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Taiwan Semiconductor Corporation P6SMB18CA
- Part No.:
- P6SMB18CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
P6SMB18CA.pdf
- Description:
- TVS DIODE 15.3VWM 25.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,700
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Product details
Overview
P6SMB18CA from Taiwan Semiconductor is a bidirectional 600W surface-mount transient voltage suppressor (TVS) diode designed for overvoltage protection in DC power lines and signal paths. It features a standoff voltage of 15.3V, breakdown voltage range of 17.1–18.9V at 1mA test current, clamping voltage of 25.5V at 25A peak pulse current, and operates across –55°C to +150°C junction temperature. It is used in switching mode power supplies and consumer display interfaces to absorb ESD and surge transients per ISO 7637-2.
For engineers reviewing the P6SMB18CA datasheet, P6SMB18CA pinout, P6SMB18CA application, or P6SMB18CA equivalent, key selection criteria include bidirectional clamping capability, DO-214AA (SMB) package compatibility with automated placement, low leakage (<1µA @ 15.3V), fast sub-1ps response time, and compliance with automotive pulse standards (Pulse 1/2a/2b/3a/3b).
Technical Context
The P6SMB18CA implements a glass-passivated silicon junction optimized for high-energy transient suppression in both polarities. Its bidirectional architecture enables symmetrical clamping without external polarity management, and its 10°C/W junction-to-case thermal resistance supports sustained operation under repetitive surge conditions when mounted on thermally adequate PCB copper.
It meets ISO 7637-2 Pulse 1 (inductive load dump), Pulse 2a (sudden load disconnect), Pulse 2b (alternator field decay), Pulse 3a (capacitive discharge), and Pulse 3b (inductive switch-off), making it suitable for automotive body electronics and industrial power input stages where unidirectional TVS devices would require redundant placement.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Standoff Voltage) | 15.3 V - Maximum continuous reverse voltage before significant leakage; defines operating margin below clamping threshold |
| VBR (Breakdown Voltage) | 17.1–18.9 V @ 1 mA - Confirmed breakdown range ensures reliable turn-on during transients above nominal rail |
| VC @ IPPM | 25.5 V @ 25 A - Clamped voltage during 10/1000 µs surge; limits downstream IC stress to safe levels |
| PPPM | 600 W - Peak pulse power rating for single 10/1000 µs waveform; determines survivability against IEC 61000-4-5 Level 4 surges |
| IR @ VWM | <1 µA - Ultra-low reverse leakage preserves efficiency in battery-powered or high-impedance circuits |
| TJ Range | –55°C to +150°C - Full automotive-grade junction temperature range supports under-hood and industrial ambient use |
| Response Time | <1.0 ps - Sub-picosecond junction response ensures clamping activation before transient energy couples into protected circuitry |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, bi-directional, cathode band not applicable (symmetrical terminals). Matte tin-plated leads, RoHS and halogen-free compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (Symmetrical) | Bidirectional transient conduction path | No polarity marking required; either terminal serves as anode or cathode depending on transient polarity |
| Case (Body) | Thermal and mechanical interface | DO-214AA outline provides 10°C/W RθJC; requires ≥100 mm² 2-oz copper pad for full 600W rating |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure |
| ISO 7637-2 compliance | Validated performance against all five automotive transient pulses (1, 2a, 2b, 3a, 3b) without derating |
| Low-profile SMB package | Enables high-density layout in space-constrained adapters and monitor power boards |
| J-STD-020 Level 1 MSL | Zero bake requirement prior to reflow; compatible with standard SMT assembly lines |
| Halogen-free & RoHS | Meets IEC 61249-2-21 and EU Directive 2011/65/EU for environmentally regulated end equipment |
Applications
| Switching Mode Power Supply (SMPS) | TV Power Input Stage |
|---|---|
Use Scenario: Protection of primary-side rectifier output and secondary-side DC bus against line surges and inductive kickback. IC Role / Device Role: Bidirectional clamping element placed across bulk capacitor or post-rectifier node. Use Value: Limits transient overshoot to ≤25.5V, preventing MOSFET avalanche failure and controller latch-up during EN 61000-4-5 testing. | Use Scenario: Input-stage surge suppression on 12V/24V DC rails feeding main board and backlight inverters. IC Role / Device Role: First-line defense against coupled transients from HDMI/USB hot-plug events and AC/DC adapter instability. Use Value: Withstands 600W pulses while maintaining <1µA leakage at 15.3V, avoiding standby current degradation in energy-efficient designs. |
| Monitor DC Power Interface | Automotive Body Control Module (BCM) |
Use Scenario: Protection of USB-C PD negotiation lines and auxiliary 5V/12V rails in smart monitors. IC Role / Device Role: Low-capacitance TVS placed adjacent to connector pins to shunt ESD before reaching USB PHY or PMIC. Use Value: Sub-1ps response ensures clamping occurs before 8kV HBM ESD pulse propagates; SMB footprint allows direct routing under connector. | Use Scenario: CAN/LIN bus power rail protection and sensor supply line conditioning in door modules and lighting controllers. IC Role / Device Role: Bidirectional clamp on 5V/12V microcontroller supply, co-located with LDO or buck converter input. Use Value: Meets ISO 7637-2 Pulse 2b and 3b requirements without additional RC filtering, reducing BOM count and board area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18CA (Bourns) | Identical DO-214AA package, same 15.3V VWM and 25.5V VC, but rated at 600W with tighter VBR tolerance (17.1–18.2V) | Same ISO 7637-2 compliance; slightly lower max clamping voltage improves margin for 3.3V logic rails | Select SMBJ18CA if tighter VBR distribution is required for production yield control in high-volume automotive programs |
| 1.5SMC18CA (ON Semiconductor) | Same electrical specs and SMB package, but higher RθJA (60°C/W vs. 55°C/W); identical 600W PPPM rating | Requires larger thermal pad for equivalent power handling; otherwise drop-in for non-automotive industrial SMPS | Choose 1.5SMC18CA only when sourcing constraints exist and thermal design accommodates higher ambient rise |
Compared with P6SMB18CA, SMBJ18CA offers tighter VBR control for improved consistency in mass production, while 1.5SMC18CA maintains functional equivalence but demands greater PCB thermal management to sustain full 600W rating.
