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Taiwan Semiconductor Corporation 1.5SMC18
- Part No.:
- 1.5SMC18
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC18.pdf
- Description:
- 1500W, 18V, 10%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:3,867
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Product details
Overview
1.5SMC18 from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, rated for 1500W peak pulse power, 16.2–19.8V breakdown voltage (VBR), and 26.5V clamping voltage (VC) at 59A peak impulse current. It protects DC power rails and signal lines in telecom and industrial equipment against ESD, lightning surges, and load-switching transients.
For engineers reviewing the 1.5SMC18 datasheet, 1.5SMC18 pinout, 1.5SMC18 application, or 1.5SMC18 equivalent, key selection criteria include working stand-off voltage (14.5V), low leakage (<1µA at VWM), fast sub-1ps response, and ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance - all critical for robust overvoltage protection in automotive and industrial power interfaces.
Technical Context
The 1.5SMC18 operates as a unidirectional avalanche diode with glass-passivated junction, optimized for clamping transients on positive-polarity DC lines. Its 150°C maximum junction temperature and 50°C/W junction-to-ambient thermal resistance support reliable operation under sustained surge stress in enclosed enclosures.
Designed per ANSI/IEEE C62.35, it delivers precise breakdown behavior with ±5% VBR tolerance (16.2–19.8V @ 1mA), 0.088%/°C temperature coefficient, and meets JESD201 Class 2 whisker resistance - enabling stable performance across automotive (-40°C to +125°C ambient) and industrial temperature ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 16.2V / 19.8V @ 1mA - defines minimum and maximum voltage at which avalanche conduction begins, ensuring predictable turn-on across production lot |
| VWM | 14.5V - maximum continuous reverse operating voltage; must exceed system nominal DC rail (e.g., 12V bus) to prevent leakage during normal operation |
| VC @ IPPM | 26.5V @ 59A - clamped voltage during 10/1000µs surge; determines maximum stress imposed on downstream ICs during transient events |
| PPK | 1500W - peak pulse power rating per 1ms waveform; enables suppression of high-energy transients without thermal runaway |
| IR @ VWM | <1µA - ultra-low reverse leakage ensures minimal standby power loss and avoids false triggering in high-impedance sensing circuits |
| TJ max | +150°C - maximum junction temperature; supports operation in thermally constrained PCB layouts with limited airflow |
| Package | DO-214AB (SMC) - industry-standard surface-mount outline with 7.11mm × 6.22mm footprint and matte tin-plated leads compliant with J-STD-002 solderability |
Pinout & Package
DO-214AB (SMC) package: molded plastic case with cathode band marking; polarity-sensitive unidirectional configuration; terminals are lead-free matte tin-plated, RoHS and halogen-free compliant per IEC 61249-2-21.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Low-side reference node | Connected to ground or low-voltage return path; forms current sink during transient clamp |
| Cathode (banded end) | Protected line input | Connected to the line being protected (e.g., 12V supply); conducts avalanche current when VIN exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR and low leakage over lifetime, even under humidity and thermal cycling stress |
| Sub-1ps response time | Clamps ESD events before sensitive logic or analog circuitry sustains damage, meeting IEC 61000-4-2 Level 4 requirements |
| ISO 7637-2 compliance | Validated for automotive load-dump and switching transient immunity (Pulse 1, 2a, 2b, 3a, 3b), supporting 12V/24V vehicle electronics |
| J-STD-020 Level 1 moisture sensitivity | Enables standard SMT reflow without pre-bake, reducing manufacturing complexity and cost |
| UL 94V-0 molding compound | Prevents flame propagation during fault conditions, satisfying safety standards for industrial and telecom enclosures |
Applications
| Automotive Power Line Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting 12V battery-fed ECUs from load dump and alternator transients in passenger vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and regulator input to clamp surges up to 1500W without failure. Use Value: Limits clamped voltage to 26.5V, preventing overvoltage damage to downstream LDOs and microcontrollers while surviving repeated ISO 7637-2 Pulse 5a events. | Use Scenario: Safeguarding digital input channels of programmable logic controllers against field-wiring induced surges. IC Role / Device Role / Timing Role: Mounted at connector entry point to shunt induced transients before they reach optocoupler or Schmitt-trigger input stages. Use Value: Sub-1ps response ensures clamping occurs before transient edge propagates into isolation barrier, preserving signal integrity and functional safety integrity. |
| Telecom DC Power Feeds | Consumer Equipment USB/DC Jacks |
