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Taiwan Semiconductor Corporation 1KSMB39CAH
- Part No.:
- 1KSMB39CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1KSMB39CAH.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,470
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Product details
Overview
1KSMB39CAH from Taiwan Semiconductor is a bi-directional 1000W surface-mount Transient Voltage Suppressor in DO-214AA (SMB) package, with breakdown voltage 37.1–41.0 V at 1 mA, stand-off voltage 33.3 V, clamping voltage 53.9 V at 18.6 A, and AEC-Q101 qualification for automotive-grade reliability.
For engineers reviewing the 1KSMB39CAH datasheet, 1KSMB39CAH pinout, 1KSMB39CAH application, or 1KSMB39CAH equivalent, this TVS diode delivers precise bidirectional surge protection for automotive electronics, industrial control interfaces, and lighting systems requiring ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance and robust ESD immunity.
Technical Context
The 1KSMB39CAH employs a glass-passivated silicon junction optimized for fast transient response (<1.0 ps rise time from 0 V to VBR(min)) and stable clamping under repetitive or single high-energy surges. 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 from –55 °C to +175 °C junction temperature. It meets JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 37.1 V / 41.0 V - Ensures reliable triggering above system operating voltage while maintaining margin against false clamping |
| VWM | 33.3 V - Maximum continuous reverse working voltage compatible with 33 V nominal bus systems |
| VC@IPP | 53.9 V at 18.6 A - Clamps transients to safe levels for downstream 5V/3.3V logic or analog ICs |
| PPPSM | 1000 W - Handles high-energy ISO 7637-2 Pulse 1 (inductive load dump) and Pulse 3b (EFT bursts) |
| IPP | 18.6 A - Peak impulse current capability for 10/1000 µs waveform, enabling robust front-end protection |
| TJ(max) | +175 °C - Supports under-hood automotive placement and high-ambient industrial environments |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, bi-directional configuration with cathode band omitted (symmetrical terminals). Matte tin-plated leads, UL 94V-0 molding compound, 0.110 g weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional transient path | No polarity marking required; either terminal serves as input/output for AC or floating lines |
| Case (body) | Thermal conduction path | DO-214AA outline provides mechanical stability and thermal dissipation via PCB copper pour |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive powertrain, body electronics, and ADAS modules per stress test requirements |
| Glass passivated junction | Enhances long-term reliability and leakage stability under thermal cycling and humidity exposure |
| ISO 7637-2 compliant | Guarantees immunity to real-world vehicle electrical disturbances including load dump and EFT pulses |
| Moisture sensitivity level 1 | Enables direct use without baking or special handling-compatible with standard SMT reflow processes |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting LIN/CAN node power rails from battery transients and load dump events in passenger vehicles. IC Role / Device Role / Timing Role: Primary bidirectional clamping device placed between fused 12 V supply and regulator input. Use Value: Limits voltage excursion to ≤53.9 V during 1000 W surges, preventing regulator latch-up or LDO failure. | Use Scenario: Safeguarding 4–20 mA current loop transmitters exposed to field wiring ESD and inductive kickback. IC Role / Device Role / Timing Role: Front-end transient suppressor across loop supply terminals before precision current source circuitry. Use Value: Absorbs >18 A peak surges without degradation, preserving measurement accuracy and sensor longevity. |
| LED Driver Input Protection | AC-Coupled Communication Line Protection |
Use Scenario: Shielding constant-current LED drivers in headlamp modules from alternator ripple and ignition noise. IC Role / Device Role / Timing Role: Parallel-connected TVS on DC input rail upstream of buck controller and gate driver. Use Value: Maintains 33.3 V stand-off while clamping spikes to 53.9 V, avoiding overvoltage shutdown of PWM ICs. | Use Scenario: Protecting RS-485 or CAN FD differential pairs in factory automation gateways. IC Role / Device Role / Timing Role: Bi-directional clamp across A/B lines referenced to common-mode ground plane. Use Value: Symmetric clamping ensures equal protection for both polarities of fast transients without bias network. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ36CA | 36 V VBR min (34.2–37.8 V), same SMB package, 1000 W rating | Lower clamping voltage (50 V @ 19.7 A); better suited for 33 V systems with tighter margin | Select when VWM ≤ 30.8 V is required and lower VC improves downstream IC survivability |
| 1.5KE39CA | Through-hole DO-201 package, same 39 V rating, 1500 W PPPM, higher IPP (38.9 A) | Not surface-mountable; unsuitable for automated assembly or space-constrained layouts | Choose only for legacy through-hole designs or where higher surge energy tolerance outweighs SMT compatibility |
Compared with SMBJ36CA and 1.5KE39CA, the 1KSMB39CAH offers optimal balance of AEC-Q101 qualification, SMB footprint, and 33.3 V stand-off-making it preferred for new automotive and industrial SMT designs requiring validated reliability and process compatibility.
