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Taiwan Semiconductor Corporation 1KSMB11AH
- Part No.:
- 1KSMB11AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1KSMB11AH.pdf
- Description:
- TVS DIODE 9.4VWM 15.6VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,040
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Product details
Overview
1KSMB11AH from Taiwan Semiconductor is a unidirectional 1000W transient voltage suppressor (TVS) in DO-214AA (SMB) package, with breakdown voltage 10.5–11.6 V, stand-off voltage 9.40 V, clamping voltage 15.6 V at 64.1 A, and AEC-Q101 qualification for automotive-grade surge protection.
For engineers reviewing the 1KSMB11AH datasheet, 1KSMB11AH pinout, 1KSMB11AH application, or 1KSMB11AH equivalent, key selection criteria include its 1000W peak pulse power rating, sub-1 ps response time, ISO 7637-2 compliance, moisture sensitivity level 1, and unidirectional polarity marking for ESD and load-dump protection in automotive electronics.
Technical Context
The 1KSMB11AH uses a glass-passivated silicon junction to achieve fast transient response (<1.0 ps from 0 V to VBR(min)) and stable clamping under repetitive surge stress. Its thermal design supports 175°C maximum junction temperature and 20°C/W junction-to-lead resistance, enabling reliable operation in high-temperature engine bay environments.
It meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b waveforms for automotive electrical system immunity, with 10/1000 µs waveform rating and derating above 25°C ambient per published curves. The device is rated for 100 A non-repetitive forward surge current (8.3 ms half-sine), supporting inductive switching load protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 10.5 V / 11.6 V - defines minimum and maximum voltage at which avalanche conduction begins under 1 mA test current |
| VWM | 9.40 V - maximum continuous reverse operating voltage before leakage exceeds 5 µA |
| VC@IPP | 15.6 V at 64.1 A - clamping voltage during 10/1000 µs surge, limiting downstream circuit stress |
| PPPSM | 1000 W - peak pulse power handling capability under standardized transient waveform |
| IFSM | 100 A - peak forward surge current tolerance for unidirectional operation (8.3 ms half-sine) |
| TJ(max) | 175 °C - maximum junction temperature, enabling use in under-hood automotive modules |
| MSL | Level 1 per J-STD-020 - no floor life limitation; suitable for standard SMT reflow without baking |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, single-die unidirectional TVS diode with cathode band marking. Matte tin-plated leads, UL 94V-0 molding compound, 0.110 g typical weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side of protected line; conducts during forward surge events |
| Cathode (marked band) | Reverse-biased clamping terminal | Connected to higher-potential side; initiates avalanche clamping when reverse voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including temperature cycling, mechanical shock, and humidity testing per stress test requirements |
| Glass passivated chip junction | Enhances long-term reliability and stability of breakdown voltage under thermal and humidity stress |
| Response time <1.0 ps | Clamps transients before sensitive ICs experience overvoltage damage, critical for CAN/LIN bus protection |
| ISO 7637-2 compliant | Withstands defined automotive load-dump and coupled transient pulses without degradation or failure |
| Moisture Sensitivity Level 1 | Enables direct placement into reflow soldering without pre-bake, reducing manufacturing complexity |
Applications
| Automotive Power Distribution Module | LED Headlamp Driver Circuit |
|---|---|
Use Scenario: Protecting 12 V supply lines in junction boxes from battery load-dump spikes up to 35 V. IC Role / Device Role / Timing Role: Unidirectional TVS placed between fused input and DC-DC converter input stage. Use Value: Clamps 10/1000 µs surges to ≤15.6 V, preventing latch-up or destruction of downstream PMICs and microcontrollers. | Use Scenario: Safeguarding LED driver ICs against ESD and inductive kickback from PWM-controlled buck converters. IC Role / Device Role / Timing Role: TVS mounted directly at driver IC input pins to minimize trace inductance. Use Value: Sub-1 ps response ensures clamping occurs before 10 ns edge rates of MOSFET gate drivers induce destructive voltage overshoot. |
| Body Control Module (BCM) Input Protection | Industrial Sensor Interface Board |
Use Scenario: Shielding LIN bus transceivers and microcontroller I/O from wiring harness coupling transients. IC Role / Device Role / Timing Role: Unidirectional TVS on each LIN signal line, referenced to local ground plane. Use Value: 9.40 V stand-off allows normal 12 V supply margin while clamping 24 V pulses to safe levels for 5 V tolerant transceivers. | Use Scenario: Protecting analog front-end inputs of 24 V industrial sensors exposed to field wiring transients. IC Role / Device Role / Timing Role: TVS placed at connector entry point before signal conditioning op-amps. Use Value: 1000 W peak power rating absorbs multiple 1 kV/500 Ω surges per IEC 61000-4-5 without parameter shift. |
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 VBR (10.5–11.6 V), but VC = 16.0 V @ 63.8 A and PPPM = 600 W | Lower peak power rating limits suitability for severe automotive load-dump scenarios requiring full 1000 W margin | Select 1KSMB11AH where ISO 7637-2 Pulse 5a (load dump) compliance is mandatory |
| P6SMB11A (Littelfuse) | Identical VBR, VWM, and VC; AEC-Q101 qualified; same 1000 W rating but MSL Level 2 (24 hr floor life) | Requires moisture-sensitive handling and bake prior to SMT, increasing production overhead | Choose 1KSMB11AH for simplified assembly flow and MSL Level 1 advantage in high-volume automotive lines |
Compared with SMBJ11A and P6SMB11A, the 1KSMB11AH delivers equal clamping performance with superior surge robustness (1000 W vs 600 W) and zero-moisture-handling overhead-critical for Tier 1 automotive module manufacturers prioritizing process yield and qualification continuity.
