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Vishay General Semiconductor - Diodes Division P4SMA33AHM3/I
- Part No.:
- P4SMA33AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA33AHM3/I.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,684
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Product details
Overview
P4SMA33AHM3/I from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, rated for 33 V breakdown voltage (VBR = 31.4–34.7 V at 1 mA), 28.2 V standoff voltage (VWM), and 45.7 V clamping voltage (VC) at 8.8 A peak pulse current - designed to protect MOSFETs, ICs, and sensor signal lines in automotive powertrain control modules against inductive switching transients.
For engineers reviewing the P4SMA33AHM3/I datasheet, P4SMA33AHM3/I pinout, P4SMA33AHM3/I application, or P4SMA33AHM3/I equivalent, this page delivers verified electrical specs, AEC-Q101 qualification status, thermal resistance (RθJA = 120 °C/W), halogen-free RoHS compliance, and real-world clamping performance under 10/1000 µs surge conditions.
Technical Context
This unidirectional TVS operates with a glass-passivated junction and exhibits fast response time (<1 ns), low incremental surge resistance, and excellent clamping ratio (VC/VBR ≈ 1.42). It sustains 400 W peak pulse power (10/1000 µs waveform) at TA = 25 °C, derating linearly above 25 °C per Figure 2.
Designed for automated SMT placement, it meets J-STD-020 MSL Level 1 (peak reflow 260 °C), JESD201 Class 2 whisker resistance, and UL 94 V-0 flammability. The cathode band denotes polarity; terminals are matte tin-plated and solderable per J-STD-002 and JESD22-B102.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 31.4 V / 34.7 V at IT = 1 mA - defines precise voltage threshold where avalanche conduction begins reliably |
| VWM | 28.2 V - maximum continuous reverse working voltage before leakage exceeds 1 µA |
| VC @ IPPM | 45.7 V at 8.8 A - clamped voltage during 10/1000 µs surge, limiting stress on downstream circuitry |
| PPPM | 400 W - peak transient power handling capability under standardized surge waveform |
| IFSM | 40 A - single half-sine surge current rating (8.3 ms), critical for load-dump protection |
| RθJA | 120 °C/W - thermal resistance junction-to-ambient on standard 0.2" × 0.2" copper pads |
| TJ max | +150 °C - maximum junction temperature enabling operation in under-hood automotive environments |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile plastic case with matte tin-plated leads; cathode indicated by black band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to protected circuit ground reference | Provides low-impedance path to ground during transient events when cathode is held at higher potential |
| Cathode | Current exit terminal in forward bias; marked with black band | Connected to the line or node requiring overvoltage protection; clamps to VC when voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and transmission modules |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets environmental compliance requirements for Tier 1 automotive supply chains |
| 400 W peak pulse power (10/1000 µs) | Robust surge immunity suitable for ISO 7637-2 Pulse 1, 2a, and 5a load-dump events |
| Low clamping ratio (VC/VBR ≈ 1.42) | Minimizes overvoltage overshoot during fast transients, preserving sensitive gate oxides |
| MSL Level 1, 260 °C peak reflow | Enables compatibility with standard lead-free SMT assembly without moisture sensitivity concerns |
Applications
| Automotive Powertrain Control | Industrial Motor Drive Inputs |
|---|---|
Use Scenario: Protecting microcontroller I/O and gate drivers in engine ECU against alternator load dump and inductive kickback from solenoid valves. IC Role / Device Role / Timing Role: Unidirectional TVS placed between MCU GPIO and external harness interface to clamp negative-going transients to ground. Use Value: Limits transient voltage to ≤45.7 V, preventing latch-up or oxide rupture in 3.3 V/5 V logic interfaces while surviving 40 A surge currents. |
Use Scenario: Safeguarding PLC analog input channels and encoder signal lines from back-EMF spikes generated by AC induction motor switching. IC Role / Device Role / Timing Role: Standoff protection device mounted directly at connector entry point to shunt surges before reaching precision op-amps or ADC front-ends. Use Value: Maintains signal integrity with <1 µA leakage at 28.2 V, ensuring minimal offset error in 16-bit measurement systems. |
| Telecom Base Station DC Feeds | Consumer Appliance Power Supply Rails |
Use Scenario: Shielding 48 V DC power inputs in remote radio units from lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary-level TVS on main DC input rail, coordinated with upstream GDT and downstream polymer PTC for staged protection. Use Value: Responds in <1 ns to suppress 1 kV/µs transients, reducing let-through energy to <10 mJ before secondary protection activates. |
Use Scenario: Securing 24 V auxiliary rails in smart washing machine control boards against relay contact bounce and transformer inrush spikes. IC Role / Device Role / Timing Role: Low-capacitance (≈100 pF at 0 V) unidirectional clamp on microcontroller VDD supply line. Use Value: Prevents brownout resets and firmware corruption by holding rail voltage within ±10 % of nominal during 100 ms surges up to 400 W. |
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 VBR range (31.4–34.7 V), but rated for 400 W with 1.0 mm² copper pad; RθJA = 130 °C/W vs. 120 °C/W | Not AEC-Q101 qualified; intended for commercial/industrial use only | Select when automotive qualification is not required and cost optimization is prioritized |
| 1.5SMC33A-H | Higher package thermal mass (SMC/DO-214AB); same VBR, VC, and PPPM, but larger footprint and RθJA = 100 °C/W | Better thermal dissipation in high-ambient industrial enclosures; incompatible with SMA land pattern | Choose for designs needing enhanced long-duration surge margin and board space permits larger package |
Compared with SMAJ33A-E3/5A and 1.5SMC33A-H, the P4SMA33AHM3/I uniquely combines AEC-Q101 qualification, halogen-free construction, and optimized thermal resistance for space-constrained automotive PCBs - making it the preferred choice where reliability, regulatory compliance, and compact layout coexist.
