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Taiwan Semiconductor Corporation P4SMA6.8C
- Part No.:
- P4SMA6.8C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA6.8C.pdf
- Description:
- 400W, 6.8V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:3,157
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Product details
Overview
P4SMA6.8C from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for clamping fast transients in DC power lines. It features a 6.12–7.48 V breakdown voltage (VBR), 5.5 V working stand-off voltage (VWM), 10.8 V maximum clamping voltage (VC) at 38 A peak pulse current, and 400 W peak pulse power rating under 10/1000 µs waveform - ideal for protecting SMPS inputs and DC/DC converter rails.
For engineers reviewing the P4SMA6.8C datasheet, P4SMA6.8C pinout, P4SMA6.8C application, or P4SMA6.8C equivalent, key selection criteria include its bidirectional-capable marking (C suffix), sub-1 ps response time, <1 µA leakage above 10 V, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, and UL 94V-0 molding compound - all critical for automotive-grade board-level surge protection.
Technical Context
The P4SMA6.8C implements a glass-passivated silicon junction optimized for low-clamping, high-reliability transient suppression in unidirectional configurations. Its electrical behavior follows ANSI/IEEE C62.35 standards, with breakdown measured after 300 µs square-wave IT pulse and clamping defined per 10/1000 µs R.E.A. waveform.
It operates across –55 °C to +150 °C junction temperature range, supports 40 A non-repetitive forward surge (8.3 ms half-sine), and maintains <1 µA reverse leakage at VWM, enabling stable operation in low-power standby circuits without compromising system quiescent current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR @ IT=10 mA | 6.12–7.48 V - ensures reliable turn-on before downstream IC damage threshold |
| VWM | 5.5 V - compatible with 5 V logic rails and USB-powered systems |
| VC @ IPPM=38 A | 10.8 V - limits voltage seen by protected ICs during 400 W surge |
| IR @ VWM | <1000 µA - negligible leakage in always-on monitoring circuits |
| PPPM | 400 W - handles automotive load-dump and inductive switching events |
| Response time | <1.0 ps - faster than most ESD diodes, effective against nanosecond transients |
| TJ max | +150 °C - supports under-hood and industrial ambient environments |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, single-diode configuration with cathode band marking. Matte tin-plated leads meet J-STD-002 solderability; moisture sensitivity level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input side of protected line | Connected to source (e.g., DC input rail); conducts during reverse-biased surge |
| Cathode | Clamp reference / ground return | Connected to system ground or low-impedance return path; defines polarity and clamping direction |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Enables stable VBR over lifetime and improved humidity resistance vs. epoxy-passivated alternatives |
| ISO 7637-2 compliance | Validated for automotive Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnect), and Pulse 3a/3b (switching noise) |
| UL 94V-0 molding compound | Prevents flame propagation in enclosed power supplies and lighting modules |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for green manufacturing |
Applications
| Switching Mode Power Supply (SMPS) | Automotive On-Board DC/DC Converter |
|---|---|
Use Scenario: Input stage protection against line surges and hot-swap transients in AC/DC adapters and open-frame PSUs. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between rectified input and bulk capacitor. Use Value: Limits transient voltage to ≤10.8 V during 400 W pulses, preventing MOSFET gate oxide failure and controller latch-up. | Use Scenario: Protection of 12 V-to-3.3 V/5 V buck converters in vehicle infotainment and ADAS ECUs. IC Role / Device Role / Timing Role: Primary surge shunt on the 12 V input rail upstream of the DC/DC controller. Use Value: Withstands ISO 7637-2 Pulse 1 (–100 V, 50 Ω, 2 Ω series) without degradation, ensuring functional safety compliance. |
| LED Lighting Driver | Industrial PLC I/O Module |
Use Scenario: Surge protection on constant-current LED driver inputs exposed to mains-coupled transients. IC Role / Device Role / Timing Role: Standoff-rated TVS across input terminals to absorb repetitive line spikes. Use Value: 5.5 V VWM allows compatibility with 5 V control interfaces while clamping to 10.8 V - below typical LED driver IC absolute max ratings. | Use Scenario: Field-side protection on 24 V digital input channels subject to inductive kickback from solenoids and relays. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to common ground, absorbing negative-going transients. Use Value: Sub-1 ps response captures fast edges from relay coil collapse; 400 W rating sustains repeated 24 V/1 A inductive spikes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ6.8A | DO-214AA (SMB) package; 600 W rating; VC = 11.2 V @ 53.3 A | Higher power handling but larger footprint; less suitable for space-constrained SMA layouts | Select when higher surge margin is required and PCB area permits SMB footprint |
| 1.5SMC6.8C | DO-214AB (SMC) package; 1500 W rating; VC = 11.5 V @ 130 A | Designed for heavy-duty industrial transients; incompatible pinout and thermal mass | Choose only for legacy SMC-reflow processes or where >1 kW surge immunity is mandated |
Compared with SMBJ6.8A and 1.5SMC6.8C, the P4SMA6.8C delivers optimal balance of 400 W capability, DO-214AC compactness, and 5.5 V VWM compatibility with 5 V systems - making it preferred for cost-sensitive, high-volume consumer and automotive body electronics.
