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Vishay General Semiconductor - Diodes Division P4SMA33AHE3_A/H
- Part No.:
- P4SMA33AHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA33AHE3_A/H.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,366
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Product details
Overview
P4SMA33AHE3_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 breakdown voltage (VBR = 31.4–34.7 V at 1.0 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 against inductive switching transients and ESD in automotive and industrial power rails.
For engineers reviewing the P4SMA33AHE3_A/H datasheet, P4SMA33AHE3_A/H pinout, P4SMA33AHE3_A/H application, or P4SMA33AHE3_A/H equivalent, this AEC-Q101 qualified, RoHS-compliant TVS offers verified 400 W peak pulse power (10/1000 µs), low incremental surge resistance, and MSL Level 1 reflow compatibility - critical for high-reliability board-level surge protection design.
Technical Context
This unidirectional TVS operates by avalanche breakdown above its 28.2 V standoff threshold, clamping transient voltages to ≤45.7 V within nanoseconds while handling up to 8.8 A peak pulse current. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low leakage (<1.0 µA at VWM).
Designed for surface-mount assembly on 5.0 mm × 5.0 mm copper pads, it delivers 3.3 W steady-state power dissipation and supports operating junction temperatures from –65 °C to +150 °C. The cathode band marking enables unambiguous polarity identification during automated placement.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 31.4 V / 34.7 V at 1.0 mA - defines precise avalanche initiation range for repeatable clamping behavior |
| VWM | 28.2 V - maximum continuous reverse working voltage before leakage exceeds 1.0 µA |
| VC @ IPPM | 45.7 V at 8.8 A - clamped voltage during 10/1000 µs surge, limiting downstream stress |
| PPPM | 400 W - peak pulse power handling capability under standard lightning-surge waveform |
| RθJA | 120 °C/W - thermal resistance from junction to ambient, guiding PCB copper pad sizing |
| TJ max | +150 °C - maximum junction temperature enabling operation in under-hood automotive environments |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102; cathode identified by black band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to protected circuit ground or low-side return path in unidirectional clamp configuration |
| Cathode | Current exit terminal during reverse-biased clamping | Connected to protected line (e.g., 24 V rail); band-marked end ensures correct orientation during placement |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 µs) | Enables robust protection against ISO 7637-2 Pulse 1/2a/5a surges without derating below 91 V |
| Glass passivated chip junction | Ensures stable VBR over lifetime and immunity to humidity-induced parameter drift |
| MSL Level 1 (260 °C peak) | Supports single-reflow assembly without moisture sensitivity concerns or baking requirements |
| AEC-Q101 qualification | Validates reliability for automotive powertrain, body control, and ADAS modules requiring long-term field stability |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., relay coil flyback) |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Clamp |
|---|---|
|
Use Scenario: Protecting 24 V supply lines in engine control units (ECUs) from load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Unidirectional TVS placed between rail and chassis ground to shunt >30 V transients away from downstream regulators and microcontrollers. Use Value: Clamps 120 V/200 ms load dump events to ≤45.7 V, preventing damage to 36 V-rated DC-DC converters and CAN transceivers. |
Use Scenario: Shielding analog output lines of pressure/temperature sensors in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: Low-capacitance TVS installed at connector interface to suppress ESD (IEC 61000-4-2 ±8 kV contact) and cable-coupled noise. Use Value: Limits transient voltage to <46 V within <1 ns, preserving 12-bit ADC accuracy and avoiding latch-up in op-amp front-ends. |
| Consumer Power Adapter Input Stage | Telecom DC Feeder Surge Guard |
|
Use Scenario: Safeguarding primary-side rectifier and controller ICs in universal-input AC/DC adapters against line surges. IC Role / Device Role / Timing Role: Mounted across bulk capacitor input to clamp differential-mode surges induced by nearby lightning strikes. Use Value: Absorbs 400 W pulses without degradation, maintaining system uptime and meeting UL 1449 Type 4 component requirements. |
Use Scenario: Protecting PoE-powered devices (e.g., IP cameras) connected to outdoor Ethernet runs exposed to induced lightning currents. IC Role / Device Role / Timing Role: Paired unidirectional TVS on each DC feed line (48 V) to clamp common-mode surges before reaching PD controller. Use Value: Withstands repeated 10/1000 µs surges up to 8.8 A, ensuring compliance with IEEE 802.3bt Class 5 surge immunity testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A-E3/5A | Same VBR (31.4–34.7 V), identical SMA package, but rated for 400 W only up to 91 V; no AEC-Q101 qualification | Limited to commercial/industrial use; not approved for automotive production programs | Select when AEC-Q101 is not required and cost optimization is prioritized over automotive traceability |
| 1.5SMC33A | Higher package thermal mass (DO-214AB), 33 V VBR, 400 W rating, but larger footprint and no AEC-Q101 data | Requires PCB redesign due to 7.1 mm × 6.2 mm outline vs. SMA's 4.5 mm × 2.8 mm | Choose only if higher steady-state power dissipation (5.0 W) justifies layout change and automotive qualification is unnecessary |
Compared with SMAJ33A-E3/5A and 1.5SMC33A, P4SMA33AHE3_A/H uniquely combines AEC-Q101 qualification, SMA footprint compatibility, and full 400 W rating - making it the only drop-in solution for automotive Tier-1 suppliers needing zero-layout-change migration from legacy TVS designs.
