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Taiwan Semiconductor Corporation 1KSMB43A
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- Part No.:
- 1KSMB43A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1KSMB43A.pdf
- Description:
- TVS DIODE 36.8VWM 59.3VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,035
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Product details
Overview
1KSMB43A from Taiwan Semiconductor is a unidirectional 1000W surface-mount Transient Voltage Suppressor (TVS) diode in DO-214AA (SMB) package, with breakdown voltage 40.9–45.2 V, stand-off voltage 36.8 V, clamping voltage 59.3 V at 16.9 A peak pulse current, and junction temperature range −55 °C to +175 °C. It protects DC power rails in switching mode power supplies against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the 1KSMB43A datasheet, 1KSMB43A pinout, 1KSMB43A application, or 1KSMB43A equivalent, key selection criteria include unidirectional polarity, 1000 W peak pulse power rating, 36.8 V working voltage, sub-1 ps response time, and compliance with automotive transient immunity standards.
Technical Context
The 1KSMB43A operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its 40.9–45.2 V breakdown threshold. Its glass-passivated junction ensures stable clamping performance under repetitive surge stress, and it delivers 59.3 V clamping voltage at 16.9 A (10/1000 µs waveform), limiting downstream voltage excursion during fast transients.
Thermally, it features 20 °C/W junction-to-lead resistance and 100 °C/W junction-to-ambient resistance, enabling reliable operation up to 175 °C junction temperature. It meets JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1, supporting standard reflow assembly without preconditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR min/max | 40.9 V / 45.2 V - defines minimum and maximum voltage at which device enters avalanche conduction under 1 mA test current |
| VWM | 36.8 V - maximum continuous reverse operating voltage before leakage exceeds 1 µA |
| VC@IPP | 59.3 V @ 16.9 A - clamped voltage seen by protected circuit during 10/1000 µs surge event |
| PPPSM | 1000 W - peak pulse power handling capability per single non-repetitive 10/1000 µs transient |
| TJ max | +175 °C - maximum allowable junction temperature for sustained reliability in high-ambient environments |
| Response time | <1.0 ps - time from 0 V to VBR min, enabling protection of high-speed digital and analog interfaces |
| Package | DO-214AA (SMB) - industry-standard surface-mount outline with 0.110 g mass and UL 94V-0 molding compound |
Pinout & Package
DO-214AA (SMB) package: cathode-banded end denotes cathode terminal; anode is unmarked end. Matte tin-plated leads comply with J-STD-002 solderability requirements. Polarity is marked on body per standard diode convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when voltage exceeds VBR |
| Anode (unmarked end) | Reference node | Typically tied to system ground or low-impedance return path to complete clamping loop |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures long-term stability of breakdown voltage and leakage under thermal cycling and humidity exposure |
| ISO 7637-2 compliance | Validated for automotive-grade transient immunity (Pulse 1, 2a, 2b, 3a, 3b), enabling use in vehicle ECUs and infotainment systems |
| Sub-1 ps response | Protects sensitive ICs before ESD or lightning-induced surges propagate through PCB traces |
| Moisture Sensitivity Level 1 | Eliminates need for dry-packaging or baking prior to SMT reflow, reducing manufacturing overhead |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally constrained applications |
Applications
| Switching Mode Power Supply (SMPS) | Automotive Infotainment System |
|---|---|
Use Scenario: Input rectifier stage of 24 V DC-DC converter subjected to load dump and jump-start transients. IC Role / Device Role: Unidirectional TVS placed across input bus to clamp surges before upstream controller and MOSFETs. Use Value: Limits voltage to ≤59.3 V during 1000 W transients, preventing overvoltage failure of 60 V-rated input capacitors and controllers. | Use Scenario: USB-C power delivery interface in head unit exposed to ISO 7637-2 Pulse 2b (inductive switch-off). IC Role / Device Role: Line-side transient suppressor on 12 V auxiliary rail feeding USB PD controller and level shifters. Use Value: Clamps 36.8 V stand-off rail to 59.3 V within <1 ps, preserving signal integrity and preventing latch-up in USB PHY ICs. |
| Industrial AC-DC Adapter | LED Video Wall Power Module |
Use Scenario: Secondary-side 36 V output rail of universal-input adapter powering PLC I/O modules. IC Role / Device Role: Output-side TVS protecting isolated feedback optocoupler and shunt regulator from backfeed surges. Use Value: Maintains 36.8 V nominal operation while suppressing 1000 W transients-critical for maintaining regulation accuracy and isolation barrier integrity. | Use Scenario: 48 V distributed power bus feeding LED driver ICs in outdoor signage with ambient temperatures up to 70 °C. IC Role / Device Role: Bus-level TVS mounted near main connector to absorb induced surges from nearby motor drives or lightning coupling. Use Value: Operates reliably at +175 °C junction temperature and withstands repeated 10/1000 µs pulses without parameter drift, ensuring multi-year field life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ43A (Bourns) | Same DO-214AA package; VBR = 45.2–50.0 V; VC = 69.4 V @ 14.4 A; PPPM = 600 W | Lower peak power rating limits use in high-energy automotive load dump scenarios | Select SMBJ43A only if system-level surge energy is confirmed ≤600 W and clamping voltage margin allows 69.4 V |
| 1.5SMC43A (ON Semiconductor) | DO-214AB (SMC) package; VBR = 45.2–50.0 V; VC = 69.4 V @ 14.4 A; PPPM = 1500 W | Larger SMC footprint requires PCB layout change; higher power rating suits industrial motor drive I/O | Choose 1.5SMC43A when board space permits larger package and system demands >1000 W surge handling |
Compared with SMBJ43A and 1.5SMC43A, the 1KSMB43A offers optimal balance of 1000 W surge capacity, SMB footprint compatibility, and 59.3 V clamping-making it preferred for space-constrained automotive and industrial DC rails where both power density and precise voltage limiting are critical.
