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Taiwan Semiconductor Corporation 1KSMB20CA
- Part No.:
- 1KSMB20CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1KSMB20CA.pdf
- Description:
- TVS DIODE 17.1VWM 27.7VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,760
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Product details
Overview
1KSMB20CA from Taiwan Semiconductor is a bi-directional 1000W transient voltage suppressor (TVS) in DO-214AA (SMB) package, with 19.0–21.0 V breakdown voltage (VBR), 17.1 V stand-off voltage (VWM), and 27.7 V clamping voltage (VC) at 36.1 A peak pulse current. It meets ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive electronics protection.
For engineers reviewing the 1KSMB20CA datasheet, 1KSMB20CA pinout, 1KSMB20CA application, or 1KSMB20CA equivalent, key selection criteria include bi-directional surge capability, 1000W peak pulse power rating, 1.0ps response time, DO-214AA thermal performance (RθJA = 100°C/W), and compliance with J-STD-020 moisture sensitivity level 1.
Technical Context
The 1KSMB20CA 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 bi-directional configuration enables symmetric protection of AC lines or differential signal paths without polarity dependency.
Designed for surface-mount automated placement, it supports high-reliability operation across –55°C to +175°C junction temperature range and delivers 27.7 V clamping at 36.1 A (10/1000 µs waveform), with <1.0 µA reverse leakage at 17.1 V stand-off voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 19.0 V / 21.0 V - defines minimum and maximum voltage at which device enters avalanche conduction under 1.0 mA test current |
| VWM | 17.1 V - maximum continuous reverse operating voltage before significant leakage begins |
| VC@IPP | 27.7 V @ 36.1 A - clamping voltage during 10/1000 µs surge, limiting downstream circuit stress |
| PPPSM | 1000 W - non-repetitive peak pulse power handling capability per ISO 7637-2 |
| TJ max | +175 °C - maximum junction temperature enabling use in high-ambient industrial or under-hood automotive environments |
| Package | DO-214AA (SMB) - standardized surface-mount outline with 0.110 g mass and UL 94V-0 molding compound |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band (not applicable for bi-directional 1KSMB20CA); meets JESD 201 Class 2 whisker resistance and J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bi-directional surge path | No polarity marking required; terminals interchangeable for AC or differential line protection |
| Case | Thermal and mechanical interface | Non-electrical; provides mechanical anchoring and contributes to RθJA = 100°C/W thermal resistance |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure |
| ISO 7637-2 compliance | Validated for automotive Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line spikes) |
| 1.0 ps response time | Enables suppression of ESD and fast-rising transients before sensitive downstream ICs experience overstress |
| Moisture sensitivity level 1 | Allows unlimited floor life before reflow, eliminating bake requirements in SMT assembly |
| Halogen-free construction | Meets IEC 61249-2-21, supporting RoHS-compliant and environmentally regulated end equipment |
Applications
| Automotive Infotainment Power Rails | Industrial AC Motor Drive Inputs |
|---|---|
Use Scenario: Protection of 12 V supply inputs to head units and display modules against load dump and alternator ripple. IC Role / Device Role / Timing Role: Bi-directional TVS placed at board-level input filter stage to clamp transients before DC-DC converters. Use Value: 27.7 V clamping ensures downstream 3.3 V/5 V regulators remain within absolute maximum ratings during ISO 7637-2 Pulse 2b events. | Use Scenario: Surge suppression on single-phase AC input lines feeding variable frequency drives in factory automation. IC Role / Device Role / Timing Role: Primary overvoltage protection element bridging L-N and L/N-PE, absorbing switching surges from contactors and relays. Use Value: 1000 W peak power rating handles repetitive 10/1000 µs surges up to 36.1 A without degradation, extending system uptime. |
| Consumer Monitor Power Adapters | Medical Diagnostic Imaging Signal Interfaces |
Use Scenario: Input-stage protection in external 19 V adapters powering LCD monitors subject to mains-borne surges. IC Role / Device Role / Timing Role: Stand-off voltage (17.1 V) aligns with adapter output regulation margin while clamping above nominal rail. Use Value: <1.0 µA leakage at VWM prevents standby power loss, critical for Energy Star compliance. | Use Scenario: Transient protection on analog video or LVDS interfaces between imaging sensors and processing boards. IC Role / Device Role / Timing Role: Low-capacitance bi-directional clamp preserving signal integrity on high-speed differential pairs. Use Value: Symmetric clamping (±27.7 V) avoids DC offset shift in bipolar signal paths, maintaining dynamic range accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20CA (Bourns) | Same DO-214AA package, identical VBR (19.0–21.0 V), but higher VC = 32.4 V @ 31.0 A | Lower peak current handling (31.0 A vs. 36.1 A) reduces margin in high-energy surge environments | Select when footprint compatibility is mandatory and system-level clamping margin allows higher VC |
| P6SMB20CA (Littelfuse) | Identical electrical specs and DO-214AA package; differs in marking code and tape/reel packaging (3000 pcs vs. 5000 pcs standard) | No functional difference; validated for same ISO 7637-2 pulses and thermal derating profile | Drop-in alternative where supply chain diversification or distributor availability drives sourcing decisions |
Compared with SMBJ20CA and P6SMB20CA, the 1KSMB20CA offers the lowest clamping voltage (27.7 V) among DO-214AA bi-directional 20 V TVS diodes, delivering tighter overvoltage protection for voltage-sensitive loads without sacrificing surge current capacity.
