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Vishay General Semiconductor - Diodes Division SMAJ30C-4HE3/5A
- Part No.:
- SMAJ30C-4HE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ30C-4HE3/5A.pdf
- Description:
- TVS DIODE 30VWM 53.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,701
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Product details
Overview
SMAJ30C-4HE3/5A 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 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 SMAJ30C-4HE3/5A datasheet, SMAJ30C-4HE3/5A pinout, SMAJ30C-4HE3/5A application, or SMAJ30C-4HE3/5A equivalent, this part delivers AEC-Q101 qualified transient suppression for bidirectional signal lines where low-profile mounting, fast response (<1 ps), and stable clamping under repetitive surges are required.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical electrical characteristics in forward and reverse directions. Its glass-passivated junction ensures low leakage (<1.0 μA at VWM) and stable breakdown behavior over temperature, while the SMA package supports automated placement and meets MSL Level 1 reflow requirements (260 °C peak).
The device complies with ANSI/IEEE C62.35 surge standards and is rated for 400 W peak pulse power up to 78 V; above that threshold, derating applies to 300 W. It sustains 40 A non-repetitive forward surge (8.3 ms half-sine) and exhibits a typical thermal resistance of 120 °C/W (junction-to-ambient) on standard 5.0 mm × 5.0 mm copper pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 30 V - Maximum continuous reverse voltage before significant leakage; defines operating margin below clamping threshold |
| VBR (Breakdown Voltage) | 33.3–36.8 V at 1 mA - Confirmed breakdown range ensuring reliable turn-on during transients |
| VC (Clamping Voltage) | 48.4 V at IPPM = 8.3 A - Peak voltage seen by protected circuit during 10/1000 μs surge |
| PPPM (Peak Pulse Power) | 400 W - Sustained energy absorption capability for standard lightning/surge waveforms |
| IPPM (Peak Pulse Current) | 8.3 A - Maximum surge current handled at VC, directly limiting protection level for downstream components |
| TJ Range | −55 °C to +150 °C - Full operational junction temperature range supporting automotive under-hood and industrial environments |
| Package | SMA (DO-214AC) - Surface-mount outline with 5.28 mm length, 4.50 mm width, and 2.29 mm height for space-constrained PCB layouts |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, RoHS-compliant and AEC-Q101 qualified (HE3 suffix). Polarity marking: none for bidirectional types.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional terminal pair | No polarity distinction - either terminal serves as anode or cathode depending on transient polarity; enables single-device protection of AC or differential lines |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables robust protection against IEC 61000-4-5 Level 3/4 surges without external heat sinking |
| AEC-Q101 qualified (HE3 suffix) | Validated for automotive applications including engine control units and body electronics requiring reliability certification |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., inductive switch-off), improving clamping precision |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free SMT assembly without moisture sensitivity concerns or baking requirements |
| Glass passivated junction | Ensures stable VBR tolerance and low leakage (<1.0 μA) across temperature and lifetime |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ESD events in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional clamping element placed directly at connector interface to limit line voltage to safe levels before reaching sensitive receiver circuitry. Use Value: Maintains signal integrity during 10/1000 μs surges up to 8.3 A while holding clamped voltage ≤48.4 V - within absolute maximum ratings of ISO 11898-compliant transceivers. |
Use Scenario: Safeguarding 24 V DC digital input modules in programmable logic controllers against field-wiring transients and relay contact bounce. IC Role / Device Role / Timing Role: Standoff-rated TVS shunting surge energy away from optocoupler input stages and microcontroller GPIO pins. Use Value: Withstands repeated 400 W pulses without degradation, enabling long-term reliability in factory automation environments with frequent switching noise. |
| Consumer USB Port Protection | Telecom Line Interface Protection |
Use Scenario: Secondary-level surge suppression on USB 2.0 data lines (D+/D−) in set-top boxes and smart displays exposed to user-accessible ports. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp minimizing signal distortion while meeting IEC 61000-4-2 ±15 kV contact discharge requirements. Use Value: Clamps transients within nanoseconds and holds VC ≤48.4 V - preserving eye diagram integrity and preventing PHY layer latch-up. |
Use Scenario: Protecting RS-485 transceiver terminals in base station backhaul equipment from induced lightning surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary front-end TVS on differential bus lines, coordinated with GDT or MOV secondary protection stages. Use Value: Delivers 400 W pulse handling with symmetrical clamping - essential for maintaining common-mode rejection and preventing differential skew during surge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ30CA-E3/5A | Same electrical specs and AEC-Q101 qualification; differs only in packaging suffix (E3 vs HE3) - E3 is commercial grade, HE3 denotes automotive qualification | Not rated for automotive use; suitable for industrial/commercial designs without AEC-Q101 requirement | Select SMAJ30CA-E3/5A when automotive qualification is unnecessary and cost optimization is prioritized |
| SMBJ30CA-TP | Higher 600 W PPPM rating, SMB (DO-214AA) package with larger pad area; otherwise matches VWM, VBR, and VC specs | Better suited for high-energy surge environments (e.g., outdoor telecom); requires larger PCB footprint | Choose SMBJ30CA-TP when system-level surge testing exceeds IEC 61000-4-5 Level 4 and board space permits larger package |
Compared with SMAJ30C-4HE3/5A, SMAJ30CA-E3/5A offers identical protection performance without automotive qualification, while SMBJ30CA-TP provides higher surge margin at the cost of increased size - enabling design flexibility across commercial, industrial, and harsh-environment applications.
