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Taiwan Semiconductor Corporation 1KSMB12AH
- Part No.:
- 1KSMB12AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1KSMB12AH.pdf
- Description:
- TVS DIODE 10.2VWM 16.7VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,293
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Product details
Overview
1KSMB12AH from Taiwan Semiconductor is a unidirectional 1000W surface-mount Transient Voltage Suppressor (TVS) diode in DO-214AA (SMB) package, with breakdown voltage 11.4–12.6 V at 1.0 mA, stand-off voltage 10.2 V, clamping voltage 16.7 V at 59.9 A, and AEC-Q101 qualification for automotive-grade surge protection.
For engineers reviewing the 1KSMB12AH datasheet, 1KSMB12AH pinout, 1KSMB12AH application, or 1KSMB12AH equivalent, key selection criteria include its 1000W peak pulse power rating, sub-1 ps response time, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, glass-passivated junction, and unidirectional polarity marking for ESD and load-switch transient suppression in automotive electronics.
Technical Context
The 1KSMB12AH operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its 11.4–12.6 V breakdown range. It clamps transients to ≤16.7 V at 59.9 A (10/1000 µs waveform), limiting energy dissipation via thermal conduction through its DO-214AA package with RθJL = 20 °C/W.
Designed for automotive environments, it meets AEC-Q101 stress testing and ISO 7637-2 immunity requirements for inductive switching (Pulse 2b), battery disconnect (Pulse 3b), and EFT events. Its moisture sensitivity level is J-STD-020 Level 1, enabling standard SMT reflow without baking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR min/max | 11.4 V / 12.6 V - defines minimum and maximum voltage at which avalanche conduction begins under 1.0 mA test current |
| VWM | 10.2 V - maximum continuous reverse operating voltage before leakage exceeds 5 µA |
| VC @ IPP | 16.7 V at 59.9 A - clamped voltage during 10/1000 µs transient, determining protected circuit's maximum overvoltage exposure |
| PPPSM | 1000 W - peak pulse power handling capability, defining survivability against high-energy surges |
| IFSM | 100 A - peak forward surge current rating (8.3 ms half-sine), relevant for inadvertent forward fault conditions |
| TJ max | +175 °C - maximum junction temperature, supporting operation in under-hood automotive environments |
| RθJL | 20 °C/W - junction-to-lead thermal resistance, critical for PCB copper pour design to sustain repetitive pulses |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, single-diode unidirectional configuration with cathode band marking. Dimensions per JEDEC DO-214AA standard; recommended pad layout provided in manufacturer datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse transient sink | Connected to protected line (e.g., CAN_H, LIN, or 12V rail); conducts during forward faults and clamps reverse transients |
| Cathode | Reference node / Clamping return path | Connected to ground or low-impedance reference plane; establishes clamping threshold relative to system GND |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use across temperature, humidity, mechanical shock, and lifetime reliability per stress test standards |
| Glass passivated junction | Enhances long-term stability and reduces parameter drift under thermal cycling and humidity exposure |
| Sub-1 ps response time | Enables clamping before sensitive IC inputs experience damaging overvoltage-critical for CAN/LIN bus protection |
| ISO 7637-2 compliance | Guarantees robustness against real-world vehicle electrical disturbances including load dump, jump start, and inductive switch-off |
| DO-214AA (SMB) package | Standardized footprint compatible with automated placement and reflow; supports 5 W steady-state power dissipation at 25°C ambient |
Applications
| Automotive CAN Bus Protection | 12V Power Rail Surge Suppression |
|---|---|
Use Scenario: Protecting CAN transceivers from ESD and load-dump-induced transients in body control modules. IC Role / Device Role / Timing Role: Unidirectional TVS placed between CAN_H/CAN_L and chassis ground to clamp common-mode surges while preserving signal integrity. Use Value: Limits CAN_H voltage to ≤16.7 V during 59.9 A transients, preventing transceiver latch-up or damage per ISO 11898-2. | Use Scenario: Safeguarding microcontrollers and sensors powered from vehicle 12V supply against battery disconnection spikes. IC Role / Device Role / Timing Role: Standoff-rated TVS connected between 12V rail and ground, activated only during >10.2 V overvoltage events. Use Value: Absorbs up to 1000W of pulse energy (10/1000 µs), maintaining downstream VDD within safe operating limits during ISO 7637-2 Pulse 2b. |
| LED Lighting Driver Protection | Industrial Sensor Interface Protection |
Use Scenario: Shielding constant-current LED drivers from inductive kickback during MOSFET switching in headlamp modules. IC Role / Device Role / Timing Role: Unidirectional TVS placed across driver output to clamp flyback voltage spikes generated by LED string inductance. Use Value: Clamps transients to 16.7 V within <1 ps, preventing gate oxide rupture in driver FETs rated for ≤20 V drain-source breakdown. | Use Scenario: Securing analog sensor inputs (e.g., pressure, temperature) in engine bay ECUs exposed to EFT and burst noise. IC Role / Device Role / Timing Role: Low-leakage (≤5 µA @ 10.2 V) TVS on signal lines to suppress fast transients without loading precision front-end amplifiers. Use Value: Maintains signal accuracy with <5 µA reverse leakage at 10.2 V, while clamping 30 A transients to ≤16.7 V per IEC 61000-4-4 Level 4. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ12A | Same DO-214AA package; VBR = 13.3–14.7 V, VC = 19.9 V @ 50.3 A, PPPSM = 600 W | Lower peak power rating and higher clamping voltage reduce margin for severe ISO 7637-2 Pulse 1 events | Select SMBJ12A only if system-level testing confirms 19.9 V clamping is acceptable for protected ICs |
| 1.5SMC12A | DO-214AB (SMC) package; VBR = 12.4–13.7 V, VC = 19.9 V @ 75.4 A, PPPSM = 1500 W | Larger footprint increases PCB area; higher clamping voltage offsets benefit of higher power rating | Choose 1.5SMC12A only when board space permits larger SMC package and 19.9 V clamping is tolerable |
Compared with SMBJ12A and 1.5SMC12A, the 1KSMB12AH delivers superior clamping performance (16.7 V vs. ≥19.9 V) at equal or lower cost in DO-214AA, making it optimal for space-constrained automotive nodes requiring tight voltage margins.
