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Vishay General Semiconductor - Diodes Division SMAJ150A-M3/5A
- Part No.:
- SMAJ150A-M3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ150A-M3/5A.pdf
- Description:
- TVS DIODE 150VWM 243VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ150A-M3/5A from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection in DC power rails and signal lines. It features a 150 V stand-off voltage (VWM), 167–185 V breakdown voltage (VBR) at 1 mA, clamps transients to ≤243 V at 1.2 A peak pulse current (IPPM), and delivers 400 W peak pulse power (10/1000 μs waveform). It is deployed in automotive power supply inputs, industrial sensor interfaces, and telecom line protection where fast response and low clamping voltage are critical.
For engineers reviewing the SMAJ150A-M3/5A datasheet, SMAJ150A-M3/5A pinout, SMAJ150A-M3/5A application, or SMAJ150A-M3/5A equivalent, this device offers verified unidirectional surge suppression with AEC-Q101-qualified variants available, halogen-free RoHS compliance (M3 suffix), SMA (DO-214AC) surface-mount package, and validated thermal resistance (RθJA = 120 °C/W).
Technical Context
This TVS diode operates as a clamping device in parallel with protected circuitry, entering avalanche conduction when reverse voltage exceeds VBR. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1.0 μA at VWM), while its low incremental surge resistance enables effective energy diversion during ESD or lightning-induced transients.
The SMAJ150A-M3/5A is rated for repetitive 10/1000 μs surges at 0.01% duty cycle (400 W up to 78 V; derated to 300 W above 78 V), supports operating junction temperatures from –55 °C to +150 °C, and meets MSL Level 1 per J-STD-020 with 260 °C lead-free reflow compatibility.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 150 V - Maximum continuous reverse operating voltage before significant leakage begins; defines safe DC rail margin. |
| VBR (Breakdown Voltage) | 167–185 V at 1 mA - Confirmed avalanche onset range; ensures reliable triggering above normal operating voltage. |
| VC (Clamping Voltage) | ≤243 V at IPPM = 1.2 A - Peak voltage seen by protected circuit during standardized 10/1000 μs surge; determines stress on downstream ICs. |
| PPPM (Peak Pulse Power) | 400 W (10/1000 μs) - Energy-handling capacity under industry-standard surge waveform; derates to 300 W above 78 V. |
| IFSM (Surge Current) | 40 A (8.3 ms half-sine) - Single-event forward surge rating; validates robustness against inrush or fault currents. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads; informs board-level thermal design. |
| Package | SMA (DO-214AC) - Low-profile, surface-mount package with matte tin-plated leads; compatible with automated placement and J-STD-002 soldering. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with cathode band marking; dimensions: 4.50 mm × 2.79 mm × 2.29 mm (L × W × H); meets UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / low-side connection | Connected to ground or lower-potential node in unidirectional configuration; forms current path during clamping. |
| Cathode | Reverse voltage sensing / high-side connection | Marked with band; connected to protected line (e.g., 150 V rail); avalanche conduction initiates here during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables protection against IEC 61000-4-5 Level 3 surges (1 kV/2 Ω) on 150 V systems without external series impedance. |
| Low clamping ratio (VC/VBR ≈ 1.46) | Minimizes voltage overshoot across protected ICs-critical for 150 V-rated MOSFETs or gate drivers. |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets environmental compliance requirements for automotive and industrial end equipment without compromising surge performance. |
| MSL Level 1, 260 °C peak reflow | Supports single-pass lead-free assembly without moisture-related popcorning or delamination risks. |
| AEC-Q101 qualified variants available | Validated for automotive underhood applications including engine control modules and battery management system inputs. |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 12 V/24 V/48 V automotive power distribution networks from load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC converter input to clamp spikes up to ±120 V. Use Value: Clamps transients to ≤243 V within nanoseconds, preventing damage to downstream PMICs and microcontrollers in ADAS ECUs. |
Use Scenario: Shielding analog output lines of pressure/temperature sensors in factory automation PLCs from EFT and surge coupling. IC Role / Device Role / Timing Role: Parallel-connected TVS on 4–20 mA or 0–10 V output paths to absorb induced transients without affecting signal fidelity. Use Value: Leakage <1.0 μA at 150 V ensures no loading error on high-impedance sensor outputs; fast response preserves signal integrity. |
| Telecom DC Feeder Protection | Renewable Energy Inverter DC Link Protection |
|
Use Scenario: Safeguarding PoE-powered equipment and remote radio units against lightning-induced surges on 48 V DC feeder lines. IC Role / Device Role / Timing Role: Primary clamping device on DC input stage upstream of isolation and regulation circuitry. Use Value: 400 W rating handles multiple 10/1000 μs events per IEC 61643-21; VC ≤243 V keeps protected ASICs within absolute maximum ratings. |
Use Scenario: Protecting high-voltage DC link monitoring circuits in solar string inverters exposed to grid switching transients. IC Role / Device Role / Timing Role: Standoff-rated TVS on voltage divider networks feeding ADCs or isolation amplifiers measuring 150–600 V DC bus. Use Value: Precise 150 V VWM allows direct placement on 150 V measurement nodes without resistive attenuation; low capacitance avoids signal distortion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ150A-E3/5A | Same electrical specs; RoHS-compliant but contains brominated flame retardants (non-halogen-free). | Approved for commercial-grade industrial use; not certified for halogen-free requirements in automotive interiors. | Select when halogen-free compliance is not mandated and cost sensitivity favors E3 over M3. |
| SMAJ150AHE3_A/I | Identical electrical specs plus AEC-Q101 qualification; same M3 halogen-free base material with automotive traceability. | Qualified for under-hood automotive applications (e.g., battery disconnect units); includes extended reliability testing. | Select when automotive qualification and full traceability are required, even if commercial-grade M3 suffices for function. |
Compared with SMAJ150A-M3/5A, the E3 variant trades halogen-free status for broader commercial availability, while the HE3_A/I adds AEC-Q101 validation-enabling use in safety-critical automotive subsystems without redesigning layout or recalculating clamping margins.
