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Vishay General Semiconductor - Diodes Division P4SMA39AHM3/H
- Part No.:
- P4SMA39AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA39AHM3/H.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,272
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Product details
Overview
P4SMA39AHM3/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, rated for 39 V breakdown voltage (VBR = 37.1–41.0 V at IT = 1.0 mA), 53.9 V maximum clamping voltage (VC) at 7.4 A peak pulse current, and 400 W peak pulse power (10/1000 µs waveform). It protects MOSFETs, ICs, and sensor signal lines against inductive switching transients and lightning surges in industrial and automotive electronics.
For engineers reviewing the P4SMA39AHM3/H datasheet, P4SMA39AHM3/H pinout, P4SMA39AHM3/H application, or P4SMA39AHM3/H equivalent, this device delivers AEC-Q101 qualification, halogen-free RoHS compliance, MSL Level 1 moisture sensitivity, and verified clamping performance under repetitive 0.01% duty cycle conditions - critical for automotive-grade ESD and surge protection design.
Technical Context
This unidirectional TVS operates with a cathode-band polarity marking and uses a glass-passivated silicon junction to achieve fast response time (<1 ns) and low incremental surge resistance. Its thermal resistance is RθJA = 120 °C/W (typ.) and RθJL = 30 °C/W (typ.), enabling reliable operation up to TJ = +150 °C.
The device meets UL 497B recognition (QVGQ2) and supports automated SMT placement on standard 0.2" × 0.2" copper pads. It is rated for 40 A non-repetitive forward surge current (8.3 ms half-sine) and exhibits a VWM = 33.3 V with only 1.0 µA maximum reverse leakage at that voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 37.1 V / 41.0 V at IT = 1.0 mA - defines precise breakdown threshold for accurate overvoltage triggering |
| VWM | 33.3 V - maximum continuous reverse working voltage before leakage exceeds 1.0 µA |
| VC @ IPPM | 53.9 V at 7.4 A - clamping voltage during 10/1000 µs transient, limiting downstream voltage stress |
| PPPM | 400 W - peak pulse power handling capability under standardized surge waveform |
| IFSM | 40 A - surge current rating for 8.3 ms half-sine wave, supporting high-energy inductive kick protection |
| TJ max. | +150 °C - maximum junction temperature enabling use in under-hood automotive environments |
| Package | SMA (DO-214AC) - industry-standard surface-mount outline with 0.208" length and matte tin-plated leads |
Pinout & Package
SMA (DO-214AC) package: molded epoxy case meeting UL 94 V-0 flammability rating; cathode indicated by band; terminals are matte tin plated, solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or low-side reference in unidirectional TVS configuration |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., signal or power rail); band-marked end for orientation identification |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS sensor interfaces |
| Halogen-free & RoHS-compliant | Meets environmental compliance requirements for modern industrial and automotive PCB assemblies |
| MSL Level 1 (260 °C peak) | Enables standard reflow soldering without pre-baking or special handling |
| 400 W peak pulse power (10/1000 µs) | Provides robust protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 12 V systems |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes voltage overshoot during transient events, reducing risk of downstream IC damage |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS placed between signal line and ground to clamp transients before they reach the transceiver input stage. Use Value: Clamps 39 V nominal line to ≤53.9 V during 7.4 A surge, preserving signal integrity and preventing latch-up in AEC-Q100 qualified ICs. |
Use Scenario: Safeguarding digital input modules in programmable logic controllers exposed to relay coil flyback and motor drive noise. IC Role / Device Role / Timing Role: Standoff-rated TVS on 24 V DC input channels to absorb repetitive 400 W surges without degradation. Use Value: Maintains 33.3 V working voltage margin while delivering 400 W pulse handling - compatible with IEC 61000-4-4 EFT immunity testing. |
| Telecom Power Rail Protection | Consumer Device USB Port Protection |
Use Scenario: Shielding 48 V PoE-powered Ethernet switch ports from induced lightning surges and hot-swap transients. IC Role / Device Role / Timing Role: Primary clamping device on DC input rail upstream of DC-DC converters and PHY ICs. Use Value: Withstands 40 A surge current (8.3 ms) and maintains stable VBR across -65 °C to +150 °C, ensuring reliability in outdoor telecom cabinets. |
Use Scenario: Adding secondary-level surge suppression on USB VBUS lines in portable monitors and docking stations. IC Role / Device Role / Timing Role: Low-capacitance unidirectional TVS placed between VBUS and chassis ground to suppress contact ESD and cable discharge events. Use Value: Delivers <1 µA leakage at 33.3 V, avoiding standby power drain while clamping 8 kV HBM ESD to safe levels per IEC 61000-4-2. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ39A | Same VBR range (37.1–41.0 V), but rated for 400 W with 1.0 mA test current and lacks AEC-Q101 qualification | Commercial-grade only; not validated for automotive temperature cycling or humidity testing | Select when AEC-Q101 is not required and cost optimization is prioritized over automotive qualification |
| 1.5SMC39A | Higher package thermal mass (SMC/DO-214AB), 1.5 kW peak power rating, and 33.3 V VWM, but larger footprint and lower mounting density | Better suited for high-energy industrial mains protection where board space permits larger devices | Choose for applications requiring >400 W pulse handling or improved thermal dissipation on large copper planes |
Compared with SMAJ39A and 1.5SMC39A, the P4SMA39AHM3/H uniquely combines AEC-Q101 qualification, halogen-free construction, and compact SMA packaging - making it the preferred choice for space-constrained automotive and industrial designs requiring certified reliability.
