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Vishay General Semiconductor - Diodes Division P4SMA39AHM3/I
- Part No.:
- P4SMA39AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA39AHM3/I.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,415
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Product details
Overview
P4SMA39AHM3/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) and is AEC-Q101 qualified for automotive applications including sensor signal line protection.
For engineers reviewing the P4SMA39AHM3/I datasheet, P4SMA39AHM3/I pinout, P4SMA39AHM3/I application, or P4SMA39AHM3/I equivalent, key selection considerations include its unidirectional polarity, 150 °C max junction temperature, 120 °C/W junction-to-ambient thermal resistance, and halogen-free RoHS-compliant construction with matte tin-plated leads.
Technical Context
The P4SMA39AHM3/I operates as a clamping-type overvoltage protector: under normal conditions it presents high impedance above VWM (33.3 V), then rapidly transitions to low-impedance conduction when transient voltage exceeds VBR (min. 37.1 V), limiting downstream voltage to ≤53.9 V at 7.4 A. Its glass-passivated junction ensures stable breakdown characteristics and fast response time (<1 ns).
Designed for surface-mount assembly on standard PCB copper pads (0.2" × 0.2"), it supports repetitive surge duty cycles up to 0.01% and meets MSL Level 1 per J-STD-020 with 260 °C lead-free reflow peak. The HM3 suffix confirms halogen-free, RoHS-compliant, and AEC-Q101-qualified construction for automotive-grade reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 37.1 V / 41.0 V at 1 mA test current - defines precise voltage threshold at which clamping begins |
| VWM | 33.3 V - maximum continuous reverse operating voltage before leakage exceeds 1 µA |
| VC @ IPPM | 53.9 V at 7.4 A - clamped voltage seen by protected circuit during 10/1000 µs surge |
| PPPM | 400 W - peak transient energy absorption capability under standardized surge waveform |
| IFSM | 40 A - maximum non-repetitive forward surge current (8.3 ms half-sine), critical for inductive load switching |
| TJ max | +150 °C - maximum junction temperature enabling operation in under-hood automotive environments |
| RθJA | 120 °C/W - thermal resistance from junction to ambient air, informs PCB pad sizing and layout cooling needs |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, molded plastic case with matte tin-plated leads; cathode indicated by band on body; compliant with UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / transient return path | Connected to ground or low-side reference in unidirectional TVS configuration |
| Cathode | Clamping output / protected line connection | Connected to signal/power line requiring protection; clamps to VC during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 µs) | Enables robust protection against ISO 7637-2 Pulse 1/2a/5a transients in 12 V automotive systems |
| AEC-Q101 qualification (HM3 suffix) | Validated for automotive use including engine control units, ADAS sensors, and infotainment interfaces |
| Glass passivated chip junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity stress |
| Halogen-free & RoHS-compliant | Meets automotive OEM environmental requirements and supports lead-free reflow soldering (260 °C peak) |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life before reflow; no baking required prior to assembly |
Applications
| Automotive Sensor Signal Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting analog voltage outputs of pressure, temperature, and position sensors in engine bays exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between sensor output and ECU input to clamp transients before they reach ADC front-end. Use Value: Limits induced surges to ≤53.9 V, preventing damage to 3.3 V or 5 V microcontroller inputs while maintaining signal integrity below 33.3 V. |
Use Scenario: Safeguarding 24 V DC digital input channels on programmable logic controllers subjected to relay coil flyback and field wiring ESD. IC Role / Device Role / Timing Role: Standoff device connected across input terminals to shunt fast-rising transients (>1 kV/µs) to common ground. Use Value: Absorbs 400 W pulses without degradation, ensuring >100,000 surge cycles per IEC 61000-4-5 Level 3 compliance. |
| Telecom Power Rail Clamping | Consumer USB Port ESD Suppression |
Use Scenario: Secondary overvoltage protection on +48 V telecom power distribution boards downstream of primary DC/DC converters. IC Role / Device Role / Timing Role: Fast-clamping TVS in parallel with bulk capacitance to suppress switching noise and lightning-induced surges. Use Value: Clamps 10/1000 µs surges to 53.9 V within <1 ns, preventing latch-up in PMICs and protecting PoE interface ICs. |
Use Scenario: Board-level ESD protection for USB 2.0 data lines and VBUS in portable audio devices and smart home hubs. IC Role / Device Role / Timing Role: Low-capacitance unidirectional suppressor on VBUS line to handle ±15 kV contact discharge per IEC 61000-4-2. Use Value: With 1 µA max leakage at 33.3 V, avoids battery drain while clamping ESD events to safe levels for USB PHY transceivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ39AHE3/A | Same VBR range (37.1–41.0 V), identical SMA package, but E3 suffix indicates commercial-grade (non-AEC-Q101) and RoHS-compliant only (not halogen-free) | Lacks automotive qualification; suitable for industrial/commercial designs where AEC-Q101 is not mandated | Select when cost sensitivity outweighs automotive reliability requirements and halogen-free mandate is absent |
| 1.5SMC39A | Higher power rating (1500 W), larger SMC (DO-214AB) package, same VBR/VC specs but 12.5 A IPPM; not AEC-Q101 qualified | Requires larger PCB footprint and higher thermal mass; used where surge energy exceeds 400 W limits | Choose for high-energy industrial motor drives or power supply inputs needing >1 kW surge handling |
Compared with SMAJ39AHE3/A, P4SMA39AHM3/I adds AEC-Q101 qualification and halogen-free compliance for automotive use; compared with 1.5SMC39A, it trades surge capacity for compact size and automotive grade-making it optimal for space-constrained, safety-critical vehicle subsystems.
