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Vishay General Semiconductor - Diodes Division P4SMA39AHE3/5A
- Part No.:
- P4SMA39AHE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA39AHE3/5A.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,338
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Product details
Overview
P4SMA39AHE3/5A from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in the P4SMA series, designed for clamping voltage transients on power and signal lines. It features a 33.3 V stand-off 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 a 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor signal lines in industrial and automotive electronics.
For engineers reviewing the P4SMA39AHE3/5A datasheet, P4SMA39AHE3/5A pinout, P4SMA39AHE3/5A application, or P4SMA39AHE3/5A equivalent, key selection criteria include clamping performance under 10/1000 µs surge, AEC-Q101 qualification status, unidirectional polarity marking, SMA (DO-214AC) package thermal resistance (RθJA = 120 °C/W), and compliance with UL 497B for telecom and industrial surge protection.
Technical Context
The P4SMA39AHE3/5A operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its breakdown threshold (VBR), thereby diverting transient energy to ground. Its glass-passivated junction ensures stable leakage (<1 µA at VWM) and fast response time (<1.0 ps), critical for protecting sensitive CMOS inputs and low-voltage microcontrollers.
Thermally, it uses an SMA (DO-214AC) package with matte tin-plated leads solderable per J-STD-002, rated for TJ = –65 °C to +150 °C and meeting MSL Level 1 (260 °C peak reflow). The device delivers 400 W peak pulse power at TA = 25 °C, derating linearly above 25 °C per Figure 2, and supports repetitive surges at 0.01% duty cycle.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 33.3 V - Maximum continuous reverse operating voltage before conduction begins; defines safe operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 37.1–41.0 V at IT = 1 mA - Avalanche onset range; determines minimum trigger level for transient suppression. |
| VC (Clamping Voltage) | 53.9 V at IPPM = 7.4 A (10/1000 µs) - Peak voltage seen by protected circuit during worst-case surge; must be below IC absolute maximum ratings. |
| PPPM (Peak Pulse Power) | 400 W - Surge energy handling capability under standard 10/1000 µs waveform; enables robust protection against IEC 61000-4-5 Level 4 transients. |
| ID (Reverse Leakage) | <1.0 µA at VWM - Minimal standby current; preserves battery life and avoids false triggering in low-power sensor interfaces. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive and industrial control environments. |
| AEC-Q101 Qualified | Yes - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing; required for ADAS and body control modules. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile plastic case with UL 94 V-0 flammability rating. Cathode indicated by band; anode is unmarked end. Dimensions: 4.93 mm × 3.99 mm × 2.29 mm (L × W × H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse voltage reference node | Connected to protected line (e.g., 3.3 V rail or CAN_H); forms cathode-to-ground clamping path during overvoltage. |
| Cathode | Avalanche conduction terminal / Ground reference | Must be tied directly to low-impedance system ground plane; determines clamping voltage accuracy and thermal dissipation path. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 µs) | Enables single-device protection against high-energy surges per IEC 61000-4-5 without external current limiting. |
| AEC-Q101 qualified (HE3 suffix) | Validated for automotive applications including engine control units and infotainment systems requiring extended lifetime and stress reliability. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 7637-2 pulse 1/2a), improving protection fidelity for 5 V and 3.3 V logic. |
| Glass passivated chip junction | Ensures stable VBR tolerance and low leakage across –65 °C to +150 °C, critical for outdoor and industrial deployments. |
| MSL Level 1 (260 °C peak) | Supports standard SMT reflow profiles without preconditioning; eliminates moisture-related popcorning risk in high-volume manufacturing. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine bay environments exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS clamping transient spikes on 5 V sensor supply and 0–5 V analog outputs to prevent ADC saturation or op-amp latch-up. Use Value: Clamps to ≤53.9 V within nanoseconds, keeping downstream signal conditioning circuitry within its 6 V absolute maximum rating while maintaining AEC-Q101 compliance. |
Use Scenario: Safeguarding 24 V digital input channels in programmable logic controllers subjected to inductive kickback from solenoid valves and relay coils. IC Role / Device Role / Timing Role: Fast-acting shunt suppressor placed between input terminal and chassis ground, triggered only during >33.3 V transients. Use Value: Limits voltage excursion to 53.9 V at 7.4 A, preventing damage to optocoupler input stages and enabling reliable operation under repeated 400 W surge events. |
| Telecom Line Interface Protection | Consumer Device USB Port Protection |
Use Scenario: Shielding RS-485 transceiver pins in base station backhaul equipment from lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Primary-level unidirectional clamp on VCC and data lines, coordinated with secondary GDT or polymer PTC devices. Use Value: Provides <1 µA leakage at 33.3 V to avoid signal distortion, while clamping 10/1000 µs surges to 53.9 V - compatible with UL 497B Class B telecom protector requirements. |
Use Scenario: Adding overvoltage resilience to USB 2.0 VBUS lines in smart home hubs exposed to accidental 12 V adapter misconnection or ESD events. IC Role / Device Role / Timing Role: Standoff-rated TVS on 5 V rail upstream of USB controller IC, activated only above 33.3 V to avoid interfering with normal 4.75–5.25 V operation. Use Value: Delivers 400 W surge capacity in SMA footprint, enabling compact layout without sacrificing clamping performance or introducing forward voltage drop in normal operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A-E3/5A | Lower VWM (28.2 V), lower VC (48.4 V at 7.3 A), same 400 W PPPM and SMA package. | Better suited for 3.3 V or 5 V rail protection where tighter clamping margin is required. | Select SMAJ33A-E3/5A when protecting sub-30 V circuits needing lower clamping voltage; P4SMA39AHE3/5A preferred for 24–36 V systems. |
| 1.5SMC39A | Higher package thermal resistance (RθJA ≈ 150 °C/W), same VWM/VC specs, but DO-214AB (SMB) package - larger footprint and higher profile. | Used where board space allows larger SMB package and higher surge repetition is not required. | Choose 1.5SMC39A only if existing layout uses SMB pads; P4SMA39AHE3/5A offers superior thermal performance and smaller SMA footprint for new designs. |
Compared with SMAJ33A-E3/5A and 1.5SMC39A, P4SMA39AHE3/5A provides optimal balance of AEC-Q101 qualification, low-profile SMA packaging, and 33.3 V standoff for 24 V industrial and automotive subsystems - delivering verified clamping performance without layout compromise or derating penalties.
