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Vishay General Semiconductor - Diodes Division P4SMA300AHM3_B/I
- Part No.:
- P4SMA300AHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA300AHM3_B/I.pdf
- Description:
- TVS DIODE 256VWM 414VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
P4SMA300AHM3_B/I from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, rated for 300 V standoff voltage (VWM), 315 V maximum breakdown voltage (VBR), and 400 W peak pulse power (10/1000 µs). It clamps transients to 414 V at 0.73 A peak pulse current and is AEC-Q101 qualified for automotive electronics protection.
For engineers reviewing the P4SMA300AHM3_B/I datasheet, P4SMA300AHM3_B/I pinout, P4SMA300AHM3_B/I application, or P4SMA300AHM3_B/I equivalent, this device serves as a robust, low-profile overvoltage clamp for high-voltage DC rails in automotive power systems, industrial sensor interfaces, and telecom line protection where reliability under repetitive surge stress and halogen-free compliance are required.
Technical Context
The P4SMA300AHM3_B/I operates as a unidirectional avalanche diode with glass-passivated junction, delivering fast response (<1 ns) and low incremental surge resistance to suppress transient energy before downstream ICs or MOSFETs are damaged. Its 300 V VWM supports use on 277 VAC-derived DC bus lines and 300 V nominal battery systems.
Designed for mounting on 0.2" × 0.2" copper pads, it achieves 400 W peak pulse power (derated to 300 W above 91 V) and handles 40 A non-repetitive forward surge current (8.3 ms half-sine). Thermal resistance is 120 °C/W junction-to-ambient, with max operating junction temperature of +150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 300 V - Maximum continuous reverse voltage before conduction begins; sets operating margin for 277 VAC-derived 380 VDC rails. |
| VBR (Breakdown Voltage) | 285–315 V at 1 mA - Confirmed avalanche onset range; ensures predictable clamping initiation under ESD or lightning-induced surges. |
| VC (Clamping Voltage) | 414 V at IPPM = 0.73 A (10/1000 µs) - Actual voltage seen by protected circuit during worst-case transient; defines safe margin for 400 V-rated components. |
| PPPM (Peak Pulse Power) | 400 W - Sustains single 10/1000 µs transients per JEDEC standards; derates to 300 W above 91 V per spec. |
| ID (Reverse Leakage) | 1.0 µA at VWM - Negligible standby current; avoids loading high-impedance sensor bias networks or battery-powered circuits. |
| TJ max | +150 °C - Enables operation in under-hood automotive environments and enclosed industrial enclosures without forced cooling. |
| Package | SMA (DO-214AC) - Surface-mount, low-profile (2.54 mm height), RoHS-compliant, halogen-free, MSL Level 1 (260 °C reflow). |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, cathode indicated by band marking. Dimensions: 4.50 mm × 2.79 mm × 2.29 mm (L × W × H); 0.2" × 0.2" copper pad layout recommended per datasheet fig. 6.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to system ground or low-side reference; enables unidirectional clamping from rail to GND. |
| Cathode | Current exit point during reverse breakdown | Connected to protected line (e.g., 300 V DC bus); absorbs positive transients toward ground. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, humidity, and mechanical shock per JESD22 standards. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets IEC 61249-2-21 and JEDEC J-STD-609A Class 1 requirements; suitable for green manufacturing and export compliance. |
| 400 W peak pulse power (10/1000 µs) | Handles IEC 61000-4-5 Level 4 surges (4 kV line-earth) on high-voltage DC distribution without degradation. |
| Glass passivated junction | Ensures stable VBR over lifetime and immunity to moisture-induced parameter drift in humid environments. |
| Low profile (2.29 mm height) | Enables placement in space-constrained modules such as EV battery management units and telecom rectifier cards. |
Applications
| Automotive Battery Management | Industrial 277 VAC Lighting Control |
|---|---|
|
Use Scenario: Protection of MCU inputs and gate drivers on 300–400 V DC bus derived from 277 VAC or 400 V battery packs in EV charging modules and BMS boards. IC Role / Device Role: Unidirectional TVS clamp placed between HV rail and ground to shunt surge energy away from sensitive analog front-ends and isolated gate drivers. Use Value: Clamps 414 V at 0.73 A, preserving 400 V-rated SiC MOSFETs and ADC reference stability during load dump or ISO 7637-2 pulse 5a events. |
Use Scenario: Overvoltage suppression on secondary-side DC outputs of LED drivers powering commercial high-bay fixtures operating from 277 VAC mains. IC Role / Device Role: Standoff-rated TVS on 300 V output rail to absorb switching transients from magnetic ballasts or relay contact bounce. Use Value: 300 V VWM provides 10 % margin above nominal 277 VAC-derived DC, while 400 W rating withstands repetitive 10/1000 µs surges common in industrial lighting environments. |
| Telecom Power Supply Input | Renewable Energy Inverter DC Link |
|
Use Scenario: Input-stage transient protection on 300 V DC input of PoE++ midspans or telecom rectifiers exposed to induced lightning surges on long cable runs. IC Role / Device Role: First-line unidirectional clamp on primary DC input, coordinated with upstream MOVs and downstream filtering. Use Value: Fast <1 ns response captures early transient rise time; 1 µA leakage avoids degrading efficiency in always-on telecom systems. |
Use Scenario: DC link protection in solar microinverters and string inverters where PV array open-circuit voltage reaches 300–400 V under cold conditions. IC Role / Device Role: Rail-to-ground TVS on DC link capacitor bank to limit overvoltage during rapid MPPT transients or grid fault recovery. Use Value: AEC-Q101 qualification ensures long-term reliability under thermal cycling in outdoor enclosures; halogen-free construction meets IEC 61215 environmental requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ300A-E3/52 (Vishay) | Same VWM/VBR/VC specs but SMB (DO-214AA) package; 50 % larger footprint, 150 °C TJ max, no AEC-Q101 or halogen-free certification. | Preferred for non-automotive industrial designs where board space allows larger package and RoHS-only compliance suffices. | Select when higher thermal mass is needed and AEC-Q101/halogen-free are not mandated. |
| 1.5SMC300A (ON Semiconductor) | Identical electrical specs (300 V VWM, 414 V VC), same SMA package, but only RoHS-compliant (not halogen-free) and not AEC-Q101 qualified. | Suitable for commercial telecom and computing applications where automotive qualification is unnecessary. | Choose for cost-sensitive non-automotive designs requiring identical clamping performance without HM3-level compliance. |
Compared with P4SMA300AHM3_B/I, SMBJ300A-E3/52 offers greater thermal mass but lacks automotive qualification and halogen-free status, while 1.5SMC300A matches clamping behavior but omits AEC-Q101 and halogen-free assurance-making P4SMA300AHM3_B/I the sole option meeting all three: high-voltage clamping, automotive reliability, and green materials compliance.
