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Taiwan Semiconductor Corporation P4SMA68CA
- Part No.:
- P4SMA68CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA68CA.pdf
- Description:
- TVS DIODE 58.1VWM 92VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,842
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Product details
Overview
P4SMA68CA from Taiwan Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection in DC power rails and signal lines. It features a 68V working stand-off voltage (VWM), 92.0V maximum clamping voltage (VC) at 4.5A peak impulse current, and 400W peak pulse power rating under 10/1000μs waveform - deployed in switching mode power supplies and on-board DC/DC converters.
For engineers reviewing the P4SMA68CA datasheet, P4SMA68CA pinout, P4SMA68CA application, or P4SMA68CA equivalent, key selection criteria include bidirectional clamping performance, DO-214AC (SMA) package compatibility with automated SMT assembly, low leakage (<1μA at 58.1V), and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive electronics protection.
Technical Context
The P4SMA68CA implements a glass-passivated silicon junction optimized for fast transient suppression, with typical response time under 1.0ps and breakdown voltage range of 64.6–71.4V at 1mA test current. Its bidirectional configuration enables symmetrical clamping in AC-coupled or floating circuits without polarity sensitivity.
Thermal design is supported by a 150°C maximum junction temperature and derating per Fig.2 above 25°C ambient, while mechanical robustness includes UL 94V-0 molding compound, JESD 201 Class 2 whisker resistance, and matte tin-plated leads compliant with J-STD-002 solderability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 58.1 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 64.6 V / 71.4 V at 1mA - Confirmed breakdown threshold range ensuring reliable turn-on margin |
| VC @ IPPM | 92.0 V at 4.5A (10/1000μs) - Clamping voltage limiting protected circuit stress during surge events |
| PPPM | 400 W - Peak pulse power handling capability per single non-repetitive transient |
| IR @ VWM | <1 μA - Negligible leakage current preserving efficiency in high-impedance bias networks |
| Package | DO-214AC (SMA) - Standardized surface-mount outline enabling automated placement and reflow compatibility |
| Polarity | Bidirectional - Cathode band absent; symmetric clamping in both polarities for AC or floating applications |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with two coplanar terminals; cathode marking omitted due to bidirectional construction; weight ≈0.060g; moisture sensitivity level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Both terminals function identically - no polarity dependency; connects across protected line and ground or between differential lines |
| Case | Non-electrical mechanical interface | Insulated plastic body; no thermal or electrical connection to internal die; supports standard SMA footprint pad layout |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable VBR over lifetime and improved humidity resistance vs. epoxy-passivated alternatives |
| ISO 7637-2 compliance | Validated immunity to automotive load dump and switching transients (Pulse 1/2a/2b/3a/3b) |
| Fast response time <1.0ps | Clamps ESD and lightning-induced surges before downstream ICs experience overstress |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU RoHS directives for environmentally constrained designs |
| Automated placement ready | DO-214AC geometry and matte tin plating ensure high-yield pick-and-place and reflow soldering |
Applications
| Switching Mode Power Supply (SMPS) | On-board DC/DC Converter |
|---|---|
Use Scenario: Protection of primary-side MOSFET gate drivers and secondary-side rectifier inputs against flyback spikes and cross-talk. IC Role / Device Role / Timing Role: Bidirectional TVS placed across input bus or output rail to clamp transient excursions exceeding 58.1V. Use Value: Limits voltage overshoot to ≤92.0V during 400W surges, preventing gate oxide rupture and rectifier avalanche failure. | Use Scenario: Safeguarding isolated buck-boost converter feedback paths and enable pins from coupling noise in high-density PCB layouts. IC Role / Device Role / Timing Role: Low-leakage (≤1μA) bidirectional clamp bridging control signal lines referenced to varying potentials. Use Value: Maintains signal integrity without loading sensitive analog nodes, while responding within <1.0ps to fast-rising edge transients. |
| Automotive Lighting Module | Industrial Adapter Input Stage |
Use Scenario: Suppressing load-dump transients (ISO 7637-2 Pulse 5a) on LED driver supply rails in headlamp control units. IC Role / Device Role / Timing Role: Primary overvoltage protection element connected between battery feed and DC/DC input, rated for 150°C operation. Use Value: Withstands 400W pulses without degradation, enabling compliance with automotive OEM surge immunity requirements. | Use Scenario: Guarding universal-input AC/DC adapter outputs against induced surges from shared building wiring or nearby motor switching. IC Role / Device Role / Timing Role: Secondary-side TVS installed across +VOUT/GND to absorb line-to-ground transients before reaching end equipment. Use Value: Clamps 10/1000μs surges to 92.0V at 4.5A, protecting downstream USB-PD controllers and load switches from overvoltage damage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ64CA (Bourns) | 64V VWM, 100V VC @ 4.3A, SMB package (larger footprint) | Higher clamping voltage; requires PCB layout change due to SMB vs. SMA size | Select when higher surge margin is needed and board space allows larger package |
| 1.5KE68CA (ON Semiconductor) | 68V VWM, 112V VC @ 3.6A, DO-201 axial leaded package | Through-hole mounting only; unsuitable for fully SMT designs | Choose only for prototyping or legacy through-hole systems where reflow compatibility is not required |
Compared with SMBJ64CA and 1.5KE68CA, the P4SMA68CA offers tighter clamping (92.0V vs. 100V/112V), smaller DO-214AC footprint, and lower leakage - making it optimal for space-constrained, high-density SMT automotive and industrial power modules requiring precise voltage limiting.
