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Taiwan Semiconductor Corporation 1KSMB18CA
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- Part No.:
- 1KSMB18CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1KSMB18CA.pdf
- Description:
- TVS DIODE 15.3VWM 25.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,820
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Product details
Overview
1KSMB18CA from Taiwan Semiconductor is a bidirectional 1000W transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, with breakdown voltage 17.1–18.9 V at 1 mA, clamping voltage 25.5 V at 39.2 A peak pulse current, and operating 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 1KSMB18CA datasheet, 1KSMB18CA pinout, 1KSMB18CA application, or 1KSMB18CA equivalent, key selection criteria include bidirectional clamping capability, 1000W peak pulse power rating, DO-214AA mechanical compatibility, moisture sensitivity level 1, and compliance with RoHS and halogen-free standards per IEC 61249-2-21.
Technical Context
The 1KSMB18CA is a glass-passivated, single-die, bidirectional TVS diode designed for unidirectional or bidirectional surge suppression in DC circuits. Its fast response time (<1.0 ps from 0 V to VBR(min)) enables effective clamping of fast-rising transients such as ESD and load dump events.
It meets ISO 7637-2 test requirements for automotive electronics (Pulse 1, 2a, 2b, 3a, 3b), operates across −55 °C to +175 °C junction temperature, and features matte tin-plated leads compliant with J-STD-002 solderability and JESD 201 Class 2 whisker resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 17.1 V / 18.9 V at 1 mA - defines minimum and maximum guaranteed breakdown threshold under standardized test conditions |
| VWM | 15.3 V - maximum continuous reverse working voltage before leakage exceeds 1 µA |
| VC@IPP | 25.5 V at 39.2 A - clamping voltage during 10/1000 µs surge, limiting downstream voltage stress |
| PPPSM | 1000 W - peak pulse power handling capacity for non-repetitive 10/1000 µs waveform |
| Junction temp. (TJ) | −55 °C to +175 °C - enables use in under-hood automotive and industrial power supply environments |
| Package | DO-214AA (SMB) - surface-mount outline with 0.110 g mass, UL 94V-0 molding compound |
| Mechanical polarity | Cathode band marked - identifies terminal orientation for correct PCB placement and circuit integration |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with two coplanar leads, cathode band marking on one end, lead finish matte tin, weight ≈ 0.110 g, UL 94V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Current entry point in forward bias; common node in bidirectional clamp | Connected to protected line when used in symmetrical surge protection configuration |
| Cathode (banded end) | Current exit point in forward bias; common node in bidirectional clamp | Provides polarity reference for layout verification and automated optical inspection (AOI) |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Enables stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure |
| Fast response time <1.0 ps | Clamps sub-nanosecond ESD events before sensitive ICs experience overstress |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validated for automotive power line surge immunity without additional filtering components |
| Moisture sensitivity level 1 | Eliminates bake-out requirement prior to reflow, reducing manufacturing cost and cycle time |
| RoHS & halogen-free | Meets global environmental regulations including IEC 61249-2-21 for printed wiring board assembly |
Applications
| Switching Mode Power Supply (SMPS) | Consumer Display (TV/Monitor) |
|---|---|
Use Scenario: Input rectifier stage of offline AC/DC converters subjected to line surges and lightning-induced transients. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across bulk capacitor or input bridge output to limit transient overvoltage. Use Value: Limits peak voltage to ≤25.5 V during 10/1000 µs surges, protecting MOSFETs and controller ICs rated for 30 V max. | Use Scenario: DC power rail protection in LCD backlight drivers and mainboard power distribution networks. IC Role / Device Role / Timing Role: Standoff-rated TVS connected between 12 V or 24 V supply and ground to absorb coupling noise and hot-swap spikes. Use Value: Withstands ≥39.2 A peak impulse current while holding clamped voltage below 25.5 V, preventing latch-up in display timing controllers. |
| Automotive Body Control Module | Industrial AC-DC Adapter |
Use Scenario: Protection of LIN bus power lines and sensor supply rails exposed to load dump and jump-start transients. IC Role / Device Role / Timing Role: Bidirectional clamp on 12 V battery-fed rails meeting ISO 7637-2 Pulse 2b (load dump) and Pulse 3b (capacitive coupling). Use Value: Maintains clamping performance up to +175 °C junction temperature, supporting under-dash mounting without derating. | Use Scenario: Secondary-side DC output protection in universal-input adapters for medical and office equipment. IC Role / Device Role / Timing Role: Final-stage surge limiter on regulated 5 V, 12 V, or 19 V outputs to meet IEC/EN 61000-4-5 Level 3 immunity. Use Value: Delivers 1000 W peak pulse power handling in compact SMB footprint, enabling high-density adapter PCB layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18CA (Bourns) | Same DO-214AA package, identical VBR (17.1–18.9 V), but higher VC = 28.7 V at 35.0 A | Lower peak current rating reduces margin in high-energy surge environments | Select when tighter VC tolerance is not required and second-source qualification is mandated |
| P6SMB18CA (Littelfuse) | Identical electrical specs and DO-214AA footprint; differs in marking code and tape/reel packaging (3000 vs. 5000 pcs/reel) | No functional difference; validated for same ISO 7637-2 pulses and thermal profiles | Preferred for high-volume automotive programs requiring Littelfuse QPL listing and PPAP documentation |
Compared with SMBJ18CA and P6SMB18CA, the 1KSMB18CA offers identical clamping performance and thermal robustness but delivers superior surge current margin (39.2 A vs. 35.0 A) and lower clamping voltage (25.5 V vs. 28.7 V), making it optimal for space-constrained, high-reliability DC rail protection where voltage headroom is critical.
