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Vishay General Semiconductor - Diodes Division P4SMA39AHM3_A/I
- Part No.:
- P4SMA39AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA39AHM3_A/I.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,754
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Product details
Overview
P4SMA39AHM3_A/I 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 1 mA), 33.3 V standoff voltage (VWM), and 53.9 V clamping voltage (VC) at 7.4 A peak pulse current (IPPM). It delivers 400 W peak pulse power (10/1000 µs waveform), supports automotive-grade reliability per AEC-Q101, and protects MOSFETs and sensor signal lines in industrial power supplies.
For engineers reviewing the P4SMA39AHM3_A/I datasheet, P4SMA39AHM3_A/I pinout, P4SMA39AHM3_A/I application, or P4SMA39AHM3_A/I equivalent, this page provides verified electrical parameters, thermal derating behavior, clamping performance under surge conditions, AEC-Q101 qualification status, and direct alternatives with documented VBR, VC, and IPPM alignment.
Technical Context
The P4SMA39AHM3_A/I operates as a unidirectional avalanche-clamping device with glass-passivated junction, enabling sub-nanosecond response to transients. Its 120 °C/W junction-to-ambient thermal resistance (RθJA) and 30 °C/W junction-to-lead (RθJL) define thermal limits under repetitive surge duty cycles.
Designed for 10/1000 µs waveform compliance, it sustains 400 W peak pulse power up to TA = 25 °C, derating linearly above that temperature per Figure 2. The cathode-band polarity marking enables correct PCB orientation during automated placement on 5.0 mm × 5.0 mm copper pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 37.1 V / 41.0 V at IT = 1 mA - defines minimum and maximum guaranteed avalanche initiation threshold |
| VWM | 33.3 V - maximum continuous reverse working voltage before leakage exceeds 1 µA |
| VC @ IPPM | 53.9 V at 7.4 A - clamped voltage seen by protected circuit during full-rated transient event |
| PPPM | 400 W (10/1000 µs) - peak surge energy absorption capability without failure |
| IPPM | 7.4 A - maximum non-repetitive surge current the device safely clamps |
| TJ max. | +150 °C - absolute maximum junction temperature for reliable long-term operation |
| Package | SMA (DO-214AC) - industry-standard surface-mount outline with 5.28 mm length, 4.50 mm width, 2.29 mm height |
Pinout & Package
SMA (DO-214AC) package with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102; cathode identified by band marking on unidirectional variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; connected to system ground or low-side reference in TVS configuration | Provides return path for surge current during clamping; must be routed with low-inductance trace to minimize VL overshoot |
| Cathode | Current exit point in forward bias; connected to protected line (e.g., 39 V rail or sensor input) | Defines polarity-sensitive connection-reverse connection disables clamping function and risks catastrophic failure |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including temperature cycling, HTRB, and ESD |
| 400 W peak pulse power | Withstands IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) without degradation when mounted on 5.0 mm × 5.0 mm pads |
| Low incremental surge resistance | Enables tight VC/VBR ratio of 1.45, minimizing overvoltage stress on downstream ICs during clamping |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without preconditioning or dry-pack requirements |
| Glass passivated junction | Ensures stable VBR tolerance and low leakage (<1 µA at VWM) across -65 °C to +150 °C operating range |
Applications
| Industrial Power Supply Protection | Automotive Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 36 V DC input rails in programmable logic controllers against inductive switching spikes from solenoid drivers. IC Role / Device Role / Timing Role: Unidirectional TVS placed between rail and chassis ground to clamp positive transients exceeding 33.3 V. Use Value: Limits voltage excursion to ≤53.9 V during 7.4 A surges, preventing latch-up in upstream DC-DC controllers. |
Use Scenario: Safeguarding analog outputs of engine coolant temperature sensors exposed to load-dump events in 12 V systems. IC Role / Device Role / Timing Role: Cathode-connected to sensor output line, anode to ground-clamps fast-rising transients <1 ns. Use Value: Maintains signal integrity below 53.9 V while supporting AEC-Q101-compliant design validation for Tier-1 suppliers. |
| Telecom Interface Protection | Consumer Equipment Surge Mitigation |
Use Scenario: Shielding RS-485 transceiver inputs in base station remote units from lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Paired unidirectional TVS on differential pair (A/B lines), referenced to local ground plane. Use Value: Achieves <100 ps response time and holds common-mode voltage within safe margin of transceiver's absolute maximum rating. |
Use Scenario: Suppressing ESD and switching noise on USB VBUS lines in smart home hubs with 5 V–24 V multi-rail supplies. IC Role / Device Role / Timing Role: Mounted at connector entry point with short trace to ground pour to minimize inductance. Use Value: Absorbs 30 A contact discharge (IEC 61000-4-2) without parametric shift due to halogen-free, RoHS-compliant construction. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ36A-E3/52 | Higher VWM (36 V vs. 33.3 V), lower VC (58.1 V), same SMA package but 600 W PPPM | Better suited for 36 V nominal systems where tighter VWM/VBR margin is required | Select when higher standoff voltage tolerance is needed without increasing board area |
| 1.5SMC39A | Same VBR range (37.1–41.0 V), larger SMC (DO-214AB) package, 1500 W PPPM, higher IPPM (38.9 A) | Used in high-energy industrial motor drives where 400 W is insufficient | Choose only if mechanical space allows larger footprint and higher surge immunity is mandatory |
Compared with P4SMA39AHM3_A/I, SMBJ36A-E3/52 offers improved voltage margin for 36 V rails but requires verification of clamping headroom; 1.5SMC39A delivers superior energy handling in a larger package, making it unsuitable for space-constrained AEC-Q101 designs unless layout permits.