Availability
P4SMA6.8C is available at Aetrix Electronics and suitable for switching mode power supplies, automotive DC/DC converters, and LED lighting drivers requiring stable component supply with full traceability and lifecycle management.
Supply support for P4SMA6.8C 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 for industrial and automotive markets.
The P4SMA6.8C belongs to TSC's P4SMA series of surface-mount TVS diodes, engineered specifically for high-reliability, automated assembly in automotive and industrial power conversion systems where ISO 7637-2 compliance and UL 94V-0 safety are mandatory.
FAQ
What does the 'C' suffix in P4SMA6.8C indicate?
The 'C' suffix in P4SMA6.8C denotes unidirectional configuration with cathode-band polarity marking. Unlike 'CA' variants (bidirectional), the P4SMA6.8C is intended for DC line protection where transients occur in one polarity only - such as positive-rail clamping in 5 V SMPS inputs. This enables tighter VBR tolerance and lower VC versus bidirectional equivalents.
Is P4SMA6.8C compliant with automotive surge standards?
Yes, P4SMA6.8C meets ISO 7637-2 Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnection), and Pulse 3a/3b (switching noise) requirements. Its 400 W peak pulse power, sub-1 ps response, and 10.8 V clamping voltage at 38 A ensure robust protection for 12 V automotive subsystems - validated per test waveforms defined in the standard.
What is the maximum operating temperature for P4SMA6.8C?
The P4SMA6.8C has a maximum junction temperature (TJ) of +150 °C and operates from –55 °C to +150 °C. This wide range supports deployment in under-hood automotive modules, industrial motor drives, and outdoor LED lighting where ambient temperatures exceed 85 °C - provided PCB copper area and airflow meet TSC's thermal derating guidelines in Figure 2.
Can P4SMA6.8C replace P4SMA6.8A in existing designs?
No - P4SMA6.8C and P4SMA6.8A are not interchangeable. The P4SMA6.8C has VBR = 6.12–7.48 V and VWM = 5.5 V, while P4SMA6.8A specifies VBR = 6.46–7.14 V and VWM = 5.8 V. The higher VWM of P4SMA6.8A provides greater noise margin in 5.5 V systems, whereas P4SMA6.8C offers earlier clamping onset for tighter protection windows.
Does P4SMA6.8C require special PCB layout considerations?
Yes - to preserve its <1 ps response, minimize trace inductance between P4SMA6.8C anode/cathode and protected node/ground. Use short, wide traces (<5 mm), place directly across the protected line, and connect cathode to a low-impedance ground plane. Avoid vias in the current path; follow TSC's suggested pad layout in Package Outline Dimensions (Version S2102, Page 6) for optimal thermal and electrical performance.
P4SMA6.8C Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AC, SMA
- Series:
- P4SMA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 5.5V
- Voltage - Breakdown (Min):
- 6.12V
- Voltage - Clamping (Max) @ Ipp:
- 10.8V
- Current - Peak Pulse (10/1000µs):
- 38A
- Power - Peak Pulse:
- 400W
- 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-214AC (SMA)
P4SMA6.8C FAQ
1.How can I place an order for P4SMA6.8C through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA6.8C 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 P4SMA6.8C reliable?
The price and inventory of P4SMA6.8C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA6.8C is usually 5 days.
3.What payment methods are accepted for P4SMA6.8C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA6.8C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA6.8C?
P4SMA6.8C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA6.8C 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 P4SMA6.8C?
For technical support, including P4SMA6.8C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA6.8C requirements.
6.How does Aetrix verify that P4SMA6.8C is sourced from the original manufacturer or authorized distributors?
All P4SMA6.8C 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 P4SMA6.8C meets industry standards.
7.What is the process for return or replacement of P4SMA6.8C?
All P4SMA6.8C units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA6.8C, 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 P4SMA6.8C part is unused and in its original packaging.
Return procedure for P4SMA6.8C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P4SMA6.8C Tags
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