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Vishay General Semiconductor - Diodes Division 1.5SMC39A-M3/9AT
- Part No.:
- 1.5SMC39A-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC39A-M3/9AT.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC SMC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
1.5SMC39A-M3/9AT from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection in power and signal lines. It features a 39 V breakdown voltage (VBR = 37.1–41.0 V at 1 mA), 33.3 V stand-off voltage (VWM), clamps to ≤53.9 V at 27.8 A peak pulse current, and delivers 1500 W peak pulse power with a 10/1000 µs waveform - used to safeguard MOSFETs, ICs, and sensor interfaces against lightning-induced transients and inductive switching surges.
For engineers reviewing the 1.5SMC39A-M3/9AT datasheet, 1.5SMC39A-M3/9AT pinout, 1.5SMC39A-M3/9AT application, or 1.5SMC39A-M3/9AT equivalent, this device is evaluated for high-reliability surge suppression in automotive ECUs, industrial PLC I/O modules, and telecom line-card front-ends where low clamping voltage, fast response (<1 ns), and AEC-Q101-compliant halogen-free construction are critical selection criteria.
Technical Context
The 1.5SMC39A-M3/9AT operates as a unidirectional avalanche diode, leveraging glass-passivated silicon junction technology to achieve sub-nanosecond response to ESD and surge events. Its clamping behavior is defined by a well-controlled dynamic impedance (low incremental surge resistance), enabling precise voltage limiting during repetitive 10/1000 µs transients at 0.01% duty cycle.
Thermally, it uses an SMC (DO-214AB) package with RθJA = 75 °C/W and RθJL = 15 °C/W, supporting operation from –65 °C to +150 °C junction temperature. The cathode-band polarity marking ensures correct orientation in series-connected protection circuits, and its matte tin-plated leads comply with J-STD-002 solderability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 37.1 V / 41.0 V at 1 mA - defines reliable avalanche initiation threshold for consistent clamping onset |
| VWM | 33.3 V - maximum continuous reverse operating voltage before leakage exceeds 1 µA |
| VC @ IPPM | ≤53.9 V at 27.8 A - clamping voltage under 1500 W 10/1000 µs surge, directly limiting stress on downstream ICs |
| PPPM | 1500 W - peak pulse power handling capacity, validated per Fig. 1 derating curve up to TA = 125 °C |
| IFSM | 200 A - non-repetitive forward surge rating (8.3 ms half-sine), supports inrush current immunity in DC power rails |
| TJ max | +150 °C - enables deployment in under-hood automotive and high-temperature industrial environments |
| Package | SMC (DO-214AB) - surface-mount outline with 8.0 mm × 8.0 mm copper pad thermal design, MSL Level 1 compliant |
Pinout & Package
Package: SMC (DO-214AB), molded epoxy case meeting UL 94 V-0 flammability rating; matte tin-plated leads; cathode indicated by band marking on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to protected circuit ground or low-side return path | Enables standard series connection between power rail and load - reverse-biased during normal operation |
| Cathode | Current exit terminal in forward bias; marked with band; connected toward power source or signal line | Defines polarity-sensitive placement: cathode faces higher potential side to ensure proper avalanche conduction during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 µs) | Supports IEC 61000-4-5 Level 4 (4 kV) surge immunity without external heat sinking when mounted per recommended pad layout |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes voltage overshoot across protected ICs - critical for 3.3 V/5 V logic and automotive microcontrollers |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets automotive and industrial environmental compliance requirements including JESD201 Class 2 whisker resistance |
| Fast response time (<1 ns) | Clamps transients before propagation into sensitive analog or digital circuitry - verified via TLP testing |
| AEC-Q101 qualified option available | Variant 1.5SMC39AHM3_A/I meets stress test requirements for automotive electronics (HTOL, TC, AC/DC life tests) |
Applications
| Automotive Power Distribution Module | Industrial PLC Analog Input Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed control logic from load-dump transients (ISO 16750-2, 35 V/100 ms) and alternator ripple. IC Role / Device Role: Primary TVS clamp placed upstream of LDO regulators and CAN transceivers. Use Value: Clamps to 53.9 V at 27.8 A, preventing latch-up or gate oxide damage in downstream 3.3 V/5 V MCUs and drivers. |
Use Scenario: Shielding 4–20 mA current-loop inputs from field-wiring induced surges in factory automation cabinets. IC Role / Device Role: Unidirectional shunt protector across input terminals, coordinated with series current-limiting resistor. Use Value: Low VWM (33.3 V) avoids false triggering during normal loop operation while suppressing >1 kV transients. |
| Telecom Line Card Surge Protection | Consumer Appliance Motor Drive Interface |
|
Use Scenario: Front-end protection for Ethernet PHY power rails and auxiliary bias supplies exposed to lightning-induced surges (IEC 61000-4-5). IC Role / Device Role: Secondary-level TVS after gas discharge tube (GDT) primary stage in hybrid protection network. Use Value: Fast response and low VC ensure secondary clamping occurs before GDT follow-on current damages PHY ICs. |
Use Scenario: Safeguarding microcontroller GPIOs and gate drivers controlling BLDC motors in smart home appliances. IC Role / Device Role: Localized TVS on motor driver supply pins and feedback signal lines subject to back-EMF spikes. Use Value: 200 A IFSM rating withstands repeated commutation surges; SMC package allows automated placement near motor connectors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ39A-E3/52T | Lower peak power (600 W), SMB package (smaller footprint, higher RθJA = 85 °C/W) | Suitable for space-constrained consumer PCBs with lower surge severity (IEC 61000-4-2 only) | Select when board area is limited and full 1500 W capability is not required; verify thermal margin at 85 °C ambient |
| 1.5KE39A-T | Through-hole DO-201 package, identical electrical specs but no halogen-free or AEC-Q101 variants | Used in legacy industrial power supplies where reworkability and manual assembly are prioritized | Choose for cost-sensitive, non-automated production or where through-hole mounting improves mechanical robustness in high-vibration environments |
Compared with 1.5SMC39A-M3/9AT, SMBJ39A-E3/52T trades surge capacity for compactness, while 1.5KE39A-T offers identical clamping performance in a serviceable through-hole form - neither is pin-compatible, requiring layout changes, but both serve overlapping protection functions in less demanding or legacy designs.
