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Vishay General Semiconductor - Diodes Division SMAJ30AHM3/I
- Part No.:
- SMAJ30AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ30AHM3/I.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,855
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Product details
Overview
SMAJ30AHM3/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 30 V standoff voltage (VWM), 33.3–36.8 V breakdown voltage (VBR) at 1 mA, 400 W peak pulse power (10/1000 μs), and clamps to ≤48.4 V at 8.3 A peak surge current - deployed in automotive ECUs, industrial sensor interfaces, and DC power rails.
For engineers reviewing the SMAJ30AHM3/I datasheet, SMAJ30AHM3/I pinout, SMAJ30AHM3/I application, or SMAJ30AHM3/I equivalent, this page delivers verified electrical specs, thermal derating behavior, AEC-Q101 qualification status, junction-to-lead thermal resistance (30 °C/W), and halogen-free RoHS-compliant construction per JESD201 Class 2 whisker testing.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-band polarity marking, optimized for fast transient suppression (<1 ns response) in low-inductance PCB layouts. Its glass-passivated junction ensures stable leakage (<1 μA at 30 V) and robust surge handling up to 40 A IFSM (8.3 ms half-sine).
Rated for -55 °C to +150 °C junction temperature, it uses SMA package thermal characteristics (RθJA = 120 °C/W, RθJL = 30 °C/W) and meets MSL Level 1 reflow (260 °C peak). The HM3 suffix confirms halogen-free, RoHS-compliant, AEC-Q101-qualified construction for automotive-grade reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V - maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 33.3 V / 36.8 V at 1 mA - guaranteed breakdown range defining turn-on threshold |
| VC @ IPPM | ≤48.4 V at 8.3 A - clamped voltage during 10/1000 μs surge, limiting downstream stress |
| PPPM | 400 W (10/1000 μs) - peak transient energy absorption capability |
| ID @ VWM | ≤1.0 μA - ultra-low leakage preserves signal integrity and battery life in standby |
| TJ max | +150 °C - enables operation in under-hood automotive and industrial ambient environments |
| RθJL | 30 °C/W - low junction-to-lead thermal resistance supports high-repetition surge duty cycles |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, single-axis molded case with matte tin-plated leads solderable per J-STD-002. Cathode identified by black band; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient clamp output node | Connected to protected line; conducts surge current to ground when V > VBR |
| Anode (unbanded end) | Reference/return path | Typically tied to system ground or low-impedance return plane for effective clamping |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including HTOL, TCT, ESD-HBM/MM, and surge endurance |
| Halogen-free & RoHS | HM3 suffix confirms compliance with JEDEC J-STD-020 MSL Level 1 and JESD201 Class 2 whisker resistance |
| 400 W peak pulse rating | Handles IEC 61000-4-5 Level 4 (4 kV) surges without degradation when mounted on 5 mm × 5 mm copper pads |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes overvoltage exposure to downstream ICs such as CAN transceivers or microcontroller I/O pins |
| Fast response time | Sub-nanosecond turn-on ensures protection against EFT (IEC 61000-4-4) and lightning-induced transients |
Applications
| Automotive Body Control Module (BCM) | Industrial RS-485 Sensor Node |
|---|---|
Use Scenario: Protecting LIN bus transceiver power input from load-dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamping 12 V supply rail to prevent overvoltage damage to transceiver ICs. Use Value: Withstands 40 A surge (IFSM) and maintains <1 μA leakage at 30 V, ensuring low quiescent current in always-on modules. |
Use Scenario: Shielding RS-485 data lines from ESD and induced surges in factory-floor PLC networks. IC Role / Device Role / Timing Role: Fast-clamping TVS placed across differential pair to limit common-mode transients before receiver input stage. Use Value: 48.4 V clamping voltage prevents latch-up in isolated RS-485 transceivers rated for ±25 V common-mode range. |
| DC Power Input Stage (12–24 V) | Automotive Camera Module Power Rail |
Use Scenario: Safeguarding buck converter input capacitors and MOSFETs from ISO 7637-2 pulse 1/2/5a transients. IC Role / Device Role / Timing Role: Primary front-end TVS absorbing >90% of surge energy before reaching downstream filtering. Use Value: 400 W rating and 30 °C/W RθJL enable repeated surge events without thermal runaway in compact enclosures. |
Use Scenario: Protecting image sensor and serializer IC power pins from cable discharge events in rear-view camera systems. IC Role / Device Role / Timing Role: Localized TVS placed within 2 mm of connector to minimize inductive overshoot during ESD contact discharge. Use Value: AEC-Q101 qualification and -55 °C to +150 °C operation ensure reliability across vehicle lifetime and environmental extremes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ30AHE3/I | Same electrical specs, but RoHS-compliant (E3) without halogen-free requirement; not AEC-Q101 qualified | Suitable for commercial/industrial use where automotive qualification is unnecessary | Select when AEC-Q101 is not required and halogen content is unrestricted |
| SMBJ30A-HM3 | Higher 600 W PPPM rating, SMB (DO-214AA) package - larger footprint and 20% higher RθJA (144 °C/W) | Better for higher-energy surges; requires more PCB area and less efficient thermal coupling | Choose when surge energy exceeds 400 W and layout allows larger package |
Compared with SMAJ30AHM3/I, SMAJ30AHE3/I lacks automotive qualification and halogen-free assurance, while SMBJ30A-HM3 trades compact size for higher surge capacity and reduced thermal performance - making SMAJ30AHM3/I optimal for space-constrained AEC-Q101 designs needing balanced power, size, and reliability.
