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Vishay General Semiconductor - Diodes Division SMAJ30AHM3_A/H
- Part No.:
- SMAJ30AHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ30AHM3_A/H.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,090
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Product details
Overview
SMAJ30AHM3_A/H from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of sensitive electronics. 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, and 400 W peak pulse power rating with 10/1000 μs waveform - deployed on power rails and signal lines in automotive ECUs and industrial sensor interfaces.
For engineers reviewing the SMAJ30AHM3_A/H datasheet, SMAJ30AHM3_A/H pinout, SMAJ30AHM3_A/H application, or SMAJ30AHM3_A/H equivalent, key selection criteria include clamping performance under 8.3 A surge, thermal resistance (RθJA = 120 °C/W), AEC-Q101 qualification status, halogen-free RoHS compliance, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a unidirectional clamping device, leveraging a glass-passivated silicon junction to achieve sub-nanosecond response to transients. Its design targets fast-rising ESD and inductive switching surges, with low incremental surge resistance ensuring minimal voltage overshoot during clamping.
The SMAJ30AHM3_A/H is rated for repetitive 0.01% duty cycle pulses and derates linearly above 25 °C ambient per Fig. 2 in the datasheet. It meets MSL Level 1 per J-STD-020, supports peak forward surge current of 40 A (8.3 ms half-sine), and is qualified to AEC-Q101 for automotive use - confirmed by HM3 suffix and ordering code structure.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC working range. |
| VBR (min/max) | 33.3 V / 36.8 V at IT = 1 mA - Confirmed breakdown threshold ensures predictable turn-on margin above VWM. |
| VC @ IPPM | 48.4 V at 8.3 A - Clamped voltage during 10/1000 μs surge; determines protected circuit's maximum stress level. |
| PPPM | 400 W - Peak pulse power handling capability with standard 10/1000 μs waveform; validates surge energy absorption. |
| IFSM | 40 A - Single half-sine surge current rating (8.3 ms); supports high-energy inductive load switching events. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments. |
| RθJA | 120 °C/W - Thermal resistance junction-to-ambient on standard pad layout; informs PCB thermal design requirements. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. Cathode indicated by band; polarity-critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional configuration. |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 30 V rail or signal trace); conducts only during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensor interfaces. |
| Halogen-free & RoHS-compliant | HM3 suffix confirms full compliance with environmental standards without compromising surge robustness. |
| 400 W peak pulse power | Withstands IEC 61000-4-5 Level 4 surge (4 kV/2 Ω) on 30 V supply lines when properly laid out. |
| Fast response time | Sub-nanosecond junction response ensures clamping before downstream ICs experience damage thresholds. |
| MSL Level 1 moisture sensitivity | Enables standard reflow without baking; compatible with high-volume automated SMT assembly. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V power inputs in engine control modules against load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between power rail and ground, absorbing >400 W surges within nanoseconds. Use Value: Prevents latch-up or gate oxide rupture in MCU power domains by limiting rail voltage to ≤48.4 V during 8.3 A surge events. | Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loop) of pressure sensors from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance (<50 pF) TVS connected across signal and return, activated only during transients >30 V. Use Value: Maintains signal integrity below 30 V while clamping ESD spikes to <48.4 V, preserving ADC accuracy and avoiding false triggers. |
| Consumer Device USB Port Protection | Telecom Equipment DC Input Protection |
Use Scenario: Safeguarding USB VBUS lines in portable chargers and docking stations from hot-plug and lightning-induced surges. IC Role / Device Role / Timing Role: Unidirectional TVS mounted directly at connector, with cathode tied to VBUS and anode to ground. Use Value: Limits VBUS overshoot to 48.4 V during 10/1000 μs surges, preventing damage to USB controller ICs rated for 5.5 V absolute max. | Use Scenario: Protecting -48 V DC input stages in telecom base station power supplies from induced lightning surges. IC Role / Device Role / Timing Role: Reverse-connected unidirectional TVS (cathode to ground, anode to -48 V rail) for negative-rail clamping. Use Value: Clamps negative surges to ≤48.4 V magnitude relative to ground, enabling compatibility with -48 V telecom infrastructure standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ30AHE3_A/H | RoHS-compliant but not halogen-free; lacks HM3 environmental certification. | Acceptable for commercial/industrial use where halogen-free requirement is absent. | Select when cost sensitivity outweighs halogen-free mandate and AEC-Q101 is not required. |
| SMAJ30A-M3/61 | Same electrical specs; differs only in packaging format (61 = 7" reel, 1800 pcs) and base P/N suffix. | No functional difference; identical performance and qualification (HM3 vs M3 denotes same halogen-free spec). | Choose based on logistics preference - SMAJ30AHM3_A/H uses H-code reel; M3/61 uses legacy ordering syntax. |
Compared with SMAJ30AHE3_A/H, the SMAJ30AHM3_A/H adds halogen-free compliance without sacrificing clamping performance or thermal rating; versus SMAJ30A-M3/61, it shares identical specifications but reflects updated Vishay suffix conventions for AEC-Q101 and halogen-free status.
