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Vishay General Semiconductor - Diodes Division SMAJ30C-4HE3_A/I
- Part No.:
- SMAJ30C-4HE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ30C-4HE3_A/I.pdf
- Description:
- TVS DIODE 30VWM 53.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ30C-4HE3_A/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on signal and power lines. It features a 30 V standoff voltage (VWM), 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 in automotive sensor interfaces, industrial I/O protection, and telecom line surge suppression.
For engineers reviewing the SMAJ30C-4HE3_A/I datasheet, SMAJ30C-4HE3_A/I pinout, SMAJ30C-4HE3_A/I application, or SMAJ30C-4HE3_A/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, low thermal resistance (RθJL = 30 °C/W), and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This device operates as a voltage-clamping protector using an avalanche breakdown mechanism, with symmetrical bidirectional behavior enabling use on AC-coupled or floating signal paths without polarity concerns. Its glass-passivated junction ensures stable breakdown characteristics and fast response time (<1 ns), while the SMA package supports high surge current handling (IPPM = 8.3 A) under standardized 10/1000 μs transients.
The SMAJ30C-4HE3_A/I is rated for continuous operation from −55 °C to +150 °C, with thermal resistance from junction to lead of 30 °C/W - critical for reliability in thermally constrained automotive ECUs and industrial controllers. It meets MSL Level 1 per J-STD-020 and is qualified to AEC-Q101, confirming suitability for automotive-grade deployment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 30 V - maximum continuous reverse voltage before clamping initiates; defines operating margin below breakdown |
| VBR (Breakdown Voltage) | 33.3–36.8 V at 1 mA - guaranteed avalanche conduction onset range; ensures predictable clamping threshold |
| VC (Clamping Voltage) | 48.4 V at 8.3 A - peak voltage seen by protected circuit during 10/1000 μs surge; limits stress on downstream ICs |
| PPPM (Peak Pulse Power) | 400 W - energy-handling capacity for standard lightning/surge waveforms; derates above 78 V to 300 W |
| IPPM (Peak Pulse Current) | 8.3 A - maximum non-repetitive surge current supported; determines minimum PCB trace width and pad size |
| TJ max. | +150 °C - maximum junction temperature; enables use in under-hood automotive environments |
| RθJL | 30 °C/W - low junction-to-lead thermal resistance; allows effective heat transfer to PCB copper without heatsink |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. No polarity marking - bidirectional construction eliminates cathode/anode distinction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient current path | Both terminals function identically; bidirectional conduction enables placement across any two-point voltage node without orientation check |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control, ADAS sensors, and body electronics - supports long-term reliability under thermal cycling and vibration |
| 400 W peak pulse power (10/1000 μs) | Withstands IEC 61000-4-5 surge events up to 4 kV (line-to-earth) when properly laid out on 5.0 mm × 5.0 mm copper pads |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients - critical for protecting 3.3 V and 5 V logic interfaces |
| MSL Level 1 moisture sensitivity | Enables standard reflow without baking; compatible with high-volume SMT assembly at peak temperatures up to 260 °C |
| Glass passivated junction | Ensures stable VBR over lifetime and temperature; prevents parameter drift in humid or high-bias industrial environments |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/FlexRay transceiver inputs and analog sensor outputs (e.g., pressure, temperature) from load dump and ESD in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional clamping element placed directly at connector interface to shunt transients before reaching signal conditioning ICs. Use Value: Maintains signal integrity under ISO 7637-2 Pulse 5a (load dump) and IEC 61000-4-2 ESD (±15 kV air), enabled by 48.4 V clamping and AEC-Q101 qualification. | Use Scenario: Safeguarding digital input modules in programmable logic controllers against field-wiring surges and ground loop transients. IC Role / Device Role / Timing Role: Front-end TVS on 24 V DC input channels, mounted adjacent to terminal blocks to intercept induced surges before optocoupler isolation stages. Use Value: Prevents latch-up and permanent damage in microcontroller GPIOs via sub-50 V clamping and 8.3 A surge current handling on industrial-rated PCB layouts. |
| Telecom Line Interface | Consumer Appliance Motor Control |
Use Scenario: Surge protection on RS-485/RS-232 data lines in base stations and network equipment exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Differential-mode TVS across twisted-pair lines, leveraging bidirectional symmetry to handle both positive and negative transients without polarity constraints. Use Value: Enables compliance with ITU-T K.20/21 immunity standards due to consistent 48.4 V clamping and <1 ns response time across full temperature range. | Use Scenario: Suppressing commutation spikes from brushed DC motors in smart home appliances (e.g., washing machines, HVAC blowers). IC Role / Device Role / Timing Role: Across-motor terminals to clamp inductive kickback, reducing EMI and preventing reset events in motor driver MCUs. Use Value: Extends MCU lifespan by limiting voltage stress to ≤48.4 V during 8.3 ms half-sine surges up to 40 A peak, validated per IEC 61000-4-4 EFT testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ30CA-E3/61 | Same electrical specs and SMA package; RoHS-compliant commercial grade without AEC-Q101 qualification | Lacks automotive qualification - suitable for industrial/commercial designs where AEC-Q101 is not mandated | Select when cost-sensitive non-automotive applications require identical clamping performance without automotive validation overhead |
| SMCJ30CA | Higher 1500 W peak pulse power, larger SMC (DO-214AB) package, same VWM/VC ratings | Used where higher surge energy (e.g., AC mains input, outdoor telecom) demands greater robustness than 400 W | Choose when system-level surge testing exceeds IEC 61000-4-5 Level 4 and layout space permits larger footprint |
Compared with SMAJ30C-4HE3_A/I, SMAJ30CA-E3/61 offers identical protection performance but lacks AEC-Q101 validation - making it appropriate for cost-driven industrial designs. SMCJ30CA provides triple the pulse power in a larger package, targeting applications requiring higher energy absorption without changing clamping voltage.
