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Vishay General Semiconductor - Diodes Division P4SMA33CAHM3_A/H
- Part No.:
- P4SMA33CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA33CAHM3_A/H.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,598
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Product details
Overview
P4SMA33CAHM3_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 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, and 400 W peak pulse power rating with 10/1000 µs waveform - used to protect MOSFETs, sensor interfaces, and communication lines in automotive and industrial control systems.
For engineers reviewing the P4SMA33CAHM3_A/H datasheet, P4SMA33CAHM3_A/H pinout, P4SMA33CAHM3_A/H application, or P4SMA33CAHM3_A/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance, low incremental surge resistance, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
The P4SMA33CAHM3_A/H operates as a bidirectional avalanche diode, exhibiting symmetrical clamping behavior in both polarities without polarity marking. Its glass-passivated junction ensures stable breakdown characteristics and fast response time (<1 ns), enabling effective suppression of ESD, lightning-induced surges, and inductive switching transients.
Thermally, it supports operation from –65 °C to +150 °C junction temperature, with 120 °C/W junction-to-ambient thermal resistance under standard PCB mounting. Derating applies above 25 °C ambient, and peak pulse power drops to 300 W for devices rated above 91 V - though P4SMA33CAHM3_A/H maintains full 400 W rating per its 33 V classification.
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 protected circuitry. |
| VBR (Breakdown Voltage) | 37.1–41.0 V at 1 mA - guaranteed avalanche onset range; ensures predictable turn-on during overvoltage events. |
| VC (Clamping Voltage) | 45.7 V at 8.8 A IPPM - peak voltage seen by downstream circuit during 10/1000 µs transient; determines protection level for sensitive ICs. |
| PPPM (Peak Pulse Power) | 400 W - energy-handling capacity under standardized 10/1000 µs surge; sufficient for IEC 61000-4-5 Level 3 (1 kV/2 Ω) threats. |
| Package | SMA (DO-214AC) - industry-standard surface-mount outline with 5.0 mm × 5.0 mm thermal pad footprint; optimized for automated assembly and thermal dissipation. |
| Qualification | AEC-Q101 qualified & halogen-free - certified for automotive-grade reliability; meets JESD201 Class 2 whisker resistance and MSL Level 1 (260 °C reflow). |
| Leakage Current | ≤1.0 µA at 33 V - negligible standby power loss and minimal impact on high-impedance signal paths. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; no polarity marking for bidirectional configuration; compliant with UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional avalanche junction terminals | No functional distinction - either terminal serves as input/output for transient energy; enables placement without orientation check in layout. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 µs) | Enables robust protection against severe transients like load dump or ISO 7637-2 Pulse 5a without derating below 91 V threshold. |
| AEC-Q101 qualification + HM3 suffix | Validated for automotive electronics including engine control units, body modules, and ADAS sensor interfaces requiring long-term field reliability. |
| Glass-passivated chip junction | Ensures stable VBR tolerance and low leakage across temperature and lifetime; eliminates risk of junction degradation under repeated surge stress. |
| Low-profile SMA package | 0.208" × 0.157" footprint with 0.090" height - fits space-constrained PCBs while maintaining thermal performance via 5.0 mm × 5.0 mm copper pads. |
| Halogen-free & RoHS-compliant | Meets automotive environmental standards (e.g., ELV, IMDS); eliminates brominated flame retardants without compromising UL 94 V-0 rating. |
Applications
| Automotive Sensor Interface Protection | Industrial CAN Bus Line Protection |
|---|---|
Use Scenario: Protecting analog output lines of pressure, temperature, and position sensors in engine bay and chassis modules exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional clamping device placed across sensor supply and ground or differential signal pair (e.g., LIN or SENT). Use Value: Limits transient voltage to ≤45.7 V during 400 W surges, preventing damage to 3.3 V/5 V sensor ASICs and ensuring signal integrity under ISO 16750-2 conditions. |
Use Scenario: Safeguarding CANH/CANL lines in vehicle ECUs and gateways against ESD (IEC 61000-4-2 ±8 kV contact) and coupled transients from nearby solenoids or motors. IC Role / Device Role / Timing Role: Low-capacitance TVS connected line-to-line and line-to-ground to suppress common-mode and differential-mode surges without distorting 1 Mbps CAN signaling. Use Value: Clamps surges within nanoseconds while adding <1 pF junction capacitance at 0 V - preserving signal edge rate and bus timing margins. |
| Consumer IoT Power Input Protection | Telecom DSL/ADSL Line Protection |
Use Scenario: Securing 5 V/12 V DC input rails of smart home hubs, gateways, and battery-powered edge devices subjected to hot-plug and adapter surge events. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main power entry point, upstream of DC-DC converters and LDOs. Use Value: Absorbs 400 W pulses without failure, maintaining system uptime during accidental 24 V misconnection or lightning-induced coupling on shared AC/DC infrastructure. |
