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Taiwan Semiconductor Corporation 1KSMB24CA
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- Part No.:
- 1KSMB24CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1KSMB24CA.pdf
- Description:
- TVS DIODE 20.5VWM 33.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,455
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Product details
Overview
1KSMB24CA from Taiwan Semiconductor is a bi-directional transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, rated for 1000W peak pulse power, 22.8V to 25.2V breakdown voltage (VBR), and 33.2V maximum clamping voltage (VC@IPP). It protects DC power rails and signal lines in switching mode power supplies, adapters, and display equipment against ESD and surge events per ISO 7637-2.
For engineers reviewing the 1KSMB24CA datasheet, 1KSMB24CA pinout, 1KSMB24CA application, or 1KSMB24CA equivalent, key selection criteria include bi-directional clamping capability, 1.0ps response time, 1000W 10/1000µs surge rating, TJ = –55°C to +175°C operating range, and RoHS/halogen-free compliance for industrial and consumer-grade power electronics.
Technical Context
The 1KSMB24CA employs a glass-passivated silicon junction optimized for fast transient suppression with sub-nanosecond response. Its bi-directional configuration enables symmetric clamping on AC-coupled or floating lines without polarity concerns.
It meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b waveforms and is rated for 1000W non-repetitive peak pulse power under 10/1000µs conditions. Thermal performance includes RθJL = 20°C/W and RθJA = 100°C/W, supporting reliable operation in compact surface-mount layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 22.8 V / 25.2 V - Ensures reliable triggering above 20.5 V stand-off voltage while maintaining margin against false triggering. |
| VC@IPP | 33.2 V - Limits downstream voltage stress during 30.1 A 10/1000µs surge, protecting 24 V nominal systems. |
| PPPSM | 1000 W - Sustains high-energy transients common in automotive load-dump and industrial switching noise. |
| IPP | 30.1 A - Peak current handling capacity at rated clamping voltage under standard 10/1000µs waveform. |
| VWM | 20.5 V - Maximum continuous reverse working voltage; sets upper limit for safe DC bias in protected circuits. |
| TJ max | +175 °C - Enables use in high-temperature environments such as enclosed power adapters or LED drivers. |
| Response time | <1.0 ps - Sub-nanosecond junction response ensures clamping before sensitive ICs experience overvoltage damage. |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, bi-directional device with cathode band omitted (no polarity marking required).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bi-directional TVS terminals | No functional distinction - either terminal accepts reverse or forward surge; bidirectional clamping across both polarities. |
| Case (cathode band absent) | Mechanical reference / thermal path | DO-214AA body provides mechanical anchoring and contributes to thermal dissipation via PCB copper area. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enhances long-term reliability and stability of VBR under thermal cycling and humidity exposure. |
| ISO 7637-2 compliance | Validated for automotive-level transient immunity (Pulse 1/2a/2b/3a/3b), enabling drop-in use in vehicle power modules. |
| Moisture sensitivity level 1 | Eliminates bake requirements prior to reflow; supports standard SMT assembly without special handling. |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU RoHS directives, suitable for export-compliant consumer and industrial products. |
| 1000W 10/1000µs rating | Provides robust protection against high-energy surges in SMPS input stages and DC bus lines without derating at 25°C. |
Applications
| Switching Mode Power Supply (SMPS) | AC-DC Adapters |
|---|---|
Use Scenario: Input rectifier stage and DC bus lines exposed to line transients and load-switching spikes. IC Role / Device Role: Bi-directional voltage clamp limiting surge-induced overvoltage on bulk capacitors and controller ICs. Use Value: Prevents premature failure of MOSFETs and PWM controllers by clamping 1000W surges to ≤33.2V in <1ps. | Use Scenario: Secondary-side output rails subject to ESD and hot-plug transients during USB-C or barrel-jack connection. IC Role / Device Role: Low-capacitance TVS placed directly at connector interface to shunt fast transients before regulation circuitry. Use Value: Maintains stable 24 V output integrity with 20.5 V working voltage margin and no polarity constraints. |
| Flat Panel Display Power | Industrial Control I/O Modules |
Use Scenario: Backlight inverter supply and logic rail inputs in LCD/LED monitors subjected to ESD and cable discharge events. IC Role / Device Role: Bi-directional protection element on 24 V bias rails feeding timing controllers and gate drivers. Use Value: Clamps ±33.2 V peaks without forward conduction loss, preserving signal integrity and reducing system reset risk. | Use Scenario: Digital input channels receiving 24 V dry-contact signals in PLCs and sensor interfaces vulnerable to field wiring surges. IC Role / Device Role: Front-end transient suppressor on isolated or non-isolated digital inputs to prevent latch-up in microcontrollers. Use Value: Withstands repeated 30.1 A surges while maintaining 1 µA leakage at 20.5 V, ensuring low standby power impact. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24CA (Bourns) | Same DO-214AA package, identical 24 V nominal rating, but VBR min = 26.7 V and VC = 38.9 V - higher clamping voltage. | Less effective clamping headroom in 24 V systems near absolute maximum ratings. | Select when higher VBR margin is preferred over lowest possible VC. |
| P6SMB24CA (ON Semiconductor) | Identical electrical specs (VBR: 22.8–25.2 V, VC: 33.2 V, PPPM: 1000 W) and DO-214AA package; minor differences in leakage (<5 µA vs. 1 µA). | No functional substitution impact; validated in same automotive and industrial designs. | Drop-in alternative where second-source qualification is required without layout or performance change. |
Compared with SMBJ24CA and P6SMB24CA, the 1KSMB24CA offers the tightest VBR tolerance (±5%) and lowest specified VC among 24 V bi-directional SMB TVS diodes, making it optimal for 24 V systems requiring minimal clamping overshoot and high surge margin.
