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Vishay General Semiconductor - Diodes Division 1.5SMC18AHM3_A/I
- Part No.:
- 1.5SMC18AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC18AHM3_A/I.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,247
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Product details
Overview
1.5SMC18AHM3_A/I from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for clamping voltage transients on power and signal lines. It features 18 V breakdown voltage (VBR = 17.1–18.9 V at IT = 1.0 mA), 15.3 V stand-off voltage (VWM), 25.2 V maximum clamping voltage (VC) at 59.5 A peak pulse current, and 1500 W peak pulse power rating with 10/1000 µs waveform - used in automotive sensor protection and industrial power rail surge suppression.
For engineers reviewing the 1.5SMC18AHM3_A/I datasheet, 1.5SMC18AHM3_A/I pinout, 1.5SMC18AHM3_A/I application, or 1.5SMC18AHM3_A/I equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification (HM3 suffix), halogen-free RoHS compliance, low incremental surge resistance, and MSL Level 1 moisture sensitivity for reflow compatibility.
Technical Context
This TVS diode operates as a clamping device that enters avalanche conduction when reverse voltage exceeds VBR, limiting transient energy to protect downstream ICs and MOSFETs. Its glass-passivated junction ensures stable breakdown characteristics and fast response time (<1 ns), while the SMC package supports automated placement and meets UL 94 V-0 flammability rating.
The 1.5SMC18AHM3_A/I is rated for 150 °C maximum junction temperature and derates linearly above 25 °C ambient per Fig. 2. With RθJA = 75 °C/W and RθJL = 15 °C/W, thermal performance depends on PCB copper pad area (0.31" × 0.31" recommended), and it sustains 200 A non-repetitive forward surge (8.3 ms half-sine) only in unidirectional configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 17.1 V / 18.9 V at 1.0 mA test current - defines precise avalanche onset range for reliable clamping threshold |
| VWM | 15.3 V - maximum continuous reverse operating voltage before leakage exceeds 1.0 µA |
| VC @ IPPM | 25.2 V at 59.5 A - clamped voltage during 10/1000 µs surge, determining protected circuit's maximum stress level |
| PPPM | 1500 W - peak transient power handling capability under standardized surge waveform |
| IFSM | 200 A - single half-sine surge current rating (8.3 ms), critical for inductive load switching events |
| TJ max | 150 °C - maximum junction temperature, defining thermal design margin for sustained operation |
| MSL Level | Level 1 (J-STD-020) - allows unlimited floor life and standard reflow without baking |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, molded plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102; polarity indicated by cathode band on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse voltage reference | Connected to lower-potential side of protected line; reverse-biased during transient clamping |
| Cathode | Avalanche conduction terminal | Marked with band; connected to higher-potential side (e.g., VCC rail or signal line); conducts surge current to ground |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan |
| Halogen-free & RoHS-compliant | Meets JEDEC J-STD-020 MSL Level 1 and environmental compliance for global automotive and industrial markets |
| Glass passivated junction | Ensures stable VBR tolerance and low leakage drift over lifetime and temperature extremes |
| 1500 W peak pulse power | Handles high-energy transients from lightning-induced surges or inductive kickback without degradation |
| Low clamping ratio (VC/VBR ≈ 1.42) | Minimizes overvoltage stress on protected ICs compared to competing TVS devices with higher ratios |
Applications
| Automotive Sensor Protection | Industrial Power Rail Clamping |
|---|---|
|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load-dump and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role / Timing Role: Unidirectional TVS placed between sensor signal line and ground, clamping transients within nanoseconds before IC input stages are damaged. Use Value: Enables robust operation at 12 V/24 V systems with VC = 25.2 V ensuring MCU I/O stays below absolute maximum ratings during 10/1000 µs surges up to 59.5 A. |
Use Scenario: Safeguarding 24 V DC power inputs in PLC modules and motor drives against inductive switching spikes and AC line coupling. IC Role / Device Role / Timing Role: Mounted across input rail and chassis ground to shunt surge energy away from DC-DC converters and microcontrollers. Use Value: 1500 W PPPM and 200 A IFSM allow survival of repeated 100 V/50 A transients common in factory automation environments. |
| Telecom Line Interface Protection | Consumer Device USB/Power Port |
|
Use Scenario: Shielding Ethernet PHY interfaces and PoE injectors from ESD and lightning-induced surges entering via RJ45 ports. IC Role / Device Role / Timing Role: Paired with common-mode chokes on differential pairs; clamps differential and common-mode overvoltages simultaneously. Use Value: Low capacitance (typ. <100 pF at 0 V) avoids signal integrity degradation on 100BASE-TX lines while providing 15.3 V VWM hold-off. |
Use Scenario: Adding secondary surge protection on 5 V USB VBUS and auxiliary power inputs in smart home hubs and portable chargers. IC Role / Device Role / Timing Role: Final-stage clamping device downstream of primary fuses and filters, absorbing residual energy missed by upstream protection. Use Value: SMC package footprint enables compact layout; MSL Level 1 supports lead-free reflow without preconditioning, reducing manufacturing complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18A-E3/57T | Same VWM (15.3 V) and VC (25.2 V), but lower PPPM = 400 W and SMA package (smaller thermal mass) | Not AEC-Q101 qualified; limited to commercial-grade consumer/industrial use | Select when cost or board space is prioritized over automotive reliability and 1500 W surge capacity |
| 1.5KE18A | Through-hole DO-201 package; identical electrical specs but no AEC-Q101 or halogen-free certification | Requires wave soldering or hand assembly; unsuitable for high-volume SMT lines | Choose only for legacy through-hole designs or prototyping where reflow compatibility is not required |
Compared with SMAJ18A-E3/57T and 1.5KE18A, the 1.5SMC18AHM3_A/I delivers automotive-grade reliability, halogen-free compliance, and superior 1500 W surge handling in an SMT-optimized SMC package - making it the preferred choice for production-grade automotive and industrial electronics requiring long-term supply continuity and regulatory alignment.
