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Taiwan Semiconductor Corporation 1KSMB20AH
- Part No.:
- 1KSMB20AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1KSMB20AH.pdf
- Description:
- TVS DIODE 17.1VWM 27.7VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,316
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Product details
Overview
1KSMB20AH from Taiwan Semiconductor is a unidirectional 1000W surface-mount Transient Voltage Suppressor (TVS) diode in DO-214AA (SMB) package, with breakdown voltage 19.0–21.0 V, stand-off voltage 17.1 V, clamping voltage 27.7 V at 36.1 A, and AEC-Q101 qualification for automotive-grade reliability.
For engineers reviewing the 1KSMB20AH datasheet, 1KSMB20AH pinout, 1KSMB20AH application, or 1KSMB20AH equivalent, this device serves as a high-energy transient protector for 12 V automotive power rails, industrial control I/O lines, and DC power supply inputs where fast response (<1.0 ps), low clamping ratio, and ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance are required.
Technical Context
The 1KSMB20AH operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its 19.0–21.0 V breakdown threshold. It delivers 1000 W peak pulse power (10/1000 µs waveform), clamps transients to ≤27.7 V at 36.1 A, and maintains <1.0 µA leakage at 17.1 V stand-off voltage.
Its glass-passivated junction ensures stable VBR over temperature and life cycle, while the DO-214AA package supports automated placement and meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR min/max | 19.0 V / 21.0 V - defines minimum and maximum voltage at which avalanche conduction begins under 1.0 mA test current |
| VWM | 17.1 V - maximum continuous reverse operating voltage before significant leakage occurs |
| VC @ IPP | 27.7 V @ 36.1 A - clamped voltage during worst-case 10/1000 µs surge, limiting downstream stress |
| PPPSM | 1000 W - peak pulse power handling capability per standardized 10/1000 µs waveform |
| IR @ VWM | 1.0 µA - reverse leakage current at rated stand-off voltage, ensuring minimal standby power loss |
| TJ max | +175 °C - maximum junction temperature enabling operation in under-hood automotive environments |
| Package | DO-214AA (SMB) - industry-standard surface-mount outline with 0.110 g mass and matte tin-plated leads |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with cathode band marking; terminals are matte tin-plated leads compliant with J-STD-002 solderability and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional configuration |
| Cathode | Reverse-biased transient clamp terminal | Connected to protected line (e.g., 12 V rail); conducts only during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and infotainment systems |
| Clamping voltage 27.7 V @ 36.1 A | Provides 1.63× overvoltage margin above 17.1 V stand-off, protecting 24 V tolerant ICs on 12 V rails |
| Response time <1.0 ps | Enables suppression of ESD and EFT transients before sensitive logic or analog circuitry responds |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Meets full automotive electrical disturbance immunity requirements for battery-supplied systems |
| Glass passivated junction | Ensures long-term VBR stability and reduced parameter drift across thermal cycling and humidity exposure |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V supply lines in engine control units against load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery input and upstream DC-DC converter input. Use Value: Limits voltage to ≤27.7 V during 1000 W surges, preventing damage to 36 V-rated regulators and microcontrollers. | Use Scenario: Shielding 4–20 mA current loop receivers from EFT and lightning-induced surges on factory floor wiring. IC Role / Device Role / Timing Role: Standoff protection element mounted at connector entry point before signal conditioning amplifier. Use Value: Maintains <1.0 µA leakage at 17.1 V, avoiding offset errors in precision analog front-ends while clamping >36 A transients. |
| DC Power Supply Input Protection | LED Driver Overvoltage Suppression |
Use Scenario: Safeguarding AC/DC adapter outputs feeding PoE-powered devices or embedded controllers. IC Role / Device Role / Timing Role: Primary transient suppressor on secondary-side 12–24 V output rail, upstream of LDOs and PMICs. Use Value: Withstands repetitive 10/1000 µs pulses up to 1000 W without degradation, supporting EN 61000-4-5 Level 3 compliance. | Use Scenario: Preventing catastrophic failure of constant-current LED drivers due to inductive kickback from relay-controlled strings. IC Role / Device Role / Timing Role: Parallel-connected TVS across driver output terminals to absorb energy from coil de-energization. Use Value: Fast <1.0 ps response captures initial voltage spike before driver MOSFETs enter avalanche, preserving FET SOA. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20A | Same DO-214AA package; VBR = 22.2–24.5 V, VC = 32.4 V @ 30.9 A, PPPM = 600 W | Lower peak power rating and higher clamping voltage reduce margin for severe load dump events | Select when cost sensitivity outweighs need for full 1000 W surge handling |
| 1.5SMC20A | DO-214AB (SMC) package; VBR = 22.2–24.5 V, VC = 32.4 V @ 30.9 A, PPPM = 1500 W | Larger footprint increases PCB area but enables higher surge endurance in space-tolerant designs | Choose when system-level testing requires >1000 W margin or thermal derating below 100°C ambient |
Compared with SMBJ20A and 1.5SMC20A, the 1KSMB20AH offers optimal balance of 1000 W surge capacity, compact DO-214AA footprint, and automotive-qualified reliability-making it preferred for space-constrained 12 V automotive modules where AEC-Q101 compliance and ISO 7637-2 Pulse 1 immunity are mandatory.
