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Vishay General Semiconductor - Diodes Division SMAJ30C-4HM3/I
- Part No.:
- SMAJ30C-4HM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ30C-4HM3/I.pdf
- Description:
- TVS DIODE 30VWM 53.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,940
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Product details
Overview
SMAJ30C-4HM3/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping ESD and surge transients on signal/power lines. It features 30 V stand-off voltage (VWM), 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), commonly deployed to protect MOSFET gates, sensor interfaces, and automotive control modules.
For engineers reviewing the SMAJ30C-4HM3/I datasheet, SMAJ30C-4HM3/I pinout, SMAJ30C-4HM3/I application, or SMAJ30C-4HM3/I equivalent, key selection criteria include bidirectional polarity, AEC-Q101 qualification status, clamping performance under 10/1000 μs surge, thermal resistance (RθJA = 120 °C/W), and halogen-free RoHS compliance per HM3 suffix.
Technical Context
This device operates as a voltage-clamping protector with symmetrical breakdown behavior in both directions due to its bidirectional construction. Its glass-passivated junction enables fast response (<1 ns) and low incremental surge resistance, critical for suppressing fast-rising transients from inductive switching or ESD events.
The SMAJ30C-4HM3/I is rated for -55 °C to +150 °C operating junction temperature, meets MSL level 1 per J-STD-020, and supports reflow soldering up to 260 °C peak. Its 30 V stand-off voltage ensures compatibility with 24 V automotive and industrial supply rails while maintaining low leakage (<1.0 μA at VWM).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V - Maximum continuous reverse working voltage before clamping begins; sets operating margin above 24 V system rails |
| VBR (min/max) | 33.3 V / 36.8 V - Breakdown voltage range at 1 mA test current; defines onset of avalanche conduction |
| VC @ IPPM | 48.4 V - Clamped voltage at 8.3 A peak pulse current (10/1000 μs); determines protected circuit's maximum transient exposure |
| PPPM | 400 W - Peak pulse power handling capability; sustains single high-energy surges without failure |
| ID @ VWM | <1.0 μA - Reverse leakage at 30 V; ensures minimal standby power loss and signal integrity |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance; requires minimum 5.0 mm × 5.0 mm copper pads for full power rating |
| Package | SMA (DO-214AC) - Surface-mount outline with 2.54 mm lead pitch; compatible with automated pick-and-place |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, UL 94 V-0 rated. Bidirectional configuration has no polarity marking; terminals are non-polarized anode/cathode pair.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (either direction) | Accepts surge current during positive or negative voltage excursions; symmetric with cathode |
| Cathode | Transient current exit (either direction) | Completes low-impedance path to ground or rail during clamping; identical function to anode in bidirectional mode |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock testing |
| Halogen-free & RoHS-compliant (HM3) | Meets environmental compliance requirements for automotive and industrial end equipment without compromising thermal or electrical performance |
| 400 W peak pulse power (10/1000 μs) | Withstands IEC 61000-4-5 Level 4 surge (4 kV line-earth, 2 kV line-line) when properly mounted |
| Fast response time (<1 ns) | Clamps transients before sensitive downstream ICs experience overvoltage stress |
| Low clamping ratio (VC/VWM = 1.61) | Minimizes voltage overshoot during surge events, enhancing protection margin for 3.3 V/5 V logic interfaces |
Applications
| Automotive Body Control Module | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protects LIN bus transceivers and relay driver outputs from load dump and inductive kickback in 12 V/24 V vehicle subsystems. IC Role / Device Role / Timing Role: Voltage-clamping TVS placed across power input or signal line to shunt surge energy to ground. Use Value: Enables robust operation under ISO 7637-2 Pulse 1 (−150 V/0.5 Ω) and Pulse 2a (+100 V/2 Ω) waveforms without latch-up or degradation. |
Use Scenario: Shields analog output lines (e.g., 4–20 mA current loop) of pressure/temperature sensors from ESD and field wiring transients. IC Role / Device Role / Timing Role: Bidirectional clamping element between signal and return path, referenced to local ground plane. Use Value: Maintains signal fidelity with sub-μA leakage at 30 V, while limiting transient excursion to ≤48.4 V during 8.3 A surges. |
| Consumer Appliance Motor Drive | Telecom Power Input Stage |
Use Scenario: Installed across DC link capacitors in BLDC motor inverters to absorb commutation spikes from MOSFET switching. IC Role / Device Role / Timing Role: Transient energy absorber parallel to bulk capacitance, activated only during overvoltage events. Use Value: Prevents gate oxide damage to 600 V MOSFETs by clamping spikes to 48.4 V, well below their 20 V VGS,max rating. |
Use Scenario: Applied at AC-DC adapter input to meet IEC 61000-4-5 surge immunity requirements for Class I telecom equipment. IC Role / Device Role / Timing Role: Primary-level surge suppression device upstream of rectifier and filter stage. Use Value: Handles 400 W surges without derating up to +85 °C ambient, supporting continuous operation in enclosed base station enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ30CA-E3/61 | Unqualified commercial grade; same VWM/VC/PPPM but lacks AEC-Q101 validation and halogen-free certification | Suitable for non-automotive industrial or consumer use where qualification is not mandated | Select when cost sensitivity outweighs automotive reliability requirements |
| SMBJ30CA-HM3 | Same electrical specs but SMB (DO-214AA) package - 25 % larger footprint and 10 % higher RθJA (135 °C/W) | Better surge energy absorption margin due to larger junction area; preferred for high-reliability 24 V systems with board space allowance | Choose when thermal derating headroom or legacy SMB layout compatibility is prioritized |
Compared with SMAJ30C-4HM3/I, SMAJ30CA-E3/61 offers identical clamping performance at lower cost but no automotive qualification, while SMBJ30CA-HM3 trades smaller PCB area for improved thermal robustness and higher surge endurance - critical for designs operating near thermal limits.
