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Vishay General Semiconductor - Diodes Division SMAJ45A-M3/61
- Part No.:
- SMAJ45A-M3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ45A-M3/61.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ45A-M3/61 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection in DC power rails and signal 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 modules, and DC-DC converter input stages.
For engineers reviewing the SMAJ45A-M3/61 datasheet, SMAJ45A-M3/61 pinout, SMAJ45A-M3/61 application, or SMAJ45A-M3/61 equivalent, key selection criteria include clamping performance under 5.5 A surge, thermal resistance (RθJA = 120 °C/W), halogen-free RoHS compliance (M3 suffix), SMA (DO-214AC) package compatibility, and AEC-Q101 qualification path via HM3 variant.
Technical Context
This TVS diode operates as a unidirectional shunt protector: reverse-biased during normal operation, it remains high-impedance until transient voltage exceeds VBR, then avalanches to clamp energy within VC. Its glass-passivated junction ensures stable breakdown and low leakage (<1.0 μA at 45 V).
Designed for automated SMT assembly on standard PCB pads (0.2" × 0.2"), it delivers fast response (<1 ns), low incremental surge resistance, and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. Thermal performance is defined by RθJL = 30 °C/W (junction-to-lead) and derates linearly above 25 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 45 V - Maximum continuous reverse operating voltage before conduction begins; defines safe DC rail margin. |
| VBR (Breakdown Voltage) | 50.0–55.3 V at 1.0 mA - Confirmed avalanche initiation range; ensures reliable triggering above system nominal voltage. |
| VC (Clamping Voltage) | 72.7 V at IPPM = 5.5 A - Maximum voltage seen by protected circuit during 10/1000 μs surge; critical for downstream IC survival. |
| PPPM (Peak Pulse Power) | 400 W - Energy-handling capacity for 10/1000 μs transients; sufficient for ISO 7637-2 Pulse 1/2a/5a in automotive 12 V systems. |
| ID (Reverse Leakage) | ≤1.0 μA at 45 V - Negligible standby current; avoids battery drain in always-on circuits. |
| TJ max. | 150 °C - Maximum junction temperature; supports operation in under-hood automotive or industrial enclosures. |
| Package | SMA (DO-214AC) - Industry-standard 2-pin SMD outline; 0.208" × 0.157" footprint with cathode band marking. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, molded plastic case with matte tin-plated leads. Cathode indicated by a single band on the body; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when voltage exceeds VBR. |
| Anode (unbanded end) | Reference / return path | Typically tied to system ground or lower-potential rail; completes clamping path during overvoltage event. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables protection against severe load-dump and inductive-switching transients in 12 V automotive systems without derating. |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets environmental compliance requirements for industrial and automotive OEMs without compromising surge robustness. |
| MSL Level 1, 260 °C peak reflow | Supports single-pass lead-free reflow assembly without moisture sensitivity concerns or pre-bake steps. |
| Low clamping ratio (VC/VBR ≈ 1.41) | Minimizes overvoltage stress on downstream components - critical for 48 V tolerant logic or analog front-ends. |
| Glass-passivated junction | Ensures long-term stability of VBR and low leakage across temperature and lifetime, even in humid environments. |
Applications
| Automotive Sensor Interface | Industrial PLC Digital Input |
|---|---|
|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor signal lines (e.g., pressure, temperature) from ESD and load-dump coupling in engine control units. IC Role / Device Role / Timing Role: Unidirectional shunt clamp placed between signal line and chassis ground, triggered within <1 ns of transient onset. Use Value: Limits induced voltage to ≤72.7 V during 5.5 A surge, preserving signal integrity and preventing latch-up in 5 V or 3.3 V interface ICs. |
Use Scenario: Safeguarding 24 V DC digital input channels in programmable logic controllers against field-wiring transients and relay coil flyback. IC Role / Device Role / Timing Role: Standoff-rated TVS mounted directly at connector entry point, clamping surges before reaching optocoupler or microcontroller GPIO. Use Value: Withstands repetitive 400 W pulses while maintaining <1 μA leakage at 24 V nominal, ensuring no false triggering during steady-state operation. |
| DC-DC Converter Input Stage | Telecom Power Supply Protection |
|
Use Scenario: Input-side surge suppression for isolated 12 V → 3.3 V buck converters powering FPGA or MCU subsystems in edge computing nodes. IC Role / Device Role / Timing Role: Primary overvoltage clamp upstream of input filter capacitor and controller IC, absorbing energy before regulation stage. Use Value: Clamps 10/1000 μs transients to 72.7 V, allowing use of 80 V rated input capacitors and reducing need for additional series impedance. |
Use Scenario: Secondary-side protection on -48 V telecom power distribution boards guarding backplane interface ICs from hot-swap and lightning-induced surges. IC Role / Device Role / Timing Role: Unidirectional TVS referenced to negative rail, conducting surge current into common ground plane during positive-going transients. Use Value: 150 °C max junction temperature rating enables reliable operation in sealed, convection-limited telecom chassis up to 85 °C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ45A-E3/61 | Same electrical specs; RoHS-compliant but contains brominated flame retardants (non-halogen-free). | Acceptable for commercial-grade industrial designs where halogen-free mandate does not apply. | Select E3 if halogen content is unrestricted and cost optimization is prioritized over green compliance. |
| SMAJ45AHM3_A/H | Identical electrical and mechanical specs; adds AEC-Q101 qualification and enhanced reliability screening. | Required for automotive ECUs, ADAS sensors, or any application demanding automotive-grade qualification. | Choose HM3 variant when automotive qualification, extended temperature validation, or zero-defect screening is contractually mandated. |
Compared with SMAJ45A-M3/61, the E3 version offers identical protection performance without halogen-free assurance, while the HM3 variant adds automotive qualification at higher cost - enabling precise alignment with commercial, industrial, or automotive program requirements.
