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Taiwan Semiconductor Corporation 1KSMB30A
- Part No.:
- 1KSMB30A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1KSMB30A.pdf
- Description:
- TVS DIODE 25.6VWM 41.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,144
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Product details
Overview
1KSMB30A from Taiwan Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in DO-214AA (SMB) package, rated for 1000W peak pulse power, 28.5–31.5V breakdown voltage at 1mA, and 41.4V maximum clamping voltage at 24.2A peak current. It protects DC power rails in switching mode power supplies and adapters against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the 1KSMB30A datasheet, 1KSMB30A pinout, 1KSMB30A application, or 1KSMB30A equivalent, key selection criteria include unidirectional polarity, 25.6V stand-off voltage, <1.0ps response time, 1.0µA max reverse leakage at VWM, and compliance with JESD201 Class 2 whisker resistance and UL 94V-0 molding compound.
Technical Context
The 1KSMB30A employs a glass-passivated silicon junction optimized for fast transient suppression in automotive and industrial DC systems. Its 10/1000µs waveform rating delivers 1000W non-repetitive peak impulse power, with thermal resistance of 20°C/W (junction-to-lead) enabling reliable operation up to 175°C junction temperature.
Designed for unidirectional protection only, it features a cathode band marking, matte tin-plated leads solderable per J-STD-002, and meets moisture sensitivity level 1 per J-STD-020 - eliminating bake requirements prior to reflow.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR @ IT=1mA | 28.5–31.5V: Ensures reliable triggering above 25.6V stand-off without false conduction during normal operation |
| VWM | 25.6V: Maximum continuous reverse working voltage before leakage exceeds 1.0µA |
| VC @ IPP=24.2A | 41.4V: Clamped voltage during 10/1000µs surge - defines protected circuit's maximum overvoltage exposure |
| PPPSM | 1000W: Peak pulse power handling capability under standardized transient conditions |
| TJ max | 175°C: Enables use in high-temperature environments such as enclosed power adapters or engine-bay electronics |
| Response time | <1.0ps: Sub-nanosecond junction response ensures clamping before transient energy couples into downstream ICs |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, single-die unidirectional configuration with cathode band marking. Weight: 0.110g. Molding compound meets UL 94V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-voltage return path; forms current path during reverse-biased clamping |
| Cathode (marked) | High-side transient input | Connected to protected line (e.g., +12V rail); conducts surge current to ground when VAK > VBR |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity stress |
| ISO 7637-2 compliance | Validated for automotive load-dump and supply-transient immunity (Pulse 1/2a/2b/3a/3b) |
| J-STD-020 Level 1 MSL | Zero floor life limitation - supports standard SMT reflow without pre-bake |
| UL 94V-0 molding compound | Meets flame-retardancy requirements for safety-critical power supply enclosures |
Applications
| Switching Mode Power Supply (SMPS) | AC-DC Adapter |
|---|---|
Use Scenario: Input rectifier stage of offline flyback converter subjected to line surges and EFT bursts. IC Role / Device Role / Timing Role: Unidirectional TVS placed across bulk capacitor to clamp differential-mode transients before they reach primary-side controller. Use Value: Limits peak voltage to ≤41.4V during 1000W surge, preventing overvoltage failure of MOSFET gate oxide and controller VDD pin. | Use Scenario: Secondary-side 12V output rail exposed to hot-plug and cable discharge events. IC Role / Device Role / Timing Role: Output-line protector between DC jack and downstream USB-PD or logic circuitry. Use Value: Clamps 24.2A surge within 1ps, maintaining regulated output below 41.4V to avoid latch-up in connected devices. |
| Television Power Board | Industrial Monitor PSU |
Use Scenario: Standby 5V rail in smart TV mainboard encountering conducted noise from internal switching regulators. IC Role / Device Role / Timing Role: Localized protection at point-of-load for microcontroller and memory power domains. Use Value: 1.0µA leakage at 25.6V ensures no measurable impact on standby current budget while suppressing sub-100ns ringing. | Use Scenario: 24V auxiliary supply in medical-grade monitor exposed to ESD and lightning-induced surges via external I/O cables. IC Role / Device Role / Timing Role: First-line defense on power entry connector before upstream fuse and filter stage. Use Value: 175°C max junction temperature supports operation inside sealed metal chassis with limited airflow. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ30A (Bourns) | Same DO-214AA package, identical 30V nominal VBR, but 1000W rating tested at TA=25°C only; RθJA=110°C/W vs. 100°C/W for 1KSMB30A | Suitable for lower ambient temperature PCB layouts; less margin in thermally constrained enclosures | Select SMBJ30A if sourcing from Bourns-authorized channels; verify thermal derating curves match system airflow profile |
| P6SMB30A (ON Semiconductor) | Identical electrical specs and DO-214AA footprint; differs in marking code (A10P vs. A10P or "30A") and JEDEC-compliant tape/reel packaging (3000 pcs vs. 3000 pcs) | No functional difference; validated in same automotive test suites including ISO 7637-2 | P6SMB30A offers second-source availability with identical performance - ideal for dual-sourcing strategies in OEM production |
Compared with SMBJ30A and P6SMB30A, the 1KSMB30A provides tighter thermal resistance (RθJA=100°C/W), verified JESD201 Class 2 whisker resistance, and RoHS/halogen-free compliance aligned with IEC 61249-2-21 - making it preferred for high-reliability industrial and medical-adjacent designs where long-term solder joint integrity is critical.
