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Vishay General Semiconductor - Diodes Division SMAJ85CA-E3/61
- Part No.:
- SMAJ85CA-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ85CA-E3/61.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,630
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Product details
Overview
SMAJ85CA-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 85 V stand-off voltage (VWM), 94.4–104 V breakdown voltage (VBR) at 1 mA, 137 V maximum clamping voltage (VC) at 2.2 A peak pulse current (IPPM), and 400 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor signal lines in automotive and industrial electronics.
For engineers reviewing the SMAJ85CA-E3/61 datasheet, SMAJ85CA-E3/61 pinout, SMAJ85CA-E3/61 application, or SMAJ85CA-E3/61 equivalent, key selection criteria include bidirectional clamping capability, 137 V VC under 2.2 A surge, RoHS-compliant matte tin terminals, MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates symmetrically in both directions due to its CA suffix configuration, enabling protection of AC-coupled or differential signal paths without polarity constraints. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 μA at 85 V), while the 30 °C/W junction-to-lead thermal resistance supports reliable energy dissipation during transient events.
The device complies with ANSI/IEEE C62.35 surge standards and delivers fast response time (<1.0 ps) to suppress ESD and inductive switching spikes. Derating above 25 °C ambient is defined per Figure 2, with full 400 W rating maintained up to TJ = 25 °C and reduced to 300 W above 78 V standoff in repetitive operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 94.4 V / 104 V at 1 mA - guaranteed breakdown range defining turn-on threshold |
| VC @ IPPM | 137 V at 2.2 A - clamped voltage seen by protected circuit during 10/1000 μs surge |
| PPPM | 400 W - peak transient power handling capability with standard 10/1000 μs waveform |
| ID @ VWM | <1.0 μA - ultra-low reverse leakage ensuring minimal standby power loss |
| TJ max | +150 °C - maximum junction temperature supporting operation in under-hood automotive environments |
| Package | SMA (DO-214AC) - industry-standard surface-mount outline with 5.28 mm length and 4.50 mm width |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, compliant with J-STD-002 and JESD 22-B102 solderability standards. Bidirectional construction means no polarity marking; both terminals are electrically symmetrical.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals serve identical roles; current flows bidirectionally during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC, differential, or floating signal lines without polarity concerns |
| 400 W peak pulse power | Handles high-energy transients from inductive load switching in motor control and power supply rails |
| MSL Level 1 rating | Allows unlimited floor life and reflow at 260 °C peak, compatible with standard lead-free assembly |
| Glass passivated junction | Ensures long-term stability of VBR and low parameter drift across temperature and lifetime |
| RoHS-compliant E3 suffix | Meets environmental compliance requirements for commercial-grade industrial and consumer applications |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
Use Scenario: Protecting CAN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Voltage clamping element placed directly at connector entry point to shunt surge energy before reaching downstream ICs. Use Value: Limits transient voltage to ≤137 V during 2.2 A surges, preventing latch-up or gate oxide damage in 5 V–12 V sensor front-ends. |
Use Scenario: Safeguarding PLC digital input modules against field-wiring induced transients from relay coils or solenoid drivers. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 24 V DC input lines, mounted adjacent to terminal block entry. Use Value: Withstands repeated 400 W surges while maintaining <1.0 μA leakage at 85 V, minimizing false triggering in high-impedance sensing circuits. |
| Consumer Power Adapter Input | Telecom Line Card Protection |
Use Scenario: Secondary-side transient suppression on 12 V or 19 V DC outputs of wall adapters exposed to ESD and capacitive coupling noise. IC Role / Device Role / Timing Role: Fast-response TVS placed after DC-DC converter output filter to protect connected devices. Use Value: Clamps 10/1000 μs surges within nanoseconds, limiting output overshoot to safe levels for USB-powered peripherals. |
Use Scenario: Protecting Ethernet PHY interfaces and PoE injectors from lightning-induced surges on twisted-pair lines. IC Role / Device Role / Timing Role: Bidirectional clamp on differential pairs (e.g., MDI-X) to maintain signal integrity during common-mode transients. Use Value: Symmetrical clamping ensures equal protection on both line polarities, preserving Ethernet signaling margins up to 100BASE-TX speeds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ85CA-M3/61 | Halogen-free variant with identical electrical specs and SMA package | Required where halogen-free compliance is mandated (e.g., EU public infrastructure projects) | Select when RoHS + halogen-free certification is mandatory; otherwise SMAJ85CA-E3/61 suffices for general commercial use |
| SMAJ85AHE3_A/H | AEC-Q101 qualified version with same VWM/VBR/VC but automotive-grade screening and traceability | Qualified for under-hood automotive ECUs requiring PPAP documentation and extended temperature validation | Choose only for automotive OEM programs; not necessary for industrial or consumer designs lacking AEC-Q101 requirement |
Compared with SMAJ85CA-M3/61 and SMAJ85AHE3_A/H, the SMAJ85CA-E3/61 offers baseline commercial-grade TVS performance with RoHS compliance and full 400 W surge capability - making it optimal for cost-sensitive, non-automotive applications where halogen-free or automotive qualification are not required.
