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Vishay General Semiconductor - Diodes Division P4SMA51AHM3/H
- Part No.:
- P4SMA51AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA51AHM3/H.pdf
- Description:
- TVS DIODE 43.6VWM 70.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,927
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Product details
Overview
P4SMA51AHM3/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection in power and signal lines. It features a 51 V breakdown voltage (VBR = 48.5–53.6 V at 1 mA), 43.6 V maximum standoff voltage (VWM), 70.1 V clamping voltage (VC) at 5.7 A peak pulse current, and 400 W peak pulse power rating with 10/1000 µs waveform - used to safeguard MOSFETs, ICs, and sensor interfaces against inductive switching transients and ESD in industrial and automotive electronics.
For engineers reviewing the P4SMA51AHM3/H datasheet, P4SMA51AHM3/H pinout, P4SMA51AHM3/H application, or P4SMA51AHM3/H equivalent, this device delivers AEC-Q101 qualification, halogen-free RoHS compliance, MSL Level 1 moisture sensitivity, and verified clamping performance under repetitive surge conditions - critical for automotive-grade board-level protection design and long-term reliability validation.
Technical Context
The P4SMA51AHM3/H operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its specified breakdown threshold. Its glass-passivated junction ensures stable VBR tolerance (±5%), low incremental surge resistance, and fast response time (<1 ns), enabling effective suppression of sub-microsecond transients induced by relay switching or motor commutation.
Thermally, it exhibits RθJA = 120 °C/W and RθJL = 30 °C/W, with a maximum junction temperature of 150 °C and 3.3 W steady-state power dissipation on infinite heatsink at 50 °C ambient. Its SMA (DO-214AC) package supports automated placement and meets UL 94 V-0 flammability requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 48.5 V / 53.6 V at 1 mA - defines precise avalanche onset range for reliable triggering without false conduction |
| VWM | 43.6 V - maximum continuous reverse operating voltage before leakage exceeds 1 µA |
| VC @ IPPM | 70.1 V at 5.7 A - clamping voltage during 10/1000 µs surge, limiting protected circuit stress |
| PPPM | 400 W - peak transient power handling capability under standard waveform, derated above 25 °C |
| IFSM | 40 A - single half-sine surge current rating (8.3 ms), supporting high-energy fault events |
| TJ max | 150 °C - maximum junction temperature, enabling operation in under-hood automotive environments |
| Package | SMA (DO-214AC) - industry-standard surface-mount outline with 5.0 mm × 5.0 mm copper pad thermal requirement |
Pinout & Package
SMA (DO-214AC) package: molded plastic case with matte tin-plated leads, cathode indicated by band marking; dimensions: 4.93 mm × 3.99 mm × 2.29 mm (L × W × H); compliant with J-STD-002 and JESD 22-B102 solderability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or lower-potential rail in unidirectional TVS configuration |
| Cathode | Avalanche conduction terminal | Connected to protected line; conducts reverse surge current to ground when VRM exceeded |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics |
| Halogen-free & RoHS-compliant | Meets environmental compliance requirements for modern industrial and consumer electronics |
| 400 W peak pulse power (10/1000 µs) | Withstands repeated transient energy surges without degradation in automotive and industrial settings |
| MSL Level 1 (260 °C peak reflow) | Enables standard lead-free SMT assembly without moisture-related popcorning risk |
| Glass-passivated junction | Ensures stable electrical parameters and long-term reliability under thermal cycling |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp spikes up to ±100 V. Use Value: Limits voltage seen by downstream regulators and microcontrollers to ≤70.1 V during 400 W surges, preventing latch-up or permanent damage. |
Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance TVS connected across differential signal pair to shunt fast transients before reaching ADC input. Use Value: Clamps 8 kV contact ESD pulses within <1 ns while maintaining signal integrity due to minimal parasitic capacitance. |
| Telecom DC Power Input Protection | Consumer Device USB Port Protection |
|
Use Scenario: Safeguarding PoE-powered equipment inputs against lightning-induced surges on 48 V DC lines. IC Role / Device Role / Timing Role: Primary TVS stage upstream of DC-DC converter, absorbing bulk surge energy before secondary protection. Use Value: Handles 5.7 A peak pulse current at 70.1 V clamping, reducing stress on downstream TVS arrays and enabling smaller secondary components. |
Use Scenario: Preventing ESD damage to USB data lines and VBUS in portable audio/video devices. IC Role / Device Role / Timing Role: Unidirectional TVS on VBUS line to suppress positive-going transients from hot-plug or charger faults. Use Value: Withstands 40 A surge (8.3 ms) and maintains 43.6 V standoff, ensuring no false triggering during normal 5 V operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51A | Higher 600 W PPPM, larger SMB (DO-214AA) package, same VBR range (48.5–53.6 V) | Requires larger PCB footprint; better suited for higher-energy industrial surge standards (IEC 61000-4-5) | Select SMBJ51A when >400 W surge margin is required and board space allows SMB outline |
| 1.5SMC51A | Same VBR/VC, 1500 W PPPM, much larger SMC (DO-214AB) package, higher IPPM (32.4 A) | Designed for primary-level AC/DC front-end protection; not suitable for dense SMT layouts | Choose 1.5SMC51A only for high-power mains-input protection where SMA density is insufficient |
Compared with SMBJ51A and 1.5SMC51A, the P4SMA51AHM3/H offers optimal balance of 400 W surge capability, compact SMA footprint, and AEC-Q101 qualification - making it the preferred choice for space-constrained automotive and industrial modules requiring certified reliability without over-engineering.
