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Taiwan Semiconductor Corporation 1KSMB27A
- Part No.:
- 1KSMB27A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1KSMB27A.pdf
- Description:
- TVS DIODE 23.1VWM 37.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,123
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Product details
Overview
1KSMB27A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, rated for 1000W peak pulse power, 25.7–28.4V breakdown voltage (VBR), and 37.5V maximum clamping voltage (VC@IPP). It protects DC power rails in switching mode power supplies and adapters against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the 1KSMB27A datasheet, 1KSMB27A pinout, 1KSMB27A application, or 1KSMB27A equivalent, key selection criteria include standoff voltage (23.1V), clamping performance under 26.7A peak impulse current, thermal resistance (RθJL = 20°C/W), moisture sensitivity level (MSL 1), and RoHS/halogen-free compliance.
Technical Context
The 1KSMB27A operates as a single-die, unidirectional avalanche diode with glass-passivated junction, enabling sub-1ps response to fast-rising transients. Its clamping action begins at VBR ≥ 25.7V and limits reverse surge to ≤37.5V at 26.7A (10/1000µs waveform), maintaining circuit integrity during automotive load dump or inductive switching events.
Designed for surface-mount automated placement, it features matte tin-plated leads compliant with J-STD-002 solderability and JESD 201 Class 2 whisker resistance. Polarity is marked by cathode band; junction temperature range spans –55°C to +175°C with UL 94V-0 molding compound.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR min/max | 25.7V / 28.4V - defines minimum voltage at which avalanche conduction initiates reliably under 1mA test current |
| VWM | 23.1V - maximum continuous reverse operating voltage before leakage exceeds 1µA |
| VC@IPP | 37.5V @ 26.7A - clamped voltage during 10/1000µs transient, limiting downstream IC stress |
| PPPSM | 1000W - peak pulse power handling capability per single non-repetitive event |
| RθJL | 20°C/W - junction-to-lead thermal resistance enables efficient heat transfer to PCB copper |
| MSL | Level 1 per J-STD-020 - no floor life limitation; safe for standard reflow without dry pack |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, single-ended unidirectional configuration with cathode band marking. Body dimensions: 4.57 × 3.94 × 2.29 mm (L × W × H). Weight: 0.110g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-impedance return path; carries full surge current during clamping |
| Cathode | High-side transient input | Connected to protected line (e.g., 24V rail); polarity mark indicates direction of suppression |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling |
| Sub-1ps response time | Activates before most microsecond-scale transients fully develop, preventing upstream damage |
| ISO 7637-2 compliance | Validated for automotive-grade immunity to Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnect), and Pulse 3a/3b (line spikes) |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally constrained designs |
Applications
| Switching Mode Power Supply (SMPS) | AC-DC Adapter |
|---|---|
Use Scenario: Input rectifier stage subjected to line surges and hot-plug transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed across bulk capacitor to clamp positive-going overvoltage spikes. Use Value: Limits voltage to ≤37.5V during 26.7A transients, protecting primary-side controller and MOSFET gate drivers. | Use Scenario: Secondary-side 24V output rail exposed to load dump from connected peripherals. IC Role / Device Role / Timing Role: Standoff-rated TVS on regulated DC output to absorb energy from cable disconnection events. Use Value: Maintains VWM = 23.1V while clamping to 37.5V, preserving downstream USB-PD or PoE interface ICs. |
| Industrial Monitor Power Input | Automotive Infotainment Display |
Use Scenario: 24V DC input of panel-mounted monitor encountering ESD and conducted noise from adjacent equipment. IC Role / Device Role / Timing Role: First-line protection device ahead of input filter and DC-DC converter. Use Value: Withstands 1000W pulses without degradation, ensuring >100,000 surge cycles per JEDEC JESD22-A114F. | Use Scenario: 12V/24V supply rail in head unit exposed to ISO 7637-2 Pulse 2b (battery feed interruption). IC Role / Device Role / Timing Role: Automotive-qualified TVS integrated into power entry module for EMC robustness. Use Value: MSL Level 1 and –55°C to +175°C operation support AEC-Q200 pre-compliance in harsh cabin environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ27A (Bourns) | Same DO-214AA package, identical VBR (25.7–28.4V), but VC = 43.5V @ 23.1A - 15.9% higher clamping voltage | Higher clamping reduces margin for 3.3V/5V logic protection; better suited for 24V+ systems with wider voltage tolerance | Select SMBJ27A only if board layout allows higher VC and system withstand voltage exceeds 43.5V |
| 1.5SMC27A (ON Semiconductor) | DO-214AB (SMC) package - 7.11 × 6.22 mm vs. SMB's 4.57 × 3.94 mm; same electrical specs but 30% larger footprint and 2× thermal mass | Requires PCB redesign; superior heat dissipation supports higher duty-cycle surge exposure | Choose 1.5SMC27A when thermal derating or repetitive surge testing drives need for lower RθJA (50°C/W vs. 100°C/W) |
Compared with SMBJ27A and 1.5SMC27A, the 1KSMB27A delivers tighter clamping (37.5V), smaller SMB footprint, and MSL Level 1 handling - making it optimal for space-constrained, high-volume industrial adapters where surge repetition is infrequent and layout reuse is critical.
