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Vishay General Semiconductor - Diodes Division SMAJ30CAHE3_A/I
- Part No.:
- SMAJ30CAHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ30CAHE3_A/I.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,051
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Product details
Overview
SMAJ30CAHE3_A/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on signal or power lines. It features a 30 V standoff voltage (VWM), 48.4 V maximum clamping voltage at 8.3 A peak pulse current (IPPM), and 400 W peak pulse power rating with 10/1000 μs waveform - suitable for protecting MOSFETs, ICs, and sensor interfaces in automotive and industrial control systems.
For engineers reviewing the SMAJ30CAHE3_A/I datasheet, SMAJ30CAHE3_A/I pinout, SMAJ30CAHE3_A/I application, or SMAJ30CAHE3_A/I equivalent, this device is evaluated for ESD and surge protection in bidirectional signal paths where low clamping voltage, fast response (<1 ns), and AEC-Q101 qualification are required.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional construction, enabling protection of AC-coupled or differential signal lines without polarity concerns. Its breakdown voltage (VBR) ranges from 33.3 V to 36.8 V at 1 mA test current, with temperature coefficient of 0.099 %/°C - ensuring stable clamping across automotive temperature range (–55 °C to +150 °C).
Mounted on standard 0.2" × 0.2" copper pads, it delivers 400 W peak pulse power up to 78 V; above that threshold, derated to 300 W. Thermal resistance junction-to-ambient is 120 °C/W, supporting operation under transient stress without thermal runaway when layout guidelines are followed.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V - maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 24 V nominal systems. |
| VBR min/max | 33.3 V / 36.8 V at 1 mA - ensures reliable turn-on during overvoltage events while avoiding false triggering near VWM. |
| VC @ IPPM | 48.4 V at 8.3 A - clamping voltage limits downstream component stress during 10/1000 μs surge; critical for 3.3 V/5 V logic interface protection. |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - peak transient energy absorption capability per JEDEC-standard waveform; supports IEC 61000-4-5 Level 3/4 compliance. |
| ID @ VWM | 1.0 μA - ultra-low leakage preserves signal integrity and battery life in always-on sensor circuits. |
| TJ max. | +150 °C - enables use in under-hood automotive environments and high-temperature industrial enclosures. |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock testing. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking - terminals are symmetrical and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals serve as identical surge current entry/exit points; no cathode band marking distinguishes polarity in bidirectional mode. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables robust protection against lightning-induced surges and inductive switching spikes in 24 V industrial buses. |
| AEC-Q101 qualified | Validates suitability for automotive powertrain, body electronics, and ADAS sensor interfaces requiring zero-defect reliability. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes voltage overshoot during transients, reducing risk of latch-up or gate oxide damage in protected MOSFETs and ICs. |
| MSL Level 1 (260 °C reflow) | Supports standard lead-free SMT assembly without moisture sensitivity concerns or baking requirements. |
| Glass passivated junction | Ensures long-term stability of breakdown characteristics and leakage performance under thermal cycling and humidity stress. |
Applications
| Automotive CAN Bus Protection | Industrial PLC Analog Input Protection |
|---|---|
Use Scenario: Protecting CAN_H/CAN_L differential pair from load dump and ESD in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional clamping element placed directly at connector entry point. Use Value: Limits transient voltage to ≤48.4 V, preserving ISO 11898-2 common-mode tolerance and preventing PHY damage. |
Use Scenario: Safeguarding 4–20 mA current loop inputs in programmable logic controllers exposed to field wiring surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on input terminals before signal conditioning amplifier. Use Value: Absorbs 400 W surges without degradation, maintaining analog accuracy and eliminating need for secondary protection stages. |
| Consumer Sensor Interface Protection | Telecom Power Supply Rail Clamping |
Use Scenario: Shielding I²C/SPI lines of MEMS sensors in smart home devices from human-body ESD events. IC Role / Device Role / Timing Role: Low-capacitance (≈150 pF) TVS placed adjacent to sensor IC pins. Use Value: Sub-1 ns response time prevents data corruption during ±8 kV contact discharge per IEC 61000-4-2. |
Use Scenario: Clamping 48 V telecom power rails against induced surges from nearby AC mains or relay switching. IC Role / Device Role / Timing Role: Secondary overvoltage suppression stage after primary DC/DC converter output filter. Use Value: Withstands repetitive 300 W pulses at 0.01% duty cycle, extending hold-up capacitor lifetime and system uptime. |
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-M3 | Same electrical specs; halogen-free, RoHS-compliant, commercial grade (non-AEC-Q101). | Lacks automotive qualification; suitable for industrial/commercial designs without automotive reliability mandates. | Select when AEC-Q101 is not required and halogen-free compliance is prioritized. |
| SMBJ30CAHE3_A/I | Same VWM/VC but in larger SMB (DO-214AA) package; 600 W PPPM rating; higher thermal mass. | Better suited for higher-energy transients or elevated ambient temperatures where SMA thermal resistance (120 °C/W) may be limiting. | Choose when board space allows and surge energy exceeds 400 W or junction temperature rise must be minimized. |
Compared with SMAJ30CAHE3_A/I, SMAJ30CA-M3 offers identical protection performance without automotive qualification, while SMBJ30CAHE3_A/I provides higher surge capacity and thermal robustness in a larger footprint - selection depends on reliability tier, energy requirement, and PCB area constraints.