Use Scenario: Securing -48V or +24V telecom power distribution boards against lightning-induced surges on outdoor plant wiring. IC Role / Device Role / Timing Role: Paired with series fuse and common-mode choke to form coordinated protection network on primary DC input. Use Value: 1500W rating handles multi-kA induced currents from nearby strikes; 14.5V VWM allows use on 12V auxiliary rails without leakage concerns. | Use Scenario: Adding surge immunity to wall-adapter powered consumer devices (e.g., set-top boxes, routers) at DC barrel jack inputs. IC Role / Device Role / Timing Role: First-line defense against user-insertion ESD and adapter plug-in transients on unregulated input path. Use Value: Low 1µA leakage prevents battery drain in always-on standby modes; DO-214AB footprint enables compact layout near connector with no additional board area penalty. |
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 (Bourns) | Same DO-214AA (SMB) package; 18V VBR min/max = 19.0–20.9V; 600W PPK; higher VC = 29.2V @ 20.5A | Limited to lower-energy transients; not suitable for ISO 7637-2 Pulse 5a or high-current lightning surges | Select SMBJ18A only when space constraints require smaller SMB footprint and surge energy remains below 600W |
| 1.5KE18A (ON Semiconductor) | Through-hole DO-15 package; identical VBR range (16.2–19.8V); same 1500W rating; VC = 27.7V @ 54A | Requires through-hole assembly; incompatible with fully SMT production; unsuitable for high-density or double-sided PCBs | Choose 1.5KE18A only for legacy through-hole designs or prototyping where reflow compatibility is not required |
Compared with SMBJ18A and 1.5KE18A, the 1.5SMC18 uniquely combines SMT-compatible DO-214AB packaging, full 1500W surge capability, and 26.5V clamping - making it optimal for automotive and industrial applications demanding both high energy handling and automated assembly.
Availability
1.5SMC18 is available at Aetrix Electronics and suitable for automotive power line protection, industrial PLC I/O protection, telecom DC power feeds, and consumer equipment DC jacks requiring stable component supply and full traceability.
Supply support for 1.5SMC18 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs, with global distribution and AEC-Q101 qualified product lines.
The 1.5SMC series was engineered specifically for high-reliability surface-mount transient suppression in automotive, industrial, and telecom infrastructure - emphasizing robust clamping, low leakage, and process-controlled VBR consistency.
FAQ
What is the breakdown voltage range of the 1.5SMC18?
The 1.5SMC18 has a guaranteed breakdown voltage (VBR) range of 16.2V to 19.8V at 1mA test current, measured per ANSI/IEEE C62.35. This ±10% tolerance ensures consistent avalanche turn-on across production lots and supports reliable protection margin design for 12V systems.
Is the 1.5SMC18 unidirectional or bidirectional?
1.5SMC18 is a unidirectional TVS diode, indicated by the absence of "C" or "CA" suffix. It protects only positive-going transients on DC lines with cathode connected to the protected line and anode to ground. For bidirectional AC or data-line protection, TSC offers 1.5SMC18C variants.
What is the maximum clamping voltage of the 1.5SMC18 during a surge event?
The 1.5SMC18 clamps to a maximum of 26.5V at its rated peak impulse current of 59A (10/1000µs waveform). This value is measured under standardized surge conditions and defines the upper voltage limit imposed on downstream circuitry during worst-case transient events.
Does the 1.5SMC18 meet automotive transient immunity standards?
Yes, the 1.5SMC18 meets ISO 7637-2 requirements for Pulse 1, 2a, 2b, 3a, and 3b, making it suitable for protecting 12V and 24V automotive electronic control units against load-dump, inductive switching, and battery connection transients per OEM specifications.
What is the thermal resistance of the 1.5SMC18 and how does it affect layout?
The 1.5SMC18 has a junction-to-ambient thermal resistance (RθJA) of 50°C/W. To maintain safe operation under repeated surges, PCB layout must include adequate copper pour (≥100 mm² per side) connected to both terminals, especially the cathode, to dissipate heat and avoid exceeding the 150°C maximum junction temperature.
1.5SMC18 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- 1.5SMC
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 14.5V
- Voltage - Breakdown (Min):
- 16.2V
- Voltage - Clamping (Max) @ Ipp:
- 26.5V
- Current - Peak Pulse (10/1000µs):
- 59A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
1.5SMC18 FAQ
1.How can I place an order for 1.5SMC18 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC18 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 1.5SMC18 reliable?
The price and inventory of 1.5SMC18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC18 is usually 5 days.
3.What payment methods are accepted for 1.5SMC18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC18?
1.5SMC18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC18 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 1.5SMC18?
For technical support, including 1.5SMC18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC18 requirements.
6.How does Aetrix verify that 1.5SMC18 is sourced from the original manufacturer or authorized distributors?
All 1.5SMC18 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 1.5SMC18 meets industry standards.
7.What is the process for return or replacement of 1.5SMC18?
All 1.5SMC18 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC18, 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 1.5SMC18 part is unused and in its original packaging.
Return procedure for 1.5SMC18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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