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Taiwan Semiconductor Corporation P4SMA68C
- Part No.:
- P4SMA68C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA68C.pdf
- Description:
- 400W, 68V, 10%, BIDIRECTIONAL, T
- Quantity:
- Payment:
- Shipping:
Inventory:9,185
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Product details
Overview
P4SMA68C from Taiwan Semiconductor is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, with 61.2–74.8V breakdown voltage (VBR), 55.1V working stand-off voltage (VWM), and 98.0V maximum clamping voltage (VC) at 4.2A peak pulse current - designed for overvoltage protection in DC/DC converters and power adapters.
For engineers reviewing the P4SMA68C datasheet, P4SMA68C pinout, P4SMA68C application, or P4SMA68C equivalent, key selection criteria include clamping performance under 10/1000μs surge, low leakage (<1μA @ VWM), ISO 7637-2 compliance, and thermal stability up to +150°C junction temperature.
Technical Context
The P4SMA68C operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology for stable breakdown behavior and fast response (<1.0ps). Its single-die DO-214AC construction supports automated placement and meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability standards.
It delivers 400W peak pulse power (tp = 1ms) with derating above 25°C ambient, and maintains <1μA reverse leakage at 55.1V - enabling reliable protection in high-impedance input stages of industrial power supplies without loading sensitive control circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR min/max | 61.2V / 74.8V at 1.0mA test current - defines precise avalanche onset window for predictable clamping initiation |
| VWM | 55.1V - maximum continuous reverse voltage before significant leakage, ensuring no false triggering in 48V nominal systems |
| VC @ IPPM | 98.0V at 4.2A (10/1000μs) - limits downstream voltage stress during automotive load dump or inductive switching events |
| IR @ VWM | <1μA - negligible standby current draw, critical for battery-backed or energy-harvesting circuits |
| PPK | 400W peak pulse power - sustains transient energy per ISO 7637-2 Pulse 1/2a/2b/3a/3b without degradation |
| TJ max | +150°C - enables operation in enclosed power enclosures or near heat-generating components |
| Package | DO-214AC (SMA) - industry-standard SMT footprint compatible with reflow and wave soldering per J-STD-002 |
Pinout & Package
DO-214AC (SMA) surface-mount package with cathode band marking; two-terminal unidirectional configuration. Leads are matte tin-plated, solderable per J-STD-002, and polarity is marked on the device body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to system ground or lowest potential node; establishes reference for clamping action |
| Cathode | Protected line input | Connected to line being protected (e.g., DC input rail); conducts avalanche current to anode during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures long-term parameter stability and resistance to humidity-induced drift in harsh environments |
| Fast response time <1.0ps | Clamps transients before sensitive ICs experience overstress - critical for protecting USB-C PD controllers or MCU I/O |
| ISO 7637-2 compliant | Validated for automotive electrical system immunity (Pulse 1/2a/2b/3a/3b), supporting AEC-Q200-aligned designs |
| Moisture sensitivity level 1 | Zero bake requirement prior to reflow; simplifies manufacturing and reduces process risk |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS directives - suitable for green electronics programs |
Applications
| Switching Mode Power Supply (SMPS) | On-board DC/DC Converter |
|---|---|
Use Scenario: Input stage protection against line surges and MOSFET switching spikes in 48V telecom SMPS units. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input rail and ground to clamp transients before they reach primary-side controller ICs. Use Value: Limits peak voltage to 98.0V during 400W surges, preventing damage to 100V-rated MOSFETs and gate drivers in the power stage. | Use Scenario: Protection of 12V-to-3.3V buck converter inputs in industrial PLC modules exposed to field wiring noise. IC Role / Device Role / Timing Role: Standoff-rated TVS absorbing coupled EFT bursts and inductive kickback from nearby relay coils. Use Value: Sub-1μA leakage avoids loading feedback resistors; 55.1V VWM ensures compatibility with 48V backplane inputs while protecting downstream regulators. |
| Lighting Application | Adapters |
Use Scenario: Surge suppression on LED driver input rails in outdoor streetlight systems subject to lightning-induced surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on AC/DC front-end, coordinated with MOVs for multi-stage protection. Use Value: 400W rating handles repetitive 10/1000μs pulses per IEC 61000-4-5; DO-214AC package allows compact layout near input connectors. | Use Scenario: Input protection in universal-input wall adapters (90–264VAC) with active PFC and LLC resonant stages. IC Role / Device Role / Timing Role: Secondary-side TVS safeguarding low-voltage output rails (e.g., 5V/12V) against reverse-energy coupling during fault conditions. Use Value: 98.0V clamping prevents latch-up in USB-PD interface ICs; unidirectional polarity avoids interference with synchronous rectifier control signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ64A | DO-214AA (SMB) package; 64V VBR (min 60.8V), 100V VC @ 3.8A; 600W rating | Higher clamping voltage and larger footprint; better suited for higher-energy surges where board space permits | Select when 600W peak power margin is required and SMB pad layout is available |
| 1.5SMC68C | DO-214AB (SMC) package; 68V VBR (min 64.6V), 105V VC @ 3.8A; 1500W rating | Three times higher power handling but 3× larger footprint; requires PCB real estate and thermal relief design | Choose for severe automotive load-dump scenarios where 1500W capability justifies SMC size penalty |
Compared with SMBJ64A and 1.5SMC68C, the P4SMA68C offers optimal balance of 400W surge capacity, compact DO-214AC footprint, and tight 61.2–74.8V VBR tolerance - making it ideal for space-constrained, cost-sensitive industrial and lighting power supplies requiring ISO 7637-2 compliance.
