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Taiwan Semiconductor Corporation P4SMA68A
- Part No.:
- P4SMA68A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA68A.pdf
- Description:
- TVS DIODE 58.1VWM 92VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,008
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Product details
Overview
P4SMA68A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection in DC power rails and signal lines. It features a 64.6–71.4 V breakdown voltage (VBR), 58.1 V working stand-off voltage (VWM), 92.0 V clamping voltage (VC) at 4.5 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 P4SMA68A datasheet, P4SMA68A pinout, P4SMA68A application, or P4SMA68A equivalent, key selection criteria include unidirectional polarity, DO-214AC (SMA) package compatibility, sub-1 µA reverse leakage at VWM, <1 ps response time, and ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance for automotive-grade surge immunity.
Technical Context
The P4SMA68A operates as a unidirectional avalanche diode with glass-passivated junction, optimized for fast clamping of transient surges on positive-polarity DC lines. Its electrical behavior follows IEEE C62.35 standards, with breakdown tested using 300 µs square-wave pulses and clamping validated under standardized 10/1000 µs double-exponential waveforms.
Thermal derating begins above 25°C ambient per Fig.2, and maximum junction temperature is rated at 150°C. The device exhibits a +0.104 %/°C temperature coefficient of VBR, ensuring predictable voltage drift across industrial temperature ranges (−55°C to +150°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR @ IT=1mA | 64.6–71.4 V - defines minimum/maximum avalanche onset voltage under standard test conditions |
| VWM | 58.1 V - maximum continuous reverse operating voltage before significant leakage |
| VC @ IPPM=4.5A | 92.0 V - clamped voltage during 10/1000 µs surge, limiting downstream stress |
| IR @ VWM | <1 µA - ensures minimal standby power loss and signal integrity in high-impedance circuits |
| PPPM | 400 W - peak pulse power handling capability under standardized surge waveform |
| Package | DO-214AC (SMA) - industry-standard surface-mount outline with cathode band marking |
| Response Time | <1.0 ps - enables suppression of ESD and fast transients before IC damage occurs |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band; weight ≈ 0.060 g; meets UL 94V-0 and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., GND or return path) in unidirectional configuration |
| Cathode (marked) | Avalanche clamping terminal | Connected to protected line (e.g., +VIN); conducts when transient exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable VBR and long-term reliability under thermal cycling and humidity exposure |
| ISO 7637-2 compliance | Validated for automotive load-dump and inductive-switching transients (Pulse 1/2a/2b/3a/3b) |
| Moisture sensitivity level 1 | Enables standard SMT reflow without baking or special handling per J-STD-020 |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU RoHS Directive for environmentally compliant manufacturing |
| Fast response & low clamping | <1 ps turn-on and 92.0 V clamping at 4.5 A enable protection of 65 nm–28 nm logic and analog ICs |
Applications
| Switching Mode Power Supply (SMPS) | On-Board DC/DC Converter |
|---|---|
Use Scenario: Protection of primary-side MOSFET gate drivers and secondary-side rectifier outputs against flyback spikes and cross-talk. IC Role / Device Role / Timing Role: Unidirectional TVS placed across input/output rails to clamp transients before they reach PWM controllers or synchronous rectifiers. Use Value: Limits VC to 92.0 V while absorbing 400 W surges, preventing latch-up or gate oxide rupture in 650 V Si MOSFETs and GaN drivers. | Use Scenario: Input rail protection in point-of-load (POL) converters powering FPGAs, ASICs, or DDR memory subsystems. IC Role / Device Role / Timing Role: Standoff-rated TVS on 12 V or 48 V input bus to suppress coupling from adjacent switching stages or hot-swap events. Use Value: Sub-1 µA leakage at 58.1 V VWM avoids loading sensitive feedback networks; 92.0 V clamping preserves 100 V-rated input capacitors. |
| Automotive Body Control Module (BCM) | Industrial LED Driver |
Use Scenario: Load-dump and jump-start surge suppression on 12 V battery-fed microcontroller power domains. IC Role / Device Role / Timing Role: Primary-line TVS on MCU VDD supply, positioned upstream of LDOs and reset supervisors. Use Value: ISO 7637-2 Pulse 5a (load dump) compliance ensures survival of 35 V/100 ms transients without degradation or parametric shift. | Use Scenario: Overvoltage protection on constant-current LED string inputs exposed to inductive kickback from driver MOSFETs. IC Role / Device Role / Timing Role: Clamp diode across LED+ and LED− terminals to absorb reverse-recovery energy and prevent LED open-circuit failure. Use Value: 92.0 V clamping prevents exceedance of typical 100 V LED string breakdown ratings; DO-214AC footprint allows compact placement near driver IC. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ64A (Bourns) | Same DO-214AA (SMB) package; 64 V VWM, 103 V VC @ 3.9 A, 600 W PPPM | Higher clamping voltage and larger footprint; better suited for higher-energy surges | Select when system-level testing requires >400 W margin or PCB layout accommodates SMB outline |
| 1.5SMC68A (ON Semiconductor) | DO-214AB (SMC) package; 68 V VWM, 105 V VC @ 3.8 A, 1500 W PPPM | Higher power rating but 3× larger footprint; not drop-in compatible | Choose only if legacy board space allows SMC and surge requirements exceed 400 W |
Compared with SMBJ64A and 1.5SMC68A, the P4SMA68A offers tighter VBR tolerance (±5%), lower clamping (92.0 V vs. ≥103 V), and DO-214AC footprint - making it optimal for space-constrained 12–48 V DC systems requiring precise voltage limiting and ISO 7637-2 compliance.
