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Vishay General Semiconductor - Diodes Division SM15T18CAHM3_A/H
- Part No.:
- SM15T18CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T18CAHM3_A/H.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:1,550
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Product details
Overview
SM15T18CAHM3_A/H 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 clamping voltage of 25.2 V at 59.5 A peak pulse current. It protects signal lines and power rails in automotive sensor units and industrial I/O interfaces against lightning-induced and inductive-switching transients.
For engineers reviewing the SM15T18CAHM3_A/H datasheet, SM15T18CAHM3_A/H pinout, SM15T18CAHM3_A/H application, or SM15T18CAHM3_A/H equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification status, 1500 W surge capability, thermal resistance (RθJA = 75 °C/W), and halogen-free RoHS compliance per HM3 suffix.
Technical Context
This device operates as a voltage-clamped crowbar during transient overvoltage events, 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.
The SM15T18CAHM3_A/H is designed for surface-mount placement on PCBs with minimum 8.0 mm × 8.0 mm copper pads per terminal, leveraging low-inductance layout to preserve clamping response under fast-rising transients (e.g., 8/20 μs waveform). Failure mode under overstress is short-circuit, consistent with IEC 61000-4-5 compliance requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working range for 24 V nominal systems. |
| VBR min/max | 17.1 V / 18.9 V at 1.0 mA - Tight 10% breakdown tolerance ensures predictable turn-on across temperature and production lots. |
| VC @ IPPM | 25.2 V at 59.5 A (10/1000 μs) - Clamping voltage limits downstream IC stress to <25.2 V during worst-case surge events. |
| PPPM | 1500 W - Peak pulse power rating supports protection against IEC 61000-4-5 Level 4 (4 kV) surges on industrial and automotive lines. |
| TJ max | +150 °C - Enables operation in under-hood automotive environments and high-ambient industrial enclosures. |
| RθJA | 75 °C/W - Thermal resistance requires adequate copper area (8 mm × 8 mm pads) to maintain junction temperature within limit at 6.5 W steady-state dissipation. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, halogen-free, RoHS-compliant, MSL Level 1 (260 °C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked end) | Not applicable - bidirectional device | No polarity marking; terminals are functionally identical; either lead may connect to line or ground side of protected circuit. |
| Anode (unmarked end) | Not applicable - bidirectional device | Same as cathode; symmetric conduction enables protection of AC-coupled or floating signal paths without orientation constraints. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of differential or AC signal lines (e.g., CAN FD, RS-485) without polarity concerns. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive-grade reliability including temperature cycling, HTRB, and mechanical shock per JESD22 standards. |
| 1500 W peak pulse power | Supports full IEC 61000-4-5 surge immunity up to 4 kV (line-to-ground) in properly designed PCB layouts. |
| Low clamping ratio (VC/VWM = 1.4) | Minimizes overvoltage stress on protected ICs compared to higher-ratio TVS devices, improving system-level robustness. |
Applications
| Automotive Sensor Protection | Industrial I/O Line Protection |
|---|---|
Use Scenario: Protecting LIN bus and analog sensor outputs (e.g., pressure, temperature) in engine control modules from load-dump and inductive kickback. IC Role / Device Role / Timing Role: Voltage-clamping transient suppressor placed directly at connector entry point before signal conditioning circuitry. Use Value: Limits transient excursions to ≤25.2 V, preventing latch-up or gate oxide damage in 3.3 V/5 V microcontrollers and ADC front-ends. | Use Scenario: Shielding PLC digital input channels connected to 24 V DC field wiring exposed to relay coil switching noise and lightning coupling. IC Role / Device Role / Timing Role: Primary surge suppression element mounted adjacent to terminal block, shunting energy before it reaches optocoupler or Schmitt trigger inputs. Use Value: Withstands 59.5 A peak pulses without degradation, maintaining signal integrity during factory automation equipment commissioning and maintenance. |
| Telecom Interface Protection | Consumer Power Adapter Input |
Use Scenario: Safeguarding Ethernet PHY interface power pins (e.g., PoE midspan injectors) against ESD and surge events on unshielded twisted-pair cabling. IC Role / Device Role / Timing Role: Bidirectional TVS placed between VDD and GND on PHY power rail, providing common-mode and differential-mode transient suppression. Use Value: Symmetric clamping ensures equal protection regardless of surge polarity, critical for full-duplex data links where polarity reversal occurs during cable faults. | Use Scenario: Input-stage surge protection for USB-C PD adapters handling 20 V input, exposed to mains-borne transients via AC-DC front-end. IC Role / Device Role / Timing Role: Secondary-level TVS after MOV and fuse, absorbing residual energy that passes through primary protection stages. Use Value: 18 V VWM allows compatibility with 20 V input rails while clamping below 25.2 V, preserving downstream controller ICs rated for 28 V absolute maximum. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18CA | 600 W peak pulse power (10/1000 μs); SMA package (smaller footprint, higher RθJA = 110 °C/W) | Lower surge capacity; suitable only for Level 2–3 IEC 61000-4-5 (1–2 kV), not automotive under-hood use | Select when board space is constrained and surge threat level is moderate (e.g., consumer USB ports). |
| SMCJ18CA | 1500 W rating same as SM15T18CAHM3_A/H; identical SMC package; but standard M3 suffix (non-AEC-Q101) | Lacks automotive qualification; not approved for safety-critical vehicle subsystems requiring AEC-Q101 traceability | Select for industrial control panels where AEC-Q101 is not mandated but same electrical performance is required. |
Compared with SMAJ18CA and SMCJ18CA, the SM15T18CAHM3_A/H delivers identical 1500 W surge capability and SMC packaging while adding halogen-free construction and formal AEC-Q101 qualification-making it the only choice for Tier 1 automotive sensor modules requiring full PPAP documentation and long-term supply assurance.
