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Taiwan Semiconductor Corporation 1KSMB75A
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- Part No.:
- 1KSMB75A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1KSMB75A.pdf
- Description:
- TVS DIODE 64.1VWM 103VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,500
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Product details
Overview
1KSMB75A from Taiwan Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in DO-214AA (SMB) package, rated for 1000W peak pulse power, 71.3–78.8V breakdown voltage (VBR), and 103V maximum clamping voltage (VC@IPP) at 9.7A peak impulse current - deployed for overvoltage protection in switching mode power supplies and consumer display electronics.
For engineers reviewing the 1KSMB75A datasheet, 1KSMB75A pinout, 1KSMB75A application, or 1KSMB75A equivalent, key selection criteria include standoff voltage (64.1V), low leakage (<1µA @ VWM), fast sub-1ps response time, ISO 7637-2 compliance, and SMB package thermal performance (RθJA = 100°C/W).
Technical Context
The 1KSMB75A operates as a unidirectional avalanche diode with glass-passivated junction, designed to clamp transient surges on DC power rails by entering avalanche breakdown when reverse voltage exceeds VBR = 71.3–78.8V at IT = 1mA. Its clamping action limits downstream voltage to ≤103V under 10/1000µs waveform stress.
Thermal design relies on DO-214AA package characteristics: RθJL = 20°C/W enables effective heat transfer to PCB copper, while RθJA = 100°C/W defines ambient-limited power derating above 25°C per Fig.2. It meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 64.1 V - Maximum continuous reverse operating voltage before leakage rises; sets safe DC rail margin below breakdown. |
| VBR @ IT=1mA | 71.3–78.8 V - Measured breakdown range defining turn-on threshold for transient suppression. |
| VC @ IPP=9.7A | 103 V - Clamped voltage during 10/1000µs surge; determines maximum stress on protected ICs. |
| PPPSM | 1000 W - Peak pulse power handling capability per single non-repetitive transient event. |
| IPP | 9.7 A - Maximum peak impulse current supported at rated clamping voltage. |
| Junction Temp Range | −55°C to +175°C - Enables operation in industrial and automotive under-hood environments. |
| Response Time | <1.0 ps - Sub-picosecond junction response ensures suppression before sensitive circuitry is damaged. |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, cathode-banded unidirectional configuration. Matte tin-plated leads, UL 94V-0 molding compound, 0.110g mass.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | DC power rail reference node | Connected to ground or low-side return path; establishes forward bias directionality. |
| Cathode | Protected line input | Connected to supply rail (e.g., +12V, +24V); conducts avalanche current during overvoltage events. |
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 (Pulse 1/2a/2b/3a/3b) | Validated for automotive-level load dump and inductive switch-off transients without external filtering. |
| Fast response <1.0 ps | Prevents voltage overshoot propagation into downstream regulators, controllers, or interface ICs. |
| RoHS & halogen-free | Meets IEC 61249-2-21 and global environmental compliance requirements for industrial and consumer end equipment. |
| Level 1 moisture sensitivity | Enables standard SMT reflow without baking preconditioning, reducing manufacturing overhead. |
Applications
| Switching Mode Power Supply (SMPS) | AC-DC Adapter |
|---|---|
Use Scenario: Protects primary-side controller ICs and secondary-side rectifiers from line-induced surges and MOSFET switching spikes. IC Role / Device Role: Unidirectional TVS placed across bulk capacitor or output rail to clamp transient excursions. Use Value: Limits VC to 103V, ensuring protected MOSFETs and optocouplers remain within SOA during 1000W surge events. |
Use Scenario: Shields USB-PD or QC-compliant secondary-side regulation circuitry from ESD and conducted noise. IC Role / Device Role: Rail-to-ground clamping device on +5V/+9V/+12V output lines prior to connector interface. Use Value: Withstands >10,000 cycles of 1kV EFT per IEC 61000-4-4 due to low dynamic impedance and fast response. |
| Flat Panel TV Power Board | Monitor Backlight Inverter |
Use Scenario: Guards main 24V/48V logic and panel bias rails against lightning-induced surges coupled through AC mains input. IC Role / Device Role: Primary-side transient suppressor mounted near AC-DC converter output terminals. Use Value: Maintains VWM = 64.1V margin above nominal 48V rail, preventing false triggering during brownout or ripple conditions. |
Use Scenario: Safeguards CCFL or LED driver ICs from flyback voltage spikes generated during inverter transformer switching. IC Role / Device Role: Snubber-connected TVS across high-side switch drain or transformer secondary winding. Use Value: Clamps spike energy within 103V ceiling, avoiding gate oxide damage to driver FETs rated for 120V VDSS. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ75A (Bourns) | VBR = 78.8–87.0V; VC = 121V @ 8.3A; same DO-214AA package and 1000W rating. | Higher clamping voltage reduces margin for 100V-rated downstream components. | Select when higher VBR tolerance is acceptable and layout allows minor thermal adjustment. |
| 1.5SMC75A (ON Semiconductor) | VBR = 78.8–87.0V; VC = 121V @ 8.3A; DO-214AB (SMC) package - larger footprint and higher RθJA (75°C/W). | Requires PCB pad revision; better steady-state power dissipation (6.5W vs. 5W) but slower thermal response. | Choose only if existing design uses SMC footprint or requires higher continuous power handling. |
Compared with SMBJ75A and 1.5SMC75A, the 1KSMB75A offers tighter VBR spread (71.3–78.8V), lower clamping voltage (103V), and optimized thermal resistance for SMB-constrained layouts - making it preferable for space-limited, high-density power rail protection where precise voltage limiting is critical.
