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Vishay General Semiconductor - Diodes Division 1.5SMC18CAHM3_A/I
- Part No.:
- 1.5SMC18CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC18CAHM3_A/I.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,965
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Product details
Overview
1.5SMC18CAHM3_A/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in the 1.5SMC series, designed for clamping voltage transients on signal or power lines. It features a 1500 W peak pulse power rating (10/1000 μs), 18 V breakdown voltage (VBR min/max = 17.1–18.9 V at 1 mA), and clamps to ≤25.2 V at 59.5 A peak pulse current. It is used in automotive sensor interfaces and industrial I/O protection where bidirectional surge immunity is required.
For engineers reviewing the 1.5SMC18CAHM3_A/I datasheet, 1.5SMC18CAHM3_A/I pinout, 1.5SMC18CAHM3_A/I application, or 1.5SMC18CAHM3_A/I equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, SMC (DO-214AB) package dimensions, clamping behavior under transient stress, and direct alternatives with documented differences in breakdown tolerance and leakage.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, delivering identical clamping performance in forward and reverse directions. Its glass-passivated junction ensures stable breakdown characteristics and low incremental surge resistance, critical for repeatable transient suppression in automotive-grade systems.
The device meets JESD201 Class 2 whisker resistance and MSL Level 1 per J-STD-020 (peak reflow 260 °C), supporting high-reliability automated assembly. With a maximum junction temperature of +150 °C and thermal resistance RθJA = 75 °C/W, it sustains repetitive surge events when mounted on standard 8.0 mm × 8.0 mm copper pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 17.1 V / 18.9 V at IT = 1 mA - defines guaranteed conduction onset window for bidirectional clamping |
| VWM | 15.3 V - maximum continuous reverse stand-off voltage before leakage exceeds 1 μA |
| VC @ IPPM | 25.2 V at 59.5 A - clamped voltage during 10/1000 μs surge, limiting downstream IC stress |
| PPPM | 1500 W - peak pulse power handling capability under standardized lightning/surge waveform |
| IPPM | 59.5 A - maximum non-repetitive surge current the device safely clamps without failure |
| TJ max | +150 °C - enables operation in under-hood automotive environments and industrial enclosures |
| AEC-Q101 | Qualified - certified for automotive electronic systems per stress test requirements |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, halogen-free, RoHS-compliant, matte tin-plated terminals. Dimensions: 7.75 mm × 6.22 mm × 2.62 mm (L × W × H); cathode band not marked (bidirectional).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Terminal A | One end of symmetrical PN junction - functions as cathode in negative half-cycle, anode in positive half-cycle |
| Cathode | Terminal B | Other end of symmetrical PN junction - functions identically to Anode due to bidirectional construction |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR, VC, and IPPM in both directions - eliminates polarity concerns in AC-coupled or floating signal paths |
| 1500 W peak pulse power | Handles IEC 61000-4-5 Level 4 surges (4 kV line-earth) without degradation when properly mounted |
| AEC-Q101 qualification | Validated for automotive applications including engine control modules and ADAS sensor interfaces |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (<1 ns rise time), improving protection margin |
| MSL Level 1 rating | Enables single-pass reflow without moisture-induced popcorn failure - no baking required pre-assembly |
Applications
| Automotive Sensor Interface | Industrial PLC Analog Input |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and temperature/pressure sensors from load dump and ESD in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across differential signal pair or supply rail to shunt transients before they reach sensitive analog front-ends. Use Value: Clamps 1500 W surges to ≤25.2 V while maintaining <1 μA leakage at 15.3 V, preserving signal integrity and ADC reference stability. |
Use Scenario: Safeguarding 4–20 mA current loop inputs in programmable logic controllers against field wiring surges and ground potential shifts. IC Role / Device Role / Timing Role: Parallel-connected TVS absorbing induced lightning energy on twisted-pair field wiring before it couples into op-amp input stages. Use Value: Withstands 59.5 A peak pulses without parametric shift, ensuring long-term calibration stability in harsh factory environments. |
| Telecom Line Card Protection | Consumer USB Port ESD |
Use Scenario: Secondary protection on Ethernet PHY interface lines (e.g., MDI-X) subjected to induced surges from nearby AC mains or PoE switching noise. IC Role / Device Role / Timing Role: Fast-response clamping element placed after primary gas discharge tube (GDT), limiting let-through voltage to PHY ICs. Use Value: 25.2 V clamping at 59.5 A ensures Ethernet magnetics and PHY transceivers remain within absolute maximum ratings during combined EFT/surge events. |
Use Scenario: ESD and surge protection for USB 2.0 data lines (D+/D−) in portable media players and docking stations exposed to human-body-model discharges. IC Role / Device Role / Timing Role: Low-capacitance bidirectional suppressor placed directly at connector to divert >8 kV HBM transients before reaching USB transceiver. Use Value: Symmetric response prevents signal distortion on differential pairs; 17.1–18.9 V VBR avoids false triggering during normal 3.3 V signaling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18CA | Same VBR range (17.1–18.9 V), lower PPPM = 600 W, SMB package (smaller footprint, higher RθJA) | Lower surge energy handling; suitable only for IEC 61000-4-2 ESD, not full lightning-level transients | Select when board space is constrained and surge threat level is limited to ±8 kV contact ESD. |
| 1.5KE18CA | Same VBR and PPPM, but through-hole DO-201 package - larger size, higher thermal mass, slower assembly | Not compatible with automated SMT lines; requires wave solder or hand assembly | Choose only for legacy designs or prototyping where reworkability outweighs production efficiency. |
Compared with SMBJ18CA and 1.5KE18CA, the 1.5SMC18CAHM3_A/I uniquely combines AEC-Q101 qualification, SMC surface-mount compatibility, and full 1500 W surge capability - making it the preferred choice for volume automotive and industrial SMT production where reliability, assembly yield, and transient robustness are jointly critical.
