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Taiwan Semiconductor Corporation 1.5SMC18CAH
- Part No.:
- 1.5SMC18CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC18CAH.pdf
- Description:
- TVS DIODE 15.3VWM 25.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,447
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Product details
Overview
1.5SMC18CAH from Taiwan Semiconductor is a bidirectional 1500W surface-mount transient voltage suppressor (TVS) in DO-214AB (SMC) package, with breakdown voltage 17.1–18.9 V at 1 mA test current, clamping voltage 25.5 V at 60 A peak impulse current, and working stand-off voltage 15.3 V. It protects automotive-grade power rails and data lines against ESD, lightning-induced surges, and load-switching transients.
For engineers reviewing the 1.5SMC18CAH datasheet, 1.5SMC18CAH pinout, 1.5SMC18CAH application, or 1.5SMC18CAH equivalent, this device serves as a high-energy, AEC-Q101-qualified TVS for bidirectional DC bus protection where fast response (<1 ps), low leakage (<1 µA at 15.3 V), and ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance are required.
Technical Context
This bidirectional TVS operates symmetrically in both polarities, enabling robust protection of AC-coupled interfaces and floating buses without polarity constraints. Its glass-passivated junction ensures stable breakdown characteristics and low leakage across temperature, while the DO-214AB thermal design supports 15 °C/W junction-to-case resistance and 50 °C/W junction-to-ambient resistance.
The device meets stringent automotive surge immunity standards including ISO 7637-2 Pulse 1 (inductive load dump suppression), Pulse 2a/2b (battery connection interruption), and Pulse 3a/3b (capacitive coupling transients). Its 1500 W peak pulse power rating is defined at 10/1000 µs waveform per REA standard, with derating above 25 °C ambient per published curve.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR min/max | 17.1 V / 18.9 V at 1 mA - defines reliable turn-on threshold for bidirectional overvoltage clamping |
| VWM | 15.3 V - maximum continuous DC or RMS voltage the device blocks without conduction |
| VC @ IPPM | 25.5 V at 60 A - clamped voltage during 10/1000 µs surge, limiting downstream IC stress |
| PPK | 1500 W - peak surge energy absorption capability under standardized transient conditions |
| IR @ VWM | <1 µA - ultra-low leakage preserves signal integrity and battery life in always-on systems |
| TJ max | +150 °C - enables operation in under-hood automotive environments and industrial enclosures |
| Package | DO-214AB (SMC) - industry-standard surface-mount outline with 0.210 g mass and UL 94V-0 molding |
Pinout & Package
DO-214AB (SMC) package: molded plastic case with two coplanar matte tin-plated leads; cathode band omitted (bidirectional symmetry); polarity not applicable; weight ≈ 0.210 g; moisture sensitivity level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional surge conduction path | Either terminal serves as input/output - no polarity dependency; connects across protected line and ground or differential pair |
| Case | Non-electrical mechanical interface | No internal connection; provides thermal path to PCB copper and mechanical mounting stability |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics use including engine control, body modules, and ADAS sensor interfaces |
| ISO 7637-2 compliant | Withstands Pulse 1 (−150 V/50 Ω), Pulse 2a (+100 V), Pulse 2b (−100 V), Pulse 3a/3b (±200 V) without degradation |
| Fast response time | <1.0 ps - limits voltage overshoot before clamping engages, protecting sub-ns-sensitive receivers |
| Glass passivated junction | Ensures long-term parameter stability and low IR drift over temperature and lifetime |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for green manufacturing |
Applications
| Automotive Power Distribution | Industrial CAN Bus Protection |
|---|---|
Use Scenario: 12 V battery rail in vehicle body control module exposed to load-dump transients up to +120 V. IC Role / Device Role / Timing Role: Bidirectional TVS placed between VBAT and chassis ground to clamp positive/negative spikes. Use Value: Limits rail voltage to ≤25.5 V during 1500 W surges, preventing damage to MCU, LIN transceivers, and power switches. |
Use Scenario: CAN_H/CAN_L differential pair in factory automation node subjected to ESD and inductive switching noise. IC Role / Device Role / Timing Role: Two 1.5SMC18CAH devices deployed in common-mode configuration across CAN_H–GND and CAN_L–GND. Use Value: Maintains signal integrity by clamping transients before they exceed ±30 V, preserving ISO 11898-2 compliance. |
| Telecom DC Power Input | Smart Meter Voltage Monitoring |
Use Scenario: 24 V DC input stage of VoIP gateway encountering lightning-induced surges on PoE-derived supply. IC Role / Device Role / Timing Role: Primary overvoltage protector upstream of DC/DC converter and hot-swap controller. Use Value: Absorbs 10/1000 µs surges up to 1500 W without latch-up, enabling single-stage protection without series impedance. |
Use Scenario: Precision voltage divider input of electricity meter IC exposed to grid switching transients. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA) TVS shunting transient energy away from 16-bit ADC reference path. Use Value: Prevents measurement offset drift caused by microamp-level leakage currents during standby operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18CA | Same 18 V nominal VBR, but 600 W PPK rating and SMB package (smaller footprint, higher RθJA) | Limited to lower-energy surges; unsuitable for ISO 7637-2 Pulse 1 or sustained load-dump events | Select when board space is constrained and surge threat level is limited to IEC 61000-4-2/5 only |
| 1.5KE18CA | Through-hole DO-201 package, identical 1500 W rating and VBR/VC specs, but slower response (~1 ns) and no AEC-Q101 qualification | Not suitable for automated SMT assembly or automotive under-hood environments requiring vibration resistance | Select for legacy through-hole designs or non-automotive industrial equipment where AEC-Q101 is not mandated |
Compared with SMBJ18CA and 1.5KE18CA, the 1.5SMC18CAH delivers full AEC-Q101 qualification, DO-214AB thermal performance, and sub-picosecond response-making it the only option among the three validated for automotive power rail protection per ISO 7637-2.
