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Taiwan Semiconductor Corporation P6SMB18CH
- Part No.:
- P6SMB18CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
P6SMB18CH.pdf
- Description:
- 600W, 18V, 10%, BIDIRECTIONAL, T
- Quantity:
- Payment:
- Shipping:
Inventory:4,077
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Product details
Overview
P6SMB18CH from Taiwan Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in DO-214AA (SMB) package, rated for 600W peak pulse power, 18V breakdown voltage (VBR min/max = 16.2–19.8V), and 26.5V maximum clamping voltage (VC) at 23A peak pulse current - designed for automotive-grade ESD and load-dump protection in power supply rails and signal lines.
For engineers reviewing the P6SMB18CH datasheet, P6SMB18CH pinout, P6SMB18CH application, or P6SMB18CH equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, low leakage (<1 µA @ 14.5V), and thermal resistance (RθJA = 55°C/W) for high-reliability embedded systems.
Technical Context
The P6SMB18CH implements a glass-passivated silicon junction optimized for fast transient suppression with sub-1 ps response time from 0 V to VBR min. Its bidirectional configuration enables symmetrical clamping in AC-coupled or floating circuits without polarity constraints.
It operates across –55°C to +150°C junction temperature range, supports 100 A non-repetitive forward surge (IFSM), and maintains stable VBR temperature coefficient of 0.088%/°C - critical for robustness in automotive under-hood environments where thermal cycling and voltage transients coexist.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 16.2 V / 19.8 V - defines guaranteed breakdown initiation window under 1.0 mA test current; ensures predictable clamping onset across production lot and temperature |
| VWM | 14.5 V - maximum continuous reverse working voltage; sets safe operating margin below breakdown for steady-state biasing |
| VC @ IPPM | 26.5 V @ 23 A - clamped voltage during 10/1000 µs surge; determines protected circuit's maximum transient overvoltage exposure |
| PPPSM | 600 W - peak pulse power rating per 10/1000 µs waveform; quantifies single-event energy absorption capacity |
| IR @ VWM | <1 µA - ultra-low reverse leakage at stand-off voltage; minimizes standby power loss and avoids false triggering in high-impedance nodes |
| TJ max | +150 °C - maximum junction temperature; enables operation in under-hood automotive locations without derating at full power |
| RθJA | 55 °C/W - junction-to-ambient thermal resistance; informs PCB copper area requirements for thermal management in sealed enclosures |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, low-profile, matte tin-plated leads, polarity indicated by cathode band (bidirectional operation uses symmetric marking; no functional anode/cathode distinction).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional transient conduction path | Either terminal serves as clamping node; no polarity dependency - simplifies layout in AC or floating signal paths |
| Case / Body | Thermal and mechanical interface | DO-214AA body provides 0.090 g mass and UL 94V-0 flammability rating; requires minimum 1.5 mm creepage clearance per IEC 61000-4-5 |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including temperature cycling, humidity, and mechanical shock - eliminates need for additional qualification testing |
| Glass passivated junction | Enhances long-term reliability and moisture resistance vs. epoxy-passivated alternatives; meets J-STD-020 MSL Level 1 |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Guarantees immunity to real-world automotive transients including battery disconnect spikes and inductive load switching noise |
| Fast response time <1.0 ps | Clamps before sensitive downstream ICs experience damaging overvoltage - critical for protecting CAN, LIN, and sensor interfaces |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS directives; supports green manufacturing and end-of-life recycling requirements |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: 12 V battery rail in engine control unit exposed to load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional TVS clamping device placed upstream of DC-DC converter input. Use Value: Limits transient voltage to ≤26.5 V during 600 W surges, preventing MOSFET gate oxide failure and regulator latch-up. | Use Scenario: RS-485 bus lines in factory automation PLCs subjected to ESD (IEC 61000-4-2 ±8 kV) and EFT (IEC 61000-4-4 ±2 kV). IC Role / Device Role / Timing Role: Line-side transient suppressor on differential pair, referenced to local ground. Use Value: Clamps common-mode surges within 1 ps while maintaining <1 µA leakage - preserves signal integrity and bias stability. |
| LED Driver Output Protection | Automotive Lighting Module |
Use Scenario: Constant-current LED driver output driving high-brightness headlamp arrays with inductive cable harnesses. IC Role / Device Role / Timing Role: Output-stage TVS absorbing inductive kickback during PWM dimming transitions. Use Value: Absorbs 23 A peak pulses without degradation, enabling >100,000 hot-swap cycles per AEC-Q101 lifetime spec. | Use Scenario: Interior ambient lighting module powered from vehicle CAN bus with shared ground return. IC Role / Device Role / Timing Role: Bidirectional clamp on 5 V logic supply line feeding microcontroller and RGB LED drivers. Use Value: Prevents latch-up in 3.3 V I/O peripherals during conducted transients from adjacent motor drivers - validated per ISO 11452-4. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18CA | Same DO-214AA package, identical VBR (16.2–19.8 V), but lower PPPSM = 600 W (same rating); slightly higher VC = 28.8 V @ 20.9 A | Marginally reduced clamping performance; suitable where 2.3 V higher VC is acceptable for cost-sensitive industrial designs | Select SMBJ18CA only if board-level validation confirms 28.8 V clamping remains within protected IC's absolute max rating. |
| 1.5KE18CA | Through-hole DO-15 package, same VBR/VC, PPPSM = 1500 W - higher power but incompatible footprint and thermal profile | Requires PCB redesign; suited for prototyping or legacy through-hole systems needing higher surge margin | Choose 1.5KE18CA only when P6SMB18CH's 600 W is insufficient and SMT-to-through-hole conversion is feasible. |
Compared with SMBJ18CA and 1.5KE18CA, the P6SMB18CH delivers identical automotive-grade reliability and bidirectional clamping in a space-constrained SMB package, with optimal thermal resistance (55°C/W) for reflow-soldered automotive modules - making it the preferred choice for new SMT-based designs requiring AEC-Q101 compliance.