Availability
P6SMB18CA is available at Aetrix Electronics and suitable for switching mode power supplies, TV power input stages, and monitor DC interface designs requiring stable component supply, automotive-grade surge immunity, and RoHS-compliant manufacturing.
Supply support for P6SMB18CA 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, and power MOSFETs since 1979.
The P6SMB series belongs to TSC's high-reliability surface-mount TVS portfolio, engineered specifically for automotive and industrial applications demanding ISO 7637-2 compliance, extended temperature operation, and automated assembly compatibility.
FAQ
What is the maximum clamping voltage of the P6SMB18CA under a 10/1000 µs surge?
The P6SMB18CA has a maximum clamping voltage (VC) of 25.5 V when subjected to a 10/1000 µs waveform at its rated peak pulse current of 25 A. This value is measured per ANSI/IEEE C62.35 and guarantees that protected downstream circuitry will not experience voltages exceeding 25.5 V during standardized surge events, making the P6SMB18CA suitable for safeguarding 24V systems and logic-level interfaces.
Is the P6SMB18CA unidirectional or bidirectional, and how is polarity identified?
The P6SMB18CA is a bidirectional TVS diode, indicated by the "CA" suffix per TSC's naming convention. It has no cathode band or polarity marking because both terminals function identically-conducting in either direction once the breakdown voltage is exceeded. This eliminates orientation concerns during automated placement and simplifies layout in AC-coupled or floating-rail applications where transient polarity is unpredictable.
Does the P6SMB18CA meet automotive transient immunity standards?
Yes, the P6SMB18CA is explicitly validated to meet ISO 7637-2 for all five defined test pulses: Pulse 1 (inductive load dump), Pulse 2a (sudden load disconnect), Pulse 2b (alternator field decay), Pulse 3a (capacitive discharge), and Pulse 3b (inductive switch-off). This makes the P6SMB18CA appropriate for body electronics, infotainment power rails, and other non-safety-critical automotive subsystems where robust EMC performance is mandatory.
What is the thermal resistance profile of the P6SMB18CA, and how does it affect PCB layout?
The P6SMB18CA has a junction-to-case thermal resistance (RθJC) of 10°C/W and a junction-to-ambient resistance (RθJA) of 55°C/W when mounted on a standard FR-4 board with minimum recommended copper. To sustain its full 600W peak pulse rating, the PCB must provide ≥100 mm² of 2-ounce copper connected directly to both terminals. Insufficient copper area increases junction temperature rise and may cause thermal runaway during repetitive surges, so thermal pad design is critical for the P6SMB18CA.
Can the P6SMB18CA be used in place of a unidirectional TVS like P6SMB18A?
No-the P6SMB18CA and P6SMB18A are electrically distinct: P6SMB18A is unidirectional (anode/cathode asymmetry), while P6SMB18CA is bidirectional (symmetrical conduction). Substituting one for the other without circuit review risks incorrect clamping behavior-e.g., forward conduction during negative transients in a unidirectional layout. The P6SMB18CA must only replace other "CA"-suffixed parts or verified bidirectional equivalents; the P6SMB18CA datasheet specifies no unidirectional operation.
P6SMB18CA 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:
- -
- Bidirectional Channels:
- 1
- 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)
P6SMB18CA FAQ
1.How can I place an order for P6SMB18CA through Aetrix?
Please submit a Request for Quotation (RFQ) for P6SMB18CA 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 P6SMB18CA reliable?
The price and inventory of P6SMB18CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P6SMB18CA is usually 5 days.
3.What payment methods are accepted for P6SMB18CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P6SMB18CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P6SMB18CA?
P6SMB18CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P6SMB18CA 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 P6SMB18CA?
For technical support, including P6SMB18CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P6SMB18CA requirements.
6.How does Aetrix verify that P6SMB18CA is sourced from the original manufacturer or authorized distributors?
All P6SMB18CA 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 P6SMB18CA meets industry standards.
7.What is the process for return or replacement of P6SMB18CA?
All P6SMB18CA units undergo pre-shipment inspection (PSI). If there is an issue with P6SMB18CA, 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 P6SMB18CA part is unused and in its original packaging.
Return procedure for P6SMB18CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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