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Vishay General Semiconductor - Diodes Division TPSMA39AHE3_A/I
- Part No.:
- TPSMA39AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
TPSMA39AHE3_A/I.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,133
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Product details
Overview
TPSMA39AHE3_A/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal lines. It features a 39.0 V nominal breakdown voltage (VBR), 53.9 V maximum clamping voltage (VC) at 7.4 A peak pulse current, 400 W peak pulse power (10/1000 µs), 185 °C maximum junction temperature, and AEC-Q101 qualification - used in automotive power rail protection and industrial sensor interface circuits.
For engineers reviewing the TPSMA39AHE3_A/I datasheet, TPSMA39AHE3_A/I pinout, TPSMA39AHE3_A/I application, or TPSMA39AHE3_A/I equivalent, key selection criteria include unidirectional polarity, 33.3 V stand-off voltage (VWM), low 1.0 µA reverse leakage at VWM, MSL Level 1 moisture sensitivity, and RoHS-compliant matte tin-plated terminals suitable for lead-free reflow.
Technical Context
This TVS diode operates as a voltage-clamping device using passivated anisotropic rectifier technology, with avalanche breakdown triggered above its 39.0 V nominal VBR. Its 10/1000 µs waveform response delivers 7.4 A peak pulse current (IPPM) while limiting transient voltage to ≤53.9 V - critical for protecting downstream MOSFETs and ICs from inductive switching spikes.
Thermal design is enabled by its 185 °C maximum junction temperature rating and derating curve per Figure 2, supporting operation in under-hood automotive environments. The device meets JESD201 Class 2 whisker resistance and is qualified to AEC-Q101, confirming suitability for automotive-grade reliability requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (Nominal) | 39.0 V - precise avalanche breakdown threshold ensuring consistent clamping onset across production lots |
| VC @ IPPM | 53.9 V - maximum clamped voltage during 7.4 A transient, defining protected circuit's worst-case overvoltage stress |
| VWM | 33.3 V - maximum continuous working voltage; must exceed system DC rail to prevent leakage-induced power loss |
| PPPM | 400 W - peak surge power handling capability with 10/1000 µs waveform, enabling robust lightning/ESD immunity |
| TJ max. | 185 °C - high-temperature junction rating allowing placement near heat sources in automotive ECUs |
| IR @ VWM | 1.0 µA - ultra-low reverse leakage at stand-off voltage, minimizing standby current in battery-powered systems |
| Polarity | Unidirectional - blocks reverse conduction only; requires correct orientation relative to protected line polarity |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, cathode indicated by color band. Dimensions: 4.93 mm × 3.99 mm × 2.29 mm (L × W × H), with 5.0 mm × 5.0 mm copper pad layout recommended for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to lower-potential side of protected line; defines directionality for unidirectional clamping |
| Cathode | Current exit point during forward conduction; marked by band | Connected to higher-potential side; determines polarity alignment for proper transient shunting path |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier process ensures stable VBR tolerance (±5%) and long-term reliability under thermal cycling |
| AEC-Q101 qualification | Validated for automotive applications including engine control modules and body electronics requiring zero-failure field performance |
| MSL Level 1 | Zero floor life limitation - can be stored indefinitely before reflow without baking, simplifying SMT logistics |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (<1 ns), improving protection margin for high-speed interfaces |
| Matte tin plating | Ensures solderability per J-STD-002 and eliminates tin whisker risk per JESD201 Class 2 for mission-critical systems |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Suppressing load-dump transients (up to 60 V, 100 ms) on 12 V battery-fed microcontroller power inputs in vehicle body control modules. IC Role / Device Role / Timing Role: Voltage-clamping TVS placed between VIN and GND, conducting only during overvoltage events to divert surge energy away from LDO and MCU. Use Value: Limits peak voltage to 53.9 V, preventing latch-up or permanent damage to 3.3 V/5 V logic rails while maintaining <1.0 µA leakage during normal operation. | Use Scenario: Protecting analog output pins (e.g., 4–20 mA current loop drivers) in factory automation sensors exposed to ESD and cable discharge events. IC Role / Device Role / Timing Role: Unidirectional shunt element connected between signal line and ground, clamping fast transients before they reach precision DAC or op-amp output stages. Use Value: Responds in <1 ns to 8 kV contact ESD (IEC 61000-4-2), holding voltage below 53.9 V to preserve ±0.1% accuracy of 16-bit analog outputs. |
| Telecom DC Power Input Protection | Consumer Device USB Port Surge Suppression |
Use Scenario: Safeguarding 48 V PoE-powered network switches against induced surges from nearby AC mains or lightning coupling. IC Role / Device Role / Timing Role: Primary clamping device on DC input rail upstream of DC-DC converters, sized for 400 W peak dissipation per IEEE 802.3bt surge test profiles. Use Value: Withstands repetitive 10/1000 µs surges at 0.01% duty cycle, enabling compliance with IEC 61000-4-5 Level 3 (2 kV line-earth) without derating. | Use Scenario: Adding secondary-level surge protection on VBUS line of USB-C ports in portable monitors and docking stations. IC Role / Device Role / Timing Role: Fast-response TVS placed after primary fuse and upstream of USB PD controller, absorbing residual transients that bypass front-end filters. Use Value: Clamps 15 kV air-gap ESD to ≤53.9 V within nanoseconds, preventing false disconnects or firmware resets in USB enumeration sequences. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ39A | Same SMA package, 39 V VBR, but rated for 400 W PPPM with 10/1000 µs waveform and 150 °C TJ max. - lacks AEC-Q101 qualification | Not approved for automotive under-hood use; suitable for industrial/commercial power supplies where qualification is not mandated | Select SMAJ39A when cost sensitivity outweighs automotive qualification requirements and thermal margin above 150 °C is not needed |
| TPSMA39AHM3_A/I | Identical electrical specs and AEC-Q101 qualification, but halogen-free molding compound and JESD201 Class 2 whisker resistance - same pinout and footprint | Required for RoHS + halogen-free compliance programs (e.g., EU automotive Tier 1 supply chains); no functional difference in circuit behavior | Choose TPSMA39AHM3_A/I when material compliance (halogen-free, enhanced whisker resistance) is contractually required |
Compared with SMAJ39A and TPSMA39AHM3_A/I, the TPSMA39AHE3_A/I provides identical clamping performance and automotive qualification but uses standard RoHS-compliant (non-halogen-free) epoxy - making it optimal for cost-sensitive AEC-Q101 applications where halogen-free status is not mandated.
