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Taiwan Semiconductor Corporation 1.5SMC33H
- Part No.:
- 1.5SMC33H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC33H.pdf
- Description:
- 1500W, 33V, 10%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:6,777
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Product details
Overview
1.5SMC33H from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for high-energy surge protection in DC power lines and signal interfaces. It features a 33V breakdown voltage (29.7–36.3V), 1500W peak pulse power rating, 47.7V maximum clamping voltage at 33A peak current, and DO-214AB (SMC) package - used in automotive power supply rail protection and industrial I/O interface hardening.
For engineers reviewing the 1.5SMC33H datasheet, 1.5SMC33H pinout, 1.5SMC33H application, or 1.5SMC33H equivalent, this device delivers AEC-Q101 qualification, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, sub-1ps response time, <1μA leakage above 26.8V, and robust thermal performance (RθJA = 50°C/W) for reliable overvoltage immunity in harsh environments.
Technical Context
The 1.5SMC33H operates as a unidirectional avalanche diode with glass-passivated junction, enabling fast clamping of transients induced by load switching, ESD, or lightning surges. Its 1.0mA test current and 26.8V working stand-off voltage define its DC blocking threshold before breakdown.
Thermal design is supported by RθJC = 15°C/W and TJMAX = 150°C, allowing sustained operation under repetitive surge conditions when mounted on adequate copper area. The DO-214AB case meets UL 94V-0 and JESD201 Class 2 whisker resistance standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR Min/Max | 29.7V / 36.3V - defines guaranteed avalanche onset range at 1.0mA test current; ensures consistent clamping initiation across temperature and unit variation |
| VWM | 26.8V - maximum continuous reverse operating voltage; sets safe DC bias margin before leakage rises significantly |
| VC @ IPPM | 47.7V at 33A - peak clamped voltage during 10/1000μs surge; determines protected circuit's maximum transient exposure level |
| PPK | 1500W - peak pulse power handling per 1ms waveform; enables suppression of high-energy automotive load-dump events |
| IR @ VWM | ≤1μA - ultra-low reverse leakage at rated stand-off; minimizes standby power loss in battery-backed systems |
| TJMAX | +150°C - maximum junction temperature; supports operation in under-hood automotive or industrial enclosures |
| RθJA | 50°C/W - junction-to-ambient thermal resistance; informs PCB copper area requirements for thermal management |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, unidirectional configuration with cathode band marking. Case meets UL 94V-0, matte tin-plated leads, MSL Level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path); conducts during forward surge or bidirectional variants |
| Cathode | Avalanche clamping terminal | Connected to protected line (e.g., 24V rail); initiates breakdown when reverse voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for under-hood ECUs and body control modules |
| ISO 7637-2 compliant | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling) without degradation |
| Glass passivated junction | Enhances long-term stability and moisture resistance vs. epoxy-passivated alternatives - critical for high-humidity industrial deployments |
| Fast response time | Typically <1.0ps - clamps before sensitive downstream ICs (e.g., CAN transceivers, microcontrollers) experience overstress |
| Moisture sensitivity level 1 | No floor life limitation or bake requirement before reflow - simplifies SMT assembly and reduces manufacturing overhead |
Applications
| Automotive Power Rail Protection | Industrial Digital I/O Protection |
|---|---|
Use Scenario: Protecting 24V supply lines in engine control units against load-dump transients up to 120V and 1500W pulses. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between power rail and chassis ground to clamp surges within 47.7V. Use Value: Prevents damage to voltage regulators and microcontrollers during alternator disconnection events per ISO 7637-2 Pulse 5a. |
Use Scenario: Safeguarding RS-485 transceiver inputs in factory automation PLCs exposed to ESD and inductive switching noise. IC Role / Device Role / Timing Role: Standoff protection device shunting transients from data lines to ground before they reach the PHY layer. Use Value: Maintains signal integrity and prevents latch-up in communication ICs during 8kV contact ESD events (IEC 61000-4-2). |
| Telecom DC Power Input | Consumer Equipment AC-DC Adapter Output |
Use Scenario: Securing -48V telecom power feeds against lightning-induced surges entering via outdoor cabling. IC Role / Device Role / Timing Role: Primary surge suppression stage upstream of DC-DC converters and hot-swap controllers. Use Value: Limits clamped voltage to 47.7V, ensuring downstream silicon remains below absolute maximum ratings during 10/1000μs surges. |
Use Scenario: Adding secondary-level surge immunity to 12V/19V outputs of laptop adapters subject to user-handling ESD and mains-coupled noise. IC Role / Device Role / Timing Role: Low-leakage (≤1μA) TVS placed after output filter capacitor to avoid standby current drain. Use Value: Enables compliance with IEC 61000-4-5 Level 3 (1kV line-earth) while maintaining <1μA quiescent current at 26.8V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33A | 600W rating (vs. 1500W), SMB package (smaller footprint, higher RθJA ≈ 65°C/W) | Limited to lower-energy transients; unsuitable for automotive load-dump per ISO 7637-2 Pulse 5 | Select only for space-constrained consumer electronics where peak surge energy ≤600W |
| 1.5KE33A | Through-hole TO-204AA (DO-41) package, same 1500W rating but slower thermal recovery and no AEC-Q101 qualification | Not suitable for automated SMT lines or automotive vibration environments; requires manual insertion or wave soldering | Choose only for legacy through-hole designs or prototyping where reflow compatibility is not required |
Compared with SMBJ33A and 1.5KE33A, the 1.5SMC33H uniquely combines 1500W surge capability, AEC-Q101 qualification, DO-214AB SMT packaging, and ISO 7637-2 compliance - making it the only option among the three qualified for production automotive power rail protection.
