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Vishay General Semiconductor - Diodes Division P4SMA39CAHM3/I
- Part No.:
- P4SMA39CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA39CAHM3/I.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,060
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Product details
Overview
P4SMA39CAHM3/I 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 - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial systems.
For engineers reviewing the P4SMA39CAHM3/I datasheet, P4SMA39CAHM3/I pinout, P4SMA39CAHM3/I application, or P4SMA39CAHM3/I equivalent, this device is selected for bidirectional overvoltage protection where low-profile SMT placement, AEC-Q101 qualification, halogen-free RoHS compliance, and stable clamping under repetitive surge conditions are required.
Technical Context
The P4SMA39CAHM3/I operates as a symmetrical avalanche diode, conducting equally in both directions above its breakdown threshold. Its glass-passivated junction ensures consistent VBR tolerance (±5%) and low leakage (<1 µA at VWM), while the SMA package supports automated assembly and meets MSL Level 1 reflow requirements up to 260 °C peak.
It delivers 400 W peak pulse power (derated to 300 W above 91 V) under standardized 10/1000 µs transients, with thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead). The device is qualified to AEC-Q101 and rated for operation from –65 °C to +150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 33.3 V - Maximum continuous reverse voltage before conduction begins; defines safe operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 37.1–41.0 V at 1 mA - Confirmed avalanche onset range; ensures predictable turn-on during transients. |
| VC (Clamping Voltage) | 53.9 V at 7.4 A - Peak voltage seen by protected circuit during 10/1000 µs surge; limits stress on downstream components. |
| PPPM (Peak Pulse Power) | 400 W - Sustains single 10/1000 µs surges without degradation; derates to 300 W for devices >91 V VWM. |
| IPPM (Peak Pulse Current) | 7.4 A - Maximum transient current handled at VC; determines minimum series impedance needed for coordination. |
| TJmax | +150 °C - Enables reliable operation in under-hood automotive and high-temperature industrial environments. |
| Package | SMA (DO-214AC) - Low-profile SMT footprint (5.0 mm × 3.99 mm), compatible with standard reflow profiles and automated pick-and-place. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking. Cathode/anode terminals are symmetrical; device conducts identically in both directions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (bidirectional) | One terminal of symmetrical PN junction; connects to line being protected (e.g., CAN_H or RS-485 A). |
| Cathode | Transient current exit (bidirectional) | Second terminal of symmetrical PN junction; connects to reference (e.g., ground or complementary line). |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional transient suppression | Enables protection of AC-coupled or differential lines (e.g., RS-485, CAN, USB D+/D−) without polarity concerns. |
| AEC-Q101 qualification | Validated for automotive applications including engine control units, body electronics, and ADAS sensor interfaces. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets environmental compliance requirements for global OEM supply chains and industrial safety standards. |
| 400 W peak pulse power (10/1000 µs) | Handles IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) when properly coordinated with series impedance. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients, improving protection margin for sensitive 3.3 V or 5 V logic. |
Applications
| Automotive Sensor Protection | Industrial RS-485 Interface |
|---|---|
|
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 clamping transient energy before it reaches ADC input or signal conditioning op-amp. Use Value: Maintains signal integrity under ±100 V/50 ms load dump events while surviving 150 °C ambient per AEC-Q101 requirements. |
Use Scenario: Safeguarding half-duplex RS-485 transceivers (e.g., SN65HVD230) in factory automation PLCs subject to EFT and lightning-induced surges. IC Role / Device Role / Timing Role: Fast-response shunt device limiting line-to-ground voltage to ≤53.9 V during 10/1000 µs transients. Use Value: Prevents latch-up or permanent damage to transceiver I/O pins without adding propagation delay or signal distortion. |
| Consumer USB Port ESD | Telecom DSL Line Protection |
|
Use Scenario: Secondary-level protection on USB 2.0 data lines (D+/D−) after primary ESD array, guarding against contact discharge per IEC 61000-4-2. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp absorbing >8 kV HBM ESD events without signal attenuation. Use Value: Achieves <10 pF typical junction capacitance at VWM, preserving 480 Mbps USB 2.0 eye diagram integrity. |
Use Scenario: Overvoltage protection on ADSL/VDSL line drivers connected to outside plant wiring susceptible to lightning induction. IC Role / Device Role / Timing Role: High-energy TVS placed between transformer secondary and line driver IC to clamp induced surges. Use Value: Withstands repeated 10/1000 µs surges up to 400 W, extending system uptime in telecom central office and remote DSLAM deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ36CA | Higher VWM (36 V), same VBR range (40–44.2 V), SMB package (larger footprint, higher thermal mass) | Better suited for 36 V nominal bus systems; less optimal for space-constrained PCBs requiring SMA density | Select when board layout allows larger package and higher standoff margin is needed. |
| 1.5KE39CA | Through-hole DO-201 package, identical electrical specs but lower surge repetition capability due to higher RθJA (75 °C/W vs. 120 °C/W) | Preferred for prototyping or legacy through-hole designs; not suitable for high-density SMT production | Choose only for hand-soldered evaluation or repair scenarios where SMT infrastructure is unavailable. |
Compared with P4SMA39CAHM3/I, SMBJ36CA offers improved thermal handling in high-duty-cycle surge environments but sacrifices PCB area efficiency, while 1.5KE39CA retains identical clamping performance yet lacks AEC-Q101 qualification and automated assembly support.
