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Vishay General Semiconductor - Diodes Division SMAJ48A-M3/61
- Part No.:
- SMAJ48A-M3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ48A-M3/61.pdf
- Description:
- TVS DIODE 48VWM 77.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,192
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Product details
Overview
SMAJ48A-M3/61 from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 48 V stand-off voltage (VWM), 53.3–58.9 V breakdown voltage (VBR) at 1 mA, 77.4 V maximum clamping voltage (VC) at 5.2 A peak pulse current (IPPM), and 400 W peak pulse power rating with 10/1000 μs waveform - suitable for protecting MOSFETs, ICs, and sensor interfaces against inductive switching transients and ESD in industrial and automotive electronics.
For engineers reviewing the SMAJ48A-M3/61 datasheet, SMAJ48A-M3/61 pinout, SMAJ48A-M3/61 application, or SMAJ48A-M3/61 equivalent, key selection criteria include clamping performance under 5.2 A surge, thermal resistance (RθJA = 120 °C/W), unidirectional polarity marking, halogen-free RoHS compliance (M3 suffix), and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
The SMAJ48A-M3/61 operates as a silicon avalanche diode that enters controlled breakdown above its VWM to clamp transient voltages within safe limits. Its glass-passivated junction ensures stable leakage (<1.0 μA at 48 V) and fast response time (<1.0 ps), enabling effective suppression of sub-microsecond transients induced by relay switching or lightning surges.
Rated for 150 °C maximum junction temperature and 40 A non-repetitive forward surge current (IFSM), it supports high-reliability operation in harsh environments. The device is MSL Level 1 compliant (reflow peak 260 °C) and qualified to AEC-Q101 when ordered with HE3/HM3 suffixes - though SMAJ48A-M3/61 itself is commercial-grade halogen-free.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 53.3 V / 58.9 V at 1 mA - guaranteed avalanche initiation range defining turn-on threshold |
| VC @ IPPM | 77.4 V at 5.2 A - clamped voltage during 10/1000 μs surge, limiting stress on downstream components |
| PPPM | 400 W - peak transient power handling capability under standard 10/1000 μs waveform |
| ID @ VWM | ≤1.0 μA - ultra-low reverse leakage preserves system efficiency and battery life in low-power circuits |
| RθJA | 120 °C/W - thermal resistance from junction to ambient, requiring adequate PCB copper area for sustained power dissipation |
| Polarity | Unidirectional - cathode marked by band; blocks reverse current until breakdown, conducts forward like rectifier |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile plastic case with matte tin-plated leads solderable per J-STD-002. Dimensions: 4.50 mm × 2.79 mm × 2.29 mm (L × W × H). Mounting requires 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal for rated power handling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path); carries surge current during clamping |
| Cathode | Reverse-biased terminal | Marked with band; connected to protected line (e.g., 48 V rail); avalanche breakdown occurs here during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power | Enables protection against IEC 61000-4-5 Level 3 (1 kV/2 Ω) surges without derating below 78 V |
| Low clamping ratio (VC/VBR ≈ 1.34) | Minimizes voltage overshoot during transients, reducing risk of latch-up or gate oxide damage in protected MOSFETs |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and single-reflow processing at 260 °C peak without baking |
| Halogen-free & RoHS-compliant (M3) | Meets environmental compliance requirements for industrial and consumer end equipment without compromising surge robustness |
| Fast response time (<1 ps) | Clamps transients faster than typical ESD events (e.g., HBM >200 V/ns), preventing propagation into sensitive circuitry |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of 48 V DC bus in BLDC motor controllers against back-EMF spikes during PWM switching. IC Role / Device Role / Timing Role: Unidirectional TVS placed across power rail to clamp inductive kickback before it reaches gate drivers or MCU power pins. Use Value: Limits transient voltage to ≤77.4 V, preventing overvoltage damage to 65 V-rated MOSFETs and maintaining functional safety integrity. |
Use Scenario: Surge suppression on LIN bus or sensor supply lines (e.g., ambient temperature sensors) exposed to load dump or jump-start conditions. IC Role / Device Role / Timing Role: Standoff-rated TVS absorbing 10/1000 μs transients up to 400 W while maintaining <1 μA leakage at 48 V nominal. Use Value: Ensures signal integrity and long-term reliability without loading the 12 V/48 V subsystem during quiescent operation. |
| Telecom Power Interfaces | Consumer IoT Hub Power Rails |
Use Scenario: Input protection for PoE-powered remote units where DC input may experience field-induced surges or hot-plug transients. IC Role / Device Role / Timing Role: Primary clamping device on 48 V input stage, coordinated with upstream fuse and common-mode choke. Use Value: Delivers predictable 77.4 V clamping with <1.0 μA leakage, preserving efficiency in always-on telecom equipment. |
Use Scenario: Overvoltage safeguard for USB-C PD-derived 48 V rails powering smart home hubs with integrated Zigbee/Z-Wave radios. IC Role / Device Role / Timing Role: Low-profile TVS mounted adjacent to DC-DC converter input to prevent transient coupling into RF sections. Use Value: SMA package enables dense layout; halogen-free (M3) compliance supports global CE/FCC certification requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ48A-E3/61 | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs M3) | Acceptable where halogen-free requirement is not mandated (e.g., non-EU commercial products) | Select E3 for cost-sensitive, non-automotive applications without halogen restrictions |
| SMAJ48CA-M3/61 | Bidirectional version; symmetric VBR (53.3–58.9 V) in both polarities; same VC and PPPM | Required for AC-coupled or dual-polarity signal lines (e.g., RS-485, CAN FD) where reverse polarity transients occur | Choose CA variant only if bidirectional clamping is needed; unidirectional SMAJ48A-M3/61 offers lower leakage in DC systems |
Compared with SMAJ48A-E3/61, the M3 suffix adds halogen-free compliance without performance trade-offs; versus SMAJ48CA-M3/61, the unidirectional configuration provides tighter leakage control (<1.0 μA vs 2× ID in bidirectional mode) for DC power rail protection.
