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Taiwan Semiconductor Corporation 1KSMB22AH
- Part No.:
- 1KSMB22AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1KSMB22AH.pdf
- Description:
- TVS DIODE 18.8VWM 30.6VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,116
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Product details
Overview
1KSMB22AH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, rated for 1000W peak pulse power, 20.9–23.1V breakdown voltage at 1mA, 18.8V stand-off voltage, and clamps to 30.6V at 32.7A. It protects automotive and industrial power rails against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the 1KSMB22AH datasheet, 1KSMB22AH pinout, 1KSMB22AH application, or 1KSMB22AH equivalent, this device delivers AEC-Q101-qualified surge immunity with <1.0ps response time, glass-passivated junction, and J-STD-020 Level 1 moisture sensitivity - critical for high-reliability automotive ECU and body control module designs.
Technical Context
The 1KSMB22AH operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR range (20.9–23.1V). Its clamping action limits transient-induced overvoltage to ≤30.6V at 32.7A (10/1000µs waveform), ensuring downstream ICs remain below absolute maximum ratings.
Thermally, it features RθJL = 20°C/W and RθJA = 100°C/W, enabling sustained operation up to TJ = +175°C. It meets JESD 201 Class 2 whisker resistance and UL 94V-0 flammability requirements for under-hood environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR @ IT = 1mA | 20.9–23.1V: Ensures reliable turn-on before system-level overvoltage damages 24V automotive logic or microcontrollers |
| VWM | 18.8V: Maximum continuous reverse operating voltage - compatible with 24V nominal systems with ±10% tolerance |
| VC @ IPP = 32.7A | 30.6V: Clamped voltage during 10/1000µs surge - keeps protected ICs within safe SOA during load dump events |
| PPPSM | 1000W: Peak pulse power handling per ISO 7637-2 Pulse 5a - sufficient for 12V/24V vehicle electrical system transients |
| IPP | 32.7A: Maximum non-repetitive peak current - defines minimum PCB trace width and fuse coordination |
| TJ max | +175°C: Junction temperature rating - supports placement near heat-generating components in engine control units |
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 conduction path / low-impedance return during clamping | Connected to system ground or low-side reference; carries full surge current during transient suppression |
| Cathode | Reverse-biased input / high-impedance standby node | Connected to protected line (e.g., 24V rail); blocks leakage (<1µA at 18.8V) until breakdown threshold is exceeded |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability across -55°C to +175°C, including temperature cycling and mechanical shock |
| Glass passivated junction | Enhances long-term stability and humidity resistance versus epoxy-passivated alternatives in under-hood applications |
| Fast response time | <1.0ps rise time ensures clamping initiates before nanosecond-scale ESD or fast transient energy couples into sensitive nodes |
| ISO 7637-2 compliance | Tested against Pulse 1 (inductive load dump), Pulse 2a/2b (battery disconnect), and Pulse 3a/3b (switching noise) waveforms |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protects microcontroller GPIO and CAN transceiver power pins from load dump and battery reversal transients in BCM power distribution networks. IC Role / Device Role: Unidirectional TVS placed between 24V supply rail and ground, upstream of LDO regulators. Use Value: Limits clamped voltage to 30.6V, preventing latch-up or oxide breakdown in 3.3V/5V logic powered from buck-converted 24V rails. | Use Scenario: Shields 24V digital input channels of programmable logic controllers from field-wiring induced surges and relay coil flyback. IC Role / Device Role: Standoff protection element on each isolated input channel, paired with optocoupler input stage. Use Value: Withstands 1000W pulses without degradation, maintaining ≤1µA leakage at 18.8V to preserve input threshold accuracy over 10+ year service life. |
| LED Headlamp Driver Power Stage | Automotive Infotainment Power Supply |
Use Scenario: Guards MOSFET gate drivers and current-sense amplifiers in constant-current LED driver circuits against inductive switching spikes. IC Role / Device Role: Localized TVS at DC-DC converter output, directly across load terminals. Use Value: Fast <1.0ps response prevents overshoot from propagating to analog sensing circuitry, preserving dimming linearity and thermal foldback accuracy. | Use Scenario: Suppresses conducted transients entering infotainment head unit via fused 12V supply line during ignition and alternator load changes. IC Role / Device Role: Primary front-end surge clamp before DC-DC converters and PMICs. Use Value: 1000W rating handles worst-case ISO 7637-2 Pulse 5a (load dump), while 18.8V VWM avoids false triggering during normal 13.5–14.8V alternator operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ22A | Same DO-214AA package, identical VBR (22.2–24.6V), but lower PPPM = 600W and higher VC = 35.5V at 16.9A | Not suitable for ISO 7637-2 Pulse 5a; limited to lower-energy transients like EFT or ESD | Select 1KSMB22AH when full 1000W load dump immunity is required; SMBJ22A suffices for board-level ESD only |
| 1.5SMC22A | Higher power (1500W), same VBR, but larger DO-214AB (SMC) package - incompatible with SMB footprint | Requires PCB redesign; used where thermal derating margin or extended lifetime under repetitive surges is critical | Choose 1KSMB22AH for space-constrained automotive modules; use 1.5SMC22A only if layout allows SMC pad expansion and thermal mass increase |
Compared with SMBJ22A and 1.5SMC22A, the 1KSMB22AH uniquely balances 1000W surge capability, SMB footprint compatibility, and AEC-Q101 qualification - making it the optimal choice for production automotive ECUs where board area, reliability, and standard compliance are jointly constrained.
