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Vishay General Semiconductor - Diodes Division SMAJ550HE3_A/I
- Part No.:
- SMAJ550HE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ550HE3_A/I.pdf
- Description:
- TVS DIODE 495VWM 760VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,016
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Product details
Overview
SMAJ550HE3_A/I from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for high-voltage transient protection of sensitive electronics. It features a 550 V minimum breakdown voltage (VBR), 495 V maximum working voltage (VWM), 760 V clamping voltage at 400 mA, 300 W peak pulse power (10/1000 µs), and operates from –55 °C to +150 °C - used in automotive powertrain control units against load-dump surges.
For engineers reviewing the SMAJ550HE3_A/I datasheet, SMAJ550HE3_A/I pinout, SMAJ550HE3_A/I application, or SMAJ550HE3_A/I equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification status, thermal resistance (RθJA = 120 °C/W), clamping performance under 10/1000 µs transients, and compatibility with standard SMA PCB footprints.
Technical Context
This TVS diode employs a glass-passivated silicon junction optimized for fast response (<1 ps) and low incremental surge resistance. Its unidirectional configuration provides reverse-biased clamping only, with cathode marked by a band - requiring correct orientation in series with protected signal or power lines.
The device meets MSL Level 1 per J-STD-020 and supports lead-free soldering (260 °C peak). Its 760 V clamping voltage at 400 mA ensures robust overvoltage suppression while maintaining <1.0 µA leakage at 495 V, enabling reliable operation in high-impedance sensor interfaces and automotive CAN-FD power rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR min | 550 V - guarantees reliable triggering above system nominal voltage; prevents false clamping during normal operation |
| VWM | 495 V - maximum continuous reverse operating voltage; sets upper limit for DC bias before leakage rises |
| VC @ 400 mA | 760 V - clamped voltage under standardized 10/1000 µs surge; defines worst-case stress on downstream ICs |
| PPPM | 300 W - peak pulse power handling capability; determines survivability against ISO 7637-2 Pulse 5a load-dump events |
| IFSM | 40 A - non-repetitive forward surge current rating; validates single-event robustness without bond-wire fusing |
| TJ max | +150 °C - maximum junction temperature; enables placement near hot components like power MOSFETs or gate drivers |
| CJ @ 0 V | 90 pF - junction capacitance at zero bias; impacts high-frequency signal integrity in data lines up to ~100 MHz |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads. Cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward conduction mode | Connected to ground or low-impedance return path; must be routed with low-inductance trace for effective surge shunting |
| Cathode | Current exit terminal in forward conduction mode; marked with band | Connected to protected line (e.g., 48 V battery rail); polarity reversal causes open-circuit failure mode |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enables stable VBR over temperature and lifetime; eliminates moisture-induced parameter drift in humid environments |
| AEC-Q101 qualified | Validated for automotive under-hood applications including engine control modules and ADAS power supplies |
| MSL Level 1 rating | Allows unlimited floor life and reflow at 260 °C without preconditioning - simplifies SMT manufacturing flow |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes overvoltage margin between trigger and clamp; reduces required voltage headroom in protected circuits |
| 90 pF junction capacitance | Permits use on medium-speed digital lines (e.g., LIN bus, SENT sensors) without signal distortion or timing skew |
Applications
| Automotive Powertrain Control | Industrial 48 V DC Distribution |
|---|---|
Use Scenario: Protection of microcontroller I/O and CAN transceiver power pins against ISO 7637-2 Pulse 5a (load dump) in engine ECUs. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 48 V supply rail and ground, triggered within picoseconds to clamp transients below 800 V. Use Value: Prevents latch-up or permanent damage to 5 V LDO regulators and 3.3 V MCU cores during 120 V/100 ms surges. | Use Scenario: Safeguarding programmable logic controllers (PLCs) receiving 48 V auxiliary power in factory automation cabinets. IC Role / Device Role / Timing Role: Standoff protector on input stage, absorbing repetitive switching transients from solenoid drivers and relay coils. Use Value: Maintains system uptime by eliminating field failures caused by cumulative degradation of unprotected DC-DC converter inputs. |
| Telecom Base Station DC Feeds | Renewable Energy Inverter DC Link |
Use Scenario: Shielding remote radio unit (RRU) power inputs from lightning-induced surges on outdoor 48 V telecom feeds. IC Role / Device Role / Timing Role: First-line transient suppressor upstream of bulk capacitors and active OR-ing FETs. Use Value: Reduces need for secondary MOV-based protection stages, lowering BOM cost and board space by 35%. | Use Scenario: Protecting IGBT gate driver supplies in solar string inverters exposed to grid-switching transients and PV array arcing events. IC Role / Device Role / Timing Role: Fast-clamping element across isolated 15 V gate supply, limiting voltage overshoot during Miller plateau transitions. Use Value: Extends gate oxide lifetime by limiting VGS spikes to <800 V, preventing premature IGBT failure in 10-year field deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ550A-M3/5A | Same VBR, VWM, VC, and package; differs only in tape-and-reel packaging (7500 pcs vs. 1800 pcs) and absence of AEC-Q101 qualification | Not rated for automotive under-hood use; suitable for industrial/commercial designs where qualification is not mandated | Select when AEC-Q101 is unnecessary and higher volume reels reduce assembly cost |
| 1.5SMC56A | Higher VBR (56 V nominal), lower VC (93.6 V), same PPPM; larger SMC (DO-214AB) package with higher RθJA (60 °C/W) | Designed for 48 V systems with tighter clamping margins; requires larger PCB area and different thermal layout | Choose for lower clamping voltage in space-tolerant 48 V applications, but verify pad thermal relief matches SMC footprint |
Compared with SMAJ550HE3_A/I, SMAJ550A-M3/5A offers identical electrical performance without automotive qualification, while 1.5SMC56A delivers lower clamping at lower voltage but demands more board area and revised thermal design - making SMAJ550HE3_A/I optimal for AEC-Q101–required 48–60 V systems with strict size constraints.
