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Vishay General Semiconductor - Diodes Division SM15T18AHM3/I
- Part No.:
- SM15T18AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T18AHM3/I.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,008
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Product details
Overview
SM15T18AHM3/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), 15.3 V stand-off voltage (VWM), 17.1–18.9 V breakdown voltage (VBR at 1 mA), and 25.2 V maximum clamping voltage (VC) at 59.5 A peak pulse current. It protects MOSFETs and signal lines in automotive sensor units against inductive switching transients.
For engineers reviewing the SM15T18AHM3/I datasheet, SM15T18AHM3/I pinout, SM15T18AHM3/I application, or SM15T18AHM3/I equivalent, key selection criteria include clamping voltage margin relative to protected IC's absolute maximum rating, unidirectional polarity alignment with DC bias, thermal resistance (RθJA = 75 °C/W), and AEC-Q101 qualification status for automotive deployment.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under normal bias (≤15.3 V), it exhibits ≤1.0 μA reverse leakage; when transient voltage exceeds 17.1 V, it avalanches to clamp at ≤25.2 V within nanoseconds. Its glass-passivated junction ensures stable breakdown and low inductance for fast response.
The device is designed for high-impedance source environments-e.g., I/O lines or sensor interfaces-where system-level source impedance limits surge current within its 59.5 A IPPM rating. Failure mode under overstress is short-circuit, compatible with fuse-based system-level fault containment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 15.3 V - Maximum continuous reverse operating voltage before leakage exceeds 1.0 μA; sets upper limit for safe DC bias in protected circuit. |
| VBR (min/max) | 17.1 V / 18.9 V at 1 mA - Confirmed avalanche initiation range; ensures reliable turn-on before downstream IC damage threshold. |
| VC @ IPPM | 25.2 V at 59.5 A (10/1000 μs) - Clamped voltage seen by protected device during worst-case surge; must be below IC's absolute max rating. |
| PPPM | 1500 W - Peak transient energy handling capacity; sufficient for lightning-induced surges per IEC 61000-4-5 Level 3 (1 kV line-to-ground). |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance on standard 8 mm × 8 mm copper pads; determines steady-state power derating above 25 °C. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments with proper layout. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD; suffix HM3 denotes halogen-free, RoHS-compliant AEC-Q101 version. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. Cathode indicated by band marking; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink node | Connected to protected line; conducts surge current to ground when voltage exceeds VBR; polarity must match DC bias direction. |
| Anode (unmarked end) | Reference/return path | Typically tied to system ground or low-impedance return; completes shunt path during clamping event. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 μs) | Enables robust protection against IEC 61000-4-5 lightning surges without external series impedance. |
| Low clamping ratio (VC/VBR ≈ 1.48) | Minimizes overvoltage stress on protected ICs-critical for 3.3 V or 5 V logic interfaces with tight voltage margins. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive applications including engine control modules and ADAS sensor interfaces requiring long-term reliability. |
| MSL Level 1 (260 °C peak reflow) | Supports standard lead-free SMT assembly without moisture sensitivity concerns or baking requirements. |
| Glass-passivated junction | Ensures stable VBR over lifetime and improved resistance to humidity-induced parameter drift. |
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 bay modules exposed to load dump and inductive kick. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between signal line and chassis ground, clamping transients faster than system response time. Use Value: Prevents latch-up or gate oxide damage in transceivers by limiting voltage to ≤25.2 V during 59.5 A surges-within safe margin of 30 V absolute max ratings. |
Use Scenario: Safeguarding PLC analog input channels connected to 24 V industrial sensors subject to relay coil switching transients. IC Role / Device Role / Timing Role: Standoff-rated TVS on each channel input, absorbing repetitive 10/1000 μs surges up to 1500 W without degradation. Use Value: Maintains signal integrity by holding leakage <1.0 μA at 15.3 V, avoiding offset errors in 16-bit ADC front-ends. |
| Consumer Power Adapter Interface | Telecom Line Card Surge Protection |
Use Scenario: Input-side transient suppression on USB-C PD port power paths where 20 V nominal rails require precise overvoltage control. IC Role / Device Role / Timing Role: Primary clamping device upstream of buck controller, activated within <1 ns to divert surge before controller shutdown. Use Value: Leverages 75 °C/W RθJA to sustain 6.5 W continuous dissipation during brown-out recovery, preventing thermal runaway. |
Use Scenario: Secondary protection on Ethernet PHY interface lines (e.g., RJ45 magnetics secondary side) subjected to induced surges from nearby AC wiring. IC Role / Device Role / Timing Role: Low-capacitance unidirectional TVS (CJ < 100 pF at 0 V) minimizing signal distortion on 100BASE-TX differential pairs. Use Value: Achieves <10.0 ns response time and clamps to 25.2 V-below PHY IC's 28 V abs max-without degrading 100 MHz bandwidth. |
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 | Same SMC package, 1500 W rating, but VWM = 15.4 V, VC = 29.2 V at 51.7 A; not AEC-Q101 qualified. | Lacks automotive qualification; higher clamping voltage reduces safety margin for 3.3 V/5 V ICs. | Select when cost sensitivity outweighs AEC-Q101 requirement and clamping margin ≥3.0 V is acceptable. |
| 1.5SMC18A-H | Identical electrical specs (VWM = 15.3 V, VC = 25.2 V), same SMC package, but AEC-Q101 qualified only in HE3/HM3 variants-not H suffix. | H-suffix part lacks formal AEC-Q101 validation; may require additional customer qualification for automotive use. | Choose SM15T18AHM3/I when production requires documented AEC-Q101 compliance with halogen-free materials. |
Compared with SMAJ18A-E3/57T and 1.5SMC18A-H, SM15T18AHM3/I provides verified AEC-Q101 qualification, tighter clamping (25.2 V vs. 29.2 V), and halogen-free construction-making it the preferred choice for Tier-1 automotive sensor modules requiring zero-defect reliability and regulatory compliance.
