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Vishay General Semiconductor - Diodes Division SMAJ45CA-M3/5A
- Part No.:
- SMAJ45CA-M3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ45CA-M3/5A.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,519
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Product details
Overview
SMAJ45CA-M3/5A from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection on signal and power lines. It features a 45 V standoff voltage (VWM), 50.0–55.3 V breakdown voltage (VBR) at 1 mA, 72.7 V maximum clamping voltage (VC) at 5.5 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - deployed in automotive sensor interfaces, industrial I/O protection, and telecom line conditioning.
For engineers reviewing the SMAJ45CA-M3/5A datasheet, SMAJ45CA-M3/5A pinout, SMAJ45CA-M3/5A application, or SMAJ45CA-M3/5A equivalent, key selection criteria include bidirectional clamping symmetry, low thermal resistance (RθJA = 120 °C/W), halogen-free RoHS compliance (M3 suffix), AEC-Q101 qualification eligibility, and DO-214AC (SMA) package compatibility with automated SMT assembly.
Technical Context
This bidirectional TVS operates symmetrically in both polarities, delivering identical clamping behavior above ±45 V standoff. Its glass-passivated junction ensures stable VBR tolerance (±5 %) and fast response time (<1 ps), while the low incremental surge resistance minimizes voltage overshoot during transient events such as ESD (IEC 61000-4-2), EFT (IEC 61000-4-4), and lightning-induced surges (IEC 61000-4-5).
The device is rated for repetitive 400 W pulses (duty cycle 0.01 %) up to TA = 25 °C, derating linearly above that temperature per Fig. 2. With a maximum junction temperature of +150 °C and MSL Level 1 moisture sensitivity, it supports lead-free reflow profiles peaking at 260 °C and is qualified for automotive-grade reliability when ordered with HE3/HM3 suffixes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse working voltage before clamping begins; defines safe operating margin below breakdown. |
| VBR (min/max) | 50.0 V / 55.3 V at 1 mA - Confirmed bidirectional breakdown range; ensures consistent turn-on across polarity and unit-to-unit variation. |
| VC @ IPPM | 72.7 V at 5.5 A - Clamped voltage under 10/1000 μs surge; determines protected circuit's maximum transient exposure level. |
| PPPM | 400 W - Peak pulse power handling (10/1000 μs); enables protection against high-energy transients without failure. |
| IPPM | 5.5 A - Peak pulse current corresponding to VC; used to size PCB trace width and verify system-level surge margin. |
| TJ max. | +150 °C - Maximum junction temperature; sets thermal design limits for ambient and power dissipation in sealed enclosures. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads; informs heatsinking requirements for sustained surge duty. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads. Bidirectional construction has no polarity marking; terminals are symmetrical anode/cathode pairs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional transient conduction path | Either terminal serves as anode or cathode depending on instantaneous polarity; enables clamp-on-both-sides protection without orientation constraints. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Supports high-energy surge immunity in industrial and automotive environments without derating below 78 V. |
| Low clamping ratio (VC/VWM ≈ 1.62) | Minimizes overvoltage stress on downstream ICs like CAN transceivers or ADC front-ends during transient events. |
| MSL Level 1, 260 °C reflow compatible | Enables single-pass lead-free assembly without pre-baking or special handling in high-volume SMT lines. |
| Halogen-free, RoHS-compliant (M3 suffix) | Fulfills environmental compliance for global OEM programs including automotive Tier-1 supply chains. |
| ±5 % VBR tolerance | Ensures predictable clamping onset across production lots, critical for tight-margin analog and sensor signal paths. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting LIN/CAN bus nodes and temperature/pressure sensors from load dump and ISO 7637-2 pulses in engine control modules. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector entry point to shunt transients before reaching MCU or transceiver. Use Value: Maintains signal integrity under 100 V/50 ms load dump events while limiting clamped voltage to ≤72.7 V, preserving sensor accuracy and MCU I/O safety. |
Use Scenario: Safeguarding 24 V DC digital input channels in programmable logic controllers exposed to relay coil flyback and field wiring surges. IC Role / Device Role / Timing Role: Parallel-connected TVS on each input line to absorb inductive switching energy before it reaches optocoupler or Schmitt trigger inputs. Use Value: Enables reliable operation in harsh factory environments with >100,000 surge cycles, validated per IEC 61000-4-4 Level 4 (4 kV EFT). |
| Telecom Line Interface | Consumer Power Adapter ESD Protection |
Use Scenario: Shielding RS-485 transceivers and Ethernet PHYs from lightning-induced surges on outdoor data lines. IC Role / Device Role / Timing Role: First-stage protection device upstream of GDT or polymer PTC, absorbing initial fast-rising edge of 10/700 μs telecom surges. Use Value: Clamps sub-100 ns transients to <73 V within 1 ps, preventing latch-up or gate oxide damage in high-speed interface ICs. |
Use Scenario: Secondary-side overvoltage suppression on 5–20 V DC output rails of USB-C PD adapters and wireless charging bases. IC Role / Device Role / Timing Role: Final-clamp component after primary regulation, guarding against output short-circuit recovery spikes and hot-plug transients. Use Value: Survives repeated 8 kV contact ESD events (IEC 61000-4-2) without parameter shift, ensuring long-term reliability in consumer end-products. |
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-E3/5A | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs. M3). | Acceptable for commercial/industrial use where halogen-free requirement is not mandated. | Select E3 for cost-sensitive non-automotive designs with standard RoHS compliance. |
| SMAJ45CAHM3_A/I | Identical specs plus AEC-Q101 qualification; HM3 denotes halogen-free + automotive grade. | Required for automotive ECUs, ADAS sensors, and any application requiring automotive reliability validation. | Choose HM3_A/I when automotive qualification, extended temperature validation, or enhanced process traceability is mandatory. |
Compared with SMAJ45CA-M3/5A, the E3 variant offers identical protection performance at lower cost for non-automotive use, while the HM3_A/I adds AEC-Q101 validation and full automotive traceability - making SMAJ45CA-M3/5A the optimal balance of halogen-free compliance, industrial reliability, and broad supply chain availability.