Availability
P4SMA39CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial RS-485 networks, and consumer USB port protection requiring stable component supply, halogen-free compliance, and AEC-Q101 validation.
Supply support for P4SMA39CAHM3/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, and protection devices with emphasis on reliability, automotive qualification, and high-volume manufacturability.
The P4SMA Series targets cost-sensitive, high-reliability transient suppression across automotive, industrial, and communications markets - engineered for automated SMT assembly, AEC-Q101 compliance, and robust 10/1000 µs surge handling in compact SMA packages.
FAQ
What is the standoff voltage (VWM) of the P4SMA39CAHM3/I?
The P4SMA39CAHM3/I has a standoff voltage (VWM) of 33.3 V. This value represents the maximum DC or RMS voltage that can be continuously applied without triggering significant conduction. It ensures compatibility with 33 V nominal systems while maintaining sufficient margin below the 37.1–41.0 V breakdown range. The P4SMA39CAHM3/I maintains leakage current below 1 µA at this voltage, minimizing standby power loss in always-on circuits.
Is the P4SMA39CAHM3/I suitable for automotive applications?
Yes, the P4SMA39CAHM3/I is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant construction validated for automotive use. It operates reliably from –65 °C to +150 °C and withstands repetitive transients per ISO 7637-2 and IEC 61000-4-5. The P4SMA39CAHM3/I is commonly deployed in engine control modules, body control units, and ADAS camera sensor interfaces where robust bidirectional surge immunity is required.
What does the "CA" suffix mean in P4SMA39CAHM3/I?
The "CA" suffix in P4SMA39CAHM3/I denotes a bidirectional configuration - meaning the device functions identically in both polarities and has no cathode band marking. Unlike unidirectional variants (e.g., P4SMA39AHM3/I), the CA version suppresses transients on AC-coupled or differential signal lines such as CAN, RS-485, or USB D+/D− without requiring orientation-specific placement. This simplifies layout and eliminates polarity-related assembly errors.
What is the clamping voltage (VC) of the P4SMA39CAHM3/I at its rated peak pulse current?
The P4SMA39CAHM3/I exhibits a maximum clamping voltage (VC) of 53.9 V at 7.4 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value defines the upper voltage limit imposed on protected circuitry during surge events. The low VC/VBR ratio (≈1.45) reflects efficient avalanche response, ensuring downstream 3.3 V or 5 V ICs remain within absolute maximum ratings even during worst-case transients.
How does the HM3 suffix differ from E3 or M3 in the P4SMA39CAHM3/I ordering code?
The HM3 suffix in P4SMA39CAHM3/I specifies halogen-free, RoHS-compliant construction with AEC-Q101 qualification - distinguishing it from E3 (RoHS-compliant commercial grade) and M3 (halogen-free RoHS-compliant commercial grade). The HM3 variant undergoes additional stress testing per AEC-Q101, including HTGB, HTRB, and temperature cycling, making it suitable for automotive under-hood applications. The P4SMA39CAHM3/I is therefore certified for mission-critical vehicle subsystems where long-term reliability under thermal and mechanical stress is mandatory.
P4SMA39CAHM3/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:
- -
- 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/I FAQ
1.How can I place an order for P4SMA39CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA39CAHM3/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 P4SMA39CAHM3/I reliable?
The price and inventory of P4SMA39CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA39CAHM3/I is usually 5 days.
3.What payment methods are accepted for P4SMA39CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA39CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA39CAHM3/I?
P4SMA39CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA39CAHM3/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 P4SMA39CAHM3/I?
For technical support, including P4SMA39CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA39CAHM3/I requirements.
6.How does Aetrix verify that P4SMA39CAHM3/I is sourced from the original manufacturer or authorized distributors?
All P4SMA39CAHM3/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 P4SMA39CAHM3/I meets industry standards.
7.What is the process for return or replacement of P4SMA39CAHM3/I?
All P4SMA39CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA39CAHM3/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 P4SMA39CAHM3/I part is unused and in its original packaging.
Return procedure for P4SMA39CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P4SMA39CAHM3/I Tags
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