5KE33A, SM15T39AHM3/I provides 3.75× higher peak power handling, AEC-Q101 qualification for automotive use, and superior thermal performance in SMT format - making it the preferred choice for new industrial and vehicle platform designs requiring field-proven reliability under repetitive surge stress.
Availability
SM15T39AHM3/I is available at Aetrix Electronics and suitable for automotive ECU protection, industrial PLC I/O conditioning, and telecom power interface hardening requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SM15T39AHM3/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, and optoelectronics with emphasis on reliability, power efficiency, and application-specific validation.
The SM15T Series was engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where failure modes must be predictable (short-circuit) and performance must remain stable across temperature and lifetime.
FAQ
What is the clamping voltage of SM15T39AHM3/I at its rated peak pulse current?
The SM15T39AHM3/I has a maximum clamping voltage (VC) of 53.9 V when subjected to a 10/1000 μs waveform at its rated peak pulse current of 28.0 A. This value is measured under standardized test conditions with 0.31" × 0.31" copper pads per terminal and is guaranteed across the full operating temperature range. The SM15T39AHM3/I maintains this clamping performance without parameter shift after repeated surge events within datasheet limits.
Is SM15T39AHM3/I qualified for automotive applications?
Yes, SM15T39AHM3/I is AEC-Q101 qualified, as indicated by the "HM3" suffix denoting halogen-free, RoHS-compliant, and automotive-grade construction. It has passed stress tests including high-temperature operating life (HTOL), temperature cycling (TC), and unbiased highly accelerated stress test (UHAST), confirming suitability for under-hood and chassis-mounted automotive electronics per the AEC-Q101 standard.
What does the "I" suffix mean in SM15T39AHM3/I?
The "I" suffix in SM15T39AHM3/I specifies the packaging configuration: 13-inch diameter plastic tape and reel with a base quantity of 3500 units. This format supports high-volume SMT assembly lines and is compatible with standard 12-mm tape feeders. The "HM3" portion confirms halogen-free, RoHS-compliant, and AEC-Q101-qualified construction, while "A" denotes unidirectional polarity.
How does SM15T39AHM3/I differ from bidirectional TVS diodes like SM15T39CA?
SM15T39AHM3/I is unidirectional and features a cathode band for polarity identification, enabling use in DC circuits where reverse voltage blocking is required. In contrast, SM15T39CA is bidirectional with no polarity marking and symmetric clamping in both directions - suitable for AC lines or data buses like RS-485. The SM15T39AHM3/I exhibits lower leakage (<1.0 μA at VWM) than its bidirectional counterpart under the same bias condition.
What is the thermal resistance of SM15T39AHM3/I, and how does it affect layout design?
The SM15T39AHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. This value assumes no additional heatsinking; designers must allocate adequate copper area and avoid thermal bottlenecks in traces connecting anode/cathode to planes. Exceeding 150 °C junction temperature risks parametric shift or premature failure, especially under repetitive surge duty cycles.
SM15T39AHM3/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):
- 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)
SM15T39AHM3/I FAQ
1.How can I place an order for SM15T39AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T39AHM3/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 SM15T39AHM3/I reliable?
The price and inventory of SM15T39AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T39AHM3/I is usually 5 days.
3.What payment methods are accepted for SM15T39AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T39AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T39AHM3/I?
SM15T39AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T39AHM3/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 SM15T39AHM3/I?
For technical support, including SM15T39AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T39AHM3/I requirements.
6.How does Aetrix verify that SM15T39AHM3/I is sourced from the original manufacturer or authorized distributors?
All SM15T39AHM3/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 SM15T39AHM3/I meets industry standards.
7.What is the process for return or replacement of SM15T39AHM3/I?
All SM15T39AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM15T39AHM3/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 SM15T39AHM3/I part is unused and in its original packaging.
Return procedure for SM15T39AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T39AHM3/I Tags
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