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Vishay General Semiconductor - Diodes Division SMAJ550-E3/61
- Part No.:
- SMAJ550-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ550-E3/61.pdf
- Description:
- TVS DIODE 495VWM 760VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,061
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Product details
Overview
SMAJ550-E3/61 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, rated for 550 V breakdown voltage (VBR), 495 V working voltage (VWM), 760 V clamping voltage at 400 mA, 300 W peak pulse power (10/1000 µs), and 150 °C max junction temperature - deployed to protect MOSFETs and sensor signal lines in automotive power electronics.
For engineers reviewing the SMAJ550-E3/61 datasheet, SMAJ550-E3/61 pinout, SMAJ550-E3/61 application, or SMAJ550-E3/61 equivalent, key selection criteria include verified unidirectional polarity, clamping performance under 400 mA surge, thermal resistance (RθJA = 120 °C/W), 90 pF capacitance at 0 V, and AEC-Q101 qualification eligibility via HM3 suffix variants.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: it remains high-impedance below VWM = 495 V, avalanches at VBR = 550 V (min, 100 µA test current), and limits transient voltages to ≤760 V during 10/1000 µs surges up to 300 W. Its glass-passivated junction ensures stable breakdown and low leakage (ID ≤ 1.0 µA at VWM).
Thermal design relies on RθJL = 30 °C/W (junction-to-lead) and RθJA = 120 °C/W (junction-to-ambient, on minimum pad layout); clamping voltage increases with temperature due to +650 mV/°C VBR coefficient, requiring PCB copper area optimization per Vishay's thermal resistance guidelines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min) | 550 V - guaranteed avalanche initiation voltage at 100 µA, defining minimum overvoltage threshold before conduction |
| VWM | 495 V - maximum continuous reverse operating voltage without significant leakage or degradation |
| VC @ 400 mA | 760 V - peak clamped voltage during standardized 10/1000 µs surge, directly limiting stress on downstream ICs |
| PPPM | 300 W - non-repetitive surge power handling capability, derated above 25 °C per published curve |
| CJ @ 0 V | 90 pF - junction capacitance affecting high-frequency signal integrity on protected lines (e.g., CAN, LIN) |
| TJ max | +150 °C - absolute maximum junction temperature, constraining sustained power dissipation and PCB thermal design |
| IFSM | 40 A - non-repetitive forward surge current rating, relevant for fault conditions involving polarity reversal |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, halogen-free, RoHS-compliant, MSL Level 1 (260 °C peak reflow). Cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during reverse-biased clamping | Connected to protected line (e.g., battery rail or signal trace); conducts surge current to ground when V > VBR |
| Cathode | Current exit point during clamping; marked with band | Connected to system ground or low-impedance return path; defines unidirectional conduction direction |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under repeated surge stress without parameter drift |
| Low incremental surge resistance | Enables tighter clamping (760 V @ 400 mA) versus competing TVS devices, reducing voltage overshoot on protected nodes |
| Fast response time (<1 ps) | Activates before sensitive downstream components (e.g., gate oxides of 40 V MOSFETs) experience destructive overvoltage |
| AEC-Q101 qualification path | Available in HM3 suffix variant (e.g., SMAJ550HM3_B/H), enabling use in automotive powertrain and body electronics |
| UL 94 V-0 molding compound | Meets flammability safety requirements for enclosed industrial and automotive enclosures |
Applications
| Automotive Power Distribution | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V battery-fed control modules against load-dump transients (ISO 7637-2 Pulse 5a) and inductive switching spikes. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between battery rail and ground, clamping surges before they reach MCU power inputs or driver ICs. Use Value: Limits peak voltage to ≤760 V while dissipating 300 W pulses, preventing latch-up or permanent damage to 3.3 V/5 V logic supplies. | Use Scenario: Safeguarding analog and digital signal lines (e.g., thermistor, pressure sensor outputs) in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: Low-capacitance (90 pF) TVS mounted directly at connector entry, suppressing ESD (IEC 61000-4-2) and fast transients (IEC 61000-4-4). Use Value: Maintains signal fidelity with minimal loading (<90 pF), while surviving ±30 kV contact ESD events without degradation. |
| Telecom DC Power Input | Consumer Appliance Motor Drive |
Use Scenario: Securing 48 V DC input stages of PoE-powered network switches and base station radios against lightning-induced surges. IC Role / Device Role / Timing Role: Primary-level TVS on main DC bus, coordinated with upstream fuses and secondary-stage TVS arrays. Use Value: Withstands 300 W 10/1000 µs surges and operates reliably from −55 °C to +150 °C, meeting extended telecom environmental specs. | Use Scenario: Shielding microcontroller GPIOs and gate drivers in smart home appliances (e.g., washing machine motor controllers) from commutation noise. IC Role / Device Role / Timing Role: Localized TVS on motor phase traces and feedback lines, placed adjacent to connectors and ICs. Use Value: Fast <1 ps response prevents false triggering of overvoltage protection circuits and preserves timing-critical PWM signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ530-E3/61 | Lower VBR (530 V min) and VWM (477 V), same package and PPPM | Better suited for 48 V systems where lower clamping headroom is acceptable | Select when system nominal voltage is ≤48 V and tighter VWM/VBR margin is required |
