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Vishay General Semiconductor - Diodes Division P4SMA39CAHE3/5A
- Part No.:
- P4SMA39CAHE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA39CAHE3/5A.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,018
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Product details
Overview
P4SMA39CAHE3/5A from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, rated for 39 V standoff voltage (VWM), 43.3 V minimum breakdown voltage (VBR), and 53.9 V maximum clamping voltage (VC) at 7.4 A peak pulse current (IPPM), designed to protect signal lines and power rails in automotive and industrial electronics against ESD and inductive switching transients.
For engineers reviewing the P4SMA39CAHE3/5A datasheet, P4SMA39CAHE3/5A pinout, P4SMA39CAHE3/5A application, or P4SMA39CAHE3/5A equivalent, this device delivers AEC-Q101 qualification, 400 W peak pulse power (10/1000 µs), low clamping ratio (VC/VBR ≈ 1.25), and MSL Level 1 moisture sensitivity - critical for high-reliability automotive PCB designs requiring robust transient immunity without layout redesign.
Technical Context
The P4SMA39CAHE3/5A operates as a bidirectional avalanche diode with symmetrical clamping in both polarities, enabling protection of AC-coupled or differential signal paths without polarity constraints. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1 µA at VWM).
It features a thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead), supporting operation up to 150 °C junction temperature. The device sustains 40 A non-repetitive forward surge current (IFSM) and meets UL 497B recognition for telecom and industrial protector classification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Standoff) | 33.3 V - Maximum continuous reverse working voltage before conduction begins; defines safe operating margin below clamping threshold. |
| VBR (Breakdown) | 37.1–41.0 V at 1 mA - Verified avalanche onset range; ensures predictable turn-on during transients. |
| VC (Clamping) | 53.9 V at 7.4 A (10/1000 µs) - Peak voltage seen by protected circuit under worst-case surge; enables downstream ICs with ≥54 V abs max rating to survive. |
| PPPM | 400 W - Peak pulse power handling capability; supports IEC 61000-4-5 Level 4 (4 kV/2 Ω) surge testing when properly laid out. |
| ID (Leakage) | <1 µA at VWM - Negligible standby current; avoids loading sensitive analog or low-power sensor circuits. |
| TJ max | 150 °C - Enables use in under-hood automotive environments and thermally constrained industrial enclosures. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD (HBM ≥8 kV, CDM ≥1 kV). |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102; no polarity marking for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity) | Serves as one terminal of symmetrical avalanche junction; connects to line being protected (e.g., RS-485 A or CAN_H). |
| Cathode | Transient current entry (positive polarity) | Second terminal of symmetrical junction; ties to same protected line (bidirectional symmetry eliminates need for orientation awareness). |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses (e.g., CAN, RS-485), or ungrounded power rails without polarity concerns. |
| 400 W peak pulse power (10/1000 µs) | Withstands IEC 61000-4-5 combination wave surges up to 4 kV when mounted on 5 mm × 5 mm copper pads. |
| AEC-Q101 qualified (HE3 suffix) | Validated for automotive applications including engine control units, body electronics, and ADAS sensor interfaces. |
| MSL Level 1 (260 °C reflow) | Compatible with standard lead-free SMT assembly processes without baking or special handling. |
| UL 497B recognized (QVGQ2) | Meets safety requirements for telecom and industrial surge protection modules requiring third-party certification. |
Applications
| Automotive Sensor Interface Protection | Industrial RS-485 Bus Protection |
|---|---|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine bay modules exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed between sensor output and microcontroller ADC input. Use Value: Limits transient voltage to ≤53.9 V, preventing latch-up or damage to 5 V or 3.3 V ADC front-ends while maintaining <1 µA leakage at 33.3 V nominal rail. |
Use Scenario: Safeguarding half-duplex RS-485 transceivers (e.g., SN65HVD230) in factory automation PLCs subject to cable-induced lightning surges. IC Role / Device Role / Timing Role: Line-to-line and line-to-ground TVS across A/B differential pair and GND. Use Value: Clamps common-mode surges to <54 V within nanoseconds, preserving signal integrity and avoiding bus lockup during 4 kV IEC 61000-4-5 testing. |
| Consumer USB Port ESD Protection | Telecom DSL Line Surge Suppression |
Use Scenario: Shielding USB 2.0 D+/D− lines in set-top boxes and smart displays from HBM ESD events (>8 kV) during handling and plugging. IC Role / Device Role / Timing Role: Bidirectional TVS placed directly at USB connector, before series impedance. Use Value: Responds in <1 ns to divert >15 A ESD current, limiting voltage to <54 V and preventing damage to USB PHY transceivers with 5.5 V absolute max ratings. |
Use Scenario: Front-end protection of ADSL/VDSL line drivers in DSLAMs and customer premises equipment subjected to induced surges from nearby power lines. IC Role / Device Role / Timing Role: Primary line-to-line TVS on twisted-pair input, coordinated with gas discharge tube (GDT) secondary protection. Use Value: Absorbs first 400 W surge energy with low clamping, allowing GDT to handle sustained follow current - extends system MTBF in telco central office environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ39CA | Same VWM/VBR/VC specs but SMB (DO-214AA) package - 2.5 mm wider, higher thermal mass, RθJA = 85 °C/W. | Better power dissipation in high-duty-cycle surges; requires larger PCB footprint and may not fit space-constrained automotive modules. | Select SMBJ39CA only if board layout allows 2.5 mm extra width and thermal performance exceeds 120 °C/W requirement. |
| 1.5KE39CA | Through-hole TO-218 package; 1500 W PPPM rating but slower response due to higher junction capacitance (~200 pF vs. ~50 pF). | Suitable for AC mains or low-frequency power rail protection; unsuitable for high-speed data lines due to capacitive loading. | Choose 1.5KE39CA for legacy through-hole designs or where surge energy exceeds 400 W, but avoid for USB/RS-485/CAN. |
Compared with SMBJ39CA and 1.5KE39CA, the P4SMA39CAHE3/5A offers optimal balance of compact SMA footprint, AEC-Q101 qualification, and sub-50 pF capacitance - making it the preferred choice for modern automotive and high-speed industrial communication interfaces where space, reliability, and signal integrity are jointly constrained.
