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Taiwan Semiconductor Corporation 1.5SMC33CAH
- Part No.:
- 1.5SMC33CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC33CAH.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,149
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Product details
Overview
1.5SMC33CAH from Taiwan Semiconductor is a bidirectional 33V transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, rated for 1500W peak pulse power, 45.7V maximum clamping voltage at 34A, and 28.2V working stand-off voltage. It provides ESD and surge protection for automotive-grade power rails and data lines in industrial control systems.
For engineers reviewing the 1.5SMC33CAH datasheet, 1.5SMC33CAH pinout, 1.5SMC33CAH application, or 1.5SMC33CAH equivalent, key selection criteria include clamping voltage margin, unidirectional/bidirectional configuration, AEC-Q101 qualification, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, and thermal resistance (RθJC = 15°C/W).
Technical Context
The 1.5SMC33CAH is a glass-passivated, bipolar junction TVS diode designed for fast transient suppression with sub-1ps response time. Its bidirectional architecture enables symmetrical clamping across both polarities without external polarity management.
It operates within -55°C to +150°C junction temperature range, supports 1.0mA test current for breakdown verification, and maintains leakage current ≤1μA at 28.2V (VWM). Thermal performance is defined by RθJA = 50°C/W and RθJC = 15°C/W under standard mounting conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR Min/Max | 31.4V / 34.7V - Ensures reliable breakdown activation above system operating voltage with ±5% tolerance |
| VWM | 28.2V - Maximum continuous reverse standoff voltage before leakage exceeds 1μA |
| VC@IPPM | 45.7V at 34A - Clamping voltage limits downstream IC stress during 10/1000μs transients |
| PPK | 1500W - Peak pulse power handling per single 1ms waveform per Fig.5 |
| IPPM | 34A - Maximum non-repetitive surge current supported at VC = 45.7V |
| TJ Max | +150°C - Enables operation in under-hood automotive and high-temperature industrial environments |
| Configuration | Bidirectional - Provides symmetrical overvoltage protection without polarity dependency |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, matte tin-plated leads, polarity indicated by cathode band (not applicable for bidirectional configuration).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (bidirectional) | Transient conduction path | Both terminals function identically; no polarity assignment required in circuit layout |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including temperature cycling, HTRB, and ESD |
| ISO 7637-2 compliant | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) waveforms |
| Glass passivated junction | Enhances long-term reliability and moisture resistance versus epoxy-passivated alternatives |
| Fast response time | <1.0ps - Limits voltage overshoot before clamping engages during ESD events |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for green manufacturing |
Applications
| Automotive Power Line Protection | Industrial CAN Bus Interface |
|---|---|
Use Scenario: Protecting 24V battery-fed ECUs against load dump and alternator transients in passenger vehicles and commercial trucks. IC Role / Device Role / Timing Role: Primary clamping device placed at power entry point to limit rail voltage to safe levels for downstream regulators and microcontrollers. Use Value: Withstands 1500W pulses while clamping to 45.7V - maintaining <10V margin below typical 55V automotive absolute max ratings. | Use Scenario: Shielding CAN FD transceivers from ESD and inductive switching noise on factory automation networks. IC Role / Device Role / Timing Role: Bidirectional TVS placed across CAN_H/CAN_L differential pair to suppress common-mode surges without disrupting signal integrity. Use Value: Symmetrical 31.4–34.7V breakdown ensures equal clamping in both directions, preserving differential signaling margins during ±8kV contact ESD events. |
| Telecom DC Power Input | Renewable Energy Controller Interface |
Use Scenario: Safeguarding PoE-powered switches and base station radios from lightning-induced surges on 48V DC input lines. IC Role / Device Role / Timing Role: Secondary-level TVS deployed after primary MOV/GDT stage to handle residual fast-rising transients. Use Value: Sub-1ps response captures steep-fronted surges missed by slower protectors, reducing risk of latch-up in Ethernet PHYs. | Use Scenario: Protecting solar charge controller communication ports (RS-485, Modbus) from ground potential differences and grid-switching transients. IC Role / Device Role / Timing Role: Bidirectional clamp on isolated data lines to prevent damage to optocouplers and level shifters during earth fault events. Use Value: 28.2V VWM allows compatibility with 24V/36V control logic while delivering 45.7V clamping - sufficient to avoid false triggering yet robust against 1kV surge tests. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33CA | 600W rating, SMB package (smaller footprint), higher RθJA = 65°C/W | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 1 (load dump) | Select when board space is constrained and peak surge energy remains ≤600W |
| 1.5KE33CA | Through-hole DO-201 package, same 1500W rating but slower response (~1ns), no AEC-Q101 qualification | Not suitable for automotive or high-reliability automated assembly | Choose only for legacy through-hole designs where rework tolerance outweighs automotive compliance needs |
Compared with SMBJ33CA and 1.5KE33CA, the 1.5SMC33CAH delivers superior automotive readiness (AEC-Q101 + ISO 7637-2), optimized thermal performance (RθJC = 15°C/W), and surface-mount scalability - making it the preferred choice for new automotive and industrial designs requiring robust, automated-compatible surge protection.