Availability
1.5SMC33H is available at Aetrix Electronics and suitable for automotive power rail protection, industrial digital I/O hardening, telecom DC feed protection, and consumer adapter output surge suppression requiring stable component supply and full traceability.
Supply support for 1.5SMC33H 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-Q101 validation capabilities.
The 1.5SMC33H belongs to TSC's high-power surface-mount TVS family engineered specifically for ISO 7637-2 and IEC 61000-4-5 compliant surge immunity in automotive, industrial, and telecom infrastructure applications.
FAQ
What is the breakdown voltage tolerance for the 1.5SMC33H?
The 1.5SMC33H has a specified breakdown voltage range of 29.7V to 36.3V at 1.0mA test current, representing ±10% tolerance around the nominal 33V rating. This range is measured per ANSI/IEEE C62.35 and guarantees consistent clamping behavior across production lots and temperature extremes from –55°C to +150°C.
Is the 1.5SMC33H suitable for bidirectional surge protection?
No - the 1.5SMC33H is a unidirectional TVS diode intended for DC line protection with defined anode/cathode polarity. For bidirectional applications (e.g., AC lines or differential data buses), TSC offers the 1.5SMC33AH variant, which provides symmetrical clamping in both directions and uses the same DO-214AB package.
Does the 1.5SMC33H require derating at elevated ambient temperatures?
Yes - the 1.5SMC33H must be derated above 25°C ambient per the pulse derating curve (Fig.2 in TSC documentation). At 85°C ambient, its 1500W peak pulse power rating drops to approximately 900W; at 125°C, it falls to ~450W. Proper PCB copper area and airflow must be validated for target operating conditions.
What is the maximum clamping voltage of the 1.5SMC33H under standard test conditions?
The 1.5SMC33H exhibits a maximum clamping voltage (VC) of 47.7V when subjected to its rated 33A peak pulse current (IPPM) using the 10/1000μs waveform defined in Fig.5. This value is guaranteed across all units and forms the basis for downstream circuit overvoltage margining.
How does the 1.5SMC33H compare to the older 1.5KE33A in terms of mounting and reliability?
The 1.5SMC33H uses DO-214AB (SMC) surface-mount packaging optimized for automated placement and reflow, whereas the 1.5KE33A uses through-hole DO-41. The 1.5SMC33H also carries AEC-Q101 qualification and meets ISO 7637-2 Pulse 1/2a/2b/3a/3b - unlike the 1.5KE33A - making it suitable for modern automotive and industrial SMT production with higher reliability assurance.
1.5SMC33H 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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 26.8V
- Voltage - Breakdown (Min):
- 29.7V
- Voltage - Clamping (Max) @ Ipp:
- 47.7V
- Current - Peak Pulse (10/1000µs):
- 33A
- 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)
1.5SMC33H FAQ
1.How can I place an order for 1.5SMC33H through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC33H 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 1.5SMC33H reliable?
The price and inventory of 1.5SMC33H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC33H is usually 5 days.
3.What payment methods are accepted for 1.5SMC33H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC33H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC33H?
1.5SMC33H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC33H 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 1.5SMC33H?
For technical support, including 1.5SMC33H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC33H requirements.
6.How does Aetrix verify that 1.5SMC33H is sourced from the original manufacturer or authorized distributors?
All 1.5SMC33H 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 1.5SMC33H meets industry standards.
7.What is the process for return or replacement of 1.5SMC33H?
All 1.5SMC33H units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC33H, 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 1.5SMC33H part is unused and in its original packaging.
Return procedure for 1.5SMC33H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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