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Taiwan Semiconductor Corporation 1.5SMC22
- Part No.:
- 1.5SMC22
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC22.pdf
- Description:
- 1500W, 22V, 10%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:9,259
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Product details
Overview
1.5SMC22 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 19.8–24.2 V breakdown voltage (VBR), 17.8 V working stand-off voltage (VWM), 31.9 V maximum clamping voltage (VC) at 49 A peak pulse current, and 1500 W peak pulse power rating per 10/1000 µs waveform - deployed in telecom front-ends, industrial I/O modules, and automotive body control units.
For engineers reviewing the 1.5SMC22 datasheet, 1.5SMC22 pinout, 1.5SMC22 application, or 1.5SMC22 equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, junction-to-ambient thermal resistance (50 °C/W), unidirectional polarity marking, and DO-214AB (SMC) package compatibility with automated SMT placement.
Technical Context
The 1.5SMC22 operates as a silicon avalanche diode with glass-passivated junction, delivering sub-1 ps response time to transient events. Its unidirectional configuration enables asymmetric clamping - conducting only during reverse overvoltage while blocking forward conduction above ~3.5 V (per VF spec for this voltage range).
Thermally, it sustains 150 °C maximum junction temperature with 6.5 W steady-state power dissipation and relies on PCB copper area for heat spreading, given its 50 °C/W junction-to-ambient thermal resistance. The device meets JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 19.8 V / 24.2 V - defines minimum and maximum voltage at which avalanche conduction begins under 1 mA test current; sets threshold for reliable transient suppression onset |
| VWM | 17.8 V - maximum continuous DC or RMS voltage the device blocks without significant leakage; must exceed system operating voltage by ≥10% |
| VC @ IPPM | 31.9 V at 49 A - clamped voltage seen across protected circuit during 10/1000 µs surge; determines worst-case overvoltage stress on downstream components |
| PPK | 1500 W - peak pulse power handling capability per single non-repetitive 10/1000 µs transient; defines survivability against lightning-induced surges |
| IR @ VWM | <1 µA - reverse leakage current at rated stand-off voltage; ensures negligible standby power loss and no interference with high-impedance sensing nodes |
| TJ max | +150 °C - maximum allowable junction temperature; constrains layout thermal design and derating above 25 °C ambient |
| RθJA | 50 °C/W - thermal resistance from junction to ambient air; used to calculate temperature rise under sustained power dissipation |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, unidirectional configuration with cathode band marking. Case meets UL 94V-0 flammability rating; matte tin-plated leads comply with J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connects to lower-potential side of protected line; conducts during forward surge (e.g., reverse battery connection) up to 200 A peak |
| Cathode | Avalanche clamping terminal | Connects to higher-potential side; initiates avalanche breakdown when reverse voltage exceeds VBR, shunting surge current to ground |
Key Features
| Feature | Design Value |
|---|---|
| Clamping performance | VC/VBR ratio = 1.32 - low clamping factor ensures minimal overvoltage exposure to protected ICs during transients |
| Response speed | <1.0 ps - enables suppression before sensitive logic or analog circuits experience damaging voltage overshoot |
| Automated assembly support | DO-214AB (SMC) footprint - compatible with standard pick-and-place equipment and reflow profiles per J-STD-020 Level 1 |
| Transient immunity compliance | Fully meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b - validated for automotive load-dump and inductive switching environments |
| Environmental compliance | RoHS-compliant and halogen-free per IEC 61249-2-21 - suitable for consumer, industrial, and automotive supply chains with strict material restrictions |
Applications
| Industrial PLC Digital I/O Protection | Automotive Body Control Module (BCM) Power Input |
|---|---|
Use Scenario: Protecting 24 V DC digital input channels in programmable logic controllers from inductive kickback and ESD during field wiring. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed between input terminal and ground, absorbing >1 kV transients before they reach input buffer ICs. Use Value: Limits voltage to ≤31.9 V during 49 A surge, preventing latch-up or gate oxide damage in 3.3 V/5 V interface ICs downstream. |
Use Scenario: Safeguarding 12 V supply rail of BCM microcontroller and CAN transceivers against load dump (ISO 7637-2 Pulse 5a) and jump-start transients. IC Role / Device Role / Timing Role: First-line TVS on main power entry, placed upstream of DC-DC converter input to prevent overvoltage propagation. Use Value: Withstands 1500 W peak pulse energy and clamps to 31.9 V, ensuring MCU reset circuitry remains functional during 35 V/100 ms load dump events. |
| Telecom Ethernet PHY Port Protection | Consumer Appliance Motor Drive Power Stage |
Use Scenario: Shielding 10/100BASE-TX Ethernet PHY differential pairs from ESD (IEC 61000-4-2 ±8 kV contact) and induced surges on PoE-enabled ports. IC Role / Device Role / Timing Role: Unidirectional TVS on each PHY power rail (VDDIO, AVDD), not signal lines - used for supply rail stabilization adjacent to magnetics. Use Value: Sub-1 µA leakage at 17.8 V prevents bias current disruption in precision PHY reference circuits; fast response avoids data corruption during ESD events. |
