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Vishay General Semiconductor - Diodes Division P4SMA350A-E3/61
- Part No.:
- P4SMA350A-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA350A-E3/61.pdf
- Description:
- TVS DIODE 300VWM 482VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
P4SMA350A-E3/61 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, rated for 350 V standoff voltage (VWM), 368 V maximum breakdown voltage (VBR), and 482 V clamping voltage (VC) at 0.62 A peak pulse current (IPPM), designed to protect power rails and signal lines in industrial power supplies and motor drive circuits.
For engineers reviewing the P4SMA350A-E3/61 datasheet, P4SMA350A-E3/61 pinout, P4SMA350A-E3/61 application, or P4SMA350A-E3/61 equivalent, this device delivers verified 400 W peak pulse power (10/1000 μs), low incremental surge resistance, AEC-Q101 qualification (B-grade), and UL 497B recognition - critical for high-reliability overvoltage protection in automotive and industrial environments.
Technical Context
The P4SMA350A-E3/61 operates as a unidirectional avalanche diode with cathode-band polarity marking, leveraging glass-passivated junction technology for stable breakdown behavior and fast response (<1 ns). Its thermal resistance (RθJA = 120 °C/W) and junction temperature limit (TJ max = 150 °C) define its derating envelope under repetitive surge conditions.
It complies with MSL Level 1 per J-STD-020 (peak reflow ≤ 260 °C), features matte tin-plated leads solderable per J-STD-002, and meets JESD201 Class 2 whisker resistance. The device is rated for 40 A non-repetitive forward surge (IFSM, 8.3 ms half-sine) and exhibits a +0.110 %/°C temperature coefficient of VBR.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 300 V - Maximum continuous reverse operating voltage before conduction begins; defines safe operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 333–368 V at IT = 1 mA - Verified avalanche onset range; ensures predictable turn-on during transients without premature leakage. |
| VC (Clamping Voltage) | 482 V at IPPM = 0.62 A (10/1000 μs) - Peak voltage seen by protected circuit during worst-case surge; determines downstream component stress. |
| PPPM (Peak Pulse Power) | 400 W - Sustained transient energy absorption capability under standard 10/1000 μs waveform; enables robust protection against lightning-induced surges. |
| ID (Reverse Leakage) | 1.0 μA at VWM - Ultra-low leakage preserves system efficiency and prevents false triggering in high-impedance sensing paths. |
| TJ max | 150 °C - Maximum junction temperature defining thermal design limits for PCB copper pad layout and ambient derating. |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with 5.0 mm × 5.0 mm copper pad requirement; supports automated placement and reflow compatibility. |
Pinout & Package
Package: SMA (DO-214AC), molded epoxy case meeting UL 94 V-0 flammability rating; cathode identified by band marking on unidirectional variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to lower-potential side of protected line; must be routed with low-inductance path to ground reference for effective clamping. |
| Cathode | Current exit terminal during reverse-biased clamping | Marked with band; connected to higher-potential rail (e.g., 300 V DC bus); determines polarity-sensitive placement in unidirectional protection schemes. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables protection against IEC 61000-4-5 Level 4 surges (4 kV line-to-ground) without degradation when mounted per recommended 5.0 mm × 5.0 mm copper pads. |
| AEC-Q101 qualified (B-grade) | Validated for automotive power electronics applications including engine control modules and battery management systems requiring extended temperature cycling and humidity reliability. |
| Glass passivated chip junction | Provides stable VBR tolerance (±5 %) and low leakage across -65 °C to +150 °C, eliminating parameter drift in harsh industrial environments. |
| UL 497B recognized (QVGQ2) | Confirms compliance for use in telecom and industrial communication interfaces where safety agency certification is mandatory for field deployment. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow profiles up to 260 °C peak, eliminating bake requirements and reducing manufacturing cost. |
Applications
| Industrial Power Supply Protection | Automotive DC-DC Converter Input |
|---|---|
|
Use Scenario: Suppresses switching transients and load-dump spikes on 300 V DC input rails of isolated AC/DC converters used in factory automation controllers. IC Role / Device Role / Timing Role: Unidirectional TVS placed between HV rail and chassis ground to clamp overvoltage events within 1 ns, limiting stress on primary-side MOSFETs and controller ICs. Use Value: Maintains system uptime by preventing cumulative gate oxide damage to 650 V Si MOSFETs during repeated 400 V/100 A surge events. |
Use Scenario: Protects 12 V–48 V DC-DC converter inputs in commercial vehicle telematics units exposed to ISO 7637-2 Pulse 5a (load dump). IC Role / Device Role / Timing Role: Clamps transient voltages above 350 V while maintaining <1 μA leakage at nominal 30 V operation, preserving low-quiescent-current sleep mode integrity. Use Value: Eliminates need for external series resistors or RC snubbers, reducing BOM count and PCB area in space-constrained automotive modules. |
| Motor Drive DC Bus Snubbing | Telecom Line Interface Protection |
|
Use Scenario: Installed across DC link capacitors in 3-phase inverter drives handling 30 kW motors, absorbing regenerative energy spikes during rapid deceleration. IC Role / Device Role / Timing Role: Acts as passive crowbar element that conducts only during >350 V excursions, diverting surge current away from IGBT gate drivers and current sensors. Use Value: Extends capacitor lifetime by limiting voltage overshoot to ≤482 V, avoiding dielectric stress beyond 80 % of rated 630 V capacitor voltage. |
Use Scenario: Shields RS-485 transceivers and Ethernet PHYs in outdoor base station cabinets from induced surges on long-wire data lines. IC Role / Device Role / Timing Role: Mounted at connector entry point with low-inductance ground path to suppress common-mode transients up to 4 kV (IEC 61000-4-5) without distorting 10 Mbps differential signals. Use Value: Achieves >99.9 % data link uptime in coastal deployments by preventing latch-up and permanent damage to 3.3 V logic-level interface ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ350A-E3/5A | Same VWM/VBR/VC specs but rated for 400 W PPPM with 5.0 mm × 5.0 mm pad layout; identical SMA package and RoHS compliance. | No functional difference; differs only in tape-and-reel packaging (7500 pcs vs. 1800 pcs) and minor MSL handling documentation. | Select SMAJ350A-E3/5A for high-volume production runs requiring larger reel quantities and same electrical performance. |
| 1.5KE350A | Through-hole DO-201 package; 400 W PPPM, VWM = 300 V, VC = 482 V - electrically matched but incompatible footprint and thermal profile (RθJA = 150 °C/W). | Requires PCB redesign; unsuitable for automated SMT lines; preferred only where mechanical ruggedness or manual repairability is prioritized over density. | Choose 1.5KE350A only for legacy through-hole designs or prototyping where rework access outweighs assembly efficiency. |
Compared with SMAJ350A-E3/5A, P4SMA350A-E3/61 offers identical protection performance in a smaller footprint and tighter thermal resistance, while 1.5KE350A trades mountability for higher mechanical robustness - making P4SMA350A-E3/61 optimal for space-constrained, high-density industrial and automotive PCBs.
