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Taiwan Semiconductor Corporation 1.5SMC20
- Part No.:
- 1.5SMC20
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC20.pdf
- Description:
- 1500W, 20V, 10%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:9,872
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Product details
Overview
1.5SMC20 from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for primary-level surge protection in DC power rails and signal lines. It features a 20V breakdown voltage (VBR = 18.0–22.0 V), 1500W peak pulse power rating, and clamps transients to ≤29.1V at 54A, making it suitable for protecting Ethernet PHYs, industrial I/O ports, and automotive body control modules.
For engineers reviewing the 1.5SMC20 datasheet, 1.5SMC20 pinout, 1.5SMC20 application, or 1.5SMC20 equivalent, key selection criteria include its DO-214AB (SMC) package compatibility, 16.2V working stand-off voltage, sub-1ps response time, and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive load-dump and switching transient immunity.
Technical Context
The 1.5SMC20 operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to achieve stable breakdown behavior and low leakage (<1 µA at 16.2V). Its thermal design supports continuous operation up to +150°C junction temperature, with RθJA = 50°C/W enabling effective PCB heat dissipation in high-density layouts.
It delivers fast transient suppression with typical response time <1.0 ps and meets stringent automotive EMC requirements including ISO 7637-2 Pulse 1 (inductive load dump), Pulse 2a (battery disconnect), and Pulse 3a/3b (line impedance stabilization network transients), validated under standardized 10/1000 µs current waveforms.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 18.0 V / 22.0 V - defines guaranteed avalanche initiation range at 1.0 mA test current; ensures reliable turn-on before downstream IC damage thresholds. |
| VWM | 16.2 V - maximum continuous reverse operating voltage; sets safe DC bias margin below breakdown for stable rail protection. |
| VC @ IPPM | 29.1 V at 54 A - clamping voltage during 10/1000 µs surge; determines worst-case overvoltage seen by protected circuitry. |
| PPK | 1500 W - peak pulse power handling per single 1ms event; enables robust protection against lightning-induced surges and ESD events. |
| IR @ VWM | <1 µA - ultra-low reverse leakage at rated stand-off voltage; minimizes standby power loss and avoids false triggering in high-impedance sensing paths. |
| TJ max | +150 °C - maximum junction temperature; supports operation in under-hood automotive and industrial environments without derating. |
| Package | DO-214AB (SMC) - industry-standard surface-mount outline with 7.11 mm × 6.22 mm footprint and matte tin-plated leads compliant with J-STD-002 solderability. |
Pinout & Package
Package: DO-214AB (SMC), molded plastic case with polarity-indicating cathode band; weight ≈ 0.210 g; UL 94V-0 flammability rated; moisture sensitivity level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., GND or return path); conducts during forward surge events (e.g., reverse battery connection). |
| Cathode | Avalanche clamping terminal | Connected to protected line (e.g., 12V rail or data line); initiates clamping when reverse voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable, repeatable breakdown voltage over temperature and lifetime; eliminates parameter drift due to environmental oxidation or contamination. |
| Sub-1 ps response time | Enables suppression of nanosecond-scale ESD transients before sensitive CMOS inputs latch-up or gate oxide ruptures. |
| ISO 7637-2 compliance | Validated for automotive-grade surge immunity across Pulse 1 (inductive kick), Pulse 2a (battery disconnection), and Pulse 3a/3b (switching noise), reducing need for system-level retesting. |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU; supports green manufacturing and end-of-life recycling requirements. |
| Automated placement compatibility | DO-214AB geometry and matte tin plating ensure reliable pick-and-place yield and reflow solder joint integrity in high-volume SMT lines. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input |
|---|---|
Use Scenario: Protects microcontroller GPIOs and CAN transceiver power rails from load-dump surges during alternator regulation faults. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 12V supply and ground, clamping transients within 10/1000 µs waveform envelope. Use Value: Limits peak voltage to ≤29.1 V during 54 A surge, preventing damage to 3.3V/5V logic supplies and ensuring ASIL-B functional safety compliance. | Use Scenario: Shields 24V digital input channels from field-wiring induced transients caused by relay coil de-energization or motor contactor switching. IC Role / Device Role / Timing Role: Primary surge clamp on input front-end, positioned upstream of optocoupler or Schmitt trigger conditioning stage. Use Value: Withstands ≥1500W pulses while maintaining <1 µA leakage at 16.2V, eliminating false triggering in high-impedance sensor monitoring circuits. |
| Telecom Ethernet PHY Port | Consumer Appliance Power Supply |
Use Scenario: Guards RJ45 magnetics secondary-side DC bias lines against ESD and lightning-induced common-mode surges entering via unshielded cabling. IC Role / Device Role / Timing Role: Unidirectional TVS on PHY VDDIO rail, coordinated with common-mode chokes and secondary-side capacitors. Use Value: Clamps 8 kV contact ESD events to <30 V within <1 ps, preserving Ethernet link integrity and avoiding PHY reset or packet corruption. | Use Scenario: Suppresses switching noise and inductive kickback from AC relay drivers and triac-based heater controls in smart home appliances. IC Role / Device Role / Timing Role: Rail-to-rail TVS on 5V/12V internal supply lines feeding MCU, display driver, and communication ICs. Use Value: Provides 1500W surge capacity with 50°C/W thermal resistance, enabling compact PCB layout without heatsinking in enclosed plastic enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20A (Bourns) | Same DO-214AA (SMB) package; bidirectional variant; VBR = 22.2–24.5 V; VC = 32.4 V @ 46.5 A | Designed for bidirectional signal-line protection; higher clamping voltage reduces margin for 20V-rail systems | Select only if bidirectional surge immunity is required and board layout allows SMB footprint. |
| P6SMB20A (Littelfuse) | DO-214AA (SMB) package; VBR = 22.2–24.5 V; PPK = 600 W; VC = 32.4 V @ 18.5 A | Lower peak power rating limits use to low-energy transients; not suitable for ISO 7637-2 Pulse 1 | Acceptable only for consumer-grade ESD-only protection where 1500W surge capability is unnecessary. |
Compared with SMBJ20A and P6SMB20A, the 1.5SMC20 offers superior 1500W surge handling in the larger DO-214AB package, tighter VBR tolerance (18.0–22.0 V), and lower clamping voltage (29.1 V), making it optimal for automotive and industrial 12–24V rail protection where energy absorption and voltage margin are critical.
