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Vishay General Semiconductor - Diodes Division P4SMA33CAHM3/I
- Part No.:
- P4SMA33CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA33CAHM3/I.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,293
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Product details
Overview
P4SMA33CAHM3/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in the P4SMA series, designed for clamping voltage transients on signal or 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 at 8.8 A peak pulse current, and 400 W peak pulse power rating with 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial systems.
For engineers reviewing the P4SMA33CAHM3/I datasheet, P4SMA33CAHM3/I pinout, P4SMA33CAHM3/I application, or P4SMA33CAHM3/I equivalent, this device is selected for robust ESD and surge protection where bidirectional clamping, AEC-Q101 qualification, halogen-free RoHS compliance, and SMA (DO-214AC) package compatibility are required.
Technical Context
The P4SMA33CAHM3/I operates as a bidirectional avalanche diode, symmetrically clamping transient voltages above ±31.4 V and below ±34.7 V in both polarities. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 µA at VWM), while its MSL Level 1 rating supports lead-free reflow up to 260 °C.
It delivers 400 W peak pulse power (derated to 300 W above 91 V) under 10/1000 µs waveform conditions, with thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead). The device is qualified to AEC-Q101 and specified for operation from −65 °C to +150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 31.4 V / 34.7 V at IT = 1 mA - defines precise bidirectional avalanche onset threshold for reliable overvoltage triggering |
| VWM | 28.2 V - maximum continuous reverse working voltage before leakage exceeds 1.0 µA; sets safe operating margin below clamping |
| VC @ IPPM | 45.7 V at 8.8 A - clamped voltage during 400 W transient, limiting downstream stress on protected ICs or MOSFETs |
| PPPM | 400 W (10/1000 µs) - peak surge energy handling capacity; sufficient for IEC 61000-4-5 Level 3 (1 kV/2 Ω) compliance |
| IPPM | 8.8 A - peak pulse current capability directly tied to VC and PPPM; enables protection of medium-power signal lines |
| TJ max | +150 °C - maximum junction temperature enabling use in under-hood automotive or high-ambient industrial environments |
| Package | SMA (DO-214AC) - industry-standard surface-mount outline with 5.0 mm × 5.0 mm copper pad thermal design requirement |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional - no polarity marking; symmetrical terminal configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional conduction path | Either terminal serves as anode or cathode depending on transient polarity; no DC bias dependency |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JEDEC standards |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets environmental compliance requirements for modern automotive and industrial PCB assemblies without compromising performance |
| 400 W peak pulse power (10/1000 µs) | Supports robust protection against lightning-induced surges and inductive switching transients in 12 V/24 V systems |
| Low clamping ratio (VC/VBR ≈ 1.46) | Minimizes overvoltage overshoot during clamping, reducing risk of damage to sensitive downstream components |
| MSL Level 1, 260 °C peak reflow | Enables standard lead-free SMT assembly without moisture sensitivity concerns or baking requirements |
Applications
| Automotive Sensor Interface Protection | Industrial CAN Bus Line Protection |
|---|---|
Use Scenario: Protecting analog sensor outputs (e.g., pressure, temperature) in engine control units from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed across differential or single-ended signal lines upstream of ADC input or op-amp buffer. Use Value: Limits transient voltage to ≤45.7 V, preserving signal integrity and preventing latch-up in 3.3 V or 5 V interface ICs. |
Use Scenario: Safeguarding CANH/CANL lines in vehicle body control modules against ESD (IEC 61000-4-2) and burst noise (IEC 61000-4-4). IC Role / Device Role / Timing Role: Low-capacitance bidirectional suppressor mounted directly at connector entry point to shunt fast transients before transceiver input. Use Value: Clamps 8.8 A surges within nanoseconds while maintaining <1.0 µA leakage at 28.2 V, ensuring CAN bus signal fidelity and bit timing stability. |
| Telecom Power Supply Input Protection | Consumer Device USB Port ESD Protection |
Use Scenario: Secondary-side overvoltage suppression on 12 V or 24 V telecom power rails exposed to field wiring surges. IC Role / Device Role / Timing Role: Parallel-connected TVS across DC input terminals to absorb repetitive 400 W transients without degradation. Use Value: Withstands ≥1000 surges at rated PPPM, extending system uptime in outdoor base station power supplies. |
Use Scenario: Board-level ESD protection for USB 2.0 data lines (D+/D−) in portable audio devices and smart home hubs. IC Role / Device Role / Timing Role: Bidirectional clamp placed adjacent to USB connector to divert ±8 kV contact discharge per IEC 61000-4-2. Use Value: Sub-100 ps response time and 45.7 V clamping prevent data corruption and PHY damage during human-body-model events. |
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 VBR range (31.4–34.7 V), but SMB package (DO-214AA); 600 W PPPM, higher thermal mass | Better suited for higher-energy surges; requires larger PCB footprint and different pad layout | Select when higher pulse power margin or legacy SMB footprint compatibility is needed |
| 1.5SMC33CA | Same VBR/VC specs, but SMC (DO-214AB) package; 1500 W PPPM, higher IPPM (33.3 A) | Designed for primary-side AC/DC input protection; not optimized for fine-pitch signal-line placement | Choose for front-end power rail protection where space allows and surge energy exceeds 400 W |
Compared with SMBJ33CA and 1.5SMC33CA, the P4SMA33CAHM3/I offers optimal balance of compact SMA footprint, AEC-Q101 qualification, and 400 W surge capability - making it preferred for space-constrained, automotive-grade signal-line protection where board area and reliability certification are critical.
