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Vishay General Semiconductor - Diodes Division SMAJ45CA-M3/61
- Part No.:
- SMAJ45CA-M3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ45CA-M3/61.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,808
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Product details
Overview
SMAJ45CA-M3/61 from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal lines. It features a 45 V stand-off 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 (IPPM), and 400 W peak pulse power (10/1000 μs waveform), targeting protection of MOSFETs, ICs, and sensor interfaces in industrial and automotive systems.
For engineers reviewing the SMAJ45CA-M3/61 datasheet, SMAJ45CA-M3/61 pinout, SMAJ45CA-M3/61 application, or SMAJ45CA-M3/61 equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VWM ≈ 1.62), AEC-Q101 qualification eligibility (via HM3 suffix), MSL Level 1 moisture sensitivity, and halogen-free RoHS compliance per Vishay's M3 grade.
Technical Context
This device operates as a silicon avalanche diode with symmetrical bidirectional conduction-no polarity marking required-and delivers fast response time (<1 ps) to ESD and lightning-induced surges. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low incremental surge resistance, enabling consistent clamping performance across repetitive transients.
Thermal design relies on RθJA = 120 °C/W (on 0.2" × 0.2" copper pads) and RθJL = 30 °C/W, supporting operation from –55 °C to +150 °C junction temperature. Derating above 25 °C ambient follows Fig. 2, maintaining 400 W pulse rating up to ~78 V; above that, rated pulse power drops to 300 W per specification note (1).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 45 V - Maximum continuous reverse voltage before significant leakage; defines operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 50.0–55.3 V at 1 mA - Ensures reliable avalanche initiation within tight tolerance for predictable turn-on behavior. |
| VC (Clamping Voltage) | 72.7 V at IPPM = 5.5 A - Limits transient voltage seen by protected circuitry during 10/1000 μs surge events. |
| PPPM (Peak Pulse Power) | 400 W (≤78 V), 300 W (>78 V) - Sustains high-energy surges without failure under standard 10/1000 μs waveform. |
| ID (Max Reverse Leakage) | 1.0 μA at VWM - Minimizes standby power loss and avoids false triggering in low-power sensor lines. |
| TJ max. | +150 °C - Enables deployment in under-hood automotive and industrial environments with elevated ambient temperatures. |
| Package | SMA (DO-214AC) - Surface-mount footprint compatible with automated placement; 0.208" × 0.157" body size. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, compliant with J-STD-002 and JESD 22-B102 solderability standards. Bidirectional configuration has no polarity marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals function identically; conducts in either direction once VBR is exceeded - no cathode band marking. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns. |
| 400 W peak pulse power (10/1000 μs) | Handles IEC 61000-4-5 Level 4 surge currents (e.g., 5.5 A @ 72.7 V) without degradation. |
| Low clamping ratio (VC/VWM = 1.62) | Minimizes overvoltage stress on downstream ICs compared to higher-ratio TVS devices. |
| Halogen-free, RoHS-compliant (M3 grade) | Meets environmental compliance requirements for industrial and automotive supply chains. |
| MSL Level 1 (260 °C peak reflow) | Supports standard lead-free PCB assembly without pre-baking or special handling. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across differential or single-ended signal lines upstream of interface ICs. Use Value: Clamps transients to ≤72.7 V while maintaining <1.0 μA leakage at 45 V, preserving signal integrity and preventing latch-up in 5 V/3.3 V receivers. |
Use Scenario: Safeguarding digital input modules in programmable logic controllers against inductive switching spikes from solenoids and relays. IC Role / Device Role / Timing Role: Parallel-connected TVS on 24 V DC input rails to absorb 400 W surge energy without fuse activation. Use Value: Withstands repetitive 10/1000 μs surges at full rating due to low thermal resistance (RθJL = 30 °C/W), ensuring long-term reliability in factory automation. |
| Consumer Power Adapter Output | Telecom Line Interface |
|
Use Scenario: Secondary-side overvoltage suppression in AC/DC adapters powering USB-C PD or IoT hubs. IC Role / Device Role / Timing Role: Clamp placed between +VOUT and GND to limit output overshoot during regulation loop instability or capacitor failure. Use Value: 45 V VWM aligns with 5 V–20 V USB PD profiles; 72.7 V VC prevents damage to downstream USB controller ICs during 1 kV/0.5 Ω surge tests. |
Use Scenario: Primary protection for Ethernet PHY or DSL line drivers exposed to lightning-induced surges on twisted-pair cables. IC Role / Device Role / Timing Role: Differential-mode TVS pair (one per line) referenced to chassis ground, leveraging bidirectional symmetry. Use Value: Symmetrical VBR (50.0–55.3 V) ensures balanced clamping on both conductors, reducing common-mode noise injection into sensitive analog front-ends. |
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-E3/61 | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs. M3 grade). | Preferred for commercial-grade designs where halogen-free requirement is not mandated. | Select E3 for cost-sensitive non-automotive applications; M3 required for automotive OEM or green procurement policies. |
| SMBJ45CA-M3 | Same VWM/VBR/VC ratings but in larger SMB (DO-214AA) package; 600 W PPPM rating. | Better thermal performance (RθJA = 90 °C/W) and higher surge margin for high-reliability industrial use. | Choose SMBJ45CA-M3 when board space allows and >400 W surge immunity is needed; SMAJ45CA-M3/61 suits compact layouts. |
Compared with SMAJ45CA-E3/61, the M3 variant adds halogen-free compliance without sacrificing performance; versus SMBJ45CA-M3, it trades 200 W pulse headroom and thermal margin for 30% smaller footprint-critical for dense sensor node PCBs.
