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Vishay General Semiconductor - Diodes Division SM15T18CAHM3_A/I
- Part No.:
- SM15T18CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T18CAHM3_A/I.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,496
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Product details
Overview
SM15T18CAHM3_A/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), 18 V standoff voltage (VWM), and 25.2 V clamping voltage (VC) at 59.5 A peak pulse current. It protects signal lines and power rails in automotive sensor interfaces against lightning-induced and inductive-switching transients.
For engineers reviewing the SM15T18CAHM3_A/I datasheet, SM15T18CAHM3_A/I pinout, SM15T18CAHM3_A/I application, or SM15T18CAHM3_A/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance, low clamping ratio (VC/VWM = 1.4), and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
This device operates as a voltage-clamped surge protector with symmetrical breakdown behavior in both polarities due to its bidirectional construction. Its glass-passivated junction ensures stable leakage performance (<1.0 μA at VWM) and robust ESD immunity, while low inductance supports fast transient response under 10/1000 μs waveforms.
Designed for high-reliability environments, SM15T18CAHM3_A/I features MSL Level 1 moisture sensitivity, 260 °C lead-free reflow compatibility, and thermal resistance of 75 °C/W (junction-to-ambient) when mounted per recommended pad layout - enabling sustained operation up to 150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working range for protected circuitry. |
| VBR min/max | 17.1 V / 18.9 V at 1.0 mA - Confirmed breakdown threshold ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | 25.2 V at 59.5 A (10/1000 μs) - Clamping voltage limits downstream component stress during worst-case surge conditions. |
| PPPM | 1500 W - Peak pulse power rating determines survivability against lightning and inductive switching transients. |
| IFSM | Not applicable - Bidirectional configuration excludes forward surge current rating (unidirectional only). |
| TJ max | +150 °C - Maximum junction temperature enables use in under-hood automotive and industrial ambient environments. |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height for automated assembly. |
Pinout & Package
SM15T18CAHM3_A/I uses the SMC (DO-214AB) package: a two-terminal, symmetrical, bidirectional device with no polarity marking. Terminals are matte tin-plated leads solderable per J-STD-002 and JESD 22-B102, optimized for low-inductance PCB layout with 8.0 mm × 8.0 mm copper pads per terminal.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point (negative polarity) | Accepts reverse surge current during negative transients; identical electrical behavior to Cathode due to bidirectional symmetry. |
| Cathode | Transient current entry point (positive polarity) | Accepts reverse surge current during positive transients; functionally interchangeable with Anode in CA-series devices. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity constraints. |
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JEDEC standards. |
| Halogen-free & RoHS-compliant | Meets global environmental regulations and supports lead-free reflow profiles up to 260 °C peak. |
| Low clamping ratio (VC/VWM) | 1.4 - Minimizes voltage overshoot during clamping, reducing risk of damage to downstream ICs and MOSFETs. |
| MSL Level 1 | Unlimited floor life at ≤30 °C/60% RH - eliminates bake requirements prior to SMT assembly. |
Applications
| Automotive Sensor Protection | Industrial I/O Line Protection |
|---|---|
Use Scenario: Protecting CAN bus transceivers and analog sensor outputs (e.g., pressure, temperature) in engine control units exposed to load-dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Voltage-clamping TVS diode placed across differential signal pair or supply rail to shunt transient energy before it reaches sensitive interface ICs. Use Value: Prevents latch-up or permanent damage in AEC-Q100 qualified microcontrollers and analog front-ends by limiting clamped voltage to 25.2 V during 59.5 A surges. | Use Scenario: Safeguarding PLC digital input modules connected to 24 V DC field wiring subject to inductive kickback from solenoid valves and contactors. IC Role / Device Role / Timing Role: Bidirectional transient suppressor installed between input line and common reference to clamp both positive and negative polarity spikes. Use Value: Maintains functional integrity of optocoupler inputs and level-shifting logic by holding clamped voltage below 25.2 V even during repetitive 10/1000 μs transients. |
| Telecom Power Rail Protection | Consumer USB Port ESD Protection |
Use Scenario: Guarding 12 V backup power supplies in VoIP gateways and base stations against lightning-induced surges entering via Ethernet or AC adapter lines. IC Role / Device Role / Timing Role: Primary-level TVS placed at board edge to absorb bulk surge energy before it propagates into DC-DC converters and PMICs. Use Value: Withstands 1500 W peak pulse power and dissipates >99% of surge current through low-impedance path, preserving upstream fuse integrity and downstream regulation. | Use Scenario: Adding secondary-level surge immunity to USB 2.0 data lines (D+/D−) in smart home hubs where internal ESD protection is insufficient for system-level IEC 61000-4-5 testing. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS integrated into USB connector subcircuit to suppress common-mode transients without degrading signal integrity. Use Value: Delivers <1.0 μA leakage at 18 V and clamps to 25.2 V within nanoseconds, meeting USB IF eye diagram and jitter requirements under surge stress. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18CA | 600 W peak pulse power (10/1000 μs); same VWM/VC but lower IPPM (32.4 A); SMA package (smaller footprint, higher RθJA) | Limited to lower-energy threats; not AEC-Q101 qualified; unsuitable for automotive under-hood deployment | Select when cost or board space is critical and surge threat level is ≤600 W (e.g., consumer USB ports). |
| SMCJ18CA | 1500 W rating matches SM15T18CAHM3_A/I; identical VWM/VC; same SMC package; but standard commercial grade (not AEC-Q101 or halogen-free) | Acceptable for industrial controls but lacks automotive qualification and green material compliance required for Tier 1 OEMs | Choose if AEC-Q101 and halogen-free status are not mandated, and lifecycle management is less stringent. |
Compared with SMAJ18CA and SMCJ18CA, SM15T18CAHM3_A/I uniquely combines AEC-Q101 qualification, halogen-free construction, and full 1500 W surge handling in a standardized SMC outline - making it the only option qualified for safety-critical automotive sensor nodes requiring traceable green sourcing and extended temperature operation.
