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Taiwan Semiconductor Corporation P6SMB18A
- Part No.:
- P6SMB18A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
P6SMB18A.pdf
- Description:
- TVS DIODE 15.3VWM 25.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,301
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Product details
Overview
P6SMB18A from Taiwan Semiconductor is a unidirectional 600W surface-mount transient voltage suppressor (TVS) diode designed for overvoltage protection in DC power lines and signal paths. It features a breakdown voltage range of 17.1–18.9 V at 1.0 mA test current, a maximum clamping voltage of 25.5 V at 25 A peak pulse current, and a standoff voltage of 15.3 V - making it suitable for protecting 15 V rail systems in switching mode power supplies and adapters.
For engineers reviewing the P6SMB18A datasheet, P6SMB18A pinout, P6SMB18A application, or P6SMB18A equivalent, key selection criteria include its DO-214AA (SMB) package compatibility with automated placement, sub-1 μA reverse leakage at 15.3 V, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, and thermal resistance of 55 °C/W (junction-to-ambient).
Technical Context
The P6SMB18A operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to achieve fast response (<1.0 ps from 0 V to VBR(min)) and stable clamping under transient surges. Its single-die configuration and low-profile SMB package support high-density PCB layouts while maintaining robust ESD and surge immunity.
Designed for automotive and industrial environments, it meets JESD201 Class 2 whisker resistance, UL 94V-0 flammability, and RoHS/halogen-free requirements. Thermal performance is characterized by RθJC = 10 °C/W and RθJA = 55 °C/W, enabling reliable operation up to TJ = +150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 17.1 V / 18.9 V at 1.0 mA - defines precise avalanche initiation window for predictable clamping onset |
| VWM | 15.3 V - maximum continuous reverse operating voltage; ensures no conduction during normal 15 V rail operation |
| VC @ IPPM | 25.5 V at 25 A (10/1000 µs) - limits downstream voltage stress during worst-case transients |
| PPPSM | 600 W - peak pulse power handling capacity per ISO 7637-2 Pulse 3b and similar surge waveforms |
| IR @ VWM | <1 µA - negligible standby leakage, critical for low-power and battery-backed circuits |
| TJ(max) | +150 °C - supports operation in under-hood automotive and enclosed industrial enclosures |
| Package | DO-214AA (SMB) - industry-standard surface-mount outline compatible with JEDEC MS-013AC footprint |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with matte tin-plated leads, cathode band marking polarity, weight ≈ 0.090 g, moisture sensitivity level 1 (J-STD-020).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path / surge return node | Connected to system ground or low-impedance return path during transient clamp event |
| Cathode | Protected line input / high-side connection | Connected to the 15 V rail or signal line being protected; marked by band on package |
Key Features
| Feature | Design Value |
|---|---|
| Clamping performance | 25.5 V max at 25 A - holds protected circuit below 26 V during 10/1000 µs surge, preserving 3.3 V/5 V logic integrity |
| Response speed | <1.0 ps - enables suppression before transient energy couples into sensitive ICs |
| Automated assembly support | Low-profile SMB package with J-STD-002 solderable leads - optimized for pick-and-place and reflow compatibility |
| Environmental compliance | RoHS-compliant and halogen-free per IEC 61249-2-21 - meets global regulatory and sustainability requirements |
| Surge standard coverage | ISO 7637-2 Pulse 1, 2a, 2b, 3a, 3b - validated for automotive load dump and inductive switching immunity |
Applications
| Switching Mode Power Supply (SMPS) | AC-DC Adapters |
|---|---|
Use Scenario: Input rectifier output and DC bus lines subject to line-induced surges and load dump events. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed across 15 V output rail to clamp overvoltage transients before they reach regulation ICs or downstream loads. Use Value: Limits voltage excursion to ≤25.5 V during 600 W surges, preventing damage to PWM controllers and MOSFET drivers. | Use Scenario: Secondary-side DC output stage of wall-mounted adapters powering consumer electronics. IC Role / Device Role / Timing Role: Standoff-rated protector on 15 V output, activated only during fault conditions such as capacitor failure or cable short. Use Value: Maintains <1 µA leakage at 15.3 V, avoiding standby power waste while delivering full 600 W surge capability. |
| Flat Panel TV Power Board | Industrial Monitor DC Input |
Use Scenario: 15 V auxiliary supply rail feeding backlight inverters and microcontroller subsystems. IC Role / Device Role / Timing Role: Fast-acting clamping device responding within picoseconds to ESD or board-level coupling events. Use Value: Glass-passivated junction ensures long-term reliability under repeated transient stress in thermally constrained chassis. | Use Scenario: 15 V DC input interface exposed to field wiring transients in factory automation panels. IC Role / Device Role / Timing Role: Primary overvoltage guard on main power entry, coordinated with upstream fusing and filtering. Use Value: DO-214AA footprint allows dense layout without sacrificing 600 W peak power rating or thermal derating margin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18A | Same DO-214AA package, identical VBR (17.1–18.9 V), but rated for 600 W with slightly higher VC = 27.7 V at 21.7 A | Marginally lower peak pulse current rating (21.7 A vs. 25 A); same ISO 7637-2 compliance | Select SMBJ18A if sourcing flexibility is prioritized and 2.2 V higher clamping voltage is acceptable in system margin analysis. |
| 1.5SMC18A | Higher power rating (1500 W), larger DO-214AB (SMC) package, VBR = 17.1–18.9 V, VC = 27.7 V at 54.3 A | Requires PCB redesign due to larger footprint and higher thermal mass; suited for higher-energy surge environments | Choose 1.5SMC18A only when system-level testing confirms need for >600 W surge handling and layout permits SMC footprint. |
Compared with SMBJ18A and 1.5SMC18A, the P6SMB18A delivers optimal balance of compact SMB packaging, precise 15.3 V standoff, and 25.5 V clamping - ideal for space-constrained 15 V rail protection where layout reuse and thermal efficiency are critical.
