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Taiwan Semiconductor Corporation 1KSMB22CAH
- Part No.:
- 1KSMB22CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1KSMB22CAH.pdf
- Description:
- TVS DIODE 18.8VWM 30.6VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,732
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Product details
Overview
1KSMB22CAH from Taiwan Semiconductor is a bi-directional transient voltage suppressor diode in DO-214AA (SMB) package, rated for 1000W peak pulse power, 20.9–23.1V breakdown voltage (VBR), and 30.6V clamping voltage (VC@IPP). It protects automotive and industrial circuits against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the 1KSMB22CAH datasheet, 1KSMB22CAH pinout, 1KSMB22CAH application, or 1KSMB22CAH equivalent, this AEC-Q101 qualified TVS provides verified clamping performance, fast sub-1ps response, glass-passivated junction, and moisture sensitivity level 1 handling - critical for ESD and inductive load protection in harsh environments.
Technical Context
The 1KSMB22CAH is a bi-directional silicon avalanche diode designed to clamp transient overvoltages in both polarities without requiring external polarity management. Its 20.9–23.1V VBR range at 1mA test current and 30.6V maximum clamping voltage at 32.7A IPP define its protective window for 24V nominal systems.
It operates across –55°C to +175°C junction temperature, with thermal resistance RθJL = 20°C/W and RθJA = 100°C/W, enabling reliable surface-mount deployment in high-temperature automotive ECUs and industrial controllers where sustained power dissipation must be managed.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 20.9 V / 23.1 V - defines minimum and maximum voltage at which avalanche conduction begins under 1 mA test current |
| VWM | 18.8 V - maximum continuous reverse operating voltage before leakage exceeds 1 µA |
| VC@IPP | 30.6 V - clamped voltage during 10/1000 µs 32.7 A surge, limiting stress on downstream ICs |
| PPPSM | 1000 W - peak pulse power handling capability per standard 10/1000 µs waveform |
| IPP | 32.7 A - maximum non-repetitive peak impulse current it can safely divert |
| Junction Temp Range | –55°C to +175°C - supports operation in under-hood automotive and industrial ambient conditions |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, bi-directional configuration with cathode band omitted (symmetrical terminals). Matte tin-plated leads, UL 94V-0 molding compound, 0.110 g weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bi-directional transient path | No polarity marking required; conducts equally in both directions above VBR |
| Case (body) | Thermal and mechanical interface | DO-214AA outline enables automated placement and meets JESD201 Class 2 whisker resistance |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
| Glass passivated junction | Enhances long-term stability and reduces parameter drift under thermal stress and humidity |
| Sub-1 ps response time | Clamps transients before sensitive logic or analog circuitry sustains damage |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling) |
| Moisture sensitivity level 1 | Enables direct use from reel without baking, reducing manufacturing overhead |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protecting microcontroller GPIOs and CAN transceiver lines from load dump and relay coil flyback in vehicle door modules. IC Role / Device Role / Timing Role: Bi-directional voltage clamp placed across power rail and signal line to shunt transients before they reach protected ICs. Use Value: Enables robust operation at 12V/24V bus levels with 30.6V clamping, preventing latch-up or gate oxide rupture in 3.3V/5V logic. | Use Scenario: Safeguarding 24V digital input channels of programmable logic controllers against field-wiring induced surges and ESD events. IC Role / Device Role / Timing Role: Primary front-end transient suppressor mounted directly at connector entry point before optocoupler or Schmitt trigger input stage. Use Value: Withstands 1000W pulses while maintaining <1 µA leakage at 18.8V, preserving input threshold accuracy and system immunity. |
| LED Driver Power Stage Protection | Smart Meter Communication Interface |
Use Scenario: Shielding MOSFET gate drivers and current-sense amplifiers in constant-current LED ballasts from inductive switching spikes. IC Role / Device Role / Timing Role: Parallel-connected TVS across DC-link capacitor and driver supply rails to absorb energy from parasitic inductance. Use Value: 20.9–23.1V VBR aligns with 24V system rails, ensuring early conduction before MOSFET VDS rating is exceeded. | Use Scenario: Protecting RS-485 transceivers and microcontroller UART lines in utility smart meters exposed to lightning-induced surges on metering bus lines. IC Role / Device Role / Timing Role: Bi-directional clamping device placed between differential pair and ground to suppress common-mode transients. Use Value: 32.7A IPP capacity and 30.6V VC ensure transceiver survival under IEC 61000-4-5 Level 3 (1kV/2kV) tests. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ22CA | Same DO-214AA package, identical VBR (20.9–23.1V), but lower PPPSM = 600W and higher VC = 33.2V | Limited to lower-energy transients; not suitable for ISO 7637-2 Pulse 1 or high-IPP scenarios | Select only when system-level surge energy is confirmed ≤600W and clamping margin allows 2.6V higher VC |
| 1.5KE22CA | Higher PPPSM = 1500W, but axial DO-201 package - incompatible with automated SMT assembly | Requires through-hole rework or hybrid assembly; unsuitable for high-density PCBs | Choose only for legacy through-hole designs where board space and assembly process permit axial components |
Compared with SMBJ22CA and 1.5KE22CA, the 1KSMB22CAH delivers optimal balance of 1000W surge capacity, SMT-compatible DO-214AA footprint, and 30.6V clamping - making it the preferred choice for new automotive and industrial designs requiring AEC-Q101 compliance and full ISO 7637-2 coverage.