Availability
1KSMB12AH is available at Aetrix Electronics and suitable for automotive CAN bus protection, 12V power rail surge suppression, and LED lighting driver protection requiring stable component supply and AEC-Q101-compliant sourcing.
Supply support for 1KSMB12AH 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 was designed specifically for automotive electronic systems requiring high-reliability, high-power transient suppression in compact surface-mount packages compliant with AEC-Q101 and ISO 7637-2.
FAQ
What is the polarity configuration of the 1KSMB12AH?
The 1KSMB12AH is a unidirectional TVS diode, with cathode indicated by a band on the DO-214AA package. It conducts in forward bias like a standard diode and clamps reverse transients above its breakdown voltage. This configuration is used where DC bias exists on the protected line, such as 12V rails or CAN_H signals referenced to ground. The 1KSMB12AH must be oriented with cathode toward the higher potential side of the protected circuit.
Does the 1KSMB12AH meet automotive qualification standards?
Yes, the 1KSMB12AH is AEC-Q101 qualified and tested for temperature cycling, humidity, mechanical shock, and lifetime reliability per automotive stress requirements. It also meets ISO 7637-2 immunity standards for Pulse 1 (inductive load disconnect), Pulse 2a (battery feed interruption), Pulse 2b (alternator load dump), and Pulses 3a/3b (capacitive coupling and line impedance stabilization). These qualifications are documented in Taiwan Semiconductor's official A2102 datasheet revision.
What is the maximum clamping voltage of the 1KSMB12AH under standard test conditions?
The maximum clamping voltage of the 1KSMB12AH is 16.7 V, measured at a peak pulse current (IPP) of 59.9 A using the standardized 10/1000 µs waveform. This value represents the upper limit of voltage seen by downstream circuitry during worst-case transient events. The 1KSMB12AH achieves this clamping performance while maintaining a 1000W peak pulse power rating, making it suitable for protecting automotive ICs with absolute maximum ratings up to 18 V.
Can the 1KSMB12AH be used in bidirectional applications?
No, the 1KSMB12AH is unidirectional only. For bidirectional transient suppression-such as differential signal lines like CAN or USB-Taiwan Semiconductor specifies the 1KSMB12CAH variant, which uses a center-tapped dual-diode configuration. Using the 1KSMB12AH in bidirectional mode would result in forward conduction during negative transients, potentially causing failure or incorrect clamping behavior. Always match the suffix: "AH" = unidirectional, "CAH" = bidirectional.
What is the thermal resistance profile of the 1KSMB12AH and how does it affect PCB layout?
The 1KSMB12AH has a junction-to-lead thermal resistance (RθJL) of 20 °C/W and junction-to-ambient resistance (RθJA) of 100 °C/W. To sustain repetitive transients, PCB layout must maximize copper area connected to both leads-especially the cathode-to emulate the test condition used for RθJL. Insufficient copper pour raises effective RθJA, risking thermal runaway during multiple pulses. The 1KSMB12AH's DO-214AA footprint requires adherence to TSC's recommended pad layout for optimal thermal and mechanical reliability.
1KSMB12AH 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
1KSMB12AH FAQ
1.How can I place an order for 1KSMB12AH through Aetrix?
Please submit a Request for Quotation (RFQ) for 1KSMB12AH 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 1KSMB12AH reliable?
The price and inventory of 1KSMB12AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1KSMB12AH is usually 5 days.
3.What payment methods are accepted for 1KSMB12AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1KSMB12AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1KSMB12AH?
1KSMB12AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1KSMB12AH 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 1KSMB12AH?
For technical support, including 1KSMB12AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1KSMB12AH requirements.
6.How does Aetrix verify that 1KSMB12AH is sourced from the original manufacturer or authorized distributors?
All 1KSMB12AH 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 1KSMB12AH meets industry standards.
7.What is the process for return or replacement of 1KSMB12AH?
All 1KSMB12AH units undergo pre-shipment inspection (PSI). If there is an issue with 1KSMB12AH, 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 1KSMB12AH part is unused and in its original packaging.
Return procedure for 1KSMB12AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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