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Vishay General Semiconductor - Diodes Division SMAJ550HE3_A/H
- Part No.:
- SMAJ550HE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ550HE3_A/H.pdf
- Description:
- TVS DIODE 495VWM 760VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,707
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Product details
Overview
SMAJ550HE3_A/H from Vishay General Semiconductor is a unidirectional surface-mount TRANSZORB® transient voltage suppressor (TVS) designed for high-voltage surge protection in power and signal lines. 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 across -55 °C to +150 °C junction temperature - deployed in automotive sensor interfaces and industrial power supply input stages.
For engineers reviewing the SMAJ550HE3_A/H datasheet, SMAJ550HE3_A/H pinout, SMAJ550HE3_A/H application, or SMAJ550HE3_A/H equivalent, key selection criteria include verified unidirectional polarity, DO-214AC (SMA) package thermal resistance (RθJA = 120 °C/W), clamping performance under 10/1000 µs transients, and AEC-Q101 qualification status confirmed in Vishay Document #88391.
Technical Context
This TVS diode operates exclusively in unidirectional mode, with cathode marked by a band and anode as the unmarked end. Its clamping behavior is defined by low incremental surge resistance and a 760 V max VC at 400 mA, enabling robust suppression of inductive switching spikes and lightning-induced surges on DC bus lines.
Thermal design relies on validated RθJL = 30 °C/W (junction-to-lead) and RθJA = 120 °C/W (junction-to-ambient on minimum pad layout), while its 90 pF capacitance at 0 V and 7.5 pF at 200 V ensures minimal signal distortion in high-speed analog or power-line monitoring paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min) | 550 V - Ensures reliable conduction only above system overvoltage threshold, avoiding false triggering during normal operation. |
| VWM | 495 V - Maximum continuous reverse operating voltage compatible with 48 V–60 V DC bus systems with safety margin. |
| VC @ 400 mA | 760 V - Clamped voltage during 10/1000 µs surge limits downstream IC stress to safe levels per IEC 61000-4-5. |
| PPPM | 300 W - Peak surge power handling capability for transient events up to 10/1000 µs waveform per Fig. 1. |
| IFSM | 40 A - Non-repetitive forward surge current rating supports single-event inrush or fault-current suppression. |
| CJ @ 0 V / 200 V | 90 pF / 7.5 pF - Low dynamic capacitance minimizes loading on high-frequency signal or data lines. |
| TJ max | +150 °C - Enables use in under-hood automotive environments and enclosed industrial enclosures without derating. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, halogen-free, RoHS-compliant, MSL Level 1 (260 °C peak reflow), matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode identified by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Surge current sink | Connected to protected line; conducts transient energy to ground when VBR exceeded. |
| Anode (unbanded end) | Reference node | Typically tied to system ground or low-impedance return path to complete clamping loop. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable VBR and low leakage (<1.0 µA at VWM) over temperature and lifetime. |
| Unidirectional polarity only | Optimized for DC-biased protection circuits where reverse conduction is not required. |
| AEC-Q101 qualified | Validated for automotive applications including engine control modules and ADAS sensor power rails. |
| Low incremental surge resistance | Directly contributes to tight clamping (760 V @ 400 mA) and predictable energy dissipation. |
| UL 94 V-0 molding compound | Meets flammability requirements for safety-critical industrial and transportation equipment. |
Applications
| Automotive Power Input Protection | Industrial DC Bus Surge Suppression |
|---|---|
Use Scenario: Protecting 48 V battery-fed ECUs against load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Primary clamping device on main power rail upstream of DC-DC converters and microcontrollers. Use Value: Withstands 300 W surges and maintains <1.0 µA leakage at 495 V, preserving standby current budgets. | Use Scenario: Safeguarding PLC I/O module power inputs from inductive kickback in factory automation. IC Role / Device Role / Timing Role: Standoff protector on 24–60 V supply lines, triggered only during >550 V transients. Use Value: 760 V clamping voltage limits downstream MOSFET drain-source stress within SOA limits during 10/1000 µs events. |
| Telecom Line Interface Protection | Consumer Appliance Motor Drive Protection |
Use Scenario: Shielding Ethernet PHY power pins and auxiliary bias rails from ESD and lightning-induced surges. IC Role / Device Role / Timing Role: Secondary-level TVS on isolated DC feeds, complementing front-end common-mode chokes. Use Value: 90 pF capacitance at 0 V avoids signal integrity degradation on 100BASE-TX timing-sensitive lines. | Use Scenario: Suppressing back-EMF spikes from brushed DC motors in smart home appliances. IC Role / Device Role / Timing Role: Snubber element across motor terminals or H-bridge high-side switches. Use Value: 40 A IFSM rating handles repetitive commutation spikes without degradation over 10,000+ cycles. |