| SMBJ550A-E3/52 | Same VBR/VWM, but SMB (DO-214AA) package - larger footprint, lower RθJA (90 °C/W) | Higher thermal mass supports higher average surge duty cycles in industrial motor drives | Choose when board space allows and improved thermal performance justifies larger package |
Compared with SMAJ550-E3/61, SMAJ530-E3/61 offers lower standoff voltage for tighter 48 V system margins, while SMBJ550A-E3/52 provides superior thermal dissipation in space-tolerant designs - neither is pin-compatible, but both serve overlapping transient suppression roles with distinct voltage and thermal trade-offs.
Availability
SMAJ550-E3/61 is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface protection, telecom DC input stages, and consumer appliance motor drive designs requiring stable component supply and consistent surge performance.
Supply support for SMAJ550-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 specifically for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where high-voltage surges, thermal cycling, and long service life are critical design constraints.
FAQ
What is the minimum breakdown voltage specification for SMAJ550-E3/61?
The SMAJ550-E3/61 has a minimum breakdown voltage (VBR) of 550 V at 100 µA test current, as specified in the Vishay datasheet (Document Number: 88391). This value is guaranteed across temperature and lifetime, and defines the lowest voltage at which the device enters avalanche conduction. It is not a typical or average value - all units meet or exceed 550 V.
Is SMAJ550-E3/61 suitable for automotive applications?
SMAJ550-E3/61 itself is industrial-grade; however, the AEC-Q101 qualified version is designated SMAJ550HM3_B/H (or similar HM3 suffix). The SMAJ550-E3/61 shares identical electrical characteristics and package, but lacks the extended reliability testing required for automotive use. For automotive designs, specify the HM3 variant to ensure qualification compliance.
What is the clamping voltage of SMAJ550-E3/61 under standard surge conditions?
The SMAJ550-E3/61 clamps to a maximum of 760 V when subjected to a 400 mA, 10/1000 µs double-exponential surge waveform. This value is measured per IEC 61000-4-5 methodology and represents worst-case voltage seen by downstream circuitry during transient events - critical for verifying safe operating margins of protected ICs.
Does SMAJ550-E3/61 have bidirectional capability?
No, SMAJ550-E3/61 is unidirectional only, as confirmed in the Vishay datasheet features section. It conducts surge current only when cathode is more positive than anode. For bidirectional protection (e.g., AC lines or differential data buses), separate devices such as P6SMB55CA or SMAJ55CA must be selected - SMAJ550-E3/61 cannot be used in reverse-biased configurations without risk of failure.
What is the thermal resistance of SMAJ550-E3/61 in standard mounting?
Per the Vishay datasheet, SMAJ550-E3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on the minimum recommended pad layout (0.2" × 0.2" copper pads). Its junction-to-lead resistance (RθJL) is 30 °C/W, indicating efficient heat transfer to PCB copper - essential for sustaining multiple surge events without exceeding TJ = 150 °C.
SMAJ550-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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 495V
- Voltage - Breakdown (Min):
- 550V
- Voltage - Clamping (Max) @ Ipp:
- 760V
- Current - Peak Pulse (10/1000µs):
- 400mA
- Power - Peak Pulse:
- 300W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 90pF @ 1MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ550-E3/61 FAQ
1.How can I place an order for SMAJ550-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ550-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 SMAJ550-E3/61 reliable?
The price and inventory of SMAJ550-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 SMAJ550-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ550-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ550-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ550-E3/61?
SMAJ550-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ550-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 SMAJ550-E3/61?
For technical support, including SMAJ550-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ550-E3/61 requirements.
6.How does Aetrix verify that SMAJ550-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ550-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 SMAJ550-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ550-E3/61?
All SMAJ550-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ550-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 SMAJ550-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ550-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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