Availability
1.5SMC18CAHM3_A/I is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC analog inputs, telecom line cards, and consumer USB port protection requiring stable component supply, AEC-Q101 compliance, and consistent 1500 W surge performance.
Supply support for 1.5SMC18CAHM3_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 high-reliability diodes, MOSFETs, optoelectronics, and passive components for automotive, industrial, and computing markets.
The 1.5SMC Series was engineered specifically for surface-mount transient suppression in space-constrained, high-surge environments - emphasizing AEC-Q101 qualification, low-profile packaging, and repeatable clamping performance across temperature and life cycles.
FAQ
What does the "HM3" suffix indicate in 1.5SMC18CAHM3_A/I?
The "HM3" suffix in 1.5SMC18CAHM3_A/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. The "H" indicates 7-inch tape-and-reel packaging (850 units per reel), and "I" specifies 13-inch tape-and-reel (3500 units per reel). This distinguishes it from commercial-grade "M3" or automotive "HE3" variants, confirming its suitability for automotive production environments where material compliance and reliability validation are mandatory. The 1.5SMC18CAHM3_A/I meets JESD201 Class 2 whisker resistance and MSL Level 1 reflow standards.
Is 1.5SMC18CAHM3_A/I unidirectional or bidirectional?
1.5SMC18CAHM3_A/I is a bidirectional Transient Voltage Suppressor, as confirmed by the "CA" suffix in its part number. It provides symmetrical clamping behavior in both polarities - identical breakdown voltage (17.1–18.9 V), clamping voltage (≤25.2 V), and peak pulse current (59.5 A) regardless of voltage polarity. This eliminates orientation concerns during PCB layout and makes it ideal for protecting AC-coupled signals, differential buses like CAN or RS-485, and floating power rails where polarity reversal may occur.
What is the maximum clamping voltage of 1.5SMC18CAHM3_A/I under surge conditions?
The maximum clamping voltage (VC) of 1.5SMC18CAHM3_A/I is 25.2 V, measured at its rated peak pulse current (IPPM) of 59.5 A using the standardized 10/1000 μs double-exponential surge waveform. This value is guaranteed per Vishay's datasheet (Document Number 88303, Rev. 09-Mar-2026) and represents the upper limit of voltage imposed on protected circuitry during worst-case transient events. Engineers use this parameter to verify that downstream ICs remain within their absolute maximum voltage ratings during surge exposure.
Does 1.5SMC18CAHM3_A/I require a heatsink for standard operation?
No, 1.5SMC18CAHM3_A/I does not require an external heatsink for standard transient suppression operation. Its thermal design relies on PCB copper pad thermal conduction: when mounted on minimum recommended 8.0 mm × 8.0 mm copper pads per terminal, it achieves RθJA = 75 °C/W and safely dissipates its 6.5 W steady-state power rating at TA = 50 °C. Heatsinking is unnecessary because TVS devices operate intermittently - conducting only during transient events lasting microseconds - and its junction-to-lead thermal resistance (RθJL = 15 °C/W) efficiently transfers short-duration surge energy into the PCB.
How does the AEC-Q101 qualification of 1.5SMC18CAHM3_A/I impact its use in automotive designs?
The AEC-Q101 qualification of 1.5SMC18CAHM3_A/I certifies that it has passed accelerated stress tests including high-temperature operating life, temperature cycling, humidity bias HAST, and mechanical shock - all specific to discrete semiconductor reliability in automotive under-hood and cabin environments. This means the 1.5SMC18CAHM3_A/I is approved for use in safety-critical and mission-critical automotive subsystems such as engine control units, ADAS camera modules, and battery management interfaces, where failure could compromise functional safety. It is not merely "suitable for automotive"; it is formally qualified per industry-standard requirements.
1.5SMC18CAHM3_A/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- 1.5SMC, 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
1.5SMC18CAHM3_A/I FAQ
1.How can I place an order for 1.5SMC18CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC18CAHM3_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 1.5SMC18CAHM3_A/I reliable?
The price and inventory of 1.5SMC18CAHM3_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 1.5SMC18CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for 1.5SMC18CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC18CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC18CAHM3_A/I?
1.5SMC18CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC18CAHM3_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 1.5SMC18CAHM3_A/I?
For technical support, including 1.5SMC18CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC18CAHM3_A/I requirements.
6.How does Aetrix verify that 1.5SMC18CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All 1.5SMC18CAHM3_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 1.5SMC18CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of 1.5SMC18CAHM3_A/I?
All 1.5SMC18CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC18CAHM3_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 1.5SMC18CAHM3_A/I part is unused and in its original packaging.
Return procedure for 1.5SMC18CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC18CAHM3_A/I Tags
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ESD9B5.0ST5G
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DESD3V3E1BL-7B
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Diodes Incorporated
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