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Taiwan Semiconductor Corporation 1KSMB51CA
- Part No.:
- 1KSMB51CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1KSMB51CA.pdf
- Description:
- TVS DIODE 43.6VWM 70.1VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,387
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Product details
Overview
1KSMB51CA from Taiwan Semiconductor is a bi-directional 1000W transient voltage suppressor (TVS) in DO-214AA (SMB) package, with breakdown voltage 48.5–53.6 V at 1 mA, stand-off voltage 43.6 V, clamping voltage 70.1 V at 14.3 A, and operating junction temperature range −55 °C to +175 °C. It protects power inputs and data lines in switching mode power supplies, adapters, and display equipment against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the 1KSMB51CA datasheet, 1KSMB51CA pinout, 1KSMB51CA application, or 1KSMB51CA equivalent, key selection criteria include bidirectional clamping capability, 1000W peak pulse power rating, 70.1 V max clamping voltage at 14.3 A, DO-214AA mechanical compatibility, and compliance with J-STD-020 moisture sensitivity level 1.
Technical Context
The 1KSMB51CA uses a glass passivated silicon junction optimized for fast transient response (<1.0 ps from 0 V to VBR(min)) and robust clamping under repetitive surge stress. Its bi-directional configuration enables symmetrical protection of AC-coupled or floating signal paths without polarity dependency.
Designed per ANSI/IEEE C62.35, it delivers 1000 W non-repetitive peak pulse power (10/1000 µs waveform), with thermal resistance RθJL = 20 °C/W and RθJA = 100 °C/W. It meets ISO 7637-2 for automotive load dump and supply line transients, and supports automated SMT placement with matte tin-plated leads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR min/max | 48.5 V / 53.6 V at 1 mA - defines reliable avalanche initiation threshold across production lot |
| VWM | 43.6 V - maximum continuous reverse working voltage before leakage exceeds 1 µA |
| VC @ IPP | 70.1 V at 14.3 A - clamping voltage limiting downstream circuit stress during 10/1000 µs surge |
| PPPSM | 1000 W - peak pulse power handling capacity under standardized transient waveform |
| TJ range | −55 °C to +175 °C - enables operation in under-hood automotive or industrial power supply environments |
| Package | DO-214AA (SMB) - surface-mount outline with 0.110 g mass, UL 94V-0 molding, and JESD 201 Class 2 whisker resistance |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with cathode band marking; dual axial terminals; lead finish: matte tin per J-STD-002; polarity indicated by band (cathode for unidirectional variants; symmetric for bi-directional 1KSMB51CA).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional transient conduction path | No polarity dependence - either terminal serves as input/output for surge current in either direction |
| Case | Non-electrical mechanical interface | Plastic body provides insulation, thermal dissipation path to PCB copper, and UL 94V-0 flame resistance |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure |
| Sub-1 ps response time | Clamps transients before sensitive downstream ICs experience overvoltage stress |
| ISO 7637-2 compliance | Validated protection against automotive electrical disturbances including load dump and coupled pulses |
| Moisture sensitivity level 1 | Enables standard SMT reflow without baking or special handling prior to assembly |
Applications
| Switching Mode Power Supply (SMPS) | AC/DC Adapters |
|---|---|
Use Scenario: Input rectifier stage subjected to line surges and lightning-induced transients. IC Role / Device Role / Timing Role: Bi-directional TVS clamp limiting voltage across bulk capacitor and bridge rectifier. Use Value: Prevents overvoltage failure of electrolytic capacitors and MOSFETs by clamping to ≤70.1 V during 1000 W surges. | Use Scenario: Secondary-side DC output exposed to ESD and system-level coupling noise. IC Role / Device Role / Timing Role: Output rail protector absorbing fast transients before reaching USB or 5 V logic rails. Use Value: Maintains regulated output integrity with <1 µA leakage at 43.6 V, minimizing standby power loss. |
| Flat Panel TV Power Board | Monitor Backlight Inverter |
Use Scenario: Main 12 V/24 V distribution net encountering hot-swap and relay bounce transients. IC Role / Device Role / Timing Role: Primary-side rail protector placed upstream of DC-DC converters and microcontrollers. Use Value: Withstands repeated 14.3 A surges while maintaining <1 µA leakage, ensuring long-term stability in consumer displays. | Use Scenario: CCFL or LED driver input subjected to transformer ringing and open-circuit transients. IC Role / Device Role / Timing Role: Bidirectional clamp across high-frequency AC drive lines to suppress ringing overshoot. Use Value: Symmetrical clamping eliminates need for dual unidirectional devices, reducing BOM count and layout area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51CA (Bourns) | Same DO-214AA package; VBR = 53.6–59.3 V; VC = 82.4 V at 12.2 A; PPPM = 600 W | Lower peak power rating limits use in high-energy automotive load dump scenarios | Select when lower clamping voltage is less critical than cost or legacy design continuity |
| P6SMB51CA (ON Semiconductor) | Same DO-214AA package; VBR = 48.5–53.6 V; VC = 70.1 V at 14.3 A; PPPM = 600 W | Identical clamping but reduced 600 W rating requires derating in high-duty-cycle surge environments | Prefer where board space and footprint match but system-level surge energy is confirmed ≤600 W |
Compared with SMBJ51CA and P6SMB51CA, the 1KSMB51CA delivers full 1000 W peak pulse power in the same SMB footprint-enabling single-device protection in higher-energy applications like 24 V automotive ECUs or industrial SMPS without parallel devices or layout changes.