Availability
SMAJ30C-4HM3/I is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor nodes, and telecom power input stages requiring stable component supply with guaranteed long-term lifecycle support.
Supply support for SMAJ30C-4HM3/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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMAJ series delivers surface-mount TVS diodes optimized for high-speed transient suppression in automotive, industrial, and communications systems where compact size, AEC-Q101 compliance, and repeatable clamping behavior are essential.
FAQ
What does the "C" suffix indicate in SMAJ30C-4HM3/I?
The "C" in SMAJ30C-4HM3/I denotes bidirectional configuration, meaning the device provides symmetrical clamping for both positive and negative voltage transients. Unlike unidirectional variants (e.g., SMAJ30A), it has no cathode band marking and functions identically in either polarity - essential for protecting AC-coupled or differential signal lines where polarity reversal may occur.
Is SMAJ30C-4HM3/I qualified to AEC-Q101?
Yes, SMAJ30C-4HM3/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code structure: the "HM3" suffix indicates halogen-free, RoHS-compliant, and AEC-Q101-qualified construction. This qualification covers stress tests including temperature cycling, high-temperature operating life, and ESD robustness - required for automotive under-hood and chassis applications.
What is the maximum clamping voltage of SMAJ30C-4HM3/I and at what current is it specified?
The maximum clamping voltage (VC) of SMAJ30C-4HM3/I is 48.4 V, measured at a peak pulse current (IPPM) of 8.3 A using the standardized 10/1000 μs double-exponential waveform. This value represents the upper limit of voltage seen by protected circuitry during worst-case surge events, ensuring compatibility with 3.3 V, 5 V, and 24 V system interfaces.
How does the HM3 suffix differ from E3 or M3 in Vishay's SMAJ series?
The HM3 suffix in SMAJ30C-4HM3/I specifies halogen-free, RoHS-compliant construction with full AEC-Q101 qualification. In contrast, E3 denotes RoHS-compliant commercial grade (no AEC-Q101), and M3 adds halogen-free content but still lacks automotive qualification. Only HM3 and HE3 variants meet automotive reliability standards - critical for safety-critical or long-lifecycle deployments.
Can SMAJ30C-4HM3/I be used in place of SMAJ30A on the same PCB layout?
No - SMAJ30C-4HM3/I is bidirectional while SMAJ30A is unidirectional, and they share the same SMA (DO-214AC) package footprint but differ in polarity marking and internal structure. Substituting without circuit review risks improper clamping during negative transients. Layout reuse is physically possible, but functional equivalence requires verification of signal polarity, grounding scheme, and transient directionality in the target application.
SMAJ30C-4HM3/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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 30V
- Voltage - Breakdown (Min):
- 33.3V
- Voltage - Clamping (Max) @ Ipp:
- 53.5V
- Current - Peak Pulse (10/1000µs):
- 7.5A
- 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)
SMAJ30C-4HM3/I FAQ
1.How can I place an order for SMAJ30C-4HM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ30C-4HM3/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 SMAJ30C-4HM3/I reliable?
The price and inventory of SMAJ30C-4HM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ30C-4HM3/I is usually 5 days.
3.What payment methods are accepted for SMAJ30C-4HM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ30C-4HM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ30C-4HM3/I?
SMAJ30C-4HM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ30C-4HM3/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 SMAJ30C-4HM3/I?
For technical support, including SMAJ30C-4HM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ30C-4HM3/I requirements.
6.How does Aetrix verify that SMAJ30C-4HM3/I is sourced from the original manufacturer or authorized distributors?
All SMAJ30C-4HM3/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 SMAJ30C-4HM3/I meets industry standards.
7.What is the process for return or replacement of SMAJ30C-4HM3/I?
All SMAJ30C-4HM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ30C-4HM3/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 SMAJ30C-4HM3/I part is unused and in its original packaging.
Return procedure for SMAJ30C-4HM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ30C-4HM3/I Tags
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