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Vishay General Semiconductor - Diodes Division 1.5SMC18CAHM3/I
- Part No.:
- 1.5SMC18CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC18CAHM3/I.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,813
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Product details
Overview
1.5SMC18CAHM3/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in the SMC (DO-214AB) package, designed for high-energy surge protection. It features a 1500 W peak pulse power rating (10/1000 µs), 18 V breakdown voltage (VBR = 17.1–18.9 V at IT = 1.0 mA), and clamps transients to ≤25.2 V at 59.5 A peak pulse current - used to protect automotive sensor signal lines, industrial I/O ports, and telecom interface circuits.
For engineers reviewing the 1.5SMC18CAHM3/I datasheet, 1.5SMC18CAHM3/I pinout, 1.5SMC18CAHM3/I application, or 1.5SMC18CAHM3/I equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (RθJA = 75 °C/W), clamping behavior under surge, and halogen-free RoHS-compliant construction per JESD201 Class 2 whisker test.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical VBR, VWM, and clamping characteristics in forward and reverse directions. Its glass-passivated junction enables fast response (<1 ns) and low incremental surge resistance, critical for suppressing ESD and lightning-induced transients on differential or AC-coupled lines.
The device is rated for repetitive 10/1000 µs surges at 0.01% duty cycle and derates linearly above TA = 25 °C per Fig. 2. It meets MSL Level 1 (J-STD-020) with 260 °C reflow peak and is qualified to AEC-Q101 for automotive use - confirmed by HM3 suffix and ordering code structure in Vishay's documentation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 17.1 V / 18.9 V at IT = 1.0 mA - defines reliable conduction onset for bidirectional overvoltage events |
| VWM | 15.3 V - maximum continuous reverse working voltage before leakage exceeds 1.0 µA |
| VC @ IPPM | 25.2 V at 59.5 A - clamping voltage during full 1500 W transient, limiting stress on downstream ICs |
| PPPM | 1500 W (10/1000 µs waveform) - energy-handling capacity sufficient for IEC 61000-4-5 Level 4 surges |
| RθJA | 75 °C/W - thermal resistance from junction to ambient, requiring ≥8.0 mm × 8.0 mm copper pads for rated power dissipation |
| TJmax | +150 °C - maximum junction temperature enabling operation in under-hood automotive environments |
| Construction | Halogen-free, RoHS-compliant, matte tin-plated leads - meets J-STD-002 solderability and JESD22-B102 reliability standards |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, low-profile case with molded UL 94 V-0 compound. Cathode band absent - bidirectional symmetry eliminates polarity marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Terminal 1 (cathode-band side not applicable) | One side of symmetrical PN junction - connects to either line of protected differential pair or AC signal path |
| Anode | Terminal 2 (opposite end) | Second terminal of bidirectional structure - forms complete clamping path across both polarities without orientation dependency |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR, VC, and IPPM in both directions - eliminates need for polarity-aware layout on AC or differential lines |
| AEC-Q101 qualification | Validated for automotive applications including engine control modules and ADAS sensor interfaces - confirmed by HM3 suffix and Vishay's ordering matrix |
| 1500 W surge rating | Withstands IEC 61000-4-5 combination wave (1.2/50 µs voltage, 8/20 µs current) up to Level 4 without degradation |
| Low Rsurge | Minimizes voltage overshoot during fast-rising transients - critical for protecting 3.3 V and 5 V logic interfaces |
| MSL Level 1 | Compatible with standard SMT reflow profiles up to 260 °C peak - no moisture sensitivity handling required |
Applications
| Automotive Sensor Protection | Industrial RS-485 Interface |
|---|---|
|
Use Scenario: Protecting CAN/LIN bus sensors from load dump and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional TVS placed across differential signal pair (e.g., CAN_H/CAN_L) to clamp ±25 V transients. Use Value: Clamps to ≤25.2 V while absorbing 1500 W surges - prevents latch-up or gate oxide damage in transceivers like SN65HVD230. |
Use Scenario: Shielding RS-485 transceivers in factory automation PLCs from ground loop surges and EFT bursts. IC Role / Device Role / Timing Role: Placed across A/B lines to suppress common-mode transients up to ±1 kV (IEC 61000-4-4/5). Use Value: Fast <1 ns response and symmetrical clamping ensure signal integrity remains intact during 8/20 µs surges on long cable runs. |
| Telecom Line Interface | Consumer USB Port ESD |
|
Use Scenario: Safeguarding Ethernet PHYs and DSL line drivers against lightning-induced surges on outdoor-facing ports. IC Role / Device Role / Timing Role: Used as primary protection stage before GDT or polymer PTC, across tip/ring or data pairs. Use Value: 15.3 V VWM allows compatibility with 12 V bias rails; 25.2 V VC ensures safe margin below 28 V PHY absolute max ratings. |
