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Vishay General Semiconductor - Diodes Division SMAJ7.5CA-E3/5A
- Part No.:
- SMAJ7.5CA-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ7.5CA-E3/5A.pdf
- Description:
- TVS DIODE 7.5VWM 12.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,494
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Product details
Overview
SMAJ7.5CA-E3/5A 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 and power lines. It features a 7.5 V stand-off voltage (VWM), 8.33–9.21 V breakdown voltage (VBR) at 1 mA, 12.9 V maximum clamping voltage (VC) at 31.0 A peak pulse current (IPPM), 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 SMAJ7.5CA-E3/5A datasheet, SMAJ7.5CA-E3/5A pinout, SMAJ7.5CA-E3/5A application, or SMAJ7.5CA-E3/5A equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VWM ≈ 1.72), AEC-Q101 qualification eligibility (via HE3/HM3 variants), MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, delivering identical electrical characteristics in forward and reverse directions. Its glass-passivated junction enables fast response time (<1 ns), low incremental surge resistance, and stable clamping under repetitive 10/1000 μs transients at 0.01% duty cycle.
The device is rated for -55 °C to +150 °C operating junction temperature, with thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead). It meets UL 497B recognition (QVGQ2) and complies with JESD201 Class 2 whisker resistance and J-STD-020 MSL Level 1 reflow profile (peak 260 °C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.5 V - Maximum continuous reverse stand-off voltage before significant leakage; defines safe operating margin below clamping threshold. |
| VBR min/max | 8.33 V / 9.21 V at 1.0 mA - Verified breakdown range ensures consistent turn-on behavior across production lots. |
| VC @ IPPM | 12.9 V at 31.0 A - Clamping voltage during 10/1000 μs surge; limits downstream voltage stress to protected circuitry. |
| PPPM | 400 W - Peak pulse power handling capacity with standard 10/1000 μs waveform; supports IEC 61000-4-5 level 4 immunity. |
| ID @ VWM | 100 μA - Maximum reverse leakage at 7.5 V; low enough to avoid interference in high-impedance sensor or logic lines. |
| TJ max | +150 °C - Maximum junction temperature rating enables use in under-hood automotive and industrial environments. |
| Package | SMA (DO-214AC) - Surface-mount outline with 5.28 mm × 4.50 mm footprint; compatible with standard 7" and 13" tape-and-reel feeders. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, polarity-unmarked for bidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Terminal A | One side of symmetrical PN junction; forms clamping path in either polarity when transient exceeds VBR. |
| Cathode | Terminal K | Other side of symmetrical PN junction; no band marking distinguishes terminals in bidirectional configuration. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR, VC, and IPPM in both directions - eliminates need for polarity-aware layout in differential or AC-coupled lines. |
| 400 W peak pulse power | Rated per 10/1000 μs waveform - provides robust protection against lightning-induced surges and inductive switching spikes. |
| Low clamping ratio | VC/VWM = 1.72 - minimizes overvoltage exposure to downstream ICs while maintaining noise margin. |
| AEC-Q101 readiness | HE3/HM3 variants qualified - supports automotive subsystems requiring reliability validation without redesign. |
| MSL Level 1 | No floor life limitation - allows indefinite storage and standard reflow without baking preconditioning. |
Applications
| Automotive Body Control Module | Industrial Sensor Interface |
|---|---|
|
Use Scenario: Protecting LIN bus transceivers and microcontroller GPIOs from load dump and alternator ripple in door modules and lighting controllers. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector entry point to shunt transients before reaching sensitive analog/digital inputs. Use Value: Withstands 400 W surges while limiting clamped voltage to 12.9 V - within absolute maximum ratings of 5 V and 12 V automotive MCUs and transceivers. |
Use Scenario: Safeguarding 4–20 mA current loop receivers and RS-485 transceivers in factory automation PLC I/O modules exposed to motor drive noise. IC Role / Device Role / Timing Role: Low-capacitance TVS placed across differential pair or supply rail to suppress EFT bursts and surge coupling without distorting signal integrity. Use Value: 100 μA leakage at 7.5 V avoids loading precision current-sense circuits; 12.9 V clamping prevents latch-up in ±15 V powered instrumentation amplifiers. |
| Consumer Power Adapter Feedback Path | Telecom DSL Line Interface |
|
Use Scenario: Shielding optocoupler feedback pins and TL431 reference inputs in isolated AC/DC adapters from primary-side switching noise and secondary-side load transients. IC Role / Device Role / Timing Role: Fast-response TVS connected between COMP and REF pins to clamp sub-100 ns ringing without affecting regulation loop stability. Use Value: Sub-1 ns response time and 12.9 V clamping ensure feedback node remains within TL431's 2.5 V ± 0.1 V reference tolerance window during transient events. |
Use Scenario: Protecting ADSL/VDSL line drivers and SLIC front-ends from induced surges on twisted-pair telephone lines in residential gateways. IC Role / Device Role / Timing Role: Bidirectional TVS installed across line pair (tip/ring) to absorb longitudinal-mode surges while preserving common-mode rejection. Use Value: Symmetrical 8.33–9.21 V VBR ensures balanced clamping on both conductors - critical for maintaining DSL signal SNR above 1 MHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ7.5CA-M3/5A | Halogen-free, RoHS-compliant variant with identical electrical specs and SMA package. | No difference in circuit function or layout; selected where halogen-free compliance is mandated by OEM or regional regulations. | Choose SMAJ7.5CA-M3/5A when environmental compliance requires halogen-free materials without altering design or test plans. |
| SMAJ7.5AHE3_A/I | AEC-Q101 qualified version with same VWM, VBR, and VC; differs only in qualification testing and traceability documentation. | Required for automotive safety-critical modules (e.g., ADAS sensors, body ECUs) needing formal reliability certification. | Select SMAJ7.5AHE3_A/I when automotive program requirements mandate AEC-Q101 evidence - not for generic industrial use. |
Compared with SMAJ7.5CA-E3/5A, the M3 variant adds halogen-free assurance without performance trade-offs, while the HE3 variant delivers formal automotive qualification - enabling tiered sourcing strategies across commercial, industrial, and automotive programs without PCB redesign.
