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Vishay General Semiconductor - Diodes Division SMAJ85A-E3/61
- Part No.:
- SMAJ85A-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ85A-E3/61.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:1,553
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Product details
Overview
SMAJ85A-E3/61 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for primary overvoltage protection of DC power rails and signal lines. It features a 85 V standoff voltage (VWM), 94.4–104 V breakdown range at 1 mA, clamps transients to ≤137 V at 2.2 A peak pulse current (IPPM), and delivers 400 W peak pulse power (10/1000 μs waveform) - ideal for safeguarding MOSFET gates and microcontroller I/O in industrial motor drives.
For engineers reviewing the SMAJ85A-E3/61 datasheet, SMAJ85A-E3/61 pinout, SMAJ85A-E3/61 application, or SMAJ85A-E3/61 equivalent, this device is evaluated for fast transient suppression in 24–48 V DC systems, reverse polarity protection, and ESD robustness per IEC 61000-4-2 Level 4, with explicit thermal derating guidance above 25 °C ambient.
Technical Context
This unidirectional TVS operates as a clamping device: under normal bias it presents <1.0 μA leakage at 85 V, then rapidly avalanches when voltage exceeds its 94.4–104 V breakdown threshold to limit surge energy. Its glass-passivated junction ensures stable VBR tolerance and low incremental surge resistance (Rdyn ≈ 15.5 Ω derived from ΔVC/ΔIPPM).
Mounted on 5.0 mm × 5.0 mm copper pads, it achieves 120 °C/W junction-to-ambient thermal resistance and supports repetitive surges at 0.01% duty cycle. Polarity is marked by a cathode band; no marking applies to bidirectional variants - confirming SMAJ85A-E3/61's unidirectional configuration per device marking "RV" and suffix "A".
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - maximum continuous reverse operating voltage before clamping begins; sets upper limit for protected circuit DC rail |
| VBR (min/max) | 94.4 V / 104 V at 1 mA - guaranteed avalanche onset window; determines minimum overvoltage margin before conduction |
| VC @ IPPM | 137 V at 2.2 A - clamped voltage during 10/1000 μs surge; defines worst-case stress on downstream ICs |
| PPPM | 400 W - peak pulse power handling (10/1000 μs); enables protection against IEC 61000-4-5 Level 3 surges (1 kV/2 Ω) |
| IFSM | 40 A - 8.3 ms half-sine surge rating; supports single-event reverse polarity fault recovery without failure |
| TJ max | +150 °C - maximum junction temperature; allows operation in enclosed industrial enclosures up to +85 °C ambient with derating |
| RθJA | 120 °C/W - thermal resistance to ambient on standard 0.2" × 0.2" pads; informs heatsinking requirements for high-duty-cycle use |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile plastic case with matte tin-plated leads compliant with J-STD-002 and JESD 22-B102. Cathode identified by a single black band on the body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Current entry terminal during forward conduction | Connected to system ground or lower-potential node; enables reverse-biased clamping when cathode is at higher potential |
| Cathode (banded end) | Current exit terminal during avalanche conduction | Connected to protected line (e.g., 48 V rail); conducts surge current to ground when Vin > VC |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Supports IEC 61000-4-5 surge immunity testing up to 1 kV open-circuit voltage with 2 Ω source impedance |
| Low clamping ratio (VC/VBR ≈ 1.36) | Minimizes voltage overshoot during transients - critical for protecting 100 V-rated MOSFETs and logic-level interfaces |
| MSL Level 1 (260 °C reflow) | Enables single-pass lead-free soldering without moisture sensitivity concerns or baking requirements |
| RoHS-compliant, halogen-free option available (E3 suffix) | Meets EU RoHS Directive 2011/65/EU and JEDEC J-STD-20 MSL criteria for commercial-grade applications |
| Fast response time (<1 ps) | Clamps ESD events (IEC 61000-4-2) before damage occurs to sensitive CMOS inputs or gate oxides |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of 48 V DC bus against inductive kickback from solenoid valves and relay coils. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between rail and chassis ground to shunt transient energy. Use Value: Limits voltage spikes to ≤137 V, preventing gate oxide rupture in 100 V MOSFETs and ensuring ASIL-B functional safety compliance. |
Use Scenario: Reverse polarity protection on LIN bus power input in door module ECUs. IC Role / Device Role / Timing Role: Series-connected unidirectional TVS absorbing reverse-voltage faults up to –40 V. Use Value: Withstands 40 A surge for 8.3 ms, enabling safe recovery after battery misconnection without fuse blow. |
| Telecom Power Supplies | Consumer Appliance Control Boards |
Use Scenario: Secondary-side overvoltage clamp on 24 V auxiliary supply feeding FPGA configuration circuitry. IC Role / Device Role / Timing Role: Standoff-rated TVS across output capacitor to suppress switching noise and lightning-induced surges. Use Value: 85 V VWM avoids leakage during normal 24 V operation while clamping 1 kV surges to safe levels for 3.3 V logic rails. |
