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Vishay General Semiconductor - Diodes Division P4SMA33CAHM3/H
- Part No.:
- P4SMA33CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA33CAHM3/H.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,269
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Product details
Overview
P4SMA33CAHM3/H from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on signal and power lines. It features a 33 V breakdown voltage (VBR min/max = 31.4–34.7 V at 1 mA), 28.2 V standoff voltage (VWM), 45.7 V maximum clamping voltage (VC) at 8.8 A peak pulse current, and 400 W peak pulse power rating with 10/1000 µs waveform - suitable for protecting automotive-grade sensor interfaces and industrial I/O circuits.
For engineers reviewing the P4SMA33CAHM3/H datasheet, P4SMA33CAHM3/H pinout, P4SMA33CAHM3/H application, or P4SMA33CAHM3/H equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (RθJA = 120 °C/W), halogen-free RoHS compliance, and real-world protection use cases - all confirmed from Vishay's official P4SMA Series specification document (Rev. 09-Jan-2024, Doc. #88367).
Technical Context
The P4SMA33CAHM3/H operates as a bidirectional avalanche diode, symmetrically clamping transient overvoltages in both polarities without polarity marking. Its glass-passivated junction enables fast response time (<1 ns), low incremental surge resistance, and stable breakdown behavior across -65 °C to +150 °C operating junction temperature range.
Rated for 400 W peak pulse power (derated to 300 W above 91 V), it delivers 8.8 A peak pulse current (IPPM) under 10/1000 µs waveform while maintaining clamping voltage ≤45.7 V - ensuring robust protection of downstream ICs such as microcontrollers, CAN transceivers, and analog front-ends against ESD, inductive switching spikes, and lightning-induced surges.
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 reliable transient detection |
| Standoff Voltage VWM | 28.2 V - maximum continuous reverse working voltage before leakage exceeds 1 μA |
| Clamping Voltage VC | 45.7 V at 8.8 A - limits protected circuit voltage during worst-case 10/1000 µs surge |
| Peak Pulse Power PPPM | 400 W (10/1000 µs) - sustains high-energy transients without failure; derates above 91 V |
| Operating Temperature | -65 °C to +150 °C - supports under-hood automotive and industrial environments |
| Thermal Resistance RθJA | 120 °C/W - determines junction temperature rise under steady-state power dissipation |
| AEC-Q101 Qualified | Yes - validated for automotive electronics per stress test requirements |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Bidirectional construction - no polarity marking on device body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity) | One terminal of symmetrical avalanche junction; conducts during negative transients |
| Cathode | Transient current entry (positive polarity) | Other terminal of symmetrical junction; conducts during positive transients; unmarked on bidirectional variant |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| 400 W peak pulse power | Handles high-energy transients from inductive load switching in motor control and power supply rails |
| AEC-Q101 qualification | Validated reliability for automotive applications including engine control units and ADAS sensor interfaces |
| MSL Level 1 (260 °C) | Supports standard reflow soldering without moisture sensitivity handling restrictions |
| Glass passivated junction | Ensures long-term stability of breakdown voltage and low leakage under thermal cycling |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
Use Scenario: Protecting LIN bus and analog sensor outputs (e.g., pressure, temperature) in engine compartments exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional TVS clamping element placed directly at connector entry point to shunt surge energy before reaching MCU ADC or LIN transceiver. Use Value: Limits transient voltage to ≤45.7 V, preserving signal integrity and preventing latch-up in 3.3 V/5 V sensor interface ICs. |
Use Scenario: Safeguarding RS-485/RS-422 differential data lines in programmable logic controllers (PLCs) subjected to field wiring surges. IC Role / Device Role / Timing Role: Common-mode transient suppressor across differential pair, leveraging symmetrical clamping to maintain signal balance during EFT bursts. Use Value: Maintains <1 ns response time and <1.0 μA leakage at 28.2 V, avoiding signal distortion while meeting IEC 61000-4-4 level 4 immunity. |
| Consumer Power Adapter Input | Telecom Line Card Surge Protection |
Use Scenario: Secondary-side DC input protection in USB-C PD adapters against back-fed surges and capacitor discharge events. IC Role / Device Role / Timing Role: Standoff-rated TVS placed between DC input rail and primary-side controller IC to clamp overvoltage before regulator input. Use Value: Withstands 400 W pulses and maintains 28.2 V working voltage - compatible with 24 V adapter outputs and avoids false triggering. |
Use Scenario: Overvoltage protection on telephone line interface circuits in VoIP gateways exposed to lightning-induced longitudinal surges. IC Role / Device Role / Timing Role: Bidirectional suppressor bridging tip/ring lines to ground, absorbing common-mode energy per GR-1089-CORE requirements. Use Value: 45.7 V clamping ensures telecom ICs (e.g., SLICs) remain within absolute maximum ratings during 10/1000 µs surges up to 1 kV. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33CA | Higher 600 W PPPM rating; larger SMB (DO-214AA) package; RθJA = 85 °C/W | Better suited for higher-power industrial mains inputs where board space allows larger footprint | Select when surge energy exceeds 400 W or thermal margin is critical; not drop-in due to different pad layout |
| 1.5KE33CA | Through-hole TO-218 package; 1500 W PPPM; higher VC = 53.3 V at 28.3 A | Used in legacy power supply designs requiring leaded components and higher surge capacity | Choose for cost-sensitive, non-automotive applications where SMT is not required and PCB layout permits through-hole mounting |
Compared with SMBJ33CA and 1.5KE33CA, the P4SMA33CAHM3/H offers optimal balance of AEC-Q101 qualification, compact SMA footprint, and 400 W capability - making it preferred for space-constrained automotive and industrial SMT designs where halogen-free compliance and MSL Level 1 processing are mandatory.
