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Taiwan Semiconductor Corporation 1KSMB12A
- Part No.:
- 1KSMB12A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1KSMB12A.pdf
- Description:
- TVS DIODE 10.2VWM 16.7VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,082
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Product details
Overview
1KSMB12A from Taiwan Semiconductor is a unidirectional 1000W surface-mount transient voltage suppressor (TVS) diode with a standoff voltage of 10.2 V, breakdown voltage range 11.4–12.6 V at 1 mA, and clamping voltage of 16.7 V at 59.9 A peak pulse current. It is designed for overvoltage protection in DC power rails of switching mode power supplies, adapters, and display electronics.
For engineers reviewing the 1KSMB12A datasheet, 1KSMB12A pinout, 1KSMB12A application, or 1KSMB12A equivalent, key selection criteria include its DO-214AA (SMB) package, 1000 W peak pulse power rating, 16.7 V clamping voltage at 59.9 A, -55 °C to +175 °C operating junction temperature, and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b automotive transients.
Technical Context
The 1KSMB12A operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its 11.4 V minimum breakdown threshold. Its glass-passivated junction ensures stable leakage performance (<5 µA at 10.2 V) and fast response (<1.0 ps from 0 V to VBR), enabling effective suppression of fast-rising ESD and load-dump transients.
Thermally, it features a junction-to-lead resistance of 20 °C/W and junction-to-ambient resistance of 100 °C/W, supporting continuous power dissipation up to 5 W at 25 °C ambient. It is rated for 100 A non-repetitive forward surge current (8.3 ms half-sine) and meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 10.2 V - Maximum continuous reverse working voltage before leakage exceeds 5 µA |
| VBR min/max | 11.4 V / 12.6 V at 1.0 mA - Ensures reliable turn-on within defined tolerance band under standardized test conditions |
| VC@IPP | 16.7 V at 59.9 A - Clamped voltage during 10/1000 µs transient, limiting downstream circuit stress |
| PPPSM | 1000 W - Peak pulse power handling capability per 10/1000 µs waveform, critical for automotive load-dump immunity |
| TJ max | +175 °C - Enables operation in high-temperature environments such as enclosed power supplies or under-hood automotive modules |
| Package | DO-214AA (SMB) - Surface-mount outline with cathode band marking, compatible with automated placement and reflow soldering |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band; weight ≈ 0.110 g; UL 94V-0 rated compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., GND or return path) in unidirectional TVS configuration |
| Cathode | Reverse-biased protection terminal | Connected to protected line (e.g., +12 V rail); clamps transients toward anode when voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable VBR tolerance and low leakage (<5 µA) across temperature and lifetime |
| Clamping voltage ≤16.7 V at 59.9 A | Provides predictable overvoltage limiting for 12 V nominal systems without overstressing downstream ICs |
| ISO 7637-2 compliant (Pulse 1/2a/2b/3a/3b) | Validated for automotive electronic module protection against battery line transients including load dump and inductive switching |
| Moisture sensitivity level 1 | Eliminates bake requirements prior to SMT assembly, reducing manufacturing cost and process complexity |
Applications
| Switching Mode Power Supply (SMPS) | AC-DC Adapters |
|---|---|
Use Scenario: Protection of primary-side DC bus and secondary-side output rails against input surges and flyback spikes. IC Role / Device Role / Timing Role: Unidirectional TVS placed across output capacitor or input bulk capacitor to clamp transient overvoltages. Use Value: Limits voltage excursion to ≤16.7 V during 1000 W transients, preserving regulator ICs and MOSFETs rated for 20 V maximum. | Use Scenario: Input-stage surge suppression in wall-mounted and desktop AC-DC adapters subject to line disturbances. IC Role / Device Role / Timing Role: Standoff-rated TVS on DC input line upstream of rectification and filtering stages. Use Value: Withstands 100 A surge current (8.3 ms) and clamps 10/1000 µs pulses to safe levels, meeting IEC 61000-4-5 Level 3 requirements. |
| Television Power Boards | Monitor Backlight Drivers |
Use Scenario: Protection of main 12 V and 24 V distribution rails feeding audio/video processing and backlight subsystems. IC Role / Device Role / Timing Role: Parallel-connected TVS on board-level power planes to absorb coupling-induced transients from internal switching noise. Use Value: Fast <1.0 ps response prevents latch-up in HDMI receiver ICs and microcontrollers sharing the same supply domain. | Use Scenario: Overvoltage safeguard for CCFL or LED driver ICs exposed to inductive kickback from transformer or boost inductor switching. IC Role / Device Role / Timing Role: Clamp device placed between driver output and ground to shunt energy from parasitic inductance. Use Value: 16.7 V clamping ensures driver ICs with 20 V absolute maximum ratings remain within safe operating area during fault events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ12A (Bourns) | Same DO-214AA package; VBR = 13.3–14.7 V; VC = 19.9 V @ 50.2 A; PPPM = 600 W | Lower peak power rating reduces effectiveness against severe load-dump events per ISO 7637-2 Pulse 5a | Select SMBJ12A only where system-level testing confirms 600 W clamping margin is sufficient |
| P6SMB12A (ON Semiconductor) | Identical DO-214AA footprint; VBR = 11.4–12.6 V; VC = 16.7 V @ 59.9 A; PPPM = 600 W | Same clamping performance but reduced 600 W pulse power limits sustained energy absorption capability | Use P6SMB12A in cost-sensitive consumer applications where full 1000 W rating is not required |
Compared with 1KSMB12A, SMBJ12A and P6SMB12A offer identical package and similar VBR/VC, but both are limited to 600 W peak pulse power-making the 1KSMB12A preferable for automotive-grade or industrial power systems demanding higher transient energy handling.