Availability
P4SMA68C is available at Aetrix Electronics and suitable for switching mode power supplies, on-board DC/DC converters, and lighting applications requiring stable component supply, consistent parametric performance, and full traceability across production lots.
Supply support for P4SMA68C 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 power management, protection, and signal conditioning devices.
The P4SMA68C belongs to TSC's P4SMA series of surface-mount TVS diodes - engineered specifically for robust, automated-manufacturing-ready overvoltage protection in industrial, automotive, and consumer power systems.
FAQ
What is the polarity configuration of the P4SMA68C?
The P4SMA68C is a unidirectional TVS diode, configured with a clearly marked cathode band indicating the protected line terminal. It conducts avalanche current only when the cathode is at a higher potential than the anode - making it suitable for DC rail protection where polarity is fixed and reverse conduction must be blocked.
Does the P4SMA68C meet automotive surge immunity standards?
Yes, the P4SMA68C meets ISO 7637-2 requirements for Pulse 1, 2a, 2b, 3a, and 3b, validating its use in automotive subsystems such as body control modules and infotainment power supplies. Its 400W peak pulse rating and 98.0V clamping voltage align with typical 12V/24V vehicle electrical system transient profiles.
What is the maximum operating junction temperature for the P4SMA68C?
The P4SMA68C has a maximum operating junction temperature (TJ) of +150°C, verified per absolute maximum ratings. This allows reliable operation in thermally demanding environments such as enclosed LED drivers or industrial power supplies where ambient temperatures exceed 85°C.
How does the P4SMA68C compare to bidirectional TVS diodes like P4SMA68CA?
The P4SMA68C is unidirectional and optimized for DC applications with defined polarity, offering lower leakage and tighter VBR tolerance than its bidirectional counterpart P4SMA68CA. The CA version supports AC-coupled or polarity-agnostic protection but exhibits higher capacitance and slightly reduced clamping efficiency due to dual-junction architecture.
Is the P4SMA68C compatible with lead-free reflow soldering processes?
Yes, the P4SMA68C uses matte tin-plated leads qualified per J-STD-002 and is rated for moisture sensitivity level 1 - meaning it can be processed using standard lead-free reflow profiles (e.g., JEDEC J-STD-020) without baking or special handling, supporting high-yield automated assembly.
P4SMA68C 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):
- 55.1V
- Voltage - Breakdown (Min):
- 61.2V
- Voltage - Clamping (Max) @ Ipp:
- 98V
- Current - Peak Pulse (10/1000µs):
- 4.2A
- 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)
P4SMA68C FAQ
1.How can I place an order for P4SMA68C through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA68C 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 P4SMA68C reliable?
The price and inventory of P4SMA68C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA68C is usually 5 days.
3.What payment methods are accepted for P4SMA68C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA68C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA68C?
P4SMA68C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA68C 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 P4SMA68C?
For technical support, including P4SMA68C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA68C requirements.
6.How does Aetrix verify that P4SMA68C is sourced from the original manufacturer or authorized distributors?
All P4SMA68C 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 P4SMA68C meets industry standards.
7.What is the process for return or replacement of P4SMA68C?
All P4SMA68C units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA68C, 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 P4SMA68C part is unused and in its original packaging.
Return procedure for P4SMA68C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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