Availability
P4SMA39CAHE3/5A is available at Aetrix Electronics and suitable for automotive sensor modules, industrial RS-485 networks, consumer USB ports, and telecom DSL line cards requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for P4SMA39CAHE3/5A 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, efficiency, and application-specific optimization.
The P4SMA Series is engineered for high-reliability transient suppression in automotive, industrial, and telecom systems - delivering consistent clamping performance, AEC-Q101 validation, and surface-mount compatibility for automated manufacturing.
FAQ
What is the clamping voltage of P4SMA39CAHE3/5A at its rated peak pulse current?
The P4SMA39CAHE3/5A has a maximum clamping voltage (VC) of 53.9 V at 7.4 A peak pulse current with a 10/1000 µs waveform. This value is measured per standard test conditions and defines the upper voltage limit imposed on protected circuitry during surge events. The P4SMA39CAHE3/5A maintains this clamping performance across its specified operating temperature range and is validated per JEDEC and IEC standards.
Is P4SMA39CAHE3/5A suitable for automotive applications?
Yes, P4SMA39CAHE3/5A is AEC-Q101 qualified (indicated by the HE3 suffix) and specifically designed for automotive use. It passes stress tests including temperature cycling, high-temperature reverse bias, and ESD (HBM ≥8 kV). The P4SMA39CAHE3/5A is deployed in engine control units, body control modules, and ADAS sensor interfaces where transient immunity and long-term reliability are mandatory.
How does the bidirectional configuration of P4SMA39CAHE3/5A affect PCB layout?
The P4SMA39CAHE3/5A has no polarity marking and functions identically in both directions, eliminating orientation constraints during placement. This simplifies automated assembly and enables symmetric protection of differential lines like CAN or RS-485 without concern for anode/cathode alignment. The P4SMA39CAHE3/5A requires only two pads matching the SMA (DO-214AC) outline - no silkscreen polarity indicator is needed.
What is the maximum steady-state power dissipation of P4SMA39CAHE3/5A?
The P4SMA39CAHE3/5A has a maximum steady-state power dissipation (PD) of 3.3 W at TA = 50 °C on an infinite heatsink. In typical PCB layouts with 5 mm × 5 mm copper pads per terminal, derating applies above 25 °C ambient - for example, PD drops to ~2.2 W at 85 °C ambient. The P4SMA39CAHE3/5A is intended for transient suppression, not continuous power handling.
Does P4SMA39CAHE3/5A meet any safety certifications?
Yes, P4SMA39CAHE3/5A is Underwriters Laboratory (UL) recognized under standard UL 497B (file E136766) for protector classification in telecom and industrial applications. It also meets RoHS compliance (HE3 suffix) and MSL Level 1 per J-STD-020. The P4SMA39CAHE3/5A carries no halogen content and complies with Vishay's material categorization per doc#99912.
P4SMA39CAHE3/5A 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:
- -
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
P4SMA39CAHE3/5A FAQ
1.How can I place an order for P4SMA39CAHE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA39CAHE3/5A 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 P4SMA39CAHE3/5A reliable?
The price and inventory of P4SMA39CAHE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA39CAHE3/5A is usually 5 days.
3.What payment methods are accepted for P4SMA39CAHE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA39CAHE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA39CAHE3/5A?
P4SMA39CAHE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA39CAHE3/5A 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 P4SMA39CAHE3/5A?
For technical support, including P4SMA39CAHE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA39CAHE3/5A requirements.
6.How does Aetrix verify that P4SMA39CAHE3/5A is sourced from the original manufacturer or authorized distributors?
All P4SMA39CAHE3/5A 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 P4SMA39CAHE3/5A meets industry standards.
7.What is the process for return or replacement of P4SMA39CAHE3/5A?
All P4SMA39CAHE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA39CAHE3/5A, 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 P4SMA39CAHE3/5A part is unused and in its original packaging.
Return procedure for P4SMA39CAHE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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