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Vishay General Semiconductor - Diodes Division P4SMA68AHM3_A/I
- Part No.:
- P4SMA68AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA68AHM3_A/I.pdf
- Description:
- TVS DIODE 58.1VWM 92VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,293
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Product details
Overview
P4SMA68AHM3_A/I from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal lines. It features 68 V breakdown voltage (VBR = 64.6–71.4 V at 1 mA), 58.1 V standoff voltage (VWM), 92.0 V maximum clamping voltage (VC) at 4.3 A peak pulse current, and 400 W peak pulse power rating with 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial power supplies.
For engineers reviewing the P4SMA68AHM3_A/I datasheet, P4SMA68AHM3_A/I pinout, P4SMA68AHM3_A/I application, or P4SMA68AHM3_A/I equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (RθJA = 120 °C/W), polarity marking convention, and real-world protection use cases - all confirmed from Vishay's official P4SMA series documentation (Doc. #88367, Rev. 09-Jan-2024).
Technical Context
The P4SMA68AHM3_A/I operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology for stable reverse breakdown and fast response (<1 ns) to ESD and surge events. Its clamping action begins at VWM = 58.1 V and fully engages at VC = 92.0 V under 4.3 A IPPM, limiting transient energy delivered to downstream circuitry.
It is rated for 40 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine), supports continuous power dissipation of 3.3 W at 50 °C ambient, and maintains operation across -65 °C to +150 °C junction temperature range. The device meets MSL Level 1 per J-STD-020 and is halogen-free, RoHS-compliant, and AEC-Q101 qualified (HM3 suffix).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 64.6 V / 71.4 V at 1 mA - defines precise avalanche onset window for reliable overvoltage triggering |
| VWM | 58.1 V - maximum continuous reverse operating voltage before leakage exceeds 1 µA |
| VC @ IPPM | 92.0 V at 4.3 A - clamping voltage during 10/1000 µs surge, directly limiting stress on protected ICs |
| PPPM | 400 W - peak pulse power handling capability under standard lightning/surge waveform |
| RθJA | 120 °C/W - thermal resistance from junction to ambient, critical for derating in enclosed PCB layouts |
| IFSM | 40 A - single half-sine surge current rating (8.3 ms), supporting inrush and load-dump immunity |
| TJ max | +150 °C - maximum junction temperature enabling use in under-hood automotive environments |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile plastic case with matte tin-plated leads solderable per J-STD-002. Cathode indicated by band; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when VLINE exceeds VWM |
| Anode (unbanded end) | Reference node | Typically tied to system ground or lower-potential rail; completes clamping path during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness |
| Halogen-free & RoHS-compliant | Meets environmental compliance requirements for modern industrial and automotive PCB assemblies |
| 400 W peak pulse power (10/1000 µs) | Provides robust protection against IEC 61000-4-5 Level 4 surges without external heatsinking |
| Low incremental surge resistance | Minimizes VC overshoot during fast transients, improving protection margin for 3.3 V/5 V logic |
| MSL Level 1 moisture sensitivity | Enables direct placement without baking, reducing manufacturing overhead in high-volume SMT lines |
Applications
| Automotive Power Supply Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V power rails in engine control units (ECUs) and body electronics against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery input and DC-DC converter input stage. Use Value: Clamps transients to ≤92.0 V, preventing damage to upstream regulators and ensuring uninterrupted MCU operation during cranking events. |
Use Scenario: Safeguarding analog outputs and digital communication lines (e.g., LIN, CAN PHY power) of pressure/temperature sensors in factory automation systems. IC Role / Device Role / Timing Role: Point-of-entry TVS on sensor module PCB, mounted adjacent to connector pins. Use Value: Limits induced surges from nearby motor switching to <100 V, preserving ADC reference integrity and avoiding false readings or latch-up. |
| Consumer Power Adapter Input Stage | Telecom Line Card Surge Protection |
Use Scenario: Secondary-side overvoltage suppression in AC/DC adapters for smart home hubs and IoT gateways. IC Role / Device Role / Timing Role: TVS connected across output capacitor to absorb flyback spikes and rectifier reverse recovery energy. Use Value: Maintains regulated 5 V/12 V output stability during transient overload, meeting UL 62368-1 surge immunity requirements. |
Use Scenario: Front-end protection for Ethernet PHY power rails and auxiliary bias supplies in telecom base station line cards. IC Role / Device Role / Timing Role: Unidirectional clamp on +3.3 V supply feeding Gigabit Ethernet transceivers. Use Value: Prevents latch-up in PHY ICs during EFT bursts (IEC 61000-4-4), sustaining link integrity without reset or packet loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ68AHE3/A | Same VBR (64.6–71.4 V), identical SMA package, but rated for 400 W with 10/1000 µs waveform and not AEC-Q101 qualified | Commercial-grade only; unsuitable for automotive under-hood deployment where AEC-Q101 is mandated | Select when cost-sensitive industrial designs require same clamping performance without automotive qualification |
| 1.5SMC68A | Higher package thermal mass (DO-214AB), 1.5 kW peak power rating, but larger footprint and 125 °C max TJ | Better suited for high-energy surge environments (e.g., outdoor telecom cabinets), but incompatible with space-constrained layouts | Choose when board area allows larger package and higher energy absorption (e.g., >1 kV surge testing) is required |
Compared with SMAJ68AHE3/A, P4SMA68AHM3_A/I adds AEC-Q101 qualification and halogen-free compliance without sacrificing clamping performance; versus 1.5SMC68A, it trades peak power headroom for compact SMA footprint and automotive readiness - making it optimal for space-limited, mission-critical automotive modules.
