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Taiwan Semiconductor Corporation 1KSMB39CA
- Part No.:
- 1KSMB39CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1KSMB39CA.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,976
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Product details
Overview
1KSMB39CA from Taiwan Semiconductor is a bidirectional 1000W transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, with breakdown voltage 37.1–41.0 V at 1 mA, clamping voltage 53.9 V at 18.6 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 1KSMB39CA datasheet, 1KSMB39CA pinout, 1KSMB39CA application, or 1KSMB39CA equivalent, key selection criteria include bidirectional clamping capability, 1000 W peak pulse power rating, 53.9 V max clamping voltage at 18.6 A, DO-214AA mechanical compatibility, and compliance with J-STD-020 moisture sensitivity level 1.
Technical Context
The 1KSMB39CA uses a glass-passivated silicon junction optimized for fast transient response (<1.0 ps rise time from 0 V to VBR min) and robust clamping under repetitive surge stress. Its bidirectional configuration enables symmetrical protection of AC-coupled or floating signal lines without polarity constraints.
Thermally, it features RθJL = 20 °C/W and RθJA = 100 °C/W, supporting surface-mount placement on standard FR-4 PCBs with adequate copper area. It meets ISO 7637-2 for automotive load-dump and inductive-switching immunity testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 37.1 V / 41.0 V at 1 mA - defines minimum and maximum guaranteed breakdown threshold for reliable overvoltage triggering |
| VWM | 33.3 V - maximum continuous reverse working voltage before leakage exceeds 1 µA, sets safe DC bias limit |
| VC@IPP | 53.9 V at 18.6 A - clamping voltage during 10/1000 µs surge, determines protected circuit's worst-case overvoltage exposure |
| PPPSM | 1000 W - peak pulse power handling per 10/1000 µs waveform, defines transient energy absorption capacity |
| Junction Temp Range | −55 °C to +175 °C - enables operation in under-hood automotive or industrial power supply environments |
| Package | DO-214AA (SMB) - standardized surface-mount outline with 0.110 g mass and UL 94V-0 molding compound |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with matte tin-plated leads, cathode band marking for unidirectional variants; 1KSMB39CA is bidirectional and marked "N10S", with no polarity band - terminals are symmetric and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional transient conduction path | Either terminal serves as anode or cathode depending on instantaneous polarity - enables AC line or floating bus protection without orientation constraints |
| Case | Non-electrical mechanical interface | Plastic body provides insulation and thermal path to PCB copper; no internal connection to die |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity stress |
| Fast response time <1.0 ps | Clamps transients before sensitive downstream ICs experience overstress - critical for protecting high-speed logic and analog inputs |
| ISO 7637-2 compliance | Validated for automotive-grade immunity to load dump, battery disconnect, and inductive switching pulses (Pulse 1/2a/2b/3a/3b) |
| Moisture sensitivity level 1 | Allows unlimited floor life and standard reflow without baking - simplifies SMT manufacturing flow |
Applications
| Switching Mode Power Supply (SMPS) | Consumer Display (TV/Monitor) |
|---|---|
Use Scenario: Input rectifier stage and DC bus lines exposed to line surges and ESD events. IC Role / Device Role / Timing Role: Bidirectional clamping device placed across bulk capacitor or input bridge output. Use Value: Limits transient overvoltage to ≤53.9 V during 1000 W surges, preventing MOSFET gate oxide rupture and controller latch-up. | Use Scenario: HDMI, LVDS, or power input interfaces subject to human-body-model (HBM) ESD and cable discharge events. IC Role / Device Role / Timing Role: Primary board-level ESD and surge protector on external-facing connectors. Use Value: Clamps 8 kV contact ESD (IEC 61000-4-2) within <1 ps, maintaining signal integrity while absorbing >100 A peak current. |
| Automotive Body Control Module | Industrial AC-DC Adapter |
Use Scenario: CAN/LIN bus power rails and sensor supply lines subjected to ISO 7637-2 Pulse 1 (inductive load dump) and Pulse 3b (capacitive coupling). IC Role / Device Role / Timing Role: Secondary overvoltage clamp after primary LC filter, directly at microcontroller power pins. Use Value: Maintains rail voltage below 54 V during 100 V/50 ms load dump, ensuring MCU reset-free operation per ISO 16750-2. | Use Scenario: Output rectification and secondary-side DC bus in universal-input 100–240 VAC adapters. IC Role / Device Role / Timing Role: Transient suppressor across output capacitor to protect downstream USB-PD controllers and load switches. Use Value: Absorbs 1000 W surge energy without degradation, enabling Class II double-insulated design without earth-referenced MOVs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ39CA (Bourns) | Same DO-214AA package; VBR = 43.3–47.9 V, VC = 60.0 V @ 16.7 A - higher clamping voltage, lower peak current rating | Less effective clamping margin for 3.3 V/5 V logic rails; better suited for 12 V+ systems | Select SMBJ39CA only if system overvoltage margin exceeds 60 V and layout allows slightly higher VC |
| P6SMB39CA (ON Semiconductor) | VBR = 41.1–45.4 V, VC = 59.0 V @ 17.0 A - tighter VBR tolerance but 5.1 V higher clamping than 1KSMB39CA | Higher clamping increases risk of downstream component overstress in low-voltage DC distribution networks | Prefer 1KSMB39CA where clamping voltage ≤54 V is required to protect 3.3 V or 5 V ICs |
Compared with SMBJ39CA and P6SMB39CA, the 1KSMB39CA delivers the lowest clamping voltage (53.9 V) among DO-214AA bidirectional 39 V TVS diodes, offering superior protection margin for 3.3 V/5 V logic rails while maintaining full ISO 7637-2 compliance and moisture level 1 manufacturability.
