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Vishay General Semiconductor - Diodes Division P4SMA39CAHM3_A/I
- Part No.:
- P4SMA39CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA39CAHM3_A/I.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,865
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Product details
Overview
P4SMA39CAHM3_A/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 electronics.
For engineers reviewing the P4SMA39CAHM3_A/I datasheet, P4SMA39CAHM3_A/I pinout, P4SMA39CAHM3_A/I application, or P4SMA39CAHM3_A/I 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 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional construction, enabling protection of AC-coupled or differential signal lines without polarity concerns. Its glass-passivated junction ensures stable breakdown characteristics and fast response time (<1 ns), while the SMA package supports high thermal dissipation via PCB copper pad conduction.
The device delivers 400 W peak pulse power (derated to 300 W above 91 V) under 10/1000 µs waveform, with a maximum junction temperature of +150 °C and thermal resistance of 120 °C/W (junction-to-ambient). It meets J-STD-020 MSL Level 1 and passes JESD201 Class 2 whisker testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 33.3 V - Maximum continuous reverse working voltage before clamping begins; defines safe operating margin below breakdown. |
| VBR (Breakdown Voltage) | 37.1–41.0 V at 1 mA - Confirmed breakdown threshold range; ensures reliable turn-on during transient events. |
| VC (Clamping Voltage) | 53.9 V at 7.4 A IPPM - Peak voltage seen by protected circuit during 10/1000 µs surge; determines stress on downstream components. |
| PPPM (Peak Pulse Power) | 400 W - Sustained transient energy handling capacity with 10/1000 µs waveform; enables robust ESD and lightning surge protection. |
| IPPM (Peak Pulse Current) | 7.4 A - Maximum non-repetitive surge current supported; defines minimum trace width and layout robustness required. |
| TJ max. | +150 °C - Maximum allowable junction temperature; sets thermal design limits for PCB copper area and ambient conditions. |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with 0.208" × 0.157" footprint; compatible with industry-standard pick-and-place and reflow profiles. |
Pinout & Package
SMA (DO-214AC) package: molded plastic case with matte tin-plated leads, UL 94 V-0 rated, no polarity marking for bidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (bidirectional) | One terminal of symmetrical PN junction; accepts surge current from either direction during overvoltage events. |
| Cathode | Transient current exit (bidirectional) | Second terminal of symmetrical PN junction; completes low-impedance path to ground or reference rail during clamping. |
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-609A Class 1 requirements - supports green manufacturing and end-of-life compliance. |
| 400 W peak pulse power | Handles IEC 61000-4-5 Level 4 surges (4 kV line-earth, 2 kV line-line) without degradation when mounted per recommended 0.2" × 0.2" copper pads. |
| Low clamping ratio (VC/VBR ≈ 1.4) | Minimizes voltage overshoot during transients - critical for protecting 3.3 V and 5 V logic interfaces with tight VIH/VIL margins. |
| MSL Level 1, 260 °C peak reflow | Compatible with standard lead-free reflow profiles without pre-baking - reduces production complexity and cost. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and inductive switching transients in 12 V vehicle subsystems. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across differential signal pair or supply rail to limit transient excursions within IC absolute maximum ratings. Use Value: Prevents latch-up or permanent damage to microcontrollers and analog front-ends during ISO 7637-2 Pulse 5a (load dump) events up to 60 V. |
Use Scenario: Safeguarding digital input modules in programmable logic controllers against field-wiring induced surges from solenoid coils and motor drives. IC Role / Device Role / Timing Role: Parallel-connected transient suppressor on 24 V DC input terminals to shunt surge energy before it reaches optocoupler or Schmitt trigger input stages. Use Value: Maintains functional safety integrity by limiting input voltage to ≤53.9 V during 1 kV/500 A 10/1000 µs surges per IEC 61000-4-5. |
| Telecom Line Interface Protection | Consumer USB Port ESD Protection |
Use Scenario: Shielding RS-485 transceivers and Ethernet PHYs in base station backhaul equipment from lightning-induced common-mode surges on twisted-pair cabling. IC Role / Device Role / Timing Role: Bidirectional TVS array element placed between differential line pair and ground to clamp mode conversion transients without distorting signal integrity. Use Value: Enables compliance with GR-1089-CORE Zone 3 immunity requirements (2 kV differential, 4 kV common-mode) without adding series impedance. |
Use Scenario: Guarding USB 2.0 data lines (D+/D−) and VBUS against human-body-model (HBM) and IEC 61000-4-2 contact discharge events in portable audio/video devices. IC Role / Device Role / Timing Role: Low-capacitance bidirectional suppressor placed directly at connector to intercept ESD before reaching USB controller ESD diodes. Use Value: Provides <1 ns response time and <55 V clamping to prevent bit errors or port reset during ±8 kV contact discharge per IEC 61000-4-2 Level 4. |
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 600 W peak pulse power, larger SMB (DO-214AA) package, 36 V VWM, 58.1 V VC at 10.3 A | Better suited for higher-energy surges but requires larger PCB area and has slower thermal response than SMA | Select when system-level surge tests exceed 400 W and board space allows SMB footprint |
| 1.5KE39CA | Through-hole TO-204AE (DO-201AE) package, same 33.3 V VWM, 53.9 V VC, but lower 1.5 kW peak power rating and higher parasitic inductance | Used in legacy designs or prototyping where manual assembly or high-power derating is acceptable | Choose only for through-hole prototypes or repair scenarios - not for new SMT production |
Compared with SMBJ36CA and 1.5KE39CA, P4SMA39CAHM3_A/I offers optimal balance of compact size, AEC-Q101 qualification, and 400 W surge handling for automotive and industrial SMT designs - delivering verified reliability without layout redesign or thermal compromise.
