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Taiwan Semiconductor Corporation 1KSMB33CA
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- Part No.:
- 1KSMB33CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1KSMB33CA.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,651
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Product details
Overview
1KSMB33CA from Taiwan Semiconductor is a bi-directional 1000W transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, with breakdown voltage 31.4–34.7 V at 1 mA, stand-off voltage 28.2 V, maximum clamping voltage 45.7 V at 21.9 A, and junction temperature range −55 °C to +175 °C. It protects DC power rails and signal lines in switching mode power supplies, adapters, and display electronics against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the 1KSMB33CA datasheet, 1KSMB33CA pinout, 1KSMB33CA application, or 1KSMB33CA equivalent, key selection criteria include bidirectional clamping capability, 1000 W peak pulse power rating, 28.2 V working voltage, sub-1 ps response time, and compliance with J-STD-020 moisture sensitivity level 1 for automated SMT assembly.
Technical Context
This bi-directional TVS diode operates symmetrically across both polarities, enabling robust protection of AC-coupled or floating signal paths without polarity dependency. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1 µA at VWM), while the DO-214AA package supports high thermal dissipation via lead-to-junction resistance of 20 °C/W.
The device meets ISO 7637-2 for automotive transient immunity (Pulse 1, 2a, 2b, 3a, 3b) and is rated for 1000 W non-repetitive peak pulse power under 10/1000 µs waveform. Clamping occurs within <1.0 ps from 0 V to VBR(min), limiting overvoltage exposure during fast-rising ESD or load-dump events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 31.4 V / 34.7 V - defines reliable conduction onset under reverse/forward surge, ensuring predictable clamping threshold |
| VWM | 28.2 V - maximum continuous operating voltage before leakage exceeds 1 µA; sets usable DC rail margin |
| VC @ IPP | 45.7 V at 21.9 A - peak clamped voltage during 10/1000 µs surge; determines protected circuit's overvoltage ceiling |
| PPPM | 1000 W - peak pulse power handling per single 10/1000 µs event; enables survivability against severe transients |
| TJ Range | −55 °C to +175 °C - extended junction temperature range supports operation in under-hood or industrial environments |
| Package | DO-214AA (SMB) - surface-mount outline with 2.54 mm lead pitch, compatible with standard reflow profiles and J-STD-002 solderability |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band (not applicable for bi-directional 1KSMB33CA; terminals are symmetrical).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional transient current path | Either terminal accepts surge current in either polarity; no orientation required during placement |
| Leads (both) | Thermal and electrical interface | Provide mechanical attachment, heat conduction to PCB copper, and low-inductance surge return path |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under repeated surge stress without parameter drift |
| Sub-1 ps response time | Enables clamping before transient energy couples into downstream ICs, critical for protecting high-speed interfaces |
| ISO 7637-2 compliance | Validated performance against automotive load-dump and inductive-switching transients (Pulse 1/2a/2b/3a/3b) |
| J-STD-020 Level 1 moisture sensitivity | Allows unlimited floor life and standard SMT reflow without baking, reducing manufacturing overhead |
Applications
| Switching Mode Power Supply (SMPS) | AC-DC Adapters |
|---|---|
Use Scenario: Input rectifier stage and secondary-side DC bus in offline SMPS designs exposed to line surges and cross-regulation spikes. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across bulk capacitor or MOSFET drain-source to limit transient overshoot. Use Value: Limits peak voltage to ≤45.7 V during 1000 W surges, preventing overvoltage failure of 65 V-rated electrolytics and 60 V MOSFETs. | Use Scenario: Secondary-side output rail protection in universal-input wall adapters subject to plug-in/out transients and ESD. IC Role / Device Role / Timing Role: Standoff-clamp element between VOUT and GND, activated only during >28.2 V excursions. Use Value: Maintains <1 µA leakage at 28.2 V nominal output, avoiding standby current penalty while clamping to 45.7 V during 21.9 A surges. |
| Flat Panel TV Power Boards | Monitor Backlight Inverters |
Use Scenario: Protection of main 12 V/24 V logic and panel bias rails against coupling from internal switching noise and external ESD. IC Role / Device Role / Timing Role: Localized TVS on board-level power distribution nodes adjacent to DC-DC converters. Use Value: Withstands repetitive 10/1000 µs pulses up to 1000 W without degradation, supporting 10-year field life in consumer displays. | Use Scenario: Surge suppression on CCFL or LED backlight driver outputs where high-voltage transients occur during lamp strike or open-circuit faults. IC Role / Device Role / Timing Role: Bidirectional clamp across high-frequency AC output to ground, absorbing reflected energy. Use Value: Symmetrical clamping ensures equal protection during positive and negative half-cycles, eliminating need for dual unidirectional devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33CA (Bourns) | Same DO-214AA package, identical VWM (28.2 V), VC = 45.7 V, but rated for 600 W PPPM (vs. 1000 W) | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 1 or high-current load dump | Select when cost sensitivity outweighs peak power requirement and surge threat level is moderate |
| P6SMB33CA (Littelfuse) | Identical electrical specs (VBR 31.4–34.7 V, VC 45.7 V, PPPM 1000 W), same DO-214AA package, RoHS/halogen-free compliant | No functional difference; validated drop-in replacement in existing layouts and qualification tests | Preferred for dual-sourcing continuity where second-source validation is required |
Compared with SMBJ33CA and P6SMB33CA, the 1KSMB33CA delivers full 1000 W surge capacity in the same SMB footprint, matching P6SMB33CA electrically while offering competitive pricing and Taiwan Semiconductor's extended temperature support (−55 °C to +175 °C).
