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Taiwan Semiconductor Corporation 1KSMB68AH
- Part No.:
- 1KSMB68AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1KSMB68AH.pdf
- Description:
- TVS DIODE 58.1VWM 92VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,815
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Product details
Overview
1KSMB68AH from Taiwan Semiconductor is a unidirectional 1000W surface-mount Transient Voltage Suppressor (TVS) diode in DO-214AA (SMB) package, with breakdown voltage 64.6–71.4 V, stand-off voltage 58.1 V, clamping voltage 92.0 V at 10.9 A, and AEC-Q101 qualification for automotive-grade reliability.
For engineers reviewing the 1KSMB68AH datasheet, 1KSMB68AH pinout, 1KSMB68AH application, or 1KSMB68AH equivalent, key selection criteria include peak pulse power (1000 W), clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, moisture sensitivity level (J-STD-020 Level 1), glass-passivated junction, and unidirectional polarity marking for ESD and inductive load protection in automotive electronics.
Technical Context
The 1KSMB68AH operates as a unidirectional avalanche diode optimized for fast transient suppression in automotive and industrial power rails. Its glass-passivated junction ensures stable breakdown behavior, while sub-1 ps response time enables effective capture of EFT and load-dump events before downstream ICs are damaged.
Designed to meet ISO 7637-2 immunity requirements, it delivers 1000 W non-repetitive peak pulse power with 10/1000 µs waveform, 92.0 V clamping voltage at 10.9 A, and low leakage (<1 µA @ 58.1 V), supporting robust protection in 12 V and 24 V vehicle subsystems without compromising standby current budgets.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR min/max | 64.6 V / 71.4 V - defines guaranteed avalanche conduction onset range at 1.0 mA test current |
| VWM | 58.1 V - maximum continuous reverse operating voltage; system rail must stay below this to avoid leakage-induced power loss |
| VC @ IPP | 92.0 V - clamped voltage during 10.9 A transient; determines maximum stress on protected IC inputs |
| PPPSM | 1000 W - peak pulse power handling capability with 10/1000 µs waveform; sets surge energy absorption limit |
| IPP | 10.9 A - peak impulse current corresponding to 92.0 V clamping; used to size upstream fusing and trace routing |
| TJ max | +175 °C - maximum junction temperature; enables operation in under-hood automotive environments |
| Package | DO-214AA (SMB) - standardized surface-mount outline with 0.110 g mass and J-STD-002 solderability |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with matte tin-plated leads, cathode band marking for unidirectional polarity, UL 94V-0 flammability rating, and JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or low-impedance return path; forms current loop during clamping |
| Cathode | Protected line input | Connected to supply rail or signal line; reverse-biased during normal operation, avalanches during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive temperature cycling, humidity, mechanical shock, and lifetime reliability per stress test standard |
| Glass-passivated junction | Ensures stable VBR tolerance and long-term parameter consistency across thermal and aging stresses |
| Fast response time <1.0 ps | Enables suppression of nanosecond-scale ESD and EFT transients before logic-level damage occurs |
| ISO 7637-2 compliance | Guarantees survivability against standardized automotive load-dump (Pulse 5a/b), coupling (Pulse 1/2a/2b), and EFT (Pulse 3a/3b) |
| J-STD-020 Level 1 moisture sensitivity | Allows unlimited floor life and reflow without baking, simplifying SMT assembly in high-volume production |
Applications
| Automotive Infotainment Power Rail | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protecting USB-C PD controller and display interface power lines from battery load-dump transients in head unit designs. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 12 V supply and DC-DC input, clamping surges before LDOs and PMICs. Use Value: Limits peak stress to ≤92.0 V during 1000 W pulses, preserving 15 V-rated input capacitors and avoiding brownout resets in 1KSMB68AH-protected systems. | Use Scenario: Safeguarding 24 V digital input channels against inductive kickback from solenoid drivers in factory automation controllers. IC Role / Device Role / Timing Role: Standoff-connected TVS on each opto-isolator input leg, conducting only during >58.1 V transients. Use Value: Maintains <1 µA leakage at 24 V nominal, eliminating false triggering while clamping 10.9 A spikes to protect microcontroller GPIOs in 1KSMB68AH-based input modules. |
| LED Headlamp Driver Output Stage | Telecom PoE Midspan Surge Interface |
Use Scenario: Suppressing inductive switching transients generated by high-current buck drivers powering adaptive front-lighting arrays. IC Role / Device Role / Timing Role: Parallel-mounted TVS at driver output, absorbing flyback energy during MOSFET turn-off. Use Value: Withstands 175 °C junction temperature and delivers 92.0 V clamping at 10.9 A, preventing gate oxide rupture in downstream FETs in 1KSMB68AH-protected lamp modules. | Use Scenario: Front-end transient protection on 48 V PoE midspan data lines exposed to lightning-induced surges in outdoor telecom cabinets. IC Role / Device Role / Timing Role: Primary unidirectional clamp on power pair, coordinated with secondary GDT and MOV stages. Use Value: Provides sub-1 ps response and 1000 W pulse rating to absorb initial surge energy before slower protectors activate, ensuring integrity of Ethernet PHYs in 1KSMB68AH-integrated PoE interfaces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ64A | VBR = 71.1–78.6 V, VC = 103 V @ 9.7 A, same DO-214AA package | Higher clamping voltage reduces margin for 68 V-rated downstream components | Select when higher VWM (57.6 V) aligns better with 48 V system derating needs |
| 1.5SMC68A | VBR = 72.2–80.6 V, VC = 110 V @ 9.1 A, DO-214AB (SMC) package (larger footprint) | Larger SMC package requires PCB redesign; higher thermal resistance (RθJA = 125 °C/W) | Choose only if 1.5 kW peak power is required and board space permits larger outline |
Compared with SMBJ64A and 1.5SMC68A, the 1KSMB68AH offers tighter VBR tolerance (±5%), lower clamping voltage (92.0 V vs. ≥103 V), and AEC-Q101 qualification-making it preferred for automotive 12 V/24 V power rail protection where precision clamping and qualification compliance are mandatory.
