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Taiwan Semiconductor Corporation 1.5SMC33CA
- Part No.:
- 1.5SMC33CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC33CA.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,350
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Product details
Overview
1.5SMC33CA from Taiwan Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust ESD and surge protection in DC power rails and signal lines. It features a 33V breakdown voltage (min 31.4V, max 34.7V), 1500W peak pulse power rating, 28.2V working stand-off voltage, <1μA leakage at VWM, and clamps to ≤45.7V at 34A peak impulse current. It is used in telecom interface protection and industrial I/O circuits requiring ISO 7637-2 compliance.
For engineers reviewing the 1.5SMC33CA datasheet, 1.5SMC33CA pinout, 1.5SMC33CA application, or 1.5SMC33CA equivalent, key selection criteria include bidirectional clamping capability, DO-214AB package compatibility, sub-1ps response time, thermal resistance (RθJC = 15°C/W), and suitability for automotive load-dump and ESD immunity designs.
Technical Context
This bidirectional TVS operates symmetrically in both polarities, with identical electrical characteristics forward and reverse - confirmed by manufacturer specification stating "Electrical characteristics apply in both directions" for CA-suffix parts. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1μA at 28.2V), while the DO-214AB package supports automated placement and meets JESD201 Class 2 whisker resistance.
The device delivers 1500W peak pulse power per 1ms 10/1000μs waveform (per Fig.5), derating linearly above 25°C ambient (RθJA = 50°C/W). It meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements - critical for automotive and industrial equipment subjected to inductive switching transients and battery disconnect events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 31.4V / 34.7V - defines guaranteed clamping onset range; ensures reliable turn-on before downstream IC damage thresholds. |
| VWM | 28.2V - maximum continuous DC or RMS voltage the device blocks without significant leakage; sets system operating margin. |
| IPPM | 34A - peak surge current it safely shunts during 10/1000μs transient; determines minimum trace width and PCB layout robustness. |
| VC@IPPM | ≤45.7V - maximum clamped voltage under rated surge; directly limits stress on protected ICs (e.g., RS-485 transceivers). |
| PPK | 1500W - peak pulse power handling per 1ms pulse; enables protection against high-energy load dump and lightning-induced surges. |
| TJ max | +150°C - maximum junction temperature; allows operation in under-hood automotive or enclosed industrial enclosures. |
| RθJC | 15°C/W - low junction-to-case thermal resistance; supports effective heat transfer to copper pour or heatsink when mounted on ≥1 oz Cu. |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, bidirectional configuration with cathode band omitted (symmetrical terminals). Case meets UL 94V-0; matte tin-plated leads comply with J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional surge conduction path | No polarity marking required; either terminal serves as input/output - simplifies PCB layout and eliminates orientation errors in automated assembly. |
Key Features
| Feature | Design Value |
|---|---|
| Fast response time | <1.0 ps - enables suppression before ESD or fast transients propagate into sensitive circuitry (e.g., USB PHY, CAN FD nodes). |
| ISO 7637-2 compliance | Certified for Pulse 1/2a/2b/3a/3b - validates suitability for automotive power line protection without additional external filtering. |
| Moisture sensitivity level | MSL Level 1 (per J-STD-020) - allows unlimited floor life; no baking required prior to reflow, reducing manufacturing overhead. |
| RoHS & halogen-free | Compliant per RoHS Directive and IEC 61249-2-21 - meets global environmental regulations and enables use in green-certified end equipment. |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module |
|---|---|
Use Scenario: Protecting 24V digital input channels in programmable logic controllers from inductive kickback and field wiring surges. 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 pulses per IEC 61000-4-5 and maintains <1μA leakage at 24V nominal, ensuring long-term reliability and low standby power impact. |
Use Scenario: Safeguarding LIN bus transceivers and sensor supply lines in body control modules exposed to battery disconnection and load dump events. IC Role / Device Role / Timing Role: Placed across VCC and GND near each LIN node to clamp ISO 7637-2 Pulse 5a (load dump) to ≤45.7V. Use Value: Clamping voltage of 45.7V at 34A ensures protected ICs remain below absolute maximum ratings even during worst-case 35V/100ms load dump events. |
| Telecom Ethernet Port Protection | Smart Meter Power Supply Input |
Use Scenario: Secondary-level surge protection on 48V PoE-powered Ethernet ports in network switches and IP cameras. IC Role / Device Role / Timing Role: Paired with primary GDT or polymer PTC to absorb residual energy after first-stage clipping; placed on DC bias line feeding PHY. Use Value: 1500W rating and 34A IPPM allow absorption of residual 10/1000μs surges that bypass upstream protection, preventing latch-up in Ethernet PHYs. |
Use Scenario: Input rail protection for 3-phase smart meters operating from 100–240VAC mains with rectified DC bus. IC Role / Device Role / Timing Role: Mounted across bulk capacitor input to suppress differential-mode surges induced by nearby lightning strikes or grid switching. Use Value: Bidirectional operation protects both positive and negative half-cycles of rectified AC; 28.2V VWM accommodates ripple while blocking normal operation voltages up to ~40VDC. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33CA (Bourns) | Same DO-214AA package (smaller than DO-214AB); 600W PPK, lower IPPM (17.5A), higher VC (53.3V) | Limited to lower-energy transients; insufficient for ISO 7637-2 Pulse 5a or high-current load dump. | Select only where space constraints prohibit DO-214AB and surge threat level is limited to IEC 61000-4-2/4-4. |
| SMCJ33CA (Littelfuse) | Identical DO-214AB package and 1500W rating; VBR min/max = 31.4–34.7V, VC = 45.7V - matches 1.5SMC33CA exactly per datasheet. | Drop-in functional and mechanical replacement; validated for same automotive and industrial standards. | Preferred where dual-sourcing or second-source qualification is required without redesign or requalification. |
Compared with SMBJ33CA and SMCJ33CA, the 1.5SMC33CA offers identical clamping performance and package footprint to SMCJ33CA but superior surge capacity versus SMBJ33CA - making it suitable for high-reliability 24V/48V systems where full ISO 7637-2 compliance is mandatory.