Availability
1.5SMC20 is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC digital inputs, telecom Ethernet PHY ports, and consumer appliance power supplies requiring stable component supply and long-term lifecycle support.
Supply support for 1.5SMC20 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 developed specifically for high-energy transient suppression in automotive and industrial environments, emphasizing ISO 7637-2 compliance, tight parametric tolerances, and robust thermal performance in surface-mount packages.
FAQ
What is the breakdown voltage range of the 1.5SMC20?
The 1.5SMC20 has a guaranteed breakdown voltage range of 18.0 V to 22.0 V at 1.0 mA test current (VBR), measured per ANSI/IEEE C62.35. This range ensures consistent avalanche initiation across production lots and temperature extremes, directly supporting reliable overvoltage protection in 12V and 24V systems where the 1.5SMC20 is deployed.
Is the 1.5SMC20 unidirectional or bidirectional?
1.5SMC20 is a unidirectional TVS diode, indicated by the absence of "C" or "CA" suffix. It protects against reverse-polarity transients on positive rails only. For bidirectional protection (e.g., AC signal lines), the 1.5SMC20C variant must be used - the 1.5SMC20 itself conducts forward current up to 200A but clamps only in reverse bias above VBR.
What is the maximum clamping voltage of the 1.5SMC20 during a surge event?
The 1.5SMC20 clamps to a maximum of 29.1 V when subjected to its rated 54 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured at TA = 25°C and defines the highest voltage stress imposed on downstream circuitry during worst-case surge conditions, making it critical for validating voltage margins of protected ICs.
Does the 1.5SMC20 meet automotive surge immunity standards?
Yes, the 1.5SMC20 meets ISO 7637-2 requirements for Pulse 1 (inductive load dump), Pulse 2a (battery disconnect), and Pulse 3a/3b (switching transients), verified per the manufacturer's test report and curve data. Its 1500W peak power rating and thermal design (RθJC = 15°C/W) enable sustained compliance in automotive under-hood applications where the 1.5SMC20 is commonly applied.
What package type does the 1.5SMC20 use, and is it compatible with automated assembly?
The 1.5SMC20 uses the DO-214AB (SMC) surface-mount package - 7.11 mm × 6.22 mm outline with matte tin-plated leads - fully compatible with J-STD-002 solderability and JESD201 Class 2 whisker resistance. Its geometry and finish ensure high-yield automated placement and reflow, and the 3,000-piece tape-and-reel packaging supports direct SMT line integration for the 1.5SMC20.
1.5SMC20 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):
- 16.2V
- Voltage - Breakdown (Min):
- 18V
- Voltage - Clamping (Max) @ Ipp:
- 29.1V
- Current - Peak Pulse (10/1000µs):
- 54A
- 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)
1.5SMC20 FAQ
1.How can I place an order for 1.5SMC20 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC20 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 1.5SMC20 reliable?
The price and inventory of 1.5SMC20 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC20 is usually 5 days.
3.What payment methods are accepted for 1.5SMC20?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC20 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC20?
1.5SMC20 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC20 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 1.5SMC20?
For technical support, including 1.5SMC20 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC20 requirements.
6.How does Aetrix verify that 1.5SMC20 is sourced from the original manufacturer or authorized distributors?
All 1.5SMC20 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 1.5SMC20 meets industry standards.
7.What is the process for return or replacement of 1.5SMC20?
All 1.5SMC20 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC20, 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 1.5SMC20 part is unused and in its original packaging.
Return procedure for 1.5SMC20:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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