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Vishay General Semiconductor - Diodes Division SMAJ45CA-E3/61
- Part No.:
- SMAJ45CA-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ45CA-E3/61.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:16,261
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Product details
Overview
SMAJ45CA-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 45 V standoff voltage (VWM), 50.0–55.3 V breakdown voltage (VBR) at 1 mA, and clamps to ≤72.7 V at 5.5 A peak pulse current (IPPM) under 10/1000 μs waveform - protecting MOSFETs, ICs, and sensor interfaces in automotive and industrial control systems.
For engineers reviewing the SMAJ45CA-E3/61 datasheet, SMAJ45CA-E3/61 pinout, SMAJ45CA-E3/61 application, or SMAJ45CA-E3/61 equivalent, key selection criteria include bidirectional clamping capability, 400 W peak pulse power rating (≤78 V), AEC-Q101 qualification eligibility (via HE3 suffix), low thermal resistance (RθJL = 30 °C/W), and compatibility with automated SMT assembly on standard PCB pad layouts.
Technical Context
This device operates as a voltage-clamping protector with symmetrical avalanche behavior in both directions, enabling robust surge suppression without polarity sensitivity. Its glass-passivated junction ensures stable breakdown characteristics and fast response time (<1 ps), while the SMA package supports high surge current handling (IPPM = 5.5 A) with minimal incremental surge resistance.
The SMAJ45CA-E3/61 delivers 400 W peak pulse power per 10/1000 μs waveform up to 78 V, derating linearly above that threshold to 300 W. It maintains ≤1.0 μA reverse leakage at VWM, operates across –55 °C to +150 °C junction temperature range, and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 48 V nominal systems. |
| VBR min/max | 50.0 V / 55.3 V at IT = 1 mA - Confirmed breakdown window ensures reliable turn-on during transients without premature conduction. |
| VC @ IPPM | ≤72.7 V at 5.5 A - Clamping voltage limits downstream component stress during 400 W surge events. |
| PPPM | 400 W (10/1000 μs) - Peak transient energy absorption capacity suitable for ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 3 surges. |
| IFSM | 40 A (8.3 ms half-sine) - Withstands repetitive inrush or fault currents without degradation. |
| RθJL | 30 °C/W - Low junction-to-lead thermal resistance enables effective heat dissipation through PCB copper pads. |
| TJ max | +150 °C - Supports operation in under-hood automotive and high-temperature industrial environments. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking; molded compound meets UL 94 V-0; matte tin-plated leads compliant with J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (bidirectional) | One terminal of symmetrical PN junction; accepts surge current from either direction during overvoltage events. |
| Cathode | Transient current exit (bidirectional) | Second terminal of symmetrical PN junction; completes low-impedance path to ground or return rail during clamping. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns - e.g., RS-485, CAN, or sensor differential pairs. |
| 400 W peak pulse power | Handles high-energy transients such as load dump or inductive switching spikes in 12 V/24 V automotive subsystems. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage overshoot during clamping, reducing risk of latch-up or gate oxide damage in protected MOSFETs and ICs. |
| AEC-Q101 qualification option | HE3 suffix variant available for automotive-grade reliability - validated for temperature cycling, HTRB, and ESD per AEC stress test requirements. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow profile use without baking - simplifies manufacturing for high-volume SMT lines. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 48 V battery management system (BMS) monitoring circuits from load dump transients up to ±120 V. IC Role / Device Role / Timing Role: Voltage-clamping TVS placed across supply rail input to suppress surges before they reach LDOs and ADC front-ends. Use Value: Limits transient voltage to ≤72.7 V, preventing damage to 5 V tolerant analog monitoring ICs and ensuring uninterrupted data acquisition during engine cranking. |
Use Scenario: Safeguarding RS-485 transceivers in factory automation PLC I/O modules exposed to EFT and surge noise on long cable runs. IC Role / Device Role / Timing Role: Bidirectional shunt protector on differential bus lines (A/B), referenced to local ground plane. Use Value: Maintains signal integrity by clamping common-mode surges without adding capacitance-induced timing skew - typical CJ < 100 pF at VWM. |
| Consumer Power Adapter Input Stage | Telecom DC Power Feeding Protection |
|
Use Scenario: Secondary-side overvoltage suppression in USB PD 3.0 adapters where 20 V output rails require safeguarding against feedback loop faults. IC Role / Device Role / Timing Role: Standoff-rated clamp across output capacitor terminals, triggered only during abnormal regulation failure. Use Value: Fast <1 ps response prevents >45 V excursion from reaching connected devices, satisfying IEC 62368-1 secondary circuit safety limits. |
Use Scenario: Protecting PoE-powered equipment (e.g., IP cameras) from induced surges on 48 V DC feeding lines in outdoor telecom cabinets. IC Role / Device Role / Timing Role: Bidirectional TVS installed between PSE output pair and PD input bridge rectifier input. Use Value: Absorbs 400 W surges per IEEE 802.3bt Annex 132A test profiles while maintaining <1.0 μA leakage to avoid standby power penalty. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ45CA-M3/61 | Halogen-free, RoHS-compliant variant with identical electrical specs and SMA package. | No functional difference; selected when halogen-free compliance is mandated by OEM environmental policy. | Direct material substitution where halogen content restrictions apply; same layout and thermal performance. |
| SMAJ43CA-E3/61 | Lower VWM (43 V), VBR (47.8–52.8 V), and VC (69.4 V at 5.8 A); otherwise identical construction and rating. | Better suited for tighter-margin 42 V nominal systems; slightly higher leakage (≤5.8 μA vs. ≤1.0 μA at VWM). | Choose when system operating voltage tolerances require lower clamping onset - verify VBR margin against worst-case transients. |
Compared with SMAJ45CA-E3/61, SMAJ45CA-M3/61 offers identical protection performance with halogen-free materials, while SMAJ43CA-E3/61 provides earlier clamping onset at the cost of reduced VWM margin - making it preferable only in 42 V systems where tighter voltage control is critical.
