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Taiwan Semiconductor Corporation 1KSMB30AH
- Part No.:
- 1KSMB30AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1KSMB30AH.pdf
- Description:
- TVS DIODE 25.6VWM 41.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,741
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Product details
Overview
1KSMB30AH from Taiwan Semiconductor is a unidirectional 1000W transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, with standoff voltage 25.6 V, breakdown voltage 28.5–31.5 V at 1 mA, clamping voltage 41.4 V at 24.2 A, and AEC-Q101 qualification for automotive-grade reliability.
For engineers reviewing the 1KSMB30AH datasheet, 1KSMB30AH pinout, 1KSMB30AH application, or 1KSMB30AH equivalent, this device serves as a robust, surface-mount solution for protecting automotive electronics, industrial control inputs, and power supply rails against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients and ESD events.
Technical Context
The 1KSMB30AH operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its 28.5 V minimum breakdown threshold. It delivers sub-1 ps response time and clamps transient energy to ≤41.4 V at 24.2 A peak pulse current under 10/1000 µs waveform.
Its glass-passivated junction ensures stable leakage (<1.0 µA at 25.6 V), while thermal resistance of 20 °C/W (junction-to-lead) supports sustained surge handling in compact SMB layouts. The device is rated for TJ = –55 °C to +175 °C and meets J-STD-020 moisture sensitivity level 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 25.6 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR min/max | 28.5 V / 31.5 V @ 1 mA - Confirmed avalanche onset range for reliable triggering |
| VC @ IPP | 41.4 V @ 24.2 A - Clamped voltage during 10/1000 µs transient, defining protected circuit stress |
| PPPM | 1000 W - Peak pulse power rating per single 10/1000 µs event |
| IR @ VWM | ≤1.0 µA - Low leakage ensures minimal standby power loss and signal integrity |
| Package | DO-214AA (SMB) - Standardized surface-mount outline with 0.110 g mass and UL 94V-0 molding |
Pinout & Package
DO-214AA (SMB) package with cathode band marking on one end; two-terminal unidirectional configuration. Matte tin-plated leads meet J-STD-002 solderability and JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse voltage reference node | Connected to system ground or low-side return path in unidirectional clamp topology |
| Cathode | Reverse voltage input / Transient energy sink | Connected to protected line (e.g., CAN bus, sensor supply, MCU I/O); polarity-marked band identifies this terminal |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive underhood and body-control applications per stress test requirements |
| Glass passivated junction | Ensures long-term parameter stability and reduced parameter drift over temperature and life |
| ISO 7637-2 compliance | Guarantees immunity to standardized automotive load-dump and inductive-switching transients |
| Sub-1 ps response time | Enables protection of high-speed interfaces before damaging voltage overshoot occurs |
| Moisture sensitivity level 1 | Eliminates bake requirements prior to reflow, supporting standard SMT assembly flow |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and ground to shunt >100 V spikes. Use Value: Limits voltage seen by downstream regulators and microcontrollers to ≤41.4 V, preventing latch-up or oxide damage. | Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature) connected to PLC inputs. IC Role / Device Role / Timing Role: Clamp induced EFT or cable discharge events on 4–20 mA or 0–10 V lines. Use Value: Maintains signal fidelity by suppressing transients before they corrupt ADC sampling or damage op-amp front ends. |
| DC Motor Drive Input Protection | USB-C Power Delivery Port Protection |
Use Scenario: Shielding H-bridge gate drivers and current-sense amplifiers from inductive kickback. IC Role / Device Role / Timing Role: Mounted across motor terminals or supply rails to absorb flyback energy. Use Value: Prevents destructive voltage reversal exceeding 31.5 V breakdown, enabling use with 24 V nominal systems. | Use Scenario: Adding secondary-level surge protection on USB-C VBUS lines after primary protection. IC Role / Device Role / Timing Role: Secondary clamp on 20 V PD lines where fast response and low clamping are critical. Use Value: Delivers 41.4 V clamping at 24.2 A-lower than typical 45+ V alternatives-reducing stress on USB-PD controllers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ30A | Same DO-214AA package; VBR 31.7–35.0 V, VC 48.4 V @ 20.7 A - higher clamping voltage | Less effective clamping margin for 3.3 V/5 V logic rails near protected ICs | Select 1KSMB30AH when lower VC is required to meet strict voltage tolerance budgets |
| P6SMB30A | Identical electrical specs (VBR 28.5–31.5 V, VC 41.4 V), but not AEC-Q101 qualified | Not suitable for automotive production without additional qualification testing | Choose 1KSMB30AH for automotive OEM programs requiring certified component traceability |
Compared with SMBJ30A and P6SMB30A, the 1KSMB30AH offers identical clamping performance plus AEC-Q101 qualification and tighter VBR distribution-making it the preferred choice for automotive and industrial designs requiring guaranteed reliability and documented stress-test validation.
