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Vishay General Semiconductor - Diodes Division P4SMA33A-M3/5A
- Part No.:
- P4SMA33A-M3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA33A-M3/5A.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,457
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Product details
Overview
P4SMA33A-M3/5A from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal lines. It features a 33 V breakdown voltage (VBR = 31.4–34.7 V at 1 mA), 28.2 V standoff voltage (VWM), 45.7 V maximum clamping voltage at 8.8 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 industrial power supplies.
For engineers reviewing the P4SMA33A-M3/5A datasheet, P4SMA33A-M3/5A pinout, P4SMA33A-M3/5A application, or P4SMA33A-M3/5A equivalent, this page delivers verified electrical parameters, thermal derating behavior, clamping performance under surge conditions, and direct alternatives qualified for automotive-grade and commercial ESD/surge protection designs.
Technical Context
The P4SMA33A-M3/5A operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low incremental surge resistance, enabling fast response (<1 ns) to transient events such as inductive switching spikes and ESD.
Thermal design relies on RθJA = 120 °C/W (typ.) and RθJL = 30 °C/W (typ.), with derating above 25 °C ambient per Figure 2. It supports repetitive 0.01% duty cycle surges up to 400 W below 91 V and 300 W above - validated on 0.2" × 0.2" copper pads per JEDEC test conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 31.4 V / 34.7 V at IT = 1 mA - defines precise clamping onset range for overvoltage detection |
| VWM | 28.2 V - maximum continuous reverse operating voltage before leakage exceeds 1 μA |
| VC @ IPPM | 45.7 V at 8.8 A - clamped voltage during 10/1000 µs surge, limiting downstream stress |
| PPPM | 400 W - peak transient power handling capacity under standard surge waveform |
| IFSM | 40 A - single half-sine surge current rating (8.3 ms), critical for inrush immunity |
| TJ max | +150 °C - maximum junction temperature, enabling operation in high-ambient industrial environments |
| Package | SMA (DO-214AC) - surface-mount footprint compatible with automated assembly and IPC-7351B land patterns |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, UL 94 V-0 rated, MSL Level 1 (260 °C reflow peak).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Reverse-biased anode connection point | Connected to protected line; conducts during overvoltage to shunt energy to ground |
| Anode | Reference/ground return path | Typically tied to system ground or low-impedance return plane for effective clamping |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 µs) | Enables robust protection against IEC 61000-4-5 Level 4 surges without external heat sinking |
| Low clamping ratio (VC/VBR ≈ 1.42) | Minimizes voltage overshoot across protected ICs, preserving margin for 3.3 V/5 V logic rails |
| Glass passivated junction | Ensures long-term parameter stability and low leakage (<1 μA at VWM) over temperature and life |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets environmental compliance requirements for industrial and automotive supply chains |
| AEC-Q101 qualified option available | Supports automotive subsystems requiring certified reliability (P4SMA33AHM3_A variant) |
Applications
| Industrial Power Supply Protection | Automotive Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 24 V DC input rails in PLC modules from load dump and relay coil flyback. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input rail and chassis ground to clamp transients before they reach DC-DC converters. Use Value: Limits voltage to ≤45.7 V during 8.8 A surge, preventing damage to 36 V-rated input stages and maintaining system uptime. |
Use Scenario: Safeguarding CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) in engine control units. IC Role / Device Role / Timing Role: Localized TVS on each signal line near connector entry to suppress ESD (IEC 61000-4-2 ±8 kV) and coupled noise. Use Value: Sub-1 ns response and <1 μA leakage at 28.2 V preserve signal integrity while meeting AEC-Q101 qualification requirements. |
| Telecom Line Card Surge Protection | Consumer Device USB/Power Input Protection |
Use Scenario: Secondary-level protection on -48 V telecom distribution boards exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Standoff device in series with primary GDT or MOV, providing precise clamping after coarse suppression. Use Value: Tight VBR tolerance (±5%) ensures predictable coordination with upstream protectors and avoids false triggering. |
Use Scenario: Input-stage protection for wall adapters and portable chargers handling 5–20 V USB PD inputs. IC Role / Device Role / Timing Role: First-line defense against plug-in surges and hot-swap transients on VBUS lines. Use Value: 400 W rating and 0.064 g unit weight support compact, cost-effective designs without sacrificing surge margin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33A (Bourns) | Same VWM (28.2 V), higher PPPM (600 W), SMB package (larger footprint) | Better suited for higher-energy surges; requires PCB layout change due to larger SMB (DO-214AA) footprint | Select when surge energy exceeds 400 W or when board space allows larger package for enhanced thermal margin |
| 1.5SMC33A (ON Semiconductor) | Identical VBR, VWM, VC; same SMA package; 400 W rating; halogen-free option available (1.5SMC33AHE3) | Drop-in replacement with identical mechanical and electrical specs; qualified to AEC-Q101 in HE3 variant | Choose for second-source assurance with no layout or firmware changes required |
Compared with P4SMA33A-M3/5A, SMBJ33A offers higher surge capacity but demands PCB redesign, while 1.5SMC33A provides true pin-and-parameter compatibility - making it ideal for BOM flexibility without compromising clamping performance or thermal behavior.