Availability
P4SMA68A is available at Aetrix Electronics and suitable for switching mode power supplies, on-board DC/DC converters, and automotive body control modules requiring stable component supply and full traceability.
Supply support for P4SMA68A 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 and automotive markets.
The P4SMA series belongs to TSC's surface-mount TVS portfolio engineered for high-reliability transient suppression in harsh environments - emphasizing low leakage, tight VBR distribution, and AEC-Q200-aligned robustness.
FAQ
What is the polarity configuration of the P4SMA68A?
The P4SMA68A is a unidirectional TVS diode, with cathode marked by a band on the DO-214AC (SMA) package. It conducts only when the cathode is at higher potential than the anode - ideal for protecting positive DC rails. Bidirectional variants use "C" or "CA" suffixes (e.g., P4SMA68CA), which are not interchangeable with the P4SMA68A.
Does the P4SMA68A meet automotive surge immunity standards?
Yes, the P4SMA68A meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements for transient immunity in 12 V automotive systems. Its 92.0 V clamping voltage and 400 W peak pulse rating ensure protection against load dump, inductive switching, and supply reversal events - confirmed in TSC's official characterization data.
What is the maximum junction temperature rating for the P4SMA68A?
The P4SMA68A has a maximum junction temperature (TJMAX) of +150°C and an operating junction temperature range of −55°C to +150°C. Derating of peak pulse power begins above 25°C ambient per Figure 2 in the datasheet, with 50% power capability retained at +100°C ambient.
How does the P4SMA68A compare to the P4SMA68 (non-A) variant?
The P4SMA68A has tighter breakdown voltage tolerance (64.6–71.4 V, ±5%) versus P4SMA68 (61.2–74.8 V, ±10%). It also features lower clamping voltage (92.0 V vs. 98.0 V), higher VWM (58.1 V vs. 55.1 V), and identical 400 W rating. These improvements make P4SMA68A preferable for precision-sensitive designs where consistent clamping and reduced leakage are critical.
Is the P4SMA68A RoHS and halogen-free compliant?
Yes, the P4SMA68A is RoHS compliant and halogen-free per IEC 61249-2-21. Its molding compound meets UL 94V-0 flammability rating, and matte tin-plated leads comply with J-STD-002 solderability requirements - verified in TSC's S2102 revision documentation.
P4SMA68A 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):
- 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)
P4SMA68A FAQ
1.How can I place an order for P4SMA68A through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA68A 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 P4SMA68A reliable?
The price and inventory of P4SMA68A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA68A is usually 5 days.
3.What payment methods are accepted for P4SMA68A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA68A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA68A?
P4SMA68A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA68A 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 P4SMA68A?
For technical support, including P4SMA68A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA68A requirements.
6.How does Aetrix verify that P4SMA68A is sourced from the original manufacturer or authorized distributors?
All P4SMA68A 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 P4SMA68A meets industry standards.
7.What is the process for return or replacement of P4SMA68A?
All P4SMA68A units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA68A, 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 P4SMA68A part is unused and in its original packaging.
Return procedure for P4SMA68A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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