Availability
SMAJ30CAHE3_A/I is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLCs, and telecom power systems requiring stable component supply with full AEC-Q101 traceability and RoHS compliance.
Supply support for SMAJ30CAHE3_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, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series targets high-reliability transient suppression in space-constrained surface-mount applications, especially where automotive qualification, low clamping voltage, and standardized packaging are essential.
FAQ
What is the clamping voltage of SMAJ30CAHE3_A/I at its rated peak pulse current?
The SMAJ30CAHE3_A/I has a maximum clamping voltage (VC) of 48.4 V at 8.3 A peak pulse current (IPPM), measured under the standard 10/1000 μs waveform. This value defines the upper voltage limit imposed on protected circuitry during surge events and is critical for ensuring compatibility with downstream 3.3 V or 5 V logic components. The SMAJ30CAHE3_A/I maintains this clamping performance across its full operating temperature range.
Is SMAJ30CAHE3_A/I suitable for automotive applications?
Yes, SMAJ30CAHE3_A/I is AEC-Q101 qualified and specifically designed for automotive use, including engine control units, body electronics, and ADAS sensor interfaces. Its construction meets stringent automotive reliability requirements such as temperature cycling, humidity bias, and mechanical shock testing. The HE3 suffix explicitly denotes AEC-Q101 qualification, making SMAJ30CAHE3_A/I appropriate for safety-critical and mission-critical vehicle subsystems.
How does the bidirectional configuration of SMAJ30CAHE3_A/I affect its circuit implementation?
The bidirectional configuration of SMAJ30CAHE3_A/I means it functions identically in both polarities - no cathode marking is present, and either terminal can serve as anode or cathode depending on transient polarity. This simplifies layout for AC-coupled or differential lines like CAN, RS-485, or audio interfaces, eliminating orientation errors during placement. Unlike unidirectional variants, SMAJ30CAHE3_A/I protects against positive and negative transients without requiring external polarity management.
What is the thermal resistance of SMAJ30CAHE3_A/I, and how does it impact PCB layout?
SMAJ30CAHE3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on minimum recommended 0.2" × 0.2" copper pads per terminal. This value assumes standard FR-4 PCB with no internal copper planes. To maintain safe junction temperatures during repetitive surges, designers should follow Vishay's pad layout recommendations - increasing copper area or adding thermal vias reduces effective RθJA and improves power handling. Exceeding TJ(max) = 150 °C risks parametric shift or failure.
Does SMAJ30CAHE3_A/I meet industry surge immunity standards such as IEC 61000-4-5?
SMAJ30CAHE3_A/I is engineered to support compliance with IEC 61000-4-5 Level 3 (1 kV line-earth, 2 kV line-line) and Level 4 (2 kV line-earth, 4 kV line-line) when implemented with proper PCB layout and system-level filtering. Its 400 W peak pulse power rating (10/1000 μs) aligns with the energy content of these waveforms. However, full system-level certification requires validation of the complete protection network - including series impedance, grounding, and upstream filtering - not just the SMAJ30CAHE3_A/I alone.
SMAJ30CAHE3_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:
- 48.4V
- Current - Peak Pulse (10/1000µs):
- 8.3A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ30CAHE3_A/I FAQ
1.How can I place an order for SMAJ30CAHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ30CAHE3_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 SMAJ30CAHE3_A/I reliable?
The price and inventory of SMAJ30CAHE3_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 SMAJ30CAHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ30CAHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ30CAHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ30CAHE3_A/I?
SMAJ30CAHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ30CAHE3_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 SMAJ30CAHE3_A/I?
For technical support, including SMAJ30CAHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ30CAHE3_A/I requirements.
6.How does Aetrix verify that SMAJ30CAHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ30CAHE3_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 SMAJ30CAHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ30CAHE3_A/I?
All SMAJ30CAHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ30CAHE3_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 SMAJ30CAHE3_A/I part is unused and in its original packaging.
Return procedure for SMAJ30CAHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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