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Taiwan Semiconductor Corporation 1KSMB68A
- Part No.:
- 1KSMB68A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1KSMB68A.pdf
- Description:
- TVS DIODE 58.1VWM 92VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,192
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Product details
Overview
1KSMB68A from Taiwan Semiconductor is a unidirectional 1000W surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, with breakdown voltage 64.6–71.4 V, stand-off voltage 58.1 V, clamping voltage 92.0 V at 10.9 A, and fast response time <1.0 ps. 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 1KSMB68A datasheet, 1KSMB68A pinout, 1KSMB68A application, or 1KSMB68A equivalent, key selection criteria include unidirectional polarity, 1000W peak pulse power rating, 58.1 V working voltage, 92.0 V clamping performance at 10.9 A, and DO-214AA thermal resistance (RθJL = 20°C/W).
Technical Context
The 1KSMB68A uses a glass-passivated silicon junction to achieve stable avalanche breakdown and low leakage (<1.0 µA at VWM). Its unidirectional configuration enables integration into DC-biased lines where reverse conduction must be blocked until clamping threshold is exceeded.
Designed for automotive and industrial surge immunity, it meets ISO 7637-2 Pulse 1 (inductive load dump), Pulse 2a (sudden load disconnect), and Pulse 3a/3b (capacitive coupling transients), with junction temperature range –55°C to +175°C and moisture sensitivity level 1 per J-STD-020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR min/max | 64.6 V / 71.4 V - defines minimum and maximum voltage at which avalanche conduction begins under 1 mA test current |
| VWM | 58.1 V - maximum continuous reverse operating voltage before significant leakage occurs |
| VC @ IPP | 92.0 V at 10.9 A - clamping voltage during 10/1000 µs surge, limiting downstream voltage stress |
| PPPSM | 1000 W - peak pulse power handling capability under standardized 10/1000 µs waveform |
| IPP | 10.9 A - maximum non-repetitive peak surge current the device can safely divert |
| RθJL | 20 °C/W - junction-to-lead thermal resistance enabling effective heat transfer to PCB copper |
| TJ max | +175 °C - maximum allowable junction temperature, supporting high-ambient industrial operation |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, cathode-banded unidirectional configuration. Matte tin-plated leads, UL 94V-0 molding compound, 0.110 g weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path input | Connected to lower-potential side of protected line; conducts only during forward surge events |
| Cathode | Avalanche clamping node | Connected to higher-potential side; initiates clamping when reverse voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable VBR tolerance and long-term reliability under repeated surge stress |
| Response time <1.0 ps | Enables protection of fast-edge digital or analog signals before transient energy couples into ICs |
| ISO 7637-2 compliance | Validated for automotive-level load dump and coupling transients without external filtering |
| Moisture sensitivity level 1 | Eliminates bake requirements prior to reflow, supporting standard SMT assembly processes |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU directives for environmentally constrained applications |
Applications
| Switching Mode Power Supply (SMPS) | AC-DC Adapters |
|---|---|
Use Scenario: Input rectifier stage subjected to line surges and inductive kickback during AC mains switching. IC Role / Device Role / Timing Role: Unidirectional TVS placed across bulk capacitor to clamp positive-going transients above 58.1 V. Use Value: Limits voltage excursion to ≤92.0 V during 10.9 A surges, preventing overvoltage failure of primary-side MOSFETs and controllers. | Use Scenario: Secondary-side DC output exposed to ESD and load-dump coupling from connected devices. IC Role / Device Role / Timing Role: Standoff-rated TVS on regulated 12 V or 19 V rail to absorb fast transients before LDO or DC-DC converter input. Use Value: Clamps 1000 W pulses within 1 ps, maintaining output regulation integrity without requiring oversized capacitors or ferrites. |
| Flat Panel TV Power Board | Industrial Monitor DC Input |
Use Scenario: Main 24 V or 48 V DC input bus subject to cable discharge and nearby relay switching noise. IC Role / Device Role / Timing Role: Primary-line TVS between input connector and bulk filter, oriented anode-to-ground for unidirectional suppression. Use Value: Withstands repetitive 10/1000 µs surges up to 1000 W while maintaining <1.0 µA leakage at 58.1 V, preserving standby power budget. | Use Scenario: DIN-rail mounted monitor receiving power via long cables in factory environments with motor drives and solenoids. IC Role / Device Role / Timing Role: Input-stage protector rated for –55°C to +175°C junction operation, mounted directly on high-copper thermal pad. Use Value: RθJL = 20°C/W enables direct heat sinking to PCB, sustaining surge duty cycles without thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ64A (Bourns) | VBR = 71.1–78.6 V, VC = 103 V @ 9.7 A, same DO-214AA package | Higher clamping voltage reduces margin for 68 V nominal rails; suitable where system VMAX > 103 V | Select SMBJ64A only if layout allows higher clamping headroom and VWM ≥ 57.6 V is acceptable |
| 1.5SMC68A (ON Semiconductor) | VBR = 72.2–80.6 V, VC = 110 V @ 9.1 A, DO-214AB (SMC) package, larger footprint | Larger SMC package requires PCB redesign; higher VC demands greater downstream voltage margin | Choose 1.5SMC68A only when 1000 W rating must be retained with higher thermal mass and board space available |
Compared with SMBJ64A and 1.5SMC68A, the 1KSMB68A offers tighter VBR tolerance (64.6–71.4 V), lower clamping voltage (92.0 V), and optimal fit in space-constrained SMB layouts-making it preferred for compact 68 V rail protection where precise voltage limiting is critical.
