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Vishay General Semiconductor - Diodes Division P4SMA33A-E3/5A
- Part No.:
- P4SMA33A-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA33A-E3/5A.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
P4SMA33A-E3/5A from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection in 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 clamping voltage (VC) at 8.8 A peak pulse current, and 400 W peak pulse power rating with 10/1000 µs waveform - deployed in automotive sensor interfaces, industrial I/O protection, and DC power rail surge suppression.
For engineers reviewing the P4SMA33A-E3/5A datasheet, P4SMA33A-E3/5A pinout, P4SMA33A-E3/5A application, or P4SMA33A-E3/5A equivalent, key selection criteria include unidirectional polarity, SMA (DO-214AC) package compatibility, 150 °C max junction temperature, RoHS-compliant matte tin plating, and AEC-Q101 qualification readiness (via HE3/HM3 variants).
Technical Context
This TVS diode operates as a clamping device that remains high-impedance below VWM (28.2 V) and rapidly transitions to low-impedance conduction above VBR (min. 31.4 V), limiting transient voltages to ≤45.7 V at 8.8 A. Its glass-passivated junction ensures stable avalanche behavior and low leakage (<1 µA at VWM).
Thermal performance is defined by RθJA = 120 °C/W (junction-to-ambient, on recommended 5.0 mm × 5.0 mm copper pads) and RθJL = 30 °C/W (junction-to-lead), supporting reliable operation up to 150 °C junction temperature under repetitive surge conditions with 0.01% duty cycle.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage VBR | 31.4–34.7 V at 1 mA - defines precise avalanche initiation threshold for repeatable clamping onset |
| Standoff Voltage VWM | 28.2 V - maximum continuous reverse operating voltage before leakage exceeds 1 µA |
| Clamping Voltage VC | 45.7 V at 8.8 A (10/1000 µs) - peak voltage seen by protected circuit during worst-case surge |
| Peak Pulse Power PPPM | 400 W - energy-handling capacity for transient suppression without failure under standard waveform |
| Package | SMA (DO-214AC) - surface-mount outline with 5.28 mm length, 4.50 mm width, 2.29 mm height, MSL Level 1 |
| Junction Temperature Range | −65 °C to +150 °C - supports operation in under-hood automotive and industrial ambient environments |
| Leakage Current ID | <1 µA at VWM - ensures minimal power loss and signal integrity in standby or low-power states |
Pinout & Package
SMA (DO-214AC) package with axial lead configuration: cathode indicated by band; anode and cathode terminals are co-planar, optimized for automated placement and reflow soldering per J-STD-002/JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink node | Connected to protected line; conducts surge current to ground when VLINE > VBR |
| Anode | Reference/return path | Typically tied to system ground or low-impedance return plane; completes clamping current path |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 µs) | Enables protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 24 V systems without derating |
| Glass passivated junction | Ensures stable, low-drift avalanche characteristics over lifetime and temperature (±0.098 %/°C VBR TC) |
| MSL Level 1, 260 °C peak reflow | Supports single-pass lead-free assembly without moisture-related popcorning or delamination |
| AEC-Q101 qualification option (HE3/HM3) | Validates reliability for automotive applications including engine control, ADAS sensors, and body electronics |
| Low incremental surge resistance | Minimizes VC overshoot during fast transients, improving margin for 3.3 V/5 V logic interface protection |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load dump and inductive switching transients in vehicle ECUs. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between signal line and chassis ground, responding within <1 ns to suppress spikes up to 400 W. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V sensor interface ICs while maintaining signal fidelity below 28.2 V normal operation. |
Use Scenario: Safeguarding digital input modules in programmable logic controllers against 24 V DC supply surges caused by relay coil flyback or field wiring faults. IC Role / Device Role / Timing Role: Standoff-rated TVS on each isolated input channel, conducting only during >31.4 V transients to shunt current away from optocoupler inputs. Use Value: Extends mean time between failures (MTBF) of I/O modules by eliminating false triggering and component degradation from repetitive 100–500 V transients. |
| DC Power Rail Protection | Telecom Line Interface |
Use Scenario: Secondary overvoltage protection on 24 V or 36 V intermediate distribution rails feeding FPGAs, microcontrollers, and PMICs in embedded systems. IC Role / Device Role / Timing Role: Parallel-connected unidirectional TVS referenced to system ground, clamping rail voltage to ≤45.7 V during lightning-induced surges. Use Value: Complements primary protection (e.g., MOVs or GDTs) by providing fast, low-clamp response to residual transients that bypass bulk suppressors. |
Use Scenario: Protecting Ethernet PHY front-end circuits and PoE-powered device interfaces from ESD and induced surges on RJ45 data lines. IC Role / Device Role / Timing Role: Low-capacitance TVS (CJ ≈ 100 pF at VWM) placed across differential pairs to clamp common-mode transients without distorting 100 Mbps signals. Use Value: Maintains signal integrity while meeting IEC 61000-4-2 Level 4 (15 kV air/8 kV contact) ESD immunity requirements. |
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 (Vishay) | Higher 600 W PPPM rating; SMB package (larger footprint, lower RθJA = 85 °C/W) | Better suited for higher-energy surges where board space allows larger package | Select SMBJ33A when system-level surge testing requires >400 W margin or thermal budget is constrained |
| 1.5SMC33A (ON Semiconductor) | Identical VWM/VBR/VC specs; same SMA package; 400 W rating; RoHS-compliant but not AEC-Q101 qualified | Lacks automotive qualification path; suitable for commercial/industrial use only | Choose 1.5SMC33A for cost-sensitive non-automotive designs where AEC-Q101 is not mandated |
Compared with P4SMA33A-E3/5A, SMBJ33A offers greater surge energy handling in a physically larger package, while 1.5SMC33A provides identical electrical performance without automotive qualification - enabling trade-offs between reliability assurance, thermal design, and application scope.
