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Taiwan Semiconductor Corporation 1KSMB27CA
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- Part No.:
- 1KSMB27CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1KSMB27CA.pdf
- Description:
- TVS DIODE 23.1VWM 37.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,029
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Product details
Overview
1KSMB27CA from Taiwan Semiconductor is a bi-directional 1000W transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, with breakdown voltage 25.7–28.4 V at 1 mA, stand-off voltage 23.1 V, maximum clamping voltage 37.5 V at 26.7 A, and junction temperature range −55 °C to +175 °C. It protects DC power rails and signal lines in switching mode power supplies, adapters, and display electronics against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the 1KSMB27CA datasheet, 1KSMB27CA pinout, 1KSMB27CA application, or 1KSMB27CA equivalent, key selection criteria include bi-directional clamping capability, 1000 W 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 1KSMB27CA is a glass-passivated, single-die, bi-directional TVS diode designed for fast transient suppression on unidirectional or bidirectional signal/power lines. Its sub-1 ps response time ensures clamping before sensitive circuitry sustains damage, and its 20 °C/W junction-to-lead thermal resistance supports reliable power dissipation under repetitive surge conditions.
It meets ISO 7637-2 automotive transient immunity requirements (Pulse 1, 2a, 2b, 3a, 3b), operates across −55 °C to +175 °C, and features matte tin-plated leads compliant with J-STD-002 solderability and JESD 201 Class 2 whisker resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR min/max | 25.7 V / 28.4 V at 1 mA - defines minimum voltage at which device enters avalanche conduction; sets lower bound for clamping onset |
| VWM | 23.1 V - maximum continuous reverse working voltage; must exceed normal operating voltage to avoid leakage or conduction |
| VC@IPP | 37.5 V at 26.7 A - clamped voltage during 10/1000 µs surge; determines worst-case overvoltage seen by protected IC |
| PPPSM | 1000 W - peak pulse power handling for 10/1000 µs waveform; defines surge energy absorption capacity |
| TJ max | +175 °C - maximum junction temperature; enables operation in high-ambient industrial or under-hood automotive environments |
| RθJL | 20 °C/W - thermal resistance from junction to lead; critical for estimating temperature rise during surge events |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, bi-directional configuration with cathode band omitted (no polarity marking required).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bi-directional avalanche terminals | Either terminal serves as anode or cathode depending on transient polarity; no fixed polarity assignment |
| Case (cathode band absent) | Non-functional mechanical reference | DO-214AA body provides mechanical mounting only; no electrical connection or thermal path beyond leadframe |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Enables stable, repeatable avalanche characteristics and long-term reliability under repeated surge stress |
| Response time <1.0 ps | Clamps transients before propagation into downstream logic or analog circuitry, minimizing risk of latch-up or damage |
| ISO 7637-2 compliance | Validated for automotive-level load dump and supply line transients (Pulse 1/2a/2b/3a/3b), enabling drop-in use in vehicle ECUs |
| Moisture sensitivity level 1 | Eliminates need for baking prior to reflow; supports standard SMT assembly without special handling |
| Halogen-free & RoHS compliant | Meets environmental regulations for consumer, industrial, and automotive end equipment without compromising performance |
Applications
| Automotive Body Control Module (BCM) | Industrial AC-DC Adapter Input Stage |
|---|---|
Use Scenario: Protects LIN bus interface and power input of BCM against battery line transients including load dump and jump-start spikes. IC Role / Device Role / Timing Role: Bi-directional TVS clamping element placed directly at connector entry point to shunt surge current away from MCU and CAN/LIN transceivers. Use Value: Withstand 1000 W pulses while limiting clamped voltage to 37.5 V, ensuring MCU VCC rail remains within safe operating range during ISO 7637-2 Pulse 2b. | Use Scenario: Shields primary-side rectifier and controller IC in universal-input offline adapters from surges induced by mains switching or lightning-induced coupling. IC Role / Device Role / Timing Role: Standoff-rated TVS placed across bulk capacitor input to clamp differential-mode transients before they propagate to PWM controller and MOSFET gate drivers. Use Value: 23.1 V stand-off voltage exceeds 18 V DC output of bridge rectifier under 100 VAC input, preventing false triggering while maintaining 37.5 V clamping ceiling. |
| Consumer Monitor Power Supply | Point-of-Sale (POS) Terminal USB Port Protection |
Use Scenario: Safeguards secondary-side 24 V DC distribution network in LCD monitor power boards against ESD and inductive kickback from backlight inverters. IC Role / Device Role / Timing Role: Bi-directional TVS mounted at 24 V rail entry to main board, absorbing both positive and negative polarity transients generated by cold-cathode fluorescent lamp (CCFL) driver switching. Use Value: 1000 W rating handles repetitive 26.7 A surges from CCFL transformer flyback, with 37.5 V clamping preserving voltage margin for 24 V ±10% logic and display timing ICs. | Use Scenario: Provides robust ESD and surge protection on VBUS and D+/D− lines of USB 2.0 ports in retail POS terminals exposed to frequent human contact and AC adapter coupling. IC Role / Device Role / Timing Role: Low-capacitance bi-directional TVS placed immediately after USB connector to divert >8 kV HBM ESD and 1 kV IEC 61000-4-5 surges before reaching USB PHY. Use Value: Sub-1 ps response captures fast ESD events; symmetrical clamping ensures equal protection on both data lines without skew or signal integrity degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ27CA (Bourns) | Same DO-214AA package, identical VBR (25.7–28.4 V), but higher VC = 43.0 V at 23.3 A; 1000 W rating maintained | Higher clamping voltage reduces design margin for 24 V systems; suitable where layout allows higher transient overshoot | Select SMBJ27CA only if system-level testing confirms 43.0 V clamping remains within protected IC's absolute maximum ratings |
| P6SMB27CA (ON Semiconductor) | Identical electrical specs (VBR, VWM, VC, PPPSM) and DO-214AA package; same MSL 1 and RoHS/halogen-free status | No functional difference; validated in same automotive and industrial applications per manufacturer documentation | P6SMB27CA is a direct second-source option with identical performance and qualification-ideal for BOM diversification without redesign |
Compared with SMBJ27CA and P6SMB27CA, the 1KSMB27CA offers identical clamping performance to P6SMB27CA but lower clamping voltage than SMBJ27CA, making it preferable for 24 V systems with tight overvoltage margins; all three support automated placement and meet ISO 7637-2, though only P6SMB27CA and 1KSMB27CA share exact VC specification.