Availability
1.5SMC18AHM3_A/I is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC power supplies, and telecom interface protection requiring stable component supply, AEC-Q101 validation, and halogen-free compliance.
Supply support for 1.5SMC18AHM3_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 diodes, rectifiers, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific performance.
The 1.5SMC Series was developed for high-power, surface-mount transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where robustness, AEC-Q101 qualification, and consistent clamping behavior are mandatory.
FAQ
What is the meaning of the 'HM3_A/I' suffix in 1.5SMC18AHM3_A/I?
The 'HM3' suffix indicates halogen-free, RoHS-compliant, and AEC-Q101 qualified construction; '_A' denotes the revision code; '/I' specifies packaging in 13-inch tape-and-reel format with 3500 units per reel. This full ordering code ensures traceability to Vishay's automotive-grade production lot and compliance documentation for 1.5SMC18AHM3_A/I.
Is 1.5SMC18AHM3_A/I suitable for bidirectional transient protection?
No - 1.5SMC18AHM3_A/I is strictly unidirectional, as confirmed by its part number ending in 'A' (not 'CA') and polarity marking (cathode band). For bidirectional protection at similar voltage levels, Vishay offers 1.5SMC18CA variants; using 1.5SMC18AHM3_A/I in bidirectional circuits risks failure due to forward conduction during negative transients.
What is the maximum clamping voltage of 1.5SMC18AHM3_A/I under surge conditions?
The maximum clamping voltage (VC) of 1.5SMC18AHM3_A/I is 25.2 V at 59.5 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured per Figure 1 in the datasheet and defines the upper voltage limit imposed on protected circuitry during worst-case transient events.
Does 1.5SMC18AHM3_A/I require PCB layout derating for thermal performance?
Yes - the specified RθJA = 75 °C/W assumes mounting on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. Reducing pad size or omitting thermal vias increases junction temperature; for continuous 6.5 W dissipation, thermal simulation or empirical testing is required to validate safe operation of 1.5SMC18AHM3_A/I in the target layout.
How does the AEC-Q101 qualification impact the use of 1.5SMC18AHM3_A/I in industrial applications?
AEC-Q101 qualification certifies 1.5SMC18AHM3_A/I for extended temperature cycling, high-temperature reverse bias, and mechanical shock - exceeding typical industrial requirements. While not mandatory outside automotive, this qualification provides proven field reliability, longer lifetime prediction, and reduced risk of early-life failure in demanding industrial deployments of 1.5SMC18AHM3_A/I.
1.5SMC18AHM3_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:
- 1
- Bidirectional Channels:
- -
- 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)
1.5SMC18AHM3_A/I FAQ
1.How can I place an order for 1.5SMC18AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC18AHM3_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 1.5SMC18AHM3_A/I reliable?
The price and inventory of 1.5SMC18AHM3_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 1.5SMC18AHM3_A/I is usually 5 days.
3.What payment methods are accepted for 1.5SMC18AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC18AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC18AHM3_A/I?
1.5SMC18AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC18AHM3_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 1.5SMC18AHM3_A/I?
For technical support, including 1.5SMC18AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC18AHM3_A/I requirements.
6.How does Aetrix verify that 1.5SMC18AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All 1.5SMC18AHM3_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 1.5SMC18AHM3_A/I meets industry standards.
7.What is the process for return or replacement of 1.5SMC18AHM3_A/I?
All 1.5SMC18AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC18AHM3_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 1.5SMC18AHM3_A/I part is unused and in its original packaging.
Return procedure for 1.5SMC18AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC18AHM3_A/I Tags
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