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Taiwan Semiconductor Corporation 1KSMB75CAH
- Part No.:
- 1KSMB75CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1KSMB75CAH.pdf
- Description:
- TVS DIODE 64.1VWM 103VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,055
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Product details
Overview
1KSMB75CAH from Taiwan Semiconductor is a bi-directional 1000W surface-mount Transient Voltage Suppressor (TVS) in DO-214AA (SMB) package, with 71.3V–78.8V breakdown voltage (VBR), 64.1V stand-off voltage (VWM), and 103V clamping voltage (VC@IPP) at 9.7A peak pulse current. It meets AEC-Q101 qualification and ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive transient immunity.
For engineers reviewing the 1KSMB75CAH datasheet, 1KSMB75CAH pinout, 1KSMB75CAH application, or 1KSMB75CAH equivalent, this device serves as a robust, RoHS-compliant, halogen-free TVS diode for bidirectional overvoltage protection in automotive power line and signal interface circuits where fast response (<1.0 ps), low leakage (<1 µA @ VWM), and high surge capability are critical.
Technical Context
The 1KSMB75CAH is a single-die, bi-directional TVS diode designed to clamp transient voltages symmetrically across both polarities. Its glass-passivated junction ensures stable breakdown behavior and long-term reliability under repetitive surge stress.
It operates within -55°C to +175°C junction temperature range, features 20°C/W junction-to-lead thermal resistance, and delivers 1000W non-repetitive peak pulse power (10/1000 µs waveform) with clamping performance validated per ANSI/IEEE C62.35 standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 71.3 V / 78.8 V - defines guaranteed breakdown initiation window under 1 mA test current; sets minimum overvoltage threshold before conduction |
| VWM | 64.1 V - maximum continuous reverse operating voltage; ensures no conduction during normal system operation |
| VC@IPP | 103 V @ 9.7 A - clamped voltage during 10/1000 µs surge; determines protected circuit's maximum transient exposure level |
| PPPSM | 1000 W - peak pulse power handling capacity; enables robust protection against ISO 7637-2 automotive transients |
| IR @ VWM | <1 µA - ultra-low reverse leakage; prevents signal distortion or power loss in high-impedance interfaces |
| TJ max | +175 °C - extended junction temperature rating supports under-hood automotive placement without derating |
| Package | DO-214AA (SMB) - industry-standard surface-mount outline enabling automated assembly and 0.110 g board weight |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band (not applicable for bi-directional configuration); terminals are solderable per J-STD-002 and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional terminal pair | No polarity marking required; identical clamping behavior for positive and negative transients |
| Case | Non-electrical mechanical interface | Thermally conductive plastic body; provides 100°C/W junction-to-ambient thermal path |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JEDEC standards |
| Glass passivated junction | Ensures stable VBR tolerance and long-term surge endurance without parameter drift |
| Fast response time <1.0 ps | Clamps transients before sensitive downstream ICs experience damaging overvoltage |
| Meets ISO 7637-2 Pulse 1/2a/2b/3a/3b | Complies with full suite of automotive electrical disturbance immunity requirements |
| Halogen-free & RoHS compliant | Fulfills environmental compliance mandates for global automotive supply chains |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V battery-fed ECUs from load dump and alternator transients. IC Role / Device Role / Timing Role: Bidirectional clamping element placed at power entry point to limit bus voltage excursion. Use Value: Clamps to 103 V during 9.7 A surge, preventing damage to microcontrollers and CAN transceivers rated ≤120 V. | Use Scenario: Shielding analog sensor inputs (e.g., pressure, temperature) from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance transient suppressor placed directly at connector interface. Use Value: Sub-1 µA leakage preserves signal integrity; symmetrical clamping avoids DC bias shift in differential pairs. |
| LED Lighting Driver Protection | Telecom Line Interface Protection |
Use Scenario: Safeguarding constant-current LED drivers against inductive switching spikes from relay or MOSFET control. IC Role / Device Role / Timing Role: Parallel-connected TVS absorbing energy from L×di/dt events on driver output lines. Use Value: 1000 W peak power rating handles repeated 10/1000 µs surges without degradation in lighting modules. | Use Scenario: Protecting RS-485 transceivers connected to long external wiring exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary-level surge suppression before secondary filtering and isolation stages. Use Value: 71.3–78.8 V VBR aligns with ±60 V common-mode range of industrial RS-485 PHYs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ75CA | Same DO-214AA package, identical VBR (71.3–78.8 V), but rated for 600 W PPPM vs. 1000 W | Limited to lower-energy transients; not suitable for ISO 7637-2 Pulse 5a (load dump) | Select 1KSMB75CAH when full 1000 W surge margin is required for automotive front-end protection |
| 1.5KE75CA | Through-hole DO-201 package, same VBR, 1000 W rating, but higher RθJA (75°C/W) and larger footprint | Not compatible with SMT-only production; unsuitable for space-constrained PCBs | Choose 1KSMB75CAH for automated surface-mount assembly and thermal performance in compact layouts |
Compared with SMBJ75CA and 1.5KE75CA, the 1KSMB75CAH uniquely combines AEC-Q101 qualification, 1000 W surge capability, and DO-214AA packaging-enabling drop-in use in automotive SMT designs requiring full ISO 7637-2 compliance without layout or thermal redesign.