Availability
1KSMB11AH is available at Aetrix Electronics and suitable for automotive power distribution, LED lighting systems, body control modules, and industrial sensor interfaces requiring stable component supply across extended production lifecycles.
Supply support for 1KSMB11AH 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 automotive-qualified components.
The 1KSMBxxAH series is designed specifically for AEC-Q101-compliant transient suppression in 12 V and 24 V automotive subsystems, emphasizing high surge robustness, low clamping voltage, and SMT manufacturability.
FAQ
What is the clamping voltage of the 1KSMB11AH under maximum rated surge current?
The 1KSMB11AH has a maximum clamping voltage (VC) of 15.6 V when subjected to its peak impulse current (IPP) of 64.1 A under the standardized 10/1000 µs waveform. This value is measured at TA = 25°C and ensures downstream circuitry remains within safe operating voltage limits during transient events. The 1KSMB11AH maintains this clamping performance across its qualified temperature range.
Is the 1KSMB11AH suitable for bidirectional transient protection?
No, the 1KSMB11AH is a unidirectional TVS diode, intended for protection of DC circuits with defined polarity. For bidirectional applications such as AC lines or differential buses, the 1KSMB11CAH variant must be used. The "AH" suffix explicitly denotes unidirectional configuration, and its cathode band marking confirms polarity-dependent mounting orientation.
Does the 1KSMB11AH meet automotive qualification standards?
Yes, the 1KSMB11AH is AEC-Q101 qualified and meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements for automotive electrical system immunity. It is rated for operation from –55°C to +175°C junction temperature and packaged in MSL Level 1 DO-214AA (SMB) housing-key criteria for under-hood and powertrain applications.
What is the maximum steady-state power dissipation for the 1KSMB11AH?
The 1KSMB11AH has a steady-state power dissipation (PD) rating of 5 W at TA = 25°C. This value applies only to continuous DC or low-frequency reverse leakage conditions-not transient events. Under surge conditions, it relies on its 1000 W peak pulse rating (PPPSM) with appropriate thermal derating above ambient temperature per Figure 2 in the datasheet.
How is the 1KSMB11AH marked on the package?
The 1KSMB11AH is marked with code "A10F" on the DO-214AA (SMB) body, along with a cathode band indicating the cathode terminal. The marking follows Taiwan Semiconductor's standard format: alphanumeric code denoting voltage grade and polarity, plus green compound (G) and date code (YW). No functional or parametric values are printed directly on the device.
1KSMB11AH 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
1KSMB11AH FAQ
1.How can I place an order for 1KSMB11AH through Aetrix?
Please submit a Request for Quotation (RFQ) for 1KSMB11AH 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 1KSMB11AH reliable?
The price and inventory of 1KSMB11AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1KSMB11AH is usually 5 days.
3.What payment methods are accepted for 1KSMB11AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1KSMB11AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1KSMB11AH?
1KSMB11AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1KSMB11AH 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 1KSMB11AH?
For technical support, including 1KSMB11AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1KSMB11AH requirements.
6.How does Aetrix verify that 1KSMB11AH is sourced from the original manufacturer or authorized distributors?
All 1KSMB11AH 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 1KSMB11AH meets industry standards.
7.What is the process for return or replacement of 1KSMB11AH?
All 1KSMB11AH units undergo pre-shipment inspection (PSI). If there is an issue with 1KSMB11AH, 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 1KSMB11AH part is unused and in its original packaging.
Return procedure for 1KSMB11AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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