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Vishay General Semiconductor - Diodes Division SMCJ48CA-E3/9AT
- Part No.:
- SMCJ48CA-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ48CA-E3/9AT.pdf
- Description:
- TVS DIODE 48VWM 77.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,471
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Product details
Overview
SMCJ48CA-E3/9AT from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection with 1500 W peak pulse power rating, 48 V standoff voltage (VWM), and 77.4 V maximum clamping voltage (VC) at 19.4 A peak pulse current (IPPM). It protects sensitive ICs and MOSFETs against inductive switching transients and lightning-induced surges in automotive and industrial power rails.
For engineers reviewing the SMCJ48CA-E3/9AT datasheet, SMCJ48CA-E3/9AT pinout, SMCJ48CA-E3/9AT application, or SMCJ48CA-E3/9AT equivalent, key selection criteria include bidirectional clamping symmetry, low incremental surge resistance, AEC-Q101 qualification eligibility (via HE3/HM3 variants), RoHS-compliant matte tin terminations, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
This TVS operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (<1 μA leakage at 48 V), but triggers into low-impedance conduction when transient voltage exceeds its 53.3–58.9 V breakdown range (VBR at 1 mA), limiting downstream voltage to ≤77.4 V. Its glass-passivated junction ensures stable avalanche characteristics and fast response time (<1 ns).
Thermally, it features RθJA = 75 °C/W and RθJL = 15 °C/W, enabling reliable operation up to TJ = +150 °C. The SMC (DO-214AB) package supports MSL Level 1 handling and 260 °C reflow peak temperature, with polarity-unmarked terminals for bidirectional use.
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 - Ensures consistent avalanche initiation across production lots |
| VC @ IPPM | 77.4 V at 19.4 A - Limits protected circuit voltage during 10/1000 μs surge events |
| PPPM | 1500 W - Peak pulse power handling per single transient event |
| ID @ VWM | 1.0 μA - Ultra-low leakage preserves signal integrity and battery life in standby |
| TJ max | +150 °C - Enables deployment in under-hood automotive and industrial environments |
| Package | SMC (DO-214AB) - Standardized 2-pin surface-mount outline with 7.75 mm × 6.22 mm footprint |
Pinout & Package
SMCJ48CA-E3/9AT uses a 2-terminal SMC (DO-214AB) package with no polarity marking for bidirectional operation. Terminals are matte tin-plated leads compatible with J-STD-002 soldering standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode | Bidirectional terminal pair | Either terminal serves as anode or cathode depending on transient polarity; no band marking required |
| Case | Non-conductive molding compound | UL 94 V-0 rated epoxy body provides electrical isolation and flame resistance |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures repeatable avalanche breakdown and long-term reliability under repetitive surge stress |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 7637-2 Pulse 1/2a) |
| MSL Level 1 rating | Enables direct placement without dry-pack or baking, reducing manufacturing overhead |
| RoHS-compliant E3 suffix | Meets commercial-grade environmental compliance with matte tin terminations |
| 1500 W 10/1000 μs rating | Provides robust protection against IEC 61000-4-5 Level 4 (4 kV line-to-line) surges |
Applications
| Automotive Power Distribution | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting 48 V battery-fed ECUs and body control modules from load dump and alternator transients. IC Role / Device Role / Timing Role: Bidirectional shunt clamp placed across power rail input prior to DC-DC converter. Use Value: Clamps 120 V load dump spikes to ≤77.4 V, preventing damage to downstream 65 V-rated regulators and microcontrollers. | Use Scenario: Safeguarding 24 V digital input channels in programmable logic controllers exposed to field wiring surges. IC Role / Device Role / Timing Role: Parallel-connected TVS on each isolated input channel, referenced to common ground. Use Value: Absorbs 1 kV/500 A IEC 61000-4-5 surges without degradation, maintaining signal integrity during factory automation operation. |
| Telecom DC Power Feeds | Consumer Appliance Motor Drivers |
Use Scenario: Shielding PoE-powered equipment front-end circuits from induced surges on long Ethernet runs. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 48 V DC feed before Ethernet PHY and controller. Use Value: Limits transient voltage to safe levels within 1 ns, preserving IEEE 802.3af/at compliance and avoiding latch-up. | Use Scenario: Suppressing back-EMF spikes from brushed DC motors in smart home appliances. IC Role / Device Role / Timing Role: Across-motor terminals to clamp inductive kickback during PWM commutation. Use Value: Handles 1500 W pulses without thermal runaway, extending MOSFET lifetime and eliminating audible coil whine. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ48CA-E3/61T | Lower PPPM (400 W), smaller SMA package, same VWM/VC specs | Limited to lower-energy transients; unsuitable for IEC 61000-4-5 Level 4 | Select when board space is constrained and surge threat level is ≤1 kV |
| SMCJ48CA-M3/9AT | Halogen-free variant; identical electrical and thermal specs | No functional difference; required only for halogen-free BOM compliance | Choose for green manufacturing programs without performance trade-offs |
Compared with SMCJ48CA-E3/9AT, SMAJ48CA-E3/61T offers reduced surge capacity in a smaller footprint, while SMCJ48CA-M3/9AT delivers identical protection with halogen-free materials-enabling compliance-driven substitution without redesign.
