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Taiwan Semiconductor Corporation 1KSMB43CAH
- Part No.:
- 1KSMB43CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1KSMB43CAH.pdf
- Description:
- TVS DIODE 36.8VWM 59.3VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,154
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Product details
Overview
1KSMB43CAH from Taiwan Semiconductor is a bi-directional transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, rated for 1000W peak pulse power, 40.9V–45.2V breakdown voltage (VBR), 36.8V stand-off voltage (VWM), and 16.9A peak impulse current (IPP). It clamps transients to ≤59.3V and is AEC-Q101 qualified for automotive electronics protection.
For engineers reviewing the 1KSMB43CAH datasheet, 1KSMB43CAH pinout, 1KSMB43CAH application, or 1KSMB43CAH equivalent, key selection criteria include bidirectional clamping capability, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, moisture sensitivity level 1, glass passivated junction, and suitability for ESD/inductive load transient suppression in space-constrained surface-mount designs.
Technical Context
The 1KSMB43CAH implements a symmetric bi-directional avalanche structure enabling equal clamping performance for positive and negative transients. Its fast response time (<1.0 ps from 0 V to VBR min) ensures protection before sensitive downstream circuitry is damaged.
Designed for automotive-grade reliability, it meets AEC-Q101 stress tests and ISO 7637-2 immunity requirements across all defined pulses. Thermal performance is characterized by RθJL = 20°C/W and RθJA = 100°C/W, supporting operation from –55°C to +175°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 40.9 V / 45.2 V - defines minimum and maximum voltage at which avalanche conduction begins under 1.0 mA test current |
| VWM | 36.8 V - maximum continuous reverse operating voltage before leakage exceeds 1.0 µA |
| IPP | 16.9 A - peak impulse current with 10/1000 µs waveform that produces clamping voltage ≤59.3 V |
| VC@IPP | ≤59.3 V - maximum clamped voltage during full-rated transient, limiting stress on protected ICs |
| PPPSM | 1000 W - non-repetitive peak pulse power handling capability per 10/1000 µs waveform |
| TJ max | +175 °C - maximum junction temperature enabling use in under-hood automotive environments |
| Package | DO-214AA (SMB) - standardized surface-mount outline with 0.110 g mass and J-STD-002 solderable matte tin leads |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with cathode band marking; polarity is symmetric for bi-directional operation; terminals are matte tin plated and compliant with JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional transient conduction path | No fixed anode/cathode designation; either terminal serves as input/output for ± transients |
| Cathode Band (marking) | Reference polarity indicator | Present for manufacturing traceability only; functionally irrelevant in bi-directional CAH configuration |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive electronics use including temperature cycling, humidity bias, and mechanical shock testing |
| Glass passivated junction | Enhances long-term reliability and stability of breakdown voltage under thermal and electrical stress |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling) immunity requirements |
| Moisture sensitivity level 1 | Enables standard SMT assembly without baking or dry pack handling prior to reflow |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive for environmentally constrained applications |
Applications
| Automotive Infotainment Power Rails | LED Headlamp Driver Inputs |
|---|---|
Use Scenario: Protecting USB-C PD controllers and display interface ICs from load dump and alternator ripple in vehicle infotainment head units. IC Role / Device Role / Timing Role: Bi-directional TVS clamping device placed at DC input stage upstream of DC-DC converters. Use Value: Limits transient voltage to ≤59.3 V during ISO 7637-2 Pulse 2b events, preventing latch-up or gate oxide damage in 5 V/3.3 V logic rails. | Use Scenario: Safeguarding constant-current LED driver ICs against inductive kickback from relay-controlled high-beam switching. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 12 V supply line feeding buck-boost LED drivers. Use Value: Absorbs 1000 W peak energy within <1 ps, maintaining VC below 60 V to avoid driver shutdown or MOSFET avalanche failure. |
| Industrial CAN Transceiver Protection | Smart Lighting Control Node Inputs |
Use Scenario: Shielding high-speed CAN FD transceivers from ESD and cable discharge events in factory automation nodes. IC Role / Device Role / Timing Role: Secondary-level transient suppressor on VCC and common-mode lines adjacent to transceiver IC. Use Value: Provides sub-60 V clamping with <1.0 ps response, preserving signal integrity and meeting IEC 61000-4-2 Level 4 (15 kV air) requirements. | Use Scenario: Securing DALI or 0–10 V dimming interface inputs in outdoor smart streetlight controllers exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Front-end surge protector on low-voltage analog/digital control lines entering IP66-rated enclosure. Use Value: Withstands repetitive 10/1000 µs transients up to 16.9 A while maintaining VWM = 36.8 V to avoid false triggering during normal operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ43CA | Same DO-214AA package, identical VBR (40.9–45.2 V), but lower PPPSM = 600 W and higher VC = 69.4 V | Not suitable for 1000 W ISO 7637-2 Pulse 1 events; limited to lower-energy ESD/EFM scenarios | Select 1KSMB43CAH when full 1000 W pulse rating and ≤59.3 V clamping are required |
| 1.5KE43CA | Higher PPPSM = 1500 W but axial DO-15 package; VC = 69.4 V; no AEC-Q101 qualification | Requires through-hole layout; not automotive-qualified; unsuitable for automated SMT production | Choose 1KSMB43CAH for surface-mount automotive designs requiring AEC-Q101 and SMB footprint compatibility |
Compared with SMBJ43CA and 1.5KE43CA, the 1KSMB43CAH uniquely delivers 1000 W pulse rating in an AEC-Q101-qualified SMB package with the lowest clamping voltage (≤59.3 V) among equivalents, making it optimal for space-limited automotive power rail protection where both energy absorption and voltage limiting are critical.