Use Scenario: Adding secondary-level surge immunity to USB 2.0 data lines in set-top boxes and smart displays. IC Role / Device Role / Timing Role: Bidirectional placement across D+/D− to handle ±8 kV contact ESD (IEC 61000-4-2) and cable discharge events. Use Value: Low capacitance (typ. <100 pF at 0 V) avoids signal rise-time degradation; halogen-free construction meets consumer RoHS requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18CA | Same VBR range (17.1–18.9 V), but lower PPPM = 600 W in SMB (DO-214AA) package | Limited to lower-energy surges (IEC 61000-4-5 Level 2); unsuitable for automotive load dump | Select when board space is constrained and surge threat level is moderate (e.g., internal PCB traces only) |
| 1.5KE18CA | Through-hole TO-204AE (DO-15) package, same 1500 W rating and VBR, but higher RθJA ≈ 100 °C/W | Requires manual assembly; less suitable for automated SMT lines and high-density layouts | Choose for legacy through-hole designs or where thermal mass of lead-frame improves sustained surge handling |
Compared with SMBJ18CA and 1.5KE18CA, the 1.5SMC18CAHM3/I delivers automotive-grade reliability in an SMT-optimized package with superior thermal performance (RθJA = 75 °C/W) and halogen-free compliance - making it the preferred choice for new AEC-Q101-compliant designs requiring automated assembly and high surge immunity.
Availability
1.5SMC18CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor protection, industrial RS-485 interface hardening, and telecom line surge suppression requiring stable component supply, AEC-Q101 traceability, and halogen-free compliance.
Supply support for 1.5SMC18CAHM3/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, and passive components for automotive, industrial, and computing markets.
The 1.5SMC Series was engineered specifically for robust, surface-mount transient suppression in harsh environments - emphasizing AEC-Q101 qualification, high pulse power density, and automated assembly compatibility.
FAQ
What does the "HM3" suffix indicate in 1.5SMC18CAHM3/I?
The "HM3" suffix in 1.5SMC18CAHM3/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification - confirmed in Vishay's ordering information table and mechanical data section. It also specifies JESD201 Class 2 whisker resistance and MSL Level 1 moisture sensitivity rating, distinguishing it from commercial-grade M3 or E3 variants.
Is 1.5SMC18CAHM3/I unidirectional or bidirectional?
The "CA" in 1.5SMC18CAHM3/I explicitly identifies it as a bidirectional Transient Voltage Suppressor. As stated in Vishay's documentation, CA-suffix devices exhibit identical electrical characteristics in both directions - including matched VBR, VWM, and VC - and carry no polarity marking on the SMC package.
What is the maximum clamping voltage of 1.5SMC18CAHM3/I under surge conditions?
The maximum clamping voltage (VC) of 1.5SMC18CAHM3/I is 25.2 V at 59.5 A peak pulse current (IPPM), measured with a 10/1000 µs waveform. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during worst-case transients.
Does 1.5SMC18CAHM3/I meet automotive qualification standards?
Yes, 1.5SMC18CAHM3/I is AEC-Q101 qualified, as confirmed by its HM3 suffix and explicit listing in Vishay's AEC-Q101-capable ordering codes. It is rated for operation from −65 °C to +150 °C and validated for reliability under automotive stress conditions including temperature cycling, humidity, and mechanical shock.
What is the thermal resistance of 1.5SMC18CAHM3/I, and how does it affect layout?
The junction-to-ambient thermal resistance (RθJA) of 1.5SMC18CAHM3/I is 75 °C/W, measured on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. To maintain rated power dissipation, PCB layout must provide at least this pad area - undersized pads will cause excessive junction temperature rise and premature failure during repetitive surges.
1.5SMC18CAHM3/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:
- Discontinued at Digi-Key
- 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/I FAQ
1.How can I place an order for 1.5SMC18CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC18CAHM3/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/I reliable?
The price and inventory of 1.5SMC18CAHM3/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/I is usually 5 days.
3.What payment methods are accepted for 1.5SMC18CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC18CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC18CAHM3/I?
1.5SMC18CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC18CAHM3/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/I?
For technical support, including 1.5SMC18CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC18CAHM3/I requirements.
6.How does Aetrix verify that 1.5SMC18CAHM3/I is sourced from the original manufacturer or authorized distributors?
All 1.5SMC18CAHM3/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/I meets industry standards.
7.What is the process for return or replacement of 1.5SMC18CAHM3/I?
All 1.5SMC18CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC18CAHM3/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/I part is unused and in its original packaging.
Return procedure for 1.5SMC18CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC18CAHM3/I Tags
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ESD9B5.0ST5G
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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