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Taiwan Semiconductor Corporation 1.5SMC30CA
- Part No.:
- 1.5SMC30CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC30CA.pdf
- Description:
- TVS DIODE 25.6VWM 41.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,999
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Product details
Overview
1.5SMC30CA from Taiwan Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection in DC power rails and signal lines. It features a 30V nominal breakdown voltage (28.5–31.5V), 1500W peak pulse power rating, 41.4V maximum clamping voltage at 38A peak current, and DO-214AB (SMC) package. It is used to protect Ethernet PHYs, USB ports, and industrial I/O interfaces against ESD, lightning-induced surges, and load-switching transients.
For engineers reviewing the 1.5SMC30CA datasheet, 1.5SMC30CA pinout, 1.5SMC30CA application, or 1.5SMC30CA equivalent, key selection criteria include bidirectional clamping capability, sub-1ps response time, <1µA leakage at 25.6V working stand-off voltage, compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b, and thermal performance with RθJC = 15°C/W.
Technical Context
The 1.5SMC30CA employs a glass-passivated silicon junction optimized for fast avalanche response and stable clamping under repetitive surge conditions. Its bidirectional configuration enables symmetrical protection without polarity sensitivity, supporting both positive and negative transients on the same line.
It operates within a -55°C to +150°C junction temperature range, with thermal resistance of 15°C/W (junction-to-case) and 50°C/W (junction-to-ambient), enabling reliable operation in high-power-density industrial and automotive environments where board-level heat dissipation is constrained.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR min/max | 28.5 V / 31.5 V - Ensures consistent avalanche initiation across manufacturing lot and temperature; guarantees clamping begins no later than 31.5V under 1mA test current. |
| VWM | 25.6 V - Maximum continuous DC or RMS voltage the device blocks without significant leakage; sets safe operating margin below breakdown. |
| IPPM | 38 A - Peak surge current it safely shunts during a 10/1000µs waveform; defines minimum system-level surge immunity level. |
| VC@IPPM | 41.4 V - Clamped voltage seen by protected circuit during full-rated surge; determines maximum stress on downstream ICs. |
| PPK | 1500 W - Peak pulse power handling per single 1ms event; supports high-energy transients like ISO 7637-2 Pulse 5a. |
| IR@VWM | <1 µA - Ultra-low leakage ensures minimal standby power loss and avoids false triggering in high-impedance sensing circuits. |
| TJ max | +150°C - Enables use in under-hood automotive modules, motor drives, and enclosed industrial controllers without derating. |
Pinout & Package
Package: DO-214AB (SMC) - Surface-mount, molded plastic case with matte tin-plated leads; meets UL 94V-0 flammability and JESD201 Class 2 whisker resistance; polarity indicated by cathode band (bidirectional operation uses symmetric marking).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional avalanche junction terminals | No functional polarity - either terminal serves as anode or cathode depending on transient polarity; enables single-device protection of AC-coupled or floating lines. |
| Case (exposed metal slug) | Thermal conduction path | Provides low-thermal-resistance path to PCB copper pour; requires ≥25 mm² thermal pad for rated 1500W pulse handling. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures long-term stability of VBR and leakage under humidity and thermal cycling; eliminates risk of junction corrosion in harsh environments. |
| <1 ps response time | Clamps transients before they propagate beyond the TVS location - critical for protecting high-speed interfaces like RS-485 or CAN FD physical layers. |
| ISO 7637-2 compliant | Validated for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling), meeting automotive OEM requirements without additional filtering. |
| Moisture sensitivity level 1 | Zero bake requirement before reflow - compatible with standard SMT assembly lines without special handling or dry-packaging logistics. |
| Halogen-free & RoHS | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU - supports green manufacturing and export compliance for global electronics programs. |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Protecting 24V digital input channels in programmable logic controllers from inductive kickback and field-wiring ESD. IC Role / Device Role / Timing Role: Bidirectional TVS placed between input terminal and ground, clamping transients before they reach optocoupler or microcontroller GPIO. Use Value: Withstands repeated 1500W surges while maintaining VC ≤41.4V - keeps downstream 3.3V/5V logic ICs within absolute maximum ratings. |
Use Scenario: Safeguarding LIN bus transceivers and sensor supply lines in body control units exposed to battery load-dump events. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 12V rail and LIN signal line, referenced to chassis ground with low-inductance layout. Use Value: Meets ISO 7637-2 Pulse 5a (load dump) and Pulse 1 (inductive switch-off) - eliminates need for secondary Zener or RC snubbers. |
| Telecom Power Feeds | RS-485 Data Line Protection |
Use Scenario: Shielding 48V PoE-powered equipment front-ends from lightning-induced common-mode surges on DC input lines. IC Role / Device Role / Timing Role: Bidirectional TVS connected line-to-ground on primary DC input, coordinated with upstream fuse and common-mode choke. Use Value: 41.4V clamping at 38A ensures protected DC-DC converter ICs see <45V peak - well below 60V absolute max rating of most 48V-input regulators. |