Availability
SMAJ45CA-E3/61 is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, consumer power adapters, and telecom DC feeding systems requiring stable component supply, consistent RoHS compliance, and full traceability.
Supply support for SMAJ45CA-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, power efficiency, and automotive-grade qualification.
The SMAJ series is engineered for high-reliability transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where robustness against ESD, EFT, and surge events is mission-critical.
FAQ
What is the maximum clamping voltage of the SMAJ45CA-E3/61 under standard test conditions?
The SMAJ45CA-E3/61 clamps to a maximum of 72.7 V when subjected to its rated peak pulse current of 5.5 A using the 10/1000 μs waveform. This value is measured at TA = 25 °C with devices mounted on 0.2" × 0.2" copper pads per terminal, and represents the upper limit of voltage seen by protected circuitry during surge events.
Is the SMAJ45CA-E3/61 suitable for automotive applications?
Yes - the SMAJ45CA-E3/61 is eligible for automotive use via the AEC-Q101 qualified HE3 suffix variant (e.g., SMAJ45CAHE3_A). While the base SMAJ45CA-E3/61 is commercial grade, its construction - including glass-passivated junction, MSL Level 1 rating, and –55 °C to +150 °C operating range - aligns with foundational automotive reliability requirements.
How does the bidirectional design of the SMAJ45CA-E3/61 affect its placement on the PCB?
The SMAJ45CA-E3/61 has no polarity marking and functions identically in both directions, so it can be placed without orientation constraints. This simplifies layout and assembly for AC-coupled or floating nodes - such as differential communication lines or transformer-isolated power inputs - eliminating risk of reverse installation during SMT placement.
What is the thermal resistance from junction to ambient for the SMAJ45CA-E3/61?
The typical junction-to-ambient thermal resistance (RθJA) of the SMAJ45CA-E3/61 is 120 °C/W under standard test conditions (mounted on 0.2" × 0.2" copper pads). For thermal design, engineers should prioritize minimizing RθJA via larger copper areas or internal ground planes, as RθJL = 30 °C/W indicates superior lead-to-board conduction.
Does the SMAJ45CA-E3/61 meet any international safety or flammability standards?
Yes - the SMAJ45CA-E3/61's molding compound meets UL 94 V-0 flammability rating, and the device carries Underwriters Laboratory Recognition (QVGQ2) under UL 497B for protector classification, with file number E136766. These certifications validate its suitability for safety-critical surge protection in end-equipment requiring regulatory compliance.
SMAJ45CA-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):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 72.7V
- Current - Peak Pulse (10/1000µs):
- 5.5A
- Power - Peak Pulse:
- 400W
- 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)
SMAJ45CA-E3/61 FAQ
1.How can I place an order for SMAJ45CA-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ45CA-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 SMAJ45CA-E3/61 reliable?
The price and inventory of SMAJ45CA-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 SMAJ45CA-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ45CA-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ45CA-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ45CA-E3/61?
SMAJ45CA-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ45CA-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 SMAJ45CA-E3/61?
For technical support, including SMAJ45CA-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ45CA-E3/61 requirements.
6.How does Aetrix verify that SMAJ45CA-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ45CA-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 SMAJ45CA-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ45CA-E3/61?
All SMAJ45CA-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ45CA-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 SMAJ45CA-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ45CA-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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