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Vishay General Semiconductor - Diodes Division P4SMA33CAHE3_A/H
- Part No.:
- P4SMA33CAHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA33CAHE3_A/H.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
P4SMA33CAHE3_A/H from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) in SMA (DO-214AC) package, designed for clamping voltage transients on signal and power lines. It features a 33 V standoff voltage (VWM), 37.1–41.0 V breakdown voltage (VBR) at 1 mA, 45.7 V maximum clamping voltage (VC) at 8.8 A peak pulse current (IPPM), and 400 W peak pulse power (10/1000 µs waveform), targeting protection of MOSFETs, ICs, and sensor signal lines in automotive and industrial systems.
For engineers reviewing the P4SMA33CAHE3_A/H datasheet, P4SMA33CAHE3_A/H pinout, P4SMA33CAHE3_A/H application, or P4SMA33CAHE3_A/H equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (RθJA = 120 °C/W), clamping performance under standardized surge waveforms, and direct alternatives for ESD/lightning transient suppression in 12 V–24 V DC systems.
Technical Context
The P4SMA33CAHE3_A/H operates as a bidirectional avalanche diode, symmetrically clamping both positive and negative transients without polarity dependence. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1 µA at VWM), while meeting MSL Level 1 (260 °C reflow peak) and AEC-Q101 qualification for automotive-grade reliability.
It delivers 400 W peak pulse power per 10/1000 µs waveform when mounted on 5.0 mm × 5.0 mm copper pads, with derated capability (300 W) above 91 V - though not applicable here, as its VBR range (37.1–41.0 V) places it firmly in the 400 W rating tier. Junction temperature is rated from –65 °C to +150 °C, supporting operation in under-hood and industrial control environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 33 V - Maximum continuous reverse working voltage before clamping initiates; defines safe operating margin for 24 V nominal systems. |
| VBR (Breakdown Voltage) | 37.1–41.0 V at 1 mA - Confirmed avalanche onset range; ensures predictable turn-on during fast transients. |
| VC (Clamping Voltage) | 45.7 V at 8.8 A IPPM - Peak voltage seen by protected circuit during 10/1000 µs surge; critical for IC I/O voltage tolerance. |
| PPPM (Peak Pulse Power) | 400 W (10/1000 µs) - Sustains high-energy surges common in automotive load-dump or inductive switching events. |
| ID (Reverse Leakage) | <1 µA at 33 V - Negligible standby current; avoids signal distortion or battery drain in always-on circuits. |
| TJ max. | +150 °C - Enables use in high-ambient environments such as engine control units or industrial motor drives. |
| AEC-Q101 Qualified | Yes - Validated for automotive applications including powertrain, body electronics, and ADAS sensor interfaces. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional device with no polarity marking - symmetrical terminal configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals function identically; connects across protected line (e.g., CAN_H/CAN_L or RS-485 A/B) without orientation dependency. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of differential or AC-coupled lines (e.g., CAN, RS-485, audio) without external polarity management. |
| 400 W peak pulse power (10/1000 µs) | Withstands ISO 7637-2 Pulse 1, 2a, 3a/b and IEC 61000-4-5 surge events in automotive ECUs and industrial PLCs. |
| AEC-Q101 qualified & RoHS-compliant | Meets automotive reliability requirements including temperature cycling, HAST, and mechanical shock; supports PPAP documentation. |
| Low incremental surge resistance | Minimizes clamping voltage overshoot during fast-rising transients (e.g., ESD >15 kV contact), improving system-level immunity. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles; no pre-baking required prior to assembly. |
Applications
| Automotive Sensor Interface Protection | Industrial RS-485 Data Line Protection |
|---|---|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine bay modules exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional TVS placed across sensor output and ground to clamp ± transients before they reach ADC input or signal conditioner. Use Value: Limits voltage excursion to ≤45.7 V during 10/1000 µs surges, preserving 3.3 V or 5 V rail integrity and preventing latch-up in downstream signal chain ICs. |
Use Scenario: Safeguarding RS-485 transceivers in factory automation controllers connected to long cable runs susceptible to lightning-induced surges. IC Role / Device Role / Timing Role: Placed differentially between A and B bus lines to suppress common-mode and differential-mode transients without disrupting DC bias. Use Value: Maintains signal integrity under IEC 61000-4-5 Level 3 (1 kV line-earth, 0.5 kV line-line) testing due to symmetrical 45.7 V clamping and sub-1 µA leakage. |
| Consumer USB-C Port ESD Protection | Telecom DSL Line Surge Suppression |
Use Scenario: Secondary-level ESD protection on USB-C CC and VCONN lines in portable docking stations where primary protection resides upstream. IC Role / Device Role / Timing Role: Fast-response TVS absorbing 15 kV HBM ESD pulses before they propagate into USB PD controller or level shifters. Use Value: Achieves <1 ns response time and clamps below 50 V, ensuring compliance with USB-IF ESD robustness requirements without adding capacitance that degrades 10 Gbps signaling. |
Use Scenario: Front-end surge protection on DSL line interface cards handling POTS/ADSL/VDSL signals in central office equipment. IC Role / Device Role / Timing Role: Mounted across tip/ring pair to shunt induced surges from lightning or power cross events before reaching line driver/receiver ICs. Use Value: Handles repetitive 400 W surges per ITU-T K.20/K.21 standards while maintaining low leakage (<1 µA) to avoid affecting line impedance or echo cancellation performance. |
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 | Same VWM (33 V), higher PPPM (600 W), larger SMB (DO-214AA) package (4.5 mm × 3.9 mm vs. SMA's 4.9 mm × 3.9 mm). | Better suited for higher-energy surges but requires larger PCB footprint; not drop-in compatible due to different pad layout. | Select SMBJ33CA only if surge energy exceeds 400 W and board space allows SMB footprint. |
| 1.5KE33CA | Same VWM (33 V), same bidirectional function, but through-hole DO-15 package and higher VC (53.3 V at 12.3 A). | Used in legacy or high-reliability through-hole designs; clamps less tightly than P4SMA33CAHE3_A/H, risking marginal IC overvoltage. | Choose 1.5KE33CA only for through-hole prototyping or repair; avoid in new surface-mount automotive designs requiring tight clamping. |
Compared with SMBJ33CA and 1.5KE33CA, the P4SMA33CAHE3_A/H offers optimal balance of compact SMA footprint, AEC-Q101 qualification, and precise 45.7 V clamping - making it preferred for space-constrained, automotive-grade, surface-mount transient suppression where layout density and reliability are prioritized over raw power rating.