Availability
1.5SMC33CAH is available at Aetrix Electronics and suitable for automotive electronics, industrial CAN bus interfaces, and telecom DC power inputs requiring stable component supply and full AEC-Q101 traceability.
Supply support for 1.5SMC33CAH 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, and rectifiers with global distribution and AEC-Q101 validation capability.
The 1.5SMC33CAH belongs to TSC's SMC-family of high-power surface-mount TVS diodes engineered specifically for automotive and industrial surge immunity - balancing clamping performance, thermal efficiency, and automated assembly compatibility.
FAQ
What is the clamping voltage of the 1.5SMC33CAH at its rated peak pulse current?
The 1.5SMC33CAH has a maximum clamping voltage (VC) of 45.7V at 34A peak impulse current (IPPM), measured using the 10/1000μs waveform per Fig.5 in the datasheet. This value defines the upper voltage limit imposed on protected circuits during standardized surge events and is critical for ensuring downstream components remain within their absolute maximum ratings.
Is the 1.5SMC33CAH suitable for automotive applications?
Yes, the 1.5SMC33CAH is AEC-Q101 qualified and meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements - confirming its suitability for automotive power line and data interface protection. Its DO-214AB package supports automated placement, and its -55°C to +150°C operating range aligns with under-hood and ECU environmental demands.
How does the bidirectional configuration of the 1.5SMC33CAH affect circuit design?
The 1.5SMC33CAH's bidirectional structure eliminates polarity sensitivity - both terminals serve identically as conduction paths during positive or negative transients. This simplifies PCB layout (no cathode marking required), enables use across differential lines like CAN or RS-485, and avoids misorientation risks during automated assembly - unlike unidirectional variants such as 1.5SMC33CH.
What is the working stand-off voltage (VWM) of the 1.5SMC33CAH, and why does it matter?
The 1.5SMC33CAH has a working stand-off voltage (VWM) of 28.2V, meaning it remains in high-impedance state with ≤1μA leakage up to this DC or RMS voltage. This parameter ensures reliable system operation without false triggering during normal 24V or 28V rail conditions, while still allowing rapid transition to low-impedance clamping when transients exceed the breakdown threshold.
Does the 1.5SMC33CAH require heatsinking in typical applications?
In most single-pulse or low-duty-cycle surge scenarios, the 1.5SMC33CAH does not require external heatsinking due to its low thermal resistance (RθJC = 15°C/W) and short transient duration. However, for repetitive surges or high ambient temperatures (>100°C), PCB copper area per JEDEC Std. 51-3 and thermal vias are recommended to maintain junction temperature ≤150°C and preserve long-term reliability.
1.5SMC33CAH 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
1.5SMC33CAH FAQ
1.How can I place an order for 1.5SMC33CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC33CAH 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 1.5SMC33CAH reliable?
The price and inventory of 1.5SMC33CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC33CAH is usually 5 days.
3.What payment methods are accepted for 1.5SMC33CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC33CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC33CAH?
1.5SMC33CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC33CAH 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 1.5SMC33CAH?
For technical support, including 1.5SMC33CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC33CAH requirements.
6.How does Aetrix verify that 1.5SMC33CAH is sourced from the original manufacturer or authorized distributors?
All 1.5SMC33CAH 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 1.5SMC33CAH meets industry standards.
7.What is the process for return or replacement of 1.5SMC33CAH?
All 1.5SMC33CAH units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC33CAH, 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 1.5SMC33CAH part is unused and in its original packaging.
Return procedure for 1.5SMC33CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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