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Taiwan Semiconductor Corporation 1KSMB43CA
- Part No.:
- 1KSMB43CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1KSMB43CA.pdf
- Description:
- TVS DIODE 36.8VWM 59.3VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,912
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Product details
Overview
1KSMB43CA from Taiwan Semiconductor is a bi-directional 1000W transient voltage suppressor (TVS) in DO-214AA (SMB) package, with breakdown voltage 40.9–45.2 V at 1 mA, stand-off voltage 36.8 V, clamping voltage 59.3 V at 16.9 A peak pulse current, and operating junction temperature range −55 °C to +175 °C. It protects DC power rails in switching mode power supplies and consumer displays against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the 1KSMB43CA datasheet, 1KSMB43CA pinout, 1KSMB43CA application, or 1KSMB43CA equivalent, key selection criteria include bi-directional clamping capability, 1000W peak pulse power rating, DO-214AA surface-mount compatibility, moisture sensitivity level 1, and compliance with RoHS and halogen-free standards per IEC 61249-2-21.
Technical Context
The 1KSMB43CA uses a glass passivated silicon junction optimized for fast transient response (<1.0 ps from 0 V to VBR(min)) and stable clamping under repetitive surge stress. Its bi-directional configuration enables symmetric protection of AC-coupled or floating signal lines without polarity dependency.
Thermal performance is defined by RθJL = 20 °C/W and RθJA = 100 °C/W, supporting operation up to 175 °C junction temperature. It meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements for the molding compound.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 40.9 V / 45.2 V at 1 mA - defines reliable conduction onset under bidirectional surge conditions |
| VWM | 36.8 V - maximum continuous reverse working voltage before leakage exceeds 1 µA |
| VC @ IPP | 59.3 V at 16.9 A - clamped voltage during 10/1000 µs surge, limiting downstream stress |
| PPPSM | 1000 W - peak pulse power handling capacity per single 10/1000 µs waveform |
| TJ(max) | +175 °C - maximum junction temperature enabling high-ambient industrial deployment |
| Package | DO-214AA (SMB) - standardized surface-mount outline with 0.110 g mass and matte tin-plated leads |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with cathode band marking for polarity identification; terminals are matte tin-plated, solderable per J-STD-002; weight ≈ 0.110 g; meets UL 94V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Transient return path (bidirectional) | Provides symmetrical low-impedance path to ground or reference during both positive and negative surges |
| Cathode (banded end) | Transient return path (bidirectional) | Same functional role as anode in CA-suffix devices; no polarity-dependent function due to bi-directional design |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure |
| Response time <1.0 ps | Clamps ESD and fast-edge transients before sensitive downstream circuitry sustains damage |
| ISO 7637-2 compliance | Validated protection against automotive load-dump and inductive-switching pulses (Pulse 1/2a/2b/3a/3b) |
| Moisture sensitivity level 1 | Enables standard SMT reflow without baking or special handling prior to assembly |
Applications
| Switching Mode Power Supply (SMPS) | Consumer Display Monitor |
|---|---|
Use Scenario: Input rectifier stage exposed to line surges and coupling noise in 24–48 V DC input SMPS units. IC Role / Device Role / Timing Role: Bi-directional TVS diode providing primary overvoltage clamping across bulk capacitor terminals. Use Value: Limits transient voltage to ≤59.3 V during 10/1000 µs events, preventing MOSFET gate oxide rupture and controller IC latch-up. | Use Scenario: HDMI/DisplayPort interface lines subject to ESD and cable discharge events in flat-panel monitors. IC Role / Device Role / Timing Role: Bidirectional transient suppressor placed inline with differential data pairs to shunt common-mode surges. Use Value: Clamps ±59.3 V peaks while maintaining <1 µA leakage at 36.8 V, preserving signal integrity and eye diagram margin. |
| Automotive Infotainment Head Unit | AC-DC Adapter Protection |
Use Scenario: 12 V supply rail in head units subjected to ISO 7637-2 Pulse 2b (battery disconnect) and Pulse 3b (capacitive discharge). IC Role / Device Role / Timing Role: Primary rail-level TVS on main power input, mounted adjacent to connector entry point. Use Value: Absorbs 1000 W peak energy without failure, sustaining operation after repeated transients per automotive qualification requirements. | Use Scenario: Secondary-side DC output of universal-input adapters (5–24 V), exposed to user-induced plug-in surges and lightning-induced coupling. IC Role / Device Role / Timing Role: Final-stage overvoltage clamp before USB-PD or barrel-jack output connectors. Use Value: Maintains 36.8 V stand-off while clamping to 59.3 V, ensuring connected devices remain within safe absolute maximum ratings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ43CA (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 when lower clamping voltage is secondary to cost and footprint compatibility |
| P6SMB43CA (ON Semiconductor) | Same DO-214AA package; VBR = 45.2–50.0 V; VC = 69.4 V @ 14.4 A; PPPM = 600 W; RθJA = 110 °C/W | Higher thermal resistance reduces sustained surge duty cycle capability | Prefer for legacy BOM continuity where 600 W rating suffices and sourcing favors ON Semi |
Compared with SMBJ43CA and P6SMB43CA, the 1KSMB43CA delivers 1000 W peak power handling and lower clamping voltage (59.3 V vs. ≥69.4 V), enabling robust protection in high-energy transient environments without derating or parallel device stacking.
