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Taiwan Semiconductor Corporation P4SMA68H
- Part No.:
- P4SMA68H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA68H.pdf
- Description:
- 400W, 68V, 10%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:6,689
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Product details
Overview
P4SMA68H from Taiwan Semiconductor is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode with a 61.2–74.8V breakdown voltage, 55.1V working stand-off voltage, and 98.0V clamping voltage at 4.2A peak pulse current. It features AEC-Q101 qualification, glass passivated junction, and <1.0ps response time for automotive-grade surge protection in DC/DC converters and power supplies.
For engineers reviewing the P4SMA68H datasheet, P4SMA68H pinout, P4SMA68H application, or P4SMA68H equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, moisture sensitivity level (MSL 1), and DO-214AC (SMA) package compatibility with automated SMT assembly.
Technical Context
The P4SMA68H operates as a unidirectional avalanche diode, designed to clamp transient overvoltages above its VWM (55.1V) by entering avalanche breakdown at VBR (61.2–74.8V). Its fast response (<1.0ps) and low leakage (<1μA at VWM) ensure minimal interference during normal operation while delivering robust protection against ESD and load-dump events.
It meets ISO 7637-2 test requirements for automotive electronics, including Pulse 1 (inductive load disconnect), Pulse 2a (sudden load removal), Pulse 2b (supply interruption), and Pulses 3a/3b (switching transients). The device's DO-214AC (SMA) package supports high thermal dissipation and complies with JESD201 Class 2 whisker resistance and UL 94V-0 flammability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 55.1 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR @ IT=1mA | 61.2–74.8 V - Breakdown voltage range defining reliable avalanche onset threshold |
| VC @ IPPM=4.2A | 98.0 V - Clamped voltage during 10/1000μs surge, limiting downstream stress |
| PPPM | 400 W - Peak pulse power handling per single non-repetitive 10/1000μs waveform |
| IR @ VWM | <1 μA - Ultra-low reverse leakage preserves efficiency in high-impedance circuits |
| TJ max | 150 °C - Maximum junction temperature enabling operation in under-hood automotive environments |
| Package | DO-214AC (SMA) - Standardized surface-mount outline with cathode band marking and MSL 1 rating |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band; weight ≈0.060g; compliant with J-STD-002 solderability and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side of protected circuit; conducts during forward surge (IFSM = 40A) |
| Cathode | Reverse-biased clamping terminal | Connected to higher-potential rail; initiates avalanche clamping when transient exceeds VWM |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics |
| Glass passivated junction | Enhances long-term reliability and stability of VBR under thermal cycling and humidity stress |
| Clamping voltage ≤98.0V at 4.2A | Ensures protected ICs (e.g., 75V-rated MOSFETs or regulators) remain within safe operating area |
| Response time <1.0ps | Engages before most semiconductor damage mechanisms initiate during ESD or fast transients |
| Meets ISO 7637-2 Pulses 1/2a/2b/3a/3b | Provides system-level compliance for 12V and 24V automotive electrical architectures |
Applications
| Automotive Body Control Module (BCM) | Industrial DC/DC Converter Input Stage |
|---|---|
Use Scenario: Protects microcontroller I/O and CAN transceiver power rails from load dump and jump-start transients in BCMs. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and local regulator input to clamp surges before LDO or buck converter. Use Value: Limits peak voltage to 98.0V during ISO 7637-2 Pulse 5a (load dump), preventing latch-up or gate oxide rupture in downstream ICs. | Use Scenario: Shields isolated DC/DC converter primary-side controller from switching noise and line surges in factory automation equipment. IC Role / Device Role / Timing Role: Mounted across input terminals to absorb repetitive 400W transients without degradation. Use Value: Maintains VR <1μA at 55.1V, minimizing standby power loss while delivering full 400W surge capability. |
| LED Driver Power Input | Telecom Power Supply Front-End |
Use Scenario: Safeguards constant-current LED driver ICs from inductive kickback in streetlight and signage systems. IC Role / Device Role / Timing Role: Placed directly at board edge input to divert surge energy before reaching bridge rectifier and bulk capacitor. Use Value: Clamps 10/1000μs transients to ≤98.0V, preserving driver IC lifetime under repeated lightning-induced surges. | Use Scenario: Used in -48V telecom power distribution units to protect hot-swap controllers and monitoring ICs. IC Role / Device Role / Timing Role: Unidirectional suppression on secondary-side 12V/5V rails where reverse polarity is fixed. Use Value: Enables MSL 1 handling and reflow compatibility-critical for high-volume telecom board manufacturing. |
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 VWM; 100V VC @ 3.8A; 600W PPPM | Higher power rating but larger footprint; less suitable for space-constrained automotive modules | Select SMBJ64A only if board layout allows SMB package and >400W headroom is required |
| 1.5SMC68A | DO-214AB (SMC) package; 68V VWM; 104V VC @ 3.8A; 1500W PPPM | Higher surge capacity but significantly larger size and higher leakage (~5μA); not AEC-Q101 qualified | Choose 1.5SMC68A for industrial non-automotive use where PCB area and qualification are not constraints |
Compared with SMBJ64A and 1.5SMC68A, the P4SMA68H offers optimal balance of AEC-Q101 compliance, DO-214AC (SMA) compactness, and precise 55.1V VWM alignment with 60V-class power rails-making it preferred for automotive and space-limited industrial designs requiring MSL 1 and JESD201 Class 2 reliability.
