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Taiwan Semiconductor Corporation P4SMA68
- Part No.:
- P4SMA68
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA68.pdf
- Description:
- 400W, 68V, 10%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:9,161
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Product details
Overview
P4SMA68 from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for primary-side overvoltage protection in DC power rails. It features a 61.2–74.8 V breakdown voltage (VBR), 55.1 V working stand-off voltage (VWM), 98.0 V maximum clamping voltage (VC) at 4.2 A peak pulse current, and 400 W peak pulse power rating under 10/1000 µs waveform - deployed in switching mode power supplies and on-board DC/DC converters.
For engineers reviewing the P4SMA68 datasheet, P4SMA68 pinout, P4SMA68 application, or P4SMA68 equivalent, key selection criteria include clamping performance at rated surge current, leakage current ≤1 µA at VWM, DO-214AC (SMA) package compatibility with automated SMT lines, and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive electronics robustness.
Technical Context
The P4SMA68 operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to achieve fast response (<1.0 ps) and stable breakdown characteristics across -55°C to +150°C junction temperature range. Its single-die DO-214AC construction enables high surge current handling (4.2 A, 10/1000 µs) while maintaining low capacitance and minimal leakage (≤1 µA at 55.1 V).
Electrical behavior follows ANSI/IEEE C62.35 standards, with VBR specified at 1.0 mA test current and temperature coefficient of 0.104 %/°C. The device is not rated for bidirectional use - polarity is marked via cathode band, and reverse standoff must remain below 55.1 V to ensure <1 µA leakage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 61.2 V / 74.8 V at 1.0 mA - defines reliable avalanche initiation window for overvoltage triggering |
| VWM | 55.1 V - maximum continuous reverse voltage before leakage exceeds 1 µA; sets system operating margin |
| VC @ IPPM | 98.0 V at 4.2 A (10/1000 µs) - clamping voltage seen by protected circuit during worst-case surge |
| PPPM | 400 W - peak pulse power dissipation capability; determines survivability against ISO 7637-2 transients |
| IR @ VWM | ≤1 µA - ensures negligible standby power loss and signal integrity in high-impedance monitoring paths |
| Junction Temp Range | -55°C to +150°C - supports operation in under-hood automotive, industrial power, and enclosed SMPS environments |
| Package | DO-214AC (SMA) - industry-standard SMT outline with matte tin-plated leads, J-STD-002 solderable, MSL Level 1 |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, single-ended unidirectional configuration with cathode band marking. Case meets UL 94V-0; weight ≈ 0.060 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-voltage rail; forms current path during reverse-biased clamping event |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., +12 V rail); avalanche conduction occurs when voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures long-term stability of VBR and low parameter drift across thermal cycling and humidity exposure |
| Clamping ratio (VC/VBR) | ~1.38 (98.0 V / 71.0 V typ) - balances protection margin and system voltage tolerance without overdesign |
| Response time | <1.0 ps - enables suppression of ESD and fast-edge transients before downstream ICs experience overstress |
| ISO 7637-2 compliance | Certified for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling) - validated for automotive ECUs |
| Moisture sensitivity | MSL Level 1 - zero bake requirement prior to reflow; compatible with standard SMT assembly processes |
Applications
| Automotive Body Control Module (BCM) | Industrial SMPS Input Stage |
|---|---|
Use Scenario: Protects microcontroller I/O and CAN transceiver power rails from load-dump transients (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role: Primary clamping element placed between fused battery feed and local 12 V distribution node. Use Value: Limits voltage excursion to ≤98.0 V during 12 V system surges, preventing latch-up or gate oxide damage in 3.3 V/5 V logic. |
Use Scenario: Shields PWM controller ICs and gate drivers from reflected switching spikes in AC-DC front-end and DC-DC converter inputs. IC Role / Device Role: Unidirectional TVS mounted directly at DC bus entry point upstream of bulk capacitor. Use Value: Absorbs 400 W transient energy without degradation, maintaining VWM = 55.1 V to avoid false triggering during normal 48 V nominal operation. |
| LED Driver Power Input | Telecom DC Feeder Protection |
Use Scenario: Safeguards constant-current LED driver ICs from inductive kickback during hot-plug events or cable ESD. IC Role / Device Role: Standoff-rated TVS placed between input connector and input filter choke. Use Value: Delivers 98.0 V clamping at 4.2 A while drawing only ≤1 µA at 55.1 V - preserves efficiency in low-power lighting systems. |
Use Scenario: Guards PoE-powered equipment (e.g., IP cameras, access points) against lightning-induced surges on 48 V DC feeder lines. IC Role / Device Role: First-line transient suppressor on DC input before DC-DC isolation stage. Use Value: Withstands repetitive 10/1000 µs surges up to 400 W and meets IEC 61000-4-5 Level 4 immunity requirements when used with series impedance. |
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 (Bourns) | 64 V VWM, 103 V VC @ 3.9 A, DO-214AA (SMB) package - larger footprint, higher clamping voltage | Higher power handling (600 W), but less suitable for space-constrained layouts requiring DO-214AC | Select SMBJ64A only if board area allows SMB package and system can tolerate 103 V clamping. |
| 1.5SMC68A (ON Semiconductor) | 68 V VBR, 55.1 V VWM, 105 V VC @ 3.8 A, DO-214AB (SMC) package - 1.5 kW rating, larger body | Designed for higher-energy transients; requires PCB real estate and thermal relief not needed for P4SMA68's 400 W use case | Choose 1.5SMC68A only when legacy designs mandate SMC footprint or surge energy exceeds 400 W. |
Compared with SMBJ64A and 1.5SMC68A, the P4SMA68 offers optimal balance of compact DO-214AC packaging, precise 55.1 V standoff, and 98.0 V clamping - making it ideal for cost- and space-sensitive 48 V DC systems where 400 W surge immunity suffices.
