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Taiwan Semiconductor Corporation 1.5SMC20A
- Part No.:
- 1.5SMC20A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC20A.pdf
- Description:
- TVS DIODE 17.1VWM 27.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,682
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Product details
Overview
1.5SMC20A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for primary-level overvoltage protection in DC power rails and signal lines. It features a 19.0–21.0 V breakdown voltage (VBR), 17.1 V working stand-off voltage (VWM), 27.7 V maximum clamping voltage (VC) at 56 A peak pulse current, and 1500 W peak pulse power rating per 10/1000 µs waveform - deployed in telecom front-ends, industrial I/O ports, and automotive body-control modules.
For engineers reviewing the 1.5SMC20A datasheet, 1.5SMC20A pinout, 1.5SMC20A application, or 1.5SMC20A equivalent, this page delivers verified electrical specs, DO-214AB package details, clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, thermal resistance data (RθJA = 50 °C/W), and real-world ESD/transient immunity context for layout and system-level surge design.
Technical Context
The 1.5SMC20A operates as a silicon avalanche diode with glass-passivated junction, enabling sub-1 ps response to transients and <1 µA leakage above 17.1 V. Its unidirectional configuration provides forward conduction only during reverse-biased overvoltage events, with VF = 3.5 V at 50 A for forward surge handling.
Thermally rated for TJ = –55 °C to +150 °C, it uses DO-214AB (SMC) packaging with matte tin-plated leads compliant to J-STD-002 solderability and JESD 201 Class 2 whisker resistance. Junction-to-case thermal resistance is 15 °C/W, supporting reliable power dissipation in high-density PCB layouts without forced airflow.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR @ IT = 1 mA | 19.0–21.0 V - defines minimum reverse breakdown threshold; ensures reliable triggering before downstream IC damage |
| VWM | 17.1 V - maximum continuous DC operating voltage; sets safe margin below breakdown for stable rail protection |
| VC @ IPPM = 56 A | 27.7 V - clamped voltage during 10/1000 µs surge; determines worst-case stress on protected circuitry |
| PPK | 1500 W - peak pulse power handling per single transient; supports robust immunity to lightning-induced surges |
| IR @ VWM | <1 µA - ultra-low leakage at stand-off voltage; avoids unnecessary power loss in battery-powered systems |
| TJ max | +150 °C - maximum junction temperature; enables operation in under-hood automotive or enclosed industrial enclosures |
| RθJA | 50 °C/W - thermal resistance from junction to ambient; informs heatsinking requirements in sustained surge scenarios |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, unidirectional configuration with cathode band marking. Case meets UL 94V-0 flammability rating; terminals are matte tin-plated and solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path / low-impedance return during surge | Connects to protected line's ground or low-side reference; carries full 56 A peak surge current in clamp mode |
| Cathode | Reverse-biased terminal / clamping node | Connected to the line being protected (e.g., 12 V rail); initiates avalanche conduction when VIN exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enables stable, repeatable avalanche characteristics across temperature and lifetime; eliminates passivation-related drift in clamping voltage |
| <1.0 ps response time | Clamps transients before sensitive logic or analog circuits experience overstress - critical for USB, RS-485, and CAN physical layers |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validated for automotive load-dump and inductive-switching immunity; qualifies for use in 12 V/24 V vehicle subsystems |
| Moisture sensitivity level 1 (J-STD-020) | Zero bake requirement prior to reflow; supports standard SMT assembly without moisture-related popcorning risk |
| RoHS & halogen-free (IEC 61249-2-21) | Meets global environmental compliance mandates for industrial and consumer end-equipment without compromising surge performance |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
Use Scenario: Protects 12 V supply inputs against load dump (ISO 7637-2 Pulse 5a) and alternator ripple-induced spikes. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed upstream of LDO regulators and microcontroller power domains. Use Value: Limits rail voltage to ≤27.7 V during 1500 W surges, preventing brownout resets and gate oxide damage in 3.3 V/5 V logic. |
Use Scenario: Shields 24 V digital input channels from field-wiring induced transients (e.g., relay coil de-energization). IC Role / Device Role / Timing Role: Front-end TVS on optocoupler input side, absorbing energy before signal conditioning circuitry. Use Value: Clamps 56 A pulses within 10/1000 µs while maintaining <1 µA leakage - preserving input threshold accuracy and long-term reliability. |
| Telecom Power Feeding Interface | Consumer USB-C Port Protection |
Use Scenario: Safeguards PoE-powered equipment (e.g., IP cameras) from Ethernet cable-induced surges and ESD events. IC Role / Device Role / Timing Role: Secondary protection stage after common-mode chokes, targeting differential-mode overvoltage on DC feed lines. Use Value: Delivers 1500 W pulse handling with 27.7 V clamping - compatible with IEEE 802.3af/at voltage margins and thermal derating curves. |
Use Scenario: Guards VBUS line in USB-C receptacles against hot-plug transients and contact bounce during insertion. IC Role / Device Role / Timing Role: Fast-acting unidirectional clamp between VBUS and GND, placed immediately at connector footprint. Use Value: Sub-1 ps response captures initial ESD edge; 17.1 V VWM allows safe operation across USB-C 5–20 V profiles without false triggering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20A (Bourns) | Same DO-214AA (SMB) package; 20 V nominal VBR, 32.4 V VC @ 46.7 A; lower PPK = 600 W | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 5a or lightning-simulated surges | Select SMBJ20A only for space-constrained designs where 600 W peak power suffices and thermal budget permits higher VC. |
| SMCJ20A (Littelfuse) | Identical DO-214AB (SMC) package; 20 V nominal VBR, 32.4 V VC @ 46.7 A; same 1500 W rating but higher VC | Higher clamping voltage reduces margin for 3.3 V/5 V downstream ICs; requires verification of protected device VDSM | Choose SMCJ20A if sourcing flexibility is prioritized and system-level testing confirms 32.4 V clamping remains within safe operating area. |
Compared with SMBJ20A and SMCJ20A, the 1.5SMC20A offers the lowest clamping voltage (27.7 V) among 1500 W DO-214AB TVS diodes at 20 V rating - delivering tighter overvoltage control for modern low-voltage electronics without sacrificing surge energy handling.
