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Taiwan Semiconductor Corporation 1KSMB11CA
- Part No.:
- 1KSMB11CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1KSMB11CA.pdf
- Description:
- TVS DIODE 9.4VWM 15.6VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,724
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Product details
Overview
1KSMB11CA from Taiwan Semiconductor is a bi-directional 1000W transient voltage suppressor (TVS) in DO-214AA (SMB) package, with breakdown voltage 10.5–11.6 V at 1 mA test current, stand-off voltage 9.40 V, maximum clamping voltage 15.6 V at 64.1 A peak pulse current, and junction temperature range −55 °C to +175 °C. It protects DC power rails in switching mode power supplies and consumer displays against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the 1KSMB11CA datasheet, 1KSMB11CA pinout, 1KSMB11CA application, or 1KSMB11CA equivalent, this page delivers verified electrical specs, bi-directional TVS behavior, SMB package mechanical data, clamping performance under 10/1000 µs surge, and real-world use cases in adapters and monitors - all confirmed from Taiwan Semiconductor's official I2102 datasheet.
Technical Context
The 1KSMB11CA is a single-die, bi-directional TVS diode designed for unidirectional and bidirectional transient suppression without polarity dependency. Its glass-passivated junction ensures stable breakdown and low leakage (<5 µA at 9.40 V), while its <1.0 ps response time enables protection of fast-edge digital and analog signal paths.
Rated for 1000 W non-repetitive peak pulse power (10/1000 µs waveform), it operates across −55 °C to +175 °C and meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability standards. Its 20 °C/W junction-to-lead thermal resistance supports reliable power dissipation in high-density PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR min/max | 10.5 V / 11.6 V at 1 mA - defines guaranteed conduction onset under surge, enabling precise overvoltage threshold setting |
| VWM | 9.40 V - maximum continuous reverse operating voltage before leakage exceeds 5 µA, ensuring no false triggering in nominal 9 V rail systems |
| VC@IPP | 15.6 V at 64.1 A - clamped voltage during full-rated 10/1000 µs surge, limiting downstream IC stress to safe levels |
| PPPSM | 1000 W - peak pulse power handling capacity, supporting automotive load dump and industrial surge immunity compliance |
| Junction Temp | −55 °C to +175 °C - wide operational range suitable for under-hood, industrial, and enclosed power adapter environments |
| Package | DO-214AA (SMB) - surface-mount outline with 0.110 g mass, optimized for automated placement and reflow compatibility |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band (not applicable for bi-directional 1KSMB11CA - symmetric terminal function).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bi-directional transient path | Either terminal serves as input/output for surge current - no polarity orientation required during placement |
| Case | Non-electrical mechanical reference | Plastic body provides insulation and thermal path; no internal connection to die |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable VBR tolerance and long-term reliability under repeated surge stress |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnect/connect), and Pulse 3a/3b (capacitive coupling) in automotive ECUs |
| Moisture sensitivity level 1 | No floor life limitation or bake requirement prior to reflow - simplifies SMT line logistics |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU RoHS directives for environmentally constrained end equipment |
Applications
| Switching Mode Power Supply (SMPS) | AC-DC Adapters |
|---|---|
Use Scenario: Input rectifier stage subjected to line surges and EFT bursts during AC mains switching. IC Role / Device Role / Timing Role: Bi-directional TVS placed across bulk capacitor or bridge rectifier output to clamp differential-mode transients. Use Value: Limits voltage excursion to ≤15.6 V during 1000 W surges, protecting downstream PWM controllers and MOSFETs rated for 20 V max. | Use Scenario: Secondary-side DC output exposed to load-dump reflections and hot-plug transients in wall-wart designs. IC Role / Device Role / Timing Role: Standoff-rated TVS connected between +VOUT and GND to absorb 64.1 A pulses without degradation. Use Value: Maintains 9.40 V nominal operation while suppressing >100 V spikes - prevents brownout resets and regulator latch-up. |
| Television Power Boards | Monitor Backlight Drivers |
Use Scenario: Main 12 V/24 V rail feeding logic and audio subsystems experiences coupled noise from internal SMPS and HDMI hot-plug events. IC Role / Device Role / Timing Role: 1KSMB11CA deployed on each critical rail to provide localized clamping independent of system ground bounce. Use Value: Sub-16 V clamping ensures microcontrollers and audio codecs remain within absolute maximum ratings during multi-kV ESD discharge events. | Use Scenario: CCFL or LED backlight driver ICs endure voltage reversal and inductive kickback during dimming transitions and fault conditions. IC Role / Device Role / Timing Role: Bi-directional suppression across driver outputs to absorb both positive and negative polarity transients. Use Value: Symmetric clamping eliminates need for dual unidirectional devices - reduces BOM count and board area by 50% vs discrete solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ11CA | Same DO-214AA package, identical VBR (10.5–11.6 V), but 600 W PPPM rating vs 1000 W | Limited to lower-energy surges; unsuitable for ISO 7637-2 Pulse 1 or high-current load dump | Select only when system-level surge testing confirms ≤600 W requirements and space constraints prohibit larger packages |
| 1.5SMC11CA | Higher 1500 W rating, same VBR, but DO-214AB (SMC) package - 2.5× larger footprint and 0.25 g mass | Better thermal margin for repetitive surges; requires PCB layout revision due to larger pad dimensions | Choose when long-term reliability under frequent transients is prioritized over board area and weight |
Compared with SMBJ11CA and 1.5SMC11CA, the 1KSMB11CA uniquely balances 1000 W surge capability, SMB footprint, and bi-directional symmetry - making it optimal for cost-sensitive, space-constrained adapters and display power supplies requiring full ISO 7637-2 compliance without package redesign.
