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Vishay General Semiconductor - Diodes Division SMAJ75CA-E3/61
- Part No.:
- SMAJ75CA-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ75CA-E3/61.pdf
- Description:
- TVS DIODE 75VWM 121VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,230
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Product details
Overview
SMAJ75CA-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 or power lines. It features a 75 V standoff voltage (VWM), 83.3–92.1 V breakdown voltage (VBR) at 1 mA, 121 V maximum clamping voltage (VC) at 3.3 A peak pulse current, and 400 W peak pulse power rating (10/1000 μs waveform). It is used to protect MOSFETs, ICs, and sensor signal lines in industrial and automotive electronics against ESD and inductive switching surges.
For engineers reviewing the SMAJ75CA-E3/61 datasheet, SMAJ75CA-E3/61 pinout, SMAJ75CA-E3/61 application, or SMAJ75CA-E3/61 equivalent, this device serves as a RoHS-compliant, AEC-Q101-qualified (via HE3/HM3 variants) transient suppressor with verified bidirectional clamping behavior, low incremental surge resistance, and MSL Level 1 moisture sensitivity rating for reflow compatibility.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, delivering identical clamping performance in forward and reverse directions - critical for AC-coupled or floating signal line protection. Its glass-passivated junction ensures stable leakage (<1.0 μA at 75 V) and fast response time (<1.0 ps), enabling suppression of sub-nanosecond transients induced by ESD or relay bounce.
The device is rated for 400 W peak pulse power up to 78 V and derates to 300 W above that threshold, with thermal resistance of 120 °C/W (junction-to-ambient) on standard 0.2" × 0.2" copper pads. Its 150 °C maximum junction temperature and -55 °C to +150 °C operating range support under-hood automotive and high-temperature industrial deployments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 75 V - Maximum continuous reverse stand-off voltage before significant leakage; defines safe operating margin below clamping onset. |
| VBR (min/max) | 83.3 V / 92.1 V at 1 mA - Verified breakdown threshold range; ensures consistent turn-on across production lots and temperature. |
| VC @ IPPM | 121 V at 3.3 A - Clamped voltage during 10/1000 μs surge; determines maximum stress imposed on downstream circuitry. |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - Peak transient energy absorption capability; defines survivability against repetitive or single-event surges. |
| IFSM | 40 A - Non-repetitive forward surge current rating (8.3 ms half-sine); supports robustness against accidental DC overvoltage events. |
| TJ max. | +150 °C - Maximum junction temperature; enables operation in engine control units, motor drives, and enclosed industrial enclosures. |
| Package | SMA (DO-214AC) - Surface-mount outline with 5.28 mm × 4.50 mm footprint and 2.29 mm height; compatible with automated pick-and-place and IR reflow. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, UL 94 V-0 rated, MSL Level 1 (peak reflow 260 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias (unidirectional mode); symmetrical node in bidirectional operation | No marking on SMAJ75CA-E3/61; terminals are electrically identical - polarity irrelevant for transient suppression function. |
| Cathode | Current exit terminal in forward bias (unidirectional mode); symmetrical node in bidirectional operation | No band or marking; bidirectional construction eliminates cathode/anode distinction - both terminals behave identically under surge conditions. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR, VC, and IPPM performance in both directions - eliminates need for polarity-aware layout on differential or AC signal paths. |
| 400 W peak pulse power | Validated with 10/1000 μs waveform per ANSI/IEEE C62.35 - meets IEC 61000-4-5 Level 4 surge immunity requirements when properly mounted. |
| Low clamping ratio (VC/VWM = 1.61) | 121 V clamping at 75 V standoff - minimizes voltage overshoot across protected ICs, reducing risk of latch-up or gate oxide damage. |
| MSL Level 1 rating | Zero floor life limitation; supports unlimited exposure to ambient humidity prior to reflow - simplifies inventory management and JIT assembly. |
| AEC-Q101 qualification path | Available via HE3/HM3 suffix variants - enables drop-in use in automotive ECUs, ADAS sensors, and body control modules without additional qualification effort. |
Applications
| Automotive Sensor Signal Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: Protecting CAN, LIN, or analog sensor inputs (e.g., pressure, temperature) from load dump and alternator ripple in 12 V vehicle systems. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between signal line and ground, responding within <1 ns to transients exceeding 75 V. Use Value: Prevents false triggering and permanent damage to microcontroller ADC inputs and transceiver PHY layers during ISO 7637-2 Pulse 5a events. |
Use Scenario: Shielding digital input channels of programmable logic controllers from inductive kickback caused by solenoid or relay coil de-energization. IC Role / Device Role / Timing Role: Fast-acting shunt element diverting >3 A surge current away from optocoupler input stages and upstream level shifters. Use Value: Extends mean time between failures (MTBF) of field I/O modules by limiting transient-induced degradation of isolation barriers and input conditioning resistors. |
| Consumer Power Adapter Output Clamp | Telecom Line Interface Surge Guard |
Use Scenario: Suppressing output overvoltage spikes in AC/DC adapters due to transformer leakage inductance or controller fault conditions. IC Role / Device Role / Timing Role: Secondary-side parallel clamp across regulated 5 V/12 V rails, activated only during abnormal overvoltage excursions. Use Value: Avoids catastrophic failure of connected USB peripherals or embedded devices by holding output below 121 V during fault conditions. |
Use Scenario: Protecting Ethernet PHY or DSL line driver ICs from lightning-induced surges entering via RJ-45 or telephone jacks. IC Role / Device Role / Timing Role: Primary-stage transient suppressor placed before gas discharge tube (GDT) or secondary TVS array in multi-stage telecom protection circuits. Use Value: Absorbs initial 400 W surge energy to prevent GDT follow-on current and enable clean coordination with downstream protection elements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ75A-E3/61 | Unidirectional version; same VWM, VBR, VC, and PPPM, but asymmetric conduction - conducts only in reverse bias. | Required where DC bias polarity is fixed and forward conduction must be blocked (e.g., DC power rail protection). | Select SMAJ75A-E3/61 only if circuit topology enforces known polarity and forward leakage must be minimized. |
| SMBJ75CA-E3/52 | Same electrical specs but in larger SMB (DO-214AA) package; 5.3 mm × 4.6 mm footprint, higher thermal mass, RθJA = 80 °C/W. | Better suited for high-repetition-rate surge environments or PCBs with limited copper area for heat spreading. | Choose SMBJ75CA-E3/52 when board layout allows larger footprint and thermal performance outweighs space constraints. |
Compared with SMAJ75A-E3/61, the SMAJ75CA-E3/61 offers polarity-agnostic protection ideal for AC or floating nodes, while SMBJ75CA-E3/52 trades compactness for enhanced thermal handling - making SMAJ75CA-E3/61 optimal for space-constrained, bidirectional signal line protection in automotive and industrial edge nodes.
