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Vishay General Semiconductor - Diodes Division SMAJ30CAHE3/5A
- Part No.:
- SMAJ30CAHE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ30CAHE3/5A.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,957
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Product details
Overview
SMAJ30CAHE3/5A 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), 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 - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial control systems.
For engineers reviewing the SMAJ30CAHE3/5A datasheet, SMAJ30CAHE3/5A pinout, SMAJ30CAHE3/5A application, or SMAJ30CAHE3/5A equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, low clamping ratio (VC/VBR ≈ 1.42), MSL Level 1 moisture sensitivity, and compatibility with automated SMT assembly on 5.0 mm × 5.0 mm copper pads.
Technical Context
This device operates as a voltage-clamping protector with symmetrical avalanche breakdown in both directions, enabling suppression of positive and negative transients without polarity dependency. Its glass-passivated junction ensures stable leakage (<1.0 μA at 30 V) and fast response time (<1.0 ps), critical for protecting sensitive inputs against ESD and inductive switching spikes.
The SMAJ30CAHE3/5A delivers 400 W peak pulse power up to 78 V and derates to 300 W above that threshold, with thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead). It is rated for operating junction temperatures from –55 °C to +150 °C and meets UL 497B recognition (QVGQ2) for surge protection applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 30 V - Maximum continuous reverse voltage before significant conduction begins; defines safe operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 33.3–36.8 V at 1 mA - Voltage at which device enters avalanche; tight tolerance enables predictable turn-on behavior. |
| VC (Clamping Voltage) | 48.4 V at 8.3 A - Maximum voltage seen by protected circuit during 10/1000 μs transient; determines stress on downstream components. |
| PPPM (Peak Pulse Power) | 400 W (≤78 V), 300 W (>78 V) - Surge energy handling capacity under standardized waveform; defines transient robustness. |
| ID (Reverse Leakage) | ≤1.0 μA at 30 V - Low leakage preserves signal integrity and minimizes standby power loss in high-impedance circuits. |
| TJ Max | +150 °C - Enables reliable operation in under-hood automotive or industrial environments with elevated ambient temperatures. |
| AEC-Q101 Qualified | Yes - Validated for automotive electronics per stress test requirements including HTOL, TCT, and ESD HBM/MM. |
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; meets UL 94 V-0 flammability rating and MSL Level 1 (peak reflow 260 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (bidirectional) | One terminal of symmetrical PN junction; accepts surge current in either polarity during clamping event. |
| Cathode | Transient current entry (bidirectional) | Second terminal of symmetrical PN junction; no polarity marking on bidirectional devices like SMAJ30CAHE3/5A. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without external polarity management. |
| 400 W peak pulse power (10/1000 μs) | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-earth) when mounted on 5.0 mm × 5.0 mm copper pads. |
| AEC-Q101 qualified | Validated for automotive powertrain, body electronics, and ADAS modules requiring long-term reliability under thermal cycling and vibration. |
| Low clamping ratio (VC/VBR ≈ 1.42) | Minimizes overvoltage stress on protected ICs compared to higher-ratio suppressors, improving system-level immunity margin. |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free SMT processes without baking or special handling prior to assembly. |
Applications
| Automotive Sensor Interface Protection | Industrial PLC Digital I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., temperature, pressure) from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across differential or single-ended signal lines upstream of interface ICs. Use Value: Limits transient voltage to ≤48.4 V during 10/1000 μs surges, preventing latch-up or gate oxide damage in 3.3 V/5 V sensor signal chains. |
Use Scenario: Safeguarding 24 V digital input modules in programmable logic controllers against field-wiring induced transients and relay coil flyback. IC Role / Device Role / Timing Role: Parallel-connected TVS on each input channel to shunt surge energy before reaching optocoupler or Schmitt trigger input stage. Use Value: Maintains functional safety integrity by clamping 400 W surges without degradation, supporting SIL2-compliant industrial control designs. |
| Consumer Audio Equipment ESD Protection | Telecom Line Card Surge Suppression |
Use Scenario: Shielding line-in/line-out jacks and headphone amplifiers in smart speakers and AV receivers from human-body-model (HBM) ESD events. IC Role / Device Role / Timing Role: Low-capacitance TVS placed directly at connector pins to divert sub-nanosecond ESD strikes away from audio codec and amplifier ICs. Use Value: Sub-1.0 μA leakage at 30 V avoids DC offset in bias-sensitive analog audio paths while providing <1 ns response to ±8 kV contact discharge. |
Use Scenario: Front-end protection of Ethernet PHYs and DSL line drivers exposed to lightning-induced surges on twisted-pair telecom lines. IC Role / Device Role / Timing Role: Primary clamping device in multi-stage protection scheme, coordinated with GDTs and series impedance to meet ITU-T K.20/K.21 requirements. Use Value: Withstands repetitive 10/1000 μs surges up to 400 W, enabling compliance with GR-1089-CORE Level 3 (10 A, 600 V) telecom surge standards. |
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-M3/5A | Halogen-free, RoHS-compliant variant; identical electrical specs and AEC-Q101 qualification; same SMA package and pinout. | No functional difference; selected where halogen-free material compliance is mandated by OEM or regional environmental regulations. | Direct substitution when halogen-free bill-of-materials is required; no layout or firmware changes needed. |
| SMBJ30CAHE3/5A | Same VWM/VBR/VC ratings but in larger SMB (DO-214AA) package; higher thermal mass yields lower RθJA (85 °C/W vs. 120 °C/W) and higher IFSM (100 A vs. 40 A). | Better suited for high-energy surge environments (e.g., outdoor telecom cabinets) where PCB space allows larger footprint. | Choose when higher surge current endurance or improved thermal performance is prioritized over board area constraints. |
Compared with SMAJ30CAHE3/5A, the SMAJ30CA-M3/5A offers identical protection performance with halogen-free construction, while the SMBJ30CAHE3/5A trades compact size for greater surge current handling and thermal robustness - enabling design flexibility between miniaturization and ruggedness.