Availability
P4SMA68 is available at Aetrix Electronics and suitable for automotive body control modules, industrial switching mode power supplies, and LED driver input protection requiring stable component supply, full traceability, and RoHS/halogen-free compliance.
Supply support for P4SMA68 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, rectifiers, and MOSFETs for industrial, automotive, and consumer applications.
The P4SMA68 belongs to TSC's P4SMAx family of 400 W surface-mount TVS diodes, engineered specifically for high-reliability DC rail protection in space-constrained, thermally demanding environments.
FAQ
What is the polarity configuration of the P4SMA68?
The P4SMA68 is a unidirectional TVS diode with clearly marked cathode band. It conducts only when the cathode is biased positively relative to the anode - meaning it protects against positive transients on the cathode-connected line. This configuration ensures low leakage (<1 µA) at its 55.1 V working stand-off voltage and prevents unintended conduction during normal operation. The P4SMA68 must not be used in bidirectional applications unless paired with a complementary device.
Does the P4SMA68 meet automotive transient immunity standards?
Yes, the P4SMA68 meets ISO 7637-2 requirements for Pulse 1 (inductive load dump), Pulse 2a/2b (supply disconnection and switching transients), and Pulse 3a/3b (capacitive coupling). Its 400 W peak pulse power rating and 98.0 V clamping voltage at 4.2 A enable effective suppression of these waveforms when correctly placed on 12 V or 48 V vehicle networks. System-level validation per ISO 16750-2 is still required, but the P4SMA68 satisfies the component-level stress criteria.
What is the maximum ambient temperature for continuous operation of the P4SMA68?
The P4SMA68 has a junction temperature limit of +150°C and is rated for operation from -55°C to +150°C. At 25°C ambient, it delivers full 400 W pulse power; derating begins above 25°C per the manufacturer's pulse derating curve (Fig.2). For continuous DC bias, thermal design must ensure junction temperature stays within limits - typical PCB copper area and airflow determine usable ambient ceiling, but the device itself supports ambient temperatures up to +125°C in well-designed layouts.
How does the P4SMA68 compare to the P4SMA68A variant?
The P4SMA68A offers tighter VBR tolerance (64.6–71.4 V vs. 61.2–74.8 V for P4SMA68) and slightly lower clamping voltage (92.0 V vs. 98.0 V at rated current), due to enhanced process control. Both share identical DO-214AC packaging, 55.1/58.1 V VWM, and 400 W rating. The P4SMA68A is preferred where consistent clamping behavior across production lots is critical; the P4SMA68 remains optimal for cost-sensitive designs accepting wider VBR spread.
Is the P4SMA68 halogen-free and RoHS compliant?
Yes, the P4SMA68 is RoHS compliant and halogen-free per IEC 61249-2-21. Its molding compound contains no brominated flame retardants or chlorine-based additives, and all terminations use matte tin plating meeting J-STD-002 solderability requirements. These attributes support compliance with environmental directives in EU, China, and other regulated markets - documentation is available upon request from Aetrix Electronics.
P4SMA68 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:
- 1
- Bidirectional Channels:
- -
- 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)
P4SMA68 FAQ
1.How can I place an order for P4SMA68 through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA68 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 P4SMA68 reliable?
The price and inventory of P4SMA68 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA68 is usually 5 days.
3.What payment methods are accepted for P4SMA68?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA68 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA68?
P4SMA68 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA68 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 P4SMA68?
For technical support, including P4SMA68 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA68 requirements.
6.How does Aetrix verify that P4SMA68 is sourced from the original manufacturer or authorized distributors?
All P4SMA68 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 P4SMA68 meets industry standards.
7.What is the process for return or replacement of P4SMA68?
All P4SMA68 units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA68, 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 P4SMA68 part is unused and in its original packaging.
Return procedure for P4SMA68:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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