Availability
1KSMB24CA is available at Aetrix Electronics and suitable for switching mode power supplies, AC-DC adapters, and flat panel display power systems requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for 1KSMB24CA 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 1KSMB series is designed specifically for high-reliability, surface-mount transient suppression in space-constrained power conversion and interface applications, emphasizing robustness, fast response, and automotive-grade surge compliance.
FAQ
What is the breakdown voltage range of the 1KSMB24CA?
The 1KSMB24CA has a guaranteed breakdown voltage (VBR) range of 22.8 V to 25.2 V at 1.0 mA test current, measured per ANSI/IEEE C62.35. This range ensures consistent triggering behavior across production lots while maintaining sufficient margin above its 20.5 V stand-off voltage (VWM) for reliable operation in 24 V systems.
Is the 1KSMB24CA unidirectional or bi-directional?
The 1KSMB24CA 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 without polarity dependence, making it ideal for AC-coupled lines, floating grounds, or differential signal protection where direction cannot be assumed.
What is the maximum clamping voltage of the 1KSMB24CA under surge conditions?
The 1KSMB24CA exhibits a maximum clamping voltage (VC) of 33.2 V at 30.1 A peak pulse current (IPP) under the standard 10/1000 µs waveform. This value defines the highest voltage seen downstream during worst-case surge events and is critical for ensuring protected ICs remain within their absolute maximum ratings.
Does the 1KSMB24CA require special handling during PCB assembly?
No - the 1KSMB24CA has a moisture sensitivity level (MSL) of 1 per J-STD-020, meaning it can be stored indefinitely at ambient conditions and placed directly into standard reflow profiles without baking or dry-pack requirements. Its matte tin-plated leads also comply with J-STD-002 for solderability assurance.
Can the 1KSMB24CA be used in automotive applications?
Yes - the 1KSMB24CA meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements and operates from –55°C to +175°C, satisfying key environmental and surge immunity needs for automotive body electronics, infotainment power supplies, and ADAS module interfaces, provided system-level validation is completed.
1KSMB24CA 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):
- 20.5V
- Voltage - Breakdown (Min):
- 22.8V
- Voltage - Clamping (Max) @ Ipp:
- 33.2V
- Current - Peak Pulse (10/1000µs):
- 30.1A
- 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)
1KSMB24CA FAQ
1.How can I place an order for 1KSMB24CA through Aetrix?
Please submit a Request for Quotation (RFQ) for 1KSMB24CA 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 1KSMB24CA reliable?
The price and inventory of 1KSMB24CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1KSMB24CA is usually 5 days.
3.What payment methods are accepted for 1KSMB24CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1KSMB24CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1KSMB24CA?
1KSMB24CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1KSMB24CA 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 1KSMB24CA?
For technical support, including 1KSMB24CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1KSMB24CA requirements.
6.How does Aetrix verify that 1KSMB24CA is sourced from the original manufacturer or authorized distributors?
All 1KSMB24CA 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 1KSMB24CA meets industry standards.
7.What is the process for return or replacement of 1KSMB24CA?
All 1KSMB24CA units undergo pre-shipment inspection (PSI). If there is an issue with 1KSMB24CA, 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 1KSMB24CA part is unused and in its original packaging.
Return procedure for 1KSMB24CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1KSMB24CA Tags
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