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Taiwan Semiconductor Corporation P6SMB20A
- Part No.:
- P6SMB20A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
P6SMB20A.pdf
- Description:
- TVS DIODE 17.1VWM 27.7VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,540
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Product details
Overview
P6SMB20A from Taiwan Semiconductor is a unidirectional 600W surface-mount transient voltage suppressor (TVS) diode with a standoff voltage of 17.1 V, breakdown voltage range of 19.0–21.0 V at 1 mA, and clamping voltage of 27.7 V at 22 A peak pulse current. It protects DC power rails in switching mode power supplies, adapters, and display electronics against ESD and surge transients per ISO 7637-2.
For engineers reviewing the P6SMB20A datasheet, P6SMB20A pinout, P6SMB20A application, or P6SMB20A equivalent, key selection criteria include its DO-214AA (SMB) package compatibility, 1 μA max reverse leakage at VWM, 1.0 ps typical response time, and compliance with automotive pulse immunity standards (Pulse 1/2a/2b/3a/3b).
Technical Context
The P6SMB20A operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its specified VBR (19.0–21.0 V), then clamping transient energy to ≤27.7 V at 22 A. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1 μA @ 17.1 V).
Thermal performance is defined by RθJC = 10 °C/W and RθJA = 55 °C/W, supporting operation from –55 °C to +150 °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 |
|---|---|
| VWM | 17.1 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR (min/max) | 19.0 / 21.0 V @ 1 mA - Confirmed breakdown threshold for reliable overvoltage triggering |
| VC @ IPPM | 27.7 V @ 22 A - Clamped voltage during 10/1000 μs surge, limiting downstream stress |
| PPPSM | 600 W - Peak pulse power handling capability under standardized surge waveform |
| IR @ VWM | <1 μA - Ultra-low leakage preserves efficiency in high-impedance bias networks |
| Response time | <1.0 ps - Sub-picosecond turn-on enables protection of fast-edge digital and power circuits |
| TJ max | +150 °C - Enables use in thermally constrained PCB layouts near power components |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, single-diode configuration with cathode band marking. Matte tin-plated leads comply with J-STD-002 solderability requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse surge return path | Connected to protected circuit ground or low-side return; defines unidirectional polarity |
| Cathode | Reverse voltage sensing / Clamping node | Connected to line being protected (e.g., +12 V rail); conducts during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance (±5%) and long-term reliability under thermal cycling |
| ISO 7637-2 compliance | Validated for automotive-grade Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (board-level noise) |
| DO-214AA footprint | Enables automated SMT placement and reflow compatibility with standard SMB land patterns |
| UL 94V-0 molding compound | Provides flame-retardant encapsulation required for safety-critical power supply designs |
Applications
| Switching Mode Power Supply (SMPS) | AC-DC Adapters |
|---|---|
Use Scenario: Protection of primary-side MOSFET gate drivers and secondary-side rectifier outputs against flyback spikes and line surges. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed across DC bus or output rails. Use Value: Limits transient overshoot to ≤27.7 V, preventing gate oxide rupture in MOSFETs and overvoltage failure in output capacitors. | Use Scenario: Input-stage surge suppression in wall-mounted AC-DC adapters subjected to lightning-induced mains transients. IC Role / Device Role / Timing Role: Line-to-ground or line-to-neutral transient clamp on secondary-side DC output. Use Value: Withstands 600 W peak pulses while maintaining <1 μA leakage, preserving no-load efficiency and standby power compliance. |
| Television Power Boards | Monitor Backlight Drivers |
Use Scenario: Protection of main 12 V/24 V logic and audio rails against ESD from HDMI/USB ports and internal switching noise. IC Role / Device Role / Timing Role: Localized TVS mounted near SoC power inputs and audio amplifier supplies. Use Value: Sub-1 ps response ensures clamping occurs before sensitive analog front-ends or video DACs experience latch-up. | Use Scenario: Surge suppression on CCFL or LED backlight boost converter outputs exposed to open-circuit transients during dimming transitions. IC Role / Device Role / Timing Role: Output-side unidirectional clamp absorbing inductive kickback from boost inductors. Use Value: 27.7 V clamping voltage aligns with typical LED string forward voltage margins, avoiding false overvoltage shutdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20A (Bourns) | Identical DO-214AA package, same VWM/VBR/VC specs, but rated for 600 W with tighter VBR tolerance (±5% vs ±5.3% for P6SMB20A) | No functional difference in SMPS or adapter use; identical ISO 7637-2 compliance | Select SMBJ20A if tighter VBR consistency across production lots is required. |
| 1.5SMC20A (ON Semiconductor) | Same electrical ratings and DO-214AB (SMC) package - 2.5 mm wider body than DO-214AA, requiring PCB layout change | Higher thermal mass supports marginally better surge repetition rate, but incompatible footprint | Choose 1.5SMC20A only if board redesign is acceptable and higher IFSM (200 A vs 100 A) is needed. |
Compared with SMBJ20A and 1.5SMC20A, the P6SMB20A offers identical transient suppression performance in the industry-standard DO-214AA footprint, with verified RoHS and halogen-free compliance, making it optimal for cost-sensitive, space-constrained consumer power designs where layout reuse is critical.
