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Vishay General Semiconductor - Diodes Division SMAJ7.5CA-E3/61
- Part No.:
- SMAJ7.5CA-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ7.5CA-E3/61.pdf
- Description:
- TVS DIODE 7.5VWM 12.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,380
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Product details
Overview
SMAJ7.5CA-E3/61 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 test current, and clamps to ≤12.9 V at 31.0 A peak pulse current (IPPM) under 10/1000 μs waveform - protecting sensitive ICs, MOSFETs, and sensor interfaces in automotive and industrial systems.
For engineers reviewing the SMAJ7.5CA-E3/61 datasheet, SMAJ7.5CA-E3/61 pinout, SMAJ7.5CA-E3/61 application, or SMAJ7.5CA-E3/61 equivalent, key selection criteria include bidirectional surge capability, low clamping ratio (VC/VWM ≈ 1.72), AEC-Q101 qualification eligibility (via HE3 suffix variants), and compatibility with automated SMT assembly on standard PCB pad layouts.
Technical Context
This device operates as a voltage-clamping protector using an avalanche junction, responding in <1 ps to transient overvoltages. Its bidirectional symmetry enables protection of AC-coupled or differential signal paths without polarity constraints, and its 400 W peak pulse power rating (at ≤78 V) supports robust immunity against IEC 61000-4-5 Level 3 surges.
The SMAJ7.5CA-E3/61 exhibits a temperature coefficient of VBR of +0.067 %/°C and maintains stable leakage (<100 μA at VWM) across -55 °C to +150 °C operating range. Thermal resistance (RθJA = 120 °C/W) reflects standard SMA package performance on 5.0 mm × 5.0 mm copper pads, requiring no heatsink for typical transient duty cycles (0.01 %).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.5 V - Maximum continuous reverse working voltage before clamping initiates; defines safe operating margin for 5 V–6 V nominal signal/power rails. |
| VBR (min/max) | 8.33 V / 9.21 V at 1 mA - Confirmed breakdown threshold ensures reliable turn-on during fast transients while avoiding false triggering. |
| VC @ IPPM | ≤12.9 V at 31.0 A - Clamping voltage limits stress on downstream components; VC/VWM ratio of 1.72 indicates high suppression efficiency. |
| PPPM | 400 W (10/1000 μs) - Peak surge energy handling capacity suitable for lightning-induced and inductive-switching transients per IEC 61000-4-5. |
| IPPM | 31.0 A - Peak surge current capability validated under standardized waveform; derates linearly above TA = 25 °C per Fig. 2. |
| Junction Temp | -55 °C to +150 °C - Wide operational range supports under-hood automotive, industrial control, and outdoor telecom deployments. |
| Package | SMA (DO-214AC) - Low-profile, RoHS-compliant surface-mount package with matte tin-plated leads; MSL Level 1, reflow-compatible to 260 °C peak. |
Pinout & Package
Package: SMA (DO-214AC), bidirectional configuration - no polarity marking; symmetrical terminals enable mounting without orientation concern. Case outline conforms to JEDEC DO-214AC standard with 5.28 mm × 4.50 mm footprint and 2.29 mm height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (either direction) | Acts as cathode during positive half-cycle; accepts surge current from either terminal due to bidirectional avalanche structure. |
| Cathode | Transient current exit (either direction) | Acts as anode during negative half-cycle; completes low-impedance path to ground or return rail during clamping event. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses (e.g., RS-485, CAN), and ungrounded power rails without polarity constraints. |
| 400 W peak pulse power | Meets IEC 61000-4-5 surge immunity requirements for industrial and automotive electronics with minimal layout overhead. |
| Low clamping voltage (12.9 V) | Provides tighter voltage limiting than comparable 7.5 V-rated TVS devices, reducing risk of latch-up or gate oxide damage in protected MOSFETs/ICs. |
| AEC-Q101 qualification option | HE3/HM3 suffix variants are qualified for automotive applications - critical for ADAS sensors, body control modules, and infotainment power inputs. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow profiles (up to 260 °C), eliminating bake requirements and supporting high-yield SMT production. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine control units exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between sensor output and microcontroller ADC input, shunting transients before they reach ESD-sensitive circuitry. Use Value: Maintains signal integrity during 100 V/500 ms load dump events by clamping to ≤12.9 V, preventing ADC saturation and firmware lockup. |
Use Scenario: Safeguarding 24 V DC digital input channels on programmable logic controllers subjected to relay coil flyback and field wiring surges. IC Role / Device Role / Timing Role: Primary transient suppressor on each input channel, mounted directly at connector entry point to minimize inductance. Use Value: Absorbs 400 W surges without degradation, enabling >100,000 surge cycles per channel while maintaining VWM stability over lifetime. |
| Consumer USB Port Protection | Telecom Line Interface Protection |
Use Scenario: Shielding USB 2.0 D+/D- data lines in set-top boxes and smart displays from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS placed in series with data lines, leveraging symmetrical response for both signal polarities. Use Value: Adds <1 pF parasitic capacitance (per terminal), preserving signal rise time and ensuring USB 2.0 eye diagram compliance up to 480 Mbps. |
Use Scenario: Protecting Ethernet PHY interface pins (e.g., RJ45 magnetics secondary side) in VoIP phones and base stations from lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Secondary-level protector after gas discharge tube (GDT), clamping residual transients that pass through primary protection. Use Value: Delivers precise 12.9 V clamping to prevent PHY IC damage while coordinating with upstream GDT to handle >5 kV surges per ITU-T K.21. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ7.5CA-M3/61 | Halogen-free, RoHS-compliant variant with identical electrical specs and SMA package; same thermal and surge ratings. | No functional difference; selected when halogen-free material compliance is mandated by OEM environmental policy. | Direct substitution where halogen-free bill-of-materials is required; no design or layout changes needed. |
| SMAJ7.5A-E3/61 | Unidirectional version - cathode-banded, with forward voltage drop (~3.5 V at 25 A); same VWM, VBR, and VC ratings but asymmetric conduction. | Applicable only in DC-coupled, polarity-defined circuits (e.g., 12 V supply rail protection); unsuitable for AC or differential lines. | Select SMAJ7.5A-E3/61 only for unidirectional DC rails; SMAJ7.5CA-E3/61 remains mandatory for bidirectional signal integrity. |
Compared with SMAJ7.5CA-E3/61, the M3 variant offers identical protection performance with halogen-free construction, while the unidirectional SMAJ7.5A-E3/61 requires polarity-aware placement and cannot replace it in AC or differential applications - making SMAJ7.5CA-E3/61 the sole choice for symmetric surge suppression.