Availability
1KSMB11CA is available at Aetrix Electronics and suitable for switching mode power supplies, AC-DC adapters, and television power boards requiring stable component supply, consistent parametric performance, and full traceability across production lots.
Supply support for 1KSMB11CA 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 markets.
The 1KSMBxxCA series was developed specifically for high-reliability, surface-mount transient suppression in compact power conversion systems - emphasizing robustness, automated assembly compatibility, and compliance with automotive and industrial surge immunity standards.
FAQ
What does the 'CA' suffix indicate in 1KSMB11CA?
The 'CA' suffix in 1KSMB11CA denotes a bi-directional configuration, meaning the device functions identically in both polarities - unlike unidirectional variants (e.g., 1KSMB11A) that require correct anode/cathode orientation. This allows placement without polarity concern and enables suppression of both positive and negative transients on the same node, which is essential for AC-coupled or floating signal lines. The 1KSMB11CA achieves this using a back-to-back diode structure inside a single DO-214AA package.
What is the maximum clamping voltage of 1KSMB11CA and under what test condition?
The maximum clamping voltage of 1KSMB11CA is 15.6 V, measured at a peak pulse current (IPP) of 64.1 A using the standardized 10/1000 µs double-exponential surge waveform. This value is guaranteed across the full operating temperature range and represents the highest voltage the device will allow to appear across protected circuitry during a full-rated transient event. Engineers use this spec to verify downstream components remain within their absolute maximum voltage ratings when 1KSMB11CA is deployed.
Is 1KSMB11CA compliant with automotive transient standards?
Yes, 1KSMB11CA meets ISO 7637-2 for Pulses 1, 2a, 2b, 3a, and 3b - covering key automotive electrical disturbance scenarios including battery disconnection, load dump simulation, and capacitive coupling noise. Its 1000 W peak power rating, fast <1.0 ps response, and −55 °C to +175 °C junction temperature range make it suitable for engine control units, infotainment power rails, and body electronics where direct battery connection exists. However, it is not qualified to AEC-Q101 unless explicitly stated in TSC's qualification report.
What is the standoff voltage (VWM) of 1KSMB11CA and why does it matter?
The standoff voltage (VWM) of 1KSMB11CA is 9.40 V - the maximum DC or continuous reverse voltage that can be applied without exceeding 5 µA leakage current. This parameter ensures the device remains non-conductive during normal operation, preventing power loss or interference in 9 V nominal systems such as adapter standby rails or TV logic supplies. Selecting a VWM ≥10–15% above the system's maximum steady-state voltage avoids nuisance conduction while preserving sufficient margin for ripple and tolerance.
Can 1KSMB11CA replace a unidirectional TVS like 1KSMB11A in an existing design?
1KSMB11CA can replace 1KSMB11A only if the circuit topology permits bi-directional protection - for example, across a DC rail referenced to ground or in AC-coupled paths. Unlike 1KSMB11A, the 1KSMB11CA has no polarity marking and conducts equally in both directions, so it must not be used where forward conduction would disrupt bias networks or cause latch-up. No PCB layout change is needed since both share the DO-214AA (SMB) footprint, but functional validation under both polarity transients is required before substitution.
1KSMB11CA 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):
- 9.4V
- Voltage - Breakdown (Min):
- 10.5V
- Voltage - Clamping (Max) @ Ipp:
- 15.6V
- Current - Peak Pulse (10/1000µs):
- 64.1A
- 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)
1KSMB11CA FAQ
1.How can I place an order for 1KSMB11CA through Aetrix?
Please submit a Request for Quotation (RFQ) for 1KSMB11CA 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 1KSMB11CA reliable?
The price and inventory of 1KSMB11CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1KSMB11CA is usually 5 days.
3.What payment methods are accepted for 1KSMB11CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1KSMB11CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1KSMB11CA?
1KSMB11CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1KSMB11CA 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 1KSMB11CA?
For technical support, including 1KSMB11CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1KSMB11CA requirements.
6.How does Aetrix verify that 1KSMB11CA is sourced from the original manufacturer or authorized distributors?
All 1KSMB11CA 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 1KSMB11CA meets industry standards.
7.What is the process for return or replacement of 1KSMB11CA?
All 1KSMB11CA units undergo pre-shipment inspection (PSI). If there is an issue with 1KSMB11CA, 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 1KSMB11CA part is unused and in its original packaging.
Return procedure for 1KSMB11CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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