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Vishay General Semiconductor - Diodes Division P4SMA33AHM3_A/H
- Part No.:
- P4SMA33AHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA33AHM3_A/H.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,158
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Product details
Overview
P4SMA33AHM3_A/H from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, rated for 33 V standoff voltage (VWM), 37.5 V minimum breakdown voltage (VBR), and 45.7 V maximum clamping voltage (VC) at 8.8 A peak pulse current (IPPM), designed to protect sensitive ICs and MOSFETs against inductive switching transients and ESD in automotive and industrial power rails.
For engineers reviewing the P4SMA33AHM3_A/H datasheet, P4SMA33AHM3_A/H pinout, P4SMA33AHM3_A/H application, or P4SMA33AHM3_A/H equivalent, this device delivers AEC-Q101 qualification, 400 W peak pulse power (10/1000 µs), low incremental surge resistance, and MSL Level 1 moisture sensitivity - critical for high-reliability automotive ECUs and industrial motor drives requiring robust overvoltage immunity without layout redesign.
Technical Context
The P4SMA33AHM3_A/H operates as a unidirectional clamping TVS diode, leveraging a glass-passivated silicon junction to achieve fast response (<1 ns) and stable breakdown characteristics across -65 °C to +150 °C junction temperature range. Its clamping action begins at VBR ≥ 37.5 V and limits transient energy to ≤45.7 V at 8.8 A IPPM under standardized 10/1000 µs waveform conditions.
Designed for surface-mount assembly on 0.2" × 0.2" copper pads per terminal, it exhibits RθJA = 120 °C/W and RθJL = 30 °C/W thermal resistance, enabling reliable operation at PD = 3.3 W with derating above TA = 25 °C. Polarity is marked by cathode band; no marking applies to bidirectional variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 28.2 V - Maximum continuous reverse operating voltage before significant leakage; defines safe DC/AC rail margin before clamping initiates. |
| VBR (Breakdown Voltage) | 31.4–34.7 V at IT = 1.0 mA - Confirmed voltage range where device transitions from high-impedance to low-impedance clamping state. |
| VC (Clamping Voltage) | 45.7 V at IPPM = 8.8 A - Peak voltage seen by protected circuit during worst-case 10/1000 µs transient; determines downstream component stress. |
| PPPM (Peak Pulse Power) | 400 W - Transient energy-handling capability under standard 10/1000 µs waveform; supports repetitive surges at 0.01% duty cycle. |
| ID (Reverse Leakage) | 1.0 µA max at VWM - Ensures minimal standby power loss and signal integrity in high-impedance sensing or logic interfaces. |
| TJ max | +150 °C - Enables deployment in under-hood automotive environments and thermally constrained industrial enclosures. |
| AEC-Q101 Qualified | Yes - Validated for automotive electronics per stress test requirements including HTOL, TCT, and ESD; supports PPAP documentation. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile plastic case with matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards. Cathode indicated by band; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink node | Connected to protected line (e.g., 24 V rail); conducts surge current to ground when voltage exceeds VBR. |
| Anode (unbanded end) | Reference / return path | Typically tied to system ground or low-impedance return plane; completes clamping loop during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 µs) | Supports high-energy transients from relay coil de-energization or load dump in 12/24 V systems without failure. |
| Glass passivated chip junction | Ensures long-term stability of VBR and leakage under thermal cycling and humidity exposure per AEC-Q101. |
| MSL Level 1 (260 °C peak reflow) | Enables single-pass lead-free reflow assembly without popcorn cracking or delamination risk. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Fulfills environmental compliance for automotive Tier 1 supply chains and EU industrial equipment directives. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (<1 ns response), improving protection margin for 3.3 V/5 V logic. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protecting microcontroller GPIOs and CAN transceiver power rails from load dump and alternator ripple in 12 V vehicle networks. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between 12 V supply and ground, triggered within nanoseconds upon voltage exceeding 33 V. Use Value: Limits transient voltage to ≤45.7 V, preventing latch-up or gate oxide damage in 3.3 V MCU I/O drivers and CAN PHYs. |
Use Scenario: Shielding 24 V digital input channels from field-wiring induced surges in factory automation cabinets. IC Role / Device Role / Timing Role: Primary overvoltage clamp on optocoupler input side, absorbing 1 kV/µs transients from solenoid switching. Use Value: Maintains <1 µA leakage at 24 V nominal, preserving input threshold accuracy while surviving repeated 400 W pulses. |
| Telecom Power Supply Front-End | Consumer Appliance Motor Driver Stage |
Use Scenario: Safeguarding AC-DC converter primary-side controllers against lightning-induced surges on 48 V telecom distribution lines. IC Role / Device Role / Timing Role: Secondary-level TVS on DC bus rail, activated after MOV clamping to handle residual energy. Use Value: Provides precise 33 V clamping with ±1.65 V VBR tolerance, enabling tighter design margins than generic Zener-based solutions. |
Use Scenario: Suppressing back-EMF spikes from brushed DC motors in smart home appliances (e.g., vacuum cleaners, blenders). IC Role / Device Role / Timing Role: Unidirectional TVS across motor terminals, conducting flyback current into local bulk capacitor. Use Value: Withstands 40 A IFSM (8.3 ms half-sine), ensuring reliability across >100,000 motor start-stop cycles per AEC-Q101 lifetime testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A-E3/5A | Same VWM (28.2 V), higher VC (49.9 V), lower PPPM (400 W same), non-AEC-Q101, commercial-grade only. | Lacks automotive qualification; suitable for cost-sensitive industrial or consumer designs where AEC-Q101 is not mandated. | Select SMAJ33A-E3/5A if AEC-Q101 is unnecessary and board space allows identical SMA footprint. |
| 1.5SMC33A | Higher package (DO-214AB), larger footprint, same VWM/VC specs, 1500 W PPPM rating, commercial grade. | Better suited for high-energy surge environments (e.g., outdoor telecom), but requires PCB layout change due to larger body. | Choose 1.5SMC33A only when surge energy exceeds 400 W and DO-214AB mounting is acceptable. |
Compared with SMAJ33A-E3/5A and 1.5SMC33A, the P4SMA33AHM3_A/H uniquely combines AEC-Q101 qualification, halogen-free construction, and SMA footprint - making it the only drop-in solution for automotive production programs requiring zero-layout-change migration from legacy TVS devices.