Availability
SM15T18AHM3/I is available at Aetrix Electronics and suitable for automotive sensor units, industrial PLC I/O modules, and telecom line card designs requiring stable component supply, AEC-Q101 compliance, and repeatable 1500 W surge immunity.
Supply support for SM15T18AHM3/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 protection devices with emphasis on reliability, power efficiency, and automotive-grade qualification.
The SM15T Series was developed specifically for high-energy transient suppression in harsh environments-targeting automotive, industrial, and telecom applications where failure modes must be predictable and clamping performance tightly controlled.
FAQ
What is the clamping voltage of SM15T18AHM3/I at its rated peak pulse current?
The SM15T18AHM3/I has a maximum clamping voltage (VC) of 25.2 V when subjected to its rated peak pulse current of 59.5 A using the standard 10/1000 μs waveform. This value is measured under specified test conditions (TA = 25 °C, mounted on 8.0 mm × 8.0 mm copper pads) and defines the upper voltage limit imposed on protected circuitry during surge events. The SM15T18AHM3/I maintains this clamping performance across its operational temperature range.
Is SM15T18AHM3/I suitable for bidirectional transient protection?
No, SM15T18AHM3/I is a unidirectional TVS diode, as indicated by the "A" suffix and cathode band marking. For bidirectional protection, Vishay specifies the "CA" suffix (e.g., SM15T18CA). Using SM15T18AHM3/I on AC-coupled or bipolar signal lines would result in forward conduction during negative half-cycles, potentially damaging the device or circuit. Always verify polarity alignment before integrating SM15T18AHM3/I into the design.
Does SM15T18AHM3/I meet automotive qualification standards?
Yes, SM15T18AHM3/I is explicitly AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3", which denotes halogen-free, RoHS-compliant, and AEC-Q101-qualified construction. This qualification covers stress tests including temperature cycling, high-temperature reverse bias, and ESD-making SM15T18AHM3/I suitable for under-hood automotive applications such as engine control units and radar sensor modules.
What is the thermal resistance of SM15T18AHM3/I, and how does it affect layout?
The SM15T18AHM3/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. To maintain safe junction temperatures under continuous power dissipation, PCB layout must provide adequate copper area and thermal vias. Reducing pad size or omitting thermal relief increases RθJA, risking thermal runaway-especially critical for SM15T18AHM3/I's 6.5 W power dissipation rating at TA = 50 °C.
How does the glass passivation in SM15T18AHM3/I improve long-term reliability?
The glass-passivated chip junction in SM15T18AHM3/I provides superior environmental stability compared to epoxy-passivated alternatives-reducing parameter drift due to humidity, temperature cycling, and long-term bias stress. This directly enhances VBR consistency and leakage current stability over the device's lifetime, a critical factor for automotive and industrial applications where field failures must be minimized. SM15T18AHM3/I leverages this feature to meet AEC-Q101's stringent lifetime reliability requirements.
SM15T18AHM3/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):
- 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/I FAQ
1.How can I place an order for SM15T18AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T18AHM3/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/I reliable?
The price and inventory of SM15T18AHM3/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/I is usually 5 days.
3.What payment methods are accepted for SM15T18AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T18AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T18AHM3/I?
SM15T18AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T18AHM3/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/I?
For technical support, including SM15T18AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T18AHM3/I requirements.
6.How does Aetrix verify that SM15T18AHM3/I is sourced from the original manufacturer or authorized distributors?
All SM15T18AHM3/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/I meets industry standards.
7.What is the process for return or replacement of SM15T18AHM3/I?
All SM15T18AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM15T18AHM3/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/I part is unused and in its original packaging.
Return procedure for SM15T18AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T18AHM3/I Tags
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