Availability
1KSMB30AH is available at Aetrix Electronics and suitable for automotive power line protection, industrial sensor interface protection, DC motor drive input protection, and USB-C power delivery port protection requiring stable component supply and full traceability.
Supply support for 1KSMB30AH 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 automotive, industrial, and consumer markets.
The 1KSMB series is designed specifically for high-reliability transient suppression in harsh environments-emphasizing AEC-Q101 compliance, tight parametric distribution, and robust thermal performance in SMB packaging.
FAQ
What is the maximum clamping voltage of the 1KSMB30AH under standard test conditions?
The 1KSMB30AH has a maximum clamping voltage (VC) of 41.4 V when subjected to a 10/1000 µs transient waveform at 24.2 A peak current. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuits during surge events. The 1KSMB30AH maintains this clamping performance across its full operating temperature range (–55 °C to +175 °C).
Is the 1KSMB30AH suitable for bidirectional transient protection?
No, the 1KSMB30AH is a unidirectional TVS diode intended for DC-biased lines such as power supplies or grounded signal paths. For bidirectional protection (e.g., AC lines or differential buses), the 1KSMB30CAH variant must be used. The 1KSMB30AH features a cathode band marking and conducts only in reverse breakdown-forward conduction follows standard silicon diode behavior.
Does the 1KSMB30AH require special handling during PCB assembly?
No, the 1KSMB30AH is rated moisture sensitivity level 1 per J-STD-020, meaning it can be stored indefinitely at ambient conditions and placed directly into standard reflow profiles without baking. Its matte tin-plated leads comply with J-STD-002 for solderability, and the DO-214AA package supports automated pick-and-place with standard nozzle tooling.
What automotive standards does the 1KSMB30AH meet?
The 1KSMB30AH is AEC-Q101 qualified and explicitly tested to meet ISO 7637-2 for Pulse 1 (inductive load disconnect), Pulse 2a (sudden load removal), Pulse 2b (supply interruption), Pulse 3a (capacitive coupled transients), and Pulse 3b (ground noise). These certifications validate its suitability for engine control units, body modules, and ADAS subsystems.
How does the 1KSMB30AH compare to the SMBJ30A in terms of thermal performance?
The 1KSMB30AH has a junction-to-lead thermal resistance (RθJL) of 20 °C/W, matching the SMBJ30A. However, its glass-passivated junction and optimized die attach yield more consistent thermal derating above 25 °C ambient, especially under repetitive surge conditions. Both parts share identical DO-214AA footprint and solder thermal mass, but the 1KSMB30AH's AEC-Q101 qualification confirms validated thermal cycling endurance.
1KSMB30AH 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
1KSMB30AH FAQ
1.How can I place an order for 1KSMB30AH through Aetrix?
Please submit a Request for Quotation (RFQ) for 1KSMB30AH 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 1KSMB30AH reliable?
The price and inventory of 1KSMB30AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1KSMB30AH is usually 5 days.
3.What payment methods are accepted for 1KSMB30AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1KSMB30AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1KSMB30AH?
1KSMB30AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1KSMB30AH 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 1KSMB30AH?
For technical support, including 1KSMB30AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1KSMB30AH requirements.
6.How does Aetrix verify that 1KSMB30AH is sourced from the original manufacturer or authorized distributors?
All 1KSMB30AH 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 1KSMB30AH meets industry standards.
7.What is the process for return or replacement of 1KSMB30AH?
All 1KSMB30AH units undergo pre-shipment inspection (PSI). If there is an issue with 1KSMB30AH, 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 1KSMB30AH part is unused and in its original packaging.
Return procedure for 1KSMB30AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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