Availability
SMAJ45CA-M3/5A is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O protection, and telecom line conditioning requiring stable component supply, halogen-free compliance, and long-term manufacturing continuity.
Supply support for SMAJ45CA-M3/5A 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, precision, and application-specific optimization.
The SMAJ series is engineered for high-reliability transient suppression in harsh environments - targeting automotive, industrial automation, and communications infrastructure where robustness against ESD, EFT, and lightning surges is mission-critical.
FAQ
What is the clamping voltage of SMAJ45CA-M3/5A at its rated peak pulse current?
The SMAJ45CA-M3/5A exhibits a maximum clamping voltage (VC) of 72.7 V at its specified peak pulse current (IPPM) of 5.5 A under a 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ45CA-M3/5A maintains this clamping performance across its full operating temperature range and lifetime, provided PCB layout follows recommended 0.2" × 0.2" copper pad guidelines.
Is SMAJ45CA-M3/5A suitable for automotive applications?
SMAJ45CA-M3/5A is halogen-free and RoHS-compliant but not inherently AEC-Q101 qualified - that qualification requires the HM3 suffix with revision code (e.g., SMAJ45CAHM3_A/I). However, the SMAJ45CA-M3/5A shares identical electrical characteristics, package, and thermal performance with its automotive-grade variants, making it suitable for non-safety-critical automotive subsystems where formal qualification is not mandated. For full AEC-Q101 compliance, specify SMAJ45CAHM3_A/I instead of SMAJ45CA-M3/5A.
How does the bidirectional nature of SMAJ45CA-M3/5A affect its PCB layout?
The SMAJ45CA-M3/5A has no polarity marking and functions identically in both directions, eliminating orientation constraints during placement. This simplifies PCB layout by removing the need for silkscreen polarity indicators or automated vision alignment checks. Engineers can place SMAJ45CA-M3/5A symmetrically across differential lines (e.g., RS-485 A/B) or single-ended signals without concern for anode/cathode assignment - reducing assembly errors and enabling compact, balanced protection schemes.
What is the thermal resistance of SMAJ45CA-M3/5A, and how does it impact surge handling?
The SMAJ45CA-M3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" copper pads per terminal. This value directly governs its ability to dissipate heat during repetitive surges: at 0.01 % duty cycle, the device remains within its 150 °C TJ limit. For higher repetition rates or elevated ambient temperatures, thermal derating per Fig. 2 must be applied - underscoring the importance of adequate copper area and airflow in high-duty-cycle applications using SMAJ45CA-M3/5A.
Does SMAJ45CA-M3/5A meet industry standards for ESD and surge immunity?
Yes - SMAJ45CA-M3/5A is characterized to meet IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT), and IEC 61000-4-5 (surge) test levels when implemented with proper PCB layout. Its sub-1 ps response time, low clamping voltage, and 400 W pulse rating enable protection up to ±25 kV contact ESD and 4 kV EFT bursts. While the device itself is not certified to UL 497B, it carries Underwriters Laboratory Recognition (QVGQ2) for protector classification - confirming its suitability for use in UL-listed equipment designs incorporating SMAJ45CA-M3/5A.
SMAJ45CA-M3/5A 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-M3/5A FAQ
1.How can I place an order for SMAJ45CA-M3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ45CA-M3/5A 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-M3/5A reliable?
The price and inventory of SMAJ45CA-M3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ45CA-M3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ45CA-M3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ45CA-M3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ45CA-M3/5A?
SMAJ45CA-M3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ45CA-M3/5A 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-M3/5A?
For technical support, including SMAJ45CA-M3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ45CA-M3/5A requirements.
6.How does Aetrix verify that SMAJ45CA-M3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ45CA-M3/5A 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-M3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ45CA-M3/5A?
All SMAJ45CA-M3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ45CA-M3/5A, 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-M3/5A part is unused and in its original packaging.
Return procedure for SMAJ45CA-M3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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