Availability
SMCJ48CA-E3/9AT is available at Aetrix Electronics and suitable for automotive power distribution, industrial PLC I/O protection, telecom DC power feeds, and consumer appliance motor drivers requiring stable component supply and full traceability.
Supply support for SMCJ48CA-E3/9AT 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 and application-specific optimization.
The SMCJ series targets high-energy transient suppression in harsh environments, engineered for automotive, industrial, and telecom systems where sustained surge immunity and AEC-Q101 readiness are critical design requirements.
FAQ
What is the clamping voltage of SMCJ48CA-E3/9AT at its rated peak pulse current?
The SMCJ48CA-E3/9AT has a maximum clamping voltage (VC) of 77.4 V when subjected to its rated peak pulse current (IPPM) of 19.4 A under a 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees that downstream components see no more than 77.4 V during standardized surge events, making SMCJ48CA-E3/9AT suitable for protecting 65 V-rated ICs in 48 V systems.
Is SMCJ48CA-E3/9AT suitable for automotive applications?
SMCJ48CA-E3/9AT itself is RoHS-compliant commercial-grade; however, the SMCJ48CA-HE3 variant (AEC-Q101 qualified) shares identical electrical specs and is designated for automotive use. Engineers selecting SMCJ48CA-E3/9AT for automotive designs must verify system-level qualification requirements-SMCJ48CA-E3/9AT may be used in non-safety-critical subsystems where full AEC-Q101 validation is not mandated.
How does the bidirectional configuration of SMCJ48CA-E3/9AT affect its PCB layout?
The bidirectional nature of SMCJ48CA-E3/9AT eliminates polarity marking-no cathode band is present, and either terminal functions identically under positive or negative transients. PCB layout requires symmetric 8.0 mm × 8.0 mm copper pads per terminal per Vishay's recommended mounting pad layout, with no orientation dependency, simplifying automated placement and reducing assembly errors.
What is the thermal resistance profile of SMCJ48CA-E3/9AT and how does it impact derating?
SMCJ48CA-E3/9AT has RθJA = 75 °C/W and RθJL = 15 °C/W. At TA = 25 °C, its 6.5 W steady-state power dissipation derates linearly above 25 °C per Figure 2 in the datasheet-reducing to ~4.5 W at 75 °C ambient. This defines usable continuous power in thermally constrained enclosures and informs heatsink requirements for high-duty-cycle surge environments.
Can SMCJ48CA-E3/9AT replace unidirectional TVS diodes like SMCJ48A-E3/9AT in existing designs?
No-SMCJ48CA-E3/9AT is bidirectional and lacks polarity marking, whereas SMCJ48A-E3/9AT is unidirectional with a cathode band. Substituting them requires verifying circuit topology: bidirectional use is mandatory for AC-coupled or dual-polarity rails; unidirectional parts are required where DC bias direction is fixed and reverse leakage must be minimized. Direct replacement without analysis risks improper clamping behavior.
SMCJ48CA-E3/9AT 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:
- -
- Bidirectional Channels:
- 1
- 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 (SMCJ)
SMCJ48CA-E3/9AT FAQ
1.How can I place an order for SMCJ48CA-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ48CA-E3/9AT 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 SMCJ48CA-E3/9AT reliable?
The price and inventory of SMCJ48CA-E3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ48CA-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ48CA-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ48CA-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ48CA-E3/9AT?
SMCJ48CA-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ48CA-E3/9AT 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 SMCJ48CA-E3/9AT?
For technical support, including SMCJ48CA-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ48CA-E3/9AT requirements.
6.How does Aetrix verify that SMCJ48CA-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ48CA-E3/9AT 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 SMCJ48CA-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ48CA-E3/9AT?
All SMCJ48CA-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ48CA-E3/9AT, 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 SMCJ48CA-E3/9AT part is unused and in its original packaging.
Return procedure for SMCJ48CA-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ48CA-E3/9AT Tags
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