Availability
1KSMB20AH is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and DC power supply input surge suppression requiring stable component supply and AEC-Q101 traceability.
Supply support for 1KSMB20AH 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.
The 1KSMB series is designed specifically for high-reliability transient suppression in automotive and industrial environments, emphasizing AEC-Q101 qualification, ISO 7637-2 compliance, and robust glass-passivated junction construction.
FAQ
What is the breakdown voltage range for 1KSMB20AH?
The 1KSMB20AH has a guaranteed breakdown voltage range of 19.0 V to 21.0 V at 1.0 mA test current, measured per ANSI/IEEE C62.35. This range ensures consistent triggering behavior across production lots and temperature extremes, critical for predictable clamping performance in automotive 12 V systems where nominal rail voltage varies from 9 V to 16 V.
Is 1KSMB20AH suitable for bidirectional transient protection?
No, the 1KSMB20AH is unidirectional and intended for DC line protection with defined polarity. For bidirectional applications such as AC signal lines or differential buses, the 1KSMB20CAH variant must be used. The "AH" suffix explicitly denotes unidirectional configuration, and using 1KSMB20AH in reverse-biased AC scenarios risks premature failure due to lack of symmetrical avalanche characteristics.
What packaging and reel quantity does 1KSMB20AH ship in?
The 1KSMB20AH ships in DO-214AA (SMB) package on 3,000-unit tape-and-reel format, compatible with standard SMT pick-and-place equipment. The reel complies with EIA-481-D standards, and each unit features cathode band marking for automated optical inspection and correct orientation during placement-ensuring high-yield assembly in automotive electronics manufacturing.
How does the clamping voltage of 1KSMB20AH compare to its stand-off voltage?
The 1KSMB20AH clamps transients to 27.7 V at 36.1 A, while its maximum stand-off voltage is 17.1 V-yielding a clamping ratio of 1.62. This tight ratio ensures protected circuits experience minimal overvoltage stress during surge events, making 1KSMB20AH especially effective for safeguarding 24 V tolerant ICs powered from 12 V rails where headroom above VWM is limited.
Does 1KSMB20AH meet moisture sensitivity requirements for lead-free reflow?
Yes, the 1KSMB20AH is rated Moisture Sensitivity Level 1 per J-STD-020, meaning it can be stored indefinitely at ≤30 °C/85 % RH without baking prior to lead-free reflow. This eliminates pre-reflow moisture mitigation steps in high-volume SMT lines, reducing process complexity and cost-particularly valuable in automotive Tier 1 manufacturing where J-STD-020 compliance is mandatory for all discrete components.
1KSMB20AH 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):
- 17.1V
- Voltage - Breakdown (Min):
- 19V
- Voltage - Clamping (Max) @ Ipp:
- 27.7V
- Current - Peak Pulse (10/1000µs):
- 36.1A
- 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)
1KSMB20AH FAQ
1.How can I place an order for 1KSMB20AH through Aetrix?
Please submit a Request for Quotation (RFQ) for 1KSMB20AH 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 1KSMB20AH reliable?
The price and inventory of 1KSMB20AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1KSMB20AH is usually 5 days.
3.What payment methods are accepted for 1KSMB20AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1KSMB20AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1KSMB20AH?
1KSMB20AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1KSMB20AH 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 1KSMB20AH?
For technical support, including 1KSMB20AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1KSMB20AH requirements.
6.How does Aetrix verify that 1KSMB20AH is sourced from the original manufacturer or authorized distributors?
All 1KSMB20AH 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 1KSMB20AH meets industry standards.
7.What is the process for return or replacement of 1KSMB20AH?
All 1KSMB20AH units undergo pre-shipment inspection (PSI). If there is an issue with 1KSMB20AH, 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 1KSMB20AH part is unused and in its original packaging.
Return procedure for 1KSMB20AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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