Availability
SM15T18CAHM3_A/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 across multi-year production cycles.
Supply support for SM15T18CAHM3_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 designs and manufactures discrete semiconductors including diodes, rectifiers, and TVS devices with emphasis on reliability, precision, and application-specific optimization.
The SM15T Series targets high-energy transient suppression in harsh environments, specifically engineered for automotive, industrial, and telecom systems where AEC-Q101 compliance, halogen-free materials, and 1500 W surge capacity are mandatory.
FAQ
What does the "CA" suffix indicate in SM15T18CAHM3_A/I?
The "CA" suffix denotes a bidirectional configuration, meaning SM15T18CAHM3_A/I provides symmetrical clamping for both positive and negative voltage transients. Unlike unidirectional "A" variants, it has no cathode marking and functions identically in either orientation - essential for protecting AC-coupled or floating signal paths without polarity concerns.
Is SM15T18CAHM3_A/I qualified for automotive applications?
Yes, SM15T18CAHM3_A/I carries the HM3 suffix, confirming it is halogen-free, RoHS-compliant, and AEC-Q101 qualified. This certification covers stress tests including temperature cycling, high-temperature reverse bias, and ESD - validating its suitability for under-hood and chassis-mounted automotive electronics per ISO/TS 16949 requirements.
What is the maximum clamping voltage of SM15T18CAHM3_A/I under surge conditions?
The maximum clamping voltage of SM15T18CAHM3_A/I is 25.2 V when subjected to a 10/1000 μs waveform at its rated peak pulse current of 59.5 A. This value is measured per Figure 1 in Vishay document 88380 and defines the upper voltage limit imposed on protected circuitry during worst-case transient events.
How does the SMC (DO-214AB) package of SM15T18CAHM3_A/I affect thermal performance?
The SMC package delivers 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. This enables SM15T18CAHM3_A/I to sustain 6.5 W continuous power dissipation at 50 °C ambient and maintain safe operation up to +150 °C junction temperature in convection-cooled environments.
Does SM15T18CAHM3_A/I require special handling or baking before reflow soldering?
No, SM15T18CAHM3_A/I is rated MSL Level 1 per J-STD-020, meaning it has unlimited floor life at ≤30 °C and ≤60% relative humidity. No baking or dry-pack handling is required prior to lead-free reflow, simplifying manufacturing logistics and eliminating moisture-related popcorning risks during assembly.
SM15T18CAHM3_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:
- -
- Bidirectional Channels:
- 1
- 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)
SM15T18CAHM3_A/I FAQ
1.How can I place an order for SM15T18CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T18CAHM3_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 SM15T18CAHM3_A/I reliable?
The price and inventory of SM15T18CAHM3_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 SM15T18CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SM15T18CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T18CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T18CAHM3_A/I?
SM15T18CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T18CAHM3_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 SM15T18CAHM3_A/I?
For technical support, including SM15T18CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T18CAHM3_A/I requirements.
6.How does Aetrix verify that SM15T18CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SM15T18CAHM3_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 SM15T18CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SM15T18CAHM3_A/I?
All SM15T18CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SM15T18CAHM3_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 SM15T18CAHM3_A/I part is unused and in its original packaging.
Return procedure for SM15T18CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T18CAHM3_A/I Tags
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DESD3V3E1BL-7B
Diodes Incorporated
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