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Vishay General Semiconductor - Diodes Division 1.5SMC30A-M3/9AT
- Part No.:
- 1.5SMC30A-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC30A-M3/9AT.pdf
- Description:
- TVS DIODE 25.6VWM 41.4VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:7,267
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Product details
Overview
1.5SMC30A-M3/9AT from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection in power and signal lines. It features a 30 V breakdown voltage (VBR = 28.5–31.5 V at 1.0 mA), 25.6 V stand-off voltage (VWM), clamps to ≤41.4 V at 36.2 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 1.5SMC30A-M3/9AT datasheet, 1.5SMC30A-M3/9AT pinout, 1.5SMC30A-M3/9AT application, or 1.5SMC30A-M3/9AT equivalent, this device is evaluated for high-reliability transient suppression in automotive power rails, industrial I/O protection, and telecom interface circuits where low clamping voltage, fast response (<1 ns), and halogen-free RoHS compliance are critical selection criteria.
Technical Context
The 1.5SMC30A-M3/9AT operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to achieve stable reverse breakdown and low incremental surge resistance. Its clamping behavior is defined under standardized 10/1000 μs double-exponential surge conditions, with thermal derating applied above TA = 25 °C per Figure 2 of the datasheet.
It is rated for TJ = –65 to +150 °C operation, exhibits a VBR temperature coefficient of +0.097 %/°C, and meets J-STD-020 MSL Level 1 with peak reflow temperature up to 260 °C - confirming suitability for standard SMT assembly without moisture sensitivity concerns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 28.5 V / 31.5 V at 1.0 mA - defines precise avalanche onset range for predictable turn-on during overvoltage events |
| VWM | 25.6 V - maximum continuous reverse operating voltage before leakage exceeds 1.0 μA |
| VC @ IPPM | ≤41.4 V at 36.2 A - clamping voltage under 1500 W 10/1000 μs surge, directly limiting stress on downstream components |
| PPPM | 1500 W - peak pulse power handling capability with 0.01 % duty cycle, enabling repeated surge absorption |
| IFSM | 200 A - non-repetitive forward surge rating (8.3 ms half-sine), supporting inrush current tolerance in power rail applications |
| TJ max. | +150 °C - maximum junction temperature, enabling operation in under-hood automotive or high-ambient industrial environments |
| Package | SMC (DO-214AB) - industry-standard surface-mount outline with 8.0 mm × 8.0 mm copper pad requirement for thermal performance |
Pinout & Package
Package: SMC (DO-214AB), molded plastic case with matte tin-plated leads; polarity indicated by cathode band on unidirectional devices; compliant with UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional TVS configuration |
| Cathode | Avalanche breakdown terminal | Connected to protected line (e.g., 24 V rail or signal input); band-marked end enables automated optical inspection |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power | Enables protection against severe transients like ISO 7637-2 Pulse 5a (load dump) in 12 V automotive systems |
| Low clamping ratio (VC/VBR ≈ 1.34) | Minimizes voltage overshoot during clamping, reducing risk of latch-up or damage to 3.3 V/5 V logic interfaces |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets environmental compliance requirements for export-controlled and green electronics programs |
| MSL Level 1, 260 °C peak reflow | Eliminates pre-baking requirement and supports single-pass reflow in high-volume manufacturing |
| Glass-passivated junction | Ensures long-term stability of VBR and low leakage (<1 μA at VWM) across temperature and lifetime |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 24 V supply lines in engine control units (ECUs) from load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC input to clamp transients before they reach regulator ICs. Use Value: Clamps to ≤41.4 V under 36.2 A surge, preventing regulator overvoltage failure while maintaining system uptime. |
Use Scenario: Shielding analog inputs of PLC analog I/O modules from ESD and field-wiring induced surges. IC Role / Device Role / Timing Role: Front-end transient suppressor on 4–20 mA current loop or 0–10 V sensor lines. Use Value: Sub-1 ns response time limits transient energy transfer, preserving ADC accuracy and preventing microcontroller reset. |
| Telecom Line Interface Protection | Consumer Power Adapter Output Protection |
|
Use Scenario: Safeguarding Ethernet PHY power pins (e.g., PoE midspan injectors) against lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Secondary-level TVS on isolated DC output rails feeding PHY ICs. Use Value: 1500 W rating handles IEC 61000-4-5 Level 4 (4 kV) surges when combined with primary GDT or MOV staging. |
Use Scenario: Overvoltage protection on the 5 V/9 V/12 V USB-C PD output of wall adapters after secondary-side rectification. IC Role / Device Role / Timing Role: Final-stage clamping device parallel to output capacitor, shunting fault energy away from connected devices. Use Value: Low VWM (25.6 V) ensures no interference with normal regulation, while VC ≤41.4 V prevents USB-PD controller latch-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ30A-E3/52T | Same VBR range (28.5–31.5 V), but SMB package (DO-214AA); 600 W PPPM, lower IPPM (24.9 A) | Lower power handling suits space-constrained consumer ports, not automotive load dump | Select when board area is limited and surge severity is ≤IEC 61000-4-5 Level 2 |
| 1.5KE30A-T | Through-hole DO-201 package; identical electrical specs but higher RθJA (100 °C/W vs. 75 °C/W) and no MSL 1 rating | Not suitable for automated SMT lines; requires wave solder or hand assembly | Choose only for legacy through-hole designs or prototyping where reflow compatibility is unnecessary |
Compared with SMBJ30A-E3/52T and 1.5KE30A-T, the 1.5SMC30A-M3/9AT provides superior surge robustness in surface-mount form, enabling direct integration into high-reliability automotive and industrial PCBs without layout redesign or thermal derating penalties.
