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Vishay General Semiconductor - Diodes Division 1.5SMC18A-M3/9AT
- Part No.:
- 1.5SMC18A-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC18A-M3/9AT.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:5,315
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Product details
Overview
1.5SMC18A-M3/9AT from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection in power and signal lines. It features a 1500 W peak pulse power rating (10/1000 µs), 18 V breakdown voltage (VBR = 17.1–18.9 V at 1 mA), and clamps to ≤25.2 V at 59.5 A peak pulse current - deployed in automotive ECUs, industrial I/O modules, and DC power rails.
For engineers reviewing the 1.5SMC18A-M3/9AT datasheet, 1.5SMC18A-M3/9AT pinout, 1.5SMC18A-M3/9AT application, or 1.5SMC18A-M3/9AT equivalent, key selection criteria include its unidirectional polarity, SMC (DO-214AB) package, 15.3 V stand-off voltage (VWM), <1 µA reverse leakage at VWM, and AEC-Q101 qualification eligibility via M3 suffix - critical for automotive-grade surge resilience.
Technical Context
This TVS diode operates as a clamping device that enters avalanche breakdown when transient voltage exceeds its VBR threshold, diverting surge current away from protected circuitry. Its glass-passivated junction ensures stable breakdown characteristics and low incremental surge resistance (<0.4 Ω typical), enabling fast response (<1.0 ns) to ESD and lightning-induced transients.
The 1.5SMC18A-M3/9AT is rated for 200 A non-repetitive forward surge current (8.3 ms half-sine), supports continuous power dissipation of 6.5 W on infinite heatsink at 50 °C, and maintains operation across -65 °C to +150 °C junction temperature range - validated under J-STD-020 MSL Level 1 with 260 °C reflow peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 17.1 V / 18.9 V at 1 mA - defines precise avalanche onset for reliable clamping initiation |
| VWM | 15.3 V - maximum continuous reverse operating voltage before leakage rises significantly |
| IPPM | 59.5 A (10/1000 µs) - peak surge current it safely shunts without failure |
| VC | ≤25.2 V at IPPM - clamped voltage seen by protected IC or MOSFET during worst-case surge |
| PPPM | 1500 W - peak transient power handling capability per industry-standard waveform |
| ID @ VWM | ≤1.0 µA - ultra-low leakage ensures minimal standby power loss in high-impedance circuits |
| TJ max | +150 °C - enables use in under-hood automotive or high-temperature industrial environments |
Pinout & Package
Package: SMC (DO-214AB) - surface-mount, low-profile plastic case with matte tin-plated leads; meets UL 94 V-0 flammability and JESD 201 Class 2 whisker resistance requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Protected line connection (anode grounded) | Reverse-biased during normal operation; conducts only during positive transients on cathode side |
| Anode | Ground or reference return path | Provides low-impedance surge current path to ground; must be routed with minimal inductance |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 µs) | Enables protection against severe lightning surges (IEC 61000-4-5 Level 4) on 24 V systems |
| Glass-passivated junction | Ensures long-term stability of VBR and low parameter drift over temperature and life cycle |
| MSL Level 1 (260 °C peak) | Supports standard lead-free reflow without moisture-related popcorning or delamination |
| Halogen-free & RoHS-compliant (M3 suffix) | Fulfills environmental compliance for automotive and industrial OEM supply chains |
| AEC-Q101 qualification option | Validated for automotive electronics reliability (HTOL, TCT, ESD, etc.) when ordered as HM3 variant |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
|
Use Scenario: Protects microcontroller GPIO and CAN transceiver power rails from load-dump and jump-start transients in 12 V vehicle systems. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between VBAT and GND, upstream of LDO regulators. Use Value: Limits voltage to ≤25.2 V during 1500 W surges, preventing latch-up or gate oxide damage in downstream 3.3 V/5 V logic. |
Use Scenario: Shields 24 V digital input optocoupler front-end from inductive kickback when switching solenoids or relays. IC Role / Device Role / Timing Role: Standoff-rated TVS (VWM = 15.3 V) placed across input terminals to clamp transients before signal conditioning. Use Value: Maintains <1 µA leakage at 24 V nominal, avoiding false triggering while clamping 59.5 A surges within nanoseconds. |
| Telecom Power Supply Output | Consumer Appliance Motor Drive Board |
|
Use Scenario: Safeguards secondary-side 12 V/5 V outputs of AC-DC adapters against conducted surges from mains or connected equipment. IC Role / Device Role / Timing Role: Secondary-side TVS on regulated output rail, coordinated with primary-side MOV and Y-cap filtering. Use Value: Fast <1 ns response and low clamping voltage preserve output regulation integrity during repetitive 10/1000 µs surges. |
Use Scenario: Guards MCU reset and communication lines (UART, I²C) from ESD and motor commutation noise in washing machine control boards. IC Role / Device Role / Timing Role: Localized point-of-use TVS on microcontroller pins, mounted adjacent to connectors and motor drivers. Use Value: Low capacitance (<100 pF at 0 V) avoids signal integrity degradation on 100 kHz–1 MHz bus lines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18A-T | Same VBR range (17.1–18.9 V), but lower PPPM = 600 W and SMB (DO-214AA) package (smaller footprint, higher thermal resistance) | Limited to lower-energy transients (e.g., ESD, contact discharge); unsuitable for IEC 61000-4-5 Level 3+ | Select when board space is constrained and surge energy is ≤600 W; verify thermal derating for sustained duty cycles |
| 1.5KE18A | Through-hole TO-204AE (DO-41) package; identical electrical specs but incompatible mounting and higher profile | Requires PCB redesign for through-hole assembly; not suitable for automated SMT lines | Choose only for legacy repair, prototyping, or where manual assembly is acceptable and SMT is unavailable |
Compared with SMBJ18A-T and 1.5KE18A, the 1.5SMC18A-M3/9AT delivers full 1500 W surge handling in an SMT-optimized SMC package with halogen-free compliance - making it the preferred choice for volume automotive and industrial production requiring AEC-Q101 readiness and robust layout scalability.
