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Taiwan Semiconductor Corporation 1.5SMC18CH
- Part No.:
- 1.5SMC18CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC18CH.pdf
- Description:
- 1500W, 18V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:4,645
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Product details
Overview
1.5SMC18CH from Taiwan Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, rated for 1500W peak pulse power, 18V breakdown voltage (min 16.2V, max 19.8V), and clamps transients to ≤25.5V at 60A peak impulse current. It protects automotive and industrial power rails against ESD, load dump, and ISO 7637-2 Pulse 1/2a/2b/3a/3b surges.
For engineers reviewing the 1.5SMC18CH datasheet, 1.5SMC18CH pinout, 1.5SMC18CH application, or 1.5SMC18CH equivalent, this device delivers AEC-Q101 qualification, <1.0ps response time, <1μA leakage above 15.3V, and bidirectional clamping capability in a moisture-sensitive level 1, RoHS- and halogen-free SMC package.
Technical Context
This TVS operates as a voltage-clamped shunt protector: when transient voltage exceeds its breakdown threshold (VBR = 16.2–19.8V @ 1mA), it avalanches rapidly to divert surge current away from downstream circuitry. Its bidirectional configuration enables symmetric protection on AC lines or floating buses without polarity dependency.
Thermal performance is defined by RθJA = 50°C/W and RθJC = 15°C/W, supporting sustained operation up to TJ = +150°C. The glass-passivated junction ensures stable VBR temperature coefficient (0.088%/°C) and low leakage (<1μA @ VWM = 15.3V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 16.2V / 19.8V @ 1mA - defines precise avalanche onset window for reliable overvoltage triggering |
| VWM | 15.3V - maximum continuous working voltage; must exceed normal system operating voltage to prevent conduction |
| VC @ IPPM | 25.5V @ 60A - clamping voltage during 10/1000μs surge; determines protected IC's maximum stress exposure |
| PPK | 1500W - peak pulse power handling per single 1ms transient; supports high-energy automotive load-dump events |
| IR @ VWM | <1μA - ultra-low leakage ensures minimal standby power loss and signal integrity in high-impedance circuits |
| TJ max | +150°C - junction temperature limit enabling use in under-hood automotive environments and industrial enclosures |
| Package | DO-214AB (SMC) - industry-standard surface-mount outline with 0.210g mass, UL 94V-0 molding, and matte tin-plated leads |
Pinout & Package
DO-214AB (SMC) package: molded plastic case with two coplanar gull-wing leads; cathode band marking denotes polarity for unidirectional variants only - 1.5SMC18CH is bidirectional and has no polarity marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional avalanche junction | Either terminal serves as input/output; identical clamping behavior in both directions - eliminates PCB layout polarity constraints |
| Case (body) | Non-conductive thermal path | Plastic housing provides electrical isolation while enabling heat dissipation via PCB copper area under body |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock per JESD22 standards |
| ISO 7637-2 compliance | Withstands Pulse 1 (inductive load disconnect), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) without degradation |
| Fast response time | <1.0ps - limits voltage overshoot before clamping engages, critical for protecting fast-edge logic and CAN transceivers |
| Glass-passivated junction | Ensures long-term parameter stability and resistance to environmental contamination in harsh industrial settings |
| Moisture sensitivity level 1 | No floor-life limitation or bake requirement before reflow - simplifies SMT line integration and inventory management |
Applications
| Automotive Power Distribution | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting 12V battery-fed ECUs, lighting modules, and body control units from load dump and alternator transients. IC Role / Device Role / Timing Role: Shunt clamping element placed between power rail and ground, activated within picoseconds of overvoltage event. Use Value: Limits rail voltage to ≤25.5V during 1500W surges, preventing damage to 36V-rated DC-DC converters and microcontrollers. |
Use Scenario: Safeguarding analog input channels (4–20mA, 0–10V) and digital I/O on programmable logic controllers exposed to field wiring surges. IC Role / Device Role / Timing Role: Bidirectional voltage clamp across differential signal pairs or supply-to-ground paths. Use Value: Maintains signal integrity by suppressing ±25.5V clamping excursions while adding <1pF parasitic capacitance - no bandwidth degradation. |
| Telecom Line Interface | Consumer Appliance Motor Control |
|
Use Scenario: Shielding Ethernet PHYs, RS-485 transceivers, and DSL line drivers from ESD and lightning-induced surges on external ports. IC Role / Device Role / Timing Role: Primary front-end protection device mounted at connector entry point, ahead of secondary filtering. Use Value: Withstands ±15kV contact ESD (IEC 61000-4-2) and clamps induced transients to safe levels without latch-up or parametric shift. |
Use Scenario: Suppressing commutation spikes from brushed DC motors and relay coils in washing machines, HVAC blowers, and power tools. IC Role / Device Role / Timing Role: Across-the-rail snubber connected directly across motor terminals or coil windings. Use Value: Absorbs 1500W inductive kickback energy without failure, extending MOSFET driver lifetime and eliminating need for external RC snubbers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18CA (Bourns) | Same DO-214AA (SMB) package; lower PPK = 600W; VC = 29.2V @ 20.5A | Not suitable for ISO 7637-2 Pulse 5a (load dump); limited to lower-energy surges | Select when cost and board space are prioritized over automotive-grade surge margin |
| SMCJ18CA (Littelfuse) | Identical DO-214AB (SMC) package and 1500W rating; VC = 28.5V @ 52.6A; not AEC-Q101 qualified | Lacks automotive qualification documentation and extended temperature validation | Prefer for industrial-only designs where AEC-Q101 is not mandated |
Compared with SMBJ18CA and SMCJ18CA, the 1.5SMC18CH offers superior automotive compliance (AEC-Q101 + ISO 7637-2), tighter VC (25.5V vs. ≥28.5V), and verified moisture sensitivity level 1 - making it optimal for high-reliability vehicle electronics requiring zero reflow risk and full surge immunity.