Availability
SMAJ30C-4HE3_A/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom line protection, and consumer appliance motor control requiring stable component supply and AEC-Q101 assurance.
Supply support for SMAJ30C-4HE3_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, MOSFETs, and protection devices with emphasis on reliability, precision, and automotive-grade qualification.
The SMAJ series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where compact size, fast response, and AEC-Q101 compliance are mandatory design requirements.
FAQ
What is the clamping voltage of the SMAJ30C-4HE3_A/I under a 10/1000 μs surge?
The SMAJ30C-4HE3_A/I has a maximum clamping voltage (VC) of 48.4 V at 8.3 A peak pulse current with a 10/1000 μs waveform. This value is measured per standard test conditions and defines the upper voltage limit imposed on protected circuits during surge events - critical for ensuring downstream ICs remain within absolute maximum ratings. The SMAJ30C-4HE3_A/I achieves this clamping performance consistently across its operating temperature range.
Is the SMAJ30C-4HE3_A/I suitable for automotive applications?
Yes, the SMAJ30C-4HE3_A/I is AEC-Q101 qualified and explicitly designated for automotive use with the "HE3" suffix indicating RoHS-compliant and AEC-Q101 qualified construction. It is validated for under-hood and cabin environments with operating junction temperatures from −55 °C to +150 °C, and meets MSL Level 1 for reflow compatibility. The SMAJ30C-4HE3_A/I is commonly used in ADAS sensor interfaces, body control modules, and infotainment power rails.
Does the SMAJ30C-4HE3_A/I have polarity markings?
No, the SMAJ30C-4HE3_A/I is a bidirectional TVS diode and carries no polarity marking on the SMA (DO-214AC) package. Its symmetrical construction means both terminals perform identically - eliminating orientation concerns during placement. This simplifies automated assembly and supports use on AC-coupled or floating differential lines where polarity reversal may occur, unlike unidirectional variants such as SMAJ30A.
What is the thermal resistance from junction to lead for the SMAJ30C-4HE3_A/I?
The SMAJ30C-4HE3_A/I has a typical thermal resistance from junction to lead (RθJL) of 30 °C/W. This low value enables efficient heat transfer from the silicon die to the PCB copper through the device leads - essential for sustaining repeated surge events without thermal runaway. When mounted on 5.0 mm × 5.0 mm copper pads per datasheet recommendation, the SMAJ30C-4HE3_A/I maintains safe junction temperatures even at elevated ambient conditions.
How does the SMAJ30C-4HE3_A/I differ from the SMAJ30A variant?
The SMAJ30C-4HE3_A/I is bidirectional with symmetrical clamping in both directions, while the SMAJ30A is unidirectional and features a cathode band marking. Electrically, the SMAJ30C-4HE3_A/I has identical VWM (30 V), VBR (33.3–36.8 V), and VC (48.4 V) ratings but supports AC or floating signal protection without polarity constraints. The "C" suffix denotes bidirectional functionality, and "HE3" confirms AEC-Q101 qualification - distinguishing it from commercial-grade unidirectional alternatives.
SMAJ30C-4HE3_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:
- -
- 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-4HE3_A/I FAQ
1.How can I place an order for SMAJ30C-4HE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ30C-4HE3_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 SMAJ30C-4HE3_A/I reliable?
The price and inventory of SMAJ30C-4HE3_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 SMAJ30C-4HE3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ30C-4HE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ30C-4HE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ30C-4HE3_A/I?
SMAJ30C-4HE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ30C-4HE3_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 SMAJ30C-4HE3_A/I?
For technical support, including SMAJ30C-4HE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ30C-4HE3_A/I requirements.
6.How does Aetrix verify that SMAJ30C-4HE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ30C-4HE3_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 SMAJ30C-4HE3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ30C-4HE3_A/I?
All SMAJ30C-4HE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ30C-4HE3_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 SMAJ30C-4HE3_A/I part is unused and in its original packaging.
Return procedure for SMAJ30C-4HE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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