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Vishay General Semiconductor - Diodes Division SMAJ7.5-E3/61
- Part No.:
- SMAJ7.5-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ7.5-E3/61.pdf
- Description:
- TVS DIODE 7.5VWM 14.3VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,477
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Product details
Overview
SMAJ7.5-E3/61 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in DO-214AC (SMA) package, designed for clamping transient overvoltages on power and signal lines. It features a 7.5 V stand-off voltage (VWM), 8.33–10.2 V breakdown voltage (VBR at 1.0 mA), 14.3 V maximum clamping voltage (VC) at 28.0 A peak pulse current, and 400 W peak pulse power rating with 10/1000 µs waveform - suitable for protecting MOSFETs, ICs, and sensor interfaces in industrial power supplies.
For engineers reviewing the SMAJ7.5-E3/61 datasheet, SMAJ7.5-E3/61 pinout, SMAJ7.5-E3/61 application, or SMAJ7.5-E3/61 equivalent, key selection criteria include its unidirectional polarity, 1.0 µA max reverse leakage at VWM, 150 °C junction temperature rating, RoHS-compliant matte tin-plated leads, and MSL Level 1 moisture sensitivity per J-STD-020.
Technical Context
This TVS diode operates as a voltage-clamping protection device, conducting only when reverse voltage exceeds its breakdown threshold to divert surge energy away from downstream components. Its glass-passivated junction ensures stable avalanche characteristics and low incremental surge resistance.
The SMAJ7.5-E3/61 is rated for 400 W peak pulse power (derated above 78 V), supports 40 A non-repetitive forward surge current (8.3 ms half-sine), and exhibits fast response time (<1 ns) due to its PN-junction avalanche structure - enabling effective suppression of ESD, lightning-induced transients, and inductive switching spikes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 7.5 V - Maximum continuous reverse operating voltage before significant conduction begins; defines safe operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 8.33–10.2 V at 1.0 mA - Confirmed avalanche onset range; ensures reliable triggering during transients without premature conduction. |
| VC (Clamping Voltage) | 14.3 V at 28.0 A (10/1000 µs) - Peak voltage seen by protected circuit during worst-case surge; enables robust design margin for 5 V or 3.3 V logic rails. |
| PPPM (Peak Pulse Power) | 400 W - Sustained energy-handling capability under standardized 10/1000 µs surge; sufficient for IEC 61000-4-5 Level 3 (1 kV/2 Ω) compliance. |
| IPPM (Peak Pulse Current) | 28.0 A - Maximum surge current the device safely clamps; directly determines protection level against high-current transients. |
| TJmax | 150 °C - Maximum junction temperature; allows operation in high-ambient environments such as automotive engine compartments or industrial enclosures. |
| Package | DO-214AC (SMA) - Surface-mount outline with 0.208" x 0.157" footprint; compatible with automated placement and reflow soldering per J-STD-020 MSL Level 1. |
Pinout & Package
DO-214AC (SMA) package: two-terminal unidirectional device with cathode band marking on one end. Matte tin-plated leads meet J-STD-002 and JESD22-B102 solderability requirements. E3 suffix indicates RoHS-compliant commercial grade per JESD 201 Class 1A whisker test.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Surge return path | Connected to ground or low-impedance return plane; completes clamping loop during transient events. |
| Cathode (banded end) | Reverse-biased clamping node | Connected to protected line (e.g., VCC, signal); conducts when line voltage exceeds VBR, shunting surge to ground. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 µs) | Enables single-device protection against severe surges per IEC 61000-4-5, reducing need for cascaded protection stages. |
| Low clamping ratio (VC/VWM ≈ 1.9) | Minimizes voltage overshoot during clamping - critical for safeguarding 5 V-tolerant interfaces like USB, CAN, or RS-485 transceivers. |
| Glass-passivated junction | Ensures stable, repeatable avalanche behavior across temperature and lifetime; eliminates parameter drift under repeated surge stress. |
| MSL Level 1, 260 °C reflow compatible | Supports standard lead-free assembly without pre-baking; reduces manufacturing complexity and cost in high-volume production. |
| RoHS-compliant, JESD 201 Class 1A whisker tested | Meets global environmental regulations and mitigates tin whisker risk in long-life industrial and telecom applications. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of gate drivers and microcontroller I/O pins from inductive kickback during relay or solenoid switching in PLC output modules. IC Role / Device Role: Unidirectional TVS placed between MCU GPIO and external load interface to clamp negative transients to ground. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V logic inputs while maintaining signal integrity during 100 V/50 A inductive turn-off events. |
Use Scenario: Safeguarding LIN bus transceivers and sensor supply lines against load dump and jump-start transients in vehicle door modules. IC Role / Device Role: Standoff-rated TVS on 12 V rail upstream of LDO regulators feeding microcontrollers and Hall-effect sensors. Use Value: Limits voltage excursion to ≤14.3 V during 35 V/100 ms load dump pulses, preserving regulator input stage and downstream logic. |
| Consumer Power Adapters | Telecom Base Station Interfaces |
|
Use Scenario: Input-stage surge protection on secondary-side 5 V/12 V DC outputs of flyback converters in wall adapters and USB chargers. IC Role / Device Role: Primary clamping element on low-voltage output rail, coordinated with primary-side MOV and Y-cap filtering. Use Value: Absorbs residual common-mode surges escaping primary-side protection, ensuring <100 ns response to fast-rising ESD events on USB ports. |
