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Vishay General Semiconductor - Diodes Division SMAJ7.5C-E3/5A
- Part No.:
- SMAJ7.5C-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ7.5C-E3/5A.pdf
- Description:
- TVS DIODE 7.5VWM 14.3VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,002
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Product details
Overview
SMAJ7.5C-E3/5A from Vishay General Semiconductor is a bi-directional surface-mount Transient Voltage Suppressor (TVS) in DO-214AC (SMA) package, designed for clamping voltage transients on signal or power lines. It features a 7.5 V stand-off voltage (VWM), 14.3 V maximum clamping voltage (VC) at 28.0 A peak pulse current (IPPM), and 400 W peak pulse power rating with 10/1000 µs waveform - suitable for protecting I/O ports and sensor interfaces in automotive and industrial control systems.
For engineers reviewing the SMAJ7.5C-E3/5A datasheet, SMAJ7.5C-E3/5A pinout, SMAJ7.5C-E3/5A application, or SMAJ7.5C-E3/5A equivalent, key selection criteria include bi-directional surge capability, low clamping ratio (VC/VWM = 1.91), RoHS-compliant matte tin terminals, MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on standard PCB copper pads.
Technical Context
This bi-directional TVS diode operates symmetrically in both polarities, with breakdown voltage (VBR) specified between 8.33 V (min) and 10.2 V (max) at 1.0 mA test current. Its clamping behavior is defined under standardized 10/1000 µs surge conditions, delivering 14.3 V clamping voltage at 28.0 A, enabling robust protection of downstream CMOS or analog circuitry against ESD and inductive switching spikes.
Thermal performance is characterized by 120 °C/W junction-to-ambient thermal resistance (RθJA) on 0.2 × 0.2" copper pads, and it supports operating junction temperatures from –55 °C to +150 °C. The device meets JESD201 Class 1A whisker resistance and is rated for 40 A non-repetitive forward surge current (IFSM) in uni-directional configurations - though SMAJ7.5C-E3/5A itself is bi-directional and unmarked per polarity convention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.5 V - Maximum continuous reverse working voltage before conduction begins; defines safe operating margin below clamping threshold. |
| VC @ IPPM | 14.3 V at 28.0 A - Clamped voltage during 10/1000 µs transient; ensures protected ICs see ≤14.3 V under worst-case surge. |
| PPPM | 400 W - Peak pulse power handling with 10/1000 µs waveform; enables suppression of high-energy transients without failure. |
| IPPM | 28.0 A - Peak surge current supported at VC; determines minimum trace width and layout robustness required. |
| VBR min/max | 8.33 V / 10.2 V at 1.0 mA - Validated breakdown range confirms reliable turn-on across process variation and temperature. |
| Leakage ID | 100 µA max at VWM - Low reverse leakage preserves signal integrity and battery life in always-on circuits. |
| Package | DO-214AC (SMA) - Standardized surface-mount outline with 0.208" body length; compatible with JEDEC MS-013 and IPC-7351B footprints. |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with two coplanar matte tin-plated leads; no polarity marking for bi-directional types; compliant with UL 94 V-0 flammability rating and J-STD-002 solderability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bi-directional transient conduction path | Either terminal serves as anode or cathode depending on transient polarity; no fixed polarity assignment required in layout. |
| Case (body) | Non-electrical mechanical interface | No internal connection; provides mechanical anchoring and thermal path via PCB copper pads per recommended 0.2 × 0.2" layout. |
Key Features
| Feature | Design Value |
|---|---|
| Bi-directional clamping | Enables single-device protection of AC-coupled or differential signal lines (e.g., RS-485, CAN, USB D+/D−) without polarity concerns. |
| 400 W peak pulse power | Supports IEC 61000-4-5 Level 4 (4 kV surge) compliance when combined with appropriate series impedance in front-end filtering. |
| Low clamping ratio (1.91) | Minimizes overvoltage stress on protected ICs - critical for 3.3 V or 5 V logic rails where VC must stay below absolute maximum ratings. |
| MSL Level 1 rating | Allows unlimited floor life and reflow without baking; simplifies manufacturing flow for high-volume SMT assembly. |
| RoHS-compliant & AEC-Q101 ready | E3 suffix denotes commercial-grade RoHS compliance; HE3 variant available for automotive applications requiring AEC-Q101 qualification. |
Applications
| Automotive Sensor Interface | Industrial PLC I/O Module |
|---|---|
Use Scenario: Protecting analog voltage outputs (e.g., 0–5 V throttle position sensor signals) from load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Bi-directional voltage clamp placed directly at connector entry point, shunting surges before reaching ADC input or op-amp buffer. Use Value: Prevents latch-up or permanent damage to microcontroller analog front-end while maintaining <100 µA leakage at 5 V nominal rail. |
Use Scenario: Safeguarding 24 V digital input channels in programmable logic controllers exposed to relay coil flyback and field wiring ESD. IC Role / Device Role / Timing Role: Primary transient suppressor on each discrete input line, coordinated with series resistor and optocoupler isolation stage. Use Value: Limits induced voltage to ≤14.3 V during 1 kV/500 A surge events, ensuring reliable optocoupler triggering without overstressing LED driver circuitry. |
| Consumer Audio Line Driver | Telecom Data Line Protection |
Use Scenario: Shielding line-level audio outputs (e.g., RCA or 3.5 mm jack) from human-body ESD and cable-induced transients in home theater receivers. IC Role / Device Role / Timing Role: Fast-response bi-directional clamp placed immediately after output amplifier, before EMI filter components. Use Value: Clamps ±8 kV contact ESD (IEC 61000-4-2) to <15 V within <1 ns, preserving signal fidelity and preventing pop/noise artifacts during discharge events. |