Availability
1.5SMC18CH is available at Aetrix Electronics and suitable for automotive power distribution, industrial PLC I/O protection, telecom line interface, and consumer appliance motor control requiring stable component supply and full AEC-Q101 traceability.
Supply support for 1.5SMC18CH 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 manufacturing and quality certifications including IATF 16949.
The 1.5SMCxxCH series was engineered specifically for AEC-Q101-compliant automotive transient suppression, targeting robustness against load dump, ESD, and ISO 7637-2 pulses in engine control, body electronics, and infotainment systems.
FAQ
What does the "CH" suffix indicate in 1.5SMC18CH?
The "CH" suffix designates a bidirectional TVS diode variant in the 1.5SMC family. Unlike unidirectional "H" parts, 1.5SMC18CH provides symmetrical clamping for both positive and negative transients - essential for AC-coupled lines, differential buses, or floating grounds where polarity is undefined. This eliminates the need for orientation-aware placement during SMT assembly.
Is 1.5SMC18CH compatible with lead-free reflow profiles?
Yes, 1.5SMC18CH supports standard JEDEC J-STD-020 lead-free reflow profiles, including peak temperatures up to 260°C. Its moisture sensitivity level 1 rating means it can be used directly from dry pack without baking, and its matte tin-plated leads meet solderability requirements per J-STD-002 - ensuring reliable joint formation in automated assembly lines.
How does 1.5SMC18CH differ from the unidirectional 1.5SMC18H?
The 1.5SMC18CH is bidirectional with identical clamping characteristics in both directions, while 1.5SMC18H is unidirectional and conducts only during reverse-bias overvoltage. Key differences include: 1.5SMC18CH has no cathode band marking, supports AC/float applications, and exhibits matched VBR and VC in either polarity - whereas 1.5SMC18H requires correct anode/cathode orientation and cannot protect against forward surges.
Can 1.5SMC18CH be used in place of 1.5SMC18AH?
No - 1.5SMC18AH is a unidirectional part with tighter VBR tolerance (17.1–18.9V vs. 16.2–19.8V for 1.5SMC18CH) and slightly lower clamping voltage (25.5V vs. 26.5V). Substituting 1.5SMC18CH for 1.5SMC18AH introduces bidirectional conduction and wider VBR spread, which may compromise precision overvoltage thresholds in sensitive analog circuits unless explicitly designed for symmetry.
What is the maximum allowable printed circuit board copper area for thermal relief with 1.5SMC18CH?
Taiwan Semiconductor specifies RθJA = 50°C/W with standard JEDEC 2S2P test board (2 oz copper, 2-layer, 1-inch² pad per terminal). Increasing copper area beyond this - especially using internal ground/power planes connected to both terminals - can reduce RθJA to ~35°C/W, enabling higher average power handling. However, thermal simulation is recommended for designs exceeding 1W steady-state dissipation.
1.5SMC18CH 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:
- -
- Bidirectional Channels:
- 1
- 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
1.5SMC18CH FAQ
1.How can I place an order for 1.5SMC18CH through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC18CH 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 1.5SMC18CH reliable?
The price and inventory of 1.5SMC18CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC18CH is usually 5 days.
3.What payment methods are accepted for 1.5SMC18CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC18CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC18CH?
1.5SMC18CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC18CH 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 1.5SMC18CH?
For technical support, including 1.5SMC18CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC18CH requirements.
6.How does Aetrix verify that 1.5SMC18CH is sourced from the original manufacturer or authorized distributors?
All 1.5SMC18CH 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 1.5SMC18CH meets industry standards.
7.What is the process for return or replacement of 1.5SMC18CH?
All 1.5SMC18CH units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC18CH, 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 1.5SMC18CH part is unused and in its original packaging.
Return procedure for 1.5SMC18CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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