Availability
1KSMB20CA is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial motor drives, and consumer power adapters requiring stable component supply and full ISO 7637-2 compliance.
Supply support for 1KSMB20CA 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 and automotive markets.
The 1KSMB series targets high-reliability transient suppression in space-constrained SMT applications, emphasizing robustness under automotive-grade thermal and surge stress conditions.
FAQ
What is the breakdown voltage range of the 1KSMB20CA?
The 1KSMB20CA has a guaranteed breakdown voltage range of 19.0 V to 21.0 V at 1.0 mA test current (VBR), measured per ANSI/IEEE C62.35. This range ensures consistent avalanche initiation across production lots and operating temperatures, critical for predictable clamping behavior in surge-prone systems.
Is the 1KSMB20CA unidirectional or bidirectional?
The 1KSMB20CA is a bi-directional TVS diode, indicated by the "CA" suffix per Taiwan Semiconductor's ordering convention. It provides symmetrical clamping for both positive and negative transients, making it suitable for AC line protection, differential data lines, and floating power rails where polarity is undefined or alternating.
What is the maximum clamping voltage of the 1KSMB20CA under surge conditions?
The 1KSMB20CA exhibits a maximum clamping voltage (VC) of 27.7 V when subjected to a 10/1000 µs waveform with a peak current (IPP) of 36.1 A. This value is measured at TA = 25°C and defines the upper voltage limit imposed on protected circuits during standardized surge events.
Does the 1KSMB20CA meet automotive surge immunity standards?
Yes, the 1KSMB20CA meets ISO 7637-2 requirements for Pulse 1 (inductive switch-off), Pulse 2a/2b (supply line transients), and Pulse 3a/3b (capacitive coupling), verified per Taiwan Semiconductor's characterization data. Its 1000 W peak pulse rating and fast response support robust protection in automotive ECUs and infotainment modules.
What is the thermal resistance of the 1KSMB20CA package?
The 1KSMB20CA in DO-214AA (SMB) package has a junction-to-ambient thermal resistance (RθJA) of 100°C/W and junction-to-lead resistance (RθJL) of 20°C/W. These values enable effective heat dissipation during transient events and define safe operating area limits under sustained power dissipation conditions.
1KSMB20CA 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):
- 17.1V
- Voltage - Breakdown (Min):
- 19V
- Voltage - Clamping (Max) @ Ipp:
- 27.7V
- Current - Peak Pulse (10/1000µs):
- 36.1A
- 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)
1KSMB20CA FAQ
1.How can I place an order for 1KSMB20CA through Aetrix?
Please submit a Request for Quotation (RFQ) for 1KSMB20CA 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 1KSMB20CA reliable?
The price and inventory of 1KSMB20CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1KSMB20CA is usually 5 days.
3.What payment methods are accepted for 1KSMB20CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1KSMB20CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1KSMB20CA?
1KSMB20CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1KSMB20CA 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 1KSMB20CA?
For technical support, including 1KSMB20CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1KSMB20CA requirements.
6.How does Aetrix verify that 1KSMB20CA is sourced from the original manufacturer or authorized distributors?
All 1KSMB20CA 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 1KSMB20CA meets industry standards.
7.What is the process for return or replacement of 1KSMB20CA?
All 1KSMB20CA units undergo pre-shipment inspection (PSI). If there is an issue with 1KSMB20CA, 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 1KSMB20CA part is unused and in its original packaging.
Return procedure for 1KSMB20CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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