Availability
P6SMB18CH is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, LED driver outputs, and interior lighting modules requiring stable component supply with full traceability and lifecycle support.
Supply support for P6SMB18CH 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 automotive-qualified components since 1979.
The P6SMB series belongs to TSC's AEC-Q101-qualified transient suppression portfolio, engineered specifically for automotive powertrain, body electronics, and ADAS subsystems where robustness against load dump, ESD, and EFT is mandatory.
FAQ
What does the 'CH' suffix indicate in P6SMB18CH?
The 'CH' suffix in P6SMB18CH denotes a bidirectional configuration with cathode-band marking - confirming symmetrical clamping behavior in both polarities. This distinguishes it from unidirectional variants (e.g., P6SMB18H) and ensures compatibility with AC-coupled or floating signal paths without polarity concerns during placement.
Is P6SMB18CH compliant with AEC-Q101 and ISO 7637-2?
Yes, P6SMB18CH is explicitly AEC-Q101 qualified and meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements per the official Taiwan Semiconductor datasheet (Version A2102). These certifications validate its suitability for automotive power and signal line protection without additional qualification effort.
What is the maximum clamping voltage of P6SMB18CH and at what current is it specified?
The maximum clamping voltage (VC) of P6SMB18CH is 26.5 V, measured at 23 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value defines the upper voltage limit imposed on protected circuitry during worst-case transients and must be compared directly against downstream IC absolute maximum ratings.
Can P6SMB18CH replace P6SMB18AH in a design?
No - P6SMB18CH and P6SMB18AH are not interchangeable. P6SMB18CH is bidirectional (CH suffix), while P6SMB18AH is unidirectional with tighter VBR tolerance (17.1–18.9 V vs. 16.2–19.8 V) and different marking code (LEJ). Substituting without verifying polarity, clamping symmetry, and leakage behavior risks circuit malfunction or overstress.
What is the thermal resistance and junction temperature rating of P6SMB18CH?
P6SMB18CH has a junction-to-ambient thermal resistance (RθJA) of 55°C/W and a maximum junction temperature (TJ) of +150°C. These values enable reliable operation in sealed automotive enclosures up to +105°C ambient when mounted on ≥1 cm² of 2-oz copper, with no derating required below 25°C ambient.
P6SMB18CH 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):
- 14.5V
- Voltage - Breakdown (Min):
- 16.2V
- Voltage - Clamping (Max) @ Ipp:
- 26.5V
- Current - Peak Pulse (10/1000µs):
- 23A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
P6SMB18CH FAQ
1.How can I place an order for P6SMB18CH through Aetrix?
Please submit a Request for Quotation (RFQ) for P6SMB18CH 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 P6SMB18CH reliable?
The price and inventory of P6SMB18CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P6SMB18CH is usually 5 days.
3.What payment methods are accepted for P6SMB18CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P6SMB18CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P6SMB18CH?
P6SMB18CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P6SMB18CH 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 P6SMB18CH?
For technical support, including P6SMB18CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P6SMB18CH requirements.
6.How does Aetrix verify that P6SMB18CH is sourced from the original manufacturer or authorized distributors?
All P6SMB18CH 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 P6SMB18CH meets industry standards.
7.What is the process for return or replacement of P6SMB18CH?
All P6SMB18CH units undergo pre-shipment inspection (PSI). If there is an issue with P6SMB18CH, 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 P6SMB18CH part is unused and in its original packaging.
Return procedure for P6SMB18CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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