Use Scenario: Protecting ADSL line drivers and receivers in DSLAMs and customer premises equipment from induced surges on twisted-pair telephone lines. IC Role / Device Role / Timing Role: Bidirectional TVS installed across tip/ring pair and to ground to shunt longitudinal and transverse surges per ITU-T K.20/K.21. Use Value: Withstands repetitive 10/1000 µs surges up to 400 W while holding leakage <1 µA - avoiding false triggers and preserving low-noise line 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/VBR/VC specs but SMB (DO-214AA) package - 25 % larger footprint and higher RθJA (100 °C/W vs. 120 °C/W). | Preferred where board space allows larger pad layout and higher thermal mass is needed for sustained surge duty cycles. | Select SMBJ33CA only if PCB layout accommodates 4.5 mm × 3.9 mm footprint and thermal design targets >1000 pulses/hour. |
| 1.5KE33CA | Through-hole DO-201 package; same electrical specs but 1.5 kW peak power rating - over-specified for most SMT designs. | Used in legacy industrial power supplies where through-hole assembly remains standard and manual repair is required. | Choose 1.5KE33CA only when retrofitting existing through-hole boards or when mechanical robustness outweighs SMT automation benefits. |
Compared with SMBJ33CA and 1.5KE33CA, the P4SMA33CAHM3_A/H delivers identical clamping performance in the smallest surface-mount form factor with AEC-Q101 and halogen-free compliance - making it optimal for new automotive and space-constrained industrial designs requiring zero orientation dependency and automated placement.
Availability
P4SMA33CAHM3_A/H is available at Aetrix Electronics and suitable for automotive sensor protection, industrial CAN bus hardening, and consumer IoT power rail safeguarding requiring stable component supply, consistent AEC-Q101 qualification, and halogen-free compliance across production batches.
Supply support for P4SMA33CAHM3_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 devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The P4SMA series was developed for high-volume, space-constrained transient protection in automotive, industrial, and telecom systems - prioritizing AEC-Q101 qualification, low-profile packaging, and repeatable clamping performance under real-world surge stress.
FAQ
What is the clamping voltage of P4SMA33CAHM3_A/H at its rated peak pulse current?
The P4SMA33CAHM3_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 defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream ICs rated for ≤48 V operation remain undamaged.
Is P4SMA33CAHM3_A/H suitable for automotive applications?
Yes, the P4SMA33CAHM3_A/H is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant construction validated for automotive use. It meets JESD201 Class 2 whisker resistance and MSL Level 1 reflow requirements, making it appropriate for engine control units, body electronics, and ADAS sensor modules where reliability under thermal cycling and vibration is mandatory.
How does the bidirectional nature of P4SMA33CAHM3_A/H affect PCB layout?
The P4SMA33CAHM3_A/H has no polarity marking and functions identically in both directions, eliminating orientation constraints during placement. This simplifies PCB layout and automated assembly - no silkscreen polarity indicator is needed, and the device can be rotated 180° without affecting performance. Its symmetrical structure also supports line-to-line or line-to-ground configurations without redesign.
What is the thermal resistance of P4SMA33CAHM3_A/H, and how does it impact derating?
The P4SMA33CAHM3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per datasheet Figure 2. This value directly governs power derating: above 25 °C ambient, allowable peak pulse power decreases linearly - e.g., at 75 °C TA, PPPM drops to ~320 W, requiring verification against expected surge repetition rate and duration in the target application.
Does P4SMA33CAHM3_A/H meet any safety certifications?
Yes, the P4SMA33CAHM3_A/H carries Underwriters Laboratory (UL) Recognition under file E136766 for protector classification per UL 497B, covering both unidirectional and bidirectional variants. This certification validates its suitability for use in safety-critical secondary circuits where transient suppression must comply with recognized insulation and failure-mode requirements - particularly relevant for telecom and industrial power interface designs.
P4SMA33CAHM3_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:
- 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_A/H FAQ
1.How can I place an order for P4SMA33CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA33CAHM3_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 P4SMA33CAHM3_A/H reliable?
The price and inventory of P4SMA33CAHM3_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 P4SMA33CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for P4SMA33CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA33CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA33CAHM3_A/H?
P4SMA33CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA33CAHM3_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 P4SMA33CAHM3_A/H?
For technical support, including P4SMA33CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA33CAHM3_A/H requirements.
6.How does Aetrix verify that P4SMA33CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All P4SMA33CAHM3_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 P4SMA33CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of P4SMA33CAHM3_A/H?
All P4SMA33CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA33CAHM3_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 P4SMA33CAHM3_A/H part is unused and in its original packaging.
Return procedure for P4SMA33CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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