Availability
1KSMB68AH is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC digital inputs, and LED headlamp driver output stages requiring stable component supply, full traceability, and automotive-grade qualification.
Supply support for 1KSMB68AH 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 1KSMBxH series was designed specifically for AEC-Q101-compliant transient suppression in automotive power distribution networks, balancing high pulse power, fast response, and surface-mount manufacturability in SMB packages.
FAQ
What is the breakdown voltage range for 1KSMB68AH?
The 1KSMB68AH has a guaranteed breakdown voltage range of 64.6 V to 71.4 V at 1.0 mA test current, measured per ANSI/IEEE C62.35. This range reflects manufacturing tolerance and ensures reliable avalanche initiation across temperature and lifetime, critical for consistent clamping behavior in automotive 12 V/24 V systems using the 1KSMB68AH.
Is 1KSMB68AH suitable for bidirectional transient protection?
No, the 1KSMB68AH is unidirectional only. For bidirectional protection, the correct variant is 1KSMB68CAH, which uses a center-tapped dual-diode configuration. Using 1KSMB68AH in AC or bipolar signal paths will result in forward conduction during negative transients, potentially damaging the device or failing to suppress-always verify polarity and application topology before selecting the 1KSMB68AH.
What does the "AH" suffix indicate in 1KSMB68AH?
The "AH" suffix in 1KSMB68AH denotes unidirectional configuration with AEC-Q101 qualification and halogen-free construction per IEC 61249-2-21. It distinguishes the part from non-automotive or bidirectional variants (e.g., "CAH") and confirms compliance with automotive reliability, environmental, and assembly standards-key for qualifying the 1KSMB68AH in Tier 1 automotive supply chains.
How does 1KSMB68AH perform under high ambient temperature?
The 1KSMB68AH is rated for junction temperatures up to +175 °C and features a junction-to-ambient thermal resistance of 100 °C/W. At 85 °C ambient, its peak pulse power derates to ~700 W (per Fig. 2), maintaining effective clamping for load-dump events in under-hood environments-confirming suitability for engine control and lighting applications where the 1KSMB68AH operates reliably beyond standard commercial temperature ranges.
What is the maximum clamping voltage of 1KSMB68AH at its rated peak current?
The maximum clamping voltage of 1KSMB68AH is 92.0 V at 10.9 A peak impulse current (IPP) with a 10/1000 µs waveform. This value represents worst-case voltage seen by protected circuitry during surge events and is measured under standardized conditions-ensuring design margins for 68 V-rated components when using the 1KSMB68AH in automotive and industrial transient protection circuits.
1KSMB68AH 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):
- 58.1V
- Voltage - Breakdown (Min):
- 64.6V
- Voltage - Clamping (Max) @ Ipp:
- 92V
- Current - Peak Pulse (10/1000µs):
- 10.9A
- 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)
1KSMB68AH FAQ
1.How can I place an order for 1KSMB68AH through Aetrix?
Please submit a Request for Quotation (RFQ) for 1KSMB68AH 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 1KSMB68AH reliable?
The price and inventory of 1KSMB68AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1KSMB68AH is usually 5 days.
3.What payment methods are accepted for 1KSMB68AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1KSMB68AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1KSMB68AH?
1KSMB68AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1KSMB68AH 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 1KSMB68AH?
For technical support, including 1KSMB68AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1KSMB68AH requirements.
6.How does Aetrix verify that 1KSMB68AH is sourced from the original manufacturer or authorized distributors?
All 1KSMB68AH 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 1KSMB68AH meets industry standards.
7.What is the process for return or replacement of 1KSMB68AH?
All 1KSMB68AH units undergo pre-shipment inspection (PSI). If there is an issue with 1KSMB68AH, 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 1KSMB68AH part is unused and in its original packaging.
Return procedure for 1KSMB68AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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