Availability
P4SMA33AHM3_A/H is available at Aetrix Electronics and suitable for automotive electronic control units, industrial programmable logic controllers, and telecom power supply front-ends requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for P4SMA33AHM3_A/H 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, TVS, and MOSFETs with emphasis on reliability, efficiency, and application-specific optimization.
The P4SMA Series targets high-volume automotive and industrial transient protection, delivering AEC-Q101 qualified, halogen-free TVS diodes in compact SMA packages for space-constrained, high-reliability power rail designs.
FAQ
What is the clamping voltage of the P4SMA33AHM3_A/H at its rated peak pulse current?
The P4SMA33AHM3_A/H has a maximum clamping voltage (VC) of 45.7 V at 8.8 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured per Figure 1 in Vishay Document 88367 and defines the upper voltage limit imposed on protected circuits during transient events. The P4SMA33AHM3_A/H maintains this clamping performance across its full operating temperature range (-65 °C to +150 °C) with minimal drift.
Is the P4SMA33AHM3_A/H suitable for automotive applications?
Yes, the P4SMA33AHM3_A/H is AEC-Q101 qualified and specifically designated for automotive use via the HM3 suffix (halogen-free, RoHS-compliant, and AEC-Q101 qualified). It meets stress test requirements including high-temperature operating life, temperature cycling, and ESD robustness. The P4SMA33AHM3_A/H is commonly deployed in body control modules, infotainment power supplies, and ADAS sensor interfaces where certified reliability is mandatory.
What does the "_A/H" suffix mean in P4SMA33AHM3_A/H?
The "_A/H" suffix in P4SMA33AHM3_A/H indicates two distinct ordering attributes: "A" denotes the revision level (per Vishay's note that _A is used for P4SMA6.8A to P4SMA220A variants), and "H" specifies the packaging format - 7-inch diameter plastic tape and reel with 1800 units per reel. This matches the ordering information table in Document 88367, confirming the P4SMA33AHM3_A/H is supplied in standard SMT-compatible reel format.
How does the P4SMA33AHM3_A/H compare to bidirectional TVS diodes like P4SMA33CA?
The P4SMA33AHM3_A/H is unidirectional and features polarity marking (cathode band), whereas P4SMA33CA is bidirectional with no polarity marking and symmetric clamping in both directions. The P4SMA33AHM3_A/H offers lower leakage (<1 µA at VWM) and is optimized for DC rail protection (e.g., 24 V supply to ground), while P4SMA33CA suits AC signal lines or differential buses where polarity reversal may occur. Their VWM, VBR, and VC values differ accordingly.
What is the thermal resistance of the P4SMA33AHM3_A/H, and how does it affect PCB layout?
The P4SMA33AHM3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead resistance (RθJL) of 30 °C/W, measured on 0.2" × 0.2" copper pads per terminal. To maintain safe operation at its 3.3 W steady-state power dissipation, PCB layout must provide adequate copper area and avoid thermal bottlenecks near the SMA footprint. Reducing pad size or omitting thermal vias increases junction temperature and accelerates parameter drift - especially critical in automotive under-hood deployments of the P4SMA33AHM3_A/H.
P4SMA33AHM3_A/H 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:
- 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)
P4SMA33AHM3_A/H FAQ
1.How can I place an order for P4SMA33AHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA33AHM3_A/H 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 P4SMA33AHM3_A/H reliable?
The price and inventory of P4SMA33AHM3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA33AHM3_A/H is usually 5 days.
3.What payment methods are accepted for P4SMA33AHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA33AHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA33AHM3_A/H?
P4SMA33AHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA33AHM3_A/H 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 P4SMA33AHM3_A/H?
For technical support, including P4SMA33AHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA33AHM3_A/H requirements.
6.How does Aetrix verify that P4SMA33AHM3_A/H is sourced from the original manufacturer or authorized distributors?
All P4SMA33AHM3_A/H 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 P4SMA33AHM3_A/H meets industry standards.
7.What is the process for return or replacement of P4SMA33AHM3_A/H?
All P4SMA33AHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA33AHM3_A/H, 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 P4SMA33AHM3_A/H part is unused and in its original packaging.
Return procedure for P4SMA33AHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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