Availability
SMAJ150A-M3/5A is available at Aetrix Electronics and suitable for automotive power input protection, industrial sensor interface hardening, and telecom DC feeder surge suppression requiring stable component supply across multi-year production cycles.
Supply support for SMAJ150A-M3/5A 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 SMAJ series is engineered for high-energy transient suppression in harsh environments-targeting automotive, industrial, and telecom systems where consistent clamping performance and long-term stability under thermal cycling are mandatory.
FAQ
What is the clamping voltage of the SMAJ150A-M3/5A at its rated peak pulse current?
The SMAJ150A-M3/5A has a maximum clamping voltage (VC) of 243 V when subjected to its rated peak pulse current of 1.2 A under the standardized 10/1000 μs waveform. This value is measured per JEDEC test conditions and guarantees the protected circuit will not experience voltages exceeding 243 V during such transient events. The SMAJ150A-M3/5A maintains this clamping performance across its specified operating temperature range.
Is the SMAJ150A-M3/5A suitable for automotive applications?
The SMAJ150A-M3/5A itself is a commercial-grade, halogen-free, RoHS-compliant part-not AEC-Q101 qualified. However, Vishay offers the pin-identical SMAJ150AHE3_A/I variant, which shares all electrical and mechanical characteristics of the SMAJ150A-M3/5A but adds full AEC-Q101 qualification. For automotive under-hood use, specify the HE3 or HM3 automotive-grade version; the SMAJ150A-M3/5A remains appropriate for non-automotive industrial or telecom designs.
What does the "M3" suffix indicate in SMAJ150A-M3/5A?
The "M3" suffix in SMAJ150A-M3/5A denotes halogen-free, RoHS-compliant construction meeting IEC 61249-2-21 requirements. It confirms the molding compound contains no brominated or chlorinated flame retardants, and the matte tin-plated leads comply with JESD 201 Class 2 whisker resistance. This distinguishes it from the "E3" suffix (RoHS-compliant but not halogen-free) and supports compliance in environmentally regulated markets like EU automotive interiors.
How does the SMAJ150A-M3/5A compare to bidirectional TVS diodes like SMAJ150CA?
The SMAJ150A-M3/5A is unidirectional and intended for DC line protection with defined polarity (cathode marked), whereas SMAJ150CA is bidirectional and used in AC or floating signal paths. Their VWM, VBR, and VC values differ: SMAJ150A-M3/5A has VWM = 150 V and clamps only in reverse; SMAJ150CA has symmetric 150 V standoff and clamps in both directions. Using SMAJ150A-M3/5A on an AC line would cause forward conduction and failure. The SMAJ150A-M3/5A must be oriented correctly in-circuit.
What PCB layout considerations apply to the SMAJ150A-M3/5A for optimal surge performance?
For optimal transient energy dissipation, the SMAJ150A-M3/5A should be mounted on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in the Vishay datasheet. Short, wide traces to ground and protected line minimize inductance; avoid vias in the main current path. Thermal relief is discouraged-the full pad area enhances heat spreading. The SMAJ150A-M3/5A's RθJA = 120 °C/W assumes this layout; reducing pad size degrades both surge handling and steady-state power capability.
SMAJ150A-M3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 150V
- Voltage - Breakdown (Min):
- 167V
- Voltage - Clamping (Max) @ Ipp:
- 243V
- Current - Peak Pulse (10/1000µs):
- 1.2A
- Power - Peak Pulse:
- 300W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ150A-M3/5A FAQ
1.How can I place an order for SMAJ150A-M3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ150A-M3/5A 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 SMAJ150A-M3/5A reliable?
The price and inventory of SMAJ150A-M3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ150A-M3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ150A-M3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ150A-M3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ150A-M3/5A?
SMAJ150A-M3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ150A-M3/5A 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 SMAJ150A-M3/5A?
For technical support, including SMAJ150A-M3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ150A-M3/5A requirements.
6.How does Aetrix verify that SMAJ150A-M3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ150A-M3/5A 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 SMAJ150A-M3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ150A-M3/5A?
All SMAJ150A-M3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ150A-M3/5A, 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 SMAJ150A-M3/5A part is unused and in its original packaging.
Return procedure for SMAJ150A-M3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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