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Vishay General Semiconductor - Diodes Division P4SMA39CAHM3/H
- Part No.:
- P4SMA39CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA39CAHM3/H.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,261
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Product details
Overview
P4SMA39CAHM3/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 or 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 industrial and automotive electronics.
For engineers reviewing the P4SMA39CAHM3/H datasheet, P4SMA39CAHM3/H pinout, P4SMA39CAHM3/H application, or P4SMA39CAHM3/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance, low incremental surge resistance, and compatibility with automated SMT placement on standard PCB copper pads.
Technical Context
The P4SMA39CAHM3/H operates as a silicon avalanche diode with symmetrical bidirectional conduction, enabling transient suppression in AC-coupled or floating signal paths without polarity sensitivity. Its glass-passivated junction ensures stable breakdown characteristics and fast response time (<1 ns) to ESD and lightning-induced surges.
Thermally, it exhibits 120 °C/W junction-to-ambient thermal resistance (RθJA) on standard 0.2" × 0.2" copper pads and supports continuous power dissipation of 3.3 W at 50 °C ambient. The device is rated for operation from –65 °C to +150 °C junction temperature and meets J-STD-020 MSL Level 1 reflow profile (260 °C peak).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 33.3 V - Maximum continuous reverse voltage before significant leakage; defines operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 37.1–41.0 V at 1 mA - Avalanche onset range; ensures reliable triggering during overvoltage events. |
| VC (Clamping Voltage) | 53.9 V at 7.4 A IPPM - Peak voltage seen by protected circuit during 10/1000 µs surge; determines safe stress level for downstream components. |
| PPPM (Peak Pulse Power) | 400 W - Sustained transient energy handling per IEC 61000-4-5 waveform; enables robust protection against 4 kV EFT and indirect lightning surges. |
| IPPM (Peak Pulse Current) | 7.4 A - Maximum non-repetitive surge current supported; directly limits series impedance required for effective clamping. |
| TJ max. | +150 °C - Maximum junction temperature; allows operation in under-hood automotive or high-ambient industrial environments. |
| Package | SMA (DO-214AC) - Standard surface-mount outline with 5.28 mm length and 2.79 mm height; compatible with JEDEC-standard pick-and-place and reflow processes. |
Pinout & Package
SMA (DO-214AC) package: molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, and no polarity marking for bidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals function identically; bidirectional clamping occurs regardless of voltage polarity across the device. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for engine control, ADAS, and infotainment systems. |
| Halogen-free & RoHS-compliant | Meets IEC 61249-2-21 and JEDEC J-STD-203 requirements - supports green manufacturing and end-of-life compliance. |
| 400 W peak pulse power (10/1000 µs) | Enables protection against high-energy transients without external series impedance redesign - reduces BOM count in power rail protection. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients - improves clamping precision for sensitive analog or communication interfaces. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking - simplifies SMT line integration and inventory management. |
Applications
| Automotive Sensor Interface Protection | Industrial CAN Bus Line Protection |
|---|---|
Use Scenario: Protecting LIN/CAN transceiver inputs and outputs from load dump and ISO 7637-2 pulses in vehicle body control modules. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed across differential bus lines or between signal and ground to limit transient voltage excursions. Use Value: Maintains signal integrity during 12 V system load dump events (up to 120 V, 400 ms) while preserving CAN FD timing margins due to sub-nanosecond response. |
Use Scenario: Safeguarding RS-485/RS-422 transceivers in factory automation PLCs exposed to motor switching noise and ground bounce. IC Role / Device Role / Timing Role: Low-capacitance bidirectional suppressor shunting induced surges on twisted-pair data lines without distorting edge rates. Use Value: Prevents latch-up or permanent damage to transceivers during 4 kV ESD contact discharge while maintaining <10 pF junction capacitance at VWM. |
| Consumer Power Adapter Output Clamping | Telecom DSL Line Surge Protection |
Use Scenario: Secondary-side overvoltage suppression in AC/DC adapters for smart home devices subjected to mains-borne surges. IC Role / Device Role / Timing Role: Parallel-connected TVS absorbing energy from transformer leakage inductance spikes and rectifier reverse recovery. Use Value: Limits output rail overshoot to ≤54 V during 100 V/1 µs ring wave tests - avoids overvoltage shutdown in downstream DC-DC controllers. |
Use Scenario: Primary protection stage on ADSL/VDSL line cards interfacing with outside plant wiring vulnerable to lightning induction. IC Role / Device Role / Timing Role: First-line bidirectional clamp before gas discharge tube (GDT) and series impedance network. Use Value: Clips fast-rising surges (<100 ns) before GDT fires, reducing let-through voltage and extending overall protector lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33CA | Higher 600 W PPPM, larger SMB package (DO-214AA), 33 V VWM, 53.3 V VC at 11.8 A | Better suited for higher-energy surges; requires larger PCB footprint and different pad layout | Select when >400 W surge margin is needed and board space permits SMB footprint. |
| 1.5KE39CA | Through-hole DO-201 package, 1500 W PPPM, same 33.3 V VWM, 60.7 V VC at 24.8 A | Designed for legacy through-hole assembly; not compatible with automated SMT lines | Choose only for repair, retrofit, or prototyping where SMT is unavailable. |
Compared with SMBJ33CA and 1.5KE39CA, the P4SMA39CAHM3/H delivers optimal balance of 400 W surge capability, compact SMA footprint, AEC-Q101 qualification, and halogen-free compliance - making it preferred for new SMT-based automotive and industrial designs requiring validated reliability and regulatory alignment.
