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Taiwan Semiconductor Corporation 1KSMB51A
- Part No.:
- 1KSMB51A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1KSMB51A.pdf
- Description:
- TVS DIODE 43.6VWM 70.1VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,941
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Product details
Overview
1KSMB51A from Taiwan Semiconductor is a unidirectional 1000W surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, with breakdown voltage 48.5–53.6 V, 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 DC power rails in switching mode power supplies, adapters, and display electronics against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the 1KSMB51A datasheet, 1KSMB51A pinout, 1KSMB51A application, or 1KSMB51A equivalent, key selection criteria include unidirectional polarity, 1000 W peak pulse power rating, 70.1 V maximum clamping voltage at 14.3 A, DO-214AA mechanical compatibility, and compliance with J-STD-020 moisture sensitivity level 1 and IEC 61249-2-21 halogen-free requirements.
Technical Context
The 1KSMB51A uses a glass-passivated silicon junction to achieve fast transient response (<1.0 ps from 0 V to VBR(min)) and stable clamping under repetitive surge conditions. Its unidirectional configuration provides low forward voltage (3.5 V @ 50 A) and supports bidirectional protection only when paired with complementary devices.
Thermal performance is defined by RθJL = 20 °C/W and RθJA = 100 °C/W, enabling reliable operation up to 175 °C junction temperature. The device meets ISO 7637-2 for automotive load-dump and supply-line transient immunity without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR min/max | 48.5 V / 53.6 V - defines minimum and maximum voltage at which device enters avalanche conduction under 1 mA test current |
| VWM | 43.6 V - maximum continuous reverse working voltage before leakage exceeds 1 µA |
| VC @ IPP | 70.1 V @ 14.3 A - clamping voltage during 10/1000 µs surge, limiting downstream voltage stress |
| PPPSM | 1000 W - peak pulse power handling capability per single 10/1000 µs waveform |
| TJ max | +175 °C - maximum allowable junction temperature, supporting high-ambient industrial and automotive environments |
| IFSM | 100 A - peak forward surge current rating for 8.3 ms half-sine wave, critical for inrush and fault-current tolerance |
| Package | DO-214AA (SMB) - standardized surface-mount outline with 0.110 g mass and UL 94V-0 molding compound |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, cathode-banded unidirectional configuration. Matte tin-plated leads, J-STD-002 solderable, polarity marked by cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse voltage reference | Connected to lower-potential side of protected line; determines unidirectional blocking direction |
| Cathode | Avalanche conduction path / Clamping node | Connected to higher-potential rail; sinks surge current to ground or return path 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 |
| Response time <1.0 ps | Enables suppression of ultrafast ESD and lightning-induced transients before sensitive ICs are damaged |
| ISO 7637-2 compliance | Validates immunity to automotive electrical disturbances including load dump, battery reversal, and coupled transients |
| Moisture sensitivity level 1 | Eliminates need for dry-packaging or baking prior to reflow, reducing manufacturing overhead |
| Halogen-free construction | Meets IEC 61249-2-21 for environmentally compliant PCB assembly in regulated markets |
Applications
| Switching Mode Power Supply (SMPS) | AC-DC Adapters |
|---|---|
Use Scenario: Protection of primary-side rectifier output and secondary-side DC bus against input surges and transformer flyback spikes. IC Role / Device Role: Unidirectional TVS placed across bulk capacitor or post-rectifier nodes to clamp transient overvoltages. Use Value: Limits voltage excursion to ≤70.1 V during 1000 W surges, preventing MOSFET gate oxide rupture and controller latch-up. | Use Scenario: Input-stage surge suppression in wall-mounted AC-DC adapters subject to mains-borne transients per IEC 61000-4-5. IC Role / Device Role: Standoff-rated TVS on DC output lines to absorb coupling from primary-side transients and improve conducted emission margins. Use Value: Maintains 43.6 V working voltage margin while clamping 14.3 A surges within safe SOA limits of downstream LDOs and USB controllers. |
| Flat Panel TV Power Rails | Monitor Backlight Inverters |
Use Scenario: Protection of main 12 V/24 V logic and audio supply rails against ESD and hot-swap induced transients. IC Role / Device Role: Point-of-load TVS on board-level power distribution networks adjacent to microcontrollers and video processors. Use Value: Withstands repeated 10/1000 µs pulses up to 1000 W without parameter shift, ensuring field-reliability over 10-year product life. | Use Scenario: Clamping of high-voltage boost converter outputs feeding CCFL or LED backlight strings. IC Role / Device Role: Transient limiter on inverter secondary side to prevent arc-induced overvoltage damage to driver ICs and feedback sensors. Use Value: 70.1 V clamping voltage ensures backlight ICs remain below absolute maximum ratings even during open-circuit failure events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51A (Bourns) | Same DO-214AA package, identical VBR (48.5–53.6 V), but VC = 82.4 V @ 12.2 A and PPPM = 600 W | Lower peak power rating reduces margin for high-energy automotive load-dump events | Select 1KSMB51A when full 1000 W ISO 7637-2 Pulse 1/2b compliance is required |
| P6SMB51A (ON Semiconductor) | Same footprint and VBR, but VC = 71.4 V @ 14.0 A and RθJA = 110 °C/W (vs. 100 °C/W for 1KSMB51A) | Higher thermal resistance limits sustained surge duty cycle in compact enclosures | Prefer 1KSMB51A for thermally constrained designs requiring extended surge endurance at elevated ambient temperatures |
Compared with SMBJ51A and P6SMB51A, the 1KSMB51A delivers superior 1000 W peak power handling and lower thermal resistance (100 °C/W), making it better suited for high-reliability automotive and industrial power rail protection where transient energy and thermal management are critical.
