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Vishay General Semiconductor - Diodes Division SM15T18AHM3_A/I
- Part No.:
- SM15T18AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T18AHM3_A/I.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,065
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Product details
Overview
SM15T18AHM3_A/I from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, rated for 1500 W peak pulse power (10/1000 μs), 18 V standoff voltage (VWM), 25.2 V clamping voltage at 59.5 A IPPM, and AEC-Q101 qualified for automotive use. It protects MOSFETs, ICs, and sensor signal lines against lightning-induced and inductive-switching transients.
For engineers reviewing the SM15T18AHM3_A/I datasheet, SM15T18AHM3_A/I pinout, SM15T18AHM3_A/I application, or SM15T18AHM3_A/I equivalent, key selection criteria include clamping performance under 10/1000 μs surge, unidirectional polarity with cathode band marking, AEC-Q101 qualification status, and SMC package thermal resistance (RθJL = 15 °C/W).
Technical Context
The SM15T18AHM3_A/I operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its 17.1–18.9 V breakdown range (VBR at 1 mA). Its low-inductance SMC package enables fast response to transients, with clamping limited to 25.2 V at 59.5 A peak pulse current.
Designed for high-energy threat environments, it sustains 200 A non-repetitive forward surge (IFSM, 10 ms half-sine) and operates from –65 °C to +150 °C junction temperature. Thermal resistance from junction-to-lead is 15 °C/W, supporting reliable power dissipation in constrained PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 15.3 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 17.1 V / 18.9 V - Breakdown voltage range at 1 mA test current; defines turn-on threshold consistency |
| VC @ IPPM | 25.2 V at 59.5 A - Clamping voltage during 10/1000 μs surge; determines protected circuit's maximum stress level |
| PPPM | 1500 W - Peak pulse power handling capability; validates suitability for lightning and motor-switching threats |
| TJ max. | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments |
| RθJL | 15 °C/W - Junction-to-lead thermal resistance; supports effective heat transfer to PCB copper pads |
| AEC-Q101 | Qualified - Meets stress-test requirements for automotive electronics reliability and lifetime validation |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads. Cathode indicated by band marking on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry (reverse bias during clamping) | Connected to protected line side; conducts surge current toward cathode during overvoltage event |
| Cathode | Reverse-biased terminal (marked with band) | Connected to ground or low-impedance return path; establishes unidirectional clamping polarity |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 μs) | Enables robust protection against IEC 61000-4-5 Level 4 surges without derating in standard layouts |
| Low clamping ratio (VC/VBR ≈ 1.35) | Minimizes voltage overshoot across protected ICs, reducing risk of gate oxide damage in MOSFETs |
| AEC-Q101 qualification (HM3 suffix) | Validates reliability for automotive powertrain, body control, and ADAS modules requiring zero-failure field performance |
| MSL Level 1, 260 °C reflow compatible | Supports single-pass lead-free assembly without moisture sensitivity concerns or baking requirements |
| Glass passivated junction | Ensures stable leakage (<1 μA at VWM) and long-term parameter stability under thermal cycling |
Applications
| Automotive Body Control Module | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting LIN bus transceivers and microcontroller GPIOs from load-dump and alternator ripple in vehicle door modules. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between signal line and chassis ground, responding within nanoseconds to >100 V transients. Use Value: Prevents latch-up and permanent damage to 3.3 V/5 V logic interfaces while maintaining signal integrity below 25.2 V clamping threshold. | Use Scenario: Shielding 24 V DC digital input channels in programmable logic controllers from relay coil flyback and ESD events. IC Role / Device Role / Timing Role: Primary overvoltage suppression device on field-side input traces, absorbing up to 1500 W surge energy per event. Use Value: Eliminates need for secondary RC snubbers or varistors, reducing BOM count and board space while meeting IEC 61000-4-4 immunity requirements. |
| Automotive Sensor Signal Conditioning | Telecom Power Supply Input Stage |
Use Scenario: Safeguarding analog outputs of pressure and temperature sensors in engine bay environments exposed to ignition noise and load dump. IC Role / Device Role / Timing Role: Low-capacitance (typ. <100 pF) unidirectional clamp on sensor output line, preserving bandwidth up to 100 MHz. Use Value: Maintains signal fidelity for ratiometric ADC measurements while limiting fault voltage to 25.2 V during 59.5 A surge events. | Use Scenario: Front-end transient suppression on 48 V telecom rectifier inputs subjected to lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: First-line defense in multi-stage protection architecture, shunting >95 % of surge current before downstream MOVs or GDTs activate. Use Value: Extends system-level surge withstand to ≥10 kV (line-to-ground, 10/700 μs) by lowering let-through voltage to sub-30 V levels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18A-E3/57T | 600 W PPPM (vs. 1500 W); same VWM (15.3 V), higher VC (29.2 V at 20.9 A) | Limited to lower-energy threats (IEC 61000-4-2 ESD only); not suitable for lightning or motor-switching surges | Select when cost-sensitive consumer designs require basic ESD protection and board space is constrained |
| SMCJ18A-QH | 1500 W PPPM, same VWM/VC specs, but AEC-Q101 qualified with QH suffix (not HM3); different packaging and traceability | Identical electrical performance and automotive qualification; differs in lot traceability and internal manufacturing flow | Choose when supply chain requires Vishay's QH-series sourcing or specific OEM audit documentation |
Compared with SMAJ18A-E3/57T and SMCJ18A-QH, the SM15T18AHM3_A/I delivers identical clamping performance and AEC-Q101 compliance while offering halogen-free construction and optimized tape-and-reel delivery (I-pack, 3500 pcs) for high-volume automotive production.