Availability
SMAJ45A-M3/61 is available at Aetrix Electronics and suitable for automotive sensor protection, industrial PLC inputs, and DC-DC converter input staging requiring stable component supply, halogen-free compliance, and surface-mount manufacturability.
Supply support for SMAJ45A-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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series targets board-level transient protection in harsh environments - engineered for high-energy clamping, low leakage, and seamless SMT integration across automotive, industrial, and telecom infrastructure.
FAQ
What is the clamping voltage of SMAJ45A-M3/61 at its rated peak pulse current?
The SMAJ45A-M3/61 has a maximum clamping voltage (VC) of 72.7 V at 5.5 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured per JEDEC test conditions and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream ICs remain within absolute maximum ratings. The SMAJ45A-M3/61 maintains this clamping performance across its qualified operating temperature range.
Is SMAJ45A-M3/61 suitable for automotive applications?
The SMAJ45A-M3/61 itself is commercial-grade and halogen-free RoHS-compliant, but not AEC-Q101 qualified. For automotive use, Vishay offers the SMAJ45AHM3_A/H variant - identical in all electrical and mechanical parameters but with full AEC-Q101 qualification, enhanced screening, and automotive traceability. Engineers must specify the HM3 suffix for automotive programs; SMAJ45A-M3/61 is appropriate for non-automotive industrial or telecom applications requiring halogen-free compliance.
What does the "M3" suffix mean in SMAJ45A-M3/61?
The "M3" suffix in SMAJ45A-M3/61 indicates halogen-free, RoHS-compliant construction meeting IEC 61249-2-21 requirements, with no brominated or chlorinated flame retardants in the molding compound. It also denotes matte tin-plated leads compliant with J-STD-002 and JESD 22-B102, and whisker resistance per JESD 201 Class 2. This distinguishes it from the E3 suffix (RoHS-compliant but not halogen-free) and HE3/HM3 variants (AEC-Q101 qualified).
How does SMAJ45A-M3/61 compare to SMAJ43A-M3/61 in terms of voltage ratings?
SMAJ45A-M3/61 has a 45 V standoff voltage (VWM) and 50.0–55.3 V breakdown range (VBR), whereas SMAJ43A-M3/61 specifies 43 V VWM and 47.8–52.8 V VBR. The 2 V higher VWM of SMAJ45A-M3/61 provides greater margin against normal operating voltage fluctuations in 48 V nominal systems, while its slightly higher clamping voltage (72.7 V vs. 69.4 V) reflects the trade-off for improved standoff. Selection depends on system voltage tolerance and required clamping headroom - SMAJ45A-M3/61 suits tighter-tolerance 48 V rails.
What is the thermal resistance of SMAJ45A-M3/61, and how does it affect layout?
SMAJ45A-M3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on minimum recommended 0.2" × 0.2" copper pads per terminal. Its junction-to-lead resistance (RθJL) is 30 °C/W. To maintain TJ ≤ 150 °C under worst-case 3.3 W steady-state dissipation, PCB layout must provide adequate copper area and avoid thermal bottlenecks - especially important in enclosed industrial enclosures. Derating curves in the datasheet guide power handling above 25 °C ambient.
SMAJ45A-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:
- 1
- Bidirectional Channels:
- -
- 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)
SMAJ45A-M3/61 FAQ
1.How can I place an order for SMAJ45A-M3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ45A-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 SMAJ45A-M3/61 reliable?
The price and inventory of SMAJ45A-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 SMAJ45A-M3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ45A-M3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ45A-M3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ45A-M3/61?
SMAJ45A-M3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ45A-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 SMAJ45A-M3/61?
For technical support, including SMAJ45A-M3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ45A-M3/61 requirements.
6.How does Aetrix verify that SMAJ45A-M3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ45A-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 SMAJ45A-M3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ45A-M3/61?
All SMAJ45A-M3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ45A-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 SMAJ45A-M3/61 part is unused and in its original packaging.
Return procedure for SMAJ45A-M3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ45A-M3/61 Tags
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