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Vishay General Semiconductor - Diodes Division 1.5SMC18CAHM3/H
- Part No.:
- 1.5SMC18CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC18CAHM3/H.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,034
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Product details
Overview
1.5SMC18CAHM3/H from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of sensitive electronics. 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 transients to ≤25.2 V at 59.5 A peak pulse current - deployed in automotive sensor signal lines, industrial I/O ports, and telecom interface protection.
For engineers reviewing the 1.5SMC18CAHM3/H datasheet, 1.5SMC18CAHM3/H pinout, 1.5SMC18CAHM3/H application, or 1.5SMC18CAHM3/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance, low incremental surge resistance, and compatibility with automated SMT assembly on standard PCB pad layouts.
Technical Context
This device operates as a voltage-clamped transient suppressor using an avalanche junction structure. Its bidirectional symmetry enables protection against both positive and negative polarity surges without polarity sensitivity, and its glass-passivated chip junction ensures stable breakdown characteristics across temperature and lifetime.
The 1.5SMC18CAHM3/H delivers 1500 W peak pulse power handling under standardized 10/1000 μs waveform conditions, with thermal resistance of 75 °C/W (junction-to-ambient) and 15 °C/W (junction-to-leads), enabling reliable operation up to 150 °C junction temperature in compact SMC footprint designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 17.1 V / 18.9 V at 1 mA test current - defines precise voltage threshold where avalanche conduction begins in both directions |
| VWM | 15.3 V - maximum continuous reverse working voltage before leakage exceeds 1 μA; sets safe operating margin below clamping |
| VC @ IPPM | 25.2 V at 59.5 A - clamping voltage during full 1500 W transient event; determines protected circuit's maximum stress level |
| PPPM | 1500 W - peak pulse power rating per 10/1000 μs waveform; defines surge energy absorption capacity without failure |
| IPPM | 59.5 A - peak pulse current corresponding to 1500 W at 25.2 V clamp; used for PCB trace sizing and layout derating |
| TJ max | +150 °C - maximum junction temperature; supports operation in under-hood automotive and high-ambient industrial environments |
| Package | SMC (DO-214AB) - industry-standard surface-mount outline with 8.0 mm × 8.0 mm copper pad requirement for thermal performance |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, bidirectional - no polarity marking; symmetrical terminal configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional transient path | Both terminals function identically; no cathode band marking - enables flexible PCB layout without orientation constraints |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for engine control, ADAS, and body electronics |
| Halogen-free & RoHS-compliant | Meets JEDEC J-STD-020 MSL Level 1 and JESD201 Class 2 whisker resistance - supports lead-free reflow and long-term solder joint integrity |
| 1500 W peak pulse power | Handles severe lightning-induced surges (IEC 61000-4-5 Level 4) and inductive switching spikes without degradation |
| Low clamping ratio (VC/VBR ≈ 1.41) | Minimizes overvoltage stress on downstream ICs - critical for protecting 3.3 V and 5 V logic interfaces |
| Glass-passivated junction | Ensures stable VBR tolerance and low leakage (<1 μA at VWM) over 15-year field life in harsh environments |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ESD events in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional TVS clamping element placed directly at connector entry point to shunt transients before reaching signal conditioning ICs. Use Value: Enables compliance with ISO 7637-2 Pulse 1/2a/5a and ISO 10605 ESD standards while maintaining signal integrity for sub-100 ns response. |
Use Scenario: Safeguarding 24 V digital input modules in programmable logic controllers against field-wiring induced surges and ground bounce. IC Role / Device Role / Timing Role: Primary overvoltage clamp on dry-contact and optocoupler input stages, operating in parallel with upstream fuses. Use Value: Withstands repetitive 1500 W transients at 0.01 % duty cycle - extends module service life in factory automation environments. |
| Telecom Interface Protection | Consumer Power Adapter EMI Filtering |
Use Scenario: Shielding Ethernet PHYs, RS-485 transceivers, and PoE injectors from lightning-induced common-mode surges on outdoor cabling. IC Role / Device Role / Timing Role: Secondary-level TVS in conjunction with GDTs and common-mode chokes - handles residual differential-mode energy after front-end filtering. Use Value: Clamps to 25.2 V within nanoseconds, preventing latch-up in 3.3 V PHY ICs while supporting >100 kV/μs slew rate immunity. |
Use Scenario: Suppressing fast-rising switching noise and line transients on secondary-side DC outputs of AC/DC adapters for USB-C PD and smart home devices. IC Role / Device Role / Timing Role: Final-stage transient suppressor across +5 V / +9 V / +12 V rails, placed adjacent to connector pins to minimize loop inductance. Use Value: Halogen-free construction meets IEC 62368-1 flammability (UL 94 V-0) and environmental compliance for global consumer certifications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18CA | Same VBR range (17.1–18.9 V), but lower PPPM = 600 W in smaller SMB (DO-214AA) package | Limited to lower-energy transients (e.g., ESD-only); unsuitable for IEC 61000-4-5 Level 3+ surge testing | Select when board space is constrained and surge threat level is limited to ±8 kV contact ESD (IEC 61000-4-2). |
| 1.5KE18CA | Through-hole TO-218 package; identical electrical specs but higher RθJA (≈100 °C/W) and no AEC-Q101 qualification | Not suitable for automotive or high-reliability SMT production; requires wave-solder or hand-solder process | Choose only for legacy through-hole designs or prototyping where reflow compatibility and automotive qualification are not required. |
Compared with SMBJ18CA and 1.5KE18CA, the 1.5SMC18CAHM3/H uniquely combines 1500 W surge capability, AEC-Q101 qualification, halogen-free compliance, and SMC footprint - making it the preferred choice for volume automotive and industrial SMT production requiring full IEC 61000-4-5 compliance.