Availability
1.5SMC33CA is available at Aetrix Electronics and suitable for industrial PLC I/O protection, automotive body control modules, and telecom Ethernet port hardening requiring stable component supply and long-lifecycle support.
Supply support for 1.5SMC33CA 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 distribution and AEC-Q200 qualified product lines.
The 1.5SMCxxCA series is part of TSC's high-power surface-mount TVS platform, engineered specifically for automotive, industrial, and telecom applications demanding ISO 7637-2 compliance, MSL Level 1 handling, and robust bidirectional surge immunity.
FAQ
What is the polarity configuration of the 1.5SMC33CA?
The 1.5SMC33CA is a bidirectional TVS diode with symmetrical anode/cathode terminals - no polarity marking is present on the DO-214AB package. This enables installation in either orientation on PCBs, eliminating assembly errors and simplifying layout for differential or AC-coupled protection schemes. The device clamps identically for positive and negative transients, as confirmed in the manufacturer's datasheet section "Devices for Bipolar Applications".
Does the 1.5SMC33CA meet automotive surge immunity standards?
Yes, the 1.5SMC33CA meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements - explicitly stated in its official datasheet. It is widely deployed in automotive body control modules and infotainment power supplies for protection against load dump, inductive switching, and battery reversal transients. Its 1500W peak power rating and 45.7V clamping voltage ensure compliance with Pulse 5a (load dump) when used with appropriate upstream impedance.
What is the maximum allowable mounting temperature for reflow soldering of the 1.5SMC33CA?
The 1.5SMC33CA is rated for standard lead-free reflow profiles per J-STD-020. Its moisture sensitivity level is MSL Level 1, meaning it can withstand peak reflow temperatures up to 260°C for ≤60 seconds without popcorn cracking or delamination. The device uses matte tin-plated leads compliant with J-STD-002, ensuring reliable wetting and joint integrity during both SnPb and Pb-free processes.
How does the 1.5SMC33CA compare to unidirectional TVS diodes like 1.5SMC33A?
The 1.5SMC33CA differs from the unidirectional 1.5SMC33A by supporting symmetrical clamping in both directions - essential for protecting AC-coupled lines, differential buses (e.g., RS-485), or DC rails where reverse polarity faults may occur. While both share identical VBR, VWM, and VC specs, only the CA version guarantees performance under reverse-biased surge conditions, as verified in the "Devices for Bipolar Applications" section of the datasheet.
Is thermal derating required for the 1.5SMC33CA in high-ambient environments?
Yes, the 1.5SMC33CA must be thermally derated above 25°C ambient per its Pulse Derating Curve (Fig.2). With RθJA = 50°C/W and RθJC = 15°C/W, its usable peak power drops to ~1125W at 50°C ambient and ~750W at 75°C. Effective PCB copper pour (≥1 in² 2 oz Cu) or thermal vias to inner ground planes are recommended to maintain clamping performance in enclosed industrial enclosures or under-hood automotive locations.
1.5SMC33CA 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):
- 28.2V
- Voltage - Breakdown (Min):
- 31.4V
- Voltage - Clamping (Max) @ Ipp:
- 45.7V
- Current - Peak Pulse (10/1000µs):
- 34A
- 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)
1.5SMC33CA FAQ
1.How can I place an order for 1.5SMC33CA through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC33CA 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 1.5SMC33CA reliable?
The price and inventory of 1.5SMC33CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC33CA is usually 5 days.
3.What payment methods are accepted for 1.5SMC33CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC33CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC33CA?
1.5SMC33CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC33CA 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 1.5SMC33CA?
For technical support, including 1.5SMC33CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC33CA requirements.
6.How does Aetrix verify that 1.5SMC33CA is sourced from the original manufacturer or authorized distributors?
All 1.5SMC33CA 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 1.5SMC33CA meets industry standards.
7.What is the process for return or replacement of 1.5SMC33CA?
All 1.5SMC33CA units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC33CA, 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 1.5SMC33CA part is unused and in its original packaging.
Return procedure for 1.5SMC33CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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