Availability
1KSMB27A is available at Aetrix Electronics and suitable for switching mode power supplies, AC-DC adapters, and industrial monitors requiring stable component supply, consistent parametric performance, and full traceability across production lots.
Supply support for 1KSMB27A 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving global industrial, computing, and consumer markets since 1979.
The 1KSMB series belongs to TSC's transient voltage suppressor product line, engineered specifically for high-power, surface-mount surge protection in automotive and industrial power conversion systems where reliability under ISO 7637-2 stress is mandatory.
FAQ
What is the maximum clamping voltage of the 1KSMB27A under standard test conditions?
The 1KSMB27A has a maximum clamping voltage (VC) of 37.5V when subjected to a 10/1000µs waveform peak impulse current of 26.7A at TA = 25°C. This value is measured across the device terminals during transient conduction and ensures downstream components remain within safe operating voltage limits during surge events.
Is the 1KSMB27A suitable for bidirectional transient suppression?
No, the 1KSMB27A is unidirectional. For bidirectional protection, the 1KSMB27CA variant must be used. The "A" suffix denotes unidirectional operation with cathode band marking; "CA" indicates symmetrical breakdown in both polarities and requires different circuit integration - such as placement across differential lines or AC inputs.
What is the standoff voltage rating for the 1KSMB27A, and how does it relate to system design?
The 1KSMB27A has a maximum standoff voltage (VWM) of 23.1V, meaning it remains in high-impedance state up to this DC or RMS voltage. Designers must ensure nominal system voltage (e.g., 24V rail) stays below VWM with margin - typically ≤90% - to avoid leakage-induced power loss or thermal drift during continuous operation.
Does the 1KSMB27A require special handling during PCB assembly?
No special handling is required: the 1KSMB27A is rated MSL Level 1 per J-STD-020, meaning it may be stored indefinitely at ambient conditions and processed through standard lead-free reflow profiles without baking. Its matte tin-plated leads meet J-STD-002 for solderability, and UL 94V-0 molding compound resists charring during thermal excursions.
How does the 1KSMB27A compare to older SMA-package TVS diodes in terms of surge capability?
The 1KSMB27A in DO-214AA (SMB) offers 1000W peak pulse power - 25% higher than typical SMA-package devices (e.g., SMAJ27A at 600W) - due to improved thermal path and larger die area. Its RθJL of 20°C/W enables faster heat transfer to the PCB, supporting more aggressive surge repetition rates without junction overheating.
1KSMB27A 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):
- 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)
1KSMB27A FAQ
1.How can I place an order for 1KSMB27A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1KSMB27A 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 1KSMB27A reliable?
The price and inventory of 1KSMB27A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1KSMB27A is usually 5 days.
3.What payment methods are accepted for 1KSMB27A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1KSMB27A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1KSMB27A?
1KSMB27A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1KSMB27A 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 1KSMB27A?
For technical support, including 1KSMB27A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1KSMB27A requirements.
6.How does Aetrix verify that 1KSMB27A is sourced from the original manufacturer or authorized distributors?
All 1KSMB27A 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 1KSMB27A meets industry standards.
7.What is the process for return or replacement of 1KSMB27A?
All 1KSMB27A units undergo pre-shipment inspection (PSI). If there is an issue with 1KSMB27A, 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 1KSMB27A part is unused and in its original packaging.
Return procedure for 1KSMB27A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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