Availability
P4SMA300AHM3_B/I is available at Aetrix Electronics and suitable for automotive battery management, industrial 277 VAC lighting control, and telecom power supply input applications requiring stable component supply, halogen-free compliance, and AEC-Q101 validation.
Supply support for P4SMA300AHM3_B/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, precision, and application-specific optimization.
The P4SMA Series targets high-reliability transient suppression in automotive, industrial, and telecom systems, designed specifically for surface-mount compatibility, automated assembly, and robust surge handling in harsh environments.
FAQ
What is the maximum clamping voltage of the P4SMA300AHM3_B/I under standard test conditions?
The P4SMA300AHM3_B/I has a maximum clamping voltage (VC) of 414 V when subjected to a 10/1000 µs waveform at its rated peak pulse current of 0.73 A. This value is measured per JEDEC standards and defines the upper voltage limit imposed on protected circuitry during transient events. The P4SMA300AHM3_B/I maintains this clamping performance across its full operating temperature range and after repeated surge exposure, provided derating guidelines are followed.
Is the P4SMA300AHM3_B/I suitable for automotive applications?
Yes, the P4SMA300AHM3_B/I is AEC-Q101 qualified and carries the HM3 suffix, indicating halogen-free, RoHS-compliant, and automotive-grade reliability. It undergoes rigorous stress testing-including temperature cycling, humidity, and mechanical shock-to meet automotive electronic module requirements. The P4SMA300AHM3_B/I is explicitly intended for under-hood and battery-system applications where sustained operation up to +150 °C and long-term surge endurance are mandatory.
What does the "B/I" suffix in P4SMA300AHM3_B/I indicate?
The "B" denotes AEC-Q101 qualification for the 250–540 V voltage range (per datasheet note 2), and the "I" specifies 7500-unit reel packaging in 13-inch diameter tape. The "HM3" portion confirms halogen-free, RoHS-compliant construction. Therefore, P4SMA300AHM3_B/I is the full ordering code for an AEC-Q101-qualified, halogen-free, unidirectional 300 V TVS diode supplied in bulk 7500-piece reels.
How does the P4SMA300AHM3_B/I compare to bidirectional TVS diodes?
The P4SMA300AHM3_B/I is unidirectional and functions only for positive transients relative to ground-ideal for DC rail protection where polarity is fixed. Bidirectional variants (e.g., P4SMA300CA) protect both polarities but exhibit higher capacitance and lower VWM for the same VBR. The P4SMA300AHM3_B/I's unidirectional architecture delivers tighter leakage control (1.0 µA), faster response, and superior clamping consistency on high-voltage DC systems like EV battery stacks or telecom rectifiers.
What is the thermal resistance of the P4SMA300AHM3_B/I, and how does it affect PCB layout?
The P4SMA300AHM3_B/I has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on the recommended 0.2" × 0.2" copper pads per terminal. To maintain safe junction temperatures below +150 °C under 3.3 W steady-state dissipation, designers must ensure adequate copper area and avoid thermal bottlenecks. The P4SMA300AHM3_B/I's RθJL of 30 °C/W also supports heat conduction through leads into internal ground planes, making thermal via placement beneath terminals beneficial in high-power surge scenarios.
P4SMA300AHM3_B/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:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 256V
- Voltage - Breakdown (Min):
- 285V
- Voltage - Clamping (Max) @ Ipp:
- 414V
- Current - Peak Pulse (10/1000µs):
- 730mA
- 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)
P4SMA300AHM3_B/I FAQ
1.How can I place an order for P4SMA300AHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA300AHM3_B/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 P4SMA300AHM3_B/I reliable?
The price and inventory of P4SMA300AHM3_B/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA300AHM3_B/I is usually 5 days.
3.What payment methods are accepted for P4SMA300AHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA300AHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA300AHM3_B/I?
P4SMA300AHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA300AHM3_B/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 P4SMA300AHM3_B/I?
For technical support, including P4SMA300AHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA300AHM3_B/I requirements.
6.How does Aetrix verify that P4SMA300AHM3_B/I is sourced from the original manufacturer or authorized distributors?
All P4SMA300AHM3_B/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 P4SMA300AHM3_B/I meets industry standards.
7.What is the process for return or replacement of P4SMA300AHM3_B/I?
All P4SMA300AHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA300AHM3_B/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 P4SMA300AHM3_B/I part is unused and in its original packaging.
Return procedure for P4SMA300AHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P4SMA300AHM3_B/I Tags
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