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Vishay General Semiconductor - Diodes Division SMCJ48CA-M3/9AT
- Part No.:
- SMCJ48CA-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ48CA-M3/9AT.pdf
- Description:
- TVS DIODE 48VWM 77.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,699
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Product details
Overview
SMCJ48CA-M3/9AT 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 48 V standoff voltage (VWM), 77.4 V maximum clamping voltage (VC) at 19.4 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM). It protects sensitive ICs, MOSFETs, and sensor signal lines against inductive switching transients and lightning-induced surges in automotive and industrial power rails.
For engineers reviewing the SMCJ48CA-M3/9AT datasheet, SMCJ48CA-M3/9AT pinout, SMCJ48CA-M3/9AT application, or SMCJ48CA-M3/9AT equivalent, key selection criteria include bidirectional clamping symmetry, low incremental surge resistance, AEC-Q101 qualification eligibility (via HM3 suffix), MSL Level 1 moisture sensitivity, and halogen-free RoHS compliance per Vishay's M3 grading.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 MΩ leakage at 48 V), then rapidly avalanches into low-impedance conduction when transient voltage exceeds its 53.3–58.9 V breakdown range (VBR at 1 mA). Its glass-passivated junction ensures stable, repeatable clamping performance across temperature (-55 °C to +150 °C).
The device uses a symmetrical bidirectional structure-no polarity marking-enabling AC-coupled or floating-line protection without orientation constraints. Its 10/1000 μs waveform response delivers sub-nanosecond turn-on and clamps transients within 40 ns, maintaining system-level ESD and surge immunity per IEC 61000-4-2/4-5 standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC working margin. |
| VBR min/max | 53.3 V / 58.9 V at 1 mA - Guaranteed breakdown onset range; ensures consistent trigger threshold across production lots. |
| VC @ IPPM | 77.4 V at 19.4 A - Clamped voltage during 1500 W transient; determines maximum stress imposed on protected downstream circuitry. |
| PPPM | 1500 W - Peak pulse power handling capability with 10/1000 μs waveform; defines single-event surge energy absorption limit. |
| ID @ VWM | 1.0 μA - Reverse leakage at rated standoff voltage; ensures minimal standby power loss and signal integrity in high-impedance nodes. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive and industrial environments. |
| Package | SMC (DO-214AB) - Standardized 2-pin surface-mount outline with 8.0 mm × 8.0 mm copper pad thermal footprint per JEDEC. |
Pinout & Package
SMCJ48CA-M3/9AT is housed in an SMC (DO-214AB) package: molded plastic case with matte tin-plated leads, UL 94 V-0 flammability rating, and no polarity marking due to bidirectional construction. Terminals are symmetric and non-polarized.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional avalanche junction | Either terminal serves as cathode or anode depending on transient polarity; enables AC line or floating-rail protection without orientation dependency. |
| Case (body) | Thermal and mechanical interface | Non-electrical; provides mechanical mounting and contributes to thermal dissipation via PCB copper pads (0.31" × 0.31" recommended). |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR and VC characteristics in both directions-eliminates need for polarity-aware layout in differential or AC-coupled signal paths. |
| Low clamping ratio (VC/VBR) | 1.45 typical (77.4 V / 53.3 V)-minimizes overvoltage exposure to protected ICs during surge events. |
| Halogen-free & RoHS-compliant (M3) | Meets IPC-1752A material declaration requirements and JESD201 Class 2 whisker resistance-suitable for green manufacturing and automotive supply chains. |
| MSL Level 1 rating | Unlimited floor life at ≤30 °C/85 % RH-enables standard SMT assembly without baking or dry-pack handling. |
| Fast response time | <40 ns turn-on delay-ensures protection activation prior to damage threshold of modern CMOS and SiC power devices. |
Applications
| Automotive Power Distribution | Industrial Sensor Signal Lines |
|---|---|
|
Use Scenario: Protection of 48 V battery rail inputs in ADAS ECUs and body control modules against load dump and jump-start transients. IC Role / Device Role / Timing Role: Shunt clamping TVS placed directly at connector entry point to divert >100 A surge currents away from DC-DC converters and microcontrollers. Use Value: Maintains 77.4 V clamping ceiling below 100 V absolute maximum ratings of common 48 V automotive PMICs and gate drivers. |
Use Scenario: Surge suppression on RS-485 or CAN FD bus lines in factory automation PLCs exposed to motor drive noise and ground bounce. IC Role / Device Role / Timing Role: Bidirectional voltage clamp across differential pair to suppress common-mode transients while preserving signal integrity up to 5 Mbps. Use Value: Sub-1.0 μA leakage at 48 V ensures minimal impact on bus biasing and failsafe termination networks. |
| Telecom DC Power Feeds | Consumer Appliance Motor Controls |
|
Use Scenario: Input-stage protection for PoE++ (IEEE 802.3bt Type 4) powered devices receiving up to 90 W over Category 6A cabling. IC Role / Device Role / Timing Role: Primary TVS on DC input rail to absorb induced surges from nearby AC mains or lightning coupling into Ethernet infrastructure. Use Value: 1500 W PPPM rating handles worst-case IEC 61000-4-5 Combination Wave (1.2/50 μs + 8/20 μs) surges without degradation. |
Use Scenario: Protection of half-bridge gate drivers in smart washing machine inverters subjected to back-EMF spikes during brushless motor commutation. IC Role / Device Role / Timing Role: Clamp placed across high-side and low-side driver supply rails to prevent latch-up or oxide rupture in level-shift circuits. Use Value: Glass-passivated junction ensures stable VBR over 1000+ surge cycles-critical for long-life appliance reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ48CA-E3/61T | Lower PPPM (400 W), SMA package (smaller thermal mass), higher RθJA (150 °C/W), same VWM/VC specs. | Restricted to lower-energy transients; unsuitable for automotive load dump or industrial 1500 W surge testing. | Select only for space-constrained consumer electronics where 400 W surge margin suffices. |
| SMCJ48CAHM3_A/I | Identical electrical specs and SMC package; adds AEC-Q101 qualification and 13" tape-and-reel packaging (I code). | Required for automotive OEM designs needing certified component traceability and extended temperature validation. | Choose when automotive qualification and full lifecycle documentation are mandatory-not just halogen-free compliance. |
Compared with SMCJ48CA-M3/9AT, SMAJ48CA-E3/61T trades surge capacity for board area, while SMCJ48CAHM3_A/I adds formal automotive qualification without altering clamping behavior-making the M3/9AT optimal for cost-sensitive industrial and telecom applications requiring halogen-free compliance but not AEC-Q101 certification.