Use Scenario: Input protection for microcontroller ADC pins monitoring thermistor-based temperature sensing. IC Role / Device Role / Timing Role: Low-capacitance TVS (CJ ≈ 100 pF at 0 V) placed directly at connector interface. Use Value: Sub-1 ns response preserves signal integrity of slow analog signals while blocking ±8 kV contact ESD per IEC 61000-4-2. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ85CA-E3/61 | Bidirectional variant with same VWM (85 V), symmetric clamping in both polarities; VBR min/max identical but dual-directional | Required where AC-coupled or floating signal lines need protection against both positive and negative transients | Select SMAJ85CA-E3/61 only if bidirectional clamping is needed; SMAJ85A-E3/61 is optimal for DC rail protection with defined polarity |
| SMBJ85A-E3/52 | Same electrical specs but in larger SMB (DO-214AA) package; 100 W higher PPPM (500 W), lower RθJA (90 °C/W), 2× PCB footprint | Suitable for higher-reliability industrial designs requiring extended surge endurance or improved thermal margin | Choose SMBJ85A-E3/52 when 500 W surge rating or lower thermal resistance is mandatory; SMAJ85A-E3/61 fits space-constrained layouts |
Compared with SMAJ85CA-E3/61 and SMBJ85A-E3/52, SMAJ85A-E3/61 provides optimal balance of 400 W surge capability, compact SMA footprint, and unidirectional DC rail protection - making it preferred for cost-sensitive, space-limited 48 V systems where polarity is fixed.
Availability
SMAJ85A-E3/61 is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power supplies requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ85A-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 qualification for harsh environments.
The SMAJ series was engineered specifically for surface-mount transient suppression in industrial, automotive, and telecom infrastructure - delivering high-power clamping in ultra-compact packages with AEC-Q101 qualification options.
FAQ
What is the clamping voltage of SMAJ85A-E3/61 at its rated peak pulse current?
The SMAJ85A-E3/61 clamps to a maximum of 137 V at its specified peak pulse current of 2.2 A (10/1000 μs waveform). This value is measured under standardized test conditions and represents the worst-case voltage seen by downstream components during a surge event. The clamping voltage is confirmed in the Electrical Characteristics table on page 2 of Vishay document 88390, revision 09-Jan-2024.
Is SMAJ85A-E3/61 RoHS-compliant and lead-free compatible?
Yes, SMAJ85A-E3/61 is RoHS-compliant and qualified for lead-free reflow soldering per J-STD-020 MSL Level 1, with a maximum peak temperature of 260 °C. The "E3" suffix explicitly denotes RoHS-compliant, commercial-grade construction with matte tin-plated leads meeting J-STD-002 solderability standards. This is documented in the Mechanical Data section of the Vishay datasheet.
How does SMAJ85A-E3/61 differ from SMAJ85CA-E3/61?
SMAJ85A-E3/61 is unidirectional, with a cathode band and asymmetric conduction (avalanche only in reverse bias), whereas SMAJ85CA-E3/61 is bidirectional and functions identically in both polarities. Both share identical VWM (85 V), VBR, and VC, but SMAJ85A-E3/61 is intended for DC rail protection with known polarity, while SMAJ85CA-E3/61 suits AC or floating signal lines.
What is the maximum operating temperature for SMAJ85A-E3/61?
The SMAJ85A-E3/61 has a maximum junction temperature (TJ) of +150 °C and an operating ambient range of –55 °C to +150 °C. Its thermal resistance (RθJA) is 120 °C/W on standard 0.2" × 0.2" copper pads, meaning power dissipation must be derated above 25 °C ambient per Figure 2 in the Vishay datasheet to maintain TJ ≤ 150 °C.
Can SMAJ85A-E3/61 be used for reverse polarity protection?
Yes, SMAJ85A-E3/61 can provide reverse polarity protection when placed in series with the power input - conducting only during reverse-voltage faults and limiting current via its 40 A IFSM rating (8.3 ms half-sine). However, it is not a dedicated reverse polarity controller; for sustained reverse blocking, pairing with a series MOSFET is recommended. Its 85 V VWM supports protection in 24–48 V systems.
SMAJ85A-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:
- 1
- Bidirectional Channels:
- -
- 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)
SMAJ85A-E3/61 FAQ
1.How can I place an order for SMAJ85A-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ85A-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 SMAJ85A-E3/61 reliable?
The price and inventory of SMAJ85A-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 SMAJ85A-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ85A-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ85A-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ85A-E3/61?
SMAJ85A-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ85A-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 SMAJ85A-E3/61?
For technical support, including SMAJ85A-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ85A-E3/61 requirements.
6.How does Aetrix verify that SMAJ85A-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ85A-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 SMAJ85A-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ85A-E3/61?
All SMAJ85A-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ85A-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 SMAJ85A-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ85A-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ85A-E3/61 Tags
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