Availability
P4SMA33AHE3_A/H is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor interfaces, consumer power adapters, and telecom PoE equipment requiring stable component supply with guaranteed long-term manufacturability and automotive-grade traceability.
Supply support for P4SMA33AHE3_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 high-reliability diodes, MOSFETs, and passive components for automotive, industrial, and computing markets.
The P4SMA Series targets board-level transient protection in space-constrained, high-reliability applications - engineered specifically for AEC-Q101 compliance, automated SMT assembly, and robust surge immunity in harsh electrical environments.
FAQ
What is the clamping voltage of P4SMA33AHE3_A/H at its rated peak pulse current?
The P4SMA33AHE3_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 the Vishay datasheet 88367 and reflects the actual voltage seen by protected circuitry during surge events - critical for ensuring downstream components remain within their absolute maximum ratings. The P4SMA33AHE3_A/H maintains this performance across its full operating temperature range.
Is P4SMA33AHE3_A/H suitable for automotive applications?
Yes, P4SMA33AHE3_A/H is explicitly AEC-Q101 qualified, as confirmed in the Vishay ordering information table (Revision 09-Jan-2024, Document 88367). It undergoes rigorous stress testing including temperature cycling, high-temperature reverse bias, and ESD - making it approved for use in automotive powertrain, body electronics, and ADAS systems. The "HE3" suffix denotes RoHS-compliant and AEC-Q101 qualified construction, distinguishing it from commercial-grade variants.
What does the "_A/H" suffix mean in P4SMA33AHE3_A/H?
The "_A/H" suffix in P4SMA33AHE3_A/H indicates two key attributes: "A" denotes the revision level (per Note 1 on page 3 of datasheet 88367, confirming _A is used for P4SMA6.8(C)A to P4SMA220(C)A), and "H" specifies the packaging format - 7-inch diameter plastic tape and reel with 1800 units per reel. This ordering code ensures traceability to Vishay's qualified manufacturing lot and matches the MSL Level 1 reflow profile required for automotive SMT lines.
How does P4SMA33AHE3_A/H differ from bidirectional TVS diodes like P4SMA33CA?
P4SMA33AHE3_A/H is unidirectional, meaning it conducts only in reverse avalanche mode and blocks forward current - ideal for DC rail protection where polarity is fixed. In contrast, P4SMA33CA is bidirectional, offering symmetrical clamping for AC or floating signal lines. The P4SMA33AHE3_A/H features a cathode band for polarity identification, while bidirectional types have no marking. Electrical differences include lower VWM (28.2 V vs. 23.1 V for the CA variant) and distinct test current conditions.
What is the thermal resistance of P4SMA33AHE3_A/H, and how does it affect PCB layout?
P4SMA33AHE3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on minimum recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes standard FR-4 PCB with no internal planes. To maintain TJ ≤ 150 °C under 3.3 W steady-state dissipation, designers must allocate sufficient copper area and consider airflow - undersized pads will cause premature thermal shutdown or parametric shift. The P4SMA33AHE3_A/H datasheet provides exact pad dimensions in Figure 5.
P4SMA33AHE3_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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
P4SMA33AHE3_A/H FAQ
1.How can I place an order for P4SMA33AHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA33AHE3_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 P4SMA33AHE3_A/H reliable?
The price and inventory of P4SMA33AHE3_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 P4SMA33AHE3_A/H is usually 5 days.
3.What payment methods are accepted for P4SMA33AHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA33AHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA33AHE3_A/H?
P4SMA33AHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA33AHE3_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 P4SMA33AHE3_A/H?
For technical support, including P4SMA33AHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA33AHE3_A/H requirements.
6.How does Aetrix verify that P4SMA33AHE3_A/H is sourced from the original manufacturer or authorized distributors?
All P4SMA33AHE3_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 P4SMA33AHE3_A/H meets industry standards.
7.What is the process for return or replacement of P4SMA33AHE3_A/H?
All P4SMA33AHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA33AHE3_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 P4SMA33AHE3_A/H part is unused and in its original packaging.
Return procedure for P4SMA33AHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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