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Taiwan Semiconductor Corporation 1KSMB12CA
- Part No.:
- 1KSMB12CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1KSMB12CA.pdf
- Description:
- TVS DIODE 10.2VWM 16.7VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,481
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Product details
Overview
1KSMB12CA from Taiwan Semiconductor is a bi-directional 1000W transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, with breakdown voltage 11.4–12.6 V at 1 mA test current, stand-off voltage 10.2 V, maximum clamping voltage 16.7 V at 59.9 A peak pulse current, and junction temperature range −55 °C to +175 °C - deployed for surge protection in switching mode power supplies and consumer display interfaces.
For engineers reviewing the 1KSMB12CA datasheet, 1KSMB12CA pinout, 1KSMB12CA application, or 1KSMB12CA equivalent, key selection criteria include bi-directional clamping capability, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, 1.0 ps response time, UL 94V-0 molding compound, and JESD201 Class 2 whisker resistance - all confirmed for this exact SMB-packaged CA-suffix variant.
Technical Context
The 1KSMB12CA implements a glass passivated silicon junction optimized for fast transient suppression in bi-directional signal and power lines. Its 10/1000 µs waveform rating delivers 1000 W non-repetitive peak pulse power, with thermal resistance RθJL = 20 °C/W and RθJA = 100 °C/W enabling reliable operation under surge stress without external heatsinking in standard PCB layouts.
Designed for automotive and industrial environments, it meets ISO 7637-2 immunity requirements for load dump and inductive switching transients. The CA suffix explicitly denotes bi-directional configuration, distinguishing it from unidirectional variants like 1KSMB12A - polarity is marked by cathode band on the SMB case per JEDEC DO-214AA standard.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR min/max | 11.4 V / 12.6 V at IT = 1 mA - defines minimum voltage at which device enters avalanche conduction during bidirectional surges |
| VWM | 10.2 V - maximum continuous reverse operating voltage before leakage exceeds 1 µA; sets safe DC bias margin |
| VC@IPP | 16.7 V at IPP = 59.9 A (10/1000 µs) - clamping voltage limiting downstream circuit stress during worst-case surge |
| PPPSM | 1000 W - peak pulse power handling capacity under standardized transient waveform, critical for automotive load-dump survival |
| Junction Temp | −55 °C to +175 °C - enables deployment in under-hood automotive, industrial SMPS, and outdoor power adapters |
| Package | DO-214AA (SMB) - surface-mount outline with 0.110 g mass, UL 94V-0 flammability rating, and matte tin-plated leads |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with two axial leads; cathode band marks polarity for unidirectional variants, but 1KSMB12CA is bi-directional - no functional polarity marking required per datasheet note "For Bidirectional use CA suffix" and mechanical diagram showing symmetric terminal layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bi-directional transient path | Both terminals serve identical clamping function - no fixed anode/cathode assignment; connects across protected line pair (e.g., RS-485 A/B, USB D+/D−) |
| Case | Non-conductive housing | UL 94V-0 rated epoxy encapsulation provides electrical isolation and flame resistance; no thermal pad or metal slug |
Key Features
| Feature | Design Value |
|---|---|
| Bi-directional clamping | Enables single-device protection of differential or AC-coupled lines (e.g., CAN bus, audio inputs) without polarity concerns |
| 1.0 ps response time | Sub-nanosecond junction turn-on ensures suppression initiates before ESD or fast transients damage downstream ICs |
| ISO 7637-2 compliance | Validated against automotive Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnect), and Pulse 3a/3b (line impedance coupling) |
| Moisture sensitivity level 1 | No floor-life limitation or bake requirement prior to reflow - compatible with standard SMT assembly without special handling |
| Halogen-free & RoHS | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU - supports green manufacturing and end-of-life recycling mandates |
Applications
| Switching Mode Power Supply (SMPS) | Consumer Display Interfaces |
|---|---|
Use Scenario: Protection of 12 V input rails against load dump and inductive kickback in compact AC/DC adapters. IC Role / Device Role / Timing Role: Transient voltage suppressor placed at input stage to clamp surges before they reach PWM controller and MOSFET gate drivers. Use Value: 16.7 V clamping voltage limits stress on 20 V-rated input capacitors and 30 V MOSFETs, preventing premature failure during ISO 7637-2 Pulse 5a events. |
Use Scenario: Surge protection on HDMI or DisplayPort hot-swap lines exposed to ESD and cable discharge events. IC Role / Device Role / Timing Role: Bi-directional TVS placed differentially across data pairs to absorb ±15 kV contact ESD (IEC 61000-4-2) without signal distortion. Use Value: 1.0 ps response and low junction capacitance (<100 pF at VWM) preserve signal integrity up to 3 Gbps while meeting EMC immunity requirements. |
| Automotive Body Control Modules | Industrial Sensor Signal Conditioning |
Use Scenario: Input protection for LIN bus transceivers connected to vehicle door modules subject to battery reversal and jump-start transients. IC Role / Device Role / Timing Role: Bidirectional clamp across LIN line and ground to shunt reverse-polarity surges and coupled noise pulses. Use Value: −55 °C to +175 °C operating range and JESD201 Class 2 whisker resistance ensure reliability in engine bay and chassis-mounted ECUs over full vehicle lifetime. |