Availability
P4SMA51AHM3/H is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, telecom power supplies, and consumer USB power delivery systems requiring stable component supply, halogen-free compliance, and AEC-Q101 assurance.
Supply support for P4SMA51AHM3/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-reliability surface-mount transient suppression in automotive, industrial, and communications systems - delivering consistent clamping performance, AEC-Q101 qualification, and scalable voltage coverage from 6.8 V to 540 V.
FAQ
What is the clamping voltage of the P4SMA51AHM3/H under maximum surge conditions?
The P4SMA51AHM3/H has a maximum clamping voltage (VC) of 70.1 V at 5.7 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured per standard test conditions and defines the upper voltage limit imposed on protected circuits during transient events. The P4SMA51AHM3/H maintains this clamping performance consistently across its rated temperature range and lifetime, supporting robust design margins for 48 V and 12 V automotive systems.
Is the P4SMA51AHM3/H suitable for automotive applications?
Yes, the P4SMA51AHM3/H is AEC-Q101 qualified and specifically designated for automotive use with the "HM3" suffix indicating halogen-free, RoHS-compliant, and automotive-grade construction. It operates reliably from –65 °C to +150 °C and meets MSL Level 1 reflow requirements, making the P4SMA51AHM3/H appropriate for engine control units, body control modules, and ADAS sensor interfaces exposed to harsh thermal and mechanical environments.
How does the P4SMA51AHM3/H differ from bidirectional TVS diodes like P4SMA51CA?
The P4SMA51AHM3/H is unidirectional and conducts only in reverse bias above its breakdown voltage, while P4SMA51CA is bidirectional and protects against both polarities. The P4SMA51AHM3/H offers lower leakage at VWM (1 µA vs. 10 µA for CA types) and is optimized for DC power rail protection where polarity is fixed. Use the P4SMA51AHM3/H when protecting single-polarity lines such as 12 V battery feeds or regulated 5 V supplies.
What is the standoff voltage rating for the P4SMA51AHM3/H?
The P4SMA51AHM3/H has a maximum working peak reverse voltage (VWM) of 43.6 V, meaning it remains non-conductive with leakage current ≤1 µA up to this DC or RMS voltage level. This rating ensures compatibility with 36 V nominal systems and provides adequate margin below the 48.5 V minimum breakdown voltage. Designers must ensure continuous operating voltage stays at or below 43.6 V to prevent premature conduction or accelerated aging of the P4SMA51AHM3/H.
Does the P4SMA51AHM3/H require special PCB layout considerations?
Yes - the P4SMA51AHM3/H should be mounted on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve rated 400 W pulse power and thermal performance. Short, low-inductance traces to ground are essential to minimize clamping overshoot during fast transients. Avoid routing sensitive signals near the P4SMA51AHM3/H anode/cathode paths, and ensure the cathode band orientation matches schematic polarity to prevent reverse installation. These practices directly impact the real-world surge suppression efficacy of the P4SMA51AHM3/H.
P4SMA51AHM3/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:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 43.6V
- Voltage - Breakdown (Min):
- 48.5V
- Voltage - Clamping (Max) @ Ipp:
- 70.1V
- Current - Peak Pulse (10/1000µs):
- 5.7A
- 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)
P4SMA51AHM3/H FAQ
1.How can I place an order for P4SMA51AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA51AHM3/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 P4SMA51AHM3/H reliable?
The price and inventory of P4SMA51AHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA51AHM3/H is usually 5 days.
3.What payment methods are accepted for P4SMA51AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA51AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA51AHM3/H?
P4SMA51AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA51AHM3/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 P4SMA51AHM3/H?
For technical support, including P4SMA51AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA51AHM3/H requirements.
6.How does Aetrix verify that P4SMA51AHM3/H is sourced from the original manufacturer or authorized distributors?
All P4SMA51AHM3/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 P4SMA51AHM3/H meets industry standards.
7.What is the process for return or replacement of P4SMA51AHM3/H?
All P4SMA51AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA51AHM3/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 P4SMA51AHM3/H part is unused and in its original packaging.
Return procedure for P4SMA51AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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