Availability
P4SMA68CA is available at Aetrix Electronics and suitable for switching mode power supplies, automotive lighting modules, and on-board DC/DC converters requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for P4SMA68CA 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 semiconductor manufacturer specializing in discrete power devices, TVS diodes, and rectifiers with global distribution and AEC-Q200 qualified product lines.
The P4SMA68CA belongs to TSC's P4SMAx family of surface-mount TVS diodes engineered for high-reliability transient suppression in automotive, industrial, and consumer power systems - emphasizing fast response, low leakage, and standardized SMT packaging.
FAQ
What is the maximum clamping voltage of the P4SMA68CA under standard surge conditions?
The P4SMA68CA has a maximum clamping voltage (VC) of 92.0 V when subjected to a 10/1000μs waveform with a peak impulse current (IPPM) of 4.5 A. This value is measured per ANSI/IEEE C62.35 and ensures predictable overvoltage limiting during real-world transients such as ISO 7637-2 Pulse 2b. The P4SMA68CA maintains this clamping performance across its specified operating temperature range.
Is the P4SMA68CA unidirectional or bidirectional, and how is polarity indicated?
The P4SMA68CA is a bidirectional TVS diode, as confirmed by the "CA" suffix and explicit documentation stating "electrical characteristics apply in both directions." It lacks a cathode band marking because both terminals are functionally identical - no polarity orientation is required during placement. This makes the P4SMA68CA suitable for AC-coupled lines, floating grounds, or differential signal protection where directionality cannot be assumed.
Does the P4SMA68CA meet automotive surge immunity standards?
Yes, the P4SMA68CA meets ISO 7637-2 for Pulses 1, 2a, 2b, 3a, and 3b - critical for automotive electronic modules exposed to battery line transients. Its 400W peak pulse power rating, 150°C junction temperature limit, and glass-passivated junction support operation in engine bay and lighting control units. The P4SMA68CA is not AEC-Q200 qualified out-of-box but is widely used in automotive-adjacent applications where TSC's qualification data applies.
What is the leakage current specification for the P4SMA68CA at its working voltage?
The P4SMA68CA exhibits a maximum reverse leakage current (IR) of less than 1 μA when biased at its working stand-off voltage (VWM) of 58.1 V. This ultra-low leakage preserves efficiency in high-impedance monitoring circuits and prevents unintended discharge in standby power domains. The specification is guaranteed at TA = 25°C and remains well below 5 μA up to 125°C per thermal derating curves in the P4SMA68CA datasheet.
Can the P4SMA68CA be used in place of the P4SMA68A, and what is the key difference?
No - the P4SMA68CA and P4SMA68A are distinct variants: P4SMA68CA is bidirectional (CA suffix), while P4SMA68A is unidirectional (A suffix) with cathode marking. Their VBR, VWM, and VC values differ slightly (e.g., P4SMA68A has VWM = 55.1 V and VC = 98.0 V). Substituting one for the other risks incorrect clamping behavior in AC or floating circuits. Always verify polarity requirements before selecting between P4SMA68CA and P4SMA68A.
P4SMA68CA 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):
- 58.1V
- Voltage - Breakdown (Min):
- 64.6V
- Voltage - Clamping (Max) @ Ipp:
- 92V
- Current - Peak Pulse (10/1000µs):
- 4.5A
- 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)
P4SMA68CA FAQ
1.How can I place an order for P4SMA68CA through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA68CA 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 P4SMA68CA reliable?
The price and inventory of P4SMA68CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA68CA is usually 5 days.
3.What payment methods are accepted for P4SMA68CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA68CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA68CA?
P4SMA68CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA68CA 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 P4SMA68CA?
For technical support, including P4SMA68CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA68CA requirements.
6.How does Aetrix verify that P4SMA68CA is sourced from the original manufacturer or authorized distributors?
All P4SMA68CA 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 P4SMA68CA meets industry standards.
7.What is the process for return or replacement of P4SMA68CA?
All P4SMA68CA units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA68CA, 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 P4SMA68CA part is unused and in its original packaging.
Return procedure for P4SMA68CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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