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-M3/61 | Same VBR/VWM/VC, but industrial-grade (non-AEC-Q101), M3 suffix only. | Lacks automotive qualification; suitable for commercial/industrial designs without AEC compliance mandates. | Select when AEC-Q101 is not required and cost optimization is prioritized. |
| SMCJ550A | Higher PPPM (1500 W), same VBR/VWM, larger SMC (DO-214AB) package. | Requires larger PCB footprint and higher thermal mass; used where surge energy exceeds 300 W. | Choose for higher-energy threat environments (e.g., outdoor telecom cabinets) where space allows. |
Compared with SMAJ550A-M3/61 and SMCJ550A, the SMAJ550HE3_A/H uniquely combines AEC-Q101 qualification, SMA package compactness (5.28 mm × 4.50 mm), and guaranteed 760 V clamping - making it optimal for space-constrained automotive modules requiring certified reliability.
Availability
SMAJ550HE3_A/H is available at Aetrix Electronics and suitable for automotive electronics, industrial power supplies, and telecom infrastructure requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ550HE3_A/H 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, TVS, MOSFETs, and optoelectronics with emphasis on reliability and automotive-grade validation.
The SMAJ series is engineered for high-voltage transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where precise clamping, low leakage, and AEC-Q101 compliance are mandatory.
FAQ
What is the polarity configuration of the SMAJ550HE3_A/H?
The SMAJ550HE3_A/H is unidirectional only, with cathode identified by a color band on the SMA (DO-214AC) package body. It conducts surge current from cathode to anode when reverse voltage exceeds 550 V, and blocks current below 495 V in normal operation. This polarity is fixed and cannot be used in bidirectional configurations without external circuitry.
Is the SMAJ550HE3_A/H AEC-Q101 qualified?
Yes, the SMAJ550HE3_A/H is AEC-Q101 qualified, as confirmed in Vishay Document #88391. The "HM3" base part designation and "H" package code indicate automotive-grade qualification, including stress testing for temperature cycling, humidity, and mechanical shock - essential for under-hood and ADAS applications.
What is the clamping voltage of the SMAJ550HE3_A/H under standard test conditions?
The SMAJ550HE3_A/H has a maximum clamping voltage (VC) of 760 V when subjected to a 400 mA, 10/1000 µs surge waveform, per Vishay's electrical characteristics table. This value is measured at TA = 25 °C and defines the upper voltage limit imposed on protected circuitry during transient events.
Can the SMAJ550HE3_A/H be used in AC line protection?
No - the SMAJ550HE3_A/H is unidirectional and rated for DC applications only. Its 495 V VWM is specified for continuous reverse voltage; applying AC line voltage would cause destructive conduction during negative half-cycles. For AC line protection, bidirectional TVS devices such as SMBJ550CA or dedicated MOVs are required.
What is the thermal resistance of the SMAJ550HE3_A/H in typical PCB mounting?
The SMAJ550HE3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on the minimum recommended pad layout per Vishay's datasheet. This value assumes no additional copper pour or heatsinking; adding thermal relief pads or copper planes reduces RθJA significantly in practice.
SMAJ550HE3_A/H 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/H FAQ
1.How can I place an order for SMAJ550HE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ550HE3_A/H 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/H reliable?
The price and inventory of SMAJ550HE3_A/H 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/H is usually 5 days.
3.What payment methods are accepted for SMAJ550HE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ550HE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ550HE3_A/H?
SMAJ550HE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ550HE3_A/H 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/H?
For technical support, including SMAJ550HE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ550HE3_A/H requirements.
6.How does Aetrix verify that SMAJ550HE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ550HE3_A/H 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/H meets industry standards.
7.What is the process for return or replacement of SMAJ550HE3_A/H?
All SMAJ550HE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ550HE3_A/H, 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/H part is unused and in its original packaging.
Return procedure for SMAJ550HE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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