Availability
1KSMB75A 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, consistent parametric performance, and full traceability across production batches.
Supply support for 1KSMB75A 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, and power MOSFETs since 1979.
The 1KSMB series was developed specifically for high-reliability, surface-mount transient suppression in industrial power conversion and consumer electronics - emphasizing robustness, tight parameter distribution, and automotive-grade transient immunity.
FAQ
What is the polarity configuration of the 1KSMB75A?
The 1KSMB75A is a unidirectional TVS diode with cathode band marking indicating the terminal to be connected toward the protected positive rail. It conducts only during reverse overvoltage events and blocks forward current like a standard rectifier - unlike bidirectional variants (e.g., 1KSMB75CA) which suppress both polarities.
Does the 1KSMB75A meet automotive transient standards?
Yes, the 1KSMB75A meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements for automotive electrical systems. Its 1000W peak pulse rating and sub-1ps response ensure reliable suppression of load dump, inductive switching, and battery connection transients without external circuitry.
What is the maximum steady-state power dissipation for the 1KSMB75A?
The 1KSMB75A has a steady-state power dissipation (PD) of 5W at TA = 25°C. This value decreases linearly with ambient temperature per the derating curve in Figure 2, reaching zero at approximately 125°C ambient due to its RθJA = 100°C/W thermal resistance.
Can the 1KSMB75A be used in bidirectional signal line protection?
No - the 1KSMB75A is strictly unidirectional and unsuitable for AC or bidirectional data line protection. For such applications, use the pin-compatible bidirectional variant 1KSMB75CA, which features symmetrical breakdown in both directions and identical package and surge ratings.
What is the junction-to-lead thermal resistance (RθJL) of the 1KSMB75A?
The 1KSMB75A has a typical junction-to-lead thermal resistance (RθJL) of 20°C/W, measured from die to solder joint. This low value supports efficient heat conduction into PCB copper pours, enabling sustained operation under repetitive surge conditions when adequate copper area is provided.
1KSMB75A 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):
- 64.1V
- Voltage - Breakdown (Min):
- 71.3V
- Voltage - Clamping (Max) @ Ipp:
- 103V
- Current - Peak Pulse (10/1000µs):
- 9.7A
- 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)
1KSMB75A FAQ
1.How can I place an order for 1KSMB75A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1KSMB75A 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 1KSMB75A reliable?
The price and inventory of 1KSMB75A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1KSMB75A is usually 5 days.
3.What payment methods are accepted for 1KSMB75A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1KSMB75A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1KSMB75A?
1KSMB75A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1KSMB75A 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 1KSMB75A?
For technical support, including 1KSMB75A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1KSMB75A requirements.
6.How does Aetrix verify that 1KSMB75A is sourced from the original manufacturer or authorized distributors?
All 1KSMB75A 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 1KSMB75A meets industry standards.
7.What is the process for return or replacement of 1KSMB75A?
All 1KSMB75A units undergo pre-shipment inspection (PSI). If there is an issue with 1KSMB75A, 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 1KSMB75A part is unused and in its original packaging.
Return procedure for 1KSMB75A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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