Use Scenario: Protection of 4–20 mA analog sensor outputs in factory automation systems exposed to motor drive noise and relay switching spikes. IC Role / Device Role / Timing Role: TVS placed across output terminals to limit common-mode transients before they saturate op-amp input stages or damage ADC front-ends. Use Value: 1000 W peak power rating absorbs repetitive 100 V/1 A transients from nearby VFDs without degradation, maintaining loop accuracy over 10+ years. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ12CA (Bourns) | Same DO-214AA package, 11.1–12.3 V VBR, 16.7 V VC @ 60 A - tighter VBR tolerance (±5% vs ±5.3% for 1KSMB12CA), higher IPP (60 A vs 59.9 A) | Identical bi-directional use cases; validated for same ISO 7637-2 pulses and IEC 61000-4-2 ESD levels | Preferred where tighter breakdown voltage matching is required across production lots; otherwise functionally interchangeable |
| P6SMB12CA (ON Semiconductor) | Same SMB package, 11.4–12.6 V VBR, 16.7 V VC @ 59.9 A - identical electrical specs, but higher RθJA (110 °C/W vs 100 °C/W) and no JESD201 whisker test data published | Compatible in most SMPS and display designs; may require derating in high-ambient industrial enclosures (>70 °C) | Select when sourcing from ON Semi's long-lifecycle program; verify thermal margin in sealed enclosures with >10 K/W board resistance |
Compared with SMBJ12CA and P6SMB12CA, the 1KSMB12CA offers identical clamping performance and bi-directional functionality, with superior thermal resistance (RθJA = 100 °C/W) and documented JESD201 Class 2 whisker resistance - making it preferred for high-reliability automotive and industrial deployments where long-term solder joint integrity is critical.
Availability
1KSMB12CA is available at Aetrix Electronics and suitable for switching mode power supplies, consumer display interfaces, and automotive body control modules requiring stable component supply, consistent parametric performance, and full traceability from wafer lot to shipment.
Supply support for 1KSMB12CA 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 headquartered in Hsinchu, Taiwan, specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs since 1979.
The 1KSMBxxCA series was developed specifically for high-energy transient suppression in automotive and industrial power electronics, emphasizing robustness under ISO 7637-2 pulses, extended temperature operation, and automated SMT compatibility.
FAQ
What does the 'CA' suffix mean in 1KSMB12CA?
The 'CA' suffix in 1KSMB12CA explicitly indicates a bi-directional configuration - meaning the device provides symmetrical clamping for both positive and negative transients across its two terminals. Unlike unidirectional variants (e.g., 1KSMB12A), the 1KSMB12CA has no designated anode or cathode and is used across differential lines or AC-coupled circuits without polarity constraints.
Is 1KSMB12CA compliant with automotive surge standards?
Yes, the 1KSMB12CA meets ISO 7637-2 requirements for Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnection), and Pulse 3a/3b (capacitive coupling), as confirmed in the official Taiwan Semiconductor datasheet Version I2102. Its 1000 W peak pulse power rating and 16.7 V clamping voltage are validated under the 10/1000 µs waveform specified in that standard.
What is the maximum clamping voltage of 1KSMB12CA and at what current?
The maximum clamping voltage of 1KSMB12CA is 16.7 V, measured at a peak pulse current (IPP) of 59.9 A under the standardized 10/1000 µs waveform. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during worst-case surge events.
Does 1KSMB12CA require special handling during PCB assembly?
No - the 1KSMB12CA has Moisture Sensitivity Level (MSL) 1 per J-STD-020, meaning it can be stored indefinitely at ambient conditions and placed directly into reflow without baking or dry-pack requirements. Its matte tin-plated leads are solderable per J-STD-002, supporting standard lead-free or SnPb reflow profiles.
How does the thermal performance of 1KSMB12CA compare to similar SMB-packaged TVS diodes?
The 1KSMB12CA features a junction-to-ambient thermal resistance (RθJA) of 100 °C/W, lower than many competing SMB TVS diodes (e.g., P6SMB12CA at 110 °C/W). This 10 °C/W improvement allows higher sustained surge duty cycles or operation in higher ambient temperatures without exceeding the 175 °C maximum junction temperature.
1KSMB12CA 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:
- -
- Bidirectional Channels:
- 1
- 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)
1KSMB12CA FAQ
1.How can I place an order for 1KSMB12CA through Aetrix?
Please submit a Request for Quotation (RFQ) for 1KSMB12CA 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 1KSMB12CA reliable?
The price and inventory of 1KSMB12CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1KSMB12CA is usually 5 days.
3.What payment methods are accepted for 1KSMB12CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1KSMB12CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1KSMB12CA?
1KSMB12CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1KSMB12CA 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 1KSMB12CA?
For technical support, including 1KSMB12CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1KSMB12CA requirements.
6.How does Aetrix verify that 1KSMB12CA is sourced from the original manufacturer or authorized distributors?
All 1KSMB12CA 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 1KSMB12CA meets industry standards.
7.What is the process for return or replacement of 1KSMB12CA?
All 1KSMB12CA units undergo pre-shipment inspection (PSI). If there is an issue with 1KSMB12CA, 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 1KSMB12CA part is unused and in its original packaging.
Return procedure for 1KSMB12CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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