Availability
1.5SMC30A-M3/9AT is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor conditioning, and telecom interface protection requiring stable component supply, halogen-free compliance, and AEC-Q101-grade reliability assurance.
Supply support for 1.5SMC30A-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, MOSFETs, and protection devices with emphasis on high-reliability, high-efficiency, and automotive-qualified solutions.
The 1.5SMC Series was developed specifically for surface-mount transient suppression in harsh-environment applications, combining high-power surge capability with automated assembly compatibility and extended temperature operation.
FAQ
What is the clamping voltage of the 1.5SMC30A-M3/9AT under maximum surge conditions?
The 1.5SMC30A-M3/9AT clamps to a maximum of 41.4 V when subjected to its rated 36.2 A peak pulse current (IPPM) under a 10/1000 μs waveform. This value is measured per Figure 1 in the Vishay datasheet 88303 and represents the upper limit of voltage seen by downstream circuitry during worst-case transient events - critical for verifying margin against IC absolute maximum ratings.
Is the 1.5SMC30A-M3/9AT suitable for automotive applications?
Yes, the 1.5SMC30A-M3/9AT is halogen-free and RoHS-compliant (M3 suffix), and the base 1.5SMC30A is AEC-Q101 qualified when ordered with HE3 or HM3 suffixes. While the -M3/9AT variant itself is commercial-grade, its electrical specs, thermal rating (TJ = 150 °C), and MSL Level 1 reflow compatibility align with automotive subsystem requirements - especially for non-safety-critical power rail protection where full qualification is managed at the module level.
What does the "/9AT" suffix indicate in 1.5SMC30A-M3/9AT?
The "/9AT" suffix denotes packaging: 3500 units per 13-inch diameter plastic tape-and-reel. This format supports high-speed pick-and-place assembly and is distinct from "/57T" (850 units on 7-inch reel). The "M3" prefix confirms halogen-free, RoHS-compliant construction - essential for compliance-driven production programs in Europe and Asia.
How does the 1.5SMC30A-M3/9AT compare to bidirectional TVS diodes like 1.5SMC30CA?
The 1.5SMC30A-M3/9AT is unidirectional and intended for DC line protection where polarity is fixed (e.g., +24 V rail to ground), offering lower leakage and tighter VBR tolerance than its bidirectional counterpart 1.5SMC30CA. The latter supports AC or polarity-agnostic signals but exhibits higher reverse leakage and symmetric clamping - making the 1.5SMC30A-M3/9AT preferable for regulated DC power paths where leakage and precision clamping matter most.
What is the thermal resistance of the 1.5SMC30A-M3/9AT, and how does it affect layout?
The 1.5SMC30A-M3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. To maintain safe junction temperatures under sustained power dissipation, PCB layout must allocate adequate copper area and avoid thermal isolation - especially important in high-temperature environments like engine compartments or enclosed industrial enclosures.
1.5SMC30A-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):
- 25.6V
- Voltage - Breakdown (Min):
- 28.5V
- Voltage - Clamping (Max) @ Ipp:
- 41.4V
- Current - Peak Pulse (10/1000µs):
- 36.2A
- 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)
1.5SMC30A-M3/9AT FAQ
1.How can I place an order for 1.5SMC30A-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC30A-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 1.5SMC30A-M3/9AT reliable?
The price and inventory of 1.5SMC30A-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 1.5SMC30A-M3/9AT is usually 5 days.
3.What payment methods are accepted for 1.5SMC30A-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC30A-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC30A-M3/9AT?
1.5SMC30A-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC30A-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 1.5SMC30A-M3/9AT?
For technical support, including 1.5SMC30A-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC30A-M3/9AT requirements.
6.How does Aetrix verify that 1.5SMC30A-M3/9AT is sourced from the original manufacturer or authorized distributors?
All 1.5SMC30A-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 1.5SMC30A-M3/9AT meets industry standards.
7.What is the process for return or replacement of 1.5SMC30A-M3/9AT?
All 1.5SMC30A-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC30A-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 1.5SMC30A-M3/9AT part is unused and in its original packaging.
Return procedure for 1.5SMC30A-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC30A-M3/9AT Tags
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