Use Scenario: Hardening Ethernet PHY or DSL line drivers against lightning-induced surges entering via RJ-45 jacks in residential gateways. IC Role / Device Role / Timing Role: First-stage protection element on each twisted pair, paired with common-mode choke and gas discharge tube for multi-level defense. Use Value: Absorbs up to 400 W of differential-mode surge energy while maintaining <0.5 pF junction capacitance at 0 V bias - avoiding signal integrity degradation at 100 Mbps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bi-directional TVS protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ7.5CA-E3/5A | Identical electrical specs and packaging; CA suffix denotes same bi-directional construction as C suffix per Vishay documentation. | No functional difference - CA and C suffixes are interchangeable for SMAJ7.5 in Vishay's naming convention. | Select SMAJ7.5C-E3/5A or SMAJ7.5CA-E3/5A based on distributor stock availability; both meet identical performance and reliability requirements. |
| SMBJ7.5C-E3/52 | Same VWM (7.5 V) and VC (14.3 V), but in larger DO-214AA (SMB) package with 600 W PPPM rating and higher IPPM (42.1 A). | Better suited for higher-energy surge environments (e.g., outdoor telecom enclosures); requires larger PCB footprint and different pad layout. | Choose SMBJ7.5C-E3/52 only if system-level testing confirms need for >400 W surge handling; otherwise SMAJ7.5C-E3/5A offers optimal size-performance balance. |
Compared with SMAJ7.5C-E3/5A, SMAJ7.5CA-E3/5A is functionally identical and interchangeable, while SMBJ7.5C-E3/52 trades compact DO-214AC form factor for higher surge capacity - making the SMAJ7.5C-E3/5A the preferred choice for space-constrained consumer and automotive modules requiring certified 400 W transient suppression.
Availability
SMAJ7.5C-E3/5A is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O hardening, and consumer audio line safeguarding requiring stable component supply and full traceability through Vishay's authorized channel.
Supply support for SMAJ7.5C-E3/5A 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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series is engineered for surface-mount transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where fast response, repeatable clamping, and AEC-Q101 readiness are essential design requirements.
FAQ
What is the polarity configuration of SMAJ7.5C-E3/5A?
SMAJ7.5C-E3/5A is a bi-directional TVS diode with symmetrical conduction characteristics in both directions. It has no polarity marking on the DO-214AC (SMA) package body, and either terminal functions as anode or cathode depending on transient polarity - eliminating orientation constraints during PCB layout and automated placement.
Does SMAJ7.5C-E3/5A meet automotive qualification standards?
SMAJ7.5C-E3/5A carries the E3 suffix indicating RoHS-compliant commercial grade. While not AEC-Q101 qualified itself, it belongs to the SMAJ family for which Vishay offers the HE3-suffixed variants (e.g., SMAJ7.5CHE3/5A) that are fully AEC-Q101 qualified for automotive use. For non-automotive industrial or consumer applications, SMAJ7.5C-E3/5A delivers identical electrical performance.
What is the maximum clamping voltage of SMAJ7.5C-E3/5A under surge conditions?
The maximum clamping voltage (VC) of SMAJ7.5C-E3/5A is 14.3 V, measured at its rated peak pulse current (IPPM) of 28.0 A using the standardized 10/1000 µs double-exponential waveform. This value is guaranteed across temperature and process variation per Vishay Document Number 88390, Revision 29-Oct-08.
How does SMAJ7.5C-E3/5A compare to uni-directional SMAJ7.5A-E3/5A?
SMAJ7.5C-E3/5A is bi-directional with no polarity band and symmetrical VBR and VC in both directions, whereas SMAJ7.5A-E3/5A is uni-directional with a cathode band and specified forward voltage drop (VF = 3.5 V at 25 A). The "C" suffix explicitly denotes bi-directional operation, making SMAJ7.5C-E3/5A suitable for AC or differential signal protection where polarity reversal occurs.
What PCB pad layout is recommended for optimal thermal and surge performance of SMAJ7.5C-E3/5A?
Vishay specifies a minimum 0.2 × 0.2" (5.0 × 5.0 mm) copper pad area per terminal for SMAJ7.5C-E3/5A to achieve rated 400 W peak pulse power and 120 °C/W RθJA. Use solid copper pours connected to ground or return planes via multiple thermal vias; avoid narrow traces between the device and pads to maintain low inductance and prevent voltage overshoot during fast transients.
SMAJ7.5C-E3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 7.5V
- Voltage - Breakdown (Min):
- 8.33V
- Voltage - Clamping (Max) @ Ipp:
- 14.3V
- Current - Peak Pulse (10/1000µs):
- 28A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ7.5C-E3/5A FAQ
1.How can I place an order for SMAJ7.5C-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ7.5C-E3/5A 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 SMAJ7.5C-E3/5A reliable?
The price and inventory of SMAJ7.5C-E3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ7.5C-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ7.5C-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.5C-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ7.5C-E3/5A?
SMAJ7.5C-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ7.5C-E3/5A 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 SMAJ7.5C-E3/5A?
For technical support, including SMAJ7.5C-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.5C-E3/5A requirements.
6.How does Aetrix verify that SMAJ7.5C-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ7.5C-E3/5A 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 SMAJ7.5C-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ7.5C-E3/5A?
All SMAJ7.5C-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.5C-E3/5A, 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 SMAJ7.5C-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ7.5C-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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