Availability
SMAJ30CAHE3/5A is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, consumer audio interfaces, and telecom line protection requiring stable component supply, AEC-Q101 validation, and consistent surge immunity performance across production batches.
Supply support for SMAJ30CAHE3/5A 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, TVS devices, and power MOSFETs with emphasis on reliability, precision, and application-specific optimization.
The SMAJ series was developed for high-reliability transient suppression in space-constrained, high-surge environments - targeting automotive, industrial, and communications systems where consistent clamping behavior and AEC-Q101 compliance are mandatory.
FAQ
What is the clamping voltage of SMAJ30CAHE3/5A at its rated peak pulse current?
The SMAJ30CAHE3/5A has a maximum clamping voltage (VC) of 48.4 V at 8.3 A peak pulse current (IPPM) under the 10/1000 μs waveform condition. This value is measured with the device mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per the Vishay datasheet, and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ30CAHE3/5A maintains this clamping performance across its full operating temperature range.
Is SMAJ30CAHE3/5A suitable for automotive applications?
Yes, SMAJ30CAHE3/5A is AEC-Q101 qualified and explicitly designated for automotive use with the "HE3" suffix indicating RoHS-compliant and AEC-Q101 qualified construction. It supports under-hood and cabin applications including engine control sensors, infotainment interfaces, and ADAS camera modules, meeting requirements for thermal cycling, humidity, and mechanical shock per the AEC standard. The SMAJ30CAHE3/5A's bidirectional clamping and 150 °C max junction temperature further reinforce its suitability for automotive environments.
How does the bidirectional configuration of SMAJ30CAHE3/5A affect its circuit placement?
The bidirectional configuration of SMAJ30CAHE3/5A eliminates polarity concerns during PCB layout - it can be placed across any two nodes requiring symmetrical transient suppression, such as differential signal pairs, AC-coupled lines, or floating power rails. Unlike unidirectional TVS diodes, SMAJ30CAHE3/5A has no cathode band marking and conducts identically in both directions, simplifying inventory management and reducing risk of incorrect orientation during automated placement. This makes SMAJ30CAHE3/5A ideal for protecting balanced interfaces like RS-485 or CAN FD.
What is the maximum reverse leakage current for SMAJ30CAHE3/5A at its standoff voltage?
The SMAJ30CAHE3/5A exhibits a maximum reverse leakage current (ID) of 1.0 μA at its 30 V standoff voltage (VWM), measured at 25 °C. This low leakage ensures minimal impact on high-impedance signal paths and battery-powered circuits, preserving accuracy in sensor front-ends and extending operational life in always-on systems. The SMAJ30CAHE3/5A maintains this specification across its full –55 °C to +150 °C operating junction temperature range, with only moderate increase at elevated temperatures.
Does SMAJ30CAHE3/5A require special PCB layout considerations for optimal surge performance?
Yes - optimal surge performance of SMAJ30CAHE3/5A requires mounting on minimum recommended pad layout: 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve its rated 400 W peak pulse power. Smaller pads reduce thermal dissipation and cause premature failure under repeated surges. Additionally, short, low-inductance traces between the SMAJ30CAHE3/5A and protected node are essential to minimize voltage overshoot during fast transients. The SMAJ30CAHE3/5A should be placed as close as possible to the connector or IC input being protected.
SMAJ30CAHE3/5A 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:
- 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)
SMAJ30CAHE3/5A FAQ
1.How can I place an order for SMAJ30CAHE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ30CAHE3/5A 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 SMAJ30CAHE3/5A reliable?
The price and inventory of SMAJ30CAHE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ30CAHE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ30CAHE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ30CAHE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ30CAHE3/5A?
SMAJ30CAHE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ30CAHE3/5A 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 SMAJ30CAHE3/5A?
For technical support, including SMAJ30CAHE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ30CAHE3/5A requirements.
6.How does Aetrix verify that SMAJ30CAHE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ30CAHE3/5A 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 SMAJ30CAHE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ30CAHE3/5A?
All SMAJ30CAHE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ30CAHE3/5A, 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 SMAJ30CAHE3/5A part is unused and in its original packaging.
Return procedure for SMAJ30CAHE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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