Availability
SMAJ7.5CA-E3/61 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, consumer USB ports, and telecom line interfaces requiring stable component supply, long-term lifecycle support, and AEC-Q101-qualified alternatives.
Supply support for SMAJ7.5CA-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, TVS devices, and optoelectronics with emphasis on reliability, precision, and automotive-grade qualification.
The SMAJ series was developed specifically for high-reliability transient suppression in space-constrained, high-surge environments - targeting automotive, industrial automation, and communications infrastructure where failure modes must be mitigated at the board level.
FAQ
What is the maximum clamping voltage of the SMAJ7.5CA-E3/61 under rated surge conditions?
The SMAJ7.5CA-E3/61 has a maximum clamping voltage (VC) of 12.9 V when subjected to its rated peak pulse current of 31.0 A under the standard 10/1000 μs waveform. This value is measured at TA = 25 °C and confirms the device's ability to limit transient voltage stress on protected circuitry while maintaining margin below typical 15 V absolute maximum ratings of many interface ICs. The SMAJ7.5CA-E3/61 achieves this with a clamping ratio (VC/VWM) of approximately 1.72.
Is SMAJ7.5CA-E3/61 suitable for automotive applications?
Yes - while the base SMAJ7.5CA-E3/61 is commercial-grade, Vishay offers AEC-Q101-qualified versions under the HE3 and HM3 suffixes (e.g., SMAJ7.5CAHE3_A). These variants undergo rigorous stress testing per AEC-Q101 and are approved for use in automotive powertrain, chassis, and body electronics. The SMAJ7.5CA-E3/61 itself shares identical electrical and thermal characteristics, enabling direct qualification path via suffix change without redesign.
How does the bidirectional design of SMAJ7.5CA-E3/61 affect PCB layout?
The SMAJ7.5CA-E3/61 has no polarity marking and functions identically regardless of orientation, simplifying PCB layout and automated placement. Unlike unidirectional TVS diodes, it eliminates the need for silkscreen polarity indicators or orientation verification during assembly. This symmetry also allows use in AC-coupled paths such as RS-485, CAN, or audio lines without concern for signal swing direction - a key advantage reflected in the SMAJ7.5CA-E3/61's consistent VBR and VC in both directions.
What is the thermal resistance of SMAJ7.5CA-E3/61, and how does it impact power dissipation?
The SMAJ7.5CA-E3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 5.0 mm × 5.0 mm copper pads per terminal. This value determines steady-state power handling: at 25 °C ambient, its 3.3 W rated power dissipation corresponds to a ~400 °C junction rise - but since TVS operation is transient, RθJA mainly affects recovery time between surges. For repetitive surges, thermal design must ensure average power stays within the SMAJ7.5CA-E3/61's 3.3 W limit.
Can SMAJ7.5CA-E3/61 be used in place of SMAJ7.5A-E3/61?
No - SMAJ7.5CA-E3/61 is bidirectional and lacks polarity marking, whereas SMAJ7.5A-E3/61 is unidirectional with a cathode band and forward voltage drop (~3.5 V at 25 A). Substituting SMAJ7.5CA-E3/61 for SMAJ7.5A-E3/61 in a DC rail may cause unintended conduction during normal operation if reverse bias exceeds VWM. The SMAJ7.5CA-E3/61 is only interchangeable where bidirectional clamping is explicitly required and circuit topology supports symmetrical protection.
SMAJ7.5CA-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:
- 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-E3/61 FAQ
1.How can I place an order for SMAJ7.5CA-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ7.5CA-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 SMAJ7.5CA-E3/61 reliable?
The price and inventory of SMAJ7.5CA-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 SMAJ7.5CA-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ7.5CA-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.5CA-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ7.5CA-E3/61?
SMAJ7.5CA-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ7.5CA-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 SMAJ7.5CA-E3/61?
For technical support, including SMAJ7.5CA-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.5CA-E3/61 requirements.
6.How does Aetrix verify that SMAJ7.5CA-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ7.5CA-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 SMAJ7.5CA-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ7.5CA-E3/61?
All SMAJ7.5CA-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.5CA-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 SMAJ7.5CA-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ7.5CA-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ7.5CA-E3/61 Tags
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