Availability
P4SMA39CAHM3/H is available at Aetrix Electronics and suitable for automotive sensor protection, industrial CAN bus interfaces, consumer power adapter output clamping, and telecom DSL line surge protection requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for P4SMA39CAHM3/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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The P4SMA Series is engineered for high-reliability transient suppression in automotive, industrial, and communications systems - delivering standardized TVS performance with AEC-Q101 qualification, halogen-free materials, and SMT-ready packaging.
FAQ
What is the clamping voltage of P4SMA39CAHM3/H at its rated peak pulse current?
The P4SMA39CAHM3/H has a maximum clamping voltage (VC) of 53.9 V at 7.4 A peak pulse current (IPPM) under 10/1000 µs waveform conditions. This value is measured per standard test methods and defines the upper voltage limit imposed on protected circuits during surge events. The P4SMA39CAHM3/H maintains this clamping performance across its specified operating temperature range and is validated per AEC-Q101 stress testing protocols.
Is P4SMA39CAHM3/H suitable for automotive applications?
Yes, the P4SMA39CAHM3/H is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant, and automotive-grade construction. It undergoes rigorous qualification including temperature cycling, high-temperature reverse bias, and ESD testing. The P4SMA39CAHM3/H is explicitly intended for use in automotive subsystems such as body electronics, infotainment, and sensor interfaces where transient immunity to ISO 7637-2 and IEC 61000-4-5 is required.
What does the "CA" suffix indicate in P4SMA39CAHM3/H?
The "CA" suffix in P4SMA39CAHM3/H denotes a bidirectional configuration - meaning the device provides symmetrical transient suppression in both polarities without cathode/anode orientation constraints. This differs from unidirectional "A" variants, which require correct polarity placement. The P4SMA39CAHM3/H therefore simplifies layout in AC-coupled or floating signal paths such as differential buses or transformer-isolated interfaces.
What is the standoff voltage (VWM) of P4SMA39CAHM3/H and why is it important?
The standoff voltage (VWM) of P4SMA39CAHM3/H is 33.3 V - the maximum continuous working voltage the device can withstand without entering avalanche conduction. This parameter ensures the P4SMA39CAHM3/H remains non-conductive during normal operation while providing sufficient margin below its 37.1–41.0 V breakdown range. Selecting VWM ≥10–20% above the system's maximum steady-state voltage prevents false triggering and leakage-related power loss.
Does P4SMA39CAHM3/H require special PCB layout considerations?
Yes - the P4SMA39CAHM3/H should be mounted on minimum recommended copper pads (0.2" × 0.2" / 5.0 mm × 5.0 mm per terminal) to achieve its rated 400 W peak pulse power and thermal performance. Short, low-inductance traces to protected nodes are essential to minimize let-through voltage during fast transients. The P4SMA39CAHM3/H benefits from symmetric routing and ground plane proximity to reduce loop inductance, especially in high-speed interface protection applications.
P4SMA39CAHM3/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:
- 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/H FAQ
1.How can I place an order for P4SMA39CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA39CAHM3/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/H reliable?
The price and inventory of P4SMA39CAHM3/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/H is usually 5 days.
3.What payment methods are accepted for P4SMA39CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA39CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA39CAHM3/H?
P4SMA39CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA39CAHM3/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/H?
For technical support, including P4SMA39CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA39CAHM3/H requirements.
6.How does Aetrix verify that P4SMA39CAHM3/H is sourced from the original manufacturer or authorized distributors?
All P4SMA39CAHM3/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/H meets industry standards.
7.What is the process for return or replacement of P4SMA39CAHM3/H?
All P4SMA39CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA39CAHM3/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/H part is unused and in its original packaging.
Return procedure for P4SMA39CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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