Availability
1.5SMC39A-M3/9AT is available at Aetrix Electronics and suitable for automotive ECU power rails, industrial PLC analog I/O protection, and telecom line-card surge suppression requiring stable component supply, halogen-free compliance, and AEC-Q101 qualification path support.
Supply support for 1.5SMC39A-M3/9AT 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, thermal performance, and automotive-grade qualification.
The 1.5SMC Series was developed for high-power, surface-mount transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where compact size, repeatable clamping, and long-term stability under thermal cycling are essential.
FAQ
What is the maximum clamping voltage of the 1.5SMC39A-M3/9AT under a 10/1000 µs surge?
The 1.5SMC39A-M3/9AT clamps to a maximum of 53.9 V when subjected to its rated peak pulse current of 27.8 A using a 10/1000 µs waveform. This value is measured per Figure 1 in the Vishay datasheet (Document Number: 88303) and reflects worst-case dynamic impedance under standardized surge conditions - critical for verifying safe operating margins of downstream 3.3 V or 5 V ICs protected by the 1.5SMC39A-M3/9AT.
Is the 1.5SMC39A-M3/9AT halogen-free and RoHS-compliant?
Yes, the "M3" suffix in 1.5SMC39A-M3/9AT explicitly denotes halogen-free, RoHS-compliant construction per Vishay's material categorization standard (www.vishay.com/doc?99912). It also meets JESD201 Class 2 whisker resistance and is rated MSL Level 1 (peak reflow temperature 260 °C), making the 1.5SMC39A-M3/9AT suitable for lead-free assembly and environmentally regulated applications.
Does the 1.5SMC39A-M3/9AT have AEC-Q101 qualification?
The base 1.5SMC39A-M3/9AT is commercial-grade; however, the AEC-Q101 qualified variant is designated 1.5SMC39AHM3_A/I (with "HM3" and revision code "A"). That part shares identical electrical specs and SMC packaging but undergoes extended stress testing per AEC-Q101 - so while the 1.5SMC39A-M3/9AT itself is not qualified, its HM3 automotive derivative is fully documented and available for automotive designs requiring certified components.
What is the thermal resistance junction-to-ambient for the 1.5SMC39A-M3/9AT?
The 1.5SMC39A-M3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on the minimum recommended 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal, as specified in the Vishay 1.5SMC Series datasheet. This value assumes still air conditions and is used to calculate allowable power dissipation at elevated ambient temperatures - essential for thermal design validation of the 1.5SMC39A-M3/9AT in enclosed enclosures.
How does the 1.5SMC39A-M3/9AT differ from bidirectional TVS diodes like 1.5SMC39CA?
The 1.5SMC39A-M3/9AT is unidirectional and features a cathode band for polarity-specific installation, enabling use in DC circuits where reverse leakage must be minimized. In contrast, 1.5SMC39CA is bidirectional with symmetrical clamping in both directions and no polarity marking - suited for AC signal lines or differential buses. Their VBR, VWM, and VC values differ accordingly: 1.5SMC39A-M3/9AT has VWM = 33.3 V, while 1.5SMC39CA has VWM = 33.3 V only in each direction, with distinct breakdown symmetry - confirming they are not interchangeable without circuit review.
1.5SMC39A-M3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- 1.5SMC, TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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):
- 27.8A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
1.5SMC39A-M3/9AT FAQ
1.How can I place an order for 1.5SMC39A-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC39A-M3/9AT 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 1.5SMC39A-M3/9AT reliable?
The price and inventory of 1.5SMC39A-M3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC39A-M3/9AT is usually 5 days.
3.What payment methods are accepted for 1.5SMC39A-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC39A-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC39A-M3/9AT?
1.5SMC39A-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC39A-M3/9AT 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 1.5SMC39A-M3/9AT?
For technical support, including 1.5SMC39A-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC39A-M3/9AT requirements.
6.How does Aetrix verify that 1.5SMC39A-M3/9AT is sourced from the original manufacturer or authorized distributors?
All 1.5SMC39A-M3/9AT 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 1.5SMC39A-M3/9AT meets industry standards.
7.What is the process for return or replacement of 1.5SMC39A-M3/9AT?
All 1.5SMC39A-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC39A-M3/9AT, 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 1.5SMC39A-M3/9AT part is unused and in its original packaging.
Return procedure for 1.5SMC39A-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC39A-M3/9AT Tags
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