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Vishay General Semiconductor - Diodes Division SMAJ30AHM3_A/I
- Part No.:
- SMAJ30AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ30AHM3_A/I.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,687
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Product details
Overview
SMAJ30AHM3_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 30 V stand-off voltage (VWM), 33.3–36.8 V breakdown voltage (VBR) at 1 mA, 48.4 V maximum clamping voltage (VC) at 8.3 A peak pulse current (IPPM), and 400 W peak pulse power (10/1000 μs waveform), targeting protection of MOSFETs, ICs, and sensor interfaces in automotive and industrial systems.
For engineers reviewing the SMAJ30AHM3_A/I datasheet, SMAJ30AHM3_A/I pinout, SMAJ30AHM3_A/I application, or SMAJ30AHM3_A/I equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification status, 150 °C max junction temperature, low incremental surge resistance, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a clamping device that remains high-impedance below VWM (30 V) and rapidly transitions to low-impedance conduction above VBR (min 33.3 V) to limit transient overvoltages. Its glass-passivated junction ensures stable leakage performance (<1.0 μA at VWM) and fast response time (<1.0 ps), critical for protecting sensitive CMOS inputs and gate drivers.
The device is rated for 40 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine), supports continuous power dissipation of 3.3 W at 50 °C ambient, and exhibits a thermal resistance of 120 °C/W (junction-to-ambient) when mounted per recommended pad layout - enabling reliable operation in thermally constrained PCB environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V - Maximum reverse working voltage before significant leakage; defines safe operating range for continuous DC bias. |
| VBR (min/max) | 33.3 V / 36.8 V at 1 mA - Voltage range where device enters avalanche breakdown; determines minimum overvoltage threshold for clamping activation. |
| VC @ IPPM | 48.4 V at 8.3 A - Clamped voltage during 10/1000 μs transient; directly limits stress on downstream components like microcontrollers or transceivers. |
| PPPM | 400 W (≤78 V) - Peak pulse power handling capability; specifies energy absorption capacity for common lightning/inductive-switching surges. |
| ID @ VWM | ≤1.0 μA - Reverse leakage current at rated stand-off voltage; ensures minimal standby power loss and signal integrity in high-impedance circuits. |
| TJ max. | +150 °C - Maximum junction temperature; enables use in under-hood automotive or industrial control enclosures without derating. |
| Package | SMA (DO-214AC) - Surface-mount package with 2.54 mm lead pitch; compatible with standard reflow profiles and J-STD-020 MSL level 1 handling. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; cathode indicated by band on one end; polarity-critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or low-voltage reference; completes clamping path during transient events. |
| Cathode | High-side connection point | Connected to protected line (e.g., 30 V rail or signal trace); carries full surge current into anode during clamping. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity testing, and mechanical shock - suitable for engine control units and ADAS sensors. |
| 400 W peak pulse power (10/1000 μs) | Handles IEC 61000-4-5 Level 3 (1 kV/2 Ω) surge events without degradation when mounted on 5.0 mm × 5.0 mm copper pads. |
| Glass passivated junction | Ensures stable VBR tolerance and low leakage across -55 °C to +150 °C; eliminates risk of parameter drift in harsh thermal environments. |
| MSL level 1 (260 °C peak) | Compatible with standard lead-free reflow soldering processes without moisture sensitivity concerns or baking requirements. |
| Halogen-free & RoHS-compliant | Meets environmental compliance standards for global electronics manufacturing; HM3 suffix confirms halogen-free molding compound. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V/24 V battery-fed ECUs from load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between power input and ground to shunt surge energy away from LDOs and MCU power pins. Use Value: Limits transient voltage to ≤48.4 V, preventing latch-up or permanent damage to 3.3 V/5 V logic supplies downstream. |
Use Scenario: Safeguarding analog outputs of pressure/temperature sensors connected to PLC analog input modules. IC Role / Device Role / Timing Role: Standoff protection element on 4–20 mA current loop or 0–10 V output line, absorbing ESD and field-induced spikes. Use Value: Maintains signal fidelity with <1.0 μA leakage at 30 V, avoiding offset errors in precision measurement circuits. |
| DC-DC Converter Input Stage | MOSFET Gate Driver Protection |
|
Use Scenario: Input-side surge suppression for buck converters powering infotainment head units or ADAS camera modules. IC Role / Device Role / Timing Role: Primary transient clamp upstream of input capacitor and controller IC, activated within picoseconds of overvoltage onset. Use Value: Withstands 40 A single-half-sine surge (IFSM), ensuring robustness against repeated ignition noise events without parametric shift. |
Use Scenario: Protecting high-side N-channel MOSFET gate drivers from Miller-induced voltage spikes during switching transitions. IC Role / Device Role / Timing Role: Fast-response clamping diode between gate and source, limiting dv/dt-induced overshoot to safe levels for driver ICs. Use Value: Low clamping voltage (48.4 V) prevents gate oxide breakdown while maintaining <0.099 %/°C VBR temperature coefficient for stable threshold behavior. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ30AHE3_A/I | Same electrical specs but RoHS-compliant (non-halogen-free) construction; lacks halogen-free certification. | Acceptable for commercial/industrial use where halogen-free mandate does not apply; not certified for automotive Tier 1 supply chains requiring HM3. | Select SMAJ30AHM3_A/I when halogen-free compliance is required per customer specification or regional environmental regulation. |
| SMAJ30A-M3/5A | Identical electrical parameters and HM3 halogen-free qualification; differs only in packaging format (13" reel, 7500 pcs). | No functional difference; used interchangeably in production where tape-and-reel logistics align with SMT line feeder configuration. | Choose SMAJ30AHM3_A/I for 7" reel (1800 pcs) delivery; select SMAJ30A-M3/5A for high-volume automated assembly requiring larger reels. |
Compared with SMAJ30AHE3_A/I, SMAJ30AHM3_A/I adds halogen-free assurance for automotive OEM compliance; versus SMAJ30A-M3/5A, it offers identical performance in a smaller reel format optimized for pilot runs and design validation builds.