Use Scenario: Signal-line protection for RS-485 data links connecting remote radio units to baseband processors in outdoor macrocells. IC Role / Device Role: Bidirectional-capable unidirectional TVS (with series resistor) on differential pair, referenced to local ground plane. Use Value: Maintains <15 pF junction capacitance to avoid signal integrity degradation at 10 Mbps, while clamping ±1 kV EFT bursts to <15 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ7.5A-E3/61 | Lower VBR range (8.33–9.21 V), tighter tolerance; 12.9 V clamping at 31.0 A; same package and power rating. | Better suited for precision 5 V rail protection where lower clamping voltage improves safety margin. | Select SMAJ7.5A-E3/61 when tighter VBR tolerance and lower VC are required for sensitive 3.3 V/5 V logic. |
| SMCJ7.5A-E3/73 | DO-214AB (SMC) package; higher PPPM = 1500 W; 11.3 V clamping at 133 A; larger footprint and thermal mass. | Used where higher surge energy (e.g., IEC 61000-4-5 Level 4) or improved thermal dissipation is needed. | Choose SMCJ7.5A-E3/73 only if system-level testing requires >400 W surge handling or board layout permits larger SMC package. |
Compared with SMAJ7.5-E3/61, the SMAJ7.5A-E3/61 offers tighter breakdown control and lower clamping for enhanced 5 V system margin, while the SMCJ7.5A-E3/73 provides triple the pulse power in a larger package - making SMAJ7.5-E3/61 the optimal balance of compactness, cost, and 400 W surge capability for space-constrained industrial and consumer designs.
Availability
SMAJ7.5-E3/61 is available at Aetrix Electronics and suitable for industrial motor drives, automotive body electronics, and consumer power adapter designs requiring stable component supply, RoHS compliance, and MSL Level 1 reflow compatibility.
Supply support for SMAJ7.5-E3/61 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 performance.
The SMAJ series was developed for surface-mount transient suppression in high-density PCBs across automotive, industrial, and telecom markets - prioritizing low profile, high surge capability, and process compatibility with automated assembly.
FAQ
What is the maximum clamping voltage of the SMAJ7.5-E3/61 under standard test conditions?
The SMAJ7.5-E3/61 has a maximum clamping voltage (VC) of 14.3 V when subjected to a 10/1000 µs waveform at 28.0 A peak pulse current. This value is measured per JEDEC standards and reflects the highest voltage imposed on the protected circuit during worst-case surge events - critical for verifying compatibility with 5 V logic families and ensuring safe operation margins in real-world applications.
Is the SMAJ7.5-E3/61 unidirectional or bidirectional, and how is polarity identified?
The SMAJ7.5-E3/61 is a unidirectional TVS diode, meaning it clamps only reverse-polarity transients relative to its cathode terminal. Polarity is marked by a visible cathode band on the DO-214AC (SMA) package body - the banded end is the cathode and must be connected toward the protected line (e.g., VCC or signal), while the anode connects to ground or return path.
Does the SMAJ7.5-E3/61 meet automotive qualification standards?
No, the SMAJ7.5-E3/61 is a commercial-grade part (E3 suffix) compliant with RoHS and JESD 201 Class 1A whisker testing, but not AEC-Q101 qualified. For automotive applications, Vishay offers the SMAJ7.5HE3/61 variant (HE3 suffix), which is AEC-Q101 qualified and rated for high-reliability automotive use - the SMAJ7.5-E3/61 is intended for industrial, consumer, and telecom systems.
What is the thermal resistance and maximum junction temperature rating of the SMAJ7.5-E3/61?
The SMAJ7.5-E3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and a maximum junction temperature (TJmax) of +150 °C. These values assume mounting on 0.2" × 0.2" copper pads per datasheet Fig. 2; actual thermal performance depends on PCB layout, copper area, and airflow - critical for sustained surge duty cycles in enclosed enclosures.
Can the SMAJ7.5-E3/61 be used for bidirectional transient protection?
No - the SMAJ7.5-E3/61 is strictly unidirectional and will not suppress positive-going transients on grounded lines. For bidirectional protection, Vishay specifies CA-suffix variants (e.g., SMAJ7.5CA-E3/61), which feature symmetrical breakdown in both directions. Using SMAJ7.5-E3/61 in bidirectional configurations risks failure during positive surges and violates its specified electrical characteristics.
SMAJ7.5-E3/61 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:
- 1
- Bidirectional Channels:
- -
- 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)
SMAJ7.5-E3/61 FAQ
1.How can I place an order for SMAJ7.5-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ7.5-E3/61 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 SMAJ7.5-E3/61 reliable?
The price and inventory of SMAJ7.5-E3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ7.5-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ7.5-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.5-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ7.5-E3/61?
SMAJ7.5-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ7.5-E3/61 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 SMAJ7.5-E3/61?
For technical support, including SMAJ7.5-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.5-E3/61 requirements.
6.How does Aetrix verify that SMAJ7.5-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ7.5-E3/61 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 SMAJ7.5-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ7.5-E3/61?
All SMAJ7.5-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.5-E3/61, 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 SMAJ7.5-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ7.5-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ7.5-E3/61 Tags
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