Availability
P4SMA33A-E3/5A is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and DC power rail protection requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for P4SMA33A-E3/5A 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, precision, and application-specific optimization.
The P4SMA Series is engineered for high-reliability transient suppression in space-constrained surface-mount applications, targeting automotive, industrial, and telecom systems where consistent clamping, low leakage, and AEC-Q101 readiness are critical.
FAQ
What is the maximum clamping voltage of the P4SMA33A-E3/5A under standard test conditions?
The P4SMA33A-E3/5A has a maximum clamping voltage (VC) of 45.7 V when subjected to an 8.8 A peak pulse current with a 10/1000 µs waveform. This value is measured at TA = 25 °C and reflects the highest voltage the protected circuit will experience during a standardized surge event. The P4SMA33A-E3/5A maintains this clamping performance across its rated operating temperature range, making it suitable for demanding environments.
Is the P4SMA33A-E3/5A suitable for automotive applications?
The P4SMA33A-E3/5A itself is RoHS-compliant and built on Vishay's AEC-Q101-qualified platform, but the "E3/5A" suffix denotes commercial-grade packaging (tape-and-reel). For full automotive qualification, specify P4SMA33AHE3_A or P4SMA33AHM3_A - these variants carry explicit AEC-Q101 certification. The P4SMA33A-E3/5A shares identical electrical and thermal specs, enabling drop-in prototyping before final automotive-grade release.
What does the "-E3/5A" suffix indicate in P4SMA33A-E3/5A?
The "-E3" denotes RoHS-compliant, commercial-grade construction with matte tin-plated leads; "/5A" specifies packaging in 13-inch diameter plastic tape-and-reel with 7500 units per reel. This format supports high-volume SMT assembly and is distinct from "/61" (7-inch reel, 1800 units) and automotive "HE3" variants. The P4SMA33A-E3/5A is fully compatible with standard SMA footprint layouts and J-STD-020 reflow profiles.
How does the thermal resistance of the P4SMA33A-E3/5A affect PCB layout?
The P4SMA33A-E3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on minimum recommended 5.0 mm × 5.0 mm copper pads per terminal. To maintain TJ ≤ 150 °C under repetitive 400 W pulses, designers must ensure adequate copper area and avoid thermal bottlenecks. Reducing pad size or omitting thermal vias increases RθJA, risking premature thermal runaway - a key consideration for the P4SMA33A-E3/5A in high-duty-cycle applications.
Can the P4SMA33A-E3/5A be used in bidirectional configurations?
No - the P4SMA33A-E3/5A is a unidirectional TVS diode, identified by its "A" suffix and cathode band marking. For bidirectional protection, Vishay offers the P4SMA33CA series (e.g., P4SMA33CA-E3/5A), which provides symmetrical clamping in both polarities. Using the unidirectional P4SMA33A-E3/5A in AC or floating signal paths may result in forward conduction and failure; always match device polarity to circuit topology.
P4SMA33A-E3/5A 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-E3/5A FAQ
1.How can I place an order for P4SMA33A-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA33A-E3/5A 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-E3/5A reliable?
The price and inventory of P4SMA33A-E3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA33A-E3/5A is usually 5 days.
3.What payment methods are accepted for P4SMA33A-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA33A-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA33A-E3/5A?
P4SMA33A-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA33A-E3/5A 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-E3/5A?
For technical support, including P4SMA33A-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA33A-E3/5A requirements.
6.How does Aetrix verify that P4SMA33A-E3/5A is sourced from the original manufacturer or authorized distributors?
All P4SMA33A-E3/5A 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-E3/5A meets industry standards.
7.What is the process for return or replacement of P4SMA33A-E3/5A?
All P4SMA33A-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA33A-E3/5A, 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-E3/5A part is unused and in its original packaging.
Return procedure for P4SMA33A-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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