Availability
SMAJ30AHM3_A/I is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface protection, DC-DC converter input stage hardening, and MOSFET gate driver safeguarding requiring stable component supply and long-term lifecycle support.
Supply support for SMAJ30AHM3_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 reliability, efficiency, and application-specific optimization.
The SMAJ series was developed specifically for high-energy transient suppression in automotive, industrial, and telecom infrastructure - delivering consistent clamping performance across wide temperature ranges and stringent AEC-Q101 reliability requirements.
FAQ
What is the maximum clamping voltage of the SMAJ30AHM3_A/I under a 10/1000 μs surge?
The SMAJ30AHM3_A/I has a maximum clamping voltage (VC) of 48.4 V at 8.3 A peak pulse current (IPPM) under the standardized 10/1000 μs waveform. This value is measured per JEDEC test conditions and defines the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is the SMAJ30AHM3_A/I qualified for automotive applications?
Yes, the SMAJ30AHM3_A/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation in datasheet revision 09-Jan-2024. This qualification covers stress tests including temperature cycling, high-temperature operating life, and mechanical shock - making SMAJ30AHM3_A/I suitable for under-hood and chassis-mounted automotive electronics.
What does the "HM3" suffix indicate in SMAJ30AHM3_A/I?
The "HM3" suffix in SMAJ30AHM3_A/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It distinguishes this variant from "HE3" (RoHS-compliant, AEC-Q101, but not halogen-free) and "E3/M3" (commercial-grade only). The "_A/I" indicates packaging in 13" tape-and-reel format with 7500 units per reel.
How does the SMAJ30AHM3_A/I compare to bidirectional TVS diodes like SMAJ30CA?
The SMAJ30AHM3_A/I is unidirectional and intended for DC-biased lines where polarity is fixed (e.g., +30 V supply rails), offering lower leakage and tighter VBR tolerance than bidirectional counterparts. In contrast, SMAJ30CA provides symmetrical clamping for AC or floating signals but exhibits higher ID at VWM and reduced precision in breakdown symmetry - making SMAJ30AHM3_A/I preferable for regulated power path protection.
What is the thermal resistance of the SMAJ30AHM3_A/I, and how does it affect PCB layout?
The SMAJ30AHM3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on the minimum recommended pad layout (0.2" × 0.2" copper pads per terminal). To maintain TJ ≤ 150 °C under 3.3 W continuous dissipation, designers must ensure adequate copper area and avoid excessive trace length - underscoring the need to follow Vishay's mounting guidelines for thermal reliability.
SMAJ30AHM3_A/I 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):
- 30V
- Voltage - Breakdown (Min):
- 33.3V
- Voltage - Clamping (Max) @ Ipp:
- 48.4V
- Current - Peak Pulse (10/1000µs):
- 8.3A
- 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)
SMAJ30AHM3_A/I FAQ
1.How can I place an order for SMAJ30AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ30AHM3_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 SMAJ30AHM3_A/I reliable?
The price and inventory of SMAJ30AHM3_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 SMAJ30AHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ30AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ30AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ30AHM3_A/I?
SMAJ30AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ30AHM3_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 SMAJ30AHM3_A/I?
For technical support, including SMAJ30AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ30AHM3_A/I requirements.
6.How does Aetrix verify that SMAJ30AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ30AHM3_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 SMAJ30AHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ30AHM3_A/I?
All SMAJ30AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ30AHM3_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 SMAJ30AHM3_A/I part is unused and in its original packaging.
Return procedure for SMAJ30AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ30AHM3_A/I Tags
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