Availability
1KSMB43CAH is available at Aetrix Electronics and suitable for automotive infotainment systems, LED lighting drivers, and industrial CAN node protection requiring stable component supply and AEC-Q101-compliant transient suppression.
Supply support for 1KSMB43CAH 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 1KSMBxxCAH series is part of TSC's AEC-Q101-qualified TVS portfolio designed specifically for robust, surface-mount transient protection in automotive power distribution, lighting, and communication subsystems.
FAQ
What does the 'CAH' suffix indicate in 1KSMB43CAH?
The 'CAH' suffix in 1KSMB43CAH denotes a bi-directional configuration, meaning the device provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike uni-directional variants (e.g., 1KSMB43AH), the 1KSMB43CAH has no designated anode or cathode and functions identically regardless of polarity applied across its terminals. This makes it ideal for protecting AC-coupled or floating signal lines and ungrounded power rails where bidirectional surge events occur.
Is 1KSMB43CAH suitable for ISO 7637-2 Pulse 1 testing?
Yes, 1KSMB43CAH is explicitly rated to meet ISO 7637-2 Pulse 1 (inductive load dump) requirements. Its 1000 W peak pulse power rating and ≤59.3 V clamping voltage at 16.9 A ensure it can safely absorb the high-energy, long-duration transients typical of automotive battery disconnection events. The device's thermal resistance (RθJL = 20°C/W) and junction temperature rating (TJ max = +175°C) further support reliable operation under repeated Pulse 1 stress conditions.
What is the maximum reverse leakage current for 1KSMB43CAH at its stand-off voltage?
The maximum reverse leakage current for 1KSMB43CAH is 1.0 µA at its rated stand-off voltage (VWM) of 36.8 V, measured at TA = 25°C. This low leakage ensures minimal power loss and avoids unintended biasing of downstream circuits during normal operation, making the 1KSMB43CAH appropriate for always-on automotive modules such as body control units and telematics gateways.
Does 1KSMB43CAH require special handling due to moisture sensitivity?
No, 1KSMB43CAH is rated at Moisture Sensitivity Level 1 per J-STD-020, meaning it may be stored indefinitely at ambient conditions (≤30°C / 85% RH) and processed using standard SMT reflow profiles without pre-baking or dry-pack requirements. This simplifies manufacturing logistics and eliminates yield risk associated with moisture-related popcorning during reflow, supporting high-volume automotive electronics production.
How does the glass passivated junction benefit 1KSMB43CAH in automotive applications?
The glass passivated junction in 1KSMB43CAH improves long-term parameter stability under thermal cycling and high-humidity conditions typical of automotive under-hood environments. It prevents metallurgical degradation at the silicon surface, maintaining consistent VBR and VC performance over 15+ years of service life. This directly supports AEC-Q101 qualification and ensures reliable transient suppression throughout the vehicle's operational lifetime.
1KSMB43CAH 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):
- 36.8V
- Voltage - Breakdown (Min):
- 40.9V
- Voltage - Clamping (Max) @ Ipp:
- 59.3V
- Current - Peak Pulse (10/1000µs):
- 16.9A
- 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)
1KSMB43CAH FAQ
1.How can I place an order for 1KSMB43CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for 1KSMB43CAH 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 1KSMB43CAH reliable?
The price and inventory of 1KSMB43CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1KSMB43CAH is usually 5 days.
3.What payment methods are accepted for 1KSMB43CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1KSMB43CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1KSMB43CAH?
1KSMB43CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1KSMB43CAH 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 1KSMB43CAH?
For technical support, including 1KSMB43CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1KSMB43CAH requirements.
6.How does Aetrix verify that 1KSMB43CAH is sourced from the original manufacturer or authorized distributors?
All 1KSMB43CAH 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 1KSMB43CAH meets industry standards.
7.What is the process for return or replacement of 1KSMB43CAH?
All 1KSMB43CAH units undergo pre-shipment inspection (PSI). If there is an issue with 1KSMB43CAH, 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 1KSMB43CAH part is unused and in its original packaging.
Return procedure for 1KSMB43CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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