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Vishay General Semiconductor - Diodes Division SMCJ48A-M3/9AT
- Part No.:
- SMCJ48A-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ48A-M3/9AT.pdf
- Description:
- TVS DIODE 48VWM 77.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,185
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Product details
Overview
SMCJ48A-M3/9AT from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMC (DO-214AB) 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 19.4 A peak pulse current (IPPM), and 1500 W peak pulse power rating with 10/1000 μs waveform.
For engineers reviewing the SMCJ48A-M3/9AT datasheet, SMCJ48A-M3/9AT pinout, SMCJ48A-M3/9AT application, or SMCJ48A-M3/9AT equivalent, key selection criteria include clamping performance under 19.4 A surge, thermal resistance (RθJA = 75 °C/W), halogen-free RoHS compliance (M3 suffix), and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
The SMCJ48A-M3/9AT operates as a silicon avalanche diode that enters breakdown when reverse voltage exceeds its VBR range (53.3–58.9 V), limiting transient energy by clamping to ≤77.4 V at 19.4 A. Its glass-passivated junction ensures stable leakage (<1.0 μA at 48 V) and fast response time (<1.0 ps), critical for protecting MOSFET gates and microcontroller I/O against ESD and inductive switching spikes.
Thermally, it supports operation from –55 °C to +150 °C junction temperature, with RθJL = 15 °C/W enabling effective heat transfer to PCB copper. The M3 suffix confirms halogen-free, RoHS-compliant construction meeting JESD201 Class 2 whisker resistance and J-STD-020 MSL Level 1 reflow profile (peak 260 °C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 48 V systems. |
| VBR min/max | 53.3 V / 58.9 V at 1 mA - Confirmed avalanche onset range; ensures predictable turn-on across production lot. |
| VC @ IPPM | 77.4 V at 19.4 A - Clamped voltage during 10/1000 μs surge; determines protected circuit's maximum stress level. |
| PPPM | 1500 W - Peak pulse power handling capability; validates protection against IEC 61000-4-5 Level 4 surges. |
| ID @ VWM | ≤1.0 μA - Reverse leakage at stand-off voltage; guarantees minimal standby power loss in battery-powered designs. |
| TJ max. | +150 °C - Maximum junction temperature; enables use in under-hood automotive or industrial enclosures. |
| RθJA | 75 °C/W - Thermal resistance junction-to-ambient on standard pad layout; informs derating above 25 °C ambient. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD22-B102. Polarity marked by cathode band; anode and cathode terminals are axially oriented along the body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground during overvoltage events. |
| Anode | Reference/return path | Typically tied to system ground or lower-potential rail; completes clamping current path. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power | Withstands high-energy transients such as ISO 7637-2 Load Dump pulses without degradation. |
| 77.4 V clamping at 19.4 A | Provides tight voltage limiting for 48 V automotive ECUs and industrial PLC I/O modules. |
| Halogen-free, RoHS-compliant (M3) | Meets environmental compliance requirements for global OEM supply chains and green manufacturing. |
| MSL Level 1, 260 °C peak reflow | Enables single-pass lead-free reflow assembly without moisture sensitivity concerns. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., relay coil flyback). |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 48 V battery management system (BMS) input stages from load dump and jump-start surges. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery+ and ground to clamp transients before they reach DC-DC converters and monitoring ICs. Use Value: Limits voltage to ≤77.4 V during 19.4 A surges, preventing damage to 65 V-rated MOSFETs and analog front-end amplifiers. | Use Scenario: Safeguarding RS-485 transceivers and analog sensor inputs in factory automation controllers. IC Role / Device Role / Timing Role: TVS mounted on differential bus lines and supply pins to absorb ESD (IEC 61000-4-2) and inductive coupling noise. Use Value: Sub-1.0 μA leakage at 48 V ensures no signal integrity impact on high-impedance sensor bridges or precision ADC references. |
| Telecom DC Power Input Protection | OBD-II Diagnostic Port Protection |
Use Scenario: Securing 48 V PoE-powered network switches and base station radios against lightning-induced surges. IC Role / Device Role / Timing Role: Primary clamping device on main DC input, coordinated with upstream fuses and secondary filtering. Use Value: 1500 W rating handles multi-kA induced surges per IEC 61000-4-5, while 75 °C/W RθJA allows thermal stability on standard PCB layouts. | Use Scenario: Hardening vehicle OBD-II connector pins against accidental 24 V/48 V battery misconnection and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS on VCC and data lines (CAN_H/CAN_L) to prevent latch-up in diagnostic tools and ECUs. Use Value: Fast avalanche response (<1 ps) suppresses sub-microsecond spikes before CAN transceivers enter fault mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ48A-M3/57T | Same VWM/VBR/VC specs but SMB (DO-214AA) package; 600 W PPPM rating vs. 1500 W. | Limited to lower-energy transients (e.g., ESD only); unsuitable for load dump or lightning surge. | Select only when board space is constrained and surge threat level is ≤600 W. |
| SMCJ48CA-M3/9AT | Bidirectional variant; identical VWM/VBR/VC but symmetric clamping in both polarities. | Required for AC-coupled or floating signal lines (e.g., Ethernet PHY, audio differential pairs). | Choose when protecting bidirectional interfaces where polarity reversal may occur. |
Compared with SMBJ48A-M3/57T and SMCJ48CA-M3/9AT, the SMCJ48A-M3/9AT delivers higher surge robustness in unidirectional DC applications while maintaining identical footprint compatibility within the SMC family-enabling scalable protection architecture without redesign.