Availability
SMAJ7.5CA-E3/5A is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, consumer power adapter feedback networks, and telecom line protection requiring stable component supply and full traceability.
Supply support for SMAJ7.5CA-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, TVS devices, and power MOSFETs with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series was developed for high-energy transient suppression in space-constrained SMT designs, targeting automotive, industrial, and communications systems where robustness, fast response, and standardized packaging are essential.
FAQ
What is the clamping voltage of the SMAJ7.5CA-E3/5A under a 10/1000 μs surge?
The SMAJ7.5CA-E3/5A exhibits a maximum clamping voltage (VC) of 12.9 V when subjected to its rated peak pulse current of 31.0 A using the standard 10/1000 μs waveform. This value is measured at the device terminals under specified test conditions (TA = 25 °C, mounted on 5.0 mm × 5.0 mm copper pads), and represents the upper limit of voltage seen by downstream circuitry during transient events.
Is the SMAJ7.5CA-E3/5A suitable for automotive applications?
The SMAJ7.5CA-E3/5A itself is commercial-grade; however, its automotive-qualified counterpart SMAJ7.5AHE3_A/I is AEC-Q101 certified. For non-safety-critical automotive functions like infotainment USB ports or interior lighting, SMAJ7.5CA-E3/5A may be used subject to system-level validation - but SMAJ7.5CA-E3/5A does not carry AEC-Q101 qualification or associated test reports.
How does the bidirectional configuration of SMAJ7.5CA-E3/5A affect its PCB layout?
The SMAJ7.5CA-E3/5A has no polarity marking and identical electrical behavior in both directions, so PCB layout requires no orientation alignment - either terminal can connect to either side of a differential line or AC-coupled signal path. This simplifies routing and eliminates risk of assembly error, unlike unidirectional TVS diodes that require cathode-band alignment.
What is the maximum steady-state power dissipation for SMAJ7.5CA-E3/5A?
The SMAJ7.5CA-E3/5A has a maximum steady-state power dissipation (PD) of 3.3 W at TA = 50 °C on an infinite heatsink. In typical surface-mount applications without additional heatsinking, derating applies per the datasheet's thermal curves - actual usable DC power is limited by board layout, copper area, and ambient temperature, often falling below 0.5 W in standard 2-layer FR-4 designs.
Does SMAJ7.5CA-E3/5A meet UL recognition requirements?
Yes, the SMAJ7.5CA-E3/5A is Underwriters Laboratory recognized under UL 497B (QVGQ2) for protector classification, covering both unidirectional and bidirectional configurations. This recognition applies to the entire SMAJ family and confirms suitability for use in telecommunications and data line protection where UL listing is required.
SMAJ7.5CA-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:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 7.5V
- Voltage - Breakdown (Min):
- 8.33V
- Voltage - Clamping (Max) @ Ipp:
- 12.9V
- Current - Peak Pulse (10/1000µs):
- 31A
- 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)
SMAJ7.5CA-E3/5A FAQ
1.How can I place an order for SMAJ7.5CA-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ7.5CA-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 SMAJ7.5CA-E3/5A reliable?
The price and inventory of SMAJ7.5CA-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 SMAJ7.5CA-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ7.5CA-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.5CA-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ7.5CA-E3/5A?
SMAJ7.5CA-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ7.5CA-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 SMAJ7.5CA-E3/5A?
For technical support, including SMAJ7.5CA-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.5CA-E3/5A requirements.
6.How does Aetrix verify that SMAJ7.5CA-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ7.5CA-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 SMAJ7.5CA-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ7.5CA-E3/5A?
All SMAJ7.5CA-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.5CA-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 SMAJ7.5CA-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ7.5CA-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ7.5CA-E3/5A Tags
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