Availability
1KSMB12A is available at Aetrix Electronics and suitable for switching mode power supplies, AC-DC adapters, and television power boards requiring stable component supply and automotive-grade transient immunity.
Supply support for 1KSMB12A 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, with global distribution and AEC-Q200 qualified product lines.
The 1KSMB series is engineered specifically for high-energy transient suppression in automotive and industrial power systems, emphasizing robustness, repeatable clamping, and compatibility with automated SMT assembly processes.
FAQ
What is the maximum clamping voltage of the 1KSMB12A under standard test conditions?
The 1KSMB12A has a maximum clamping voltage (VC) of 16.7 V when subjected to a 10/1000 µs transient waveform at a peak pulse current (IPP) of 59.9 A. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuits during surge events. The 1KSMB12A maintains this clamping performance across its specified operating temperature range.
Is the 1KSMB12A suitable for bidirectional transient protection?
No, the 1KSMB12A is a unidirectional TVS diode intended for DC line protection with defined polarity. For bidirectional applications, the 1KSMB12CA variant must be used-it features symmetrical breakdown in both directions and uses the N10G marking code. Using the 1KSMB12A in an AC or bipolar signal path will result in forward conduction during negative half-cycles and potential failure.
What is the standoff voltage (VWM) of the 1KSMB12A, and how does it relate to system design?
The standoff voltage (VWM) of the 1KSMB12A is 10.2 V, representing the maximum continuous reverse voltage that can be applied without exceeding 5 µA leakage current. In system design, VWM must exceed the normal operating voltage of the protected line-e.g., for a nominal 12 V rail, 10.2 V provides minimal margin, confirming the 1KSMB12A is best suited for 12 V systems with tight regulation or where transient headroom is prioritized over DC margin.
Does the 1KSMB12A meet automotive transient standards?
Yes, the 1KSMB12A meets ISO 7637-2 requirements for Pulse 1 (inductive load disconnect), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling), making it suitable for front-end protection in automotive body control modules, infotainment power supplies, and lighting drivers. It is not rated for Pulse 5a (load dump), which requires higher energy handling beyond its 1000 W rating.
What is the thermal resistance profile of the 1KSMB12A, and how does it affect PCB layout?
The 1KSMB12A has a junction-to-lead thermal resistance (RθJL) of 20 °C/W and junction-to-ambient resistance (RθJA) of 100 °C/W. To maintain reliability under repeated surge events, PCB layout should maximize copper area connected to both terminals-especially the cathode-to improve heat spreading. Use ≥2 oz copper and thermal vias under the pad to reduce effective RθJA and prevent localized overheating during high-duty-cycle transients.
1KSMB12A 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):
- 10.2V
- Voltage - Breakdown (Min):
- 11.4V
- Voltage - Clamping (Max) @ Ipp:
- 16.7V
- Current - Peak Pulse (10/1000µs):
- 59.9A
- 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)
1KSMB12A FAQ
1.How can I place an order for 1KSMB12A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1KSMB12A 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 1KSMB12A reliable?
The price and inventory of 1KSMB12A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1KSMB12A is usually 5 days.
3.What payment methods are accepted for 1KSMB12A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1KSMB12A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1KSMB12A?
1KSMB12A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1KSMB12A 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 1KSMB12A?
For technical support, including 1KSMB12A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1KSMB12A requirements.
6.How does Aetrix verify that 1KSMB12A is sourced from the original manufacturer or authorized distributors?
All 1KSMB12A 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 1KSMB12A meets industry standards.
7.What is the process for return or replacement of 1KSMB12A?
All 1KSMB12A units undergo pre-shipment inspection (PSI). If there is an issue with 1KSMB12A, 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 1KSMB12A part is unused and in its original packaging.
Return procedure for 1KSMB12A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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