Availability
1KSMB22CAH is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC inputs, LED driver protection, and smart meter communication interfaces requiring stable component supply and AEC-Q101 assurance.
Supply support for 1KSMB22CAH 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-Q101 validation capabilities.
The 1KSMBxxCAH series was developed specifically for automotive and industrial transient suppression, emphasizing high-power clamping, bi-directional symmetry, and robustness in high-humidity, high-temperature environments.
FAQ
What does the 'CAH' suffix indicate in 1KSMB22CAH?
The 'CAH' suffix denotes a bi-directional configuration - meaning the 1KSMB22CAH functions identically in both forward and reverse bias, with no cathode marking required. This distinguishes it from the 'AH' variant (uni-directional), and enables symmetric transient suppression on AC-coupled or floating signal lines without polarity concerns.
Is 1KSMB22CAH suitable for protecting CAN bus lines in automotive applications?
Yes, the 1KSMB22CAH is appropriate for CAN FD and classical CAN bus protection due to its 30.6V clamping voltage, sub-1ps response, and ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance. Its bi-directional nature matches the differential nature of CAN signaling, and its 20.9–23.1V VBR ensures conduction before transceiver damage thresholds are reached.
What is the maximum steady-state power dissipation for 1KSMB22CAH?
The 1KSMB22CAH has a steady-state power dissipation (PD) rating of 5 W at TA = 25°C. This value derates linearly above 25°C per the pulse derating curve in the datasheet, reaching zero at approximately 150°C ambient - confirming its suitability for thermally constrained automotive and industrial enclosures.
Does 1KSMB22CAH meet RoHS and halogen-free requirements?
Yes, the 1KSMB22CAH is RoHS compliant and halogen-free per IEC 61249-2-21. The molding compound is UL 94V-0 rated, and terminals are matte tin plated - satisfying environmental compliance mandates for automotive and industrial end equipment sold in EU, China, and North America markets.
How does the junction-to-lead thermal resistance affect PCB layout for 1KSMB22CAH?
With RθJL = 20°C/W, the 1KSMB22CAH efficiently transfers heat from the die to the PCB copper via its leads. To maximize thermal performance, designers should use ≥2 mm² of 2-oz copper connected to both terminals, avoid narrow traces, and consider thermal vias under the pad - especially in high-duty-cycle surge environments where average power approaches 1–2W.
1KSMB22CAH 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):
- 18.8V
- Voltage - Breakdown (Min):
- 20.9V
- Voltage - Clamping (Max) @ Ipp:
- 30.6V
- Current - Peak Pulse (10/1000µs):
- 32.7A
- 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)
1KSMB22CAH FAQ
1.How can I place an order for 1KSMB22CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for 1KSMB22CAH 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 1KSMB22CAH reliable?
The price and inventory of 1KSMB22CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1KSMB22CAH is usually 5 days.
3.What payment methods are accepted for 1KSMB22CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1KSMB22CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1KSMB22CAH?
1KSMB22CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1KSMB22CAH 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 1KSMB22CAH?
For technical support, including 1KSMB22CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1KSMB22CAH requirements.
6.How does Aetrix verify that 1KSMB22CAH is sourced from the original manufacturer or authorized distributors?
All 1KSMB22CAH 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 1KSMB22CAH meets industry standards.
7.What is the process for return or replacement of 1KSMB22CAH?
All 1KSMB22CAH units undergo pre-shipment inspection (PSI). If there is an issue with 1KSMB22CAH, 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 1KSMB22CAH part is unused and in its original packaging.
Return procedure for 1KSMB22CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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