Availability
1KSMB51A is available at Aetrix Electronics and suitable for switching mode power supplies, AC-DC adapters, and flat-panel display electronics requiring stable component supply, consistent parametric performance, and RoHS-compliant sourcing.
Supply support for 1KSMB51A 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 is designed specifically for high-energy transient suppression in surface-mount power conversion systems, emphasizing robustness, tight VBR tolerance, and automotive-grade reliability testing.
FAQ
What is the maximum clamping voltage of the 1KSMB51A under standard test conditions?
The 1KSMB51A has a maximum clamping voltage (VC) of 70.1 V when subjected to a 10/1000 µs surge current of 14.3 A. This value is measured at TA = 25 °C and defines the upper voltage limit imposed on protected circuits during transient events. The 1KSMB51A maintains this clamping performance consistently across its rated junction temperature range.
Is the 1KSMB51A suitable for bidirectional transient protection?
No, the 1KSMB51A is a unidirectional TVS diode and is not rated for bidirectional operation. For bidirectional protection, the 1KSMB51CA variant must be used. The "A" suffix indicates unidirectional polarity, with cathode marking defining the clamping direction; using 1KSMB51A in reverse-biased configurations may result in premature failure or undefined clamping behavior.
What is the standoff voltage rating of the 1KSMB51A, and how does it relate to system design?
The 1KSMB51A has a maximum working peak reverse voltage (VWM) of 43.6 V, meaning it can continuously block up to this DC or RMS voltage without exceeding 1 µA leakage. System designers must ensure that normal operating voltage on the protected line remains below 43.6 V to avoid excessive leakage or thermal runaway. This rating directly informs placement upstream of voltage regulators or downstream of rectifiers in 48 V nominal systems.
Does the 1KSMB51A meet automotive transient immunity standards?
Yes, the 1KSMB51A meets ISO 7637-2 requirements for Pulse 1, 2a, 2b, 3a, and 3b, covering typical automotive electrical disturbances such as inductive load switching, battery disconnection, and capacitive coupling. Its 1000 W peak pulse rating and fast <1.0 ps response enable effective suppression of these transients without additional external components in compliant designs.
What is the moisture sensitivity level (MSL) of the 1KSMB51A, and what does it mean for assembly?
The 1KSMB51A is rated MSL Level 1 per J-STD-020, indicating unlimited floor life at ≤30 °C/60% RH and no requirement for dry-packaging or pre-reflow baking. This simplifies SMT assembly logistics and eliminates yield loss from moisture-related popcorning during reflow, making the 1KSMB51A ideal for high-volume automated manufacturing environments.
1KSMB51A 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):
- 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)
1KSMB51A FAQ
1.How can I place an order for 1KSMB51A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1KSMB51A 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 1KSMB51A reliable?
The price and inventory of 1KSMB51A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1KSMB51A is usually 5 days.
3.What payment methods are accepted for 1KSMB51A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1KSMB51A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1KSMB51A?
1KSMB51A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1KSMB51A 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 1KSMB51A?
For technical support, including 1KSMB51A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1KSMB51A requirements.
6.How does Aetrix verify that 1KSMB51A is sourced from the original manufacturer or authorized distributors?
All 1KSMB51A 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 1KSMB51A meets industry standards.
7.What is the process for return or replacement of 1KSMB51A?
All 1KSMB51A units undergo pre-shipment inspection (PSI). If there is an issue with 1KSMB51A, 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 1KSMB51A part is unused and in its original packaging.
Return procedure for 1KSMB51A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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