Availability
P6SMB18A is available at Aetrix Electronics and suitable for switching mode power supplies, AC-DC adapters, and flat panel TV power boards requiring stable component supply and consistent surge performance across production batches.
Supply support for P6SMB18A 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, specializing in TVS diodes, rectifiers, MOSFETs, and power management devices.
The P6SMB series belongs to TSC's standardized surface-mount TVS platform engineered for cost-effective, high-volume overvoltage protection in automotive, industrial, and consumer power systems - emphasizing reliability, JEDEC-compliant packaging, and rigorous surge standard validation.
FAQ
What is the maximum clamping voltage of the P6SMB18A under standard surge conditions?
The P6SMB18A has a maximum clamping voltage (VC) of 25.5 V when subjected to a 10/1000 µs waveform peak pulse current of 25 A. This value is measured per ANSI/IEEE C62.35 and represents the upper limit of voltage seen by protected circuitry during a defined transient event - a critical parameter for ensuring downstream ICs remain within absolute maximum ratings. The P6SMB18A consistently achieves this clamping performance across its qualified temperature range.
Is the P6SMB18A suitable for bidirectional transient protection?
No, the P6SMB18A is a unidirectional TVS diode intended for DC line protection with defined anode-cathode polarity. For bidirectional applications, Taiwan Semiconductor offers the P6SMB18CA variant (with "CA" suffix), which provides symmetrical clamping in both directions. Using the P6SMB18A in reverse-biased configurations may result in unintended conduction or failure; always observe the cathode band marking during placement. The P6SMB18A datasheet explicitly specifies unidirectional operation.
What is the standoff voltage rating (VWM) of the P6SMB18A, and why does it matter?
The P6SMB18A has a standoff voltage (VWM) of 15.3 V, meaning it remains non-conductive under continuous reverse bias up to that level. This parameter ensures no leakage current or power loss occurs during normal 15 V rail operation, preserving system efficiency and stability. Exceeding VWM risks premature conduction; therefore, the P6SMB18A is optimally matched to 15 V systems where margin between nominal voltage and breakdown must be tightly controlled - a key design consideration confirmed in the P6SMB18A electrical specifications table.
Does the P6SMB18A meet automotive surge immunity standards?
Yes, the P6SMB18A is specified to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements - the core surge immunity standards for road vehicle electrical systems. Its 600 W peak pulse power rating, fast <1.0 ps response, and validated clamping behavior under these waveforms make it suitable for front-end protection in automotive infotainment power modules, body control units, and display subsystems. Compliance is documented in Taiwan Semiconductor's official P6SMB6.8(A)–P6SMB220(A) datasheet revision Q2209.
What is the thermal resistance profile of the P6SMB18A, and how does it affect PCB layout?
The P6SMB18A has a junction-to-ambient thermal resistance (RθJA) of 55 °C/W and junction-to-case (RθJC) of 10 °C/W, measured in free-air conditions per JEDEC standards. These values indicate moderate self-heating under sustained surge duty cycles; for reliable long-term operation, PCB layout should include ≥25 mm² of copper pour connected to both terminals to improve heat dissipation. The P6SMB18A's DO-214AA package relies on copper area rather than external heatsinking - a design factor explicitly addressed in Taiwan Semiconductor's thermal performance section.
P6SMB18A 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):
- 15.3V
- Voltage - Breakdown (Min):
- 17.1V
- Voltage - Clamping (Max) @ Ipp:
- 25.5V
- Current - Peak Pulse (10/1000µs):
- 25A
- 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)
P6SMB18A FAQ
1.How can I place an order for P6SMB18A through Aetrix?
Please submit a Request for Quotation (RFQ) for P6SMB18A 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 P6SMB18A reliable?
The price and inventory of P6SMB18A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P6SMB18A is usually 5 days.
3.What payment methods are accepted for P6SMB18A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P6SMB18A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P6SMB18A?
P6SMB18A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P6SMB18A 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 P6SMB18A?
For technical support, including P6SMB18A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P6SMB18A requirements.
6.How does Aetrix verify that P6SMB18A is sourced from the original manufacturer or authorized distributors?
All P6SMB18A 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 P6SMB18A meets industry standards.
7.What is the process for return or replacement of P6SMB18A?
All P6SMB18A units undergo pre-shipment inspection (PSI). If there is an issue with P6SMB18A, 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 P6SMB18A part is unused and in its original packaging.
Return procedure for P6SMB18A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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