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Taiwan Semiconductor Corporation 1KSMB11CAH
- Part No.:
- 1KSMB11CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1KSMB11CAH.pdf
- Description:
- TVS DIODE 9.4VWM 15.6VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,330
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Product details
Overview
1KSMB11CAH from Taiwan Semiconductor is a bi-directional 1000W transient voltage suppressor (TVS) diode 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 AEC-Q101 qualification for automotive-grade surge protection.
For engineers reviewing the 1KSMB11CAH datasheet, 1KSMB11CAH pinout, 1KSMB11CAH application, or 1KSMB11CAH equivalent, key selection factors include its bi-directional configuration, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, <1.0 ps response time, glass passivated junction, and moisture sensitivity level 1 - critical for automotive ECU and infotainment system design.
Technical Context
The 1KSMB11CAH is a single-die, bi-directional TVS diode designed to clamp fast-rising transients by avalanche breakdown in both polarities. Its 1000 W peak pulse power rating (10/1000 µs waveform), 20 °C/W junction-to-lead thermal resistance, and 175 °C max junction temperature support high-energy surge handling in compact surface-mount layouts.
It operates with 9.40 V stand-off voltage and clamps to ≤15.6 V at 64.1 A, delivering low-voltage protection for 12 V automotive rails. The device meets JESD201 Class 2 whisker resistance and UL 94V-0 molding compound requirements, enabling reliable automated placement and reflow compatibility.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 10.5 V / 11.6 V @ 1 mA - defines minimum and maximum guaranteed avalanche initiation voltage across production lot |
| VWM | 9.40 V - maximum continuous reverse working voltage before leakage exceeds 5 µA |
| IPP | 64.1 A (10/1000 µs) - peak transient current it can safely shunt without degradation |
| VC@IPP | 15.6 V - clamped voltage seen by protected circuit during full-rated surge event |
| PPPSM | 1000 W - peak pulse power dissipation capability under standardized surge waveform |
| TJ max | +175 °C - enables operation in under-hood automotive environments without derating |
| Package | DO-214AA (SMB) - industry-standard surface-mount outline with 0.110 g mass and J-STD-002 solderability |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with matte tin-plated leads, cathode band marking for polarity identification (bi-directional devices use symmetrical marking per datasheet note); weight ≈ 0.110 g; UL 94V-0 rated compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bi-directional avalanche junction terminals | No functional polarity - either terminal accepts reverse or forward surge; marked with cathode band for orientation reference only |
| Case (body) | Non-electrical mechanical interface | Provides thermal path to PCB copper; no electrical connection; conforms to JEDEC DO-214AA outline dimensions |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive electronics per stress test requirements including temperature cycling, HTRB, and ESD - required for ECU, body control, and ADAS modules |
| Glass passivated chip junction | Enhances long-term reliability and moisture resistance vs. epoxy-passivated alternatives - critical for high-humidity under-dash environments |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Guarantees robustness against real-world automotive load dump, jump-start, and inductive switching transients per international standard |
| Response time <1.0 ps | Enables clamping before sensitive downstream ICs (e.g., CAN transceivers, microcontrollers) experience overvoltage damage |
| Moisture sensitivity level 1 | Eliminates need for baking prior to reflow - supports direct SMT assembly without process interruption or yield loss |
Applications
| Automotive Body Control Module (BCM) | Infotainment System Power Input |
|---|---|
Use Scenario: Protecting 12 V supply rail from load dump and alternator ripple in BCM units. IC Role / Device Role / Timing Role: Bi-directional TVS clamping transient energy before it reaches MCU, LIN transceivers, and power management ICs. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V logic domains during 120 V/500 ms load dump events per ISO 7637-2 Pulse 5a. | Use Scenario: Safeguarding USB-C PD and display power inputs against ESD and cable-induced surges. IC Role / Device Role / Timing Role: First-line transient suppression at board edge connectors before DC-DC converters and PMICs. Use Value: Limits clamped voltage to ≤15.6 V, keeping input stage MOSFETs and gate drivers within safe SOA during ±8 kV contact ESD (IEC 61000-4-2). |
| LED Headlamp Driver Circuit | Industrial CAN Bus Node Protection |
Use Scenario: Shielding constant-current LED driver ICs from inductive kickback during PWM dimming. IC Role / Device Role / Timing Role: Parallel-connected TVS absorbing flyback energy from boost inductor and MOSFET switch node. Use Value: Clamps voltage spikes to ≤15.6 V, preventing gate oxide rupture in high-side N-channel MOSFETs operating at 12 V nominal. | Use Scenario: Protecting CAN FD transceivers (e.g., TCAN1042) on vehicle network nodes from EFT and burst noise. IC Role / Device Role / Timing Role: Low-capacitance bi-directional suppression on CAN_H/CAN_L differential pair. Use Value: Maintains signal integrity with minimal added capacitance while meeting IEC 61000-4-4 Level 4 (4 kV) EFT immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ11CA | Same DO-214AA package, identical VBR (10.5–11.6 V), but lower PPPSM = 600 W and higher VC = 18.2 V at same IPP | Not suitable for ISO 7637-2 Pulse 5a load dump; limited to lower-energy ESD/EFT scenarios | Select 1KSMB11CAH when 1000 W surge rating and ≤15.6 V clamping are mandatory for automotive front-end protection. |
| 1.5KE11CA | Higher PPPSM = 1500 W but axial DO-15 package - incompatible with automated SMT assembly and board space constraints | Requires through-hole rework or adapter; unsuitable for high-density automotive PCBs | Choose 1KSMB11CAH for surface-mount scalability, AEC-Q101 compliance, and SMB footprint compatibility. |
Compared with SMBJ11CA and 1.5KE11CA, the 1KSMB11CAH uniquely delivers 1000 W surge capability in an AEC-Q101 qualified, moisture-level-1 SMB package with the lowest clamping voltage (15.6 V) in its voltage class - making it optimal for space-constrained, high-reliability automotive power rail protection.