Availability
P4SMA350A-E3/61 is available at Aetrix Electronics and suitable for industrial power supply protection, automotive DC-DC converter input stages, and motor drive DC bus snubbing requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for P4SMA350A-E3/61 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, and protection devices with emphasis on reliability, precision, and automotive-grade qualification.
The P4SMA Series targets high-voltage transient suppression in compact SMT form factors, engineered specifically for industrial, automotive, and telecom applications demanding AEC-Q101 compliance and UL safety recognition.
FAQ
What is the maximum clamping voltage of the P4SMA350A-E3/61 under standard surge conditions?
The P4SMA350A-E3/61 has a maximum clamping voltage (VC) of 482 V when subjected to a 10/1000 μs waveform at 0.62 A peak pulse current (IPPM). This value is measured per Figure 1 in Vishay Document 88367 and defines the upper voltage limit imposed on protected circuitry during transient events. The P4SMA350A-E3/61 maintains this clamping performance across its specified operating temperature range (-65 °C to +150 °C) with minimal variation due to its glass-passivated junction.
Is the P4SMA350A-E3/61 suitable for automotive applications?
Yes, the P4SMA350A-E3/61 is AEC-Q101 qualified (Grade B) per Vishay's ordering information note indicating "_B" suffix variants for P4SMA250A to P4SMA540A. It meets automotive reliability requirements including temperature cycling, humidity testing, and mechanical shock. The P4SMA350A-E3/61 is explicitly recommended for DC-DC converter inputs and ECU power rails where 300 V standoff and 482 V clamping are required, and it carries UL 497B recognition for safety-critical deployments.
What is the thermal resistance and how does it affect PCB layout for the P4SMA350A-E3/61?
The P4SMA350A-E3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on the minimum recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value directly governs allowable power dissipation: at 25 °C ambient, the device can sustain 3.3 W continuously, but derates linearly above 25 °C. To maintain reliability, PCB layout must allocate sufficient copper area and avoid thermal isolation - undersized pads increase junction temperature and accelerate parametric shift in VBR and leakage.
Does the P4SMA350A-E3/61 have polarity marking, and how is it oriented in circuit?
Yes, the P4SMA350A-E3/61 is unidirectional and features a cathode band marking on the SMA (DO-214AC) package body. During normal operation, the cathode connects to the higher-potential node (e.g., 300 V DC bus), and the anode connects to ground or lower-potential return. This orientation ensures reverse-biased operation under steady state and rapid avalanche conduction during overvoltage events. Incorrect polarity results in forward conduction and catastrophic failure under nominal voltage.
What is the peak forward surge current rating for the P4SMA350A-E3/61?
The P4SMA350A-E3/61 is rated for a non-repetitive peak forward surge current (IFSM) of 40 A at 8.3 ms single half-sine wave, per Maximum Ratings Table in Vishay Document 88367. This rating applies only to forward-biased conduction - such as during inadvertent reverse connection or fault conditions - and is not intended for regular operation. The P4SMA350A-E3/61 must be operated in reverse-bias for TVS functionality; exceeding IFSM risks metallization lift-off or bond wire fusing.
P4SMA350A-E3/61 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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 300V
- Voltage - Breakdown (Min):
- 333V
- Voltage - Clamping (Max) @ Ipp:
- 482V
- Current - Peak Pulse (10/1000µs):
- 620mA
- Power - Peak Pulse:
- 300W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
P4SMA350A-E3/61 FAQ
1.How can I place an order for P4SMA350A-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA350A-E3/61 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 P4SMA350A-E3/61 reliable?
The price and inventory of P4SMA350A-E3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA350A-E3/61 is usually 5 days.
3.What payment methods are accepted for P4SMA350A-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA350A-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA350A-E3/61?
P4SMA350A-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA350A-E3/61 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 P4SMA350A-E3/61?
For technical support, including P4SMA350A-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA350A-E3/61 requirements.
6.How does Aetrix verify that P4SMA350A-E3/61 is sourced from the original manufacturer or authorized distributors?
All P4SMA350A-E3/61 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 P4SMA350A-E3/61 meets industry standards.
7.What is the process for return or replacement of P4SMA350A-E3/61?
All P4SMA350A-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA350A-E3/61, 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 P4SMA350A-E3/61 part is unused and in its original packaging.
Return procedure for P4SMA350A-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P4SMA350A-E3/61 Tags
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