Availability
P4SMA39AHE3/5A is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, and telecom line interface designs requiring stable component supply, AEC-Q101 traceability, and consistent surge immunity across production batches.
Supply support for P4SMA39AHE3/5A 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, 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 harsh environments - targeting automotive, industrial, and telecom applications where AEC-Q101 validation, low leakage, and precise clamping are mandatory design requirements.
FAQ
What is the clamping voltage of P4SMA39AHE3/5A at its rated peak pulse current?
The P4SMA39AHE3/5A 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 with the device mounted on 0.2" × 0.2" copper pads per JEDEC standards and defines the upper voltage limit imposed on protected circuitry during surge events. The P4SMA39AHE3/5A maintains this clamping performance across its full operating temperature range.
Is P4SMA39AHE3/5A qualified for automotive applications?
Yes, P4SMA39AHE3/5A is AEC-Q101 qualified, as confirmed by the "HE3" suffix in its ordering code. This qualification covers stress tests including high-temperature reverse bias (HTRB), temperature cycling, and ESD robustness - making P4SMA39AHE3/5A suitable for use in engine control units, body electronics, and ADAS sensor modules where automotive-grade reliability is mandated.
What does the "/5A" suffix indicate in P4SMA39AHE3/5A?
The "/5A" suffix in P4SMA39AHE3/5A denotes the packaging configuration: 13-inch diameter plastic tape and reel containing 7500 units. This format supports high-volume automated SMT placement and is distinct from the "/61" option (7-inch reel, 1800 units). The "HE3" portion confirms RoHS-compliant, AEC-Q101-qualified construction, while "A" indicates unidirectional polarity.
How does P4SMA39AHE3/5A differ from bidirectional variants like P4SMA39CA?
P4SMA39AHE3/5A is unidirectional, with polarity marked by a cathode band and intended for DC line protection (e.g., 24 V supply rails), whereas P4SMA39CA is bidirectional and used for AC or differential signal lines (e.g., RS-485). Their electrical characteristics differ: P4SMA39AHE3/5A has VWM = 33.3 V and VBR = 37.1–41.0 V, while P4SMA39CA specifies symmetric VWM/VBR in both directions. The P4SMA39AHE3/5A cannot substitute for P4SMA39CA in AC-coupled applications.
What is the thermal resistance of P4SMA39AHE3/5A, and how does it affect PCB layout?
P4SMA39AHE3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on minimum recommended pad layout (0.2" × 0.2" copper per terminal). To maintain safe junction temperatures under repetitive surges, designers must ensure adequate copper area and avoid thermal isolation. Increasing pad size or adding thermal vias reduces RθJA - critical for applications exceeding 0.01% duty cycle or ambient temperatures above 70 °C. The P4SMA39AHE3/5A's RθJA directly impacts its sustainable power dissipation in real-world layouts.
P4SMA39AHE3/5A 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:
- 1
- Bidirectional Channels:
- -
- 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)
P4SMA39AHE3/5A FAQ
1.How can I place an order for P4SMA39AHE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA39AHE3/5A 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 P4SMA39AHE3/5A reliable?
The price and inventory of P4SMA39AHE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA39AHE3/5A is usually 5 days.
3.What payment methods are accepted for P4SMA39AHE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA39AHE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA39AHE3/5A?
P4SMA39AHE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA39AHE3/5A 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 P4SMA39AHE3/5A?
For technical support, including P4SMA39AHE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA39AHE3/5A requirements.
6.How does Aetrix verify that P4SMA39AHE3/5A is sourced from the original manufacturer or authorized distributors?
All P4SMA39AHE3/5A 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 P4SMA39AHE3/5A meets industry standards.
7.What is the process for return or replacement of P4SMA39AHE3/5A?
All P4SMA39AHE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA39AHE3/5A, 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 P4SMA39AHE3/5A part is unused and in its original packaging.
Return procedure for P4SMA39AHE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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