Availability
1KSMB39CAH is available at Aetrix Electronics and suitable for automotive power line protection, industrial sensor interface protection, and LED driver input protection requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for 1KSMB39CAH 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-Q101 validation capability.
The 1KSMBxxCAH series is designed specifically for high-reliability automotive and industrial transient suppression, emphasizing robustness under ISO 7637-2 stress, moisture resilience, and automated SMT compatibility.
FAQ
What does the 'CAH' suffix indicate in 1KSMB39CAH?
The 'CAH' suffix denotes a bi-directional configuration, meaning the 1KSMB39CAH functions identically in both polarities-ideal for protecting AC-coupled signals, floating buses, or systems where voltage polarity reversal may occur. Unlike unidirectional variants (e.g., 1KSMB39AH), it has no cathode marking and requires no orientation during placement.
Is 1KSMB39CAH suitable for ISO 7637-2 Pulse 1 testing?
Yes, the 1KSMB39CAH is explicitly rated to meet ISO 7637-2 Pulse 1 (inductive load dump) and Pulse 2a/2b/3a/3b requirements. Its 1000 W peak pulse power rating and 53.9 V clamping voltage at 18.6 A ensure compliance when properly mounted with adequate PCB copper area for thermal dissipation.
What is the maximum operating temperature for 1KSMB39CAH?
The 1KSMB39CAH supports a junction temperature range of –55 °C to +175 °C. This allows deployment in under-hood automotive locations and high-ambient industrial enclosures. Derating begins above 25 °C ambient per the published pulse derating curve (Fig. 2 in datasheet).
Does 1KSMB39CAH require special handling due to moisture sensitivity?
No-1KSMB39CAH is rated at Moisture Sensitivity Level 1 per J-STD-020, meaning it can be stored indefinitely at ≤30 °C/60% RH and processed directly in standard SMT reflow without baking or dry-pack requirements, simplifying manufacturing logistics.
How does the clamping voltage of 1KSMB39CAH compare to its breakdown voltage?
The 1KSMB39CAH has a breakdown voltage range of 37.1–41.0 V at 1 mA and clamps to 53.9 V at 18.6 A (10/1000 µs pulse). This ~31% overvoltage margin ensures protected circuits remain within safe operating limits while accommodating surge energy without device failure.
1KSMB39CAH 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
1KSMB39CAH FAQ
1.How can I place an order for 1KSMB39CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for 1KSMB39CAH 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 1KSMB39CAH reliable?
The price and inventory of 1KSMB39CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1KSMB39CAH is usually 5 days.
3.What payment methods are accepted for 1KSMB39CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1KSMB39CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1KSMB39CAH?
1KSMB39CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1KSMB39CAH 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 1KSMB39CAH?
For technical support, including 1KSMB39CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1KSMB39CAH requirements.
6.How does Aetrix verify that 1KSMB39CAH is sourced from the original manufacturer or authorized distributors?
All 1KSMB39CAH 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 1KSMB39CAH meets industry standards.
7.What is the process for return or replacement of 1KSMB39CAH?
All 1KSMB39CAH units undergo pre-shipment inspection (PSI). If there is an issue with 1KSMB39CAH, 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 1KSMB39CAH part is unused and in its original packaging.
Return procedure for 1KSMB39CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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