Availability
SMCJ48A-M3/9AT is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and telecom DC input safeguarding requiring stable component supply and long-term lifecycle support.
Supply support for SMCJ48A-M3/9AT 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, thermal performance, and automotive qualification.
The SMCJ series is engineered for high-energy transient suppression in harsh environments-including automotive, industrial, and telecom-where consistent clamping, low leakage, and AEC-Q101 readiness (via HE3/HM3 variants) are mandatory.
FAQ
What is the clamping voltage of the SMCJ48A-M3/9AT under maximum rated surge current?
The SMCJ48A-M3/9AT clamps to a maximum of 77.4 V when subjected to its rated 19.4 A peak pulse current (IPPM) with a 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in Vishay's datasheet revision 09-Jan-2024. The clamping behavior ensures downstream components like 65 V-rated MOSFETs remain within safe operating limits during surge events. SMCJ48A-M3/9AT maintains this performance across its full operating temperature range (–55 °C to +150 °C).
Is the SMCJ48A-M3/9AT suitable for automotive applications?
Yes, the SMCJ48A-M3/9AT meets commercial-grade specifications and is part of the AEC-Q101-qualified SMCJ family-though the specific M3/9AT variant is not AEC-Q101 certified. For automotive use, engineers should select the HM3-suffixed version (e.g., SMCJ48A-HM3/9AT), which adds AEC-Q101 qualification while retaining identical electrical specs and SMC package. SMCJ48A-M3/9AT remains appropriate for non-safety-critical automotive subsystems where halogen-free RoHS compliance and 1500 W surge handling are primary requirements.
How does the M3 suffix affect the SMCJ48A-M3/9AT's compliance and assembly process?
The M3 suffix indicates halogen-free, RoHS-compliant construction with matte tin-plated leads qualified to JESD201 Class 2 whisker resistance and J-STD-020 MSL Level 1. This means SMCJ48A-M3/9AT supports lead-free reflow up to 260 °C peak without baking, eliminates brominated flame retardants, and complies with EU RoHS Directive 2011/65/EU Annex II. These attributes ensure compatibility with modern eco-conscious manufacturing lines and global export requirements. SMCJ48A-M3/9AT is supplied in 13″ tape-and-reel (9AT) packaging for high-volume SMT placement.
What is the thermal resistance and how does it impact PCB layout for the SMCJ48A-M3/9AT?
The SMCJ48A-M3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 0.31″ × 0.31″ (8.0 mm × 8.0 mm) copper pads per terminal, as specified in Vishay's datasheet. This value directly governs power derating: at 75 °C ambient, its 6.5 W steady-state dissipation drops to ~4.3 W. To maintain reliability, designers must allocate sufficient copper area and avoid thermal isolation. SMCJ48A-M3/9AT's RθJL of 15 °C/W further emphasizes the need for short, wide traces to thermal pads. No heatsink is required for transient-only operation.
Can the SMCJ48A-M3/9AT be used in bidirectional signal protection?
No-the SMCJ48A-M3/9AT is strictly unidirectional, with polarity indicated by a cathode band. Applying reverse bias beyond its 48 V stand-off voltage will cause conduction only in the forward direction of the internal diode structure. For bidirectional protection (e.g., RS-485, CAN, or AC-coupled lines), the SMCJ48CA-M3/9AT variant must be used. That part provides symmetrical clamping in both directions with identical VWM, VBR, and VC ratings. Using SMCJ48A-M3/9AT in bidirectional roles risks failure during negative transients, as it lacks reverse avalanche capability.
SMCJ48A-M3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- 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):
- 19.4A
- Power - Peak Pulse:
- 1500W (1.5kW)
- 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-214AB (SMC)
SMCJ48A-M3/9AT FAQ
1.How can I place an order for SMCJ48A-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ48A-M3/9AT 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 SMCJ48A-M3/9AT reliable?
The price and inventory of SMCJ48A-M3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ48A-M3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ48A-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ48A-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ48A-M3/9AT?
SMCJ48A-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ48A-M3/9AT 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 SMCJ48A-M3/9AT?
For technical support, including SMCJ48A-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ48A-M3/9AT requirements.
6.How does Aetrix verify that SMCJ48A-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ48A-M3/9AT 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 SMCJ48A-M3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ48A-M3/9AT?
All SMCJ48A-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ48A-M3/9AT, 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 SMCJ48A-M3/9AT part is unused and in its original packaging.
Return procedure for SMCJ48A-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ48A-M3/9AT Tags
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