Availability
P4SMA68H is available at Aetrix Electronics and suitable for automotive body electronics, industrial DC/DC converters, LED driver inputs, and telecom power supply front-ends requiring stable component supply and full traceability.
Supply support for P4SMA68H 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 devices for automotive and industrial markets.
The P4SMA68H belongs to TSC's AEC-Q101-qualified P4SMAxH series of unidirectional surface-mount TVS diodes, engineered specifically for ISO 7637-2-compliant surge protection in 12V/24V automotive subsystems and ruggedized industrial power interfaces.
FAQ
What is the maximum clamping voltage of the P4SMA68H under standard test conditions?
The P4SMA68H has a maximum clamping voltage (VC) of 98.0 V when subjected to a 10/1000 μs peak pulse current of 4.2 A. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during transient events-ensuring compatibility with 75V-rated components downstream of the P4SMA68H.
Is the P4SMA68H suitable for automotive applications requiring AEC-Q101 qualification?
Yes, the P4SMA68H is explicitly AEC-Q101 qualified per the manufacturer's documentation and meets all stress tests including temperature cycling, humidity bias, and mechanical shock. Its DO-214AC (SMA) package, MSL 1 rating, and ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance make it suitable for under-hood and cabin automotive modules where reliability under harsh environmental conditions is mandatory.
What is the working stand-off voltage (VWM) of the P4SMA68H, and why is it critical for circuit design?
The P4SMA68H has a working stand-off voltage (VWM) of 55.1 V, which represents the maximum continuous DC or RMS voltage the device can withstand without entering avalanche conduction. This parameter is critical because it must exceed the normal operating voltage of the protected line-e.g., a 48V nominal bus-to prevent false triggering while leaving sufficient margin below VBR (61.2–74.8 V) for reliable clamping onset.
Does the P4SMA68H have polarity markings, and how is it oriented on the PCB?
Yes, the P4SMA68H uses a DO-214AC (SMA) package with a visible cathode band marking on the body. During PCB layout, the cathode (banded end) must be connected to the higher-potential side of the protected line-e.g., the positive input rail-while the anode connects to ground or lower potential. Incorrect orientation will prevent proper clamping and may lead to catastrophic failure under reverse surge.
What packaging and moisture sensitivity level does the P4SMA68H ship in, and how does that affect assembly?
The P4SMA68H ships in 7,500-unit tape-and-reel packaging and carries a moisture sensitivity level (MSL) rating of Level 1 per J-STD-020-meaning it can be stored indefinitely at ≤30°C/85% RH and requires no baking prior to reflow soldering. This simplifies SMT line integration, eliminates floor-life tracking, and supports direct placement into high-speed pick-and-place machines without process deviation.
P4SMA68H 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
P4SMA68H FAQ
1.How can I place an order for P4SMA68H through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA68H 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 P4SMA68H reliable?
The price and inventory of P4SMA68H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA68H is usually 5 days.
3.What payment methods are accepted for P4SMA68H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA68H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA68H?
P4SMA68H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA68H 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 P4SMA68H?
For technical support, including P4SMA68H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA68H requirements.
6.How does Aetrix verify that P4SMA68H is sourced from the original manufacturer or authorized distributors?
All P4SMA68H 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 P4SMA68H meets industry standards.
7.What is the process for return or replacement of P4SMA68H?
All P4SMA68H units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA68H, 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 P4SMA68H part is unused and in its original packaging.
Return procedure for P4SMA68H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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