Availability
P4SMA33AHM3/I is available at Aetrix Electronics and suitable for automotive powertrain control, industrial motor drive inputs, telecom base station DC feeds, and consumer appliance power supply rails requiring stable component supply across extended production lifecycles.
Supply support for P4SMA33AHM3/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, TVS devices, and optoelectronics with emphasis on reliability and automotive-grade validation.
The P4SMA Series targets high-reliability transient suppression in harsh environments, with design focus on AEC-Q101 compliance, low-profile SMT integration, and consistent clamping performance across temperature and surge repetition rates.
FAQ
What is the clamping voltage of the P4SMA33AHM3/I under a 10/1000 µs surge?
The P4SMA33AHM3/I clamps to 45.7 V at its rated peak pulse current of 8.8 A under a 10/1000 µs waveform. This value is measured per Figure 1 and Table on page 2 of the Vishay datasheet 88367, and reflects the maximum voltage seen by protected circuitry during standardized transient events - critical for ensuring safe operation of 3.3 V or 5 V logic interfaces downstream.
Is the P4SMA33AHM3/I qualified for automotive applications?
Yes, the P4SMA33AHM3/I is AEC-Q101 qualified, as confirmed by the "HM3" suffix and documentation in Vishay's P4SMA series datasheet (Rev. 09-Jan-2024). This qualification covers stress testing for temperature cycling, humidity bias, mechanical shock, and surge robustness - validating its use in engine control units, body electronics, and ADAS subsystems where reliability is mission-critical.
What does the "HM3" suffix indicate for the P4SMA33AHM3/I?
The "HM3" suffix on P4SMA33AHM3/I specifies halogen-free, RoHS-compliant construction with AEC-Q101 qualification. Per Vishay's ordering guide (page 3), HM3 denotes both environmental compliance and automotive-grade reliability - distinguishing it from commercial-grade "E3" or "M3" variants and confirming suitability for Tier 1 automotive supply chains requiring strict material declarations.
Can the P4SMA33AHM3/I be used in bidirectional configurations?
No, the P4SMA33AHM3/I is a unidirectional TVS diode, as indicated by its part number ending in "A" (not "CA") and explicit designation in the Vishay datasheet Table on page 2. Bidirectional operation requires CA-suffix variants like P4SMA33CA; using P4SMA33AHM3/I in reverse-biased signal paths would result in forward conduction and failure to suppress positive transients.
What is the thermal resistance junction-to-ambient for the P4SMA33AHM3/I?
The P4SMA33AHM3/I has a typical thermal resistance of RθJA = 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in the Thermal Characteristics table (page 3) of Vishay document 88367. This value is essential for calculating junction temperature rise under sustained power dissipation and verifying safe operation at +150 °C maximum.
P4SMA33AHM3/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:
- Discontinued at Digi-Key
- 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/I FAQ
1.How can I place an order for P4SMA33AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA33AHM3/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 P4SMA33AHM3/I reliable?
The price and inventory of P4SMA33AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA33AHM3/I is usually 5 days.
3.What payment methods are accepted for P4SMA33AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA33AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA33AHM3/I?
P4SMA33AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA33AHM3/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 P4SMA33AHM3/I?
For technical support, including P4SMA33AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA33AHM3/I requirements.
6.How does Aetrix verify that P4SMA33AHM3/I is sourced from the original manufacturer or authorized distributors?
All P4SMA33AHM3/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 P4SMA33AHM3/I meets industry standards.
7.What is the process for return or replacement of P4SMA33AHM3/I?
All P4SMA33AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA33AHM3/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 P4SMA33AHM3/I part is unused and in its original packaging.
Return procedure for P4SMA33AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P4SMA33AHM3/I Tags
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