Availability
SMAJ75CA-E3/61 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC inputs, consumer power adapter outputs, and telecom line interface circuits requiring stable component supply, RoHS compliance, and traceable sourcing.
Supply support for SMAJ75CA-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, MOSFETs, and protection devices with emphasis on reliability, precision, and automotive-grade qualification.
The SMAJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial automation, and telecom infrastructure where robustness against ESD, EFT, and surge events is non-negotiable.
FAQ
What is the clamping voltage of the SMAJ75CA-E3/61 under a 10/1000 μs surge?
The SMAJ75CA-E3/61 exhibits a maximum clamping voltage (VC) of 121 V when subjected to its rated peak pulse current of 3.3 A using the standardized 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in Vishay's datasheet revision 09-Jan-2024, Document Number 88390. The clamping performance remains identical in both directions due to its bidirectional construction, ensuring predictable protection for floating or AC-coupled signal paths.
Is the SMAJ75CA-E3/61 suitable for automotive applications?
Yes - while the base SMAJ75CA-E3/61 is commercial-grade, Vishay offers AEC-Q101-qualified versions under the HE3 and HM3 suffixes (e.g., SMAJ75CAHE3_A). These variants undergo rigorous stress testing per automotive reliability standards and are approved for use in engine control units, body electronics, and ADAS sensor modules. For full automotive qualification, specify the HE3 or HM3 variant; the SMAJ75CA-E3/61 itself meets all electrical and mechanical specs required for such applications but lacks formal AEC-Q101 certification.
How does the SMAJ75CA-E3/61 differ from the unidirectional SMAJ75A-E3/61?
The SMAJ75CA-E3/61 is bidirectional, meaning it clamps symmetrically in both polarities with identical VBR, VC, and IPPM characteristics - essential for protecting AC signals, differential pairs, or floating nodes. In contrast, the SMAJ75A-E3/61 is unidirectional and conducts only in reverse bias; its anode must be tied to ground or lower potential. Both share identical standoff (75 V), breakdown (83.3–92.1 V), and clamping (121 V) specs, but polarity awareness dictates layout and application scope.
What is the maximum operating temperature for the SMAJ75CA-E3/61?
The SMAJ75CA-E3/61 has a maximum junction temperature (TJ) of +150 °C and an operating junction/storage temperature range of -55 °C to +150 °C. Its thermal resistance is 120 °C/W (junction-to-ambient) when mounted on standard 0.2" × 0.2" copper pads. This rating enables reliable deployment in under-hood automotive environments, motor drive controls, and sealed industrial enclosures where ambient temperatures exceed 85 °C - provided PCB layout adheres to Vishay's recommended pad dimensions.
Does the SMAJ75CA-E3/61 require a heatsink for standard operation?
No external heatsink is required for the SMAJ75CA-E3/61 under typical transient suppression duty cycles. Its 3.3 W steady-state power dissipation (PD) and 120 °C/W junction-to-ambient thermal resistance are designed for operation on standard FR-4 PCBs with minimum recommended copper pads (0.2" × 0.2" per terminal). Heatsinking becomes relevant only in high-frequency surge repetition scenarios - for most IEC 61000-4-5 or ISO 7637-2 applications, proper PCB copper area suffices. The SMAJ75CA-E3/61 relies on short-duration pulse handling rather than continuous thermal management.
SMAJ75CA-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):
- 75V
- Voltage - Breakdown (Min):
- 83.3V
- Voltage - Clamping (Max) @ Ipp:
- 121V
- Current - Peak Pulse (10/1000µs):
- 3.3A
- 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)
SMAJ75CA-E3/61 FAQ
1.How can I place an order for SMAJ75CA-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ75CA-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 SMAJ75CA-E3/61 reliable?
The price and inventory of SMAJ75CA-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 SMAJ75CA-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ75CA-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ75CA-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ75CA-E3/61?
SMAJ75CA-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ75CA-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 SMAJ75CA-E3/61?
For technical support, including SMAJ75CA-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ75CA-E3/61 requirements.
6.How does Aetrix verify that SMAJ75CA-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ75CA-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 SMAJ75CA-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ75CA-E3/61?
All SMAJ75CA-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ75CA-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 SMAJ75CA-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ75CA-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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