Availability
1KSMB22AH is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC digital inputs, and LED headlamp driver protection requiring stable component supply, AEC-Q101 compliance, and ISO 7637-2 transient immunity.
Supply support for 1KSMB22AH 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 automotive-qualified components since 1979.
The 1KSMBxxAH series was developed specifically for AEC-Q101-compliant transient suppression in 12V/24V automotive power networks, emphasizing robustness, fast response, and surface-mount manufacturability for automated assembly lines.
FAQ
What is the polarity configuration of the 1KSMB22AH?
The 1KSMB22AH is a unidirectional TVS diode with cathode-band marking. It conducts in forward bias like a standard diode and clamps reverse transients above its breakdown voltage. This configuration is ideal for protecting positive-rail systems where ground-referenced surge paths are defined - such as 24V supply lines in automotive ECUs. The cathode must be connected to the protected line, anode to ground.
Does the 1KSMB22AH meet automotive qualification standards?
Yes, the 1KSMB22AH is AEC-Q101 qualified, tested for temperature cycling, mechanical shock, humidity, and high-temperature operating life per automotive stress test requirements. It also meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b transient immunity standards - confirming suitability for under-hood and chassis-mounted electronic control units where reliability under harsh environmental conditions is mandatory.
What is the maximum clamping voltage of the 1KSMB22AH during a surge event?
The 1KSMB22AH has a maximum clamping voltage (VC) of 30.6V at a peak pulse current (IPP) of 32.7A under the standardized 10/1000µs waveform. This value is guaranteed across manufacturing lots and temperature ranges, ensuring consistent protection margins for downstream 3.3V or 5V logic powered from regulated 24V rails. It reflects actual measured performance, not typical or average data.
Can the 1KSMB22AH be used in bidirectional applications?
No - the 1KSMB22AH is unidirectional only. For bidirectional transient suppression (e.g., protecting AC-coupled signal lines or differential buses), the pin-compatible 1KSMB22CAH variant must be used. That part features symmetrical breakdown in both polarities and is marked with "N10M" code. Substituting 1KSMB22AH in a bidirectional circuit will result in forward conduction during negative transients and failure to clamp.
What is the moisture sensitivity level (MSL) of the 1KSMB22AH?
The 1KSMB22AH has a moisture sensitivity level (MSL) of Level 1 per J-STD-020, meaning it is not moisture-sensitive and may be stored indefinitely at ambient conditions without baking prior to reflow soldering. This eliminates floor-life tracking and pre-bake steps in high-volume SMT assembly, reducing process complexity and cost for automotive Tier 1 suppliers using this device in DO-214AA (SMB) packages.
1KSMB22AH 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):
- 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)
1KSMB22AH FAQ
1.How can I place an order for 1KSMB22AH through Aetrix?
Please submit a Request for Quotation (RFQ) for 1KSMB22AH 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 1KSMB22AH reliable?
The price and inventory of 1KSMB22AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1KSMB22AH is usually 5 days.
3.What payment methods are accepted for 1KSMB22AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1KSMB22AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1KSMB22AH?
1KSMB22AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1KSMB22AH 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 1KSMB22AH?
For technical support, including 1KSMB22AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1KSMB22AH requirements.
6.How does Aetrix verify that 1KSMB22AH is sourced from the original manufacturer or authorized distributors?
All 1KSMB22AH 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 1KSMB22AH meets industry standards.
7.What is the process for return or replacement of 1KSMB22AH?
All 1KSMB22AH units undergo pre-shipment inspection (PSI). If there is an issue with 1KSMB22AH, 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 1KSMB22AH part is unused and in its original packaging.
Return procedure for 1KSMB22AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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