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Vishay General Semiconductor - Diodes Division SMAJ150AHM3_A/H
- Part No.:
- SMAJ150AHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ150AHM3_A/H.pdf
- Description:
- TVS DIODE 150VWM 243VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,480
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Product details
Overview
SMAJ150AHM3_A/H 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 150 V stand-off voltage (VWM), 167–185 V breakdown voltage (VBR) at 1 mA, 243 V maximum clamping voltage (VC) at 1.2 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial power rails.
For engineers reviewing the SMAJ150AHM3_A/H datasheet, SMAJ150AHM3_A/H pinout, SMAJ150AHM3_A/H application, or SMAJ150AHM3_A/H equivalent, key selection criteria include clamping voltage margin relative to protected device's absolute maximum rating, thermal resistance (RθJA = 120 °C/W), AEC-Q101 qualification status, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, triggered when reverse voltage exceeds its specified breakdown range. Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and fast response time (<1.0 ps), enabling suppression of ESD, lightning-induced surges, and inductive switching spikes before downstream components are damaged.
The device is rated for 40 A peak forward surge current (IFSM, 8.3 ms half-sine), supports operating junction temperatures from –55 °C to +150 °C, and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak - confirming suitability for high-reliability automotive PCB assembly where thermal cycling and long-term stability are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 150 V - maximum continuous reverse working voltage before clamping begins; sets upper limit for normal circuit operation. |
| VBR min/max | 167 V / 185 V at 1 mA - guaranteed avalanche initiation window; defines minimum overvoltage threshold for protection activation. |
| VC @ IPPM | 243 V at 1.2 A - clamped voltage during 10/1000 μs transient; must remain below protected device's absolute max rating. |
| PPPM | 400 W - peak pulse power handling with 10/1000 μs waveform; derates to 300 W above 78 V per spec note. |
| ID @ VWM | ≤1.0 μA - ultra-low reverse leakage at stand-off voltage; minimizes standby power loss and avoids false triggering. |
| RθJA | 120 °C/W - thermal resistance junction-to-ambient on standard 0.2" × 0.2" copper pads; determines required board copper area for thermal management. |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness per AEC stress test plan. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile plastic case with matte tin-plated leads solderable per J-STD-002. Cathode indicated by band on body; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when voltage exceeds VBR. |
| Anode (unbanded end) | Reference node | Typically tied to system ground or lower-potential rail; completes clamping path during overvoltage event. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power | Enables robust protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 12 V/24 V automotive power nets. |
| AEC-Q101 qualified | Validated for under-hood and ADAS applications requiring extended temperature operation and long-term reliability. |
| MSL Level 1 | Allows single-reflow assembly without moisture sensitivity concerns; eliminates bake requirements prior to SMT. |
| Glass passivated junction | Ensures stable VBR and low leakage over lifetime, even under humidity and thermal stress conditions. |
| Halogen-free & RoHS-compliant | Meets automotive environmental compliance mandates (e.g., ELV, IMDS) and supports green manufacturing. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: 12 V battery line in engine control unit exposed to load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery input and DC-DC converter input stage. Use Value: Limits transient voltage to ≤243 V, preventing damage to 36 V-rated input capacitors and controller ICs. | Use Scenario: Analog output line of pressure sensor in factory automation PLC module subject to ESD and cable discharge events. IC Role / Device Role / Timing Role: Point-of-entry TVS on 4–20 mA loop output, referenced to local ground. Use Value: Clamps ±15 kV contact ESD (IEC 61000-4-2) within <1 ns, preserving signal integrity and ADC accuracy. |
| Telecom DC Power Feeding | Consumer Device USB Port Protection |
Use Scenario: -48 V DC feeding line in remote radio head powered via PoE-like infrastructure with lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectional-capable variant not applicable; this unidirectional part used with polarity-aware feed design. Use Value: Withstands 10/1000 μs 1 kA surge while maintaining <1 μA leakage, ensuring no impact on biasing of downstream LDOs. | Use Scenario: VBUS line in portable speaker docking station subjected to hot-plug transients and accidental 12 V misconnection. IC Role / Device Role / Timing Role: Primary overvoltage clamp ahead of USB power switch and charging IC. Use Value: Activates at 167 V, clamping to 243 V - safely isolating 5 V USB subsystem from external fault voltages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ150AHE3_A/H | Same electrical specs, RoHS-compliant but not halogen-free; uses standard tin plating instead of halogen-free molding compound. | Acceptable for commercial/industrial use where halogen-free requirement is not mandated. | Select when cost sensitivity outweighs halogen-free compliance; identical footprint and thermal performance. |
| SMAJ150A-M3/61 | Same electrical specs and halogen-free construction, but packaged in 7" tape-and-reel with different reel code (61 vs H); no functional difference. | Identical use cases; differs only in packaging logistics and traceability marking. | Select when supply chain requires standard Digi-Key/Mouser-compatible reel coding (61) rather than Vishay-specific H-code. |
Compared with SMAJ150AHM3_A/H, SMAJ150AHE3_A/H trades halogen-free compliance for lower cost in non-automotive designs, while SMAJ150A-M3/61 offers identical performance with standardized reel packaging - making the HM3 variant optimal for AEC-Q101-critical automotive programs requiring full material compliance documentation.