Availability
1KSMB11CAH is available at Aetrix Electronics and suitable for automotive body control modules, infotainment power inputs, and LED headlamp driver circuits requiring stable component supply, AEC-Q101 traceability, and ISO 7637-2 compliance.
Supply support for 1KSMB11CAH 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 since 1979.
The 1KSMBxxCAH series is part of TSC's AEC-Q101-certified TVS portfolio, engineered specifically for robust transient suppression in 12 V and 24 V automotive electrical systems - emphasizing low clamping voltage, fast response, and high surge endurance.
FAQ
What does the 'CAH' suffix indicate in 1KSMB11CAH?
The 'CAH' suffix in 1KSMB11CAH denotes bi-directional configuration, meaning the device provides symmetric transient suppression for both positive and negative voltage excursions. This distinguishes it from uni-directional variants (e.g., 1KSMB11AH) and ensures compatibility with AC-coupled or floating signal lines such as CAN bus pairs or sensor interfaces where polarity reversal may occur. The 1KSMB11CAH achieves this using a single die with back-to-back avalanche junctions.
Is 1KSMB11CAH suitable for protecting a 12 V automotive microcontroller power supply?
Yes, the 1KSMB11CAH is explicitly designed for this use case: its 9.40 V stand-off voltage allows normal 12 V rail operation while clamping transients to ≤15.6 V at 64.1 A, well within the absolute maximum ratings of most 12 V-input PMICs and MCUs. It meets ISO 7637-2 Pulse 1 (inductive load dump) and Pulse 3b (capacitive coupling), making it appropriate for protecting microcontroller power domains in body control or gateway modules.
How does the 1KSMB11CAH compare to standard SMBJ-series TVS diodes in surge handling?
The 1KSMB11CAH delivers 1000 W peak pulse power (10/1000 µs), versus 600 W for SMBJ11CA - a 67% increase. Its clamping voltage is also lower (15.6 V vs. 18.2 V at rated IPP), reducing stress on downstream components. Both share DO-214AA packaging, but only the 1KSMB11CAH carries AEC-Q101 qualification and ISO 7637-2 certification, confirming suitability for automotive front-end protection where SMBJ11CA may require additional validation.
Does 1KSMB11CAH require special PCB layout considerations?
Yes - to preserve its <1.0 ps response time and low clamping performance, minimize trace inductance between the 1KSMB11CAH and protected node. Use short, wide traces (<5 mm), place directly at the connector or IC power pin, and connect cathode/anode pads to solid ground/power planes. Avoid vias in the main current path. The DO-214AA footprint must follow TSC's suggested pad layout (document version A2102) to ensure thermal relief and solder joint reliability during reflow.
What is the maximum operating temperature range for 1KSMB11CAH?
The 1KSMB11CAH has a specified junction temperature range of –55 °C to +175 °C, with derating applied above 25 °C ambient per the pulse derating curve (Fig. 2). At 100 °C ambient, its 1000 W peak pulse rating reduces to approximately 600 W. This extended range supports under-hood deployment in engine control units and lighting modules where ambient temperatures exceed 85 °C, provided thermal design accounts for RθJA = 100 °C/W and RθJL = 20 °C/W.
1KSMB11CAH 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
1KSMB11CAH FAQ
1.How can I place an order for 1KSMB11CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for 1KSMB11CAH 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 1KSMB11CAH reliable?
The price and inventory of 1KSMB11CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1KSMB11CAH is usually 5 days.
3.What payment methods are accepted for 1KSMB11CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1KSMB11CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1KSMB11CAH?
1KSMB11CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1KSMB11CAH 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 1KSMB11CAH?
For technical support, including 1KSMB11CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1KSMB11CAH requirements.
6.How does Aetrix verify that 1KSMB11CAH is sourced from the original manufacturer or authorized distributors?
All 1KSMB11CAH 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 1KSMB11CAH meets industry standards.
7.What is the process for return or replacement of 1KSMB11CAH?
All 1KSMB11CAH units undergo pre-shipment inspection (PSI). If there is an issue with 1KSMB11CAH, 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 1KSMB11CAH part is unused and in its original packaging.
Return procedure for 1KSMB11CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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