Availability
P4SMA33CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial CAN bus nodes, telecom power inputs, and consumer USB port protection requiring stable component supply and full traceability.
Supply support for P4SMA33CAHM3/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, efficiency, and application-specific optimization.
The P4SMA series was developed for high-reliability transient suppression in automotive, industrial, and telecom systems - delivering standardized SMA-packaged TVS diodes with AEC-Q101 qualification, halogen-free materials, and consistent clamping performance.
FAQ
What is the breakdown voltage tolerance of the P4SMA33CAHM3/I?
The P4SMA33CAHM3/I has a breakdown voltage (VBR) range of 31.4 V to 34.7 V at test current IT = 1 mA, representing a ±5.0 % tolerance around the nominal 33 V rating. This tight distribution ensures predictable clamping onset across production lots and supports robust design margining in safety-critical circuits.
Is the P4SMA33CAHM3/I suitable for automotive applications?
Yes, the P4SMA33CAHM3/I is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant construction validated for automotive use. It operates from −65 °C to +150 °C and meets MSL Level 1, making it appropriate for engine control, body electronics, and ADAS sensor protection per ISO 16750 and ISO 7637-2 requirements.
What does the "CA" suffix mean in P4SMA33CAHM3/I?
The "CA" suffix in P4SMA33CAHM3/I denotes a bidirectional configuration - meaning the device provides symmetrical transient suppression in both polarities, with identical VBR, VWM, and VC specifications for positive and negative transients. This eliminates need for polarity-aware placement and simplifies layout for AC-coupled or differential signal lines.
How does the clamping voltage of P4SMA33CAHM3/I compare to its standoff voltage?
The P4SMA33CAHM3/I has a standoff voltage (VWM) of 28.2 V and a maximum clamping voltage (VC) of 45.7 V at 8.8 A, yielding a clamping ratio of ~1.62. This ratio reflects the device's ability to limit overvoltage while maintaining low leakage at normal operating voltage - critical for protecting 3.3 V or 5 V logic interfaces without false triggering.
What is the thermal resistance of the P4SMA33CAHM3/I in standard mounting?
The P4SMA33CAHM3/I 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 terminal, and a junction-to-lead resistance (RθJL) of 30 °C/W. These values assume recommended pad layout per Vishay document 88367 and are essential for calculating safe power derating above 25 °C ambient.
P4SMA33CAHM3/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:
- -
- 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/I FAQ
1.How can I place an order for P4SMA33CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA33CAHM3/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 P4SMA33CAHM3/I reliable?
The price and inventory of P4SMA33CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA33CAHM3/I is usually 5 days.
3.What payment methods are accepted for P4SMA33CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA33CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA33CAHM3/I?
P4SMA33CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA33CAHM3/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 P4SMA33CAHM3/I?
For technical support, including P4SMA33CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA33CAHM3/I requirements.
6.How does Aetrix verify that P4SMA33CAHM3/I is sourced from the original manufacturer or authorized distributors?
All P4SMA33CAHM3/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 P4SMA33CAHM3/I meets industry standards.
7.What is the process for return or replacement of P4SMA33CAHM3/I?
All P4SMA33CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA33CAHM3/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 P4SMA33CAHM3/I part is unused and in its original packaging.
Return procedure for P4SMA33CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P4SMA33CAHM3/I Tags
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