Availability
1KSMB33CA is available at Aetrix Electronics and suitable for switching mode power supplies, AC-DC adapters, and flat-panel display power boards requiring stable component supply, automotive-grade transient immunity, and high-volume SMT manufacturability.
Supply support for 1KSMB33CA 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 for industrial, computing, and consumer applications.
The 1KSMBxxCA series is designed specifically for high-power, surface-mount transient suppression in space-constrained power conversion systems where ISO 7637-2 compliance and 175 °C operation are mandatory.
FAQ
What does the 'CA' suffix indicate in 1KSMB33CA?
The 'CA' suffix denotes a bi-directional configuration: the 1KSMB33CA conducts and clamps transient energy equally in both polarities, unlike unidirectional variants (e.g., 1KSMB33A) that require correct anode/cathode orientation. This makes the 1KSMB33CA ideal for AC signal lines, transformer-coupled circuits, or any application where voltage polarity reversal may occur during transients.
What is the maximum clamping voltage of the 1KSMB33CA and under what test condition?
The maximum clamping voltage of the 1KSMB33CA is 45.7 V, measured at a peak impulse current (IPP) of 21.9 A using the standardized 10/1000 µs double-exponential waveform. This value represents the upper limit of voltage seen by protected circuitry during worst-case surge events, directly informing downstream component voltage ratings.
Is the 1KSMB33CA suitable for automotive applications?
Yes - the 1KSMB33CA meets ISO 7637-2 requirements for automotive transient immunity, including Pulse 1 (inductive load disconnect), Pulse 2a (sudden load removal), Pulse 2b (supply interruption), and Pulses 3a/3b (switching noise). Its −55 °C to +175 °C operating range and 1000 W surge rating make it appropriate for engine control unit (ECU) power inputs and body electronics modules.
How does the 1KSMB33CA compare to unidirectional TVS diodes like 1KSMB33A?
The 1KSMB33CA provides symmetrical clamping for both positive and negative transients, eliminating polarity-sensitive placement. In contrast, the unidirectional 1KSMB33A clamps only in reverse bias and conducts forward current like a rectifier. For DC rails with known polarity, 1KSMB33A offers slightly lower forward voltage; for AC or floating nodes, 1KSMB33CA is mandatory - the 1KSMB33CA cannot be substituted with 1KSMB33A without circuit redesign.
What is the moisture sensitivity level (MSL) and reflow profile compatibility of the 1KSMB33CA?
The 1KSMB33CA has J-STD-020 moisture sensitivity level 1, meaning it may be stored indefinitely at ambient conditions without baking prior to reflow. It is compatible with standard Pb-free reflow profiles (peak temperature ≤260 °C), and its matte tin-plated leads meet J-STD-002 solderability requirements, supporting high-yield automated placement and reflow in volume production of the 1KSMB33CA.
1KSMB33CA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- 1KSMB
- 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):
- 21.9A
- Power - Peak Pulse:
- 1000W (1kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
1KSMB33CA FAQ
1.How can I place an order for 1KSMB33CA through Aetrix?
Please submit a Request for Quotation (RFQ) for 1KSMB33CA 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 1KSMB33CA reliable?
The price and inventory of 1KSMB33CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1KSMB33CA is usually 5 days.
3.What payment methods are accepted for 1KSMB33CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1KSMB33CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1KSMB33CA?
1KSMB33CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1KSMB33CA 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 1KSMB33CA?
For technical support, including 1KSMB33CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1KSMB33CA requirements.
6.How does Aetrix verify that 1KSMB33CA is sourced from the original manufacturer or authorized distributors?
All 1KSMB33CA 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 1KSMB33CA meets industry standards.
7.What is the process for return or replacement of 1KSMB33CA?
All 1KSMB33CA units undergo pre-shipment inspection (PSI). If there is an issue with 1KSMB33CA, 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 1KSMB33CA part is unused and in its original packaging.
Return procedure for 1KSMB33CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1KSMB33CA Tags
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