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Vishay General Semiconductor - Diodes Division P4SMA39CAHM3_A/H
- Part No.:
- P4SMA39CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA39CAHM3_A/H.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,289
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Product details
Overview
P4SMA39CAHM3_A/H from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on signal and power lines. It features a 33.3 V standoff voltage (VWM), 37.1–41.0 V breakdown voltage (VBR) at 1 mA, 53.9 V maximum clamping voltage (VC) at 7.4 A peak pulse current, and 400 W peak pulse power rating with 10/1000 µs waveform - suitable for protecting automotive sensor interfaces and industrial I/O lines.
For engineers reviewing the P4SMA39CAHM3_A/H datasheet, P4SMA39CAHM3_A/H pinout, P4SMA39CAHM3_A/H application, or P4SMA39CAHM3_A/H equivalent, this device delivers AEC-Q101 qualified transient suppression for bidirectional signal paths where low-profile mounting, fast response (<1 ns), and stable clamping under repetitive surge conditions are required.
Technical Context
The P4SMA39CAHM3_A/H operates as a symmetrical avalanche diode, conducting equally in both directions above its breakdown threshold. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low incremental surge resistance, enabling consistent clamping performance across temperature (–65 °C to +150 °C).
It meets J-STD-020 MSL Level 1 (peak reflow 260 °C), supports automated SMT placement, and is halogen-free and RoHS-compliant per HM3 suffix. The device is rated for 400 W peak pulse power (derated to 300 W above 91 V) and exhibits <1 ns response time with 0.1 % duty cycle capability at 300 pulses per minute.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Standoff) | 33.3 V - Maximum continuous reverse voltage before significant leakage; defines safe operating window for protected circuit. |
| VBR (Breakdown) | 37.1–41.0 V at 1 mA - Avalanche conduction onset range; tight tolerance ensures predictable turn-on during transients. |
| VC (Clamping) | 53.9 V at 7.4 A (10/1000 µs) - Peak voltage seen by downstream circuit during worst-case surge; limits stress on ICs/MOSFETs. |
| PPPM | 400 W - Surge energy handling capacity; sufficient for IEC 61000-4-5 Level 3 (1 kV/2 Ω) and ISO 7637-2 Pulse 1/2a. |
| IPPM | 7.4 A - Peak surge current supported without degradation; validated with 10/1000 µs waveform per Fig. 3. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive and industrial ambient environments. |
| Package | SMA (DO-214AC) - Standardized 2-pin SMD outline (5.28 mm × 4.50 mm × 2.29 mm); compatible with IPC-7351B footprint. |
Pinout & Package
SMA (DO-214AC) package: surface-mount, bidirectional, unmarked polarity (no cathode band). Terminals are matte tin-plated, solderable per J-STD-002 and JESD 22-B102. Mounting requires 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal for rated power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path (bidirectional) | Conducts surge current toward ground or rail during either polarity event; symmetric with cathode. |
| Cathode | Transient return path (bidirectional) | Functions identically to anode; no polarity marking required for CA-type devices. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensor protection. |
| Halogen-free & RoHS-compliant (HM3) | Meets automotive environmental standards and JESD201 Class 2 whisker resistance requirements. |
| 400 W peak pulse power (10/1000 µs) | Supports robust protection against load dump, inductive switching, and ESD-induced transients in harsh environments. |
| Low clamping ratio (VC/VBR ≈ 1.4) | Minimizes overvoltage stress on protected ICs - critical for 3.3 V/5 V logic and low-voltage MOSFET gates. |
| MSL Level 1 (260 °C peak) | Enables single-reflow assembly without moisture sensitivity concerns or baking requirements. |
Applications
| Automotive Sensor Interface | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from ISO 7637-2 Pulse 1 (inductive load dump) and ESD events. IC Role / Device Role / Timing Role: Bidirectional clamping element placed directly at connector entry point to shunt transients before reaching signal conditioning circuitry. Use Value: Maintains signal integrity under ±100 V transients while limiting clamped voltage to ≤53.9 V - within absolute maximum ratings of most automotive-grade op-amps and ADCs. |
Use Scenario: Safeguarding digital input/output channels on programmable logic controllers exposed to relay coil flyback, motor drive noise, and field wiring surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 24 V DC I/O lines, mounted adjacent to terminal block to minimize inductance in surge path. Use Value: Withstands 7.4 A surge current without degradation, enabling >100,000 surge cycles per IEC 61000-4-5 compliance testing. |
| Telecom Line Card Protection | Consumer Power Adapter Feedback Loop |
|
Use Scenario: Shielding Ethernet PHY interface components (e.g., magnetics, PHY ICs) from lightning-induced surges on PoE or data lines. IC Role / Device Role / Timing Role: Secondary-level TVS deployed after gas discharge tube (GDT) primary protection to handle residual fast-rising transients. Use Value: Sub-1 ns response time captures high-frequency overshoot missed by slower GDTs, reducing risk of PHY latch-up or damage. |
Use Scenario: Clamping feedback voltage spikes on optocoupler input side of isolated AC/DC adapters subjected to line surges or startup transients. IC Role / Device Role / Timing Role: Fast-acting bidirectional suppressor across TL431 reference input to prevent false regulation or shutdown. Use Value: 33.3 V VWM allows normal 2.5 V–12 V feedback operation while clamping >37 V transients - preserving regulation accuracy and safety margin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ36CA | Higher VWM (36 V), lower VC (58.1 V at 6.9 A), SMB package (larger footprint, higher thermal mass) | Better suited for 36 V nominal systems; less optimal for 24 V lines due to reduced margin below VBR | Select when board space allows larger SMB package and system VWM is ≥36 V. |
| 1.5SMC39CA | Same VWM/VBR/VC, but SMC package (DO-214AB), 1500 W rating, higher IPPM (32.4 A) | Designed for higher-energy surges (IEC 61000-4-5 Level 4); overqualified for typical sensor-level protection | Choose only if surge test requirements exceed 400 W or layout permits larger SMC footprint. |
Compared with SMBJ36CA and 1.5SMC39CA, the P4SMA39CAHM3_A/H offers optimal balance of compact SMA size, AEC-Q101 qualification, and precise 33.3 V standoff for 24 V automotive and industrial signal lines - avoiding overdesign while ensuring compliance with ISO 16750-2 and IEC 61000-4-5.