Availability
1KSMB43A is available at Aetrix Electronics and suitable for switching mode power supplies, automotive infotainment systems, and industrial AC-DC adapters requiring stable component supply and full traceability.
Supply support for 1KSMB43A 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 distribution and AEC-Q200 qualified product lines.
The 1KSMB series was designed specifically for surface-mount transient suppression in automotive, industrial, and consumer power electronics-emphasizing high surge robustness, tight parametric tolerances, and reflow-compatible packaging.
FAQ
What is the polarity configuration of the 1KSMB43A?
The 1KSMB43A is a unidirectional TVS diode, with cathode identified by a band on the DO-214AA (SMB) package body. It conducts only during reverse-voltage transients above its breakdown threshold and blocks forward current like a standard rectifier diode. This polarity is confirmed in the "Devices for Bipolar Applications" note specifying CA suffix for bidirectional variants.
Does the 1KSMB43A meet automotive transient immunity standards?
Yes, the 1KSMB43A meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements as explicitly stated in its features list. Its 1000 W peak pulse power rating and 59.3 V clamping voltage at 16.9 A enable compliance with load dump and inductive switching surge profiles typical in 12 V and 24 V vehicle electrical systems.
What is the maximum clamping voltage of the 1KSMB43A under surge conditions?
The maximum clamping voltage of the 1KSMB43A is 59.3 V at 16.9 A peak pulse current with a 10/1000 µs waveform, as specified in the Electrical Specifications table. This value represents the upper limit of voltage imposed on the protected circuit during worst-case transient events and is measured at TA = 25 °C.
Can the 1KSMB43A be used in bidirectional configurations?
No-the 1KSMB43A is unidirectional only. For bidirectional operation, the designated variant is 1KSMB43CA, which uses a center-tapped die structure and carries the "CA" suffix. The datasheet explicitly states "For Bidirectional use CA suffix", confirming that 1KSMB43A lacks symmetrical breakdown characteristics required for AC-line or data-line protection.
What is the moisture sensitivity level (MSL) and reflow profile guidance for the 1KSMB43A?
The 1KSMB43A has Moisture Sensitivity Level 1 per J-STD-020, meaning it may be stored indefinitely at ≤30 °C/60% RH and requires no baking or dry-packing before standard Pb-free reflow. Its matte tin-plated leads comply with J-STD-002, supporting peak reflow temperatures up to 260 °C for 30 seconds without degradation.
1KSMB43A 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):
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
1KSMB43A FAQ
1.How can I place an order for 1KSMB43A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1KSMB43A 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 1KSMB43A reliable?
The price and inventory of 1KSMB43A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1KSMB43A is usually 5 days.
3.What payment methods are accepted for 1KSMB43A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1KSMB43A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1KSMB43A?
1KSMB43A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1KSMB43A 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 1KSMB43A?
For technical support, including 1KSMB43A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1KSMB43A requirements.
6.How does Aetrix verify that 1KSMB43A is sourced from the original manufacturer or authorized distributors?
All 1KSMB43A 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 1KSMB43A meets industry standards.
7.What is the process for return or replacement of 1KSMB43A?
All 1KSMB43A units undergo pre-shipment inspection (PSI). If there is an issue with 1KSMB43A, 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 1KSMB43A part is unused and in its original packaging.
Return procedure for 1KSMB43A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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