Availability
P4SMA33CAHM3/H is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, consumer power adapter secondary-side protection, and telecom line interface circuits requiring stable component supply, halogen-free compliance, and AEC-Q101 validation.
Supply support for P4SMA33CAHM3/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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific performance.
The P4SMA Series targets high-reliability transient suppression in automotive, industrial, and communications systems - engineered for fast response, stable clamping, and robust thermal performance in surface-mount layouts.
FAQ
What is the meaning of the "HM3" and "H" suffixes in P4SMA33CAHM3/H?
The "HM3" suffix indicates halogen-free, RoHS-compliant construction with AEC-Q101 qualification; "H" denotes 7-inch tape-and-reel packaging (1800 units per reel). This confirms P4SMA33CAHM3/H meets automotive-grade material and packaging requirements while enabling automated SMT assembly. The full part number P4SMA33CAHM3/H is traceable to Vishay's official ordering matrix in Document #88367.
Is P4SMA33CAHM3/H suitable for protecting a 3.3 V microcontroller I/O line?
No - P4SMA33CAHM3/H has a 28.2 V standoff voltage (VWM) and 31.4–34.7 V breakdown, making it inappropriate for direct protection of 3.3 V logic. It is designed for 24–36 V systems like automotive sensors or industrial power rails. For 3.3 V I/O, a lower-voltage TVS such as SMAJ3.3A or USBLC6-2SC6 would be required. P4SMA33CAHM3/H must be applied only where working voltage aligns with its VWM.
Does P4SMA33CAHM3/H have polarity markings for PCB layout?
No - as a bidirectional TVS, P4SMA33CAHM3/H has no cathode band or polarity marking. Its internal structure is symmetrical, allowing either terminal to serve as anode or cathode depending on transient polarity. PCB layout requires no orientation constraint, simplifying placement and reducing assembly errors compared to unidirectional variants like P4SMA33A.
What is the maximum clamping voltage of P4SMA33CAHM3/H under surge conditions?
The maximum clamping voltage (VC) of P4SMA33CAHM3/H is 45.7 V at 8.8 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is guaranteed per Vishay's datasheet (Document #88367, page 2) and represents the upper voltage limit imposed on protected circuitry during worst-case transient events - critical for verifying compatibility with downstream IC absolute maximum ratings.
How does P4SMA33CAHM3/H perform under elevated ambient temperatures?
P4SMA33CAHM3/H derates linearly above 25 °C ambient: its peak pulse power drops per Figure 2 in Document #88367, reaching ~280 W at 85 °C and ~200 W at 125 °C. Junction temperature must stay ≤150 °C; with RθJA = 120 °C/W, 3.3 W steady-state dissipation raises TJ by 396 °C - so continuous DC power handling is limited to <28 mW. P4SMA33CAHM3/H is intended for transient-only duty, not sustained overload.
P4SMA33CAHM3/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:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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)
P4SMA33CAHM3/H FAQ
1.How can I place an order for P4SMA33CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA33CAHM3/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 P4SMA33CAHM3/H reliable?
The price and inventory of P4SMA33CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA33CAHM3/H is usually 5 days.
3.What payment methods are accepted for P4SMA33CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA33CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA33CAHM3/H?
P4SMA33CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA33CAHM3/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 P4SMA33CAHM3/H?
For technical support, including P4SMA33CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA33CAHM3/H requirements.
6.How does Aetrix verify that P4SMA33CAHM3/H is sourced from the original manufacturer or authorized distributors?
All P4SMA33CAHM3/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 P4SMA33CAHM3/H meets industry standards.
7.What is the process for return or replacement of P4SMA33CAHM3/H?
All P4SMA33CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA33CAHM3/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 P4SMA33CAHM3/H part is unused and in its original packaging.
Return procedure for P4SMA33CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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