Availability
SM15T18CAHM3_A/H is available at Aetrix Electronics and suitable for automotive sensor units, industrial PLC I/O modules, and telecom interface protection requiring stable component supply, AEC-Q101 compliance, and halogen-free RoHS adherence.
Supply support for SM15T18CAHM3_A/H 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 engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where failure modes must be controlled and surge immunity must meet IEC/ISO standards.
FAQ
What does the "HM3" suffix indicate in SM15T18CAHM3_A/H?
The "HM3" suffix in SM15T18CAHM3_A/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It confirms compliance with automotive reliability testing (including temperature cycling, HTRB, and mechanical shock), traceable lot control, and material restrictions per JEDEC J-STD-020 and JESD201 Class 2 whisker testing. This distinguishes it from commercial-grade variants like SM15T18CA-M3.
Is SM15T18CAHM3_A/H suitable for protecting CAN FD bus lines?
Yes, SM15T18CAHM3_A/H is suitable for CAN FD bus protection due to its bidirectional clamping, 18 V VWM (compatible with 12 V nominal bus voltage), and low clamping voltage of 25.2 V. Its symmetric response preserves signal integrity on differential pairs, and AEC-Q101 qualification ensures suitability for automotive CAN FD nodes in powertrain and chassis domains.
What is the maximum clamping voltage of SM15T18CAHM3_A/H under an 8/20 μs surge waveform?
The maximum clamping voltage of SM15T18CAHM3_A/H under an 8/20 μs surge waveform is 32.5 V at 308 A peak pulse current, as specified in the Vishay SM15T datasheet (Document Number: 88380, page 2). This value reflects real-world surge conditions more severe than the standard 10/1000 μs test, confirming robust protection for lightning-induced transients.
Does SM15T18CAHM3_A/H require orientation during PCB placement?
No, SM15T18CAHM3_A/H does not require specific orientation during PCB placement because it is a bidirectional TVS diode. Unlike unidirectional types, it has no cathode marking and functions identically regardless of lead direction-enabling simplified automated assembly and eliminating risk of reverse installation on differential or AC-coupled signal paths.
How does the thermal resistance of SM15T18CAHM3_A/H affect PCB layout?
The SM15T18CAHM3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W, which requires mounting on minimum 8.0 mm × 8.0 mm copper pads per terminal to achieve rated power dissipation. Smaller pads increase thermal impedance, risking junction overheating during repetitive surges or elevated ambient temperatures-especially critical in sealed automotive enclosures above 85 °C.
SM15T18CAHM3_A/H 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/H FAQ
1.How can I place an order for SM15T18CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T18CAHM3_A/H 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/H reliable?
The price and inventory of SM15T18CAHM3_A/H 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/H is usually 5 days.
3.What payment methods are accepted for SM15T18CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T18CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T18CAHM3_A/H?
SM15T18CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T18CAHM3_A/H 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/H?
For technical support, including SM15T18CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T18CAHM3_A/H requirements.
6.How does Aetrix verify that SM15T18CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SM15T18CAHM3_A/H 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/H meets industry standards.
7.What is the process for return or replacement of SM15T18CAHM3_A/H?
All SM15T18CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SM15T18CAHM3_A/H, 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/H part is unused and in its original packaging.
Return procedure for SM15T18CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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