Availability
P4SMA39CAHM3_A/H is available at Aetrix Electronics and suitable for automotive sensor protection, industrial PLC I/O hardening, and telecom line card surge suppression requiring stable component supply, long-term lifecycle support, and traceable AEC-Q101 qualified sourcing.
Supply support for P4SMA39CAHM3_A/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, automotive qualification, and high-volume manufacturability.
The P4SMA Series targets cost-sensitive, space-constrained applications requiring robust transient suppression - especially in automotive electronics, industrial controls, and consumer power systems where AEC-Q101 compliance and halogen-free construction are mandatory.
FAQ
What is the standoff voltage (VWM) of the P4SMA39CAHM3_A/H?
The P4SMA39CAHM3_A/H has a standoff voltage (VWM) of 33.3 V, meaning it remains non-conductive up to this reverse voltage level under normal operating conditions. This value is confirmed in the Electrical Characteristics table of Vishay's Document Number 88367, ensuring compatibility with 24 V nominal systems while maintaining adequate margin below its 37.1–41.0 V breakdown range. The P4SMA39CAHM3_A/H maintains low leakage (<1 µA) at this voltage.
Is the P4SMA39CAHM3_A/H suitable for automotive applications?
Yes, the P4SMA39CAHM3_A/H is AEC-Q101 qualified (denoted by the HM3 suffix) and specifically designed for automotive use. It meets stringent requirements for temperature cycling, humidity resistance, and surge endurance. Its –65 °C to +150 °C operating range, MSL Level 1 reflow compatibility, and halogen-free construction make the P4SMA39CAHM3_A/H appropriate for under-hood and cabin modules including body control units and sensor interfaces.
What does the "CA" suffix indicate in P4SMA39CAHM3_A/H?
The "CA" suffix in P4SMA39CAHM3_A/H denotes a bidirectional configuration - meaning the device provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike unidirectional "A" variants, the CA version has no polarity marking and conducts identically in either direction above its breakdown voltage. This makes the P4SMA39CAHM3_A/H ideal for AC-coupled signal lines, differential buses, and floating power rails.
What is the maximum clamping voltage (VC) of the P4SMA39CAHM3_A/H at rated surge current?
The P4SMA39CAHM3_A/H has a maximum clamping voltage (VC) of 53.9 V at 7.4 A peak pulse current (10/1000 µs waveform), as specified in Vishay's official datasheet (Document Number 88367, page 2). This value represents the upper limit of voltage imposed on protected circuitry during a standardized surge event, ensuring downstream components like microcontrollers or transceivers remain within safe operating limits.
How does the P4SMA39CAHM3_A/H differ from the P4SMA39A variant?
The P4SMA39CAHM3_A/H is bidirectional (CA), AEC-Q101 qualified (HM3), and halogen-free, whereas the base P4SMA39A is unidirectional, commercial-grade (E3/M3), and lacks automotive qualification. The P4SMA39CAHM3_A/H also features matte tin-plated leads compliant with JESD201 Class 2 whisker testing - a requirement not met by standard P4SMA39A. These distinctions make the P4SMA39CAHM3_A/H suitable for automotive and high-reliability industrial use, unlike the general-purpose P4SMA39A.
P4SMA39CAHM3_A/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:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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)
P4SMA39CAHM3_A/H FAQ
1.How can I place an order for P4SMA39CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA39CAHM3_A/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 P4SMA39CAHM3_A/H reliable?
The price and inventory of P4SMA39CAHM3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA39CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for P4SMA39CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA39CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA39CAHM3_A/H?
P4SMA39CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA39CAHM3_A/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 P4SMA39CAHM3_A/H?
For technical support, including P4SMA39CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA39CAHM3_A/H requirements.
6.How does Aetrix verify that P4SMA39CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All P4SMA39CAHM3_A/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 P4SMA39CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of P4SMA39CAHM3_A/H?
All P4SMA39CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA39CAHM3_A/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 P4SMA39CAHM3_A/H part is unused and in its original packaging.
Return procedure for P4SMA39CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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