Availability
P4SMA39CAHM3_A/I is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, telecom line interface boards, and consumer USB host ports requiring stable component supply, halogen-free compliance, and AEC-Q101 validation.
Supply support for P4SMA39CAHM3_A/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 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 environments - combining glass-passivated junctions, standardized SMT packaging, and rigorous qualification to meet demanding environmental and surge immunity standards.
FAQ
What is the clamping voltage of P4SMA39CAHM3_A/I at its rated peak pulse current?
The P4SMA39CAHM3_A/I has 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 is measured per Figure 1 in Vishay document 88367 and defines the upper voltage limit imposed on protected circuits during surge events. The P4SMA39CAHM3_A/I maintains this clamping performance across its full operating temperature range of -65 °C to +150 °C.
Is P4SMA39CAHM3_A/I qualified for automotive applications?
Yes, P4SMA39CAHM3_A/I is AEC-Q101 qualified, as confirmed by its HM3 suffix and documentation in Vishay's P4SMA series datasheet (Rev. 09-Jan-2024, Doc. #88367). This qualification covers stress tests including HTGB, H3TRB, TCT, and ESD, making P4SMA39CAHM3_A/I suitable for use in engine control units, body electronics, and ADAS sensors where automotive-grade reliability is mandatory.
What does the "HM3" suffix indicate in P4SMA39CAHM3_A/I?
The "HM3" suffix in P4SMA39CAHM3_A/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. Per Vishay's ordering information table, HM3 parts use molding compounds and plating that meet JEDEC J-STD-609A Class 1 and pass JESD201 Class 2 whisker testing - distinguishing them from commercial-grade M3 or HE3 variants and ensuring suitability for automotive and green-electronics programs.
How does P4SMA39CAHM3_A/I differ from unidirectional P4SMA39A variants?
P4SMA39CAHM3_A/I is bidirectional, meaning it clamps voltage transients equally in both polarities - ideal for AC signals, differential buses, or floating rails. In contrast, unidirectional P4SMA39A has a cathode band and conducts only in reverse bias, requiring correct orientation during placement. Both share identical VWM (33.3 V), VBR (37.1–41.0 V), and VC (53.9 V), but P4SMA39CAHM3_A/I eliminates polarity concerns in layout and assembly.
What PCB pad layout is recommended for optimal thermal performance of P4SMA39CAHM3_A/I?
Vishay specifies mounting P4SMA39CAHM3_A/I on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve its rated 400 W peak pulse power. This layout minimizes thermal resistance and prevents localized overheating during repetitive surges. The P4SMA39CAHM3_A/I datasheet (Fig. 2) confirms derating curves assume this pad size - smaller pads reduce surge capability and risk metallization failure.
P4SMA39CAHM3_A/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:
- 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/I FAQ
1.How can I place an order for P4SMA39CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA39CAHM3_A/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_A/I reliable?
The price and inventory of P4SMA39CAHM3_A/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_A/I is usually 5 days.
3.What payment methods are accepted for P4SMA39CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA39CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA39CAHM3_A/I?
P4SMA39CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA39CAHM3_A/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_A/I?
For technical support, including P4SMA39CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA39CAHM3_A/I requirements.
6.How does Aetrix verify that P4SMA39CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All P4SMA39CAHM3_A/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_A/I meets industry standards.
7.What is the process for return or replacement of P4SMA39CAHM3_A/I?
All P4SMA39CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA39CAHM3_A/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_A/I part is unused and in its original packaging.
Return procedure for P4SMA39CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P4SMA39CAHM3_A/I Tags
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