Availability
1KSMB43CA is available at Aetrix Electronics and suitable for switching mode power supplies, consumer display monitors, and automotive infotainment systems requiring stable component supply, RoHS/halogen-free compliance, and ISO 7637-2 validated surge immunity.
Supply support for 1KSMB43CA 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 protection components for industrial and automotive markets.
The 1KSMBxxCA series was designed specifically for high-reliability, surface-mount transient suppression in space-constrained DC power interfaces where 1000 W surge capability and bi-directional symmetry are required.
FAQ
What is the polarity configuration of the 1KSMB43CA?
The 1KSMB43CA is a bi-directional TVS diode, indicated by the "CA" suffix. It has no functional anode/cathode distinction in circuit operation-both terminals serve as symmetrical surge return paths. The cathode band marking is retained for mechanical orientation consistency but does not imply unidirectional behavior. This allows placement without polarity verification during automated assembly, simplifying layout and reducing misorientation risk in the 1KSMB43CA implementation.
Does the 1KSMB43CA meet automotive transient immunity standards?
Yes, the 1KSMB43CA meets ISO 7637-2 requirements for Pulse 1 (inductive load dump), Pulse 2a (sudden load interruption), Pulse 2b (battery disconnection), Pulse 3a (capacitive coupled spike), and Pulse 3b (capacitive discharge). Its 1000 W peak pulse power rating and sub-1 ps response time ensure effective clamping of these waveforms without degradation. The 1KSMB43CA is routinely used in automotive infotainment and body control modules where such compliance is mandatory.
What is the maximum clamping voltage of the 1KSMB43CA under surge conditions?
The maximum clamping voltage (VC) of the 1KSMB43CA is 59.3 V at a peak pulse current (IPP) of 16.9 A, measured using the standard 10/1000 µs waveform. This value represents the upper limit of voltage seen by protected circuitry during worst-case transient events. Designers use this figure to verify that downstream components-including MOSFETs, controllers, and interface ICs-remain within their absolute maximum voltage ratings when the 1KSMB43CA is active.
Is the 1KSMB43CA compatible with lead-free reflow processes?
Yes, the 1KSMB43CA features matte tin-plated leads compliant with J-STD-002 solderability requirements and rated for standard lead-free reflow profiles (peak temperature up to 260 °C). Its moisture sensitivity level is rated at Level 1 per J-STD-020, meaning it can be stored indefinitely at ambient conditions without baking prior to assembly. These attributes make the 1KSMB43CA fully compatible with modern high-volume SMT lines processing the 1KSMB43CA.
How does the 1KSMB43CA compare to unidirectional variants like 1KSMB43A?
The 1KSMB43CA differs from the unidirectional 1KSMB43A in having symmetrical breakdown characteristics-identical VBR and VC for both polarities-making it suitable for AC-coupled, floating, or bidirectional signal lines. In contrast, 1KSMB43A conducts only in reverse bias and blocks forward current. The 1KSMB43CA's bi-directional nature eliminates need for polarity-aware routing and supports protection of differential buses, audio lines, or isolated DC rails where voltage reversal may occur.
1KSMB43CA 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
1KSMB43CA FAQ
1.How can I place an order for 1KSMB43CA through Aetrix?
Please submit a Request for Quotation (RFQ) for 1KSMB43CA 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 1KSMB43CA reliable?
The price and inventory of 1KSMB43CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1KSMB43CA is usually 5 days.
3.What payment methods are accepted for 1KSMB43CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1KSMB43CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1KSMB43CA?
1KSMB43CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1KSMB43CA 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 1KSMB43CA?
For technical support, including 1KSMB43CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1KSMB43CA requirements.
6.How does Aetrix verify that 1KSMB43CA is sourced from the original manufacturer or authorized distributors?
All 1KSMB43CA 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 1KSMB43CA meets industry standards.
7.What is the process for return or replacement of 1KSMB43CA?
All 1KSMB43CA units undergo pre-shipment inspection (PSI). If there is an issue with 1KSMB43CA, 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 1KSMB43CA part is unused and in its original packaging.
Return procedure for 1KSMB43CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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