Availability
SMAJ30C-4HE3/5A is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, consumer USB port protection, and telecom line interface circuits requiring stable component supply and AEC-Q101 compliance.
Supply support for SMAJ30C-4HE3/5A 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, efficiency, and application-specific validation.
The SMAJ series was developed for high-reliability transient suppression in space-constrained, high-volume surface-mount applications - particularly targeting automotive, industrial, and communications infrastructure where consistent clamping and AEC-Q101 compliance are mandatory.
FAQ
What does the "C" suffix in SMAJ30C-4HE3/5A indicate?
The "C" in SMAJ30C-4HE3/5A denotes bidirectional configuration - meaning the device provides symmetrical transient suppression in both polarities, unlike unidirectional variants (e.g., SMAJ30A). This allows single-device protection of AC-coupled or differential signal lines without polarity concerns, and is confirmed in Vishay's datasheet Document Number 88390 under "DEVICES FOR BIDIRECTION APPLICATIONS".
Is SMAJ30C-4HE3/5A AEC-Q101 qualified?
Yes, SMAJ30C-4HE3/5A is AEC-Q101 qualified, as indicated by the "HE3" suffix per Vishay's ordering information table (page 3 of Document 88390). This qualification covers stress testing for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock - making SMAJ30C-4HE3/5A suitable for under-hood and chassis-mounted electronics.
What is the clamping voltage of SMAJ30C-4HE3/5A at its rated peak pulse current?
The maximum clamping voltage (VC) of SMAJ30C-4HE3/5A is 48.4 V at 8.3 A peak pulse current (IPPM) with a 10/1000 μs waveform, as specified in the "ELECTRICAL CHARACTERISTICS" table (page 2 of Document 88390). This value defines the upper voltage limit imposed on protected circuitry during standardized surge events.
Can SMAJ30C-4HE3/5A be used in place of a unidirectional TVS like SMAJ30A?
No - SMAJ30C-4HE3/5A is bidirectional and lacks polarity marking, while SMAJ30A is unidirectional with cathode band identification. Substituting them requires verifying circuit topology: SMAJ30C-4HE3/5A suits AC, differential, or floating lines; SMAJ30A is required for DC-biased single-ended paths where forward conduction must be blocked. The datasheet explicitly separates these types in marking codes and electrical tables.
What is the thermal resistance of SMAJ30C-4HE3/5A, and how does it affect layout?
SMAJ30C-4HE3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, per the "THERMAL CHARACTERISTICS" table (page 3 of Document 88390). To maintain safe operation under repetitive surges, PCB layout must replicate this minimum pad area - undersized traces or insufficient copper will cause excessive junction temperature rise and premature failure.
SMAJ30C-4HE3/5A 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:
- 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-4HE3/5A FAQ
1.How can I place an order for SMAJ30C-4HE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ30C-4HE3/5A 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 SMAJ30C-4HE3/5A reliable?
The price and inventory of SMAJ30C-4HE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ30C-4HE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ30C-4HE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ30C-4HE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ30C-4HE3/5A?
SMAJ30C-4HE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ30C-4HE3/5A 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 SMAJ30C-4HE3/5A?
For technical support, including SMAJ30C-4HE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ30C-4HE3/5A requirements.
6.How does Aetrix verify that SMAJ30C-4HE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ30C-4HE3/5A 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 SMAJ30C-4HE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ30C-4HE3/5A?
All SMAJ30C-4HE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ30C-4HE3/5A, 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 SMAJ30C-4HE3/5A part is unused and in its original packaging.
Return procedure for SMAJ30C-4HE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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