Availability
1KSMB18CA is available at Aetrix Electronics and suitable for switching mode power supplies, consumer displays, and automotive body control modules requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for 1KSMB18CA 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, with ISO 9001 and IATF 16949 certified facilities.
The 1KSMBxxCA series is part of TSC's high-power SMB-format TVS portfolio, engineered specifically for robust, low-clamping protection of 12 V and 24 V DC systems in automotive, industrial, and consumer power electronics.
FAQ
What is the breakdown voltage range of the 1KSMB18CA?
The 1KSMB18CA has a guaranteed breakdown voltage range of 17.1 V to 18.9 V at a test current of 1 mA, measured per ANSI/IEEE C62.35. This range ensures consistent clamping behavior across production lots and supports reliable design margining for 15.3 V maximum working voltage applications.
Is the 1KSMB18CA suitable for automotive applications?
Yes, the 1KSMB18CA is explicitly qualified for automotive use: it meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements, operates from −55 °C to +175 °C junction temperature, and features JESD 201 Class 2 whisker-resistant matte tin plating - all confirmed in Taiwan Semiconductor's official datasheet revision I2102.
What does the 'CA' suffix indicate in 1KSMB18CA?
The 'CA' suffix in 1KSMB18CA denotes bidirectional configuration - meaning the device functions identically in both polarities, with symmetric breakdown and clamping characteristics. This eliminates polarity concerns during PCB layout and enables single-component protection of floating or AC-coupled signal/power lines.
What is the maximum clamping voltage of the 1KSMB18CA under surge conditions?
The 1KSMB18CA exhibits a maximum clamping voltage of 25.5 V when subjected to a 10/1000 µs surge waveform with a peak current of 39.2 A. This value is measured at TA = 25 °C and defines the upper voltage limit imposed on protected circuitry during worst-case transient events.
Does the 1KSMB18CA require special handling during PCB assembly?
No - the 1KSMB18CA has moisture sensitivity level (MSL) 1 per J-STD-020, meaning it can be stored indefinitely at ambient conditions and placed directly into standard lead-free reflow profiles without baking. Its matte tin leads also comply with J-STD-002 for solderability, eliminating pre-tinning or flux adjustment.
1KSMB18CA 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):
- 15.3V
- Voltage - Breakdown (Min):
- 17.1V
- Voltage - Clamping (Max) @ Ipp:
- 25.5V
- Current - Peak Pulse (10/1000µs):
- 39.2A
- 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)
1KSMB18CA FAQ
1.How can I place an order for 1KSMB18CA through Aetrix?
Please submit a Request for Quotation (RFQ) for 1KSMB18CA 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 1KSMB18CA reliable?
The price and inventory of 1KSMB18CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1KSMB18CA is usually 5 days.
3.What payment methods are accepted for 1KSMB18CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1KSMB18CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1KSMB18CA?
1KSMB18CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1KSMB18CA 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 1KSMB18CA?
For technical support, including 1KSMB18CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1KSMB18CA requirements.
6.How does Aetrix verify that 1KSMB18CA is sourced from the original manufacturer or authorized distributors?
All 1KSMB18CA 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 1KSMB18CA meets industry standards.
7.What is the process for return or replacement of 1KSMB18CA?
All 1KSMB18CA units undergo pre-shipment inspection (PSI). If there is an issue with 1KSMB18CA, 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 1KSMB18CA part is unused and in its original packaging.
Return procedure for 1KSMB18CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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