Use Scenario: Protecting half-duplex RS-485 transceivers (e.g., SN65HVD72) on factory-floor networks subject to cable ESD and ground-bounce. IC Role / Device Role / Timing Role: Paired TVS devices (A/B lines to GND) providing differential and common-mode surge suppression. Use Value: Sub-1ps response prevents data corruption during 8kV contact ESD events - maintains >1 Mbps communication integrity without packet loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ30CA (Bourns) | Same DO-214AA package; 30V VBR, 600W PPK, 48.4V VC @ 12.3A - lower power rating and higher clamping voltage. | Limited to lower-energy transients (e.g., IEC 61000-4-2 ESD only); unsuitable for ISO 7637-2 Pulse 5a or high-current load dump. | Select when space-constrained layouts require smaller SMB package and surge energy is capped at ≤600W. |
| 1.5KE30CA (ON Semiconductor) | Through-hole DO-15 package; identical 30V VBR and 41.4V VC, but 1500W rating applies only at TA=25°C with heatsinking - derates faster above 70°C. | Requires manual or wave soldering; less suitable for automated SMT production and high-density boards. | Choose for legacy through-hole designs or prototyping where thermal mass of leadframe provides marginal advantage in short-pulse scenarios. |
Compared with SMBJ30CA and 1.5KE30CA, the 1.5SMC30CA delivers full 1500W surge capability in a surface-mount DO-214AB package with superior thermal resistance (RθJC = 15°C/W), making it optimal for high-reliability, high-volume SMT applications requiring automotive-grade transient immunity.
Availability
1.5SMC30CA is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and telecom infrastructure projects requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for 1.5SMC30CA 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 devices.
The 1.5SMC series was developed specifically for high-power, surface-mount transient suppression in automotive and industrial systems - emphasizing ruggedness, AEC-Q200 alignment, and compatibility with automated SMT assembly.
FAQ
What does the 'CA' suffix indicate in 1.5SMC30CA?
The 'CA' suffix in 1.5SMC30CA denotes a bidirectional configuration - meaning the device provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike unidirectional variants (e.g., 1.5SMC30A), the 1.5SMC30CA has no polarity marking and functions identically regardless of voltage polarity applied across its terminals, making it ideal for AC-coupled or floating signal lines.
How does 1.5SMC30CA differ from 1.5SMC30A?
The 1.5SMC30A is unidirectional with a defined cathode band and conducts only during reverse-bias surges, while the 1.5SMC30CA is bidirectional and clamps transients of either polarity. Their electrical specs are otherwise matched: same VBR (28.5–31.5V), VWM (25.6V), VC (41.4V), and PPK (1500W). Layout must reflect this - 1.5SMC30CA requires no orientation check during placement.
Is 1.5SMC30CA compliant with automotive transient standards?
Yes, the 1.5SMC30CA meets ISO 7637-2 requirements for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling), as verified in Taiwan Semiconductor's official characterization. Its 1500W peak power rating and 41.4V clamping voltage enable direct compliance in 12V and 24V automotive subsystems without supplemental protection components.
What is the maximum recommended PCB copper area for thermal relief with 1.5SMC30CA?
Taiwan Semiconductor specifies a minimum thermal pad area of 25 mm² (e.g., 5 mm × 5 mm) connected via ≥4 thermal vias (0.3 mm diameter) to an internal ground plane for sustained 1500W pulse handling. This achieves the rated RθJC = 15°C/W; reducing copper area increases junction temperature and may trigger premature thermal runaway during repetitive surges.
Can 1.5SMC30CA be used in parallel to increase surge current capacity?
No - paralleling multiple 1.5SMC30CA devices is not recommended due to mismatch in VBR tolerance (±5%) and dynamic impedance, causing uneven current sharing and potential single-device failure. For higher current handling, select a higher-rated part (e.g., 3.0SMC30CA) or verify layout-based current division with SPICE simulation and empirical testing.
1.5SMC30CA 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):
- 25.6V
- Voltage - Breakdown (Min):
- 28.5V
- Voltage - Clamping (Max) @ Ipp:
- 41.4V
- Current - Peak Pulse (10/1000µs):
- 38A
- 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)
1.5SMC30CA FAQ
1.How can I place an order for 1.5SMC30CA through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC30CA 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 1.5SMC30CA reliable?
The price and inventory of 1.5SMC30CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC30CA is usually 5 days.
3.What payment methods are accepted for 1.5SMC30CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC30CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC30CA?
1.5SMC30CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC30CA 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 1.5SMC30CA?
For technical support, including 1.5SMC30CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC30CA requirements.
6.How does Aetrix verify that 1.5SMC30CA is sourced from the original manufacturer or authorized distributors?
All 1.5SMC30CA 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 1.5SMC30CA meets industry standards.
7.What is the process for return or replacement of 1.5SMC30CA?
All 1.5SMC30CA units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC30CA, 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 1.5SMC30CA part is unused and in its original packaging.
Return procedure for 1.5SMC30CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC30CA Tags
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