Availability
P4SMA39AHM3/I is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, and telecom power distribution boards requiring stable component supply, long-lifecycle support, and AEC-Q101-compliant transient protection.
Supply support for P4SMA39AHM3/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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific performance.
The P4SMA Series targets automotive and industrial transient suppression, engineered for high-surge resilience, low clamping voltage, and seamless integration into automated SMT assembly lines using standard DO-214AC footprints.
FAQ
What is the clamping voltage of the P4SMA39AHM3/I and how does it protect downstream circuits?
The P4SMA39AHM3/I clamps transients to 53.9 V at 7.4 A peak pulse current (10/1000 µs waveform). This means that when a voltage spike exceeds the breakdown threshold (~37.1 V), the device conducts heavily, limiting the voltage seen by downstream components to ≤53.9 V-well below typical IC damage thresholds. Its sub-nanosecond response ensures protection before sensitive circuitry is stressed, making P4SMA39AHM3/I effective for safeguarding microcontrollers, sensors, and communication interfaces.
Is the P4SMA39AHM3/I suitable for automotive applications, and what qualifications does it hold?
Yes, the P4SMA39AHM3/I is explicitly qualified to AEC-Q101 for automotive use, confirmed by the "HM3" suffix. It also meets MSL Level 1 per J-STD-020 (260 °C reflow peak), features halogen-free and RoHS-compliant construction, and is rated for operation from −65 °C to +150 °C. These attributes make P4SMA39AHM3/I appropriate for under-hood ECUs, ADAS camera modules, and body control units where reliability under thermal and mechanical stress is mandatory.
How does the P4SMA39AHM3/I differ from bidirectional TVS diodes like P4SMA39CHM3/I?
The P4SMA39AHM3/I is unidirectional and intended for DC-biased lines (e.g., power rails or single-ended signals referenced to ground), conducting only in reverse breakdown. In contrast, P4SMA39CHM3/I is bidirectional, symmetrically clamping both positive and negative transients-ideal for AC lines or differential signals like RS-485. The "A" suffix denotes unidirectional function; "C" denotes bidirectional. Both share the same VBR, VC, and package, but polarity and application scope differ fundamentally.
What is the maximum steady-state power dissipation of the P4SMA39AHM3/I, and how does thermal design impact its surge performance?
The P4SMA39AHM3/I has a maximum steady-state power dissipation (PD) of 3.3 W at TA = 50 °C on an infinite heatsink. Its junction-to-ambient thermal resistance (RθJA) is 120 °C/W, meaning each watt of power raises junction temperature by 120 °C above ambient. For reliable 400 W surge handling, PCB copper pad area must follow Vishay's recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) layout to limit thermal derating-ensuring P4SMA39AHM3/I maintains full pulse rating without exceeding 150 °C junction temperature.
Can the P4SMA39AHM3/I be used in place of older P4SMA39A-E3/61 parts, and what are the key material differences?
Yes, P4SMA39AHM3/I is a direct functional replacement for P4SMA39A-E3/61 in most applications, sharing identical electrical specs (VBR, VWM, VC, PPPM) and SMA package. The key difference lies in materials: HM3 denotes halogen-free, RoHS-compliant construction with enhanced environmental compliance, whereas E3 is RoHS-compliant but not halogen-free. Both meet J-STD-002 solderability and JESD22-B102 whisker testing, but P4SMA39AHM3/I satisfies stricter automotive OEM substance restrictions.
P4SMA39AHM3/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:
- 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/I FAQ
1.How can I place an order for P4SMA39AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA39AHM3/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/I reliable?
The price and inventory of P4SMA39AHM3/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/I is usually 5 days.
3.What payment methods are accepted for P4SMA39AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA39AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA39AHM3/I?
P4SMA39AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA39AHM3/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/I?
For technical support, including P4SMA39AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA39AHM3/I requirements.
6.How does Aetrix verify that P4SMA39AHM3/I is sourced from the original manufacturer or authorized distributors?
All P4SMA39AHM3/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/I meets industry standards.
7.What is the process for return or replacement of P4SMA39AHM3/I?
All P4SMA39AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA39AHM3/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/I part is unused and in its original packaging.
Return procedure for P4SMA39AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P4SMA39AHM3/I Tags
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