Availability
1KSMB27CA is available at Aetrix Electronics and suitable for switching mode power supplies, industrial adapters, and display electronics requiring stable component supply with full traceability and lifecycle management.
Supply support for 1KSMB27CA 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 qualified products.
The 1KSMBxxCA series is part of TSC's SMB-format TVS portfolio, engineered for high-reliability transient suppression in automotive, industrial, and consumer power electronics where compact size, high surge rating, and rapid response are essential.
FAQ
What does the 'CA' suffix indicate in 1KSMB27CA?
The 'CA' suffix in 1KSMB27CA denotes a bi-directional configuration, meaning the device functions identically for both positive and negative polarity transients without requiring external polarity orientation. Unlike unidirectional variants (e.g., 1KSMB27A), the 1KSMB27CA has no cathode band marking and is symmetrically constructed for use on AC-coupled or floating signal lines where voltage polarity is undefined or reversible.
Is 1KSMB27CA compatible with lead-free reflow soldering processes?
Yes, 1KSMB27CA is fully compatible with lead-free reflow soldering. Its matte tin-plated leads meet J-STD-002 solderability requirements, and its DO-214AA package is rated for moisture sensitivity level 1 per J-STD-020, eliminating the need for pre-baking. The device supports peak reflow temperatures up to 260 °C and is qualified for standard IPC/JEDEC profiles used in high-volume SMT assembly.
How does the 1000 W rating of 1KSMB27CA relate to real-world surge testing?
The 1000 W rating of 1KSMB27CA corresponds to its peak pulse power dissipation under a standardized 10/1000 µs double-exponential waveform per ANSI/IEEE C62.35. In practice, this translates to withstanding a 26.7 A surge current while clamping to 37.5 V - verified in lab tests per ISO 7637-2 Pulse 1 (inductive switch-off) and Pulse 2b (battery feed interruption), confirming suitability for automotive and industrial transient environments.
Can 1KSMB27CA be used in place of a unidirectional TVS like 1KSMB27A?
No, 1KSMB27CA cannot be used as a direct replacement for 1KSMB27A in circuits requiring unidirectional clamping, such as DC power rail protection with defined polarity. While both share identical VBR, VWM, and VC values, the 1KSMB27CA lacks polarity marking and conducts equally in both directions - potentially causing unintended conduction or increased leakage in DC-biased applications where reverse blocking is required.
What is the maximum steady-state power dissipation for 1KSMB27CA at room temperature?
The maximum steady-state power dissipation for 1KSMB27CA at ambient temperature (TA) = 25 °C is 5 W, as specified in its Absolute Maximum Ratings table. This value applies only to continuous DC or low-frequency reverse bias conditions - not transient events. For sustained operation, thermal design must ensure junction temperature stays ≤175 °C, using the 20 °C/W junction-to-lead thermal resistance to calculate allowable power based on heatsinking and PCB copper area.
1KSMB27CA 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):
- 23.1V
- Voltage - Breakdown (Min):
- 25.7V
- Voltage - Clamping (Max) @ Ipp:
- 37.5V
- Current - Peak Pulse (10/1000µs):
- 26.7A
- 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)
1KSMB27CA FAQ
1.How can I place an order for 1KSMB27CA through Aetrix?
Please submit a Request for Quotation (RFQ) for 1KSMB27CA 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 1KSMB27CA reliable?
The price and inventory of 1KSMB27CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1KSMB27CA is usually 5 days.
3.What payment methods are accepted for 1KSMB27CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1KSMB27CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1KSMB27CA?
1KSMB27CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1KSMB27CA 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 1KSMB27CA?
For technical support, including 1KSMB27CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1KSMB27CA requirements.
6.How does Aetrix verify that 1KSMB27CA is sourced from the original manufacturer or authorized distributors?
All 1KSMB27CA 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 1KSMB27CA meets industry standards.
7.What is the process for return or replacement of 1KSMB27CA?
All 1KSMB27CA units undergo pre-shipment inspection (PSI). If there is an issue with 1KSMB27CA, 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 1KSMB27CA part is unused and in its original packaging.
Return procedure for 1KSMB27CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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