Availability
1.5SMC18CAHM3/H is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, and telecom interface boards requiring stable component supply, long-lifecycle support, and certified AEC-Q101 reliability.
Supply support for 1.5SMC18CAHM3/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 high-reliability diodes, MOSFETs, and passive components for automotive, industrial, and computing markets.
The 1.5SMC Series was engineered specifically for high-power, surface-mount transient suppression in space-constrained, high-reliability systems - emphasizing AEC-Q101 qualification, robust surge handling, and automated assembly compatibility.
FAQ
What is the clamping voltage of the 1.5SMC18CAHM3/H under maximum rated surge current?
The 1.5SMC18CAHM3/H clamps to a maximum of 25.2 V when subjected to its rated peak pulse current of 59.5 A (10/1000 μs waveform). This value is measured per standard test conditions defined in the Vishay datasheet (Document Number: 88303), and reflects the actual voltage seen by protected circuitry during worst-case transient events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is the 1.5SMC18CAHM3/H suitable for automotive applications?
Yes, the 1.5SMC18CAHM3/H is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant, and automotive-grade construction. It has passed rigorous stress tests including temperature cycling, high-temperature reverse bias (HTRB), and ESD - making it approved for use in engine control units, ADAS sensors, and body electronics where reliability under extreme thermal and electrical stress is mandatory.
Does the 1.5SMC18CAHM3/H have polarity markings on the package?
No, the 1.5SMC18CAHM3/H is a bidirectional TVS diode in SMC (DO-214AB) package and carries no cathode band or polarity marking. Its symmetrical internal structure allows either terminal to serve as anode or cathode depending on transient polarity - simplifying PCB layout and eliminating orientation errors during automated placement.
What is the maximum operating junction temperature for the 1.5SMC18CAHM3/H?
The 1.5SMC18CAHM3/H has a maximum junction temperature (TJ) of +150 °C, as specified in the Vishay 1.5SMC Series datasheet. This rating enables reliable operation in under-hood automotive environments and high-ambient industrial enclosures, provided the PCB uses the recommended 8.0 mm × 8.0 mm copper pad area per terminal to maintain thermal resistance within limits.
How does the 1.5SMC18CAHM3/H differ from unidirectional variants like 1.5SMC18AHM3/H?
The 1.5SMC18CAHM3/H is bidirectional (denoted by "CA"), providing symmetrical clamping for both positive and negative transients, whereas 1.5SMC18AHM3/H is unidirectional ("A") with a cathode band and only protects against reverse-polarity surges. The CA version is used where signal lines carry AC or bipolar signals (e.g., RS-485, CAN), while the "A" variant suits DC rail protection with defined polarity - selecting the wrong type risks incomplete protection.
1.5SMC18CAHM3/H 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/H FAQ
1.How can I place an order for 1.5SMC18CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC18CAHM3/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 1.5SMC18CAHM3/H reliable?
The price and inventory of 1.5SMC18CAHM3/H 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/H is usually 5 days.
3.What payment methods are accepted for 1.5SMC18CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC18CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC18CAHM3/H?
1.5SMC18CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC18CAHM3/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 1.5SMC18CAHM3/H?
For technical support, including 1.5SMC18CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC18CAHM3/H requirements.
6.How does Aetrix verify that 1.5SMC18CAHM3/H is sourced from the original manufacturer or authorized distributors?
All 1.5SMC18CAHM3/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 1.5SMC18CAHM3/H meets industry standards.
7.What is the process for return or replacement of 1.5SMC18CAHM3/H?
All 1.5SMC18CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC18CAHM3/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 1.5SMC18CAHM3/H part is unused and in its original packaging.
Return procedure for 1.5SMC18CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC18CAHM3/H Tags
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