Availability
P6SMB20A is available at Aetrix Electronics and suitable for switching mode power supplies, AC-DC adapters, and television power boards requiring stable component supply, automotive-grade surge immunity, and RoHS-compliant manufacturing.
Supply support for P6SMB20A 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, including TVS diodes, rectifiers, and MOSFETs, with global distribution and AEC-Q200 qualified product lines.
The P6SMB20A belongs to TSC's P6SMB series of 600 W surface-mount TVS diodes, engineered for robust transient suppression in automotive, industrial, and consumer power systems where compact size and ISO 7637-2 compliance are mandatory.
FAQ
What is the maximum clamping voltage of the P6SMB20A under a 10/1000 μs surge?
The P6SMB20A has a maximum clamping voltage (VC) of 27.7 V when subjected to a 10/1000 μs waveform at its rated peak pulse current of 22 A. This value is measured per ANSI/IEEE C62.35 and ensures downstream components see limited overvoltage stress during transient events. The P6SMB20A maintains this clamping performance across its full operating temperature range.
Is the P6SMB20A suitable for bidirectional transient protection?
No, the P6SMB20A is a unidirectional TVS diode intended for DC line protection with defined anode-cathode polarity. For bidirectional applications, the P6SMB20CA variant must be used. The P6SMB20A's electrical specifications apply only in the reverse direction; forward conduction follows standard silicon diode behavior with VF ≈ 3.5 V at 50 A.
What is the reverse leakage current specification for the P6SMB20A at its standoff voltage?
The P6SMB20A exhibits a maximum reverse leakage current (IR) of 1 μA when biased at its standoff voltage (VWM) of 17.1 V and tested at 25 °C. This ultra-low leakage minimizes quiescent power loss in battery-backed or energy-efficient systems and remains within specification up to +125 °C ambient.
Does the P6SMB20A meet automotive surge immunity standards?
Yes, the P6SMB20A is explicitly rated to meet ISO 7637-2 for automotive transient immunity, covering Pulse 1 (inductive switch-off), Pulse 2a/2b (load dump and supply interruption), and Pulse 3a/3b (capacitive coupling and board-level noise). Its 600 W peak power rating and sub-1 ps response time satisfy these test conditions without derating.
What is the thermal resistance from junction to ambient for the P6SMB20A in standard FR-4 PCB mounting?
The P6SMB20A has a junction-to-ambient thermal resistance (RθJA) of 55 °C/W when mounted on a standard FR-4 PCB with minimum copper pad area, as defined in the DO-214AA package specification. This value assumes natural convection cooling; adding thermal relief or copper pour reduces effective RθJA and improves sustained surge handling capability.
P6SMB20A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- P6SMB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 17.1V
- Voltage - Breakdown (Min):
- 19V
- Voltage - Clamping (Max) @ Ipp:
- 27.7V
- Current - Peak Pulse (10/1000µs):
- 22A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
P6SMB20A FAQ
1.How can I place an order for P6SMB20A through Aetrix?
Please submit a Request for Quotation (RFQ) for P6SMB20A 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 P6SMB20A reliable?
The price and inventory of P6SMB20A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P6SMB20A is usually 5 days.
3.What payment methods are accepted for P6SMB20A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P6SMB20A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P6SMB20A?
P6SMB20A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P6SMB20A 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 P6SMB20A?
For technical support, including P6SMB20A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P6SMB20A requirements.
6.How does Aetrix verify that P6SMB20A is sourced from the original manufacturer or authorized distributors?
All P6SMB20A 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 P6SMB20A meets industry standards.
7.What is the process for return or replacement of P6SMB20A?
All P6SMB20A units undergo pre-shipment inspection (PSI). If there is an issue with P6SMB20A, 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 P6SMB20A part is unused and in its original packaging.
Return procedure for P6SMB20A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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