Availability
P4SMA33A-M3/5A is available at Aetrix Electronics and suitable for industrial power supplies, automotive sensor modules, telecom line cards, and consumer USB power input circuits requiring stable component supply, halogen-free compliance, and repeatable surge protection performance.
Supply support for P4SMA33A-M3/5A 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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The P4SMA Series belongs to Vishay's TRANSZORB® TVS portfolio, engineered for high-reliability transient suppression in harsh environments - targeting industrial automation, automotive electronics, and infrastructure equipment where consistent clamping and long-term stability are critical.
FAQ
What is the maximum clamping voltage of the P4SMA33A-M3/5A under surge conditions?
The P4SMA33A-M3/5A has a maximum clamping voltage (VC) of 45.7 V at 8.8 A peak pulse current (IPPM) using the standard 10/1000 µs waveform. This value is measured per JEDEC test conditions on 0.2" × 0.2" copper pads and represents the upper limit of voltage seen by downstream circuitry during transient events - critical for ensuring safe operation of 3.3 V or 5 V logic interfaces protected by the P4SMA33A-M3/5A.
Is the P4SMA33A-M3/5A suitable for automotive applications?
The P4SMA33A-M3/5A itself is a commercial-grade part (M3 suffix), but Vishay offers the AEC-Q101 qualified variant P4SMA33AHM3_A for automotive use. While the P4SMA33A-M3/5A meets RoHS and halogen-free requirements and shares identical electrical specs, only the HM3_A version is tested to AEC-Q101 stress standards - so P4SMA33A-M3/5A is appropriate for non-safety-critical automotive subsystems where qualification is not mandated, but full compliance requires the HM3_A variant.
What does the "M3/5A" suffix mean in P4SMA33A-M3/5A?
In P4SMA33A-M3/5A, "M3" denotes halogen-free, RoHS-compliant construction with JESD201 Class 2 whisker resistance, while "/5A" specifies packaging in 13-inch diameter tape-and-reel format containing 7500 units. This differs from /61 (7-inch reel, 1800 units) and enables high-volume SMT placement. The base "P4SMA33A" identifies the 33 V unidirectional TVS die; no functional difference exists between M3/5A and other M3 variants beyond packaging and reel size.
How does the P4SMA33A-M3/5A compare to bidirectional TVS diodes like P4SMA33CA?
The P4SMA33A-M3/5A is unidirectional and intended for DC line protection where polarity is fixed (e.g., +24 V rail to ground), offering lower leakage and tighter VBR tolerance than its bidirectional counterpart P4SMA33CA. The CA version supports AC or floating signal lines but exhibits higher reverse leakage and slightly wider VBR spread. For a 24 V DC system, P4SMA33A-M3/5A delivers superior clamping precision and lower standby loss - confirming its role as the optimal choice for polarized power rail protection.
What thermal derating applies to the P4SMA33A-M3/5A above 25 °C ambient?
The P4SMA33A-M3/5A follows linear derating per Figure 2 in the Vishay datasheet: peak pulse power decreases by approximately 0.83% per °C above 25 °C ambient, based on RθJA = 120 °C/W. At 75 °C ambient, its usable PPPM drops to ~200 W. Derating must be applied when estimating sustained surge capability in enclosed enclosures or high-temperature environments - essential for reliable field operation of P4SMA33A-M3/5A in industrial motor drives or outdoor telecom gear.
P4SMA33A-M3/5A 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):
- 28.2V
- Voltage - Breakdown (Min):
- 31.4V
- Voltage - Clamping (Max) @ Ipp:
- 45.7V
- Current - Peak Pulse (10/1000µs):
- 8.8A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
P4SMA33A-M3/5A FAQ
1.How can I place an order for P4SMA33A-M3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA33A-M3/5A 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 P4SMA33A-M3/5A reliable?
The price and inventory of P4SMA33A-M3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA33A-M3/5A is usually 5 days.
3.What payment methods are accepted for P4SMA33A-M3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA33A-M3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA33A-M3/5A?
P4SMA33A-M3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA33A-M3/5A 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 P4SMA33A-M3/5A?
For technical support, including P4SMA33A-M3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA33A-M3/5A requirements.
6.How does Aetrix verify that P4SMA33A-M3/5A is sourced from the original manufacturer or authorized distributors?
All P4SMA33A-M3/5A 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 P4SMA33A-M3/5A meets industry standards.
7.What is the process for return or replacement of P4SMA33A-M3/5A?
All P4SMA33A-M3/5A units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA33A-M3/5A, 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 P4SMA33A-M3/5A part is unused and in its original packaging.
Return procedure for P4SMA33A-M3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P4SMA33A-M3/5A Tags
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