Availability
1KSMB39CA is available at Aetrix Electronics and suitable for switching mode power supplies, consumer displays, and automotive body control modules requiring stable component supply with full traceability and lifecycle management.
Supply support for 1KSMB39CA 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 for industrial and automotive markets.
The 1KSMBxxCA series was designed specifically for high-reliability, surface-mount transient suppression in space-constrained DC power rails where bidirectional clamping, fast response, and ISO 7637-2 compliance are mandatory.
FAQ
What is the breakdown voltage range of the 1KSMB39CA?
The 1KSMB39CA has a guaranteed breakdown voltage range of 37.1 V to 41.0 V measured at 1 mA test current per ANSI/IEEE C62.35. This range ensures consistent triggering across production lots and temperature extremes, and is validated per the official Taiwan Semiconductor datasheet revision I2102. The 1KSMB39CA maintains this specification under both forward and reverse bias due to its bidirectional construction.
Is the 1KSMB39CA unidirectional or bidirectional?
The 1KSMB39CA is a bidirectional TVS diode, indicated by the "CA" suffix per Taiwan Semiconductor's ordering convention. Unlike unidirectional variants (e.g., 1KSMB39A), the 1KSMB39CA conducts symmetrically in both polarities and carries no cathode band marking. Its electrical specifications - including identical VBR, VWM, and VC values for both directions - confirm true bidirectional operation essential for AC-coupled or floating-bus protection.
What is the maximum clamping voltage of the 1KSMB39CA at rated peak current?
The 1KSMB39CA has a maximum clamping voltage of 53.9 V at 18.6 A peak pulse current (10/1000 µs waveform). This value represents the upper limit of voltage seen by protected circuitry during worst-case surge events and is measured per JEDEC standards. The 1KSMB39CA achieves this low clamping performance while sustaining 1000 W peak power, making it suitable for safeguarding 3.3 V and 5 V logic rails in compact layouts.
Does the 1KSMB39CA meet automotive transient immunity standards?
Yes, the 1KSMB39CA meets ISO 7637-2 requirements for Pulse 1 (inductive load dump), Pulse 2a/2b (battery disconnection), and Pulse 3a/3b (capacitive coupling), as explicitly stated in the Taiwan Semiconductor datasheet. Its 1000 W peak power rating, fast <1.0 ps response, and −55 °C to +175 °C junction temperature range make the 1KSMB39CA appropriate for automotive body control modules, infotainment power supplies, and sensor interface protection.
What is the moisture sensitivity level (MSL) of the 1KSMB39CA?
The 1KSMB39CA is rated MSL Level 1 per J-STD-020, meaning it has unlimited floor life at ≤30 °C/60% RH and requires no baking prior to reflow soldering. This rating results from its DO-214AA (SMB) package construction using moisture-resistant molding compound and matte tin-plated leads. The 1KSMB39CA's MSL Level 1 simplifies SMT assembly and eliminates process delays associated with moisture-sensitive components.
1KSMB39CA 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):
- 33.3V
- Voltage - Breakdown (Min):
- 37.1V
- Voltage - Clamping (Max) @ Ipp:
- 53.9V
- Current - Peak Pulse (10/1000µs):
- 18.6A
- 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)
1KSMB39CA FAQ
1.How can I place an order for 1KSMB39CA through Aetrix?
Please submit a Request for Quotation (RFQ) for 1KSMB39CA 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 1KSMB39CA reliable?
The price and inventory of 1KSMB39CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1KSMB39CA is usually 5 days.
3.What payment methods are accepted for 1KSMB39CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1KSMB39CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1KSMB39CA?
1KSMB39CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1KSMB39CA 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 1KSMB39CA?
For technical support, including 1KSMB39CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1KSMB39CA requirements.
6.How does Aetrix verify that 1KSMB39CA is sourced from the original manufacturer or authorized distributors?
All 1KSMB39CA 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 1KSMB39CA meets industry standards.
7.What is the process for return or replacement of 1KSMB39CA?
All 1KSMB39CA units undergo pre-shipment inspection (PSI). If there is an issue with 1KSMB39CA, 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 1KSMB39CA part is unused and in its original packaging.
Return procedure for 1KSMB39CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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