Availability
SMCJ48CA-M3/9AT is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interfaces, telecom DC feeds, and consumer appliance motor controls requiring stable component supply with halogen-free RoHS compliance and MSL Level 1 handling.
Supply support for SMCJ48CA-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, TVS devices, and optoelectronics with emphasis on reliability, power efficiency, and automotive-grade qualification.
The SMCJ series was engineered for high-energy transient suppression in harsh environments-targeting automotive, industrial, and telecom systems where robustness against repetitive surges and long-term parametric stability are critical design requirements.
FAQ
What is the clamping voltage of SMCJ48CA-M3/9AT at its rated peak pulse current?
The SMCJ48CA-M3/9AT clamps to a maximum of 77.4 V when subjected to its specified 19.4 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is guaranteed across temperature and production lot, ensuring predictable overvoltage protection for downstream components such as 75 V-rated MOSFETs or 80 V-input DC-DC controllers. The clamping occurs within 40 ns of transient onset.
Is SMCJ48CA-M3/9AT suitable for automotive applications?
SMCJ48CA-M3/9AT meets halogen-free RoHS requirements and is MSL Level 1 compliant, but it is not AEC-Q101 qualified in this specific M3/9AT configuration. For automotive use, Vishay offers the SMCJ48CAHM3_A/I variant, which carries full AEC-Q101 qualification. Engineers must select SMCJ48CAHM3_A/I-not SMCJ48CA-M3/9AT-if OEM compliance documentation, extended temperature validation, or failure-in-time reporting is required.
How does the bidirectional nature of SMCJ48CA-M3/9AT affect PCB layout?
Because SMCJ48CA-M3/9AT is bidirectional, it has no polarity marking and can be mounted in either orientation on the PCB-simplifying layout and eliminating risk of reverse installation. This makes it ideal for protecting AC-coupled lines, differential buses like RS-485, or floating power domains where voltage polarity may reverse during fault conditions. No silkscreen polarity indicator is needed.
What thermal derating applies to SMCJ48CA-M3/9AT above 25 °C ambient?
SMCJ48CA-M3/9AT exhibits linear thermal derating above 25 °C ambient: its peak pulse power (PPPM) decreases by approximately 1.1 % per °C rise, based on a typical RθJA of 75 °C/W. At 85 °C ambient, its usable PPPM drops to ~890 W. Derating follows Figure 2 in Vishay document 88394 and assumes the recommended 0.31" × 0.31" copper pad layout per terminal for optimal heat dissipation.
Can SMCJ48CA-M3/9AT replace unidirectional SMCJ48A-M3/9AT in existing designs?
No-SMCJ48CA-M3/9AT cannot directly replace unidirectional SMCJ48A-M3/9AT without circuit review. While both share identical VWM (48 V), VBR, and VC specs, the unidirectional version requires correct cathode orientation and blocks forward current, whereas the CA variant conducts equally in both directions. Substitution may cause unintended conduction in DC-biased rails or violate bias network assumptions.
SMCJ48CA-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:
- -
- 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 (SMC)
SMCJ48CA-M3/9AT FAQ
1.How can I place an order for SMCJ48CA-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ48CA-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 SMCJ48CA-M3/9AT reliable?
The price and inventory of SMCJ48CA-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 SMCJ48CA-M3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ48CA-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ48CA-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ48CA-M3/9AT?
SMCJ48CA-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ48CA-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 SMCJ48CA-M3/9AT?
For technical support, including SMCJ48CA-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ48CA-M3/9AT requirements.
6.How does Aetrix verify that SMCJ48CA-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ48CA-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 SMCJ48CA-M3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ48CA-M3/9AT?
All SMCJ48CA-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ48CA-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 SMCJ48CA-M3/9AT part is unused and in its original packaging.
Return procedure for SMCJ48CA-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ48CA-M3/9AT Tags
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