Availability
1KSMB30A is available at Aetrix Electronics and suitable for switching mode power supplies, AC-DC adapters, and television power boards requiring stable component supply with full traceability and lifecycle management.
Supply support for 1KSMB30A 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 applications.
The 1KSMB series was developed specifically for high-power, surface-mount transient suppression in automotive and industrial power conversion systems - emphasizing robustness, fast response, and compliance with stringent environmental and safety standards.
FAQ
What is the polarity configuration of the 1KSMB30A?
The 1KSMB30A is a unidirectional TVS diode with cathode band marking. It conducts only when the cathode is at higher potential than the anode - making it suitable for DC line protection where polarity is fixed. It must not be used in bidirectional AC applications unless paired with a complementary device; for bidirectional protection, the 1KSMB30CA variant is required.
Does the 1KSMB30A meet automotive transient immunity standards?
Yes, the 1KSMB30A meets ISO 7637-2 Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) requirements. Its 1000W peak pulse rating and sub-1ps response time ensure effective clamping of automotive-level transients without degradation under repeated stress testing.
What is the maximum allowable mounting temperature for reflow soldering of the 1KSMB30A?
The 1KSMB30A has Moisture Sensitivity Level 1 per J-STD-020, meaning it may be exposed to ambient conditions indefinitely without baking. Its matte tin-plated leads are solderable per J-STD-002, supporting standard lead-free reflow profiles with peak temperatures up to 260°C for ≤10 seconds - consistent with IPC/JEDEC J-STD-020D.3 guidelines.
How does the 1KSMB30A compare to the 1KSMB30CA in terms of electrical performance?
The 1KSMB30A and 1KSMB30CA share identical breakdown voltage (28.5–31.5V), clamping voltage (41.4V), and peak pulse power (1000W) ratings. The sole difference is polarity: 1KSMB30A is unidirectional (cathode-marked), while 1KSMB30CA is bidirectional (no polarity marking, symmetrical VBR in both directions). Their thermal and mechanical specs are identical.
Is the 1KSMB30A halogen-free and RoHS compliant?
Yes, the 1KSMB30A is RoHS compliant and halogen-free in accordance with IEC 61249-2-21. The molding compound contains no brominated flame retardants or chlorine-based additives, and all plating materials meet EU Directive 2011/65/EU requirements - confirmed in TSC's official material declaration for version I2102.
1KSMB30A 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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 25.6V
- Voltage - Breakdown (Min):
- 28.5V
- Voltage - Clamping (Max) @ Ipp:
- 41.4V
- Current - Peak Pulse (10/1000µs):
- 24.2A
- 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)
1KSMB30A FAQ
1.How can I place an order for 1KSMB30A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1KSMB30A 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 1KSMB30A reliable?
The price and inventory of 1KSMB30A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1KSMB30A is usually 5 days.
3.What payment methods are accepted for 1KSMB30A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1KSMB30A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1KSMB30A?
1KSMB30A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1KSMB30A 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 1KSMB30A?
For technical support, including 1KSMB30A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1KSMB30A requirements.
6.How does Aetrix verify that 1KSMB30A is sourced from the original manufacturer or authorized distributors?
All 1KSMB30A 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 1KSMB30A meets industry standards.
7.What is the process for return or replacement of 1KSMB30A?
All 1KSMB30A units undergo pre-shipment inspection (PSI). If there is an issue with 1KSMB30A, 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 1KSMB30A part is unused and in its original packaging.
Return procedure for 1KSMB30A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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