Availability
SMAJ45CA-M3/61 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and consumer power adapter outputs requiring stable component supply, halogen-free compliance, and AEC-Q101-qualified alternatives.
Supply support for SMAJ45CA-M3/61 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, and protection devices with emphasis on reliability, precision, and application-specific optimization.
The SMAJ series targets cost-effective, surface-mount transient suppression for high-volume industrial and automotive electronics, balancing robust surge handling with compact packaging and standardized qualification.
FAQ
What is the clamping voltage of SMAJ45CA-M3/61 at its rated peak pulse current?
The SMAJ45CA-M3/61 exhibits a maximum clamping voltage (VC) of 72.7 V when subjected to its rated peak pulse current (IPPM) of 5.5 A under the standard 10/1000 μs waveform. This value is measured per Figure 1 and Table on page 2 of Vishay document 88390, confirming consistent overvoltage limiting for protected circuits during surge events.
Is SMAJ45CA-M3/61 suitable for automotive applications?
Yes - SMAJ45CA-M3/61 uses the HM3 suffix variant for AEC-Q101 qualification (documented in Mechanical Data section), and its M3 grade meets halogen-free and RoHS requirements critical for automotive supply chains. While the base SMAJ45CA-M3/61 is commercial-grade, ordering code SMAJ45CAHM3_A/H enables direct AEC-Q101 compliance.
How does the bidirectional design of SMAJ45CA-M3/61 affect PCB layout?
The bidirectional design of SMAJ45CA-M3/61 eliminates polarity constraints: no cathode band marking exists, and either terminal may connect to line or ground. This simplifies layout for AC-coupled or floating interfaces (e.g., RS-485, CAN), removes orientation verification during assembly, and supports symmetric differential protection schemes without duplication.
What is the maximum reverse leakage current for SMAJ45CA-M3/61 at its stand-off voltage?
At its 45 V stand-off voltage (VWM), the SMAJ45CA-M3/61 specifies a maximum reverse leakage current (ID) of 1.0 μA at 25 °C, per Electrical Characteristics table on page 2 of Vishay document 88390. This low leakage preserves signal integrity and minimizes power loss in battery-powered or high-impedance sensor circuits.
Does SMAJ45CA-M3/61 require derating above ambient temperature?
Yes - SMAJ45CA-M3/61 must be derated above 25 °C ambient per Figure 2 in Vishay document 88390. Its peak pulse power decreases linearly from 400 W at 25 °C to zero at 150 °C junction temperature, with thermal resistance RθJA = 120 °C/W on recommended 0.2" × 0.2" copper pads. Designers must calculate actual TJ using PD = 3.3 W and ambient conditions.
SMAJ45CA-M3/61 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-M3/61 FAQ
1.How can I place an order for SMAJ45CA-M3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ45CA-M3/61 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-M3/61 reliable?
The price and inventory of SMAJ45CA-M3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ45CA-M3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ45CA-M3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ45CA-M3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ45CA-M3/61?
SMAJ45CA-M3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ45CA-M3/61 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-M3/61?
For technical support, including SMAJ45CA-M3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ45CA-M3/61 requirements.
6.How does Aetrix verify that SMAJ45CA-M3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ45CA-M3/61 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-M3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ45CA-M3/61?
All SMAJ45CA-M3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ45CA-M3/61, 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-M3/61 part is unused and in its original packaging.
Return procedure for SMAJ45CA-M3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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