Availability
SMAJ30AHM3_A/H is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor systems, and telecom power supply designs requiring stable component supply, AEC-Q101 validation, and halogen-free compliance.
Supply support for SMAJ30AHM3_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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMAJ series is engineered for high-reliability transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where robustness against ESD, lightning, and load dump is mission-critical.
FAQ
What is the clamping voltage of the SMAJ30AHM3_A/H under a 10/1000 μs surge?
The SMAJ30AHM3_A/H has a maximum clamping voltage (VC) of 48.4 V at 8.3 A peak pulse current (IPPM) with a 10/1000 μs waveform. This value is measured per standard test conditions in the Vishay datasheet and defines the upper voltage limit imposed on protected circuits during surge events. The SMAJ30AHM3_A/H maintains this clamping performance across its qualified temperature range.
Is the SMAJ30AHM3_A/H qualified for automotive applications?
Yes, the SMAJ30AHM3_A/H is AEC-Q101 qualified, as confirmed by the HM3 suffix and Vishay's ordering documentation. This qualification validates its reliability for automotive use cases including engine control units, body electronics, and ADAS sensor interfaces. The SMAJ30AHM3_A/H undergoes stress testing for temperature cycling, humidity, and mechanical shock per AEC-Q101 requirements.
What does the 'HM3' suffix indicate in SMAJ30AHM3_A/H?
The 'HM3' suffix in SMAJ30AHM3_A/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It distinguishes this variant from E3 (RoHS only) and HE3 (RoHS + AEC-Q101, non-halogen-free) versions. The SMAJ30AHM3_A/H meets JESD201 Class 2 whisker resistance and UL 94 V-0 flammability standards, making it suitable for environmentally regulated automotive and industrial deployments.
Can SMAJ30AHM3_A/H be used in bidirectional configurations?
No, SMAJ30AHM3_A/H is a unidirectional TVS diode, as indicated by the 'A' (not 'CA') suffix and presence of cathode band marking. Bidirectional operation requires the 'CA' variant (e.g., SMAJ30CA). Using SMAJ30AHM3_A/H in reverse-biased signal paths without proper polarity alignment will result in unintended conduction or failure to clamp in one direction. Always verify polarity during PCB layout for SMAJ30AHM3_A/H.
What is the thermal resistance of SMAJ30AHM3_A/H, and how does it affect PCB layout?
The SMAJ30AHM3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes minimum recommended pad layout per Vishay's package drawing. To maintain TJ ≤ 150 °C under sustained 3.3 W dissipation, designers must ensure adequate copper area and avoid excessive trace length - undersized pads will cause thermal derating and premature failure. The SMAJ30AHM3_A/H thermal performance is validated only with this layout.
SMAJ30AHM3_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):
- 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/H FAQ
1.How can I place an order for SMAJ30AHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ30AHM3_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 SMAJ30AHM3_A/H reliable?
The price and inventory of SMAJ30AHM3_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 SMAJ30AHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ30AHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ30AHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ30AHM3_A/H?
SMAJ30AHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ30AHM3_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 SMAJ30AHM3_A/H?
For technical support, including SMAJ30AHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ30AHM3_A/H requirements.
6.How does Aetrix verify that SMAJ30AHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ30AHM3_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 SMAJ30AHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ30AHM3_A/H?
All SMAJ30AHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ30AHM3_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 SMAJ30AHM3_A/H part is unused and in its original packaging.
Return procedure for SMAJ30AHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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