Availability
1KSMB75CAH is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor systems, and LED lighting applications requiring stable component supply, AEC-Q101 validation, and high-reliability transient suppression.
Supply support for 1KSMB75CAH 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 automotive and industrial certifications.
The 1KSMBxxCAH series is part of TSC's AEC-Q101-qualified SMB package TVS family, engineered specifically for bidirectional transient immunity in harsh automotive environments including engine control, body electronics, and infotainment power domains.
FAQ
What does the 'CAH' suffix indicate in 1KSMB75CAH?
The 'CAH' suffix denotes a bi-directional configuration: the 1KSMB75CAH conducts and clamps symmetrically for both positive and negative transients, unlike uni-directional 'AH' variants. This makes it ideal for AC-coupled or floating signal lines where polarity reversal is possible, such as in CAN bus or RS-485 interfaces. The device has no polarity marking on the DO-214AA package.
Is 1KSMB75CAH suitable for ISO 7637-2 Pulse 5a (load dump) protection?
Yes, the 1KSMB75CAH is rated for 1000 W peak pulse power with a 10/1000 µs waveform and clamps to 103 V at 9.7 A, meeting the energy and voltage limits of ISO 7637-2 Pulse 5a for 12 V systems. Its AEC-Q101 qualification and 175°C TJ rating further validate its suitability for under-hood load dump protection circuits.
How does the junction-to-lead thermal resistance (RθJL = 20°C/W) impact PCB layout for 1KSMB75CAH?
The 20°C/W RθJL value means heat transfers efficiently from die to lead frame, so thermal relief on copper pads is less critical than for higher-Rθ devices. For optimal performance, use ≥25 mm² of 1 oz copper connected to each pad, avoiding thermal isolation. This allows the 1KSMB75CAH to sustain repeated surges without exceeding 175°C junction temperature in typical automotive ambient conditions.
What is the maximum reverse leakage current of 1KSMB75CAH at its 64.1 V stand-off voltage?
The maximum reverse leakage current of 1KSMB75CAH at VWM = 64.1 V is 1 µA at 25°C, per the manufacturer's electrical specifications table. This ultra-low leakage ensures minimal power loss and signal interference in high-impedance monitoring circuits, such as those found in battery management or precision sensor front-ends where even nanoamp-level currents affect accuracy.
Can 1KSMB75CAH replace 1KSMB75AH in an existing design?
No-1KSMB75CAH and 1KSMB75AH are functionally distinct: the 'CAH' version is bi-directional, while 'AH' is uni-directional with a cathode band. Swapping them requires verifying circuit polarity and transient directionality. In a uni-polar power rail, 1KSMB75AH may offer tighter VC; in AC or floating lines, only 1KSMB75CAH provides correct symmetrical clamping. Always confirm schematic and layout compatibility before substitution.
1KSMB75CAH 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):
- 64.1V
- Voltage - Breakdown (Min):
- 71.3V
- Voltage - Clamping (Max) @ Ipp:
- 103V
- Current - Peak Pulse (10/1000µs):
- 9.7A
- 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)
1KSMB75CAH FAQ
1.How can I place an order for 1KSMB75CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for 1KSMB75CAH 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 1KSMB75CAH reliable?
The price and inventory of 1KSMB75CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1KSMB75CAH is usually 5 days.
3.What payment methods are accepted for 1KSMB75CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1KSMB75CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1KSMB75CAH?
1KSMB75CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1KSMB75CAH 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 1KSMB75CAH?
For technical support, including 1KSMB75CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1KSMB75CAH requirements.
6.How does Aetrix verify that 1KSMB75CAH is sourced from the original manufacturer or authorized distributors?
All 1KSMB75CAH 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 1KSMB75CAH meets industry standards.
7.What is the process for return or replacement of 1KSMB75CAH?
All 1KSMB75CAH units undergo pre-shipment inspection (PSI). If there is an issue with 1KSMB75CAH, 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 1KSMB75CAH part is unused and in its original packaging.
Return procedure for 1KSMB75CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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