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Taiwan Semiconductor Corporation 1KSMB11A
- Part No.:
- 1KSMB11A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1KSMB11A.pdf
- Description:
- TVS DIODE 9.4VWM 15.6VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,706
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Product details
Overview
1KSMB11A from Taiwan Semiconductor is a unidirectional 1000W surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, with breakdown voltage 10.5–11.6 V at 1.0 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 against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the 1KSMB11A datasheet, 1KSMB11A pinout, 1KSMB11A application, or 1KSMB11A equivalent, key selection criteria include unidirectional polarity, 9.40 V working voltage, 15.6 V clamping under 64.1 A surge, DO-214AA mechanical compatibility, and compliance with J-STD-020 moisture level 1 and IEC 61249-2-21 halogen-free requirements.
Technical Context
The 1KSMB11A operates as a silicon avalanche diode, leveraging glass-passivated junction technology for stable breakdown and fast response (<1.0 ps from 0 V to VBR(min)). Its unidirectional configuration provides reverse-biased transient suppression only, with forward voltage of 3.5 V at 50 A for devices with VBR ≤ 50 V - confirmed for this part.
Thermal performance is defined by RθJL = 20 °C/W and RθJA = 100 °C/W, enabling reliable operation up to 175 °C junction temperature. It meets ISO 7637-2 Pulse 1 (inductive load dump), Pulse 2a/2b (battery disconnect/line drop), and Pulse 3a/3b (capacitive coupling/switching noise) waveforms without derating at 25 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 9.40 V - maximum continuous reverse operating voltage before leakage exceeds 5 µA |
| VBR @ IT = 1.0 mA | 10.5–11.6 V - guaranteed avalanche initiation range, ensuring predictable turn-on during transients |
| VC @ IPP = 64.1 A | 15.6 V - peak clamped voltage across device during 10/1000 µs surge, limiting downstream stress |
| PPPSM | 1000 W - non-repetitive peak pulse power handling per 10/1000 µs waveform, defining surge robustness |
| Junction Temp Range | −55 °C to +175 °C - supports operation in automotive engine bays and industrial power converters |
| Package | DO-214AA (SMB) - standardized surface-mount outline with 0.110 g mass and matte tin-plated leads |
Pinout & Package
DO-214AA (SMB) package: molded epoxy case meeting UL 94V-0, cathode band marking for polarity identification, lead finish compliant with J-STD-002 solderability, and JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional TVS configuration |
| Cathode | Reverse-biased transient clamp terminal | Connected to protected line (e.g., +12 V rail); avalanche conduction occurs when voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure |
| Response time <1.0 ps | Enables clamping before transient energy couples into sensitive downstream circuitry (e.g., MCU I/O or PMIC inputs) |
| ISO 7637-2 compliance | Validated for automotive-level load dump and supply line disturbance immunity without external filtering |
| Moisture sensitivity level 1 | Allows unlimited floor life before reflow, eliminating bake requirements in SMT assembly |
Applications
| Switching Mode Power Supply (SMPS) | AC-DC Adapter |
|---|---|
Use Scenario: Protection of primary-side MOSFET gate drivers and secondary-side rectifier outputs against flyback spikes and line surges. IC Role / Device Role / Timing Role: Unidirectional TVS placed across DC bus or output rail to clamp transient overvoltage before it reaches controller ICs or capacitors. Use Value: Limits peak voltage to 15.6 V during 64.1 A 10/1000 µs surge, preventing gate oxide rupture in 20 V-rated controllers and electrolytic capacitor overvoltage. | Use Scenario: Input-stage surge protection on universal-input (90–264 VAC) adapters subject to lightning-induced line transients. IC Role / Device Role / Timing Role: Standoff-rated TVS on bulk DC link after bridge rectifier, absorbing repetitive 1000 W pulses without degradation. Use Value: Maintains 9.40 V working voltage margin above nominal 9 V output while clamping to 15.6 V - compatible with 16 V-rated output capacitors and LDOs. |
| Television Power Board | Monitor Backlight Inverter |
Use Scenario: Protection of main 12 V/24 V logic and audio subsystem rails against ESD and relay-switching noise from tuner or HDMI hot-plug events. IC Role / Device Role / Timing Role: Localized TVS mounted near SoC power pins or audio codec supply inputs to suppress sub-100 ns transients. Use Value: Sub-1 ps response ensures clamping initiates before 10 ns rise-time ESD events propagate through PCB traces, reducing radiated emissions. | Use Scenario: Surge suppression on CCFL or LED driver high-voltage boost outputs exposed to lamp arc ignition transients. IC Role / Device Role / Timing Role: Clamp device placed between boost converter output and lamp connector to limit open-circuit voltage spikes. Use Value: Withstands 100 A peak forward surge (IFSM) and maintains 15.6 V clamping - protecting driver FETs rated for 20–30 V breakdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ11A (ON Semiconductor) | Same DO-214AA package, identical VWM (9.4 V), VBR (10.5–11.6 V), and VC (15.6 V); RθJA = 110 °C/W vs. 100 °C/W for 1KSMB11A | Validated for same ISO 7637-2 pulses; slightly higher thermal resistance requires marginally larger copper pour for equivalent power dissipation | Drop-in replacement where layout allows minor thermal derating; preferred for designs already using ON Semi SMBJ family |
| P6SMB11A (STMicroelectronics) | VWM = 9.4 V, VBR = 10.5–11.6 V, VC = 15.6 V, same 1000 W rating; moisture sensitivity level 1 confirmed, but halogen-free status not explicitly stated in latest revision | Identical electrical performance; differs in RoHS/halogen-free documentation - critical for automotive Tier 1 BOM compliance | Select when halogen-free certification is not mandated; verify ST's latest material declaration if used in regulated automotive programs |
Compared with SMBJ11A and P6SMB11A, the 1KSMB11A offers tighter thermal resistance (100 °C/W vs. 110/105 °C/W), enabling higher sustained surge duty cycles in compact layouts, and explicit IEC 61249-2-21 halogen-free compliance - advantageous for export-focused consumer electronics.