Availability
SM15T18AHM3_A/I is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O protection, and telecom power supply input stages requiring stable component supply, AEC-Q101 compliance, and 1500 W surge resilience.
Supply support for SM15T18AHM3_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, MOSFETs, and TVS devices with emphasis on reliability, power handling, and automotive-grade qualification.
The SM15T Series is designed specifically for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom systems where failure modes must be controlled to short-circuit without fire or smoke.
FAQ
What is the clamping voltage of SM15T18AHM3_A/I at its rated peak pulse current?
The SM15T18AHM3_A/I has a maximum clamping voltage (VC) of 25.2 V when subjected to its rated peak pulse current (IPPM) of 59.5 A under the standard 10/1000 μs waveform. This value is measured per Figure 3 in the official Vishay datasheet (Doc. #88380) and defines the upper voltage limit imposed on protected circuitry during surge events. The SM15T18AHM3_A/I maintains this clamping performance across its full operating temperature range.
Is SM15T18AHM3_A/I suitable for bidirectional transient protection?
No, SM15T18AHM3_A/I is a unidirectional TVS diode, as confirmed by its "A" suffix and cathode band marking. Bidirectional variants use the "CA" suffix (e.g., SM15T18CA). Using SM15T18AHM3_A/I in bidirectional applications would result in forward conduction during negative transients, potentially damaging the device or failing to protect the circuit. Always verify polarity alignment during layout for the SM15T18AHM3_A/I.
Does SM15T18AHM3_A/I meet automotive qualification standards?
Yes, SM15T18AHM3_A/I is AEC-Q101 qualified, as indicated by the "HM3" suffix (halogen-free, RoHS-compliant, AEC-Q101 qualified). This certification covers stress tests including HTGB, HTRB, TCT, and mechanical shock, validating its suitability for automotive powertrain, body, and ADAS applications. The qualification applies specifically to the SM15T18AHM3_A/I variant-not generic SM15T18A parts.
What is the thermal resistance from junction to ambient for SM15T18AHM3_A/I?
The typical junction-to-ambient thermal resistance (RθJA) for SM15T18AHM3_A/I is 75 °C/W when mounted on 0.31" x 0.31" (8.0 mm x 8.0 mm) copper pads per terminal, per Vishay Doc. #88380. However, its junction-to-lead resistance (RθJL) is 15 °C/W-more relevant for PCB-level thermal design. For sustained power dissipation, thermal relief via copper pour and vias is recommended to maintain TJ ≤ 150 °C in the SM15T18AHM3_A/I.
How does the SM15T18AHM3_A/I differ from the SM15T18A-E3/57T variant?
The SM15T18AHM3_A/I is halogen-free, RoHS-compliant, and AEC-Q101 qualified (HM3 suffix), while SM15T18A-E3/57T is RoHS-compliant commercial grade only (E3 suffix), lacking automotive qualification and halogen-free assurance. Both share identical electrical specs (VWM = 15.3 V, VC = 25.2 V), but SM15T18AHM3_A/I is designated for automotive production with enhanced traceability and reliability testing. The "I" packing code denotes 13" tape-and-reel (3500 pcs) for the SM15T18AHM3_A/I.
SM15T18AHM3_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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 15.3V
- Voltage - Breakdown (Min):
- 17.1V
- Voltage - Clamping (Max) @ Ipp:
- 25.2V
- Current - Peak Pulse (10/1000µs):
- 59.5A
- 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)
SM15T18AHM3_A/I FAQ
1.How can I place an order for SM15T18AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T18AHM3_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 SM15T18AHM3_A/I reliable?
The price and inventory of SM15T18AHM3_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 SM15T18AHM3_A/I is usually 5 days.
3.What payment methods are accepted for SM15T18AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T18AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T18AHM3_A/I?
SM15T18AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T18AHM3_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 SM15T18AHM3_A/I?
For technical support, including SM15T18AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T18AHM3_A/I requirements.
6.How does Aetrix verify that SM15T18AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SM15T18AHM3_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 SM15T18AHM3_A/I meets industry standards.
7.What is the process for return or replacement of SM15T18AHM3_A/I?
All SM15T18AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SM15T18AHM3_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 SM15T18AHM3_A/I part is unused and in its original packaging.
Return procedure for SM15T18AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T18AHM3_A/I Tags
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