Availability
P4SMA39AHM3/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom power rails, and consumer USB port protection requiring stable component supply and long-term lifecycle support.
Supply support for P4SMA39AHM3/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, and protection devices with emphasis on reliability, efficiency, and application-specific validation.
The P4SMA Series targets high-reliability transient suppression in automotive, industrial, and telecom systems, designed to meet stringent AEC-Q101, UL 497B, and JEDEC moisture sensitivity requirements.
FAQ
What is the clamping voltage of the P4SMA39AHM3/H under a 10/1000 µs surge?
The P4SMA39AHM3/H has a maximum clamping voltage (VC) of 53.9 V at 7.4 A peak pulse current under the standardized 10/1000 µs waveform. This value is measured per Figure 1 in the Vishay datasheet 88367 and reflects the actual voltage seen by downstream circuitry during transient events - critical for ensuring protected ICs remain within absolute maximum ratings. The P4SMA39AHM3/H achieves this with a clamping ratio of approximately 1.38 relative to its VBR midpoint.
Is the P4SMA39AHM3/H suitable for automotive applications?
Yes, the P4SMA39AHM3/H is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant, and automotive-grade construction. It is specifically validated for temperature cycling, humidity testing, and mechanical shock per AEC-Q101 standards, making it appropriate for engine control, body electronics, and ADAS sensor protection. The P4SMA39AHM3/H also meets UL 497B recognition for telecom and industrial safety compliance.
What does the "HM3" suffix mean in P4SMA39AHM3/H?
The "HM3" suffix in P4SMA39AHM3/H denotes halogen-free, RoHS-compliant, and AEC-Q101 qualified construction, with "H" specifying 7-inch tape-and-reel packaging (1800 units per reel). This distinguishes it from commercial-grade variants like E3 or M3, and confirms full automotive qualification - including extended temperature operation (-65 °C to +150 °C), moisture sensitivity level 1, and whisker resistance per JESD 201 Class 2. The P4SMA39AHM3/H is built for high-reliability deployment in harsh environments.
How does the P4SMA39AHM3/H compare to bidirectional TVS diodes?
The P4SMA39AHM3/H is unidirectional and intended for DC line protection where polarity is fixed - such as 12 V/24 V automotive rails or USB VBUS. Unlike bidirectional types (e.g., P4SMA39CHM3/H), it blocks reverse current until breakdown occurs, offering lower leakage (<1.0 µA at VWM) and higher surge current capability in one direction. The P4SMA39AHM3/H cannot replace bidirectional devices in AC-coupled or floating signal paths without circuit redesign.
What is the thermal resistance of the P4SMA39AHM3/H?
The P4SMA39AHM3/H has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead resistance (RθJL) of 30 °C/W, measured on minimum recommended pad layout (0.2" × 0.2" copper). These values define its ability to dissipate transient energy without exceeding TJ = +150 °C. For sustained power dissipation, derating per Figure 2 in datasheet 88367 applies - the P4SMA39AHM3/H is optimized for short-duration surges, not continuous DC power handling.
P4SMA39AHM3/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):
- 33.3V
- Voltage - Breakdown (Min):
- 37.1V
- Voltage - Clamping (Max) @ Ipp:
- 53.9V
- Current - Peak Pulse (10/1000µs):
- 7.4A
- 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)
P4SMA39AHM3/H FAQ
1.How can I place an order for P4SMA39AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA39AHM3/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 P4SMA39AHM3/H reliable?
The price and inventory of P4SMA39AHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA39AHM3/H is usually 5 days.
3.What payment methods are accepted for P4SMA39AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA39AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA39AHM3/H?
P4SMA39AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA39AHM3/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 P4SMA39AHM3/H?
For technical support, including P4SMA39AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA39AHM3/H requirements.
6.How does Aetrix verify that P4SMA39AHM3/H is sourced from the original manufacturer or authorized distributors?
All P4SMA39AHM3/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 P4SMA39AHM3/H meets industry standards.
7.What is the process for return or replacement of P4SMA39AHM3/H?
All P4SMA39AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA39AHM3/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 P4SMA39AHM3/H part is unused and in its original packaging.
Return procedure for P4SMA39AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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