Availability
TPSMA39AHE3_A/I is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and telecom power input circuits requiring stable component supply, AEC-Q101 validation, and long-term lifecycle support.
Supply support for TPSMA39AHE3_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, TVS devices, and optoelectronics with emphasis on high-reliability, high-temperature, and automotive-grade solutions.
The TPSMA39AHE3_A/I belongs to Vishay's PAR® (Protected Avalanche Rectifier) family of transient voltage suppressors, engineered specifically for robust ESD and surge protection in harsh-environment applications including automotive, industrial, and telecom infrastructure.
FAQ
What is the breakdown voltage tolerance for TPSMA39AHE3_A/I?
The TPSMA39AHE3_A/I has a nominal breakdown voltage (VBR) of 39.0 V with a guaranteed range of 37.1 V (min) to 41.0 V (max) at 1.0 mA test current, corresponding to ±5% tolerance. This tight VBR distribution ensures predictable clamping behavior across production batches and supports reliable overvoltage margin design in safety-critical systems like automotive ECUs.
Is TPSMA39AHE3_A/I suitable for bidirectional transient protection?
No, the TPSMA39AHE3_A/I is unidirectional only - it conducts in reverse bias above VBR but blocks forward current beyond ~3.5 V. For bidirectional protection (e.g., AC signal lines or USB D+/D−), a dual-diode configuration or dedicated bidirectional TVS such as SMBJ33CA would be required. Using TPSMA39AHE3_A/I on bidirectional paths risks forward conduction and improper clamping.
What is the maximum operating temperature for TPSMA39AHE3_A/I?
The TPSMA39AHE3_A/I supports an operating junction temperature range of -65 °C to +185 °C. Its 185 °C TJ max. enables deployment in high-temperature zones such as engine compartments or enclosed industrial enclosures without thermal derating penalties up to that limit - verified per AEC-Q101 stress testing protocols.
Does TPSMA39AHE3_A/I require PCB layout changes compared to standard SMA diodes?
No, the TPSMA39AHE3_A/I uses the industry-standard SMA (DO-214AC) package with identical mechanical dimensions and pad layout recommendations (0.2" × 0.2" copper pads per terminal). Its footprint, soldering profile, and thermal design rules match legacy SMA diodes - enabling drop-in replacement in existing designs without layout revision.
How does the clamping voltage of TPSMA39AHE3_A/I compare to its breakdown voltage?
The TPSMA39AHE3_A/I clamps at 53.9 V (VC) when subjected to its rated 7.4 A peak pulse current (IPPM), which is 38% above its 39.0 V nominal VBR. This VC/VBR ratio reflects low dynamic impedance and efficient energy diversion - critical for protecting downstream components with voltage margins below 55 V, such as automotive CAN transceivers or industrial ADC front-ends.
TPSMA39AHE3_A/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- PAR®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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 ~ 185°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
TPSMA39AHE3_A/I FAQ
1.How can I place an order for TPSMA39AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for TPSMA39AHE3_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 TPSMA39AHE3_A/I reliable?
The price and inventory of TPSMA39AHE3_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 TPSMA39AHE3_A/I is usually 5 days.
3.What payment methods are accepted for TPSMA39AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPSMA39AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPSMA39AHE3_A/I?
TPSMA39AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPSMA39AHE3_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 TPSMA39AHE3_A/I?
For technical support, including TPSMA39AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPSMA39AHE3_A/I requirements.
6.How does Aetrix verify that TPSMA39AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All TPSMA39AHE3_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 TPSMA39AHE3_A/I meets industry standards.
7.What is the process for return or replacement of TPSMA39AHE3_A/I?
All TPSMA39AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with TPSMA39AHE3_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 TPSMA39AHE3_A/I part is unused and in its original packaging.
Return procedure for TPSMA39AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TPSMA39AHE3_A/I Tags
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