Use Scenario: Suppressing flyback voltage spikes generated by brushed DC motor commutation in washing machine or HVAC blower control boards. IC Role / Device Role / Timing Role: Parallel-connected TVS across motor terminals or H-bridge supply rail to clamp inductive energy during PWM turn-off. Use Value: 31.9 V clamping voltage limits MOSFET drain-source stress below 40 V rating, eliminating need for oversized 60 V FETs and reducing BOM cost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ22A | Same DO-214AA (SMB) package; 22 V nominal VBR; 600 W PPK (vs. 1500 W); 35.5 V VC @ 17 A | Limited to lower-energy transients (e.g., ESD-only); unsuitable for ISO 7637-2 Pulse 1/2b where 1500 W rating is required | Select SMBJ22A only if space constraints prohibit DO-214AB or surge energy is confirmed ≤600 W |
| 1.5KE22A | Through-hole DO-15 package; identical 19.8–24.2 V VBR and 31.9 V VC; same 1500 W rating but higher RθJA (~65 °C/W) | Requires wave soldering or hand assembly; incompatible with fully SMT production; less suitable for high-density layouts | Choose 1.5KE22A only for legacy through-hole designs or prototyping where reflow compatibility is not required |
Compared with SMBJ22A and 1.5KE22A, the 1.5SMC22 delivers superior surge robustness in surface-mount form - enabling compact, automated manufacturing while maintaining full ISO 7637-2 compliance and thermal performance margin via its 50 °C/W RθJA.
Availability
1.5SMC22 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, telecom Ethernet power rails, and appliance motor drive systems requiring stable component supply and long-term lifecycle assurance.
Supply support for 1.5SMC22 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 series was engineered specifically for high-energy transient suppression in surface-mount automotive and industrial applications - balancing clamping voltage, surge rating, and manufacturability in the DO-214AB package.
FAQ
What is the polarity configuration of the 1.5SMC22?
The 1.5SMC22 is a unidirectional TVS diode, with cathode band marking indicating the terminal that conducts during reverse-biased overvoltage events. It blocks forward current up to ~3.5 V and clamps reverse transients above its 19.8–24.2 V breakdown range. This configuration is optimized for DC power rail protection where polarity is fixed and forward conduction must be limited.
Does the 1.5SMC22 meet automotive transient standards?
Yes, the 1.5SMC22 meets ISO 7637-2 Pulse 1 (inductive switch-off), Pulse 2a (sudden load removal), Pulse 2b (supply interruption), Pulse 3a (capacitive coupling), and Pulse 3b (line impedance coupling). Its 1500 W peak pulse rating and 31.9 V clamping voltage ensure compliance with these waveforms when properly mounted on adequate copper area.
What is the maximum leakage current of the 1.5SMC22 at its working voltage?
The 1.5SMC22 exhibits ≤1 µA maximum reverse leakage current (IR) at its 17.8 V working stand-off voltage (VWM). This ultra-low leakage preserves signal integrity in high-impedance monitoring circuits and minimizes standby power loss in battery-backed systems.
Can the 1.5SMC22 be used in bidirectional applications?
No - the 1.5SMC22 is unidirectional only. For bidirectional transient suppression (e.g., AC lines or differential signals), TSC offers the 1.5SMC22C or 1.5SMC22CA variants, which feature symmetrical breakdown in both directions and use different marking codes and electrical test conditions.
What is the thermal resistance and how does it affect layout design for the 1.5SMC22?
The 1.5SMC22 has a junction-to-ambient thermal resistance (RθJA) of 50 °C/W. To maintain TJ ≤150 °C under 6.5 W steady-state dissipation, PCB copper area must be sufficient to dissipate heat - typically achieved using ≥100 mm² of 2 oz copper connected to both terminals, per TSC recommended pad layout for DO-214AB.
1.5SMC22 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):
- 17.8V
- Voltage - Breakdown (Min):
- 19.8V
- Voltage - Clamping (Max) @ Ipp:
- 31.9V
- Current - Peak Pulse (10/1000µs):
- 49A
- 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)
1.5SMC22 FAQ
1.How can I place an order for 1.5SMC22 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC22 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 1.5SMC22 reliable?
The price and inventory of 1.5SMC22 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC22 is usually 5 days.
3.What payment methods are accepted for 1.5SMC22?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC22 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC22?
1.5SMC22 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC22 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 1.5SMC22?
For technical support, including 1.5SMC22 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC22 requirements.
6.How does Aetrix verify that 1.5SMC22 is sourced from the original manufacturer or authorized distributors?
All 1.5SMC22 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 1.5SMC22 meets industry standards.
7.What is the process for return or replacement of 1.5SMC22?
All 1.5SMC22 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC22, 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 1.5SMC22 part is unused and in its original packaging.
Return procedure for 1.5SMC22:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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