Availability
1KSMB51CA is available at Aetrix Electronics and suitable for switching mode power supplies, AC/DC adapters, and flat-panel display power boards requiring stable component supply, RoHS-compliant packaging, and ISO 7637-2 validated transient immunity.
Supply support for 1KSMB51CA 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, computing, and consumer markets.
The 1KSMBxxCA series targets high-reliability transient suppression in compact surface-mount applications, emphasizing automotive-grade surge immunity, automated assembly compatibility, and extended temperature operation.
FAQ
What is the breakdown voltage range for the 1KSMB51CA?
The 1KSMB51CA has a specified breakdown voltage range of 48.5 V to 53.6 V measured at 1 mA test current (IT), per ANSI/IEEE C62.35. This range ensures consistent avalanche triggering across manufacturing lots and temperature extremes, supporting reliable overvoltage protection in 48 V nominal systems.
Is the 1KSMB51CA unidirectional or bidirectional?
The 1KSMB51CA is a bidirectional TVS diode, indicated by the "CA" suffix per Taiwan Semiconductor's ordering convention. It provides symmetrical clamping for both positive and negative transients without polarity constraints, making it suitable for AC signal lines, floating buses, and differential interfaces where polarity is undefined.
What is the maximum clamping voltage of the 1KSMB51CA and at what current?
The 1KSMB51CA has a maximum clamping voltage (VC) of 70.1 V at a peak impulse current (IPP) of 14.3 A using the 10/1000 µs waveform. This value defines the upper voltage limit imposed on protected circuits during standardized surge events and is critical for ensuring downstream components remain within safe operating voltage margins.
Does the 1KSMB51CA meet automotive transient standards?
Yes, the 1KSMB51CA meets ISO 7637-2 requirements for Pulse 1, 2a, 2b, 3a, and 3b, covering common automotive electrical disturbances such as battery disconnect, inductive load switching, and capacitive coupling. Its 1000 W rating and −55 °C to +175 °C junction range support deployment in engine control units and body electronics modules.
What is the moisture sensitivity level (MSL) of the 1KSMB51CA?
The 1KSMB51CA is rated MSL Level 1 per J-STD-020, meaning it may be stored indefinitely at ambient conditions (≤30 °C / 60% RH) and subjected to standard SMT reflow profiles without pre-baking. This simplifies manufacturing logistics and eliminates moisture-related popcorning risk during assembly.
1KSMB51CA 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):
- 43.6V
- Voltage - Breakdown (Min):
- 48.5V
- Voltage - Clamping (Max) @ Ipp:
- 70.1V
- Current - Peak Pulse (10/1000µs):
- 14.3A
- 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)
1KSMB51CA FAQ
1.How can I place an order for 1KSMB51CA through Aetrix?
Please submit a Request for Quotation (RFQ) for 1KSMB51CA 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 1KSMB51CA reliable?
The price and inventory of 1KSMB51CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1KSMB51CA is usually 5 days.
3.What payment methods are accepted for 1KSMB51CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1KSMB51CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1KSMB51CA?
1KSMB51CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1KSMB51CA 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 1KSMB51CA?
For technical support, including 1KSMB51CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1KSMB51CA requirements.
6.How does Aetrix verify that 1KSMB51CA is sourced from the original manufacturer or authorized distributors?
All 1KSMB51CA 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 1KSMB51CA meets industry standards.
7.What is the process for return or replacement of 1KSMB51CA?
All 1KSMB51CA units undergo pre-shipment inspection (PSI). If there is an issue with 1KSMB51CA, 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 1KSMB51CA part is unused and in its original packaging.
Return procedure for 1KSMB51CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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