Availability
SMAJ85CA-E3/61 is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O interface hardening, and consumer power adapter output clamping requiring stable component supply and consistent parametric performance across production lots.
Supply support for SMAJ85CA-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, efficiency, and application-specific optimization.
The SMAJ series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where fast clamping, low leakage, and repeatable surge endurance are critical.
FAQ
What is the clamping voltage of SMAJ85CA-E3/61 at its rated peak pulse current?
The SMAJ85CA-E3/61 has a maximum clamping voltage (VC) of 137 V at 2.2 A peak pulse current (IPPM), measured under the standardized 10/1000 μs waveform. This value defines the upper voltage limit imposed on protected circuitry during transient events and is confirmed in the Electrical Characteristics table on page 2 of Vishay document 88390.
Is SMAJ85CA-E3/61 suitable for automotive applications?
The SMAJ85CA-E3/61 is RoHS-compliant and rated for -55 °C to +150 °C operating junction temperature, but it is not AEC-Q101 qualified. For non-safety-critical automotive subsystems like infotainment or body electronics where qualification is not mandated, SMAJ85CA-E3/61 may be used; however, certified automotive designs require variants such as SMAJ85AHE3_A/H.
Does SMAJ85CA-E3/61 have polarity markings on the package?
No - SMAJ85CA-E3/61 is a bidirectional TVS diode and carries no cathode band or polarity marking. Both terminals are functionally identical, allowing installation without orientation concern. This contrasts with unidirectional versions (e.g., SMAJ85A), which feature a visible cathode band.
What is the thermal resistance from junction to ambient for SMAJ85CA-E3/61?
The typical thermal resistance from junction to ambient (RθJA) for SMAJ85CA-E3/61 is 120 °C/W when mounted on the minimum recommended pad layout (0.2" × 0.2" copper pads). This value assumes still air conditions and informs derating calculations for sustained power dissipation or elevated ambient temperatures.
Can SMAJ85CA-E3/61 replace SMAJ85A in an existing design?
No - SMAJ85CA-E3/61 is bidirectional while SMAJ85A is unidirectional; substituting them requires verifying circuit topology. Unidirectional types conduct forward current and block reverse voltage, whereas SMAJ85CA-E3/61 clamps equally in both directions. Using SMAJ85CA-E3/61 in place of SMAJ85A may cause unintended conduction in DC-biased lines.
SMAJ85CA-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):
- 85V
- Voltage - Breakdown (Min):
- 94.4V
- Voltage - Clamping (Max) @ Ipp:
- 137V
- Current - Peak Pulse (10/1000µs):
- 2.2A
- Power - Peak Pulse:
- 300W
- 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)
SMAJ85CA-E3/61 FAQ
1.How can I place an order for SMAJ85CA-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ85CA-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 SMAJ85CA-E3/61 reliable?
The price and inventory of SMAJ85CA-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 SMAJ85CA-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ85CA-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ85CA-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ85CA-E3/61?
SMAJ85CA-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ85CA-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 SMAJ85CA-E3/61?
For technical support, including SMAJ85CA-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ85CA-E3/61 requirements.
6.How does Aetrix verify that SMAJ85CA-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ85CA-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 SMAJ85CA-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ85CA-E3/61?
All SMAJ85CA-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ85CA-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 SMAJ85CA-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ85CA-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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