Availability
1.5SMC18A-M3/9AT is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, telecom power supplies, and consumer appliance motor control systems requiring stable component supply and long-term lifecycle support.
Supply support for 1.5SMC18A-M3/9AT 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, efficiency, and application-specific validation.
The 1.5SMC Series was engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where robustness, AEC-Q101 readiness, and consistent clamping performance are mandatory.
FAQ
What is the standoff voltage (VWM) of the 1.5SMC18A-M3/9AT?
The 1.5SMC18A-M3/9AT has a maximum reverse stand-off voltage (VWM) of 15.3 V at 25 °C. This value ensures the device remains non-conductive during normal operation up to this voltage level, with reverse leakage current limited to ≤1.0 µA - critical for preserving signal integrity and minimizing standby power loss in 12 V or 24 V systems.
Is the 1.5SMC18A-M3/9AT AEC-Q101 qualified?
The 1.5SMC18A-M3/9AT itself is not AEC-Q101 qualified; however, the M3 suffix indicates halogen-free and RoHS-compliant construction, and Vishay offers AEC-Q101-qualified versions under the HM3 suffix (e.g., 1.5SMC18AHM3_A/I). For automotive production, specify the HM3 variant to ensure full qualification testing including HTOL, temperature cycling, and ESD robustness.
What is the clamping voltage (VC) of the 1.5SMC18A-M3/9AT at its rated peak pulse current?
At its rated peak pulse current (IPPM) of 59.5 A (10/1000 µs waveform), the 1.5SMC18A-M3/9AT clamps to a maximum voltage of 25.2 V. This clamping performance ensures downstream components - such as 3.3 V or 5 V microcontrollers, CAN transceivers, or MOSFET gates - remain within safe operating voltage limits during high-energy transients.
Can the 1.5SMC18A-M3/9AT be used in bidirectional configurations?
No - the 1.5SMC18A-M3/9AT is a unidirectional TVS diode, identifiable by its cathode band marking. For bidirectional protection, Vishay offers the 1.5SMC18CA variant (with CA suffix), which provides symmetrical clamping in both polarities and no polarity marking. Using the unidirectional 1.5SMC18A-M3/9AT in AC or floating applications risks failure due to reverse conduction.
What is the thermal resistance (RθJA) of the 1.5SMC18A-M3/9AT in standard mounting conditions?
The 1.5SMC18A-M3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on minimum recommended copper pads (0.31" × 0.31", 8.0 mm × 8.0 mm per terminal). This value assumes natural convection cooling; thermal performance improves significantly with larger copper areas or forced airflow - essential for sustained surge duty cycles.
1.5SMC18A-M3/9AT 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
1.5SMC18A-M3/9AT FAQ
1.How can I place an order for 1.5SMC18A-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC18A-M3/9AT 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 1.5SMC18A-M3/9AT reliable?
The price and inventory of 1.5SMC18A-M3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC18A-M3/9AT is usually 5 days.
3.What payment methods are accepted for 1.5SMC18A-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC18A-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC18A-M3/9AT?
1.5SMC18A-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC18A-M3/9AT 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 1.5SMC18A-M3/9AT?
For technical support, including 1.5SMC18A-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC18A-M3/9AT requirements.
6.How does Aetrix verify that 1.5SMC18A-M3/9AT is sourced from the original manufacturer or authorized distributors?
All 1.5SMC18A-M3/9AT 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 1.5SMC18A-M3/9AT meets industry standards.
7.What is the process for return or replacement of 1.5SMC18A-M3/9AT?
All 1.5SMC18A-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC18A-M3/9AT, 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 1.5SMC18A-M3/9AT part is unused and in its original packaging.
Return procedure for 1.5SMC18A-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC18A-M3/9AT Tags
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