Availability
1.5SMC20A is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC input cards, telecom power feeding interfaces, and consumer USB-C port protection requiring stable component supply and full traceability.
Supply support for 1.5SMC20A 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 for industrial, automotive, and consumer markets.
The 1.5SMCxx(A) series was engineered specifically for high-reliability, surface-mount transient suppression in harsh environments - emphasizing low clamping voltage, ISO 7637-2 compliance, and J-STD-020 Level 1 moisture robustness.
FAQ
What is the breakdown voltage range for the 1.5SMC20A?
The 1.5SMC20A has a guaranteed breakdown voltage (VBR) range of 19.0 V to 21.0 V at 1 mA test current, measured per ANSI/IEEE C62.35. This tight tolerance ensures consistent triggering behavior across production lots and temperature extremes, making the 1.5SMC20A suitable for precision rail protection where overvoltage margin must be tightly controlled.
Is the 1.5SMC20A unidirectional or bidirectional?
The 1.5SMC20A is a unidirectional TVS diode, indicated by the absence of "C" or "CA" suffix. It conducts only in reverse bias during overvoltage events and exhibits forward voltage (VF) of 3.5 V at 50 A for surge current handling. Bidirectional variants require explicit "C" or "CA" designation (e.g., 1.5SMC20CA), which the 1.5SMC20A does not carry.
What is the maximum clamping voltage of the 1.5SMC20A under surge conditions?
The 1.5SMC20A clamps to a maximum of 27.7 V when subjected to its rated 56 A peak pulse current (IPPM) under the standardized 10/1000 µs waveform. This value is measured at TA = 25 °C and defines the upper voltage limit imposed on protected circuitry during worst-case transient events - critical for ensuring compatibility with 3.3 V, 5 V, or 12 V ICs.
Does the 1.5SMC20A meet automotive surge immunity standards?
Yes, the 1.5SMC20A meets ISO 7637-2 requirements for Pulse 1 (inductive load disconnect), Pulse 2a (sudden load removal), Pulse 2b (supply interruption), Pulse 3a (capacitive discharge), and Pulse 3b (inductive switching). Its 1500 W peak power rating and 27.7 V clamping enable robust protection in 12 V automotive subsystems such as body control modules and infotainment power supplies.
What is the thermal resistance of the 1.5SMC20A, and how does it affect layout?
The 1.5SMC20A has a junction-to-ambient thermal resistance (RθJA) of 50 °C/W and junction-to-case resistance (RθJC) of 15 °C/W. These values indicate that PCB copper area and thermal vias significantly influence steady-state temperature rise; for continuous surge duty, designers should allocate ≥100 mm² of 2-oz copper connected to both terminals to maintain TJ ≤150 °C per derating curve in Figure 2.
1.5SMC20A 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):
- 17.1V
- Voltage - Breakdown (Min):
- 19V
- Voltage - Clamping (Max) @ Ipp:
- 27.7V
- Current - Peak Pulse (10/1000µs):
- 56A
- 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)
1.5SMC20A FAQ
1.How can I place an order for 1.5SMC20A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC20A 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 1.5SMC20A reliable?
The price and inventory of 1.5SMC20A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC20A is usually 5 days.
3.What payment methods are accepted for 1.5SMC20A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC20A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC20A?
1.5SMC20A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC20A 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 1.5SMC20A?
For technical support, including 1.5SMC20A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC20A requirements.
6.How does Aetrix verify that 1.5SMC20A is sourced from the original manufacturer or authorized distributors?
All 1.5SMC20A 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 1.5SMC20A meets industry standards.
7.What is the process for return or replacement of 1.5SMC20A?
All 1.5SMC20A units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC20A, 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 1.5SMC20A part is unused and in its original packaging.
Return procedure for 1.5SMC20A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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