Availability
P4SMA33CAHE3_A/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial RS-485 networks, consumer USB-C port protection, and telecom DSL line surge suppression requiring stable component supply, AEC-Q101 traceability, and RoHS-compliant sourcing.
Supply support for P4SMA33CAHE3_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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The P4SMA Series is engineered for robust transient suppression in automotive, industrial, and communications systems - delivering standardized 400 W surge capability, AEC-Q101 qualification, and surface-mount scalability across 6.8 V to 440 V standoff voltages.
FAQ
What is the clamping voltage of P4SMA33CAHE3_A/H at its rated peak pulse current?
The P4SMA33CAHE3_A/H has a maximum clamping voltage (VC) of 45.7 V at 8.8 A peak pulse current (IPPM), measured under the standardized 10/1000 µs waveform. This value is confirmed in the Electrical Characteristics table on page 2 of Vishay document 88367 and defines the upper voltage limit imposed on protected circuitry during surge events. The P4SMA33CAHE3_A/H maintains this clamping performance consistently across its operational temperature range.
Is P4SMA33CAHE3_A/H qualified for automotive applications?
Yes, P4SMA33CAHE3_A/H is AEC-Q101 qualified, as explicitly stated in the "Mechanical Data" section and ordering information table of Vishay document 88367. The "HE3" suffix denotes RoHS-compliance and AEC-Q101 qualification, and the "_A/H" revision code confirms its inclusion in the qualified variant group for P4SMA6.8(C)A to P4SMA220(C)A devices. This makes the P4SMA33CAHE3_A/H suitable for automotive powertrain, body control, and ADAS sensor modules.
What is the package type and mounting compatibility of P4SMA33CAHE3_A/H?
P4SMA33CAHE3_A/H uses the SMA (DO-214AC) surface-mount package, with dimensions of 4.93 mm × 3.99 mm × 2.29 mm and a recommended 5.0 mm × 5.0 mm copper pad layout per terminal. It is compatible with standard reflow soldering processes, meets MSL Level 1 per J-STD-020, and requires no pre-bake. The P4SMA33CAHE3_A/H is not pin-compatible with SMB or SMC packages due to differing land patterns and thermal pad requirements.
How does P4SMA33CAHE3_A/H differ from unidirectional variants like P4SMA33AHE3_A/H?
The P4SMA33CAHE3_A/H is bidirectional (denoted by "CA"), meaning it clamps voltage transients equally in both polarities - ideal for differential lines like CAN or RS-485. In contrast, P4SMA33AHE3_A/H is unidirectional ("A"), with a cathode band marking and asymmetric behavior: it conducts only in reverse bias. Their VWM, VBR, and VC values differ slightly (e.g., P4SMA33AHE3_A/H has VWM = 28.2 V), so they are not interchangeable without circuit redesign. The P4SMA33CAHE3_A/H eliminates need for polarity-aware placement.
What is the maximum reverse leakage current of P4SMA33CAHE3_A/H at its standoff voltage?
The maximum reverse leakage current (ID) of P4SMA33CAHE3_A/H is 1.0 µA at its 33 V standoff voltage (VWM), tested at TA = 25 °C. This ultra-low leakage preserves signal integrity in high-impedance sensor interfaces and avoids unnecessary power loss in battery-operated systems. The value is specified in the "Electrical Characteristics" table for part number (+)P4SMA33CA and applies directly to P4SMA33CAHE3_A/H as a member of the same variant group.
P4SMA33CAHE3_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:
- -
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
P4SMA33CAHE3_A/H FAQ
1.How can I place an order for P4SMA33CAHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA33CAHE3_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 P4SMA33CAHE3_A/H reliable?
The price and inventory of P4SMA33CAHE3_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 P4SMA33CAHE3_A/H is usually 5 days.
3.What payment methods are accepted for P4SMA33CAHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA33CAHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA33CAHE3_A/H?
P4SMA33CAHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA33CAHE3_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 P4SMA33CAHE3_A/H?
For technical support, including P4SMA33CAHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA33CAHE3_A/H requirements.
6.How does Aetrix verify that P4SMA33CAHE3_A/H is sourced from the original manufacturer or authorized distributors?
All P4SMA33CAHE3_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 P4SMA33CAHE3_A/H meets industry standards.
7.What is the process for return or replacement of P4SMA33CAHE3_A/H?
All P4SMA33CAHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA33CAHE3_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 P4SMA33CAHE3_A/H part is unused and in its original packaging.
Return procedure for P4SMA33CAHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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