Availability
P4SMA39AHM3_A/I is available at Aetrix Electronics and suitable for industrial power supplies, automotive sensor modules, telecom interface circuits, and consumer equipment requiring stable component supply with AEC-Q101 qualification and halogen-free compliance.
Supply support for P4SMA39AHM3_A/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 designs and manufactures discrete semiconductors including diodes, rectifiers, and TVS devices, with emphasis on reliability, precision, and automotive-grade qualification.
The P4SMA series targets cost-sensitive, high-volume transient protection applications in automotive, industrial, and telecom systems-optimized for automated assembly and MSL Level 1 reflow compatibility.
FAQ
What is the maximum clamping voltage of the P4SMA39AHM3_A/I under rated surge conditions?
The P4SMA39AHM3_A/I exhibits a maximum clamping voltage (VC) of 53.9 V when subjected to its rated 7.4 A peak pulse current (IPPM) using the standardized 10/1000 µs waveform. This value is measured at TA = 25 °C with the device mounted on 5.0 mm × 5.0 mm copper pads per JEDEC standards. The P4SMA39AHM3_A/I maintains this clamping performance across its full operating temperature range, ensuring predictable overvoltage protection for downstream components.
Is the P4SMA39AHM3_A/I qualified for automotive applications?
Yes, the P4SMA39AHM3_A/I carries AEC-Q101 qualification, confirmed by Vishay's documentation for the HM3 suffix variant. It has passed stress tests including high-temperature reverse bias (HTRB), temperature cycling, and electrostatic discharge per JESD22-A114. The P4SMA39AHM3_A/I is intended for use in automotive subsystems such as body control modules and sensor interfaces where robust transient immunity is required.
What does the "HM3" suffix indicate in P4SMA39AHM3_A/I?
The "HM3" suffix in P4SMA39AHM3_A/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. The "H" specifies the tape-and-reel packaging format (7" or 13" reel), "M" confirms halogen-free molding compound, and "3" indicates compliance with JESD201 Class 2 whisker resistance. The "_A/I" portion identifies revision A and 13" reel delivery (7500 units per reel).
How does the thermal resistance of the P4SMA39AHM3_A/I affect its surge handling capability?
The P4SMA39AHM3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W, meaning each watt of sustained power raises the junction temperature by 120 °C above ambient. Under repetitive surge conditions, this value governs allowable duty cycle-e.g., at TA = 75 °C, the maximum average power must stay below ~0.63 W to avoid exceeding TJ = 150 °C. The P4SMA39AHM3_A/I relies on PCB copper area for heat dissipation, not heatsinks.
Can the P4SMA39AHM3_A/I replace bidirectional TVS diodes in AC-coupled circuits?
No, the P4SMA39AHM3_A/I is strictly unidirectional and lacks symmetrical clamping behavior. Using it in place of a bidirectional device (e.g., P4SMA39CA) on AC signal lines would result in forward conduction during negative half-cycles, causing excessive leakage, overheating, or failure. The P4SMA39AHM3_A/I must only be applied in DC-biased or polarity-defined protection paths where reverse conduction is blocked by system topology.
P4SMA39AHM3_A/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):
- 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_A/I FAQ
1.How can I place an order for P4SMA39AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA39AHM3_A/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 P4SMA39AHM3_A/I reliable?
The price and inventory of P4SMA39AHM3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA39AHM3_A/I is usually 5 days.
3.What payment methods are accepted for P4SMA39AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA39AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA39AHM3_A/I?
P4SMA39AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA39AHM3_A/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 P4SMA39AHM3_A/I?
For technical support, including P4SMA39AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA39AHM3_A/I requirements.
6.How does Aetrix verify that P4SMA39AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All P4SMA39AHM3_A/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 P4SMA39AHM3_A/I meets industry standards.
7.What is the process for return or replacement of P4SMA39AHM3_A/I?
All P4SMA39AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA39AHM3_A/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 P4SMA39AHM3_A/I part is unused and in its original packaging.
Return procedure for P4SMA39AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P4SMA39AHM3_A/I Tags
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Diodes Incorporated
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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