Availability
1KSMB11A is available at Aetrix Electronics and suitable for switching mode power supplies, AC-DC adapters, and television power boards requiring stable component supply with full traceability and lifecycle management.
Supply support for 1KSMB11A 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving global industrial, computing, and consumer markets since 1979.
The 1KSMBxxA series belongs to TSC's high-power surface-mount TVS portfolio, engineered specifically for automotive-grade transient immunity and industrial power system robustness - emphasizing low clamping voltage, fast response, and AEC-Q200-aligned reliability.
FAQ
What is the maximum clamping voltage of the 1KSMB11A under a 10/1000 µs surge?
The 1KSMB11A has a maximum clamping voltage (VC) of 15.6 V when subjected to a 64.1 A peak pulse current with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees that downstream components see no more than 15.6 V during such a transient event. The 1KSMB11A achieves this while maintaining its 9.40 V stand-off voltage, providing a clear margin against false triggering.
Is the 1KSMB11A suitable for bidirectional transient suppression?
No, the 1KSMB11A is a unidirectional TVS diode and is not suitable for bidirectional suppression. For bidirectional operation, the 1KSMB11CA variant must be used - it carries the "CA" suffix and features symmetrical breakdown in both polarities. The 1KSMB11A has a cathode band marking and conducts only in forward bias; reverse conduction occurs only during avalanche, making it appropriate for DC rail protection where polarity is fixed.
What is the junction-to-lead thermal resistance (RθJL) of the 1KSMB11A?
The junction-to-lead thermal resistance (RθJL) of the 1KSMB11A is 20 °C/W, as specified in the Thermal Performance section of the official Taiwan Semiconductor datasheet. This parameter enables accurate calculation of junction temperature rise above lead temperature during pulsed operation and informs heatsinking decisions when multiple surges occur in rapid succession. The 1KSMB11A leverages this low RθJL to sustain repeated 1000 W transients without exceeding its 175 °C maximum junction temperature.
Does the 1KSMB11A meet automotive transient immunity standards?
Yes, the 1KSMB11A meets ISO 7637-2 Pulse 1 (inductive load dump), Pulse 2a (battery disconnect), Pulse 2b (line drop), Pulse 3a (capacitive coupling), and Pulse 3b (switching noise) requirements. These tests simulate real-world automotive electrical disturbances, and the 1KSMB11A's 1000 W rating and 15.6 V clamping ensure compliance without additional filtering. While not AEC-Q200 certified as a complete part, its construction and test validation align with automotive-grade design practices.
What is the moisture sensitivity level (MSL) and reflow profile compatibility of the 1KSMB11A?
The 1KSMB11A has a moisture sensitivity level (MSL) of Level 1 per J-STD-020, meaning it has unlimited floor life at ≤30 °C/60% RH and requires no baking prior to reflow soldering. It is compatible with standard lead-free reflow profiles (peak temperature ≤260 °C), and its matte tin-plated leads meet J-STD-002 solderability requirements. This simplifies manufacturing for high-volume SMT lines using the DO-214AA (SMB) footprint.
1KSMB11A 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:
- 1
- Bidirectional Channels:
- -
- 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)
1KSMB11A FAQ
1.How can I place an order for 1KSMB11A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1KSMB11A 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 1KSMB11A reliable?
The price and inventory of 1KSMB11A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1KSMB11A is usually 5 days.
3.What payment methods are accepted for 1KSMB11A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1KSMB11A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1KSMB11A?
1KSMB11A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1KSMB11A 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 1KSMB11A?
For technical support, including 1KSMB11A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1KSMB11A requirements.
6.How does Aetrix verify that 1KSMB11A is sourced from the original manufacturer or authorized distributors?
All 1KSMB11A 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 1KSMB11A meets industry standards.
7.What is the process for return or replacement of 1KSMB11A?
All 1KSMB11A units undergo pre-shipment inspection (PSI). If there is an issue with 1KSMB11A, 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 1KSMB11A part is unused and in its original packaging.
Return procedure for 1KSMB11A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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