Availability
SMAJ48A-M3/61 is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, telecom power interfaces, and consumer IoT hub power rails requiring stable component supply, halogen-free compliance, and repeatable 400 W transient suppression performance.
Supply support for SMAJ48A-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, power efficiency, and automotive qualification.
The SMAJ series is engineered for high-energy transient suppression in space-constrained SMT designs, targeting industrial automation, automotive electronics, and telecom infrastructure where consistent clamping and long-term stability are critical.
FAQ
What is the maximum clamping voltage of the SMAJ48A-M3/61 under standard surge conditions?
The SMAJ48A-M3/61 has a maximum clamping voltage (VC) of 77.4 V at 5.2 A peak pulse current (IPPM), measured with a 10/1000 μs waveform. This value defines the upper voltage limit imposed on protected circuitry during a standardized transient event, ensuring downstream components such as 65 V-rated MOSFETs remain within safe operating limits. The clamping performance is validated per ANSI/IEEE C62.35 and specified in Vishay's Document Number 88390.
Does the SMAJ48A-M3/61 meet automotive qualification standards?
The SMAJ48A-M3/61 is a commercial-grade halogen-free part and is not AEC-Q101 qualified. However, Vishay offers automotive variants under ordering codes SMAJ48AHE3_X or SMAJ48AHM3_X (with "_X" denoting revision letter), which carry full AEC-Q101 qualification. For automotive use, designers must specify the HE3 or HM3 suffix with appropriate revision code - SMAJ48A-M3/61 alone is intended for industrial and consumer applications.
How does the M3 suffix differ from E3 in the SMAJ48A-M3/61 part number?
The M3 suffix indicates halogen-free, RoHS-compliant construction, whereas E3 denotes RoHS-compliant but standard brominated flame-retardant molding compound. Both share identical electrical characteristics, thermal ratings, and packaging. The SMAJ48A-M3/61 meets IEC 61249-2-21 and JEDEC JS709B halogen-free definitions, making it suitable for environmentally regulated markets including EU WEEE and certain Tier 1 automotive supply chains requiring halogen-free materials.
What is the recommended PCB pad layout for optimal thermal and surge performance of the SMAJ48A-M3/61?
Vishay specifies a minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pad area per terminal for the SMAJ48A-M3/61 to achieve its rated 400 W peak pulse power. Smaller pads reduce heat dissipation and cause premature thermal runaway during repetitive surges. The device's RθJA of 120 °C/W assumes this layout; using internal copper planes or thermal vias beneath pads further improves sustained power handling in high-duty-cycle applications.
Can the SMAJ48A-M3/61 be used in bidirectional signal line protection?
No - the SMAJ48A-M3/61 is unidirectional and functions only in reverse-biased mode; applying significant reverse voltage beyond VWM triggers clamping, while forward bias allows conduction like a standard diode. For bidirectional protection (e.g., RS-485, CAN, or AC-coupled sensors), the SMAJ48CA-M3/61 variant must be used. Using SMAJ48A-M3/61 on bidirectional lines risks unintended forward conduction and failure to suppress negative-going transients.
SMAJ48A-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):
- 48V
- Voltage - Breakdown (Min):
- 53.3V
- Voltage - Clamping (Max) @ Ipp:
- 77.4V
- Current - Peak Pulse (10/1000µs):
- 5.2A
- 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)
SMAJ48A-M3/61 FAQ
1.How can I place an order for SMAJ48A-M3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ48A-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 SMAJ48A-M3/61 reliable?
The price and inventory of SMAJ48A-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 SMAJ48A-M3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ48A-M3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ48A-M3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ48A-M3/61?
SMAJ48A-M3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ48A-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 SMAJ48A-M3/61?
For technical support, including SMAJ48A-M3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ48A-M3/61 requirements.
6.How does Aetrix verify that SMAJ48A-M3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ48A-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 SMAJ48A-M3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ48A-M3/61?
All SMAJ48A-M3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ48A-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 SMAJ48A-M3/61 part is unused and in its original packaging.
Return procedure for SMAJ48A-M3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ48A-M3/61 Tags
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