Availability
P4SMA68AHM3_A/I is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, consumer power adapters, and telecom line cards requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for P4SMA68AHM3_A/I 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The P4SMA68AHM3_A/I belongs to Vishay's TRANSZORB® TVS family, engineered specifically for robust, low-inductance transient suppression in automotive, industrial, and communications systems where AEC-Q101 compliance and consistent clamping behavior are mandatory.
FAQ
What is the clamping voltage of P4SMA68AHM3_A/I under a 10/1000 µs surge?
The P4SMA68AHM3_A/I has a maximum clamping voltage (VC) of 92.0 V at 4.3 A peak pulse current (IPPM) under the standardized 10/1000 µs waveform. This value is measured per Figure 1 and Table on page 2 of Vishay's P4SMA datasheet (Doc. #88367). It ensures downstream components see no more than 92.0 V during surge events, providing a defined safety margin for 60 V-rated circuits. The P4SMA68AHM3_A/I achieves this with low incremental resistance and fast avalanche response.
Is P4SMA68AHM3_A/I qualified for automotive applications?
Yes, P4SMA68AHM3_A/I is AEC-Q101 qualified, as confirmed by its HM3 suffix and explicit listing in Vishay's ordering table (page 3, Doc. #88367). The HM3 designation indicates halogen-free, RoHS-compliant construction plus full AEC-Q101 stress testing - including temperature cycling, high-temperature reverse bias, and ESD. This makes P4SMA68AHM3_A/I suitable for under-hood and chassis-mounted automotive modules where reliability under thermal and mechanical stress is critical.
What does the "_A/I" suffix mean in P4SMA68AHM3_A/I?
The "_A/I" suffix in P4SMA68AHM3_A/I specifies two key attributes: "A" denotes AEC-Q101 qualification for the 6.8 V to 220 V voltage range (per note on page 3), and "I" indicates packaging in 13-inch diameter plastic tape and reel with 7500 units per reel (ordering code P4SMA68AHM3_A/I). This format enables high-speed automated placement and supports extended production runs without reel changeovers. The P4SMA68AHM3_A/I is not a variant - it is the full orderable part number with validated automotive qualification and logistics configuration.
How does P4SMA68AHM3_A/I differ from bidirectional P4SMA68CA variants?
P4SMA68AHM3_A/I is unidirectional, with cathode marked by a band and intended for DC line protection where polarity is fixed (e.g., +12 V rail to ground). In contrast, P4SMA68CA is bidirectional - no polarity marking, symmetric clamping in both directions - used for AC lines or differential signal pairs. Their VBR and VC values differ: P4SMA68AHM3_A/I has VBR = 64.6–71.4 V and VC = 92.0 V, while P4SMA68CA has lower VBR (≈58–64 V) and higher VC (≈100 V). Using P4SMA68AHM3_A/I in place of a bidirectional type would cause forward conduction in reverse-polarity conditions.
What is the thermal resistance of P4SMA68AHM3_A/I, and how does it affect layout?
P4SMA68AHM3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W, measured on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal (per page 2, Doc. #88367). This value assumes minimal PCB copper; adding thermal vias or larger copper pours reduces effective RθJA. For continuous 3.3 W dissipation, ambient must stay below ~40 °C unless enhanced cooling is applied. Layouts should avoid narrow traces and ensure both terminals connect to ≥5 mm² copper areas to maintain safe junction temperatures - especially critical in automotive under-hood applications where ambient may exceed 85 °C.
P4SMA68AHM3_A/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- P4SMA, TransZorb®
- 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):
- 4.3A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
P4SMA68AHM3_A/I FAQ
1.How can I place an order for P4SMA68AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA68AHM3_A/I 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 P4SMA68AHM3_A/I reliable?
The price and inventory of P4SMA68AHM3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA68AHM3_A/I is usually 5 days.
3.What payment methods are accepted for P4SMA68AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA68AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA68AHM3_A/I?
P4SMA68AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA68AHM3_A/I 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 P4SMA68AHM3_A/I?
For technical support, including P4SMA68AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA68AHM3_A/I requirements.
6.How does Aetrix verify that P4SMA68AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All P4SMA68AHM3_A/I 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 P4SMA68AHM3_A/I meets industry standards.
7.What is the process for return or replacement of P4SMA68AHM3_A/I?
All P4SMA68AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA68AHM3_A/I, 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 P4SMA68AHM3_A/I part is unused and in its original packaging.
Return procedure for P4SMA68AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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