Availability
1KSMB68A is available at Aetrix Electronics and suitable for switching mode power supplies, AC-DC adapters, and flat panel TV power boards requiring stable component supply with full traceability and lifecycle management.
Supply support for 1KSMB68A 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 was designed specifically for high-reliability, surface-mount transient suppression in harsh electromagnetic environments-emphasizing low clamping voltage, fast response, and robust thermal performance in compact SMB packages.
FAQ
What is the polarity configuration of the 1KSMB68A?
The 1KSMB68A is a unidirectional TVS diode with cathode band marking. It conducts only in reverse bias during overvoltage events and blocks forward current up to its rated IFSM of 100 A. This configuration is intended for DC lines where polarity is fixed and reverse conduction must be prevented outside clamping conditions. The 1KSMB68A datasheet specifies anode and cathode terminals explicitly in the DO-214AA outline.
Does the 1KSMB68A meet automotive surge standards?
Yes, the 1KSMB68A meets ISO 7637-2 Pulse 1 (inductive load dump), Pulse 2a (sudden supply disconnection), and Pulses 3a/3b (capacitive coupling transients). Its 1000 W peak pulse power rating and sub-1 ps response time are validated for these waveforms. The 1KSMB68A is commonly used in automotive infotainment power supplies and body control modules where such compliance is mandatory.
What is the maximum clamping voltage of the 1KSMB68A and at what current is it specified?
The maximum clamping voltage of the 1KSMB68A is 92.0 V, measured at a peak pulse current (IPP) of 10.9 A under the standardized 10/1000 µs waveform. This value is guaranteed across temperature and process variation and defines the upper voltage limit imposed on protected circuitry during surge events. The 1KSMB68A achieves this clamping performance while maintaining low leakage (<1.0 µA) at its 58.1 V stand-off voltage.
Can the 1KSMB68A be used in bidirectional applications?
No-the 1KSMB68A is unidirectional only. For bidirectional transient suppression, the pin-compatible 1KSMB68CA variant must be used. The 1KSMB68CA has identical VBR, VC, and power ratings but symmetrical breakdown in both polarities. Substituting 1KSMB68A in a bidirectional design risks failure during negative transients, as it lacks reverse avalanche capability. Always verify suffix 'A' (unidirectional) vs. 'CA' (bidirectional) when selecting the 1KSMB68A or its variants.
What is the thermal resistance and how does it affect PCB layout for the 1KSMB68A?
The 1KSMB68A has a junction-to-lead thermal resistance (RθJL) of 20°C/W, meaning each watt dissipated raises the junction temperature by 20°C above the lead temperature. To maximize surge endurance, PCB layout must provide low-thermal-resistance paths-such as wide copper pours connected to both leads-to dissipate heat rapidly. The 1KSMB68A's DO-214AA package relies on lead conduction rather than case convection, so thermal vias and copper area directly under the leads significantly improve performance during repetitive surge events.
1KSMB68A 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):
- 58.1V
- Voltage - Breakdown (Min):
- 64.6V
- Voltage - Clamping (Max) @ Ipp:
- 92V
- Current - Peak Pulse (10/1000µs):
- 10.9A
- 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)
1KSMB68A FAQ
1.How can I place an order for 1KSMB68A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1KSMB68A 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 1KSMB68A reliable?
The price and inventory of 1KSMB68A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1KSMB68A is usually 5 days.
3.What payment methods are accepted for 1KSMB68A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1KSMB68A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1KSMB68A?
1KSMB68A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1KSMB68A 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 1KSMB68A?
For technical support, including 1KSMB68A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1KSMB68A requirements.
6.How does Aetrix verify that 1KSMB68A is sourced from the original manufacturer or authorized distributors?
All 1KSMB68A 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 1KSMB68A meets industry standards.
7.What is the process for return or replacement of 1KSMB68A?
All 1KSMB68A units undergo pre-shipment inspection (PSI). If there is an issue with 1KSMB68A, 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 1KSMB68A part is unused and in its original packaging.
Return procedure for 1KSMB68A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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