Availability
SMAJ150AHM3_A/H is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and telecom DC feeding applications requiring stable component supply, AEC-Q101 validation, and halogen-free compliance.
Supply support for SMAJ150AHM3_A/H 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 failure due to voltage surges must be eliminated through proven clamping performance and qualification rigor.
FAQ
What is the clamping voltage of SMAJ150AHM3_A/H at its rated peak pulse current?
The SMAJ150AHM3_A/H has a maximum clamping voltage (VC) of 243 V at 1.2 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured per JEDEC test conditions and represents the upper voltage limit imposed on the protected circuit during a defined surge event - critical for ensuring compatibility with downstream components rated for ≤250 V absolute maximum.
Is SMAJ150AHM3_A/H qualified for automotive applications?
Yes, SMAJ150AHM3_A/H is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation in the 88390 datasheet. This qualification covers stress tests including temperature cycling, high-temperature reverse bias, and ESD, validating its use in automotive power modules, body control units, and ADAS sensors where reliability under thermal and electrical stress is mandatory.
How does the halogen-free construction of SMAJ150AHM3_A/H affect its thermal performance?
The halogen-free molding compound in SMAJ150AHM3_A/H does not alter thermal resistance values - RθJA remains 120 °C/W and RθJL is 30 °C/W, identical to non-halogen variants. Vishay maintains thermal performance consistency across E3/M3/HE3/HM3 suffixes; the halogen-free designation relates solely to material composition compliance, not thermal or electrical derating.
Can SMAJ150AHM3_A/H be used in bidirectional transient protection circuits?
No, SMAJ150AHM3_A/H is a unidirectional TVS diode, indicated by the "A" (not "CA") suffix and cathode band marking. For bidirectional protection, Vishay specifies parts with "CA" suffix (e.g., SMAJ150CA). Using SMAJ150AHM3_A/H in reverse-biased configurations risks permanent damage due to lack of symmetrical avalanche capability.
What is the maximum printed circuit board copper pad size recommended for SMAJ150AHM3_A/H to achieve its rated 400 W pulse power?
Vishay specifies that the 400 W peak pulse power rating for SMAJ150AHM3_A/H is achieved when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal - as stated in the "Maximum Ratings" table footnote (2). Reducing pad area lowers thermal dissipation, causing derating per Figure 2; maintaining this pad size ensures full power handling without exceeding TJ max of 150 °C.
SMAJ150AHM3_A/H 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:
- 400W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ150AHM3_A/H FAQ
1.How can I place an order for SMAJ150AHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ150AHM3_A/H 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 SMAJ150AHM3_A/H reliable?
The price and inventory of SMAJ150AHM3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ150AHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ150AHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ150AHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ150AHM3_A/H?
SMAJ150AHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ150AHM3_A/H 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 SMAJ150AHM3_A/H?
For technical support, including SMAJ150AHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ150AHM3_A/H requirements.
6.How does Aetrix verify that SMAJ150AHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ150AHM3_A/H 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 SMAJ150AHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ150AHM3_A/H?
All SMAJ150AHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ150AHM3_A/H, 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 SMAJ150AHM3_A/H part is unused and in its original packaging.
Return procedure for SMAJ150AHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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