Availability
SMAJ30AHM3/I is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, and DC power input protection requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SMAJ30AHM3/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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific validation.
The SMAJ series targets automotive and industrial transient suppression, engineered for AEC-Q101 compliance, low clamping voltage, and robust surge endurance in surface-mount form factors.
FAQ
What is the clamping voltage of SMAJ30AHM3/I at its rated peak pulse current?
The SMAJ30AHM3/I clamps to a maximum of 48.4 V at its specified peak pulse current of 8.3 A (10/1000 μs waveform). This value is measured under standard test conditions with 0.2" × 0.2" copper pads per terminal and defines the upper voltage limit imposed on protected circuitry during surge events. The clamping voltage remains stable across temperature due to the device's low VBR temperature coefficient (0.099 %/°C).
Is SMAJ30AHM3/I qualified for automotive applications?
Yes, SMAJ30AHM3/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation (Document Number: 88390, Revision: 09-Jan-2024). It undergoes stress testing including high-temperature operating life, temperature cycling, ESD-HBM/MM, and surge endurance - making it suitable for under-hood and cabin electronics where reliability under harsh conditions is mandatory.
What does the "HM3" suffix mean in SMAJ30AHM3/I?
The "HM3" suffix in SMAJ30AHM3/I indicates halogen-free, RoHS-compliant construction meeting JESD201 Class 2 whisker resistance, and AEC-Q101 qualification. It distinguishes this variant from E3 (RoHS only) and HE3 (RoHS + AEC-Q101, but not halogen-free). The "I" denotes 13-inch tape-and-reel packaging (7500 units per reel), supporting automated SMT assembly.
How does SMAJ30AHM3/I compare to bidirectional TVS diodes like SMAJ30CA?
SMAJ30AHM3/I is unidirectional and intended for DC power-line protection with defined polarity, whereas SMAJ30CA is bidirectional and used for AC or symmetrical signal-line protection. SMAJ30AHM3/I has lower leakage (<1 μA at 30 V) and avoids ambiguity in grounding configuration, but cannot suppress negative-going transients on AC-coupled lines - selection depends strictly on circuit topology and polarity requirements.
What is the thermal resistance from junction to lead (RθJL) for SMAJ30AHM3/I?
The SMAJ30AHM3/I has a typical junction-to-lead thermal resistance (RθJL) of 30 °C/W, as specified in Vishay's datasheet (Document Number: 88390). This low value enables efficient heat transfer from the silicon die to the PCB copper through the leads, supporting higher repetition-rate surge events without exceeding the +150 °C maximum junction temperature - critical for automotive and industrial applications with frequent transient exposure.
SMAJ30AHM3/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:
- Discontinued at Digi-Key
- 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/I FAQ
1.How can I place an order for SMAJ30AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ30AHM3/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/I reliable?
The price and inventory of SMAJ30AHM3/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/I is usually 5 days.
3.What payment methods are accepted for SMAJ30AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ30AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ30AHM3/I?
SMAJ30AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ30AHM3/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/I?
For technical support, including SMAJ30AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ30AHM3/I requirements.
6.How does Aetrix verify that SMAJ30AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMAJ30AHM3/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/I meets industry standards.
7.What is the process for return or replacement of SMAJ30AHM3/I?
All SMAJ30AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ30AHM3/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/I part is unused and in its original packaging.
Return procedure for SMAJ30AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ30AHM3/I Tags
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