Availability
SMAJ550HE3_A/I is available at Aetrix Electronics and suitable for automotive powertrain control, industrial 48 V DC distribution, and telecom base station DC feed applications requiring stable component supply, long-term lifecycle support, and AEC-Q101 compliance.
Supply support for SMAJ550HE3_A/I 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, thermal performance, and automotive-grade validation.
The SMAJ series targets high-voltage transient suppression in harsh environments, engineered specifically for load-dump and inductive-switching surge immunity in automotive, industrial, and telecom infrastructure.
FAQ
What is the AEC-Q101 qualification status of SMAJ550HE3_A/I?
SMAJ550HE3_A/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation in datasheet 88391. This qualification covers temperature cycling, humidity bias, mechanical shock, and ESD testing per automotive requirements - ensuring suitability for under-hood ECU and ADAS power supply protection. The "H" in HM3 explicitly denotes AEC-Q101 compliance, and the "A/I" suffix indicates tape-and-reel packaging with 13-inch reel format.
Does SMAJ550HE3_A/I support lead-free reflow soldering?
Yes, SMAJ550HE3_A/I supports lead-free reflow soldering with a maximum peak temperature of 260 °C, meeting J-STD-020 MSL Level 1 requirements. Its matte tin-plated leads are solderable per J-STD-002 and JESD 22-B102, and it passes JESD 201 Class 2 whisker testing. No preconditioning is needed prior to reflow, enabling direct integration into standard SMT lines without process modification.
What is the clamping voltage of SMAJ550HE3_A/I under standard test conditions?
The clamping voltage (VC) of SMAJ550HE3_A/I is 760 V when subjected to a 400 mA, 10/1000 µs waveform - per datasheet 88391, Table on page 2. This value represents the maximum voltage measured across the device during surge conduction and defines the upper voltage stress imposed on downstream circuitry. It is measured with the device mounted on 0.2" × 0.2" copper pads per JEDEC standards.
Can SMAJ550HE3_A/I be used in bidirectional configurations?
No, SMAJ550HE3_A/I is unidirectional only, as stated in the Features section of datasheet 88391. It conducts and clamps only when the cathode is biased positively relative to the anode. For bidirectional protection, two SMAJ550HE3_A/I devices must be connected in series opposition, or a dedicated bidirectional part such as SMBJ550A should be selected - which has symmetrical VBR and VC ratings for both polarities.
What is the thermal resistance from junction to ambient for SMAJ550HE3_A/I?
The typical thermal resistance from junction to ambient (RθJA) for SMAJ550HE3_A/I is 120 °C/W, measured on the minimum recommended pad layout per datasheet 88391. This value assumes standard SMA mounting on FR-4 with 0.2" × 0.2" copper pads per terminal. Effective heat dissipation requires adherence to Vishay's recommended PCB layout to avoid exceeding TJ max of +150 °C during repetitive surge events.
SMAJ550HE3_A/I 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:
- -
- Capacitance @ Frequency:
- 90pF @ 1MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ550HE3_A/I FAQ
1.How can I place an order for SMAJ550HE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ550HE3_A/I 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 SMAJ550HE3_A/I reliable?
The price and inventory of SMAJ550HE3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ550HE3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ550HE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ550HE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ550HE3_A/I?
SMAJ550HE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ550HE3_A/I 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 SMAJ550HE3_A/I?
For technical support, including SMAJ550HE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ550HE3_A/I requirements.
6.How does Aetrix verify that SMAJ550HE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ550HE3_A/I 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 SMAJ550HE3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ550HE3_A/I?
All SMAJ550HE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ550HE3_A/I, 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 SMAJ550HE3_A/I part is unused and in its original packaging.
Return procedure for SMAJ550HE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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