Availability
1.5SMC18CAH is available at Aetrix Electronics and suitable for automotive electronics, industrial CAN networks, telecom power inputs, and smart metering systems requiring stable component supply and long-term lifecycle support.
Supply support for 1.5SMC18CAH 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, MOSFETs, and power management components.
The 1.5SMCxxCAH series is part of TSC's AEC-Q101-qualified TVS portfolio designed specifically for high-reliability automotive and industrial surge protection, emphasizing low clamping voltage, fast response, and robust thermal performance in surface-mount packages.
FAQ
What does the "CAH" suffix indicate in 1.5SMC18CAH?
The "CAH" suffix denotes a bidirectional configuration with A-grade tolerance (±5% VBR) and halogen-free construction. Unlike unidirectional "H" variants, 1.5SMC18CAH conducts symmetrically in both directions, making it ideal for AC-coupled or floating-bus protection. It shares the same DO-214AB package and 1500 W rating as its unidirectional counterparts but omits cathode marking due to polarity independence.
How does 1.5SMC18CAH meet ISO 7637-2 Pulse 1 requirements?
1.5SMC18CAH clamps to 25.5 V at 60 A (10/1000 µs), well below the ±120 V peak of ISO 7637-2 Pulse 1 (simulating alternator load dump). Its 1500 W rating and low dynamic impedance ensure it absorbs the full 1500 W surge energy without failure. Test data confirms compliance across −40 °C to +125 °C, satisfying automotive grade 3 operating range requirements.
Is 1.5SMC18CAH compatible with lead-free reflow soldering profiles?
Yes, 1.5SMC18CAH is qualified for lead-free reflow per JEDEC J-STD-020, with peak temperature tolerance up to 260 °C for 10 seconds. Its matte tin-plated leads comply with J-STD-002 for solderability, and the UL 94V-0 molding compound withstands repeated thermal cycling without delamination or parameter shift.
What is the maximum steady-state power dissipation for 1.5SMC18CAH?
The steady-state power dissipation (PD) of 1.5SMC18CAH is 6.5 W at 25 °C ambient, derating linearly to zero at +150 °C junction temperature. This rating applies only to continuous DC or low-frequency AC stress-not transient surges-and assumes adequate PCB copper area for heat spreading per DO-214AB thermal guidelines.
Can 1.5SMC18CAH be used in parallel for higher surge current handling?
No-parallel connection of 1.5SMC18CAH devices is not recommended due to mismatched dynamic impedance causing current imbalance. For higher IPPM, select a single higher-voltage-rated device (e.g., 1.5SMC24CAH) or consult TSC's application note AN-107 for stacked TVS configurations with balancing resistors.
1.5SMC18CAH 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):
- 15.3V
- Voltage - Breakdown (Min):
- 17.1V
- Voltage - Clamping (Max) @ Ipp:
- 25.5V
- Current - Peak Pulse (10/1000µs):
- 60A
- 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)
1.5SMC18CAH FAQ
1.How can I place an order for 1.5SMC18CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC18CAH 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 1.5SMC18CAH reliable?
The price and inventory of 1.5SMC18CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC18CAH is usually 5 days.
3.What payment methods are accepted for 1.5SMC18CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC18CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC18CAH?
1.5SMC18CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC18CAH 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 1.5SMC18CAH?
For technical support, including 1.5SMC18CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC18CAH requirements.
6.How does Aetrix verify that 1.5SMC18CAH is sourced from the original manufacturer or authorized distributors?
All 1.5SMC18CAH 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 1.5SMC18CAH meets industry standards.
7.What is the process for return or replacement of 1.5SMC18CAH?
All 1.5SMC18CAH units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC18CAH, 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 1.5SMC18CAH part is unused and in its original packaging.
Return procedure for 1.5SMC18CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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